v6.1

fix #146
2018-09-19 12:14:16 +08:00 · 2018-09-19 11:51:01 +08:00 · 2018-09-19 11:34:34 +08:00 · 2018-09-18 16:14:06 +08:00 · 2018-09-18 16:08:59 +08:00 · 2018-09-18 15:36:10 +08:00
83 changed files with 10326 additions and 1905 deletions
--- a/AUTHORIZATION.md
+++ b/AUTHORIZATION.md
@ -0,0 +1,13 @@
+# GoProxy特殊授权
+
+1.goproxy采用GPLv3源代码开放协议,未经许可,基于本项目开发的软件,衍生软件,相关软件,必须严格遵守GPLv3,否则一经发现,
+将严厉追责.
+
+2.如果公司或个人使用本项目代码开发相关软件,衍生软件,又不想遵守GPLv3协议,需要取得作者的"GoProxy特殊授权"书面授权.
+
+3.如果本页面查询不到"GoProxy特殊授权"书面授权信息,则"GoProxy特殊授权"书面授权无效.
+
+4.下面列出了有效的授权编号和有效期.
+
+授权编号 | 授权有效期
+:--- | :---
--- a/47
+++ b/47
@ -1,4 +1,51 @@
 proxy更新日志
+
+v6.1
+1.黑白名单支持设置顶级域了,比如:com,匹配所有的.com域名
+2.优化TCPS内存释放.
+3.优化了域名检查.
+4.内网穿透增加了TCPS和TOU协议,
+  TCPS提供了多种自定义加密TCP方式传输.
+  TOU提供了TCP over UDP,多种自定义加密UDP方式传输TCP数据.
+5.优化了DST,防止意外crash.
+6.修复了mapx的Keys()方法的bug导致内网穿透bridge不稳定的问题.
+7.修复了部分服务不能绑定IPv6地址的bug.
+
+v6.0 企业版开源啦
+本次更新主要是把企业版开源,把企业版代码合并到现在的开源goproxy当中,继续遵循GPLv3,免费开源,
+之所以直接跳过5.x,用6.0版本号是为了与现有开源版本做一个明显的区分,下面功能主要来自企业版.
+企业版代码结构更合理,核心与开源版本有很大区别,与此同时企业版有一个core开发库,基于此库可以
+几行代码实现自己高度定制化的各种网络安全传输服务器和客户端和代理服务器与客户端.与此同时企
+业版独创了TCPS协议,处于应用层和TCP层之间,可以为应用提供透明化的安全传输功能,另外还对dst协
+议进行了一些改造,集成到goproxy中,实现了tcp over udp功能,那么除了kcp之外现在还可以选择dst
+作为底层的tcp over udp的传输.下一步加入插件机制,定制功能可以使用插件方式开发了，热插拔，
+不需要修改goproxy二进制，可以插件so或者dylib注入.
+
+1.预编译的二进制增加了armv8支持.
+2.预编译的mipsle和mips二进制增加了softfloat支持.
+3.优化连接HTTP(s)上级代理的CONNECT指令,附带更多的信息.
+4.重构了内网穿透的UDP功能,性能大幅度提升,可以愉快的与异地基友玩依赖UDP的局域网游戏了.
+5.重构了UDP端口映射,性能大幅度提升.
+6.HTTP(S)\SOCKS5\SPS代理支持上级负载均衡,可以同时指定多个上级.
+7.SPS支持HTTP(S)\SOCKS5\SS协议相互转换.
+8.HTTP(S)\SOCKS5\SPS代理支持限速.
+9.HTTP(S)\SOCKS5代理支持指定出口IP.
+10.SOCKS5代理支持级联认证.
+11.修复了tclient可能意外退出的bug.
+12.优化了错误捕获,防止意外crash.
+13.优化了停止服务,释放内存.
+
+v5.4
+1.优化了获取本地IP信息导致CPU过高的问题.
+2.所有服务都增加了--nolog参数,可以关闭日志输出,节省CPU.
+3.优化sdk,支持并发启动/关闭操作.
+4.修复了多连接版本的内网穿透,tserver连接不能正确释放的bug.
+5.内网穿透增加了client/tclient和server/tserver使用代理连接bridge/tbridge的功能,详细内容参考手册.
+6.TCP端口映射(TCP代理)增加了使用代理连接上级的功能,详细内容参考手册.
+
+v5.3
+1.优化了socks_client握手端口判断,避免了sstap测试UDP失败的问题.
+
 v5.2
 1.修复了HTTP(S)\SPS反向代理无法正常工作的问题.
 2.优化了智能判断,减少不必要的DNS解析.
--- a/89
+++ b/89
@ -1,9 +1,82 @@
-FROM golang:1.10.3-alpine as builder
+FROM alpine:3.7 AS builder
+
+RUN apk add --no-cache \
+		ca-certificates
+
+# set up nsswitch.conf for Go's "netgo" implementation
+# - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
+# - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
+RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
+
+ENV GOLANG_VERSION 1.10.3
+
+# make-sure-R0-is-zero-before-main-on-ppc64le.patch: https://github.com/golang/go/commit/9aea0e89b6df032c29d0add8d69ba2c95f1106d9 (Go 1.9)
+#COPY *.patch /go-alpine-patches/
+
+RUN set -eux; \
+	apk add --no-cache --virtual .build-deps \
+		bash \
+		gcc \
+		musl-dev \
+		openssl \
+		go \
+	; \
+	export \
+# set GOROOT_BOOTSTRAP such that we can actually build Go
+		GOROOT_BOOTSTRAP="$(go env GOROOT)" \
+# ... and set "cross-building" related vars to the installed system's values so that we create a build targeting the proper arch
+# (for example, if our build host is GOARCH=amd64, but our build env/image is GOARCH=386, our build needs GOARCH=386)
+		GOOS="$(go env GOOS)" \
+		GOARCH="$(go env GOARCH)" \
+		GOHOSTOS="$(go env GOHOSTOS)" \
+		GOHOSTARCH="$(go env GOHOSTARCH)" \
+	; \
+# also explicitly set GO386 and GOARM if appropriate
+# https://github.com/docker-library/golang/issues/184
+	apkArch="$(apk --print-arch)"; \
+	case "$apkArch" in \
+		armhf) export GOARM='6' ;; \
+		x86) export GO386='387' ;; \
+	esac; \
+	\
+	wget -O go.tgz "https://golang.org/dl/go$GOLANG_VERSION.src.tar.gz"; \
+	echo '567b1cc66c9704d1c019c50bef946272e911ec6baf244310f87f4e678be155f2 *go.tgz' | sha256sum -c -; \
+	tar -C /usr/local -xzf go.tgz; \
+	rm go.tgz; \
+	\
+	cd /usr/local/go/src; \
+	for p in /go-alpine-patches/*.patch; do \
+		[ -f "$p" ] || continue; \
+		patch -p2 -i "$p"; \
+	done; \
+	./make.bash; \
+	\
+	rm -rf /go-alpine-patches; \
+	apk del .build-deps; \
+	\
+	export PATH="/usr/local/go/bin:$PATH"; \
+	go version
+
+ENV GOPATH /go
+ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
+
+RUN mkdir -p "$GOPATH/src" "$GOPATH/bin" && chmod -R 777 "$GOPATH"
+WORKDIR $GOPATH
+
 ARG GOPROXY_VERSION=master
-RUN apk update && apk upgrade && \
-    apk add --no-cache git && cd /go/src/ && git clone https://github.com/snail007/goproxy && \
-	cd goproxy && git checkout ${GOPROXY_VERSION} && \
-    go get && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o proxy
-FROM alpine:3.7
-COPY --from=builder /go/src/goproxy/proxy /
-CMD /proxy ${OPTS}
+RUN apk update; apk upgrade; \
+    apk add --no-cache git; \
+    cd /go/src/; \
+    mkdir github.com; \
+    mkdir github.com/snail007; \
+    cd github.com/snail007; \
+    git clone https://github.com/snail007/goproxy.git; \
+	cd goproxy; \
+    git checkout ${GOPROXY_VERSION}; \
+    CGO_ENABLED=0 GOOS=linux go build -ldflags "-s -w" -a -installsuffix cgo -o proxy; \
+    chmod 0777 proxy
+    
+FROM 1.10.3-stretch 
+RUN mkdir /proxy && chmod 0777 /proxy
+COPY --from=builder builder /go/src/github.com/snail007/goproxy/proxy /proxy/
+CMD cd /proxy  && /proxy ${OPTS}
--- a/README.md
+++ b/README.md
@ -1,5 +1,5 @@
 <img src="https://github.com/snail007/goproxy/blob/master/docs/images/logo.jpg?raw=true" width="200"/>
-Proxy is a high performance HTTP, HTTPS, HTTPS, websocket, TCP, UDP, Socks5 proxy server implemented by golang. It supports parent proxy,nat forward,TCP/UDP port forwarding, SSH transfer, TLS encrypted transmission, protocol conversion. you can expose a local server behind a NAT or firewall to the internet, secure DNS proxy.  
+Proxy is a high performance HTTP, HTTPS, HTTPS, websocket, TCP, UDP, Socks5, ss proxy server implemented by golang. It supports parent proxy,nat forward,TCP/UDP port forwarding, SSH transfer, TLS encrypted transmission, protocol conversion. you can expose a local server behind a NAT or firewall to the internet, secure DNS proxy.  

  
 ---  
@ -12,6 +12,8 @@ Proxy is a high performance HTTP, HTTPS, HTTPS, websocket, TCP, UDP, Socks5 prox

 **[全平台SDK](/sdk/README.md)**

+**[GoProxy特殊授权](/AUTHORIZATION.md)**
+
 ### How to contribute to the code (Pull Request)?  

 Pull Request is welcomed.   
@ -33,10 +35,15 @@ PR needs to explain what changes have been made and why you change them.
 - The integrated external API, HTTP (S): SOCKS5 proxy authentication can be integrated with the external HTTP API, which can easily control the user's access through the external system.  
 - Reverse proxy: goproxy supports directly parsing the domain to proxy monitor IP, and then proxy will help you to access the HTTP (S) site that you need to access.
 - Transparent proxy: with the iptables, goproxy can directly forward the 80 and 443 port's traffic to proxy in the gateway, and can realize the unaware intelligent router proxy.  
- Protocol conversion: The existing HTTP (S) or SOCKS5 proxy can be converted to a proxy which support both HTTP (S) and SOCKS5 by one port, but the converted SOCKS5 proxy does not support the UDP function.Also support powerful cascading authentication.  
+- Protocol conversion: The existing HTTP (S) or SOCKS5 or ss proxy can be converted to a proxy which support HTTP (S), SOCKS5 and ss by one port, if the converted SOCKS5 and ss proxy's parent proxy is SOCKS5, which can support the UDP function.Also support powerful cascading authentication.  
 - Custom underlying encrypted transmission, HTTP(s)\sps\socks proxy can encrypt TCP data through TLS standard encryption and KCP protocol encryption. In addition, it also supports custom encryption after TLS and KCP. That is to say, custom encryption and tls|kcp can be used together. The internal uses AES256 encryption, and it only needs to define one password by yourself when is used.   
 - Low level compression and efficient transmission，The HTTP(s)\sps\socks proxy can encrypt TCP data through a custom encryption and TLS standard encryption and KCP protocol encryption, and can also compress the data after encryption. That is to say, the compression and custom encryption and tls|kcp can be used together.
 - The secure DNS proxy, Through the DNS proxy provided by the local proxy, you can encrypted communicate with the father proxy to realize the DNS query of security and pollution prevention.
+- Load balance,High availability,HTTP(S)\SOCKS5\SPS proxy support Superior load balance and high availability. Multiple superiors repeat -P parameters.
+- Designated exporting IP,HTTP(S)\SOCKS5\SPS proxy supports the client to connect with the entry IP,Using the entry IP as the  exporting IP to visit the target website。If the entry IP is the intranet IP，Exporting IP will not use entry IP
+- Support speed limit. HTTP (S) \SOCKS5\SPS proxy supports speed limit.
+- SOCKS5 proxy supports cascade authentication.
+- Certificate parameters use base64 data. By default, the - C, - K parameters are the path of the CRT certificate and key file. If “base64://” begins, the subsequent data is thought to be Base64 encoded which will be decoded and used.
  
 ### Why need these?  
 - Because for some reason, we cannot access our services elsewhere. We can build a secure tunnel to access our services through multiple connected proxy nodes.  
@ -48,7 +55,8 @@ PR needs to explain what changes have been made and why you change them.
 - ...  

 
-This page is the v5.2 manual, and the other version of the manual can be checked by the following [link](docs/old-release.md).  
+This page is the v6.0 manual, and the other version of the manual can be checked by the following [link](docs/old-release.md).  
+

 ### How to find the organization?  
 [Click to join the proxy group of gitter](https://gitter.im/go-proxy/Lobby?utm_source=share-link&utm_medium=link&utm_campaign=share-link)  
@ -71,6 +79,7 @@ This page is the v5.2 manual, and the other version of the manual can be checked
 - [Safety advice](#safety-advice)

 ### Manual catalogues
+- [Load balance and high available](#load-balance-and-high-available)
 - [1.HTTP proxy](#1http-proxy)
    - [1.1 Common HTTP proxy](#11common-http-proxy)
    - [1.2 Common HTTP second level proxy](#12common-http-second-level-proxy)
@ -87,14 +96,19 @@ This page is the v5.2 manual, and the other version of the manual can be checked
    - [1.11 Custom DNS](#111custom-dns)
    - [1.12 Custom encryption](#112-custom-encryption)
    - [1.13 Compressed transmission](#113-compressed-transmission)
-    - [1.14 View help](#114view-help)
+    - [1.14 load balance](#114-load-balance)
+    - [1.15 speed limit](#115-speed-limit)
+    - [1.16 Designated exporting IP](#116-designated-export-ip)
+    - [1.17 Certificate parameters using Base64 data](#117-certificate-parameters-using-Base64-data)
+    - [1.18 View help](#118view-help)
 - [2.TCP proxy](#2tcp-proxy)
    - [2.1 Common TCP first level proxy](#21common-tcp-first-level-proxy)
    - [2.2 Common TCP second level proxy](#22common-tcp-second-level-proxy)
    - [2.3 Common TCP third level proxy](#23common-tcp-third-level-proxy)
    - [2.4 TCP second level encrypted proxy](#24tcp-second-level-encrypted-proxy)
    - [2.5 TCP third level encrypted proxy](#25tcp-third-level-encrypted-proxy)
-    - [2.6 View help](#26view-help)
+    - [2.6 Connect parents proxy through other proxy](#26connect-parents-proxy-through-other-proxy)
+    - [2.7 View help](#27view-help)
 - [3.UDP proxy](#3udp-proxy)
    - [3.1 Common UDP first level proxy](#31common-udp-first-level-proxy)
    - [3.2 Common UDP second level proxy](#32common-udp-second-level-proxy)
@ -110,7 +124,8 @@ This page is the v5.2 manual, and the other version of the manual can be checked
    - [4.5 Advanced usage 1](#45advanced-usage-1)
    - [4.6 Advanced usage 2](#46advanced-usage-2)
    - [4.7 -r parameters of server](#47-r-parameters-of-server)
-    - [4.8 View help](#48view-help)
+    - [4.8 Server and client connect bridge through proxy](#48server-and-client-connect-bridge-through-proxy)
+    - [4.9 View help](#49view-help)
 - [5.SOCKS5 proxy](#5socks5-proxy)
    - [5.1 Common SOCKS5 proxy](#51common-socks5-proxy)
    - [5.2 Common SOCKS5 second level proxy](#52common-socks5-second-level-proxy)
@ -125,17 +140,27 @@ This page is the v5.2 manual, and the other version of the manual can be checked
    - [5.9 Custom DNS](#59custom-dns)
    - [5.10 Custom encryption](#510custom-encryption)
    - [5.11 Compressed transmission](#511compressed-transmission)
-    - [5.12 View help](#512view-help)
+    - [5.12 load balance](#512-load-balance)
+    - [5.13 speed limit](#513-speed-limit)
+    - [5.14 Designated exporting IP](#514-designated-exporting-ip)
+    - [5.15 Cascade authentication](#515-cascade-authentication)
+    - [5.16 Certificate parameters using Base64 data](#516-certificate-parameters-using-base64-data)
+    - [5.17 View help](#517view-help)
 - [6.Proxy protocol conversion](#6proxy-protocol-conversion)
    - [6.1 Functional introduction](#61functional-introduction)
    - [6.2 HTTP(S) to HTTP(S) + SOCKS5](#62http-to-http-socks5)
    - [6.3 SOCKS5 to HTTP(S) + SOCKS5](#63socks5-to-http-socks5)
-    - [6.4 Chain style connection](#64chain-style-connection)
-    - [6.5 Listening on multiple ports](#65listening-on-multiple-ports)
-    - [6.6 Authentication](#66authentication)
-    - [6.7 Custom encryption](#67-custom-encryption)
-    - [6.8 Compressed transmission](#68-compressed-transmission)
-    - [6.9 View Help](#69view-help)
+    - [6.4 SS to HTTP(S)+SOCKS5+SS](#64-ss-to-httpssocks5ss)
+    - [6.5 Chain style connection](#65chain-style-connection)
+    - [6.6 Listening on multiple ports](#66listening-on-multiple-ports)
+    - [6.7 Authentication](#67authentication)
+    - [6.8 Custom encryption](#68-custom-encryption)
+    - [6.9 Compressed transmission](#69-compressed-transmission)
+    - [6.10 Disable-protocol](#610-disable-protocol)
+    - [6.11 speed limit](#611-speed-limit)
+    - [6.12 Designated exporting IP](#612-designated-exporting-ip)
+    - [6.13 Certificate parameters using Base64 data](#613-certificate-parameters-using-base64-data)
+    - [6.14 View Help](#614view-help)
 - [7.KCP Configuration](#7kcp-configuration)
    - [7.1 Configuration introduction](#71configuration-introduction)
    - [7.2 Configuration details](#72configuration-details)
@ -152,7 +177,7 @@ tips:all operations require root permissions.
 ```shell  
 curl -L https://raw.githubusercontent.com/snail007/goproxy/master/install_auto.sh | bash  
 ```  
-The installation is completed, the configuration directory is /etc/proxy, more detailed use of the method referred to the following manual for further understanding.  
+The installation is completed, the configuration directory is /etc/proxy, For more detailed usage, please refer to the manual above to further understand the functions you want to use.  
 If the installation fails or your VPS is not a linux64 system, please follow the semi-automatic step below:  
  
 #### Manual installation 
@ -161,7 +186,8 @@ If the installation fails or your VPS is not a linux64 system, please follow the
 Download address: https://github.com/snail007/goproxy/releases  
 ```shell  
 cd /root/proxy/  
-wget https://github.com/snail007/goproxy/releases/download/v5.0/proxy-linux-amd64.tar.gz  
+wget https://github.com/snail007/goproxy/releases/download/v6.0/proxy-linux-amd64.tar.gz  
+
 ```  
 #### **2.Download the automatic installation script**  
 ```shell  
@ -173,12 +199,12 @@ chmod +x install.sh

 #### Docker installation 

-Dockerfile root of project uses multistage build and alpine project to comply with best practices. Uses golang 1.10.3 for building as noted in the project README.md and will be pretty small image. total extracted size will be 17.3MB for goproxy version 5.0.
+Dockerfile root of project uses multistage build and alpine project to comply with best practices. Uses golang 1.10.3 for building as noted in the project README.md and will be pretty small image. total extracted size will be 17.3MB for goproxy latest version.

-The default build process builds the master branch (latest commits/ cutting edge), and it can be configured to build specific version, just edit Dockerfile before build, following builds release version 4.7:
+The default build process builds the master branch (latest commits/ cutting edge), and it can be configured to build specific version, just edit Dockerfile before build, following builds release version 6.0:

 ```
-ARG GOPROXY_VERSION=v5.0
+ARG GOPROXY_VERSION=v6.0
 ```

 To Run:
@ -188,12 +214,12 @@ sudo docker build .
 ```
 2. Tag the image:
 ```
-sudo docker tag <id from previous step>  goproxy/goproxy:latest
+sudo docker tag <id from previous step>  snail007/goproxy:latest
 ```
 3. Run! 
 Just put your arguments to proxy binary in the OPTS environmental variable (this is just a sample http proxy):
 ```
-sudo docker run -d --restart=always --name goproxy -e OPTS="http -p :33080" -p 33080:33080 goproxy/goproxy:latest
+sudo docker run -d --restart=always --name goproxy -e OPTS="http -p :33080" -p 33080:33080 snail007/goproxy:latest
 ```
 4. View logs:
 ```
@ -257,6 +283,20 @@ When vps is behind the NAT, the network card IP on VPS is an internal network IP
 Assuming that your VPS outer external network IP is 23.23.23.23, the following command sets the 23.23.23.23 through the -g parameter.  
 `./proxy http -g "23.23.23.23"`  

+### **Load balance and high available**
+HTTP(S)\SOCKS5\SPS proxy support Superior load balance and high availability. Multiple superiors repeat -P parameters.    
+Load balancing have 5 kinds of policy, It can be specified by the `--lb-method` parameter.:
+roundrobin take turns
+leastconn  Using minimum connection number
+leasttime  Use minimum connection time
+hash     Use the client address to calculate a fixed superior
+weight    According to the weight and connection number of each superior, choose a superior
+Tips:
+The load balance check interval can be set by `--lb-retrytime`, unit milliseconds.
+Load balancing connection timeout can be set by `--lb-timeout`, unit milliseconds.
+If the load balance policy is weighted (weight), the -P format is: 2.2.2.2:3880@1,1 is the weight which is greater than 0.
+If the load balance strategy is hash, the default is to select the parent based on the client address, and the parent can be selected by switching `- lb-hashtarget', using the access destination address.
+
 ### **1.HTTP proxy**  
 #### **1.1.common HTTP proxy**  
 ![1.1](/docs/images/http-1.png)  
@ -455,7 +495,32 @@ Local third level execution:
 `proxy http -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 through this way, When you visits the website by local proxy 8080, it visits the target website by compressed transmission with the parents proxy. 

-#### **1.14.view help**  
+### **1.14 Load balance**  
+HTTP (S) proxy supports superior load balance, and multiple -P parameters can be repeated by multiple superiors.   
+`proxy http --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080`   
+
+#### **1.14.1 Set retry interval and timeout time**  
+`proxy http --lb-method=leastconn --lb-retrytime 300 --lb-timeout 300 -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -t tcp -p :33080`   
+
+#### **1.14.2 Set weight**  
+`proxy http --lb-method=weight -T tcp -P 1.1.1.1:33080@1 -P 2.1.1.1:33080@2 -P 3.1.1.1:33080@1 -t tcp -p :33080`
+
+#### **1.14.3 Use target address to select superior**  
+`proxy http --lb-hashtarget --lb-method=leasttime -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -t tcp -p :33080`
+
+### **1.15 Speed limit**  
+The speed limit is 100K, which can be specified through the `-l` parameter, for example: 100K 1.5M. 0 means unlimited.   
+`proxy http -t tcp -p 2.2.2.2:33080 -l 100K`
+
+### **1.16 Designated exporting IP**  
+The `- bind-listen` parameter opens the client's ability to access the target site with an entry IP connection, using the entry IP as the exporting IP. If the entry IP is the intranet IP, the exporting IP will not use the entry IP..    
+`proxy http -t tcp -p 2.2.2.2:33080 --bind-listen`
+
+### **1.17 Certificate parameters using Base64 data**  
+By default, the -C and -K parameters are the paths of CRT certificates and key files,
+If it is the beginning of base64://, then it is considered that the data behind is Base64 encoded and will be used after decoding.
+
+#### **1.18.view help**  
 `./proxy help http`  
  
 ### **2.TCP proxy**  
@ -502,7 +567,26 @@ TCP third level proxy (local)
 `./proxy tcp -p ":8080" -T tls -P "33.33.33.33:28080" -C proxy.crt -K proxy.key`  
 Then access to the local 8080 port is to access the 8080 port of the 66.66.66.66 by encrypting the TCP tunnel.  
  
-#### **2.6.view help**  
+#### **2.6.Connect parents proxy through other proxy**  
+Sometimes the proxy network can not directly access the external network,which need to use a HTTPS or Socks5 proxy to access the Internet. then The -J parameter can help you connect to the parent proxy through the HTTPS or Socks5 proxy when proxy's TCP port is mapped, which can map external port to local.    
+-J param format:  
+
+https proxy:  
+proxy need authentication,username: username password:password  
+https://username:password@host:port  
+proxy don't need authentication  
+https://host:port  
+
+socks5 proxy:
+proxy need authentication,username: username password:password  
+socks5://username:password@host:port
+proxy don't need authentication  
+socks5://host:port
+
+host:proxy's domain or ip
+port:proxy's port
+  
+#### **2.7.view help**  
 `./proxy help tcp`  
  
 ### **3.UDP proxy**  
@ -686,7 +770,26 @@ Procedure:
  
  4.7.3.LOCAL_IP is empty which means LOCAL_IP is `0.0.0.0`, CLIENT_LOCAL_HOST is empty which means LOCAL_IP is `127.0.0.1`.
  
-#### **4.8.view help**  
+#### **4.8.server and client connect bridge through proxy**   
+Sometimes the server or client can not directly access the external network,which need to use a HTTPS or Socks5 proxy to access the Internet. then The -J parameter can help server and client connect to the bridge through the HTTPS or Socks5 proxy.    
+-J param format:  
+
+https proxy:  
+proxy need authentication,username: username password:password  
+https://username:password@host:port  
+proxy don't need authentication  
+https://host:port  
+
+socks5 proxy:
+proxy need authentication,username: username password:password  
+socks5://username:password@host:port
+proxy don't need authentication  
+socks5://host:port
+
+host:proxy's domain or ip
+port:proxy's port
+
+#### **4.9.view help**  
 `./proxy help bridge`  
 `./proxy help server`  
 `./proxy help client`  
@ -826,41 +929,80 @@ Local third level execution:
 `proxy socks -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 through this way, When you visits the website by local proxy 8080, it visits the target website by compressed transmission with the parents proxy.    

-#### **5.12.view help**  
+#### **5.12 Load balance**  
+SOCKS proxy supports the load balancing of superior authorities, and the -P parameters can be repeated by multiple superiors.   
+`proxy socks --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080  -p :33080 -t tcp`
+
+#### **5.12.1 Set retry interval and timeout time**  
+`proxy socks --lb-method=leastconn --lb-retrytime 300 --lb-timeout 300 -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -p :33080 -t tcp`
+
+#### **5.12.2 Set weight**  
+`proxy socks --lb-method=weight -T tcp -P 1.1.1.1:33080@1 -P 2.1.1.1:33080@2 -P 3.1.1.1:33080@1 -p :33080 -t tcp`
+
+#### **5.12.3 Use target address to select parent proxy**  
+`proxy socks --lb-hashtarget --lb-method=leasttime -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -p :33080 -t tcp`
+
+#### **5.13 Speed limit**  
+The speed limit is 100K, which can be specified through the -l parameter, for example: 100K 1.5M. 0 means unlimited.   
+`proxy socks -t tcp -p 2.2.2.2:33080 -l 100K`
+
+#### **5.14 Designated exporting IP**  
+The `- bind-listen` parameter opens the client's ability to access the target site with an entry IP connection, using the entry IP as the exporting IP. If the entry IP is the intranet IP, the exporting IP will not use the entry IP..    
+`proxy socks -t tcp -p 2.2.2.2:33080 --bind-listen`
+
+#### **5.15 Cascade authentication**  
+SOCKS5 supports cascading authentication, and -A can set up parents proxy's authentication information..    
+parents proxy:
+`proxy socks -t tcp -p 2.2.2.2:33080 -a user:pass`
+localhost:
+`proxy socks -T tcp -P 2.2.2.2:33080 -A user:pass -t tcp -p :33080`
+
+#### **5.16 Certificate parameters using Base64 data**  
+By default, the -C and -K parameters are the paths of CRT certificates and key files,    
+If it is the beginning of base64://, then it is considered that the data behind is Base64 encoded and will be used after decoding..   
+
+#### **5.17.view help**  
 `./proxy help socks`  

 ### **6.Proxy protocol conversion** 

 #### **6.1.Functional introduction** 
-The proxy protocol conversion use the SPS subcommand (abbreviation of socks+https), SPS itself does not provide the proxy function, just accept the proxy request and then converse protocol and forwarded to the existing HTTP (s) or Socks5 proxy. SPS can use existing HTTP (s) or Socks5 proxy converse to support HTTP (s) and Socks5 HTTP (s) proxy at the same time by one port, and proxy supports forward and reverse proxy (SNI), SOCKS5 proxy which is conversed does not support UDP. in addition to the existing HTTP or Socks5 proxy, which supports TLS, TCP, KCP three modes and chain-style connection. That is more than one SPS node connection can build encryption channel.
+The proxy protocol conversion use the SPS subcommand, SPS itself does not provide the proxy function, just accept the proxy request and then converse protocol and forwarded to the existing HTTP (s) or Socks5 proxy. SPS can use existing HTTP (s) or Socks5 proxy converse to support HTTP (s) and Socks5 HTTP (s) proxy at the same time by one port, and proxy supports forward and reverse proxy (SNI), SOCKS5 proxy which is also does support UDP when parent is Socks5. in addition to the existing HTTP or Socks5 proxy, which supports TLS, TCP, KCP three modes and chain-style connection. That is more than one SPS node connection can build encryption channel.

 #### **6.2.HTTP(S) to HTTP(S) + SOCKS5** 
-Suppose there is a common HTTP (s) proxy: 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s) and Socks5 at the same time. The local port after transformation is 18080.  
+Suppose there is a common HTTP (s) proxy: 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time. The local port after transformation is 18080. ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S http -T tcp -P 127.0.0.1:8080 -t tcp -p :18080`
+`./proxy sps -S http -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`

-Suppose that there is a TLS HTTP (s) proxy: 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s) and Socks5 at the same time. The local port after transformation is 18080, TLS needs certificate file.  
+Suppose that there is a TLS HTTP (s) proxy: 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time. The local port after transformation is 18080, TLS needs certificate file，ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S http -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key`   
+`./proxy sps -S http -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key -h aes-192-cfb -j pass`   

-Suppose there is a KCP HTTP (s) proxy (password: demo123): 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s) and Socks5 at the same time. The local port after transformation is 18080.  
+Suppose there is a KCP HTTP (s) proxy (password: demo123): 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time. The local port after transformation is 18080. ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S http -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123`  
+`./proxy sps -S http -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123 -h aes-192-cfb -j pass`  

 #### **6.3.SOCKS5 to HTTP(S) + SOCKS5** 
-Suppose there is a common Socks5 proxy: 127.0.0.1:8080, now we turn it into a common proxy that supports HTTP (s) and Socks5 at the same time, and the local port after transformation is 18080.  
+Suppose there is a common Socks5 proxy: 127.0.0.1:8080, now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time, and the local port after transformation is 18080. ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S socks -T tcp -P 127.0.0.1:8080 -t tcp -p :18080`
+`./proxy sps -S socks -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`

-Suppose there is a TLS Socks5 proxy: 127.0.0.1:8080. Now we turn it into a common proxy that support HTTP (s) and Socks5 at the same time. The local port after transformation is 18080, TLS needs certificate file.  
+Suppose there is a TLS Socks5 proxy: 127.0.0.1:8080. Now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time. The local port after transformation is 18080, TLS needs certificate file. ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S socks -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key`   
+`./proxy sps -S socks -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key -h aes-192-cfb -j pass`   

-Suppose there is a KCP Socks5 proxy (password: demo123): 127.0.0.1:8080, now we turn it into a common proxy that support HTTP (s) and Socks5 at the same time, and the local port after transformation is 18080.  
+Suppose there is a KCP Socks5 proxy (password: demo123): 127.0.0.1:8080, now we turn it into a common proxy that supports HTTP (s), Socks5 and ss at the same time, and the local port after transformation is 18080. ss's Encryption method is aes-192-cfb and its password is pass.  
 command：  
-`./proxy sps -S socks -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123`  
+`./proxy sps -S socks -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123 -h aes-192-cfb -j pass`  

-#### **6.4.Chain style connection** 
+#### **6.4 SS to HTTP(S)+SOCKS5+SS** 
+SPS support the SS protocol with the local authorities. The parent proxy can be SPS or standard SS services.  
+By default, SPS provides three proxies, HTTP (S), SOCKS5 and SPS. the converted SOCKS5 and SS support UDP when the parent proxy is SOCKS5.  
+Suppose there is an ordinary SS or SPS proxy (open SS, encryption: aes-256-cfb, password: Demo)：127.0.0.1:8080,Now we turn it into a common proxy that supports both http (s) and Socks5 and ss. The converted local port is 18080, and the converted ss encryption mode is aes-192-cfb, ss password:pass.  
+command：  
+`./proxy sps -S socks -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123`  	`./proxy sps -S ss -H aes-256-cfb -J pass -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`.  
+
+#### **6.5.Chain style connection** 
 ![6.4](/docs/images/sps-tls.png)  
 It is mentioned above that multiple SPS nodes can be connected to build encrypted channels, assuming you have the following VPS and a PC.  
 vps01：2.2.2.2  
@ -880,11 +1022,11 @@ Then run a SPS node on the PC，excute：

 finish。  

-#### **6.5.Listening on multiple ports**   
+#### **6.6.Listening on multiple ports**   
 In general, listening one port is enough, but if you need to monitor 80 and 443 ports at the same time as a reverse proxy, the -p parameter can support it.  
 The format is：`-p 0.0.0.0:80,0.0.0.0:443`, Multiple bindings are separated by a comma.  

-#### **6.6.Authentication** 
+#### **6.7.Authentication** 
 SPS supports HTTP(s)\socks5 proxy authentication, which can concatenate authentication, there are four important information:  
 1:Users send authentication information`user-auth`。   
 2:Local authentication information set up`local-auth`。  
@ -926,7 +1068,7 @@ target: if the client is the HTTP (s) proxy request, this represents the complet
 If there is no -a or -F or --auth-url parameters, local authentication is closed.  
 If there is no -A parameter, the connection to the father proxy does not use authentication.  

-#### **6.7 Custom encryption**  
+#### **6.8 Custom encryption**  
 HTTP(s) proxy can encrypt TCP data by TLS standard encryption and KCP protocol encryption, in addition to supporting custom encryption after TLS and KCP, That is to say, custom encryption and tls|kcp can be combined to use. The internal AES256 encryption is used, and it only needs to define one password by yourself. Encryption is divided into two parts, the one is whether the local (-z) is encrypted and decrypted, the other is whether the parents (-Z) is encrypted and decrypted.
 Custom encryption requires both ends are proxy. Next, we use two level example and three level example as examples:  
 Suppose there is already a HTTP (s) proxy:`6.6.6.6:6666`  
@ -947,7 +1089,7 @@ Local third level execution:
 `proxy sps -T tcp -P 3.3.3.3:8888 -Z other_password -t tcp -p :8080`  
 through this way, When you visits the website by local proxy 8080, it visits the target website by encryption transmission with the parents proxy.  

-#### **6.8 Compressed transmission**  
+#### **6.9 Compressed transmission**  
 HTTP(s) proxy can encrypt TCP data through TCP standard encryption and KCP protocol encryption, and can also compress data before custom encryption.
 That is to say, compression and custom encryption and tls|kcp can be used together, compression is divided into two parts, the one is whether the local (-z) is compressed transmission, the other is whether the parents (-Z) is compressed transmission.
 The compression requires both ends are proxy. Compression also protects the (encryption) data in certain extent. we use two level example and three level example as examples:  
@ -968,7 +1110,30 @@ Local third level execution:
 `proxy sps -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 through this way, When you visits the website by local proxy 8080, it visits the target website by compressed transmission with the parents proxy.    

-#### **6.9.view help** 
+#### **6.10 Disable protocol**  	
+By default, SPS's port supports two proxy protocols, http (s) and socks5, and we can disable a protocol with parameters.  	 
+for example:  
+1.Disable the HTTP (S) proxy, retaining only the SOCKS5 proxy,parameter:`--disable-http`.   
+`proxy sps -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080 --disable-http`
+1.Disable the SOCKS5 proxy, retaining only the HTTP (S) proxy,parameter:`--disable-socks`.     
+`proxy sps -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080 --disable-http`    
+
+#### **6.11 Speed limit**  
+Suppose there has a SOCKS5 parent proxy:
+`proxy socks -p 2.2.2.2:33080 -z password -t tcp`
+SPS lower speed limit 100K
+`proxy sps -S socks -P 2.2.2.2:33080 -T tcp -Z password -l 100K -t tcp -p :33080`
+It can be specified through the `-l` parameter, for example: 100K 1.5M. 0 means unlimited..
+
+#### **6.12 Designated exporting IP**  
+The `- bind-listen` parameter opens the client's ability to access the target site with an entry IP connection, using the entry IP as the exporting IP. If the entry IP is the intranet IP, the exporting IP will not use the entry IP.
+`proxy sps -S socks -P 2.2.2.2:33080 -T tcp -Z password -l 100K -t tcp --bind-listen -p :33080`
+
+#### **6.13 Certificate parameters using Base64 data**  
+By default, the -C and -K parameters are the paths of CRT certificates and key files,
+If it is the beginning of base64://, then it is considered that the data behind is Base64 encoded and will be used after decoding.
+
+#### **6.14.view help** 
 `./proxy help sps` 

 ### **7.KCP Configuration**   
--- a/README_ZH.md
+++ b/README_ZH.md
@ -1,5 +1,5 @@
 <img src="https://github.com/snail007/goproxy/blob/master/docs/images/logo.jpg?raw=true" width="200"/>  
-Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务器,支持正向代理、反向代理、透明代理、内网穿透、TCP/UDP端口映射、SSH中转、TLS加密传输、协议转换、防污染DNS代理。
+Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5,ss代理服务器,支持正向代理、反向代理、透明代理、内网穿透、TCP/UDP端口映射、SSH中转、TLS加密传输、协议转换、防污染DNS代理。

 [点击下载](https://github.com/snail007/goproxy/releases) 官方QQ交流群:189618940  

@ -13,6 +13,8 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务

 **[全平台SDK](/sdk/README.md)**

+**[GoProxy特殊授权](/AUTHORIZATION.md)**
+
 ### 如何贡献代码(Pull Request)?  

 欢迎加入一起发展壮大proxy.首先需要clone本项目到自己的帐号下面,   
@ -33,10 +35,16 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
 - 集成外部API，HTTP(S),SOCKS5代理认证功能可以与外部HTTP API集成，可以方便的通过外部系统控制代理用户．  
 - 反向代理,支持直接把域名解析到proxy监听的ip,然后proxy就会帮你代理访问需要访问的HTTP(S)网站.
 - 透明HTTP(S)代理,配合iptables,在网关直接把出去的80,443方向的流量转发到proxy,就能实现无感知的智能路由器代理.  
- 协议转换，可以把已经存在的HTTP(S)或SOCKS5代理转换为一个端口同时支持HTTP(S)和SOCKS5代理，转换后的SOCKS5代理不支持UDP功能,同时支持强大的级联认证功能。
+- 协议转换，可以把已经存在的HTTP(S)或SOCKS5或SS代理转换为一个端口同时支持HTTP(S)和SOCKS5和SS代理，转换后的SOCKS5和SS代理如果上级是SOCKS5代理,那么支持UDP功能,同时支持强大的级联认证功能。
 - 自定义底层加密传输，http(s)\sps\socks代理在tcp之上可以通过tls标准加密以及kcp协议加密tcp数据,除此之外还支持在tls和kcp之后进行自定义加密,也就是说自定义加密和tls|kcp是可以联合使用的,内部采用AES256加密,使用的时候只需要自己定义一个密码即可。
 - 底层压缩高效传输，http(s)\sps\socks代理在tcp之上可以通过自定义加密和tls标准加密以及kcp协议加密tcp数据,在加密之后还可以对数据进行压缩,也就是说压缩功能和自定义加密和tls|kcp是可以联合使用的。
 - 安全的DNS代理，可以通过本地的proxy提供的DNS代理服务器与上级代理加密通讯实现安全防污染的DNS查询。
+- 负载均衡,高可用,HTTP(S)\SOCKS5\SPS代理支持上级负载均衡和高可用,多个上级重复-P参数即可.
+- 指定出口IP,HTTP(S)\SOCKS5\SPS代理支持客户端用入口IP连接过来的,就用入口IP作为出口IP访问目标网站的功能。如果入口IP是内网IP，出口IP不会使用入口IP
+- 支持限速,HTTP(S)\SOCKS5\SPS代理支持限速.
+- SOCKS5代理支持级联认证.
+- 证书参数使用base64数据,默认情况下-C,-K参数是crt证书和key文件的路径,如果是base64://开头,那么就认为后面的数据是base64编码的,会解码后使用.
+

 ### Why need these?  
 - 当由于某某原因,我们不能访问我们在其它地方的服务,我们可以通过多个相连的proxy节点建立起一个安全的隧道访问我们的服务.  
@ -48,7 +56,7 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
 - ...  

 
-本页是v5.2手册,其他版本手册请点击[这里](docs/old-release.md)查看. 
+本页是v5.4手册,其他版本手册请点击[这里](docs/old-release.md)查看. 
 

 ### 怎么找到组织?  
@ -70,8 +78,9 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
 - [安全建议](#安全建议)

 ### 手册目录
+- [负载均衡和高可用](#负载均衡和高可用)
 - [1. HTTP代理](#1http代理)
-    - [1.1 普通HTTP代理](#11普通http代理)
+    - [1.1 普通HTTP代理](#11普通一级http代理)
    - [1.2 普通二级HTTP代理](#12普通二级http代理)
    - [1.3 HTTP二级代理(加密)](#13http二级代理加密)
    - [1.4 HTTP三级代理(加密)](#14http三级代理加密)
@ -86,15 +95,20 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
    - [1.11 自定义DNS](#111-自定义dns)
    - [1.12 自定义加密](#112-自定义加密)
    - [1.13 压缩传输](#113-压缩传输)
-    - [1.14 查看帮助](#114-查看帮助)
- [2. TCP代理](#2tcp代理)
+    - [1.14 负载均衡](#114-负载均衡)
+    - [1.15 限速](#115-限速)
+    - [1.16 指定出口IP](#116-指定出口ip)
+    - [1.17 证书参数使用base64数据](#117-证书参数使用base64数据)
+    - [1.18 查看帮助](#118-查看帮助)
+- [2. TCP代理(端口映射)](#2tcp代理)
    - [2.1 普通一级TCP代理](#21普通一级tcp代理)
    - [2.2 普通二级TCP代理](#22普通二级tcp代理)
    - [2.3 普通三级TCP代理](#23普通三级tcp代理)
    - [2.4 加密二级TCP代理](#24加密二级tcp代理)
    - [2.5 加密三级TCP代理](#25加密三级tcp代理)
-    - [2.6 查看帮助](#26查看帮助)
- [3. UDP代理](#3udp代理)
+    - [2.6 通过代理连接上级](#26通过代理连接上级)
+    - [2.7 查看帮助](#27查看帮助)
+- [3. UDP代理(端口映射)](#3udp代理)
    - [3.1 普通一级UDP代理](#31普通一级udp代理)
    - [3.2 普通二级UDP代理](#32普通二级udp代理)
    - [3.3 普通三级UDP代理](#33普通三级udp代理)
@ -109,7 +123,8 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
    - [4.5 高级用法一](#45高级用法一)
    - [4.6 高级用法一](#46高级用法二)
    - [4.7 server的-r参数](#47server的-r参数)
-    - [4.8 查看帮助](#48查看帮助)
+    - [4.8 server和client通过代理连接bridge](#48server和client通过代理连接bridge)
+    - [4.9 查看帮助](#49查看帮助)
 - [5. SOCKS5代理](#5socks5代理)
    - [5.1 普通SOCKS5代理](#51普通socks5代理)
    - [5.2 普通二级SOCKS5代理](#52普通二级socks5代理)
@ -124,18 +139,27 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
    - [5.9 自定义DNS](#59自定义dns)
    - [5.10 自定义加密](#510-自定义加密)
    - [5.11 压缩传输](#511-压缩传输)
-    - [5.12 查看帮助](#512查看帮助)
+    - [5.12 负载均衡](#512-负载均衡)
+    - [5.13 限速](#513-限速)
+    - [5.14 指定出口IP](#514-指定出口ip)
+    - [5.15 级联认证](#515-级联认证)
+    - [5.16 证书参数使用base64数据](#516-证书参数使用base64数据)
+    - [5.17 查看帮助](#517查看帮助)
 - [6. 代理协议转换](#6代理协议转换)
    - [6.1 功能介绍](#61-功能介绍)
-    - [6.2 HTTP(S)转HTTP(S)+SOCKS5](#62-https转httpssocks5)
-    - [6.3 SOCKS5转HTTP(S)+SOCKS5](#63-socks5转httpssocks5)
-    - [6.4 链式连接](#64-链式连接)
-    - [6.5 监听多个端口](#65-监听多个端口)
-    - [6.6 认证功能](#66-认证功能)
-    - [6.7 自定义加密](#67-自定义加密)
-    - [6.8 压缩传输](#68-压缩传输)
-    - [6.9 禁用协议](#69-禁用协议)
-    - [6.10 查看帮助](#610-查看帮助)
+    - [6.2 HTTP(S)转HTTP(S)+SOCKS5+SS](#62-https转httpssocks5ss)
+    - [6.3 SOCKS5转HTTP(S)+SOCKS5+SS](#63-socks5转httpssocks5ss)
+    - [6.4 SS转HTTP(S)+SOCKS5+SS](#64-ss转httpssocks5ss)
+    - [6.5 链式连接](#65-链式连接)
+    - [6.6 监听多个端口](#66-监听多个端口)
+    - [6.7 认证功能](#67-认证功能)
+    - [6.8 自定义加密](#68-自定义加密)
+    - [6.9 压缩传输](#69-压缩传输)
+    - [6.10 禁用协议](#610-禁用协议)
+    - [6.11 限速](#611-限速)
+    - [6.12 指定出口IP](#612-指定出口ip)
+    - [6.13 证书参数使用base64数据](#613-证书参数使用base64数据)
+    - [6.14 查看帮助](#614-查看帮助)
 - [7. KCP配置](#7kcp配置)
    - [7.1 配置介绍](#71-配置介绍)
    - [7.2 详细配置](#72-详细配置)
@ -150,7 +174,7 @@ Proxy是golang实现的高性能http,https,websocket,tcp,udp,socks5代理服务
 ```shell  
 curl -L https://raw.githubusercontent.com/snail007/goproxy/master/install_auto.sh | bash  
 ```  
-安装完成,配置目录是/etc/proxy,更详细的使用方法参考下面的进一步了解.  
+安装完成,配置目录是/etc/proxy,更详细的使用方法请参考上面的手册目录,进一步了解你想要使用的功能.  
 如果安装失败或者你的vps不是linux64位系统,请按照下面的半自动步骤安装:  
  
 #### 手动安装  
@ -159,7 +183,7 @@ curl -L https://raw.githubusercontent.com/snail007/goproxy/master/install_auto.s
 下载地址:https://github.com/snail007/goproxy/releases  
 ```shell  
 cd /root/proxy/  
-wget https://github.com/snail007/goproxy/releases/download/v5.1/proxy-linux-amd64.tar.gz  
+wget https://github.com/snail007/goproxy/releases/download/v6.1/proxy-linux-amd64.tar.gz  
 ```  
 #### **2.下载自动安装脚本**  
 ```shell  
@ -170,12 +194,12 @@ chmod +x install.sh
 ```  

 #### Docker安装 
-项目根目录的Dockerfile文件用来构建,使用golang 1.10.3,构建基于goproxy v5.1,
+项目根目录的Dockerfile文件用来构建,使用golang 1.10.3,构建基于goproxy的master分支最新版本,  
 全部大小17.3MB,默认情况下使用master分支,不过可以通过修改配置文件Dockerfile  
 或者使用参数GOPROXY_VERSION指定构建的goproxy版本.  

 ```
-ARG GOPROXY_VERSION=v5.1
+ARG GOPROXY_VERSION=v5.3
 ```

 步骤:  
@ -185,14 +209,14 @@ sudo docker build .
 ```
 2. 镜像打标签:
 ```
-sudo docker tag <上一步的结果ID> goproxy/goproxy:latest
+sudo docker tag <上一步的结果ID> snail007/goproxy:latest
 ```
 3. 运行 
 参数OPTS的值就是传递给proxy的所有参数
 比如下面的例子启动了一个http服务:

 ```
-sudo docker run -d --restart=always --name goproxy -e OPTS="http -p :33080" -p 33080:33080 goproxy/goproxy:latest
+sudo docker run -d --restart=always --name goproxy -e OPTS="http -p :33080" -p 33080:33080 snail007/goproxy:latest
 ```
 4. 查看日志:
 ```
@ -258,6 +282,32 @@ proxy会fork子进程,然后监控子进程,如果子进程异常退出,5秒后
 假设你的vps外网ip是23.23.23.23,下面命令通过-g参数设置23.23.23.23  
 `./proxy http -g "23.23.23.23"`  

+### **负载均衡和高可用**
+
+HTTP(S)\SOCKS5\SPS代理支持上级负载均衡和高可用,多个上级重复-P参数即可.
+
+负载均衡策略支持5种,可以通过`--lb-method`参数指定:
+
+roundrobin 轮流使用
+
+leastconn  使用最小连接数的
+
+leasttime  使用连接时间最小的
+
+hash     使用根据客户端地址计算出一个固定上级
+
+weight    根据每个上级的权重和连接数情况,选择出一个上级
+
+提示:
+
+负载均衡检查时间间隔可以通过`--lb-retrytime`设置,单位毫秒
+
+负载均衡连接超时时间可以通过`--lb-timeout`设置,单位毫秒
+
+如果负载均衡策略是权重(weight),-P格式为:2.2.2.2:3880@1,1就是权重,大于0的整数.
+
+如果负载均衡策略是hash,默认是根据客户端地址选择上级,可以通过开关`--lb-hashtarget`使用访问的目标地址选择上级.
+
 ### **1.HTTP代理**  
 #### **1.1.普通一级HTTP代理**  
 ![1.1](/docs/images/http-1.png)  
@ -459,7 +509,43 @@ proxy的http(s)代理在tcp之上可以通过tls标准加密以及kcp协议加
 `proxy http -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 这样通过本地代理8080访问网站的时候就是通过与上级压缩传输访问目标网站.  

-#### **1.14 查看帮助**  
+### **1.14 负载均衡**  
+
+HTTP(S)代理支持上级负载均衡,多个上级重复-P参数即可.
+
+`proxy http --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080`
+
+#### **1.14.1 设置重试间隔和超时时间**  
+
+`proxy http --lb-method=leastconn --lb-retrytime 300 --lb-timeout 300 -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -t tcp -p :33080`
+
+#### **1.14.2 设置权重**  
+
+`proxy http --lb-method=weight -T tcp -P 1.1.1.1:33080@1 -P 2.1.1.1:33080@2 -P 3.1.1.1:33080@1 -t tcp -p :33080`
+
+#### **1.14.3 使用目标地址选择上级**  
+
+`proxy http --lb-hashtarget --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -t tcp -p :33080`
+
+### **1.15 限速**  
+
+限速100K,通过`-l`参数即可指定,比如:100K 1.5M . 0意味着无限制.
+
+`proxy http -t tcp -p 2.2.2.2:33080 -l 100K`
+
+### **1.16 指定出口IP**  
+
+`--bind-listen`参数，就可以开启客户端用入口IP连接过来的,就用入口IP作为出口IP访问目标网站的功能。如果入口IP是内网IP，出口IP不会使用入口IP。
+
+`proxy http -t tcp -p 2.2.2.2:33080 --bind-listen`
+
+### **1.17 证书参数使用base64数据**  
+
+默认情况下-C,-K参数是crt证书和key文件的路径,
+
+如果是base64://开头,那么就认为后面的数据是base64编码的,会解码后使用.
+
+#### **1.18 查看帮助**  
 `./proxy help http`  
  
 ### **2.TCP代理**  
@ -506,7 +592,27 @@ VPS(IP:22.22.22.33)执行:
 `./proxy tcp -p ":8080" -T tls -P "33.33.33.33:28080" -C proxy.crt -K proxy.key`  
 那么访问本地8080端口就是通过加密TCP隧道访问66.66.66.66的8080端口.  
  
-#### **2.6.查看帮助**  
+#### **2.6.通过代理连接上级**  
+有时候proxy所在的网络不能直接访问外网,需要通过一个https或者socks5代理才能上网,那么这个时候  
+-J参数就可以帮助你让proxy的tcp端口映射的时候通过https或者socks5代理去连接上级-P,将外部端口映射到本地.    
+-J参数格式如下:  
+
+https代理写法:  
+代理需要认证,用户名:username 密码:password  
+https://username:password@host:port  
+代理不需要认证  
+https://host:port  
+
+socks5代理写法:
+代理需要认证,用户名:username 密码:password
+socks5://username:password@host:port
+代理不需要认证
+socks5://host:port
+
+host:代理的IP或者域名
+port:代理的端口
+
+#### **2.7.查看帮助**  
 `./proxy help tcp`  
  
 ### **3.UDP代理**  
@ -693,7 +799,27 @@ server连接到bridge的时候,如果同时有多个client连接到同一个brid
  
  4.7.3.LOCAL_IP为空默认是:`0.0.0.0`,CLIENT_LOCAL_HOST为空默认是:`127.0.0.1`; 

-#### **4.8.查看帮助**  
+#### **4.8.server和client通过代理连接bridge**  
+有时候server或者client所在的网络不能直接访问外网,需要通过一个https或者socks5代理才能上网,那么这个时候  
+-J参数就可以帮助你让server或者client通过https或者socks5代理去连接bridge.  
+-J参数格式如下:  
+
+https代理写法:  
+代理需要认证,用户名:username 密码:password  
+https://username:password@host:port  
+代理不需要认证  
+https://host:port  
+
+socks5代理写法:
+代理需要认证,用户名:username 密码:password
+socks5://username:password@host:port
+代理不需要认证
+socks5://host:port
+
+host:代理的IP或者域名
+port:代理的端口
+
+#### **4.9.查看帮助**  
 `./proxy help bridge`  
 `./proxy help server`  
 `./proxy help client`  
@ -848,41 +974,98 @@ proxy的socks代理在tcp之上可以通过自定义加密和tls标准加密以
 `proxy socks -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 这样通过本地代理8080访问网站的时候就是通过与上级压缩传输访问目标网站.  

-#### **5.12.查看帮助**  
+
+#### **5.12 负载均衡**  
+
+SOCKS代理支持上级负载均衡,多个上级重复-P参数即可.
+
+`proxy socks --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080  -p :33080 -t tcp`
+
+#### **5.12.1 设置重试间隔和超时时间**  
+
+`proxy socks --lb-method=leastconn --lb-retrytime 300 --lb-timeout 300 -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -p :33080 -t tcp`
+
+#### **5.12.2 设置权重**  
+
+`proxy socks --lb-method=weight -T tcp -P 1.1.1.1:33080@1 -P 2.1.1.1:33080@2 -P 3.1.1.1:33080@1 -p :33080 -t tcp`
+
+#### **5.12.3 使用目标地址选择上级**  
+
+`proxy socks --lb-hashtarget --lb-method=hash -T tcp -P 1.1.1.1:33080 -P 2.1.1.1:33080 -P 3.1.1.1:33080 -p :33080 -t tcp`
+
+#### **5.13 限速**  
+
+限速100K,通过`-l`参数即可指定,比如:100K 1.5M . 0意味着无限制.
+
+`proxy socks -t tcp -p 2.2.2.2:33080 -l 100K`
+
+#### **5.14 指定出口IP**  
+
+`--bind-listen`参数，就可以开启客户端用入口IP连接过来的,就用入口IP作为出口IP访问目标网站的功能。如果入口IP是内网IP，出口IP不会使用入口IP。
+
+`proxy socks -t tcp -p 2.2.2.2:33080 --bind-listen`
+
+#### **5.15 级联认证**  
+
+SOCKS5支持级联认证,-A可以设置上级认证信息.
+
+上级:
+
+`proxy socks -t tcp -p 2.2.2.2:33080 -a user:pass`
+
+本地:
+
+`proxy socks -T tcp -P 2.2.2.2:33080 -A user:pass -t tcp -p :33080`
+
+#### **5.16 证书参数使用base64数据**  
+
+默认情况下-C,-K参数是crt证书和key文件的路径,
+
+如果是base64://开头,那么就认为后面的数据是base64编码的,会解码后使用.
+
+
+#### **5.17.查看帮助**  
 `./proxy help socks`  

 ### **6.代理协议转换** 

 #### **6.1 功能介绍** 
-代理协议转换使用的是sps子命令(socks+https的缩写)，sps本身不提供代理功能，只是接受代理请求"转换并转发"给已经存在的http(s)代理或者socks5代理；sps可以把已经存在的http(s)代理或者socks5代理转换为一个端口同时支持http(s)和socks5代理，而且http(s)代理支持正向代理和反向代理(SNI)，转换后的SOCKS5代理不支持UDP功能；另外对于已经存在的http(s)代理或者socks5代理，支持tls、tcp、kcp三种模式，支持链式连接，也就是可以多个sps结点层级连接构建加密通道。
+代理协议转换使用的是sps子命令，sps本身不提供代理功能，只是接受代理请求"转换并转发"给已经存在的http(s)代理或者socks5代理或者ss代理；sps可以把已经存在的http(s)代理或者socks5代理或ss代理转换为一个端口同时支持http(s)和socks5和ss的代理，而且http(s)代理支持正向代理和反向代理(SNI)，转换后的SOCKS5代理，当上级是SOCKS5或者SS时仍然支持UDP功能；另外对于已经存在的http(s)代理或者socks5代理，支持tls、tcp、kcp三种模式，支持链式连接，也就是可以多个sps结点层级连接构建加密通道。

-#### **6.2 HTTP(S)转HTTP(S)+SOCKS5** 
-假设已经存在一个普通的http(s)代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080。  
+#### **6.2 HTTP(S)转HTTP(S)+SOCKS5+SS** 
+假设已经存在一个普通的http(s)代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080,ss加密方式:aes-192-cfb,ss密码:pass。  
 命令如下：  
-`./proxy sps -S http -T tcp -P 127.0.0.1:8080 -t tcp -p :18080`
+`./proxy sps -S http -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`

-假设已经存在一个tls的http(s)代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080，tls需要证书文件。  
+假设已经存在一个tls的http(s)代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080，tls需要证书文件,ss加密方式:aes-192-cfb,ss密码:pass。  
 命令如下：  
-`./proxy sps -S http -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key`   
+`./proxy sps -S http -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key -h aes-192-cfb -j pass`   

-假设已经存在一个kcp的http(s)代理（密码是：demo123）：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080。  
+假设已经存在一个kcp的http(s)代理（密码是：demo123）：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080,ss加密方式:aes-192-cfb,ss密码:pass。  
 命令如下：  
-`./proxy sps -S http -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123`  
+`./proxy sps -S http -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123 -h aes-192-cfb -j pass`  

-#### **6.3 SOCKS5转HTTP(S)+SOCKS5** 
-假设已经存在一个普通的socks5代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080。  
+#### **6.3 SOCKS5转HTTP(S)+SOCKS5+SS** 
+假设已经存在一个普通的socks5代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080,ss加密方式:aes-192-cfb,ss密码:pass。    
 命令如下：  
-`./proxy sps -S socks -T tcp -P 127.0.0.1:8080 -t tcp -p :18080`
+`./proxy sps -S socks -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`

-假设已经存在一个tls的socks5代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080，tls需要证书文件。  
+假设已经存在一个tls的socks5代理：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080，tls需要证书文件,ss加密方式:aes-192-cfb,ss密码:pass。   
 命令如下：  
-`./proxy sps -S socks -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key`   
+`./proxy sps -S socks -T tls -P 127.0.0.1:8080 -t tcp -p :18080 -C proxy.crt -K proxy.key -h aes-192-cfb -j pass`   

-假设已经存在一个kcp的socks5代理（密码是：demo123）：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5的普通代理,转换后的本地端口为18080。  
+假设已经存在一个kcp的socks5代理（密码是：demo123）：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080,ss加密方式:aes-192-cfb,ss密码:pass。  
 命令如下：  
-`./proxy sps -S socks -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123`  
+`./proxy sps -S socks -T kcp -P 127.0.0.1:8080 -t tcp -p :18080 --kcp-key demo123 -h aes-192-cfb -j pass`  

-#### **6.4 链式连接**   
+#### **6.4 SS转HTTP(S)+SOCKS5+SS** 
+SPS上级和本地支持ss协议,上级可以是SPS或者标准的ss服务.  
+SPS本地默认提供HTTP(S)\SOCKS5\SPS三种代理,当上级是SOCKS5时转换后的SOCKS5和SS支持UDP功能.  
+假设已经存在一个普通的SS或者SPS代理(开启了ss,加密方式:aes-256-cfb,密码:demo)：127.0.0.1:8080,现在我们把它转为同时支持http(s)和socks5和ss的普通代理,转换后的本地端口为18080,转换后的ss加密方式:aes-192-cfb,ss密码:pass。  
+命令如下：  
+`./proxy sps -S ss -H aes-256-cfb -J pass -T tcp -P 127.0.0.1:8080 -t tcp -p :18080 -h aes-192-cfb -j pass`.  
+
+#### **6.5 链式连接**   
 ![6.4](/docs/images/sps-tls.png)  
 上面提过多个sps结点可以层级连接构建加密通道，假设有如下vps和家里的pc电脑。  
 vps01：2.2.2.2  
@ -902,11 +1085,11 @@ vps02：3.3.3.3

 完成。  

-#### **6.5 监听多个端口**   
+#### **6.6 监听多个端口**   
 一般情况下监听一个端口就可以，不过如果作为反向代理需要同时监听80和443两个端口，那么-p参数是支持的，  
 格式是：`-p 0.0.0.0:80,0.0.0.0:443`，多个绑定用逗号分隔即可。  

-#### **6.6 认证功能**   
+#### **6.7 认证功能**   
 sps支持http(s)\socks5代理认证,可以级联认证,有四个重要的信息:  
 1:用户发送认证信息`user-auth`。   
 2:设置的本地认证信息`local-auth`。  
@ -949,7 +1132,7 @@ target:如果客户端是http(s)代理请求,这里代表的是请求的完整ur
 如果没有-A参数,连接上级不使用认证.  


-#### **6.7 自定义加密**  
+#### **6.8 自定义加密**  
 proxy的sps代理在tcp之上可以通过tls标准加密以及kcp协议加密tcp数据,除此之外还支持在tls和kcp之后进行  
 自定义加密,也就是说自定义加密和tls|kcp是可以联合使用的,内部采用AES256加密,使用的时候只需要自己定义  
 一个密码即可,加密分为两个部分,一部分是本地(-z)是否加密解密,一部分是与上级(-Z)传输是否加密解密.      
@ -977,7 +1160,7 @@ proxy的sps代理在tcp之上可以通过tls标准加密以及kcp协议加密tcp
 `proxy sps -T tcp -P 3.3.3.3:8888 -Z other_password -t tcp -p :8080`  
 这样通过本地代理8080访问网站的时候就是通过与上级加密传输访问目标网站.  

-#### **6.8 压缩传输**  
+#### **6.9 压缩传输**  
 proxy的sps代理在tcp之上可以通过自定义加密和tls标准加密以及kcp协议加密tcp数据,在自定义加密之前还可以  
 对数据进行压缩,也就是说压缩功能和自定义加密和tls|kcp是可以联合使用的,压缩分为两个部分,   
 一部分是本地(-m)是否压缩传输,一部分是与上级(-M)传输是否压缩.    
@ -1003,8 +1186,7 @@ proxy的sps代理在tcp之上可以通过自定义加密和tls标准加密以及
 `proxy sps -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080`  
 这样通过本地代理8080访问网站的时候就是通过与上级压缩传输访问目标网站.  

-
-#### **6.9 禁用协议** 
+#### **6.10 禁用协议**  
 SPS默认情况下一个端口支持http(s)和socks5两种代理协议,我们可以通过参数禁用某个协议  
 比如:  
 1.禁用HTTP(S)代理功能只保留SOCKS5代理功能,参数:`--disable-http`.   
@ -1013,7 +1195,31 @@ SPS默认情况下一个端口支持http(s)和socks5两种代理协议,我们可
 1.禁用SOCKS5代理功能只保留HTTP(S)代理功能,参数:`--disable-socks`.   
 `proxy sps -T tcp -P 3.3.3.3:8888 -M -t tcp -p :8080 --disable-http`   

-#### **6.10 查看帮助** 
+#### **6.11 限速**  
+
+假设存在SOCKS5上级:
+
+`proxy socks -p 2.2.2.2:33080 -z password -t tcp`
+
+sps下级,限速100K
+
+`proxy sps -S socks -P 2.2.2.2:33080 -T tcp -Z password -l 100K -t tcp -p :33080`
+
+通过`-l`参数即可指定,比如:100K 1.5M . 0意味着无限制.
+
+#### **6.12 指定出口IP**  
+
+`--bind-listen`参数，就可以开启客户端用入口IP连接过来的,就用入口IP作为出口IP访问目标网站的功能。如果入口IP是内网IP，出口IP不会使用入口IP。
+
+`proxy sps -S socks -P 2.2.2.2:33080 -T tcp -Z password -l 100K -t tcp --bind-listen -p :33080`
+
+#### **6.13 证书参数使用base64数据**  
+
+默认情况下-C,-K参数是crt证书和key文件的路径,
+
+如果是base64://开头,那么就认为后面的数据是base64编码的,会解码后使用.
+
+#### **6.14 查看帮助** 
 `./proxy help sps`  

 ### **7.KCP配置**   
--- a/1
+++ b/1
@ -0,0 +1 @@
+6.1
--- a/config.go
+++ b/config.go
@ -4,28 +4,31 @@ import (
 	"bufio"
 	"crypto/sha1"
 	"fmt"
+	"io/ioutil"
 	logger "log"
 	"os"
 	"os/exec"
 	"path"
 	"path/filepath"
+	"runtime/debug"
 	"runtime/pprof"
+	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
 	sdk "github.com/snail007/goproxy/sdk/android-ios"
-	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
-
+	services "github.com/snail007/goproxy/services"
 	httpx "github.com/snail007/goproxy/services/http"
 	keygenx "github.com/snail007/goproxy/services/keygen"
 	mux "github.com/snail007/goproxy/services/mux"
 	socksx "github.com/snail007/goproxy/services/socks"
 	spsx "github.com/snail007/goproxy/services/sps"
 	tcpx "github.com/snail007/goproxy/services/tcp"
-	tunnel "github.com/snail007/goproxy/services/tunnel"
+	tunnelx "github.com/snail007/goproxy/services/tunnel"
 	udpx "github.com/snail007/goproxy/services/udp"
-
 	kcp "github.com/xtaci/kcp-go"
+
 	"golang.org/x/crypto/pbkdf2"
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 )
@ -42,9 +45,9 @@ func initConfig() (err error) {
 	//define  args
 	tcpArgs := tcpx.TCPArgs{}
 	httpArgs := httpx.HTTPArgs{}
-	tunnelServerArgs := tunnel.TunnelServerArgs{}
-	tunnelClientArgs := tunnel.TunnelClientArgs{}
-	tunnelBridgeArgs := tunnel.TunnelBridgeArgs{}
+	tunnelServerArgs := tunnelx.TunnelServerArgs{}
+	tunnelClientArgs := tunnelx.TunnelClientArgs{}
+	tunnelBridgeArgs := tunnelx.TunnelBridgeArgs{}
 	muxServerArgs := mux.MuxServerArgs{}
 	muxClientArgs := mux.MuxClientArgs{}
 	muxBridgeArgs := mux.MuxBridgeArgs{}
@ -54,14 +57,14 @@ func initConfig() (err error) {
 	dnsArgs := sdk.DNSArgs{}
 	keygenArgs := keygenx.KeygenArgs{}
 	kcpArgs := kcpcfg.KCPConfigArgs{}
-
 	//build srvice args
 	app = kingpin.New("proxy", "happy with proxy")
 	app.Author("snail").Version(APP_VERSION)
-	debug := app.Flag("debug", "debug log output").Default("false").Bool()
+	isDebug := app.Flag("debug", "debug log output").Default("false").Bool()
 	daemon := app.Flag("daemon", "run proxy in background").Default("false").Bool()
 	forever := app.Flag("forever", "run proxy in forever,fail and retry").Default("false").Bool()
 	logfile := app.Flag("log", "log file path").Default("").String()
+	nolog := app.Flag("nolog", "turn off logging").Default("false").Bool()
 	kcpArgs.Key = app.Flag("kcp-key", "pre-shared secret between client and server").Default("secrect").String()
 	kcpArgs.Crypt = app.Flag("kcp-method", "encrypt/decrypt method, can be: aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none").Default("aes").Enum("aes", "aes-128", "aes-192", "salsa20", "blowfish", "twofish", "cast5", "3des", "tea", "xtea", "xor", "sm4", "none")
 	kcpArgs.Mode = app.Flag("kcp-mode", "profiles: fast3, fast2, fast, normal, manual").Default("fast").Enum("fast3", "fast2", "fast", "normal", "manual")
@ -82,7 +85,7 @@ func initConfig() (err error) {

 	//########http#########
 	http := app.Command("http", "proxy on http mode")
-	httpArgs.Parent = http.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
+	httpArgs.Parent = http.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').Strings()
 	httpArgs.CaCertFile = http.Flag("ca", "ca cert file for tls").Default("").String()
 	httpArgs.CertFile = http.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	httpArgs.KeyFile = http.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
@ -113,7 +116,14 @@ func initConfig() (err error) {
 	httpArgs.ParentKey = http.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	httpArgs.LocalCompress = http.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	httpArgs.ParentCompress = http.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
-
+	httpArgs.LoadBalanceMethod = http.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	httpArgs.LoadBalanceTimeout = http.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	httpArgs.LoadBalanceRetryTime = http.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	httpArgs.LoadBalanceHashTarget = http.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	httpArgs.LoadBalanceOnlyHA = http.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	httpArgs.RateLimit = http.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	httpArgs.BindListen = http.Flag("bind-listen", "using listener binding IP when connect to target").Short('B').Default("false").Bool()
+	httpArgs.Debug = isDebug
 	//########tcp#########
 	tcp := app.Command("tcp", "proxy on tcp mode")
 	tcpArgs.Parent = tcp.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
@ -124,6 +134,7 @@ func initConfig() (err error) {
 	tcpArgs.LocalType = tcp.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	tcpArgs.CheckParentInterval = tcp.Flag("check-parent-interval", "check if proxy is okay every interval seconds,zero: means no check").Short('I').Default("3").Int()
 	tcpArgs.Local = tcp.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
+	tcpArgs.Jumper = tcp.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########udp#########
 	udp := app.Command("udp", "proxy on udp mode")
@ -138,7 +149,7 @@ func initConfig() (err error) {
 	//########mux-server#########
 	muxServer := app.Command("server", "proxy on mux server mode")
 	muxServerArgs.Parent = muxServer.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
-	muxServerArgs.ParentType = muxServer.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Default("tls").Short('T').Enum("tls", "tcp", "kcp")
+	muxServerArgs.ParentType = muxServer.Flag("parent-type", "parent protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('T').Enum("tls", "tcp", "tcps", "kcp", "tou")
 	muxServerArgs.CertFile = muxServer.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	muxServerArgs.KeyFile = muxServer.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxServerArgs.Timeout = muxServer.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
@ -147,17 +158,27 @@ func initConfig() (err error) {
 	muxServerArgs.Route = muxServer.Flag("route", "local route to client's network, such as: PROTOCOL://LOCAL_IP:LOCAL_PORT@[CLIENT_KEY]CLIENT_LOCAL_HOST:CLIENT_LOCAL_PORT").Short('r').Default("").Strings()
 	muxServerArgs.IsCompress = muxServer.Flag("c", "compress data when tcp|tls mode").Default("false").Bool()
 	muxServerArgs.SessionCount = muxServer.Flag("session-count", "session count which connect to bridge").Short('n').Default("10").Int()
+	muxServerArgs.Jumper = muxServer.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()
+	muxServerArgs.TCPSMethod = muxServer.Flag("tcps-method", "method of parent tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxServerArgs.TCPSPassword = muxServer.Flag("tcps-password", "password of parent tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxServerArgs.TOUMethod = muxServer.Flag("tou-method", "method of parent tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxServerArgs.TOUPassword = muxServer.Flag("tou-password", "password of parent tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########mux-client#########
 	muxClient := app.Command("client", "proxy on mux client mode")
 	muxClientArgs.Parent = muxClient.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
-	muxClientArgs.ParentType = muxClient.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Default("tls").Short('T').Enum("tls", "tcp", "kcp")
+	muxClientArgs.ParentType = muxClient.Flag("parent-type", "parent protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('T').Enum("tls", "tcp", "tcps", "kcp", "tou")
 	muxClientArgs.CertFile = muxClient.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	muxClientArgs.KeyFile = muxClient.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxClientArgs.Timeout = muxClient.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
 	muxClientArgs.Key = muxClient.Flag("k", "key same with server").Default("default").String()
 	muxClientArgs.IsCompress = muxClient.Flag("c", "compress data when tcp|tls mode").Default("false").Bool()
 	muxClientArgs.SessionCount = muxClient.Flag("session-count", "session count which connect to bridge").Short('n').Default("10").Int()
+	muxClientArgs.Jumper = muxClient.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()
+	muxClientArgs.TCPSMethod = muxClient.Flag("tcps-method", "method of parent tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxClientArgs.TCPSPassword = muxClient.Flag("tcps-password", "password of parent tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxClientArgs.TOUMethod = muxClient.Flag("tou-method", "method of parent tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxClientArgs.TOUPassword = muxClient.Flag("tou-password", "password of parent tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########mux-bridge#########
 	muxBridge := app.Command("bridge", "proxy on mux bridge mode")
@ -165,7 +186,11 @@ func initConfig() (err error) {
 	muxBridgeArgs.KeyFile = muxBridge.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxBridgeArgs.Timeout = muxBridge.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
 	muxBridgeArgs.Local = muxBridge.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
-	muxBridgeArgs.LocalType = muxBridge.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tls").Short('t').Enum("tls", "tcp", "kcp")
+	muxBridgeArgs.LocalType = muxBridge.Flag("local-type", "local protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('t').Enum("tls", "tcp", "tcps", "kcp", "tou")
+	muxBridgeArgs.TCPSMethod = muxBridge.Flag("tcps-method", "method of local tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxBridgeArgs.TCPSPassword = muxBridge.Flag("tcps-password", "password of local tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxBridgeArgs.TOUMethod = muxBridge.Flag("tou-method", "method of local tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxBridgeArgs.TOUPassword = muxBridge.Flag("tou-password", "password of local tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########tunnel-server#########
 	tunnelServer := app.Command("tserver", "proxy on tunnel server mode")
@ -176,6 +201,7 @@ func initConfig() (err error) {
 	tunnelServerArgs.IsUDP = tunnelServer.Flag("udp", "proxy on udp tunnel server mode").Default("false").Bool()
 	tunnelServerArgs.Key = tunnelServer.Flag("k", "client key").Default("default").String()
 	tunnelServerArgs.Route = tunnelServer.Flag("route", "local route to client's network, such as: PROTOCOL://LOCAL_IP:LOCAL_PORT@[CLIENT_KEY]CLIENT_LOCAL_HOST:CLIENT_LOCAL_PORT").Short('r').Default("").Strings()
+	tunnelServerArgs.Jumper = tunnelServer.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########tunnel-client#########
 	tunnelClient := app.Command("tclient", "proxy on tunnel client mode")
@ -184,6 +210,7 @@ func initConfig() (err error) {
 	tunnelClientArgs.KeyFile = tunnelClient.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	tunnelClientArgs.Timeout = tunnelClient.Flag("timeout", "tcp timeout with milliseconds").Short('t').Default("2000").Int()
 	tunnelClientArgs.Key = tunnelClient.Flag("k", "key same with server").Default("default").String()
+	tunnelClientArgs.Jumper = tunnelClient.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########tunnel-bridge#########
 	tunnelBridge := app.Command("tbridge", "proxy on tunnel bridge mode")
@ -194,7 +221,7 @@ func initConfig() (err error) {

 	//########ssh#########
 	socks := app.Command("socks", "proxy on ssh mode")
-	socksArgs.Parent = socks.Flag("parent", "parent ssh address, such as: \"23.32.32.19:22\"").Default("").Short('P').String()
+	socksArgs.Parent = socks.Flag("parent", "parent ssh address, such as: \"23.32.32.19:22\"").Default("").Short('P').Strings()
 	socksArgs.ParentType = socks.Flag("parent-type", "parent protocol type <tls|tcp|kcp|ssh>").Default("tcp").Short('T').Enum("tls", "tcp", "kcp", "ssh")
 	socksArgs.LocalType = socks.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	socksArgs.Local = socks.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
@ -204,7 +231,7 @@ func initConfig() (err error) {
 	socksArgs.SSHUser = socks.Flag("ssh-user", "user for ssh").Short('u').Default("").String()
 	socksArgs.SSHKeyFile = socks.Flag("ssh-key", "private key file for ssh").Short('S').Default("").String()
 	socksArgs.SSHKeyFileSalt = socks.Flag("ssh-keysalt", "salt of ssh private key").Short('s').Default("").String()
-	socksArgs.SSHPassword = socks.Flag("ssh-password", "password for ssh").Short('A').Default("").String()
+	socksArgs.SSHPassword = socks.Flag("ssh-password", "password for ssh").Short('D').Default("").String()
 	socksArgs.Always = socks.Flag("always", "always use parent proxy").Default("false").Bool()
 	socksArgs.Timeout = socks.Flag("timeout", "tcp timeout milliseconds when connect to real server or parent proxy").Default("5000").Int()
 	socksArgs.Interval = socks.Flag("interval", "check domain if blocked every interval seconds").Default("10").Int()
@ -217,16 +244,25 @@ func initConfig() (err error) {
 	socksArgs.AuthURLTimeout = socks.Flag("auth-timeout", "access 'auth-url' timeout milliseconds").Default("3000").Int()
 	socksArgs.AuthURLOkCode = socks.Flag("auth-code", "access 'auth-url' success http code").Default("204").Int()
 	socksArgs.AuthURLRetry = socks.Flag("auth-retry", "access 'auth-url' fail and retry count").Default("0").Int()
+	socksArgs.ParentAuth = socks.Flag("parent-auth", "parent socks auth username and password, such as: -A user1:pass1").Short('A').String()
 	socksArgs.DNSAddress = socks.Flag("dns-address", "if set this, proxy will use this dns for resolve doamin").Short('q').Default("").String()
 	socksArgs.DNSTTL = socks.Flag("dns-ttl", "caching seconds of dns query result").Short('e').Default("300").Int()
 	socksArgs.LocalKey = socks.Flag("local-key", "the password for auto encrypt/decrypt local connection data").Short('z').Default("").String()
 	socksArgs.ParentKey = socks.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	socksArgs.LocalCompress = socks.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	socksArgs.ParentCompress = socks.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
+	socksArgs.LoadBalanceMethod = socks.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	socksArgs.LoadBalanceTimeout = socks.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	socksArgs.LoadBalanceRetryTime = socks.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	socksArgs.LoadBalanceHashTarget = socks.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	socksArgs.LoadBalanceOnlyHA = socks.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	socksArgs.RateLimit = socks.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	socksArgs.BindListen = socks.Flag("bind-listen", "using listener binding IP when connect to target").Short('B').Default("false").Bool()
+	socksArgs.Debug = isDebug

 	//########socks+http(s)#########
 	sps := app.Command("sps", "proxy on socks+http(s) mode")
-	spsArgs.Parent = sps.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
+	spsArgs.Parent = sps.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').Strings()
 	spsArgs.CertFile = sps.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	spsArgs.KeyFile = sps.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	spsArgs.CaCertFile = sps.Flag("ca", "ca cert file for tls").Default("").String()
@ -234,7 +270,7 @@ func initConfig() (err error) {
 	spsArgs.ParentType = sps.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Short('T').Enum("tls", "tcp", "kcp")
 	spsArgs.LocalType = sps.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	spsArgs.Local = sps.Flag("local", "local ip:port to listen,multiple address use comma split,such as: 0.0.0.0:80,0.0.0.0:443").Short('p').Default(":33080").String()
-	spsArgs.ParentServiceType = sps.Flag("parent-service-type", "parent service type <http|socks>").Short('S').Enum("http", "socks")
+	spsArgs.ParentServiceType = sps.Flag("parent-service-type", "parent service type <http|socks|ss>").Short('S').Enum("http", "socks", "ss")
 	spsArgs.DNSAddress = sps.Flag("dns-address", "if set this, proxy will use this dns for resolve doamin").Short('q').Default("").String()
 	spsArgs.DNSTTL = sps.Flag("dns-ttl", "caching seconds of dns query result").Short('e').Default("300").Int()
 	spsArgs.AuthFile = sps.Flag("auth-file", "http basic auth file,\"username:password\" each line in file").Short('F').String()
@ -249,8 +285,20 @@ func initConfig() (err error) {
 	spsArgs.ParentKey = sps.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	spsArgs.LocalCompress = sps.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	spsArgs.ParentCompress = sps.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
+	spsArgs.SSMethod = sps.Flag("ss-method", "the following methods are supported: aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb, cast5-cfb, des-cfb, rc4-md5, rc4-md5-6, chacha20, salsa20, rc4, table, des-cfb, chacha20-ietf; if you use ss client , \"-t tcp\" is required").Short('h').Default("aes-256-cfb").String()
+	spsArgs.SSKey = sps.Flag("ss-key", "if you use ss client , \"-t tcp\" is required").Short('j').Default("sspassword").String()
+	spsArgs.ParentSSMethod = sps.Flag("parent-ss-method", "the following methods are supported: aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb, cast5-cfb, des-cfb, rc4-md5, rc4-md5-6, chacha20, salsa20, rc4, table, des-cfb, chacha20-ietf; if you use ss server as parent, \"-T tcp\" is required").Short('H').Default("aes-256-cfb").String()
+	spsArgs.ParentSSKey = sps.Flag("parent-ss-key", "if you use ss server as parent, \"-T tcp\" is required").Short('J').Default("sspassword").String()
 	spsArgs.DisableHTTP = sps.Flag("disable-http", "disable http(s) proxy").Default("false").Bool()
 	spsArgs.DisableSocks5 = sps.Flag("disable-socks", "disable socks proxy").Default("false").Bool()
+	spsArgs.DisableSS = sps.Flag("disable-ss", "disable ss proxy").Default("false").Bool()
+	spsArgs.LoadBalanceMethod = sps.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	spsArgs.LoadBalanceTimeout = sps.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	spsArgs.LoadBalanceRetryTime = sps.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	spsArgs.LoadBalanceHashTarget = sps.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	spsArgs.LoadBalanceOnlyHA = sps.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	spsArgs.RateLimit = sps.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	spsArgs.Debug = isDebug

 	//########dns#########
 	dns := app.Command("dns", "proxy on dns server mode")
@ -281,8 +329,6 @@ func initConfig() (err error) {
 	//parse args
 	serviceName := kingpin.MustParse(app.Parse(os.Args[1:]))

-	isDebug = *debug
-
 	//set kcp config

 	switch *kcpArgs.Mode {
@ -339,7 +385,7 @@ func initConfig() (err error) {
 	log := logger.New(os.Stderr, "", logger.Ldate|logger.Ltime)

 	flags := logger.Ldate
-	if *debug {
+	if *isDebug {
 		flags |= logger.Lshortfile | logger.Lmicroseconds
 		cpuProfilingFile, _ = os.Create("cpu.prof")
 		memProfilingFile, _ = os.Create("memory.prof")
@ -351,8 +397,9 @@ func initConfig() (err error) {
 		flags |= logger.Ltime
 	}
 	log.SetFlags(flags)
-
-	if *logfile != "" {
+	if *nolog {
+		log.SetOutput(ioutil.Discard)
+	} else if *logfile != "" {
 		f, e := os.OpenFile(*logfile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
 		if e != nil {
 			log.Fatal(e)
@ -383,9 +430,15 @@ func initConfig() (err error) {
 			}
 		}
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			for {
 				if cmd != nil {
 					cmd.Process.Kill()
+					time.Sleep(time.Second * 5)
 				}
 				cmd = exec.Command(os.Args[0], args...)
 				cmdReaderStderr, err := cmd.StderrPipe()
@ -401,11 +454,21 @@ func initConfig() (err error) {
 				scanner := bufio.NewScanner(cmdReader)
 				scannerStdErr := bufio.NewScanner(cmdReaderStderr)
 				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+						}
+					}()
 					for scanner.Scan() {
 						fmt.Println(scanner.Text())
 					}
 				}()
 				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+						}
+					}()
 					for scannerStdErr.Scan() {
 						fmt.Println(scannerStdErr.Text())
 					}
@ -421,14 +484,13 @@ func initConfig() (err error) {
 					continue
 				}
 				log.Printf("worker %s [PID] %d unexpected exited, restarting...\n", os.Args[0], pid)
-				time.Sleep(time.Second * 5)
 			}
 		}()
 		return
 	}
 	if *logfile == "" {
 		poster()
-		if *debug {
+		if *isDebug {
 			log.Println("[profiling] cpu profiling save to file : cpu.prof")
 			log.Println("[profiling] memory profiling save to file : memory.prof")
 			log.Println("[profiling] block profiling save to file : block.prof")
@ -436,7 +498,7 @@ func initConfig() (err error) {
 			log.Println("[profiling] threadcreate profiling save to file : threadcreate.prof")
 		}
 	}
-	//regist services and run service
+
 	//regist services and run service
 	switch serviceName {
 	case "http":
@ -446,11 +508,11 @@ func initConfig() (err error) {
 	case "udp":
 		services.Regist(serviceName, udpx.NewUDP(), udpArgs, log)
 	case "tserver":
-		services.Regist(serviceName, tunnel.NewTunnelServerManager(), tunnelServerArgs, log)
+		services.Regist(serviceName, tunnelx.NewTunnelServerManager(), tunnelServerArgs, log)
 	case "tclient":
-		services.Regist(serviceName, tunnel.NewTunnelClient(), tunnelClientArgs, log)
+		services.Regist(serviceName, tunnelx.NewTunnelClient(), tunnelClientArgs, log)
 	case "tbridge":
-		services.Regist(serviceName, tunnel.NewTunnelBridge(), tunnelBridgeArgs, log)
+		services.Regist(serviceName, tunnelx.NewTunnelBridge(), tunnelBridgeArgs, log)
 	case "server":
 		services.Regist(serviceName, mux.NewMuxServerManager(), muxServerArgs, log)
 	case "client":
@ -466,7 +528,6 @@ func initConfig() (err error) {
 	case "keygen":
 		services.Regist(serviceName, keygenx.NewKeygen(), keygenArgs, log)
 	}
-
 	service, err = services.Run(serviceName, nil)
 	if err != nil {
 		log.Fatalf("run service [%s] fail, ERR:%s", serviceName, err)
@ -475,16 +536,7 @@ func initConfig() (err error) {
 }

 func poster() {
-	fmt.Printf(`
-		########  ########   #######  ##     ## ##    ## 
-		##     ## ##     ## ##     ##  ##   ##   ##  ##  
-		##     ## ##     ## ##     ##   ## ##     ####   
-		########  ########  ##     ##    ###       ##    
-		##        ##   ##   ##     ##   ## ##      ##    
-		##        ##    ##  ##     ##  ##   ##     ##    
-		##        ##     ##  #######  ##     ##    ##    
-		
-		v%s`+" by snail , blog : http://www.host900.com/\n\n", APP_VERSION)
+	fmt.Printf(`Proxy Enterprise Version v%s`+" by snail , blog : http://www.host900.com/\n\n", APP_VERSION)
 }
 func saveProfiling() {
 	goroutine := pprof.Lookup("goroutine")
--- a/core/cs/client/client.go
+++ b/core/cs/client/client.go
@ -0,0 +1,135 @@
+package client
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/snail007/goproxy/core/dst"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	compressconn "github.com/snail007/goproxy/core/lib/transport"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
+	kcp "github.com/xtaci/kcp-go"
+)
+
+func TlsConnectHost(host string, timeout int, certBytes, keyBytes, caCertBytes []byte) (conn tls.Conn, err error) {
+	h := strings.Split(host, ":")
+	port, _ := strconv.Atoi(h[1])
+	return TlsConnect(h[0], port, timeout, certBytes, keyBytes, caCertBytes)
+}
+
+func TlsConnect(host string, port, timeout int, certBytes, keyBytes, caCertBytes []byte) (conn tls.Conn, err error) {
+	conf, err := getRequestTlsConfig(certBytes, keyBytes, caCertBytes)
+	if err != nil {
+		return
+	}
+	_conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", host, port), time.Duration(timeout)*time.Millisecond)
+	if err != nil {
+		return
+	}
+	return *tls.Client(_conn, conf), err
+}
+func TlsConfig(certBytes, keyBytes, caCertBytes []byte) (conf *tls.Config, err error) {
+	return getRequestTlsConfig(certBytes, keyBytes, caCertBytes)
+}
+func getRequestTlsConfig(certBytes, keyBytes, caCertBytes []byte) (conf *tls.Config, err error) {
+
+	var cert tls.Certificate
+	cert, err = tls.X509KeyPair(certBytes, keyBytes)
+	if err != nil {
+		return
+	}
+	serverCertPool := x509.NewCertPool()
+	caBytes := certBytes
+	if caCertBytes != nil {
+		caBytes = caCertBytes
+
+	}
+	ok := serverCertPool.AppendCertsFromPEM(caBytes)
+	if !ok {
+		err = errors.New("failed to parse root certificate")
+	}
+	block, _ := pem.Decode(caBytes)
+	if block == nil {
+		panic("failed to parse certificate PEM")
+	}
+	x509Cert, _ := x509.ParseCertificate(block.Bytes)
+	if x509Cert == nil {
+		panic("failed to parse block")
+	}
+	conf = &tls.Config{
+		RootCAs:            serverCertPool,
+		Certificates:       []tls.Certificate{cert},
+		InsecureSkipVerify: true,
+		ServerName:         x509Cert.Subject.CommonName,
+		VerifyPeerCertificate: func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
+			opts := x509.VerifyOptions{
+				Roots: serverCertPool,
+			}
+			for _, rawCert := range rawCerts {
+				cert, _ := x509.ParseCertificate(rawCert)
+				_, err := cert.Verify(opts)
+				if err != nil {
+					return err
+				}
+			}
+			return nil
+		},
+	}
+	return
+}
+
+func TCPConnectHost(hostAndPort string, timeout int) (conn net.Conn, err error) {
+	conn, err = net.DialTimeout("tcp", hostAndPort, time.Duration(timeout)*time.Millisecond)
+	return
+}
+
+func TCPSConnectHost(hostAndPort string, method, password string, compress bool, timeout int) (conn net.Conn, err error) {
+	conn, err = net.DialTimeout("tcp", hostAndPort, time.Duration(timeout)*time.Millisecond)
+	if err != nil {
+		return
+	}
+	if compress {
+		conn = compressconn.NewCompConn(conn)
+	}
+	conn, err = encryptconn.NewConn(conn, method, password)
+	return
+}
+
+func TOUConnectHost(hostAndPort string, method, password string, compress bool, timeout int) (conn net.Conn, err error) {
+	udpConn, err := net.ListenUDP("udp", &net.UDPAddr{})
+	if err != nil {
+		panic(err)
+	}
+	// Create a DST mux around the packet connection with the default max
+	// packet size.
+	mux := dst.NewMux(udpConn, 0)
+	conn, err = mux.Dial("dst", hostAndPort)
+	if compress {
+		conn = compressconn.NewCompConn(conn)
+	}
+	conn, err = encryptconn.NewConn(conn, method, password)
+	return
+}
+func KCPConnectHost(hostAndPort string, config kcpcfg.KCPConfigArgs) (conn net.Conn, err error) {
+	kcpconn, err := kcp.DialWithOptions(hostAndPort, config.Block, *config.DataShard, *config.ParityShard)
+	if err != nil {
+		return
+	}
+	kcpconn.SetStreamMode(true)
+	kcpconn.SetWriteDelay(true)
+	kcpconn.SetNoDelay(*config.NoDelay, *config.Interval, *config.Resend, *config.NoCongestion)
+	kcpconn.SetMtu(*config.MTU)
+	kcpconn.SetWindowSize(*config.SndWnd, *config.RcvWnd)
+	kcpconn.SetACKNoDelay(*config.AckNodelay)
+	if *config.NoComp {
+		return kcpconn, err
+	}
+	return compressconn.NewCompStream(kcpconn), err
+}
--- a/core/cs/server/server.go
+++ b/core/cs/server/server.go
@ -0,0 +1,341 @@
+package server
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+
+	logger "log"
+	"net"
+	"runtime/debug"
+	"strconv"
+
+	tou "github.com/snail007/goproxy/core/dst"
+	compressconn "github.com/snail007/goproxy/core/lib/transport"
+	transportc "github.com/snail007/goproxy/core/lib/transport"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
+
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+
+	kcp "github.com/xtaci/kcp-go"
+)
+
+func init() {
+
+}
+
+type ServerChannel struct {
+	ip               string
+	port             int
+	Listener         *net.Listener
+	UDPListener      *net.UDPConn
+	errAcceptHandler func(err error)
+	log              *logger.Logger
+	TOUServer        *tou.Mux
+}
+
+func NewServerChannel(ip string, port int, log *logger.Logger) ServerChannel {
+	return ServerChannel{
+		ip:   ip,
+		port: port,
+		log:  log,
+		errAcceptHandler: func(err error) {
+			log.Printf("accept error , ERR:%s", err)
+		},
+	}
+}
+func NewServerChannelHost(host string, log *logger.Logger) ServerChannel {
+	h, port, _ := net.SplitHostPort(host)
+	p, _ := strconv.Atoi(port)
+	return ServerChannel{
+		ip:   h,
+		port: p,
+		log:  log,
+		errAcceptHandler: func(err error) {
+			log.Printf("accept error , ERR:%s", err)
+		},
+	}
+}
+func (s *ServerChannel) SetErrAcceptHandler(fn func(err error)) {
+	s.errAcceptHandler = fn
+}
+func (s *ServerChannel) ListenSingleTLS(certBytes, keyBytes, caCertBytes []byte, fn func(conn net.Conn)) (err error) {
+	return s._ListenTLS(certBytes, keyBytes, caCertBytes, fn, true)
+
+}
+func (s *ServerChannel) ListenTLS(certBytes, keyBytes, caCertBytes []byte, fn func(conn net.Conn)) (err error) {
+	return s._ListenTLS(certBytes, keyBytes, caCertBytes, fn, false)
+}
+func (s *ServerChannel) _ListenTLS(certBytes, keyBytes, caCertBytes []byte, fn func(conn net.Conn), single bool) (err error) {
+	s.Listener, err = s.listenTLS(s.ip, s.port, certBytes, keyBytes, caCertBytes, single)
+	if err == nil {
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					s.log.Printf("ListenTLS crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+				}
+			}()
+			for {
+				var conn net.Conn
+				conn, err = (*s.Listener).Accept()
+				if err == nil {
+					go func() {
+						defer func() {
+							if e := recover(); e != nil {
+								s.log.Printf("tls connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+							}
+						}()
+						fn(conn)
+					}()
+				} else {
+					s.errAcceptHandler(err)
+					(*s.Listener).Close()
+					break
+				}
+			}
+		}()
+	}
+	return
+}
+func (s *ServerChannel) listenTLS(ip string, port int, certBytes, keyBytes, caCertBytes []byte, single bool) (ln *net.Listener, err error) {
+	var cert tls.Certificate
+	cert, err = tls.X509KeyPair(certBytes, keyBytes)
+	if err != nil {
+		return
+	}
+	config := &tls.Config{
+		Certificates: []tls.Certificate{cert},
+	}
+	if !single {
+		clientCertPool := x509.NewCertPool()
+		caBytes := certBytes
+		if caCertBytes != nil {
+			caBytes = caCertBytes
+		}
+		ok := clientCertPool.AppendCertsFromPEM(caBytes)
+		if !ok {
+			err = errors.New("failed to parse root certificate")
+		}
+		config.ClientCAs = clientCertPool
+		config.ClientAuth = tls.RequireAndVerifyClientCert
+	}
+	_ln, err := tls.Listen("tcp", net.JoinHostPort(ip, fmt.Sprintf("%d", port)), config)
+	if err == nil {
+		ln = &_ln
+	}
+	return
+}
+func (s *ServerChannel) ListenTCPS(method, password string, compress bool, fn func(conn net.Conn)) (err error) {
+	_, err = encryptconn.NewCipher(method, password)
+	if err != nil {
+		return
+	}
+	return s.ListenTCP(func(c net.Conn) {
+		if compress {
+			c = transportc.NewCompConn(c)
+		}
+		c, _ = encryptconn.NewConn(c, method, password)
+		fn(c)
+	})
+}
+func (s *ServerChannel) ListenTCP(fn func(conn net.Conn)) (err error) {
+	var l net.Listener
+	l, err = net.Listen("tcp", net.JoinHostPort(s.ip, fmt.Sprintf("%d", s.port)))
+	if err == nil {
+		s.Listener = &l
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					s.log.Printf("ListenTCP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+				}
+			}()
+			for {
+				var conn net.Conn
+				conn, err = (*s.Listener).Accept()
+				if err == nil {
+					go func() {
+						defer func() {
+							if e := recover(); e != nil {
+								s.log.Printf("tcp connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+							}
+						}()
+						fn(conn)
+					}()
+				} else {
+					s.errAcceptHandler(err)
+					(*s.Listener).Close()
+					break
+				}
+			}
+		}()
+	}
+	return
+}
+func (s *ServerChannel) ListenUDP(fn func(listener *net.UDPConn, packet []byte, localAddr, srcAddr *net.UDPAddr)) (err error) {
+	addr := &net.UDPAddr{IP: net.ParseIP(s.ip), Port: s.port}
+	l, err := net.ListenUDP("udp", addr)
+	if err == nil {
+		s.UDPListener = l
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					s.log.Printf("ListenUDP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+				}
+			}()
+			for {
+				var buf = make([]byte, 2048)
+				n, srcAddr, err := (*s.UDPListener).ReadFromUDP(buf)
+				if err == nil {
+					packet := buf[0:n]
+					go func() {
+						defer func() {
+							if e := recover(); e != nil {
+								s.log.Printf("udp data handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+							}
+						}()
+						fn(s.UDPListener, packet, addr, srcAddr)
+					}()
+				} else {
+					s.errAcceptHandler(err)
+					(*s.UDPListener).Close()
+					break
+				}
+			}
+		}()
+	}
+	return
+}
+func (s *ServerChannel) ListenKCP(config kcpcfg.KCPConfigArgs, fn func(conn net.Conn), log *logger.Logger) (err error) {
+	lis, err := kcp.ListenWithOptions(net.JoinHostPort(s.ip, fmt.Sprintf("%d", s.port)), config.Block, *config.DataShard, *config.ParityShard)
+	if err == nil {
+		if err = lis.SetDSCP(*config.DSCP); err != nil {
+			log.Println("SetDSCP:", err)
+			return
+		}
+		if err = lis.SetReadBuffer(*config.SockBuf); err != nil {
+			log.Println("SetReadBuffer:", err)
+			return
+		}
+		if err = lis.SetWriteBuffer(*config.SockBuf); err != nil {
+			log.Println("SetWriteBuffer:", err)
+			return
+		}
+		s.Listener = new(net.Listener)
+		*s.Listener = lis
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					s.log.Printf("ListenKCP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+				}
+			}()
+			for {
+				conn, err := lis.AcceptKCP()
+				if err == nil {
+					go func() {
+						defer func() {
+							if e := recover(); e != nil {
+								s.log.Printf("kcp connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+							}
+						}()
+						conn.SetStreamMode(true)
+						conn.SetWriteDelay(true)
+						conn.SetNoDelay(*config.NoDelay, *config.Interval, *config.Resend, *config.NoCongestion)
+						conn.SetMtu(*config.MTU)
+						conn.SetWindowSize(*config.SndWnd, *config.RcvWnd)
+						conn.SetACKNoDelay(*config.AckNodelay)
+						if *config.NoComp {
+							fn(conn)
+						} else {
+							cconn := transportc.NewCompStream(conn)
+							fn(cconn)
+						}
+					}()
+				} else {
+					s.errAcceptHandler(err)
+					(*s.Listener).Close()
+					break
+				}
+			}
+		}()
+	}
+	return
+}
+
+func (s *ServerChannel) ListenTOU(method, password string, compress bool, fn func(conn net.Conn)) (err error) {
+	addr := &net.UDPAddr{IP: net.ParseIP(s.ip), Port: s.port}
+	s.UDPListener, err = net.ListenUDP("udp", addr)
+	if err != nil {
+		s.log.Println(err)
+		return
+	}
+	s.TOUServer = tou.NewMux(s.UDPListener, 0)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				s.log.Printf("ListenRUDP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+			}
+		}()
+		for {
+			var conn net.Conn
+			conn, err = (*s.TOUServer).Accept()
+			if err == nil {
+				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							s.log.Printf("tcp connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
+						}
+					}()
+					if compress {
+						conn = compressconn.NewCompConn(conn)
+					}
+					conn, err = encryptconn.NewConn(conn, method, password)
+					if err != nil {
+						conn.Close()
+						s.log.Println(err)
+						return
+					}
+					fn(conn)
+				}()
+			} else {
+				s.errAcceptHandler(err)
+				s.TOUServer.Close()
+				s.UDPListener.Close()
+				break
+			}
+		}
+	}()
+
+	return
+}
+func (s *ServerChannel) Close() {
+	defer func() {
+		if e := recover(); e != nil {
+			s.log.Printf("close crashed :\n%s\n%s", e, string(debug.Stack()))
+		}
+	}()
+	if s.Listener != nil && *s.Listener != nil {
+		(*s.Listener).Close()
+	}
+	if s.TOUServer != nil {
+		s.TOUServer.Close()
+	}
+	if s.UDPListener != nil {
+		s.UDPListener.Close()
+	}
+}
+func (s *ServerChannel) Addr() string {
+	defer func() {
+		if e := recover(); e != nil {
+			s.log.Printf("close crashed :\n%s\n%s", e, string(debug.Stack()))
+		}
+	}()
+	if s.Listener != nil && *s.Listener != nil {
+		return (*s.Listener).Addr().String()
+	}
+
+	if s.UDPListener != nil {
+		return s.UDPListener.LocalAddr().String()
+	}
+	return ""
+}
--- a/core/cs/tests/transport_test.go
+++ b/core/cs/tests/transport_test.go
@ -0,0 +1,49 @@
+package tests
+
+import (
+	"log"
+	"net"
+	"os"
+	"testing"
+
+	ctransport "github.com/snail007/goproxy/core/cs/client"
+	stransport "github.com/snail007/goproxy/core/cs/server"
+)
+
+func TestTCPS(t *testing.T) {
+	l := log.New(os.Stderr, "", log.LstdFlags)
+	s := stransport.NewServerChannelHost(":", l)
+	err := s.ListenTCPS("aes-256-cfb", "password", true, func(inconn net.Conn) {
+		buf := make([]byte, 2048)
+		_, err := inconn.Read(buf)
+		if err != nil {
+			t.Error(err)
+			return
+		}
+		_, err = inconn.Write([]byte("okay"))
+		if err != nil {
+			t.Error(err)
+			return
+		}
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	client, err := ctransport.TCPSConnectHost((*s.Listener).Addr().String(), "aes-256-cfb", "password", true, 1000)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+	_, err = client.Write([]byte("test"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	b := make([]byte, 20)
+	n, err := client.Read(b)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(b[:n]) != "okay" {
+		t.Fatalf("client revecive okay excepted,revecived : %s", string(b[:n]))
+	}
+}
--- a/core/dst/conn.go
+++ b/core/dst/conn.go
@ -0,0 +1,603 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"bytes"
+	crand "crypto/rand"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"runtime/debug"
+
+	"math/rand"
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+const (
+	defExpTime       = 100 * time.Millisecond // N * (4 * RTT + RTTVar + SYN)
+	expCountClose    = 8                      // close connection after this many Exps
+	minTimeClose     = 5 * time.Second        // if at least this long has passed
+	maxInputBuffer   = 8 << 20                // bytes
+	muxBufferPackets = 128                    // buffer size of channel between mux and reader routine
+	rttMeasureWindow = 32                     // number of packets to track for RTT averaging
+	rttMeasureSample = 128                    // Sample every ... packet for RTT
+
+	// number of bytes to subtract from MTU when chunking data, to try to
+	// avoid fragmentation
+	sliceOverhead = 8 /*pppoe, similar*/ + 20 /*ipv4*/ + 8 /*udp*/ + 16 /*dst*/
+)
+
+func init() {
+	// Properly seed the random number generator that we use for sequence
+	// numbers and stuff.
+	buf := make([]byte, 8)
+	if n, err := crand.Read(buf); n != 8 || err != nil {
+		panic("init random failure")
+	}
+	rand.Seed(int64(binary.BigEndian.Uint64(buf)))
+}
+
+// TODO: export this interface when it's usable from the outside
+type congestionController interface {
+	Ack()
+	NegAck()
+	Exp()
+	SendWindow() int
+	PacketRate() int // PPS
+	UpdateRTT(time.Duration)
+}
+
+// Conn is an SDT connection carried over a Mux.
+type Conn struct {
+	// Set at creation, thereafter immutable:
+
+	mux          *Mux
+	dst          net.Addr
+	connID       connectionID
+	remoteConnID connectionID
+	in           chan packet
+	cc           congestionController
+	packetSize   int
+	closed       chan struct{}
+	closeOnce    sync.Once
+
+	// Touched by more than one goroutine, needs locking.
+
+	nextSeqNoMut sync.Mutex
+	nextSeqNo    sequenceNo
+
+	inbufMut  sync.Mutex
+	inbufCond *sync.Cond
+	inbuf     bytes.Buffer
+
+	expMut sync.Mutex
+	exp    *time.Timer
+
+	sendBuffer *sendBuffer // goroutine safe
+
+	packetDelays     [rttMeasureWindow]time.Duration
+	packetDelaysSlot int
+	packetDelaysMut  sync.Mutex
+
+	// Owned by the reader routine, needs no locking
+
+	recvBuffer        packetList
+	nextRecvSeqNo     sequenceNo
+	lastAckedSeqNo    sequenceNo
+	lastNegAckedSeqNo sequenceNo
+	expCount          int
+	expReset          time.Time
+
+	// Only accessed atomically
+
+	packetsIn         int64
+	packetsOut        int64
+	bytesIn           int64
+	bytesOut          int64
+	resentPackets     int64
+	droppedPackets    int64
+	outOfOrderPackets int64
+
+	// Special
+
+	debugResetRecvSeqNo chan sequenceNo
+}
+
+func newConn(m *Mux, dst net.Addr) *Conn {
+	conn := &Conn{
+		mux:                 m,
+		dst:                 dst,
+		nextSeqNo:           sequenceNo(rand.Uint32()),
+		packetSize:          maxPacketSize,
+		in:                  make(chan packet, muxBufferPackets),
+		closed:              make(chan struct{}),
+		sendBuffer:          newSendBuffer(m),
+		exp:                 time.NewTimer(defExpTime),
+		debugResetRecvSeqNo: make(chan sequenceNo),
+		expReset:            time.Now(),
+	}
+
+	conn.lastAckedSeqNo = conn.nextSeqNo - 1
+	conn.inbufCond = sync.NewCond(&conn.inbufMut)
+
+	conn.cc = newWindowCC()
+	conn.sendBuffer.SetWindowAndRate(conn.cc.SendWindow(), conn.cc.PacketRate())
+	conn.recvBuffer.Resize(128)
+
+	return conn
+}
+
+func (c *Conn) start() {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+			}
+		}()
+		c.reader()
+	}()
+}
+
+func (c *Conn) reader() {
+	if debugConnection {
+		log.Println(c, "reader() starting")
+		defer log.Println(c, "reader() exiting")
+	}
+
+	for {
+		select {
+		case <-c.closed:
+			// Ack any received but not yet acked messages.
+			c.sendAck(0)
+
+			// Send a shutdown message.
+			c.nextSeqNoMut.Lock()
+			c.mux.write(packet{
+				src: c.connID,
+				dst: c.dst,
+				hdr: header{
+					packetType: typeShutdown,
+					connID:     c.remoteConnID,
+					sequenceNo: c.nextSeqNo,
+				},
+			})
+			c.nextSeqNo++
+			c.nextSeqNoMut.Unlock()
+			atomic.AddInt64(&c.packetsOut, 1)
+			atomic.AddInt64(&c.bytesOut, dstHeaderLen)
+			return
+
+		case pkt := <-c.in:
+			atomic.AddInt64(&c.packetsIn, 1)
+			atomic.AddInt64(&c.bytesIn, dstHeaderLen+int64(len(pkt.data)))
+
+			c.expCount = 1
+
+			switch pkt.hdr.packetType {
+			case typeData:
+				c.rcvData(pkt)
+			case typeAck:
+				c.rcvAck(pkt)
+			case typeNegAck:
+				c.rcvNegAck(pkt)
+			case typeShutdown:
+				c.rcvShutdown(pkt)
+			default:
+				log.Println("Unhandled packet", pkt)
+				continue
+			}
+
+		case <-c.exp.C:
+			c.eventExp()
+			c.resetExp()
+
+		case n := <-c.debugResetRecvSeqNo:
+			// Back door for testing
+			c.lastAckedSeqNo = n - 1
+			c.nextRecvSeqNo = n
+		}
+	}
+}
+
+func (c *Conn) eventExp() {
+	c.expCount++
+
+	if c.sendBuffer.lost.Len() > 0 || c.sendBuffer.send.Len() > 0 {
+		c.cc.Exp()
+		c.sendBuffer.SetWindowAndRate(c.cc.SendWindow(), c.cc.PacketRate())
+		c.sendBuffer.ScheduleResend()
+
+		if debugConnection {
+			log.Println(c, "did resends due to Exp")
+		}
+
+		if c.expCount > expCountClose && time.Since(c.expReset) > minTimeClose {
+			if debugConnection {
+				log.Println(c, "close due to Exp")
+			}
+
+			// We're shutting down due to repeated exp:s. Don't wait for the
+			// send buffer to drain, which it would otherwise do in
+			// c.Close()..
+			c.sendBuffer.CrashStop()
+
+			c.Close()
+		}
+	}
+}
+
+func (c *Conn) rcvAck(pkt packet) {
+	ack := pkt.hdr.sequenceNo
+
+	if debugConnection {
+		log.Printf("%v read Ack %v", c, ack)
+	}
+
+	c.cc.Ack()
+
+	if ack%rttMeasureSample == 0 {
+		if ts := timestamp(binary.BigEndian.Uint32(pkt.data)); ts > 0 {
+			if delay := time.Duration(timestampMicros()-ts) * time.Microsecond; delay > 0 {
+				c.packetDelaysMut.Lock()
+				c.packetDelays[c.packetDelaysSlot] = delay
+				c.packetDelaysSlot = (c.packetDelaysSlot + 1) % len(c.packetDelays)
+				c.packetDelaysMut.Unlock()
+
+				if rtt, n := c.averageDelay(); n > 8 {
+					c.cc.UpdateRTT(rtt)
+				}
+			}
+		}
+	}
+
+	c.sendBuffer.Acknowledge(ack)
+	c.sendBuffer.SetWindowAndRate(c.cc.SendWindow(), c.cc.PacketRate())
+
+	c.resetExp()
+}
+
+func (c *Conn) averageDelay() (time.Duration, int) {
+	var total time.Duration
+	var n int
+
+	c.packetDelaysMut.Lock()
+	for _, d := range c.packetDelays {
+		if d != 0 {
+			total += d
+			n++
+		}
+	}
+	c.packetDelaysMut.Unlock()
+
+	if n == 0 {
+		return 0, 0
+	}
+	return total / time.Duration(n), n
+}
+
+func (c *Conn) rcvNegAck(pkt packet) {
+	nak := pkt.hdr.sequenceNo
+
+	if debugConnection {
+		log.Printf("%v read NegAck %v", c, nak)
+	}
+
+	c.sendBuffer.NegativeAck(nak)
+
+	//c.cc.NegAck()
+	c.resetExp()
+}
+
+func (c *Conn) rcvShutdown(pkt packet) {
+	// XXX: We accept shutdown packets somewhat from the future since the
+	// sender will number the shutdown after any packets that might still be
+	// in the write buffer. This should be fixed to let the write buffer empty
+	// on close and reduce the window here.
+	if pkt.LessSeq(c.nextRecvSeqNo + 128) {
+		if debugConnection {
+			log.Println(c, "close due to shutdown")
+		}
+		c.Close()
+	}
+}
+
+func (c *Conn) rcvData(pkt packet) {
+	if debugConnection {
+		log.Println(c, "recv data", pkt.hdr)
+	}
+
+	if pkt.LessSeq(c.nextRecvSeqNo) {
+		if debugConnection {
+			log.Printf("%v old packet received; seq %v, expected %v", c, pkt.hdr.sequenceNo, c.nextRecvSeqNo)
+		}
+		atomic.AddInt64(&c.droppedPackets, 1)
+		return
+	}
+
+	if debugConnection {
+		log.Println(c, "into recv buffer:", pkt)
+	}
+	c.recvBuffer.InsertSorted(pkt)
+	if c.recvBuffer.LowestSeq() == c.nextRecvSeqNo {
+		for _, pkt := range c.recvBuffer.PopSequence(^sequenceNo(0)) {
+			if debugConnection {
+				log.Println(c, "from recv buffer:", pkt)
+			}
+
+			// An in-sequence packet.
+
+			c.nextRecvSeqNo = pkt.hdr.sequenceNo + 1
+
+			c.sendAck(pkt.hdr.timestamp)
+
+			c.inbufMut.Lock()
+			for c.inbuf.Len() > len(pkt.data)+maxInputBuffer {
+				c.inbufCond.Wait()
+				select {
+				case <-c.closed:
+					return
+				default:
+				}
+			}
+
+			c.inbuf.Write(pkt.data)
+			c.inbufCond.Broadcast()
+			c.inbufMut.Unlock()
+		}
+	} else {
+		if debugConnection {
+			log.Printf("%v lost; seq %v, expected %v", c, pkt.hdr.sequenceNo, c.nextRecvSeqNo)
+		}
+		c.recvBuffer.InsertSorted(pkt)
+		c.sendNegAck()
+		atomic.AddInt64(&c.outOfOrderPackets, 1)
+	}
+}
+
+func (c *Conn) sendAck(ts timestamp) {
+	if c.lastAckedSeqNo == c.nextRecvSeqNo {
+		return
+	}
+
+	var buf [4]byte
+	binary.BigEndian.PutUint32(buf[:], uint32(ts))
+	c.mux.write(packet{
+		src: c.connID,
+		dst: c.dst,
+		hdr: header{
+			packetType: typeAck,
+			connID:     c.remoteConnID,
+			sequenceNo: c.nextRecvSeqNo,
+		},
+		data: buf[:],
+	})
+
+	atomic.AddInt64(&c.packetsOut, 1)
+	atomic.AddInt64(&c.bytesOut, dstHeaderLen)
+	if debugConnection {
+		log.Printf("%v send Ack %v", c, c.nextRecvSeqNo)
+	}
+
+	c.lastAckedSeqNo = c.nextRecvSeqNo
+}
+
+func (c *Conn) sendNegAck() {
+	if c.lastNegAckedSeqNo == c.nextRecvSeqNo {
+		return
+	}
+
+	c.mux.write(packet{
+		src: c.connID,
+		dst: c.dst,
+		hdr: header{
+			packetType: typeNegAck,
+			connID:     c.remoteConnID,
+			sequenceNo: c.nextRecvSeqNo,
+		},
+	})
+
+	atomic.AddInt64(&c.packetsOut, 1)
+	atomic.AddInt64(&c.bytesOut, dstHeaderLen)
+	if debugConnection {
+		log.Printf("%v send NegAck %v", c, c.nextRecvSeqNo)
+	}
+
+	c.lastNegAckedSeqNo = c.nextRecvSeqNo
+}
+
+func (c *Conn) resetExp() {
+	d, _ := c.averageDelay()
+	d = d*4 + 10*time.Millisecond
+
+	if d < defExpTime {
+		d = defExpTime
+	}
+
+	c.expMut.Lock()
+	c.exp.Reset(d)
+	c.expMut.Unlock()
+}
+
+// String returns a string representation of the connection.
+func (c *Conn) String() string {
+	return fmt.Sprintf("%v/%v/%v", c.connID, c.LocalAddr(), c.RemoteAddr())
+}
+
+// Read reads data from the connection.
+// Read can be made to time out and return a Error with Timeout() == true
+// after a fixed time limit; see SetDeadline and SetReadDeadline.
+func (c *Conn) Read(b []byte) (n int, err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			n = 0
+			err = io.EOF
+		}
+	}()
+	c.inbufMut.Lock()
+	defer c.inbufMut.Unlock()
+	for c.inbuf.Len() == 0 {
+		select {
+		case <-c.closed:
+			return 0, io.EOF
+		default:
+		}
+		c.inbufCond.Wait()
+	}
+	return c.inbuf.Read(b)
+}
+
+// Write writes data to the connection.
+// Write can be made to time out and return a Error with Timeout() == true
+// after a fixed time limit; see SetDeadline and SetWriteDeadline.
+func (c *Conn) Write(b []byte) (n int, err error) {
+	select {
+	case <-c.closed:
+		return 0, ErrClosedConn
+	default:
+	}
+
+	sent := 0
+	sliceSize := c.packetSize - sliceOverhead
+	for i := 0; i < len(b); i += sliceSize {
+		nxt := i + sliceSize
+		if nxt > len(b) {
+			nxt = len(b)
+		}
+		slice := b[i:nxt]
+		sliceCopy := c.mux.buffers.Get().([]byte)[:len(slice)]
+		copy(sliceCopy, slice)
+
+		c.nextSeqNoMut.Lock()
+		pkt := packet{
+			src: c.connID,
+			dst: c.dst,
+			hdr: header{
+				packetType: typeData,
+				sequenceNo: c.nextSeqNo,
+				connID:     c.remoteConnID,
+			},
+			data: sliceCopy,
+		}
+		c.nextSeqNo++
+		c.nextSeqNoMut.Unlock()
+
+		if err := c.sendBuffer.Write(pkt); err != nil {
+			return sent, err
+		}
+
+		atomic.AddInt64(&c.packetsOut, 1)
+		atomic.AddInt64(&c.bytesOut, int64(len(slice)+dstHeaderLen))
+
+		sent += len(slice)
+		c.resetExp()
+	}
+	return sent, nil
+}
+
+// Close closes the connection.
+// Any blocked Read or Write operations will be unblocked and return errors.
+func (c *Conn) Close() error {
+	defer func() {
+		_ = recover()
+	}()
+	c.closeOnce.Do(func() {
+		if debugConnection {
+			log.Println(c, "explicit close start")
+			defer log.Println(c, "explicit close done")
+		}
+
+		// XXX: Ugly hack to implement lingering sockets...
+		time.Sleep(4 * defExpTime)
+
+		c.sendBuffer.Stop()
+		c.mux.removeConn(c)
+		close(c.closed)
+
+		c.inbufMut.Lock()
+		c.inbufCond.Broadcast()
+		c.inbufMut.Unlock()
+	})
+	return nil
+}
+
+// LocalAddr returns the local network address.
+func (c *Conn) LocalAddr() net.Addr {
+	return c.mux.Addr()
+}
+
+// RemoteAddr returns the remote network address.
+func (c *Conn) RemoteAddr() net.Addr {
+	return c.dst
+}
+
+// SetDeadline sets the read and write deadlines associated
+// with the connection. It is equivalent to calling both
+// SetReadDeadline and SetWriteDeadline.
+//
+// A deadline is an absolute time after which I/O operations
+// fail with a timeout (see type Error) instead of
+// blocking. The deadline applies to all future I/O, not just
+// the immediately following call to Read or Write.
+//
+// An idle timeout can be implemented by repeatedly extending
+// the deadline after successful Read or Write calls.
+//
+// A zero value for t means I/O operations will not time out.
+//
+// BUG(jb): SetDeadline is not implemented.
+func (c *Conn) SetDeadline(t time.Time) error {
+	return ErrNotImplemented
+}
+
+// SetReadDeadline sets the deadline for future Read calls.
+// A zero value for t means Read will not time out.
+//
+// BUG(jb): SetReadDeadline is not implemented.
+func (c *Conn) SetReadDeadline(t time.Time) error {
+	return ErrNotImplemented
+}
+
+// SetWriteDeadline sets the deadline for future Write calls.
+// Even if write times out, it may return n > 0, indicating that
+// some of the data was successfully written.
+// A zero value for t means Write will not time out.
+//
+// BUG(jb): SetWriteDeadline is not implemented.
+func (c *Conn) SetWriteDeadline(t time.Time) error {
+	return ErrNotImplemented
+}
+
+type Statistics struct {
+	DataPacketsIn     int64
+	DataPacketsOut    int64
+	DataBytesIn       int64
+	DataBytesOut      int64
+	ResentPackets     int64
+	DroppedPackets    int64
+	OutOfOrderPackets int64
+}
+
+// String returns a printable represetnation of the Statistics.
+func (s Statistics) String() string {
+	return fmt.Sprintf("PktsIn: %d, PktsOut: %d, BytesIn: %d, BytesOut: %d, PktsResent: %d, PktsDropped: %d, PktsOutOfOrder: %d",
+		s.DataPacketsIn, s.DataPacketsOut, s.DataBytesIn, s.DataBytesOut, s.ResentPackets, s.DroppedPackets, s.OutOfOrderPackets)
+}
+
+// GetStatistics returns a snapsht of the current connection statistics.
+func (c *Conn) GetStatistics() Statistics {
+	return Statistics{
+		DataPacketsIn:     atomic.LoadInt64(&c.packetsIn),
+		DataPacketsOut:    atomic.LoadInt64(&c.packetsOut),
+		DataBytesIn:       atomic.LoadInt64(&c.bytesIn),
+		DataBytesOut:      atomic.LoadInt64(&c.bytesOut),
+		ResentPackets:     atomic.LoadInt64(&c.resentPackets),
+		DroppedPackets:    atomic.LoadInt64(&c.droppedPackets),
+		OutOfOrderPackets: atomic.LoadInt64(&c.outOfOrderPackets),
+	}
+}
--- a/core/dst/cookie.go
+++ b/core/dst/cookie.go
@ -0,0 +1,29 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/binary"
+	"net"
+)
+
+var cookieKey = make([]byte, 16)
+
+func init() {
+	_, err := rand.Reader.Read(cookieKey)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func cookie(remote net.Addr) uint32 {
+	hash := sha256.New()
+	hash.Write([]byte(remote.String()))
+	hash.Write(cookieKey)
+	bs := hash.Sum(nil)
+	return binary.BigEndian.Uint32(bs)
+}
--- a/core/dst/debug.go
+++ b/core/dst/debug.go
@ -0,0 +1,26 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"os"
+	"strings"
+)
+
+var (
+	debugConnection bool
+	debugMux        bool
+	debugCC         bool
+)
+
+func init() {
+	debug := make(map[string]bool)
+	for _, s := range strings.Split(os.Getenv("DSTDEBUG"), ",") {
+		debug[strings.TrimSpace(s)] = true
+	}
+	debugConnection = debug["conn"]
+	debugMux = debug["mux"]
+	debugCC = debug["cc"]
+}
--- a/core/dst/doc.go
+++ b/core/dst/doc.go
@ -0,0 +1,12 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+/*
+
+Package dst implements the Datagram Stream Transfer protocol.
+
+DST is a way to get reliable stream connections (like TCP) on top of UDP.
+
+*/
+package dst
--- a/core/dst/errors.go
+++ b/core/dst/errors.go
@ -0,0 +1,23 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+// Error represents the various dst-internal error conditions.
+type Error struct {
+	Err string
+}
+
+// Error returns a string representation of the error.
+func (e Error) Error() string {
+	return e.Err
+}
+
+var (
+	ErrClosedConn       = &Error{"operation on closed connection"}
+	ErrClosedMux        = &Error{"operation on closed mux"}
+	ErrHandshakeTimeout = &Error{"handshake timeout"}
+	ErrNotDST           = &Error{"network is not dst"}
+	ErrNotImplemented   = &Error{"not implemented"}
+)
--- a/core/dst/mux.go
+++ b/core/dst/mux.go
@ -0,0 +1,429 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"fmt"
+	"runtime/debug"
+
+	"net"
+	"sync"
+	"time"
+)
+
+const (
+	maxIncomingRequests = 1024
+	maxPacketSize       = 500
+	handshakeTimeout    = 5 * time.Second
+	handshakeInterval   = 1 * time.Second
+)
+
+// Mux is a UDP multiplexer of DST connections.
+type Mux struct {
+	conn       net.PacketConn
+	packetSize int
+
+	conns      map[connectionID]*Conn
+	handshakes map[connectionID]chan packet
+	connsMut   sync.Mutex
+
+	incoming  chan *Conn
+	closed    chan struct{}
+	closeOnce sync.Once
+
+	buffers *sync.Pool
+}
+
+// NewMux creates a new DST Mux on top of a packet connection.
+func NewMux(conn net.PacketConn, packetSize int) *Mux {
+	if packetSize <= 0 {
+		packetSize = maxPacketSize
+	}
+	m := &Mux{
+		conn:       conn,
+		packetSize: packetSize,
+		conns:      map[connectionID]*Conn{},
+		handshakes: make(map[connectionID]chan packet),
+		incoming:   make(chan *Conn, maxIncomingRequests),
+		closed:     make(chan struct{}),
+		buffers: &sync.Pool{
+			New: func() interface{} {
+				return make([]byte, packetSize)
+			},
+		},
+	}
+
+	// Attempt to maximize buffer space. Start at 16 MB and work downwards 0.5
+	// MB at a time.
+
+	if conn, ok := conn.(*net.UDPConn); ok {
+		for buf := 16384 * 1024; buf >= 512*1024; buf -= 512 * 1024 {
+			err := conn.SetReadBuffer(buf)
+			if err == nil {
+				if debugMux {
+					log.Println(m, "read buffer is", buf)
+				}
+				break
+			}
+		}
+		for buf := 16384 * 1024; buf >= 512*1024; buf -= 512 * 1024 {
+			err := conn.SetWriteBuffer(buf)
+			if err == nil {
+				if debugMux {
+					log.Println(m, "write buffer is", buf)
+				}
+				break
+			}
+		}
+	}
+
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		m.readerLoop()
+	}()
+	return m
+}
+
+// Accept waits for and returns the next connection to the listener.
+func (m *Mux) Accept() (net.Conn, error) {
+	return m.AcceptDST()
+}
+
+// AcceptDST waits for and returns the next connection to the listener.
+func (m *Mux) AcceptDST() (*Conn, error) {
+	conn, ok := <-m.incoming
+	if !ok {
+		return nil, ErrClosedMux
+	}
+	return conn, nil
+}
+
+// Close closes the listener.
+// Any blocked Accept operations will be unblocked and return errors.
+func (m *Mux) Close() error {
+	var err error = ErrClosedMux
+	m.closeOnce.Do(func() {
+		err = m.conn.Close()
+		close(m.incoming)
+		close(m.closed)
+	})
+	return err
+}
+
+// Addr returns the listener's network address.
+func (m *Mux) Addr() net.Addr {
+	return m.conn.LocalAddr()
+}
+
+// Dial connects to the address on the named network.
+//
+// Network must be "dst".
+//
+// Addresses have the form host:port. If host is a literal IPv6 address or
+// host name, it must be enclosed in square brackets as in "[::1]:80",
+// "[ipv6-host]:http" or "[ipv6-host%zone]:80". The functions JoinHostPort and
+// SplitHostPort manipulate addresses in this form.
+//
+// Examples:
+//	Dial("dst", "12.34.56.78:80")
+//	Dial("dst", "google.com:http")
+//	Dial("dst", "[2001:db8::1]:http")
+//	Dial("dst", "[fe80::1%lo0]:80")
+func (m *Mux) Dial(network, addr string) (net.Conn, error) {
+	return m.DialDST(network, addr)
+}
+
+// Dial connects to the address on the named network.
+//
+// Network must be "dst".
+//
+// Addresses have the form host:port. If host is a literal IPv6 address or
+// host name, it must be enclosed in square brackets as in "[::1]:80",
+// "[ipv6-host]:http" or "[ipv6-host%zone]:80". The functions JoinHostPort and
+// SplitHostPort manipulate addresses in this form.
+//
+// Examples:
+//	Dial("dst", "12.34.56.78:80")
+//	Dial("dst", "google.com:http")
+//	Dial("dst", "[2001:db8::1]:http")
+//	Dial("dst", "[fe80::1%lo0]:80")
+func (m *Mux) DialDST(network, addr string) (*Conn, error) {
+	if network != "dst" {
+		return nil, ErrNotDST
+	}
+
+	dst, err := net.ResolveUDPAddr("udp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	resp := make(chan packet)
+
+	m.connsMut.Lock()
+	connID := m.newConnID()
+	m.handshakes[connID] = resp
+	m.connsMut.Unlock()
+
+	conn, err := m.clientHandshake(dst, connID, resp)
+
+	m.connsMut.Lock()
+	defer m.connsMut.Unlock()
+	delete(m.handshakes, connID)
+
+	if err != nil {
+		return nil, err
+	}
+
+	m.conns[connID] = conn
+	return conn, nil
+}
+
+// handshake performs the client side handshake (i.e. Dial)
+func (m *Mux) clientHandshake(dst net.Addr, connID connectionID, resp chan packet) (*Conn, error) {
+	if debugMux {
+		log.Printf("%v dial %v connID %v", m, dst, connID)
+	}
+
+	nextHandshake := time.NewTimer(0)
+	defer nextHandshake.Stop()
+
+	handshakeTimeout := time.NewTimer(handshakeTimeout)
+	defer handshakeTimeout.Stop()
+
+	var remoteCookie uint32
+	seqNo := randomSeqNo()
+
+	for {
+		select {
+		case <-m.closed:
+			// Failure. The mux has been closed.
+			return nil, ErrClosedConn
+
+		case <-handshakeTimeout.C:
+			// Handshake timeout. Close and abort.
+			return nil, ErrHandshakeTimeout
+
+		case <-nextHandshake.C:
+			// Send a handshake request.
+
+			m.write(packet{
+				src: connID,
+				dst: dst,
+				hdr: header{
+					packetType: typeHandshake,
+					flags:      flagRequest,
+					connID:     0,
+					sequenceNo: seqNo,
+					timestamp:  timestampMicros(),
+				},
+				data: handshakeData{uint32(m.packetSize), connID, remoteCookie}.marshal(),
+			})
+			nextHandshake.Reset(handshakeInterval)
+
+		case pkt := <-resp:
+			hd := unmarshalHandshakeData(pkt.data)
+
+			if pkt.hdr.flags&flagCookie == flagCookie {
+				// We should resend the handshake request with a different cookie value.
+				remoteCookie = hd.cookie
+				nextHandshake.Reset(0)
+			} else if pkt.hdr.flags&flagResponse == flagResponse {
+				// Successfull handshake response.
+				conn := newConn(m, dst)
+
+				conn.connID = connID
+				conn.remoteConnID = hd.connID
+				conn.nextRecvSeqNo = pkt.hdr.sequenceNo + 1
+				conn.packetSize = int(hd.packetSize)
+				if conn.packetSize > m.packetSize {
+					conn.packetSize = m.packetSize
+				}
+
+				conn.nextSeqNo = seqNo + 1
+
+				conn.start()
+
+				return conn, nil
+			}
+		}
+	}
+}
+
+func (m *Mux) readerLoop() {
+	buf := make([]byte, m.packetSize)
+	for {
+		buf = buf[:cap(buf)]
+		n, from, err := m.conn.ReadFrom(buf)
+		if err != nil {
+			m.Close()
+			return
+		}
+		buf = buf[:n]
+
+		hdr := unmarshalHeader(buf)
+
+		var bufCopy []byte
+		if len(buf) > dstHeaderLen {
+			bufCopy = m.buffers.Get().([]byte)[:len(buf)-dstHeaderLen]
+			copy(bufCopy, buf[dstHeaderLen:])
+		}
+
+		pkt := packet{hdr: hdr, data: bufCopy}
+		if debugMux {
+			log.Println(m, "read", pkt)
+		}
+
+		if hdr.packetType == typeHandshake {
+			m.incomingHandshake(from, hdr, bufCopy)
+		} else {
+			m.connsMut.Lock()
+			conn, ok := m.conns[hdr.connID]
+			m.connsMut.Unlock()
+
+			if ok {
+				conn.in <- packet{
+					dst:  nil,
+					hdr:  hdr,
+					data: bufCopy,
+				}
+			} else if debugMux && hdr.packetType != typeShutdown {
+				log.Printf("packet %v for unknown conn %v", hdr, hdr.connID)
+			}
+		}
+	}
+}
+
+func (m *Mux) incomingHandshake(from net.Addr, hdr header, data []byte) {
+	if hdr.connID == 0 {
+		// A new incoming handshake request.
+		m.incomingHandshakeRequest(from, hdr, data)
+	} else {
+		// A response to an ongoing handshake.
+		m.incomingHandshakeResponse(from, hdr, data)
+	}
+}
+
+func (m *Mux) incomingHandshakeRequest(from net.Addr, hdr header, data []byte) {
+	if hdr.flags&flagRequest != flagRequest {
+		log.Printf("Handshake pattern with flags 0x%x to connID zero", hdr.flags)
+		return
+	}
+
+	hd := unmarshalHandshakeData(data)
+
+	correctCookie := cookie(from)
+	if hd.cookie != correctCookie {
+		// Incorrect or missing SYN cookie. Send back a handshake
+		// with the expected one.
+		m.write(packet{
+			dst: from,
+			hdr: header{
+				packetType: typeHandshake,
+				flags:      flagResponse | flagCookie,
+				connID:     hd.connID,
+				timestamp:  timestampMicros(),
+			},
+			data: handshakeData{
+				packetSize: uint32(m.packetSize),
+				cookie:     correctCookie,
+			}.marshal(),
+		})
+		return
+	}
+
+	seqNo := randomSeqNo()
+
+	m.connsMut.Lock()
+	connID := m.newConnID()
+
+	conn := newConn(m, from)
+	conn.connID = connID
+	conn.remoteConnID = hd.connID
+	conn.nextSeqNo = seqNo + 1
+	conn.nextRecvSeqNo = hdr.sequenceNo + 1
+	conn.packetSize = int(hd.packetSize)
+	if conn.packetSize > m.packetSize {
+		conn.packetSize = m.packetSize
+	}
+	conn.start()
+
+	m.conns[connID] = conn
+	m.connsMut.Unlock()
+
+	m.write(packet{
+		dst: from,
+		hdr: header{
+			packetType: typeHandshake,
+			flags:      flagResponse,
+			connID:     hd.connID,
+			sequenceNo: seqNo,
+			timestamp:  timestampMicros(),
+		},
+		data: handshakeData{
+			connID:     conn.connID,
+			packetSize: uint32(conn.packetSize),
+		}.marshal(),
+	})
+
+	m.incoming <- conn
+}
+
+func (m *Mux) incomingHandshakeResponse(from net.Addr, hdr header, data []byte) {
+	m.connsMut.Lock()
+	handShake, ok := m.handshakes[hdr.connID]
+	m.connsMut.Unlock()
+
+	if ok {
+		// This is a response to a handshake in progress.
+		handShake <- packet{
+			dst:  nil,
+			hdr:  hdr,
+			data: data,
+		}
+	} else if debugMux && hdr.packetType != typeShutdown {
+		log.Printf("Handshake packet %v for unknown conn %v", hdr, hdr.connID)
+	}
+}
+
+func (m *Mux) write(pkt packet) (int, error) {
+	buf := m.buffers.Get().([]byte)
+	buf = buf[:dstHeaderLen+len(pkt.data)]
+	pkt.hdr.marshal(buf)
+	copy(buf[dstHeaderLen:], pkt.data)
+	if debugMux {
+		log.Println(m, "write", pkt)
+	}
+	n, err := m.conn.WriteTo(buf, pkt.dst)
+	m.buffers.Put(buf)
+	return n, err
+}
+
+func (m *Mux) String() string {
+	return fmt.Sprintf("Mux-%v", m.Addr())
+}
+
+// Find a unique connection ID
+func (m *Mux) newConnID() connectionID {
+	for {
+		connID := randomConnID()
+		if _, ok := m.conns[connID]; ok {
+			continue
+		}
+		if _, ok := m.handshakes[connID]; ok {
+			continue
+		}
+		return connID
+	}
+}
+
+func (m *Mux) removeConn(c *Conn) {
+	m.connsMut.Lock()
+	delete(m.conns, c.connID)
+	m.connsMut.Unlock()
+}
--- a/core/dst/packetlist.go
+++ b/core/dst/packetlist.go
@ -0,0 +1,119 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+type packetList struct {
+	packets []packet
+	slot    int
+}
+
+// CutLessSeq cuts packets from the start of the list with sequence numbers
+// lower than seq. Returns the number of packets that were cut.
+func (l *packetList) CutLessSeq(seq sequenceNo) int {
+	var i, cut int
+	for i = range l.packets {
+		if i == l.slot {
+			break
+		}
+		if !l.packets[i].LessSeq(seq) {
+			break
+		}
+		cut++
+	}
+	if cut > 0 {
+		l.Cut(cut)
+	}
+	return cut
+}
+
+func (l *packetList) Cut(n int) {
+	copy(l.packets, l.packets[n:])
+	l.slot -= n
+}
+
+func (l *packetList) Full() bool {
+	return l.slot == len(l.packets)
+}
+
+func (l *packetList) All() []packet {
+	return l.packets[:l.slot]
+}
+
+func (l *packetList) Append(pkt packet) bool {
+	if l.slot == len(l.packets) {
+		return false
+	}
+	l.packets[l.slot] = pkt
+	l.slot++
+	return true
+}
+
+func (l *packetList) AppendAll(pkts []packet) {
+	l.packets = append(l.packets[:l.slot], pkts...)
+	l.slot += len(pkts)
+}
+
+func (l *packetList) Cap() int {
+	return len(l.packets)
+}
+
+func (l *packetList) Len() int {
+	return l.slot
+}
+
+func (l *packetList) Resize(s int) {
+	if s <= cap(l.packets) {
+		l.packets = l.packets[:s]
+	} else {
+		t := make([]packet, s)
+		copy(t, l.packets)
+		l.packets = t
+	}
+}
+
+func (l *packetList) InsertSorted(pkt packet) {
+	for i := range l.packets {
+		if i >= l.slot {
+			l.packets[i] = pkt
+			l.slot++
+			return
+		}
+		if pkt.hdr.sequenceNo == l.packets[i].hdr.sequenceNo {
+			return
+		}
+		if pkt.Less(l.packets[i]) {
+			copy(l.packets[i+1:], l.packets[i:])
+			l.packets[i] = pkt
+			if l.slot < len(l.packets) {
+				l.slot++
+			}
+			return
+		}
+	}
+}
+
+func (l *packetList) LowestSeq() sequenceNo {
+	return l.packets[0].hdr.sequenceNo
+}
+
+func (l *packetList) PopSequence(maxSeq sequenceNo) []packet {
+	highSeq := l.packets[0].hdr.sequenceNo
+	if highSeq >= maxSeq {
+		return nil
+	}
+
+	var i int
+	for i = 1; i < l.slot; i++ {
+		seq := l.packets[i].hdr.sequenceNo
+		if seq != highSeq+1 || seq >= maxSeq {
+			break
+		}
+		highSeq++
+	}
+	pkts := make([]packet, i)
+	copy(pkts, l.packets[:i])
+	l.Cut(i)
+	return pkts
+}
--- a/core/dst/packets.go
+++ b/core/dst/packets.go
@ -0,0 +1,155 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+)
+
+const dstHeaderLen = 12
+
+type packetType int8
+
+const (
+	typeHandshake packetType = 0x0
+	typeData                 = 0x1
+	typeAck                  = 0x2
+	typeNegAck               = 0x3
+	typeShutdown             = 0x4
+)
+
+func (t packetType) String() string {
+	switch t {
+	case typeData:
+		return "data"
+	case typeHandshake:
+		return "handshake"
+	case typeAck:
+		return "ack"
+	case typeNegAck:
+		return "negAck"
+	case typeShutdown:
+		return "shutdown"
+	default:
+		return "unknown"
+	}
+}
+
+type connectionID uint32
+
+func (c connectionID) String() string {
+	return fmt.Sprintf("Ci%08x", uint32(c))
+}
+
+type sequenceNo uint32
+
+func (s sequenceNo) String() string {
+	return fmt.Sprintf("Sq%d", uint32(s))
+}
+
+type timestamp uint32
+
+func (t timestamp) String() string {
+	return fmt.Sprintf("Ts%d", uint32(t))
+}
+
+const (
+	flagRequest  = 1 << 0 // This packet is a handshake request
+	flagResponse = 1 << 1 // This packet is a handshake response
+	flagCookie   = 1 << 2 // This packet contains a coookie challenge
+)
+
+type header struct {
+	packetType packetType   // 4 bits
+	flags      uint8        // 4 bits
+	connID     connectionID // 24 bits
+	sequenceNo sequenceNo
+	timestamp  timestamp
+}
+
+func (h header) marshal(bs []byte) {
+	binary.BigEndian.PutUint32(bs, uint32(h.connID&0xffffff))
+	bs[0] = h.flags | uint8(h.packetType)<<4
+	binary.BigEndian.PutUint32(bs[4:], uint32(h.sequenceNo))
+	binary.BigEndian.PutUint32(bs[8:], uint32(h.timestamp))
+}
+
+func unmarshalHeader(bs []byte) header {
+	var h header
+	h.packetType = packetType(bs[0] >> 4)
+	h.flags = bs[0] & 0xf
+	h.connID = connectionID(binary.BigEndian.Uint32(bs) & 0xffffff)
+	h.sequenceNo = sequenceNo(binary.BigEndian.Uint32(bs[4:]))
+	h.timestamp = timestamp(binary.BigEndian.Uint32(bs[8:]))
+	return h
+}
+
+func (h header) String() string {
+	return fmt.Sprintf("header{type=%s flags=0x%x connID=%v seq=%v time=%v}", h.packetType, h.flags, h.connID, h.sequenceNo, h.timestamp)
+}
+
+type handshakeData struct {
+	packetSize uint32
+	connID     connectionID
+	cookie     uint32
+}
+
+func (h handshakeData) marshalInto(data []byte) {
+	binary.BigEndian.PutUint32(data[0:], h.packetSize)
+	binary.BigEndian.PutUint32(data[4:], uint32(h.connID))
+	binary.BigEndian.PutUint32(data[8:], h.cookie)
+}
+
+func (h handshakeData) marshal() []byte {
+	var data [12]byte
+	h.marshalInto(data[:])
+	return data[:]
+}
+
+func unmarshalHandshakeData(data []byte) handshakeData {
+	var h handshakeData
+	h.packetSize = binary.BigEndian.Uint32(data[0:])
+	h.connID = connectionID(binary.BigEndian.Uint32(data[4:]))
+	h.cookie = binary.BigEndian.Uint32(data[8:])
+	return h
+}
+
+func (h handshakeData) String() string {
+	return fmt.Sprintf("handshake{size=%d connID=%v cookie=0x%08x}", h.packetSize, h.connID, h.cookie)
+}
+
+type packet struct {
+	src  connectionID
+	dst  net.Addr
+	hdr  header
+	data []byte
+}
+
+func (p packet) String() string {
+	var dst string
+	if p.dst != nil {
+		dst = "dst=" + p.dst.String() + " "
+	}
+	switch p.hdr.packetType {
+	case typeHandshake:
+		return fmt.Sprintf("%spacket{src=%v %v %v}", dst, p.src, p.hdr, unmarshalHandshakeData(p.data))
+	default:
+		return fmt.Sprintf("%spacket{src=%v %v data[:%d]}", dst, p.src, p.hdr, len(p.data))
+	}
+}
+
+func (p packet) LessSeq(seq sequenceNo) bool {
+	diff := seq - p.hdr.sequenceNo
+	if diff == 0 {
+		return false
+	}
+	return diff < 1<<31
+}
+
+func (a packet) Less(b packet) bool {
+	return a.LessSeq(b.hdr.sequenceNo)
+}
--- a/core/dst/sendbuffer.go
+++ b/core/dst/sendbuffer.go
@ -0,0 +1,268 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"fmt"
+	"runtime/debug"
+
+	"sync"
+
+	"github.com/juju/ratelimit"
+)
+
+/*
+	                          sendWindow
+	                         v
+		[S|S|S|S|Q|Q|Q|Q| | | | | | | | | ]
+		         ^       ^writeSlot
+		          sendSlot
+*/
+type sendBuffer struct {
+	mux       *Mux              // we send packets here
+	scheduler *ratelimit.Bucket // sets send rate for packets
+
+	sendWindow int // maximum number of outstanding non-acked packets
+	packetRate int // target pps
+
+	send     packetList // buffered packets
+	sendSlot int        // buffer slot from which to send next packet
+
+	lost     packetList // list of packets reported lost by timeout
+	lostSlot int        // next lost packet to resend
+
+	closed  bool
+	closing bool
+	mut     sync.Mutex
+	cond    *sync.Cond
+}
+
+const (
+	schedulerRate     = 1e6
+	schedulerCapacity = schedulerRate / 40
+)
+
+// newSendBuffer creates a new send buffer with a zero window.
+// SetRateAndWindow() must be called to set an initial packet rate and send
+// window before using.
+func newSendBuffer(m *Mux) *sendBuffer {
+	b := &sendBuffer{
+		mux:       m,
+		scheduler: ratelimit.NewBucketWithRate(schedulerRate, schedulerCapacity),
+	}
+	b.cond = sync.NewCond(&b.mut)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		b.writerLoop()
+	}()
+	return b
+}
+
+// Write puts a new packet in send buffer and schedules a send. Blocks when
+// the window size is or would be exceeded.
+func (b *sendBuffer) Write(pkt packet) error {
+	b.mut.Lock()
+	defer b.mut.Unlock()
+
+	for b.send.Full() || b.send.Len() >= b.sendWindow {
+		if b.closing {
+			return ErrClosedConn
+		}
+		if debugConnection {
+			log.Println(b, "Write blocked")
+		}
+		b.cond.Wait()
+	}
+	if !b.send.Append(pkt) {
+		panic("bug: append failed")
+	}
+	b.cond.Broadcast()
+	return nil
+}
+
+// Acknowledge removes packets with lower sequence numbers from the loss list
+// or send buffer.
+func (b *sendBuffer) Acknowledge(seq sequenceNo) {
+	b.mut.Lock()
+
+	if cut := b.lost.CutLessSeq(seq); cut > 0 {
+		if debugConnection {
+			log.Println(b, "cut", cut, "from loss list")
+		}
+		// Next resend should always start with the first packet, regardless
+		// of what we might already have resent previously.
+		b.lostSlot = 0
+		b.cond.Broadcast()
+	}
+
+	if cut := b.send.CutLessSeq(seq); cut > 0 {
+		if debugConnection {
+			log.Println(b, "cut", cut, "from send list")
+		}
+		b.sendSlot -= cut
+		b.cond.Broadcast()
+	}
+
+	b.mut.Unlock()
+}
+
+func (b *sendBuffer) NegativeAck(seq sequenceNo) {
+	b.mut.Lock()
+
+	pkts := b.send.PopSequence(seq)
+	if cut := len(pkts); cut > 0 {
+		b.lost.AppendAll(pkts)
+		if debugConnection {
+			log.Println(b, "cut", cut, "from send list, adding to loss list")
+			log.Println(seq, pkts)
+		}
+		b.sendSlot -= cut
+		b.lostSlot = 0
+		b.cond.Broadcast()
+	}
+
+	b.mut.Unlock()
+}
+
+// ScheduleResend arranges for a resend of all currently unacknowledged
+// packets.
+func (b *sendBuffer) ScheduleResend() {
+	b.mut.Lock()
+
+	if b.sendSlot > 0 {
+		// There are packets that have been sent but not acked. Move them from
+		// the send buffer to the loss list for retransmission.
+		if debugConnection {
+			log.Println(b, "scheduled resend from send list", b.sendSlot)
+		}
+
+		// Append the packets to the loss list and rewind the send buffer
+		b.lost.AppendAll(b.send.All()[:b.sendSlot])
+		b.send.Cut(b.sendSlot)
+		b.sendSlot = 0
+		b.cond.Broadcast()
+	}
+
+	if b.lostSlot > 0 {
+		// Also resend whatever was already in the loss list
+		if debugConnection {
+			log.Println(b, "scheduled resend from loss list", b.lostSlot)
+		}
+		b.lostSlot = 0
+		b.cond.Broadcast()
+	}
+
+	b.mut.Unlock()
+}
+
+// SetWindowAndRate sets the window size (in packets) and packet rate (in
+// packets per second) to use when sending.
+func (b *sendBuffer) SetWindowAndRate(sendWindow, packetRate int) {
+	b.mut.Lock()
+	if debugConnection {
+		log.Println(b, "new window & rate", sendWindow, packetRate)
+	}
+	b.packetRate = packetRate
+	b.sendWindow = sendWindow
+	if b.sendWindow > b.send.Cap() {
+		b.send.Resize(b.sendWindow)
+		b.cond.Broadcast()
+	}
+	b.mut.Unlock()
+}
+
+// Stop stops the send buffer from any doing further sending, but waits for
+// the current buffers to be drained.
+func (b *sendBuffer) Stop() {
+	b.mut.Lock()
+
+	if b.closed || b.closing {
+		return
+	}
+
+	b.closing = true
+	for b.lost.Len() > 0 || b.send.Len() > 0 {
+		b.cond.Wait()
+	}
+
+	b.closed = true
+	b.cond.Broadcast()
+	b.mut.Unlock()
+}
+
+// CrashStop stops the send buffer from any doing further sending, without
+// waiting for buffers to drain.
+func (b *sendBuffer) CrashStop() {
+	b.mut.Lock()
+
+	if b.closed || b.closing {
+		return
+	}
+
+	b.closing = true
+	b.closed = true
+	b.cond.Broadcast()
+	b.mut.Unlock()
+}
+
+func (b *sendBuffer) String() string {
+	return fmt.Sprintf("sendBuffer@%p", b)
+}
+
+func (b *sendBuffer) writerLoop() {
+	if debugConnection {
+		log.Println(b, "writer() starting")
+		defer log.Println(b, "writer() exiting")
+	}
+
+	b.scheduler.Take(schedulerCapacity)
+	for {
+		var pkt packet
+		b.mut.Lock()
+		for b.lostSlot >= b.sendWindow ||
+			(b.sendSlot == b.send.Len() && b.lostSlot == b.lost.Len()) {
+			if b.closed {
+				b.mut.Unlock()
+				return
+			}
+
+			if debugConnection {
+				log.Println(b, "writer() paused", b.lostSlot, b.sendSlot, b.sendWindow, b.lost.Len())
+			}
+			b.cond.Wait()
+		}
+
+		if b.lostSlot < b.lost.Len() {
+			pkt = b.lost.All()[b.lostSlot]
+			pkt.hdr.timestamp = timestampMicros()
+			b.lostSlot++
+
+			if debugConnection {
+				log.Println(b, "resend", b.lostSlot, b.lost.Len(), b.sendWindow, pkt.hdr.connID, pkt.hdr.sequenceNo)
+			}
+		} else if b.sendSlot < b.send.Len() {
+			pkt = b.send.All()[b.sendSlot]
+			pkt.hdr.timestamp = timestampMicros()
+			b.sendSlot++
+
+			if debugConnection {
+				log.Println(b, "send", b.sendSlot, b.send.Len(), b.sendWindow, pkt.hdr.connID, pkt.hdr.sequenceNo)
+			}
+		}
+
+		b.cond.Broadcast()
+		packetRate := b.packetRate
+		b.mut.Unlock()
+
+		if pkt.dst != nil {
+			b.scheduler.Wait(schedulerRate / int64(packetRate))
+			b.mux.write(pkt)
+		}
+	}
+}
--- a/core/dst/util.go
+++ b/core/dst/util.go
@ -0,0 +1,29 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	logger "log"
+	"math/rand"
+	"os"
+	"time"
+)
+
+var log = logger.New(os.Stderr, "", logger.LstdFlags)
+
+func SetLogger(l *logger.Logger) {
+	log = l
+}
+func timestampMicros() timestamp {
+	return timestamp(time.Now().UnixNano() / 1000)
+}
+
+func randomSeqNo() sequenceNo {
+	return sequenceNo(rand.Uint32())
+}
+
+func randomConnID() connectionID {
+	return connectionID(rand.Uint32() & 0xffffff)
+}
--- a/core/dst/windowcc.go
+++ b/core/dst/windowcc.go
@ -0,0 +1,144 @@
+// Copyright 2014 The DST Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package dst
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"time"
+)
+
+type windowCC struct {
+	minWindow     int
+	maxWindow     int
+	currentWindow int
+	minRate       int
+	maxRate       int
+	currentRate   int
+	targetRate    int
+
+	curRTT time.Duration
+	minRTT time.Duration
+
+	statsFile io.WriteCloser
+	start     time.Time
+}
+
+func newWindowCC() *windowCC {
+	var statsFile io.WriteCloser
+
+	if debugCC {
+		statsFile, _ = os.Create(fmt.Sprintf("cc-log-%d.csv", time.Now().Unix()))
+		fmt.Fprintf(statsFile, "ms,minWin,maxWin,curWin,minRate,maxRate,curRate,minRTT,curRTT\n")
+	}
+
+	return &windowCC{
+		minWindow:     1, // Packets
+		maxWindow:     16 << 10,
+		currentWindow: 1,
+
+		minRate:     100,  // PPS
+		maxRate:     80e3, // Roughly 1 Gbps at 1500 bytes per packet
+		currentRate: 100,
+		targetRate:  1000,
+
+		minRTT:    10 * time.Second,
+		statsFile: statsFile,
+		start:     time.Now(),
+	}
+}
+
+func (w *windowCC) Ack() {
+	if w.curRTT > w.minRTT+100*time.Millisecond {
+		return
+	}
+
+	changed := false
+
+	if w.currentWindow < w.maxWindow {
+		w.currentWindow++
+		changed = true
+	}
+
+	if w.currentRate != w.targetRate {
+		w.currentRate = (w.currentRate*7 + w.targetRate) / 8
+		changed = true
+	}
+
+	if changed && debugCC {
+		w.log()
+		log.Println("Ack", w.currentWindow, w.currentRate)
+	}
+}
+
+func (w *windowCC) NegAck() {
+	if w.currentWindow > w.minWindow {
+		w.currentWindow /= 2
+	}
+	if w.currentRate > w.minRate {
+		w.currentRate /= 2
+	}
+	if debugCC {
+		w.log()
+		log.Println("NegAck", w.currentWindow, w.currentRate)
+	}
+}
+
+func (w *windowCC) Exp() {
+	w.currentWindow = w.minWindow
+	if debugCC {
+		w.log()
+		log.Println("Exp", w.currentWindow, w.currentRate)
+	}
+}
+
+func (w *windowCC) SendWindow() int {
+	if w.currentWindow < w.minWindow {
+		return w.minWindow
+	}
+	if w.currentWindow > w.maxWindow {
+		return w.maxWindow
+	}
+	return w.currentWindow
+}
+
+func (w *windowCC) PacketRate() int {
+	if w.currentRate < w.minRate {
+		return w.minRate
+	}
+	if w.currentRate > w.maxRate {
+		return w.maxRate
+	}
+	return w.currentRate
+}
+
+func (w *windowCC) UpdateRTT(rtt time.Duration) {
+	w.curRTT = rtt
+	if w.curRTT < w.minRTT {
+		w.minRTT = w.curRTT
+		if debugCC {
+			log.Println("Min RTT", w.minRTT)
+		}
+	}
+
+	if w.curRTT > w.minRTT+200*time.Millisecond && w.targetRate > 2*w.minRate {
+		w.targetRate -= w.minRate
+	} else if w.curRTT < w.minRTT+20*time.Millisecond && w.targetRate < w.maxRate {
+		w.targetRate += w.minRate
+	}
+
+	if debugCC {
+		w.log()
+		log.Println("RTT", w.curRTT, "target rate", w.targetRate, "current rate", w.currentRate, "current window", w.currentWindow)
+	}
+}
+
+func (w *windowCC) log() {
+	if w.statsFile == nil {
+		return
+	}
+	fmt.Fprintf(w.statsFile, "%.02f,%d,%d,%d,%d,%d,%d,%.02f,%.02f\n", time.Since(w.start).Seconds()*1000, w.minWindow, w.maxWindow, w.currentWindow, w.minRate, w.maxRate, w.currentRate, w.minRTT.Seconds()*1000, w.curRTT.Seconds()*1000)
+}
--- a/core/lib/buf/leakybuf.go
+++ b/core/lib/buf/leakybuf.go
@ -0,0 +1,52 @@
+// Provides leaky buffer, based on the example in Effective Go.
+package buf
+
+type LeakyBuf struct {
+	bufSize  int // size of each buffer
+	freeList chan []byte
+}
+
+const LeakyBufSize = 2048 // data.len(2) + hmacsha1(10) + data(4096)
+const maxNBuf = 2048
+
+var LeakyBuffer = NewLeakyBuf(maxNBuf, LeakyBufSize)
+
+func Get() (b []byte) {
+	return LeakyBuffer.Get()
+}
+func Put(b []byte) {
+	LeakyBuffer.Put(b)
+}
+
+// NewLeakyBuf creates a leaky buffer which can hold at most n buffer, each
+// with bufSize bytes.
+func NewLeakyBuf(n, bufSize int) *LeakyBuf {
+	return &LeakyBuf{
+		bufSize:  bufSize,
+		freeList: make(chan []byte, n),
+	}
+}
+
+// Get returns a buffer from the leaky buffer or create a new buffer.
+func (lb *LeakyBuf) Get() (b []byte) {
+	select {
+	case b = <-lb.freeList:
+	default:
+		b = make([]byte, lb.bufSize)
+	}
+	return
+}
+
+// Put add the buffer into the free buffer pool for reuse. Panic if the buffer
+// size is not the same with the leaky buffer's. This is intended to expose
+// error usage of leaky buffer.
+func (lb *LeakyBuf) Put(b []byte) {
+	if len(b) != lb.bufSize {
+		panic("invalid buffer size that's put into leaky buffer")
+	}
+	select {
+	case lb.freeList <- b:
+	default:
+	}
+	return
+}
--- a/core/lib/ioutils/utils.go
+++ b/core/lib/ioutils/utils.go
@ -0,0 +1,68 @@
+package ioutils
+
+import (
+	"io"
+	logger "log"
+
+	lbuf "github.com/snail007/goproxy/core/lib/buf"
+)
+
+func IoBind(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interface{}), log *logger.Logger) {
+	go func() {
+		defer func() {
+			if err := recover(); err != nil {
+				log.Printf("bind crashed %s", err)
+			}
+		}()
+		e1 := make(chan interface{}, 1)
+		e2 := make(chan interface{}, 1)
+		go func() {
+			defer func() {
+				if err := recover(); err != nil {
+					log.Printf("bind crashed %s", err)
+				}
+			}()
+			//_, err := io.Copy(dst, src)
+			err := ioCopy(dst, src)
+			e1 <- err
+		}()
+		go func() {
+			defer func() {
+				if err := recover(); err != nil {
+					log.Printf("bind crashed %s", err)
+				}
+			}()
+			//_, err := io.Copy(src, dst)
+			err := ioCopy(src, dst)
+			e2 <- err
+		}()
+		var err interface{}
+		select {
+		case err = <-e1:
+			//log.Printf("e1")
+		case err = <-e2:
+			//log.Printf("e2")
+		}
+		src.Close()
+		dst.Close()
+		if fn != nil {
+			fn(err)
+		}
+	}()
+}
+func ioCopy(dst io.ReadWriter, src io.ReadWriter) (err error) {
+	buf := lbuf.LeakyBuffer.Get()
+	defer lbuf.LeakyBuffer.Put(buf)
+	n := 0
+	for {
+		n, err = src.Read(buf)
+		if n > 0 {
+			if _, e := dst.Write(buf[0:n]); e != nil {
+				return e
+			}
+		}
+		if err != nil {
+			return
+		}
+	}
+}
--- a/core/lib/kcpcfg/args.go
+++ b/core/lib/kcpcfg/args.go
@ -0,0 +1,24 @@
+package kcpcfg
+
+import kcp "github.com/xtaci/kcp-go"
+
+type KCPConfigArgs struct {
+	Key          *string
+	Crypt        *string
+	Mode         *string
+	MTU          *int
+	SndWnd       *int
+	RcvWnd       *int
+	DataShard    *int
+	ParityShard  *int
+	DSCP         *int
+	NoComp       *bool
+	AckNodelay   *bool
+	NoDelay      *int
+	Interval     *int
+	Resend       *int
+	NoCongestion *int
+	SockBuf      *int
+	KeepAlive    *int
+	Block        kcp.BlockCrypt
+}
--- a/core/lib/mapx/map.go
+++ b/core/lib/mapx/map.go
@ -0,0 +1,355 @@
+package mapx
+
+import (
+	"encoding/json"
+	"fmt"
+	"runtime/debug"
+	"sync"
+)
+
+var SHARD_COUNT = 32
+
+// A "thread" safe map of type string:Anything.
+// To avoid lock bottlenecks this map is dived to several (SHARD_COUNT) map shards.
+type ConcurrentMap []*ConcurrentMapShared
+
+// A "thread" safe string to anything map.
+type ConcurrentMapShared struct {
+	items        map[string]interface{}
+	sync.RWMutex // Read Write mutex, guards access to internal map.
+}
+
+// Creates a new concurrent map.
+func NewConcurrentMap() ConcurrentMap {
+	m := make(ConcurrentMap, SHARD_COUNT)
+	for i := 0; i < SHARD_COUNT; i++ {
+		m[i] = &ConcurrentMapShared{items: make(map[string]interface{})}
+	}
+	return m
+}
+
+// Returns shard under given key
+func (m ConcurrentMap) GetShard(key string) *ConcurrentMapShared {
+	return m[uint(fnv32(key))%uint(SHARD_COUNT)]
+}
+
+func (m ConcurrentMap) MSet(data map[string]interface{}) {
+	for key, value := range data {
+		shard := m.GetShard(key)
+		shard.Lock()
+		shard.items[key] = value
+		shard.Unlock()
+	}
+}
+
+// Sets the given value under the specified key.
+func (m ConcurrentMap) Set(key string, value interface{}) {
+	// Get map shard.
+	shard := m.GetShard(key)
+	shard.Lock()
+	shard.items[key] = value
+	shard.Unlock()
+}
+
+// Callback to return new element to be inserted into the map
+// It is called while lock is held, therefore it MUST NOT
+// try to access other keys in same map, as it can lead to deadlock since
+// Go sync.RWLock is not reentrant
+type UpsertCb func(exist bool, valueInMap interface{}, newValue interface{}) interface{}
+
+// Insert or Update - updates existing element or inserts a new one using UpsertCb
+func (m ConcurrentMap) Upsert(key string, value interface{}, cb UpsertCb) (res interface{}) {
+	shard := m.GetShard(key)
+	shard.Lock()
+	v, ok := shard.items[key]
+	res = cb(ok, v, value)
+	shard.items[key] = res
+	shard.Unlock()
+	return res
+}
+
+// Sets the given value under the specified key if no value was associated with it.
+func (m ConcurrentMap) SetIfAbsent(key string, value interface{}) bool {
+	// Get map shard.
+	shard := m.GetShard(key)
+	shard.Lock()
+	_, ok := shard.items[key]
+	if !ok {
+		shard.items[key] = value
+	}
+	shard.Unlock()
+	return !ok
+}
+
+// Retrieves an element from map under given key.
+func (m ConcurrentMap) Get(key string) (interface{}, bool) {
+	// Get shard
+	shard := m.GetShard(key)
+	shard.RLock()
+	// Get item from shard.
+	val, ok := shard.items[key]
+	shard.RUnlock()
+	return val, ok
+}
+
+// Returns the number of elements within the map.
+func (m ConcurrentMap) Count() int {
+	count := 0
+	for i := 0; i < SHARD_COUNT; i++ {
+		shard := m[i]
+		shard.RLock()
+		count += len(shard.items)
+		shard.RUnlock()
+	}
+	return count
+}
+
+// Looks up an item under specified key
+func (m ConcurrentMap) Has(key string) bool {
+	// Get shard
+	shard := m.GetShard(key)
+	shard.RLock()
+	// See if element is within shard.
+	_, ok := shard.items[key]
+	shard.RUnlock()
+	return ok
+}
+
+// Removes an element from the map.
+func (m ConcurrentMap) Remove(key string) {
+	// Try to get shard.
+	shard := m.GetShard(key)
+	shard.Lock()
+	delete(shard.items, key)
+	shard.Unlock()
+}
+
+// Removes an element from the map and returns it
+func (m ConcurrentMap) Pop(key string) (v interface{}, exists bool) {
+	// Try to get shard.
+	shard := m.GetShard(key)
+	shard.Lock()
+	v, exists = shard.items[key]
+	delete(shard.items, key)
+	shard.Unlock()
+	return v, exists
+}
+
+// Checks if map is empty.
+func (m ConcurrentMap) IsEmpty() bool {
+	return m.Count() == 0
+}
+
+// Used by the Iter & IterBuffered functions to wrap two variables together over a channel,
+type Tuple struct {
+	Key string
+	Val interface{}
+}
+
+// Returns an iterator which could be used in a for range loop.
+//
+// Deprecated: using IterBuffered() will get a better performence
+func (m ConcurrentMap) Iter() <-chan Tuple {
+	chans := snapshot(m)
+	ch := make(chan Tuple)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		fanIn(chans, ch)
+	}()
+	return ch
+}
+
+// Returns a buffered iterator which could be used in a for range loop.
+func (m ConcurrentMap) IterBuffered() <-chan Tuple {
+	chans := snapshot(m)
+	total := 0
+	for _, c := range chans {
+		total += cap(c)
+	}
+	ch := make(chan Tuple, total)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		fanIn(chans, ch)
+	}()
+	return ch
+}
+
+// Returns a array of channels that contains elements in each shard,
+// which likely takes a snapshot of `m`.
+// It returns once the size of each buffered channel is determined,
+// before all the channels are populated using goroutines.
+func snapshot(m ConcurrentMap) (chans []chan Tuple) {
+	chans = make([]chan Tuple, SHARD_COUNT)
+	wg := sync.WaitGroup{}
+	wg.Add(SHARD_COUNT)
+	// Foreach shard.
+	for index, shard := range m {
+		go func(index int, shard *ConcurrentMapShared) {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+				}
+			}()
+			// Foreach key, value pair.
+			shard.RLock()
+			chans[index] = make(chan Tuple, len(shard.items))
+			wg.Done()
+			for key, val := range shard.items {
+				chans[index] <- Tuple{key, val}
+			}
+			shard.RUnlock()
+			close(chans[index])
+		}(index, shard)
+	}
+	wg.Wait()
+	return chans
+}
+
+// fanIn reads elements from channels `chans` into channel `out`
+func fanIn(chans []chan Tuple, out chan Tuple) {
+	wg := sync.WaitGroup{}
+	wg.Add(len(chans))
+	for _, ch := range chans {
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+				}
+			}()
+			func(ch chan Tuple) {
+				for t := range ch {
+					out <- t
+				}
+				wg.Done()
+			}(ch)
+		}()
+	}
+	wg.Wait()
+	close(out)
+}
+
+// Returns all items as map[string]interface{}
+func (m ConcurrentMap) Items() map[string]interface{} {
+	tmp := make(map[string]interface{})
+
+	// Insert items to temporary map.
+	for item := range m.IterBuffered() {
+		tmp[item.Key] = item.Val
+	}
+
+	return tmp
+}
+
+// Iterator callback,called for every key,value found in
+// maps. RLock is held for all calls for a given shard
+// therefore callback sess consistent view of a shard,
+// but not across the shards
+type IterCb func(key string, v interface{})
+
+// Callback based iterator, cheapest way to read
+// all elements in a map.
+func (m ConcurrentMap) IterCb(fn IterCb) {
+	for idx := range m {
+		shard := (m)[idx]
+		shard.RLock()
+		for key, value := range shard.items {
+			fn(key, value)
+		}
+		shard.RUnlock()
+	}
+}
+
+// Return all keys as []string
+func (m ConcurrentMap) Keys() []string {
+	count := m.Count()
+	ch := make(chan string, count)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		// Foreach shard.
+		wg := sync.WaitGroup{}
+		wg.Add(SHARD_COUNT)
+		for _, shard := range m {
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+					}
+				}()
+				func(shard *ConcurrentMapShared) {
+					// Foreach key, value pair.
+					shard.RLock()
+					for key := range shard.items {
+						ch <- key
+					}
+					shard.RUnlock()
+					wg.Done()
+				}(shard)
+			}()
+		}
+		wg.Wait()
+		close(ch)
+	}()
+
+	// Generate keys
+	keys := make([]string, 0, count)
+	for k := range ch {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
+//Reviles ConcurrentMap "private" variables to json marshal.
+func (m ConcurrentMap) MarshalJSON() ([]byte, error) {
+	// Create a temporary map, which will hold all item spread across shards.
+	tmp := make(map[string]interface{})
+
+	// Insert items to temporary map.
+	for item := range m.IterBuffered() {
+		tmp[item.Key] = item.Val
+	}
+	return json.Marshal(tmp)
+}
+
+func fnv32(key string) uint32 {
+	hash := uint32(2166136261)
+	const prime32 = uint32(16777619)
+	for i := 0; i < len(key); i++ {
+		hash *= prime32
+		hash ^= uint32(key[i])
+	}
+	return hash
+}
+
+// Concurrent map uses Interface{} as its value, therefor JSON Unmarshal
+// will probably won't know which to type to unmarshal into, in such case
+// we'll end up with a value of type map[string]interface{}, In most cases this isn't
+// out value type, this is why we've decided to remove this functionality.
+
+// func (m *ConcurrentMap) UnmarshalJSON(b []byte) (err error) {
+// 	// Reverse process of Marshal.
+
+// 	tmp := make(map[string]interface{})
+
+// 	// Unmarshal into a single map.
+// 	if err := json.Unmarshal(b, &tmp); err != nil {
+// 		return nil
+// 	}
+
+// 	// foreach key,value pair in temporary map insert into our concurrent map.
+// 	for key, val := range tmp {
+// 		m.Set(key, val)
+// 	}
+// 	return nil
+// }
--- a/core/lib/socks5/socks5.go
+++ b/core/lib/socks5/socks5.go
@ -0,0 +1,159 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+)
+
+const (
+	Method_NO_AUTH         = uint8(0x00)
+	Method_GSSAPI          = uint8(0x01)
+	Method_USER_PASS       = uint8(0x02)
+	Method_IANA            = uint8(0x7F)
+	Method_RESVERVE        = uint8(0x80)
+	Method_NONE_ACCEPTABLE = uint8(0xFF)
+	VERSION_V5             = uint8(0x05)
+	CMD_CONNECT            = uint8(0x01)
+	CMD_BIND               = uint8(0x02)
+	CMD_ASSOCIATE          = uint8(0x03)
+	ATYP_IPV4              = uint8(0x01)
+	ATYP_DOMAIN            = uint8(0x03)
+	ATYP_IPV6              = uint8(0x04)
+	REP_SUCCESS            = uint8(0x00)
+	REP_REQ_FAIL           = uint8(0x01)
+	REP_RULE_FORBIDDEN     = uint8(0x02)
+	REP_NETWOR_UNREACHABLE = uint8(0x03)
+	REP_HOST_UNREACHABLE   = uint8(0x04)
+	REP_CONNECTION_REFUSED = uint8(0x05)
+	REP_TTL_TIMEOUT        = uint8(0x06)
+	REP_CMD_UNSUPPORTED    = uint8(0x07)
+	REP_ATYP_UNSUPPORTED   = uint8(0x08)
+	REP_UNKNOWN            = uint8(0x09)
+	RSV                    = uint8(0x00)
+)
+
+var (
+	ZERO_IP   = []byte{0x00, 0x00, 0x00, 0x00}
+	ZERO_PORT = []byte{0x00, 0x00}
+)
+var Socks5Errors = []string{
+	"",
+	"general failure",
+	"connection forbidden",
+	"network unreachable",
+	"host unreachable",
+	"connection refused",
+	"TTL expired",
+	"command not supported",
+	"address type not supported",
+}
+
+// Auth contains authentication parameters that specific Dialers may require.
+type UsernamePassword struct {
+	Username, Password string
+}
+
+type PacketUDP struct {
+	rsv     uint16
+	frag    uint8
+	atype   uint8
+	dstHost string
+	dstPort string
+	data    []byte
+}
+
+func NewPacketUDP() (p PacketUDP) {
+	return PacketUDP{}
+}
+func (p *PacketUDP) Build(destAddr string, data []byte) (err error) {
+	host, port, err := net.SplitHostPort(destAddr)
+	if err != nil {
+		return
+	}
+	p.rsv = 0
+	p.frag = 0
+	p.dstHost = host
+	p.dstPort = port
+	p.atype = ATYP_IPV4
+	if ip := net.ParseIP(host); ip != nil {
+		if ip4 := ip.To4(); ip4 != nil {
+			p.atype = ATYP_IPV4
+			ip = ip4
+		} else {
+			p.atype = ATYP_IPV6
+		}
+	} else {
+		if len(host) > 255 {
+			err = errors.New("proxy: destination host name too long: " + host)
+			return
+		}
+		p.atype = ATYP_DOMAIN
+	}
+	p.data = data
+
+	return
+}
+func (p *PacketUDP) Parse(b []byte) (err error) {
+	p.frag = uint8(b[2])
+	if p.frag != 0 {
+		err = fmt.Errorf("FRAG only support for 0 , %v ,%v", p.frag, b[:4])
+		return
+	}
+	portIndex := 0
+	p.atype = b[3]
+	switch p.atype {
+	case ATYP_IPV4: //IP V4
+		p.dstHost = net.IPv4(b[4], b[5], b[6], b[7]).String()
+		portIndex = 8
+	case ATYP_DOMAIN: //域名
+		domainLen := uint8(b[4])
+		p.dstHost = string(b[5 : 5+domainLen]) //b[4]表示域名的长度
+		portIndex = int(5 + domainLen)
+	case ATYP_IPV6: //IP V6
+		p.dstHost = net.IP{b[4], b[5], b[6], b[7], b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15], b[16], b[17], b[18], b[19]}.String()
+		portIndex = 20
+	}
+	p.dstPort = strconv.Itoa(int(b[portIndex])<<8 | int(b[portIndex+1]))
+	p.data = b[portIndex+2:]
+	return
+}
+func (p *PacketUDP) Header() []byte {
+	header := new(bytes.Buffer)
+	header.Write([]byte{0x00, 0x00, p.frag, p.atype})
+	if p.atype == ATYP_IPV4 {
+		ip := net.ParseIP(p.dstHost)
+		header.Write(ip.To4())
+	} else if p.atype == ATYP_IPV6 {
+		ip := net.ParseIP(p.dstHost)
+		header.Write(ip.To16())
+	} else if p.atype == ATYP_DOMAIN {
+		hBytes := []byte(p.dstHost)
+		header.WriteByte(byte(len(hBytes)))
+		header.Write(hBytes)
+	}
+	port, _ := strconv.ParseUint(p.dstPort, 10, 64)
+	portBytes := new(bytes.Buffer)
+	binary.Write(portBytes, binary.BigEndian, port)
+	header.Write(portBytes.Bytes()[portBytes.Len()-2:])
+	return header.Bytes()
+}
+func (p *PacketUDP) Bytes() []byte {
+	packBytes := new(bytes.Buffer)
+	packBytes.Write(p.Header())
+	packBytes.Write(p.data)
+	return packBytes.Bytes()
+}
+func (p *PacketUDP) Host() string {
+	return p.dstHost
+}
+
+func (p *PacketUDP) Port() string {
+	return p.dstPort
+}
+func (p *PacketUDP) Data() []byte {
+	return p.data
+}
--- a/core/lib/transport/compress.go
+++ b/core/lib/transport/compress.go
@ -0,0 +1,62 @@
+package transport
+
+import (
+	"net"
+	"time"
+
+	"github.com/golang/snappy"
+)
+
+func NewCompStream(conn net.Conn) *CompStream {
+	c := new(CompStream)
+	c.conn = conn
+	c.w = snappy.NewBufferedWriter(conn)
+	c.r = snappy.NewReader(conn)
+	return c
+}
+func NewCompConn(conn net.Conn) net.Conn {
+	c := CompStream{}
+	c.conn = conn
+	c.w = snappy.NewBufferedWriter(conn)
+	c.r = snappy.NewReader(conn)
+	return &c
+}
+
+type CompStream struct {
+	net.Conn
+	conn net.Conn
+	w    *snappy.Writer
+	r    *snappy.Reader
+}
+
+func (c *CompStream) Read(p []byte) (n int, err error) {
+	return c.r.Read(p)
+}
+
+func (c *CompStream) Write(p []byte) (n int, err error) {
+	n, err = c.w.Write(p)
+	err = c.w.Flush()
+	return n, err
+}
+
+func (c *CompStream) Close() (err error) {
+	err = c.conn.Close()
+	c.r = nil
+	c.w = nil
+	return
+}
+func (c *CompStream) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+func (c *CompStream) RemoteAddr() net.Addr {
+	return c.conn.RemoteAddr()
+}
+func (c *CompStream) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+func (c *CompStream) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+func (c *CompStream) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}
--- a/core/lib/transport/encrypt/conn.go
+++ b/core/lib/transport/encrypt/conn.go
@ -0,0 +1,47 @@
+package encrypt
+
+import (
+	"crypto/cipher"
+	"io"
+	"net"
+
+	lbuf "github.com/snail007/goproxy/core/lib/buf"
+)
+
+var (
+	lBuf = lbuf.NewLeakyBuf(2048, 2048)
+)
+
+type Conn struct {
+	net.Conn
+	*Cipher
+	w io.Writer
+	r io.Reader
+}
+
+func NewConn(c net.Conn, method, password string) (conn net.Conn, err error) {
+	cipher0, err := NewCipher(method, password)
+	if err != nil {
+		return
+	}
+	conn = &Conn{
+		Conn:   c,
+		Cipher: cipher0,
+		r:      &cipher.StreamReader{S: cipher0.ReadStream, R: c},
+		w:      &cipher.StreamWriter{S: cipher0.WriteStream, W: c},
+	}
+	return
+}
+func (s *Conn) Read(b []byte) (n int, err error) {
+	return s.r.Read(b)
+}
+func (s *Conn) Write(b []byte) (n int, err error) {
+	return s.w.Write(b)
+}
+func (s *Conn) Close() (err error) {
+	err = s.Conn.Close()
+	s.Cipher = nil
+	s.r = nil
+	s.w = nil
+	return err
+}
--- a/core/lib/transport/encrypt/encrypt.go
+++ b/core/lib/transport/encrypt/encrypt.go
@ -0,0 +1,185 @@
+package encrypt
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/des"
+	"crypto/md5"
+	"crypto/rc4"
+	"crypto/sha256"
+	"errors"
+
+	lbuf "github.com/snail007/goproxy/core/lib/buf"
+	"github.com/Yawning/chacha20"
+	"golang.org/x/crypto/blowfish"
+	"golang.org/x/crypto/cast5"
+)
+
+const leakyBufSize = 2048
+const maxNBuf = 2048
+
+var leakyBuf = lbuf.NewLeakyBuf(maxNBuf, leakyBufSize)
+var errEmptyPassword = errors.New("proxy key")
+
+func md5sum(d []byte) []byte {
+	h := md5.New()
+	h.Write(d)
+	return h.Sum(nil)
+}
+
+func evpBytesToKey(password string, keyLen int) (key []byte) {
+	const md5Len = 16
+	cnt := (keyLen-1)/md5Len + 1
+	m := make([]byte, cnt*md5Len)
+	copy(m, md5sum([]byte(password)))
+
+	// Repeatedly call md5 until bytes generated is enough.
+	// Each call to md5 uses data: prev md5 sum + password.
+	d := make([]byte, md5Len+len(password))
+	start := 0
+	for i := 1; i < cnt; i++ {
+		start += md5Len
+		copy(d, m[start-md5Len:start])
+		copy(d[md5Len:], password)
+		copy(m[start:], md5sum(d))
+	}
+	return m[:keyLen]
+}
+
+type DecOrEnc int
+
+const (
+	Decrypt DecOrEnc = iota
+	Encrypt
+)
+
+func newStream(block cipher.Block, err error, key, iv []byte,
+	doe DecOrEnc) (cipher.Stream, error) {
+	if err != nil {
+		return nil, err
+	}
+	if doe == Encrypt {
+		return cipher.NewCFBEncrypter(block, iv), nil
+	} else {
+		return cipher.NewCFBDecrypter(block, iv), nil
+	}
+}
+
+func newAESCFBStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := aes.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newAESCTRStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewCTR(block, iv), nil
+}
+
+func newDESStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := des.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newBlowFishStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := blowfish.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newCast5Stream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := cast5.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newRC4MD5Stream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	h := md5.New()
+	h.Write(key)
+	h.Write(iv)
+	rc4key := h.Sum(nil)
+
+	return rc4.NewCipher(rc4key)
+}
+
+func newChaCha20Stream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	return chacha20.NewCipher(key, iv)
+}
+
+func newChaCha20IETFStream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	return chacha20.NewCipher(key, iv)
+}
+
+type cipherInfo struct {
+	keyLen    int
+	ivLen     int
+	newStream func(key, iv []byte, doe DecOrEnc) (cipher.Stream, error)
+}
+
+var cipherMethod = map[string]*cipherInfo{
+	"aes-128-cfb":   {16, 16, newAESCFBStream},
+	"aes-192-cfb":   {24, 16, newAESCFBStream},
+	"aes-256-cfb":   {32, 16, newAESCFBStream},
+	"aes-128-ctr":   {16, 16, newAESCTRStream},
+	"aes-192-ctr":   {24, 16, newAESCTRStream},
+	"aes-256-ctr":   {32, 16, newAESCTRStream},
+	"des-cfb":       {8, 8, newDESStream},
+	"bf-cfb":        {16, 8, newBlowFishStream},
+	"cast5-cfb":     {16, 8, newCast5Stream},
+	"rc4-md5":       {16, 16, newRC4MD5Stream},
+	"rc4-md5-6":     {16, 6, newRC4MD5Stream},
+	"chacha20":      {32, 8, newChaCha20Stream},
+	"chacha20-ietf": {32, 12, newChaCha20IETFStream},
+}
+
+func GetCipherMethods() (keys []string) {
+	keys = []string{}
+	for k := range cipherMethod {
+		keys = append(keys, k)
+	}
+	return
+}
+func CheckCipherMethod(method string) error {
+	if method == "" {
+		method = "aes-256-cfb"
+	}
+	_, ok := cipherMethod[method]
+	if !ok {
+		return errors.New("Unsupported encryption method: " + method)
+	}
+	return nil
+}
+
+type Cipher struct {
+	WriteStream cipher.Stream
+	ReadStream  cipher.Stream
+	key         []byte
+	info        *cipherInfo
+}
+
+func NewCipher(method, password string) (c *Cipher, err error) {
+	if password == "" {
+		return nil, errEmptyPassword
+	}
+	mi, ok := cipherMethod[method]
+	if !ok {
+		return nil, errors.New("Unsupported encryption method: " + method)
+	}
+	key := evpBytesToKey(password, mi.keyLen)
+	c = &Cipher{key: key, info: mi}
+	if err != nil {
+		return nil, err
+	}
+	//hash(key) -> read IV
+	riv := sha256.New().Sum(c.key)[:c.info.ivLen]
+	c.ReadStream, err = c.info.newStream(c.key, riv, Decrypt)
+	if err != nil {
+		return nil, err
+	} //hash(read IV) -> write IV
+	wiv := sha256.New().Sum(riv)[:c.info.ivLen]
+	c.WriteStream, err = c.info.newStream(c.key, wiv, Encrypt)
+	if err != nil {
+		return nil, err
+	}
+	return c, nil
+}
--- a/core/lib/udp/udp.go
+++ b/core/lib/udp/udp.go
@ -0,0 +1,234 @@
+package udputils
+
+import (
+	"fmt"
+	logger "log"
+	"net"
+	"runtime/debug"
+	"strings"
+	"time"
+
+	bufx "github.com/snail007/goproxy/core/lib/buf"
+	mapx "github.com/snail007/goproxy/core/lib/mapx"
+)
+
+type CreateOutUDPConnFn func(listener *net.UDPConn, srcAddr *net.UDPAddr, packet []byte) (outconn *net.UDPConn, err error)
+type CleanFn func(srcAddr string)
+type BeforeSendFn func(listener *net.UDPConn, srcAddr *net.UDPAddr, b []byte) (sendB []byte, err error)
+type BeforeReplyFn func(listener *net.UDPConn, srcAddr *net.UDPAddr, outconn *net.UDPConn, b []byte) (replyB []byte, err error)
+
+type IOBinder struct {
+	outConns           mapx.ConcurrentMap
+	listener           *net.UDPConn
+	createOutUDPConnFn CreateOutUDPConnFn
+	log                *logger.Logger
+	timeout            time.Duration
+	cleanFn            CleanFn
+	inTCPConn          *net.Conn
+	outTCPConn         *net.Conn
+	beforeSendFn       BeforeSendFn
+	beforeReplyFn      BeforeReplyFn
+}
+
+func NewIOBinder(listener *net.UDPConn, log *logger.Logger) *IOBinder {
+	return &IOBinder{
+		listener: listener,
+		outConns: mapx.NewConcurrentMap(),
+		log:      log,
+	}
+}
+func (s *IOBinder) Factory(fn CreateOutUDPConnFn) *IOBinder {
+	s.createOutUDPConnFn = fn
+	return s
+}
+func (s *IOBinder) AfterReadFromClient(fn BeforeSendFn) *IOBinder {
+	s.beforeSendFn = fn
+	return s
+}
+func (s *IOBinder) AfterReadFromServer(fn BeforeReplyFn) *IOBinder {
+	s.beforeReplyFn = fn
+	return s
+}
+func (s *IOBinder) Timeout(timeout time.Duration) *IOBinder {
+	s.timeout = timeout
+	return s
+}
+func (s *IOBinder) Clean(fn CleanFn) *IOBinder {
+	s.cleanFn = fn
+	return s
+}
+func (s *IOBinder) AliveWithServeConn(srcAddr string, inTCPConn *net.Conn) *IOBinder {
+	s.inTCPConn = inTCPConn
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		buf := make([]byte, 1)
+		(*inTCPConn).SetReadDeadline(time.Time{})
+		if _, err := (*inTCPConn).Read(buf); err != nil {
+			s.log.Printf("udp related tcp conn of client disconnected with read , %s", err.Error())
+			s.clean(srcAddr)
+		}
+	}()
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		for {
+			(*inTCPConn).SetWriteDeadline(time.Now().Add(time.Second * 5))
+			if _, err := (*inTCPConn).Write([]byte{0x00}); err != nil {
+				s.log.Printf("udp related tcp conn of client disconnected with write , %s", err.Error())
+				s.clean(srcAddr)
+				return
+			}
+			(*inTCPConn).SetWriteDeadline(time.Time{})
+			time.Sleep(time.Second * 5)
+		}
+	}()
+	return s
+}
+func (s *IOBinder) AliveWithClientConn(srcAddr string, outTCPConn *net.Conn) *IOBinder {
+	s.outTCPConn = outTCPConn
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		buf := make([]byte, 1)
+		(*outTCPConn).SetReadDeadline(time.Time{})
+		if _, err := (*outTCPConn).Read(buf); err != nil {
+			s.log.Printf("udp related tcp conn to parent disconnected with read , %s", err.Error())
+			s.clean(srcAddr)
+		}
+	}()
+	return s
+}
+func (s *IOBinder) Run() (err error) {
+	var (
+		isClosedErr = func(err error) bool {
+			return err != nil && strings.Contains(err.Error(), "use of closed network connection")
+		}
+		isTimeoutErr = func(err error) bool {
+			if err == nil {
+				return false
+			}
+			e, ok := err.(net.Error)
+			return ok && e.Timeout()
+		}
+		isRefusedErr = func(err error) bool {
+			return err != nil && strings.Contains(err.Error(), "connection refused")
+		}
+	)
+	for {
+		buf := bufx.Get()
+		defer bufx.Put(buf)
+		n, srcAddr, err := s.listener.ReadFromUDP(buf)
+		if err != nil {
+			s.log.Printf("read from client error %s", err)
+			if isClosedErr(err) {
+				return err
+			}
+			continue
+		}
+		var data []byte
+		if s.beforeSendFn != nil {
+			data, err = s.beforeSendFn(s.listener, srcAddr, buf[:n])
+			if err != nil {
+				s.log.Printf("beforeSend retured an error , %s", err)
+				continue
+			}
+		} else {
+			data = buf[:n]
+		}
+		inconnRemoteAddr := srcAddr.String()
+		var outconn *net.UDPConn
+		if v, ok := s.outConns.Get(inconnRemoteAddr); !ok {
+			outconn, err = s.createOutUDPConnFn(s.listener, srcAddr, data)
+			if err != nil {
+				s.log.Printf("connnect fail %s", err)
+				return err
+			}
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+					}
+				}()
+				defer func() {
+					s.clean(srcAddr.String())
+				}()
+				buf := bufx.Get()
+				defer bufx.Put(buf)
+				for {
+					if s.timeout > 0 {
+						outconn.SetReadDeadline(time.Now().Add(s.timeout))
+					}
+					n, srcAddr, err := outconn.ReadFromUDP(buf)
+					if err != nil {
+						s.log.Printf("read from remote error %s", err)
+						if isClosedErr(err) || isTimeoutErr(err) || isRefusedErr(err) {
+							return
+						}
+						continue
+					}
+					data := buf[:n]
+					if s.beforeReplyFn != nil {
+						data, err = s.beforeReplyFn(s.listener, srcAddr, outconn, buf[:n])
+						if err != nil {
+							s.log.Printf("beforeReply retured an error , %s", err)
+							continue
+						}
+					}
+					_, err = s.listener.WriteTo(data, srcAddr)
+					if err != nil {
+						s.log.Printf("write to remote error %s", err)
+						if isClosedErr(err) {
+							return
+						}
+						continue
+					}
+				}
+			}()
+		} else {
+			outconn = v.(*net.UDPConn)
+		}
+
+		s.log.Printf("use decrpyted data , %v", data)
+
+		_, err = outconn.Write(data)
+
+		if err != nil {
+			s.log.Printf("write to remote error %s", err)
+			if isClosedErr(err) {
+				return err
+			}
+		}
+	}
+}
+func (s *IOBinder) clean(srcAddr string) *IOBinder {
+	if v, ok := s.outConns.Get(srcAddr); ok {
+		(*v.(*net.UDPConn)).Close()
+		s.outConns.Remove(srcAddr)
+	}
+	if s.inTCPConn != nil {
+		(*s.inTCPConn).Close()
+	}
+	if s.outTCPConn != nil {
+		(*s.outTCPConn).Close()
+	}
+	if s.cleanFn != nil {
+		s.cleanFn(srcAddr)
+	}
+	return s
+}
+
+func (s *IOBinder) Close() {
+	for _, c := range s.outConns.Items() {
+		(*c.(*net.UDPConn)).Close()
+	}
+}
--- a/core/proxy/client/proxy.go
+++ b/core/proxy/client/proxy.go
@ -0,0 +1,31 @@
+// Package proxy provides support for a variety of protocols to proxy network
+// data.
+package client
+
+import (
+	"net"
+	"time"
+
+	socks5c "github.com/snail007/goproxy/core/lib/socks5"
+	socks5 "github.com/snail007/goproxy/core/proxy/client/socks5"
+)
+
+// A Dialer is a means to establish a connection.
+type Dialer interface {
+	// Dial connects to the given address via the proxy.
+	DialConn(conn *net.Conn, network, addr string) (err error)
+}
+
+// Auth contains authentication parameters that specific Dialers may require.
+type Auth struct {
+	User, Password string
+}
+
+func SOCKS5(timeout time.Duration, auth *Auth) (Dialer, error) {
+	var a *socks5c.UsernamePassword
+	if auth != nil {
+		a = &socks5c.UsernamePassword{auth.User, auth.Password}
+	}
+	d := socks5.NewDialer(a, timeout)
+	return d, nil
+}
--- a/core/proxy/client/socks5/socks5.go
+++ b/core/proxy/client/socks5/socks5.go
@ -0,0 +1,263 @@
+package socks5
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+	"time"
+
+	socks5c "github.com/snail007/goproxy/core/lib/socks5"
+)
+
+type Dialer struct {
+	timeout          time.Duration
+	usernamePassword *socks5c.UsernamePassword
+}
+
+// NewDialer returns a new Dialer that dials through the provided
+// proxy server's network and address.
+func NewDialer(auth *socks5c.UsernamePassword, timeout time.Duration) *Dialer {
+	if auth != nil && auth.Password == "" && auth.Username == "" {
+		auth = nil
+	}
+	return &Dialer{
+		usernamePassword: auth,
+		timeout:          timeout,
+	}
+}
+
+func (d *Dialer) DialConn(conn *net.Conn, network, addr string) (err error) {
+	client := NewClientConn(conn, network, addr, d.timeout, d.usernamePassword, nil)
+	err = client._Handshake()
+	return
+}
+
+type ClientConn struct {
+	user     string
+	password string
+	conn     *net.Conn
+	header   []byte
+	timeout  time.Duration
+	addr     string
+	network  string
+	udpAddr  string
+}
+
+// SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address
+// with an optional username and password. See RFC 1928 and RFC 1929.
+// target must be a canonical address with a host and port.
+// network : tcp udp
+func NewClientConn(conn *net.Conn, network, target string, timeout time.Duration, auth *socks5c.UsernamePassword, header []byte) *ClientConn {
+	s := &ClientConn{
+		conn:    conn,
+		network: network,
+		timeout: timeout,
+	}
+	if auth != nil {
+		s.user = auth.Username
+		s.password = auth.Password
+	}
+	if header != nil && len(header) > 0 {
+		s.header = header
+	}
+	if network == "udp" && target == "" {
+		target = "0.0.0.0:1"
+	}
+	s.addr = target
+	return s
+}
+
+// connect takes an existing connection to a socks5 proxy server,
+// and commands the server to extend that connection to target,
+// which must be a canonical address with a host and port.
+func (s *ClientConn) _Handshake() error {
+	host, portStr, err := net.SplitHostPort(s.addr)
+	if err != nil {
+		return err
+	}
+	port, err := strconv.Atoi(portStr)
+	if err != nil {
+		return errors.New("proxy: failed to parse port number: " + portStr)
+	}
+	if port < 1 || port > 0xffff {
+		return errors.New("proxy: port number out of range: " + portStr)
+	}
+
+	if err := s.auth(host); err != nil {
+		return err
+	}
+	buf := []byte{}
+	if s.network == "tcp" {
+		buf = append(buf, socks5c.VERSION_V5, socks5c.CMD_CONNECT, 0 /* reserved */)
+
+	} else {
+		buf = append(buf, socks5c.VERSION_V5, socks5c.CMD_ASSOCIATE, 0 /* reserved */)
+	}
+	if ip := net.ParseIP(host); ip != nil {
+		if ip4 := ip.To4(); ip4 != nil {
+			buf = append(buf, socks5c.ATYP_IPV4)
+			ip = ip4
+		} else {
+			buf = append(buf, socks5c.ATYP_IPV6)
+		}
+		buf = append(buf, ip...)
+	} else {
+		if len(host) > 255 {
+			return errors.New("proxy: destination host name too long: " + host)
+		}
+		buf = append(buf, socks5c.ATYP_DOMAIN)
+		buf = append(buf, byte(len(host)))
+		buf = append(buf, host...)
+	}
+	buf = append(buf, byte(port>>8), byte(port))
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := (*s.conn).Write(buf); err != nil {
+		return errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	(*s.conn).SetDeadline(time.Time{})
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := io.ReadFull((*s.conn), buf[:4]); err != nil {
+		return errors.New("proxy: failed to read connect reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	(*s.conn).SetDeadline(time.Time{})
+	failure := "unknown error"
+	if int(buf[1]) < len(socks5c.Socks5Errors) {
+		failure = socks5c.Socks5Errors[buf[1]]
+	}
+
+	if len(failure) > 0 {
+		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
+	}
+
+	bytesToDiscard := 0
+	switch buf[3] {
+	case socks5c.ATYP_IPV4:
+		bytesToDiscard = net.IPv4len
+	case socks5c.ATYP_IPV6:
+		bytesToDiscard = net.IPv6len
+	case socks5c.ATYP_DOMAIN:
+		(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+		_, err := io.ReadFull((*s.conn), buf[:1])
+		(*s.conn).SetDeadline(time.Time{})
+		if err != nil {
+			return errors.New("proxy: failed to read domain length from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		}
+		bytesToDiscard = int(buf[0])
+	default:
+		return errors.New("proxy: got unknown address type " + strconv.Itoa(int(buf[3])) + " from SOCKS5 proxy at " + s.addr)
+	}
+
+	if cap(buf) < bytesToDiscard {
+		buf = make([]byte, bytesToDiscard)
+	} else {
+		buf = buf[:bytesToDiscard]
+	}
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := io.ReadFull((*s.conn), buf); err != nil {
+		return errors.New("proxy: failed to read address from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	(*s.conn).SetDeadline(time.Time{})
+	var ip net.IP
+	ip = buf
+	ipStr := ""
+	if bytesToDiscard == net.IPv4len || bytesToDiscard == net.IPv6len {
+		if ipv4 := ip.To4(); ipv4 != nil {
+			ipStr = ipv4.String()
+		} else {
+			ipStr = ip.To16().String()
+		}
+	}
+	//log.Printf("%v", ipStr)
+	// Also need to discard the port number
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := io.ReadFull((*s.conn), buf[:2]); err != nil {
+		return errors.New("proxy: failed to read port from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	p := binary.BigEndian.Uint16([]byte{buf[0], buf[1]})
+	//log.Printf("%v", p)
+	s.udpAddr = net.JoinHostPort(ipStr, fmt.Sprintf("%d", p))
+	//log.Printf("%v", s.udpAddr)
+	(*s.conn).SetDeadline(time.Time{})
+	return nil
+}
+func (s *ClientConn) SendUDP(data []byte, addr string) (respData []byte, err error) {
+
+	c, err := net.DialTimeout("udp", s.udpAddr, s.timeout)
+	if err != nil {
+		return
+	}
+	conn := c.(*net.UDPConn)
+
+	p := socks5c.NewPacketUDP()
+	p.Build(addr, data)
+	conn.SetDeadline(time.Now().Add(s.timeout))
+	conn.Write(p.Bytes())
+	conn.SetDeadline(time.Time{})
+
+	buf := make([]byte, 1024)
+	conn.SetDeadline(time.Now().Add(s.timeout))
+	n, _, err := conn.ReadFrom(buf)
+	conn.SetDeadline(time.Time{})
+	if err != nil {
+		return
+	}
+	respData = buf[:n]
+	return
+}
+func (s *ClientConn) auth(host string) error {
+
+	// the size here is just an estimate
+	buf := make([]byte, 0, 6+len(host))
+
+	buf = append(buf, socks5c.VERSION_V5)
+	if len(s.user) > 0 && len(s.user) < 256 && len(s.password) < 256 {
+		buf = append(buf, 2 /* num auth methods */, socks5c.Method_NO_AUTH, socks5c.Method_USER_PASS)
+	} else {
+		buf = append(buf, 1 /* num auth methods */, socks5c.Method_NO_AUTH)
+	}
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := (*s.conn).Write(buf); err != nil {
+		return errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	(*s.conn).SetDeadline(time.Time{})
+
+	(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+	if _, err := io.ReadFull((*s.conn), buf[:2]); err != nil {
+		return errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+	}
+	(*s.conn).SetDeadline(time.Time{})
+
+	if buf[0] != 5 {
+		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
+	}
+	if buf[1] == 0xff {
+		return errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
+	}
+
+	// See RFC 1929
+	if buf[1] == socks5c.Method_USER_PASS {
+		buf = buf[:0]
+		buf = append(buf, 1 /* password protocol version */)
+		buf = append(buf, uint8(len(s.user)))
+		buf = append(buf, s.user...)
+		buf = append(buf, uint8(len(s.password)))
+		buf = append(buf, s.password...)
+		(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+		if _, err := (*s.conn).Write(buf); err != nil {
+			return errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		}
+		(*s.conn).SetDeadline(time.Time{})
+		(*s.conn).SetDeadline(time.Now().Add(s.timeout))
+		if _, err := io.ReadFull((*s.conn), buf[:2]); err != nil {
+			return errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+		}
+		(*s.conn).SetDeadline(time.Time{})
+		if buf[1] != 0 {
+			return errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
+		}
+	}
+	return nil
+}
--- a/core/proxy/client/tests/proxy_test.go
+++ b/core/proxy/client/tests/proxy_test.go
@ -0,0 +1,79 @@
+package tests
+
+import (
+	"io/ioutil"
+	"net"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	proxyclient "github.com/snail007/goproxy/core/proxy/client"
+	sdk "github.com/snail007/goproxy/sdk/android-ios"
+)
+
+func TestSocks5(t *testing.T) {
+	estr := sdk.Start("s1", "socks -p :8185 --log test.log")
+	if estr != "" {
+		t.Fatal(estr)
+	}
+	p, e := proxyclient.SOCKS5(time.Second, nil)
+	if e != nil {
+		t.Error(e)
+	} else {
+		c, e := net.Dial("tcp", "127.0.0.1:8185")
+		if e != nil {
+			t.Fatal(e)
+		}
+		e = p.DialConn(&c, "tcp", "www.baidu.com:80")
+		if e != nil {
+			t.Fatal(e)
+		}
+		_, e = c.Write([]byte("Get / http/1.1\r\nHost: www.baidu.com\r\n"))
+		if e != nil {
+			t.Fatal(e)
+		}
+		b, e := ioutil.ReadAll(c)
+		if e != nil {
+			t.Fatal(e)
+		}
+		if !strings.HasPrefix(string(b), "HTTP") {
+			t.Fatalf("request baidu fail:%s", string(b))
+		}
+	}
+	sdk.Stop("s1")
+	os.Remove("test.log")
+}
+
+func TestSocks5Auth(t *testing.T) {
+	estr := sdk.Start("s1", "socks -p :8185 -a u:p --log test.log")
+	if estr != "" {
+		t.Fatal(estr)
+	}
+	p, e := proxyclient.SOCKS5(time.Second, &proxyclient.Auth{User: "u", Password: "p"})
+	if e != nil {
+		t.Error(e)
+	} else {
+		c, e := net.Dial("tcp", "127.0.0.1:8185")
+		if e != nil {
+			t.Fatal(e)
+		}
+		e = p.DialConn(&c, "tcp", "www.baidu.com:80")
+		if e != nil {
+			t.Fatal(e)
+		}
+		_, e = c.Write([]byte("Get / http/1.1\r\nHost: www.baidu.com\r\n"))
+		if e != nil {
+			t.Fatal(e)
+		}
+		b, e := ioutil.ReadAll(c)
+		if e != nil {
+			t.Fatal(e)
+		}
+		if !strings.HasPrefix(string(b), "HTTP") {
+			t.Fatalf("request baidu fail:%s", string(b))
+		}
+	}
+	sdk.Stop("s1")
+	os.Remove("test.log")
+}
--- a/core/proxy/server/socks5/server.go
+++ b/core/proxy/server/socks5/server.go
@ -0,0 +1,373 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+	"strings"
+	"time"
+
+	socks5c "github.com/snail007/goproxy/core/lib/socks5"
+)
+
+type BasicAuther interface {
+	CheckUserPass(username, password, fromIP, ToTarget string) bool
+}
+type Request struct {
+	ver         uint8
+	cmd         uint8
+	reserve     uint8
+	addressType uint8
+	dstAddr     string
+	dstPort     string
+	dstHost     string
+	bytes       []byte
+	rw          io.ReadWriter
+}
+
+func NewRequest(rw io.ReadWriter, header ...[]byte) (req Request, err interface{}) {
+	var b = make([]byte, 1024)
+	var n int
+	req = Request{rw: rw}
+	if header != nil && len(header) == 1 && len(header[0]) > 1 {
+		b = header[0]
+		n = len(header[0])
+	} else {
+		n, err = rw.Read(b[:])
+		if err != nil {
+			err = fmt.Errorf("read req data fail,ERR: %s", err)
+			return
+		}
+	}
+	req.ver = uint8(b[0])
+	req.cmd = uint8(b[1])
+	req.reserve = uint8(b[2])
+	req.addressType = uint8(b[3])
+	if b[0] != 0x5 {
+		err = fmt.Errorf("sosck version supported")
+		req.TCPReply(socks5c.REP_REQ_FAIL)
+		return
+	}
+	switch b[3] {
+	case 0x01: //IP V4
+		req.dstHost = net.IPv4(b[4], b[5], b[6], b[7]).String()
+	case 0x03: //域名
+		req.dstHost = string(b[5 : n-2]) //b[4]表示域名的长度
+	case 0x04: //IP V6
+		req.dstHost = net.IP{b[4], b[5], b[6], b[7], b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15], b[16], b[17], b[18], b[19]}.String()
+	}
+	req.dstPort = strconv.Itoa(int(b[n-2])<<8 | int(b[n-1]))
+	req.dstAddr = net.JoinHostPort(req.dstHost, req.dstPort)
+	req.bytes = b[:n]
+	return
+}
+func (s *Request) Bytes() []byte {
+	return s.bytes
+}
+func (s *Request) Addr() string {
+	return s.dstAddr
+}
+func (s *Request) Host() string {
+	return s.dstHost
+}
+func (s *Request) Port() string {
+	return s.dstPort
+}
+func (s *Request) AType() uint8 {
+	return s.addressType
+}
+func (s *Request) CMD() uint8 {
+	return s.cmd
+}
+
+func (s *Request) TCPReply(rep uint8) (err error) {
+	_, err = s.rw.Write(s.NewReply(rep, "0.0.0.0:0"))
+	return
+}
+func (s *Request) UDPReply(rep uint8, addr string) (err error) {
+	_, err = s.rw.Write(s.NewReply(rep, addr))
+	return
+}
+func (s *Request) NewReply(rep uint8, addr string) []byte {
+	var response bytes.Buffer
+	host, port, _ := net.SplitHostPort(addr)
+	ip := net.ParseIP(host)
+	ipb := ip.To4()
+	atyp := socks5c.ATYP_IPV4
+	ipv6 := ip.To16()
+	zeroiIPv6 := fmt.Sprintf("%d%d%d%d%d%d%d%d%d%d%d%d",
+		ipv6[0], ipv6[1], ipv6[2], ipv6[3],
+		ipv6[4], ipv6[5], ipv6[6], ipv6[7],
+		ipv6[8], ipv6[9], ipv6[10], ipv6[11],
+	)
+	if ipb == nil && ipv6 != nil && "0000000000255255" != zeroiIPv6 {
+		atyp = socks5c.ATYP_IPV6
+		ipb = ip.To16()
+	}
+	porti, _ := strconv.Atoi(port)
+	portb := make([]byte, 2)
+	binary.BigEndian.PutUint16(portb, uint16(porti))
+	// log.Printf("atyp : %v", atyp)
+	// log.Printf("ip : %v", []byte(ip))
+	response.WriteByte(socks5c.VERSION_V5)
+	response.WriteByte(rep)
+	response.WriteByte(socks5c.RSV)
+	response.WriteByte(atyp)
+	response.Write(ipb)
+	response.Write(portb)
+	return response.Bytes()
+}
+
+type MethodsRequest struct {
+	ver          uint8
+	methodsCount uint8
+	methods      []uint8
+	bytes        []byte
+	rw           *io.ReadWriter
+}
+
+func NewMethodsRequest(r io.ReadWriter, header ...[]byte) (s MethodsRequest, err interface{}) {
+	defer func() {
+		if err == nil {
+			err = recover()
+		}
+	}()
+	s = MethodsRequest{}
+	s.rw = &r
+	var buf = make([]byte, 300)
+	var n int
+	if header != nil && len(header) == 1 && len(header[0]) > 1 {
+		buf = header[0]
+		n = len(header[0])
+	} else {
+		n, err = r.Read(buf)
+		if err != nil {
+			return
+		}
+	}
+	if buf[0] != 0x05 {
+		err = fmt.Errorf("socks version not supported")
+		return
+	}
+	if n != int(buf[1])+int(2) {
+		err = fmt.Errorf("socks methods data length error")
+		return
+	}
+	s.ver = buf[0]
+	s.methodsCount = buf[1]
+	s.methods = buf[2:n]
+	s.bytes = buf[:n]
+	return
+}
+func (s *MethodsRequest) Version() uint8 {
+	return s.ver
+}
+func (s *MethodsRequest) MethodsCount() uint8 {
+	return s.methodsCount
+}
+func (s *MethodsRequest) Methods() []uint8 {
+	return s.methods
+}
+func (s *MethodsRequest) Select(method uint8) bool {
+	for _, m := range s.methods {
+		if m == method {
+			return true
+		}
+	}
+	return false
+}
+func (s *MethodsRequest) Reply(method uint8) (err error) {
+	_, err = (*s.rw).Write([]byte{byte(socks5c.VERSION_V5), byte(method)})
+	return
+}
+func (s *MethodsRequest) Bytes() []byte {
+	return s.bytes
+}
+
+type ServerConn struct {
+	target   string
+	user     string
+	password string
+	conn     *net.Conn
+	timeout  time.Duration
+	auth     *BasicAuther
+	header   []byte
+	ver      uint8
+	//method
+	methodsCount uint8
+	methods      []uint8
+	method       uint8
+	//request
+	cmd         uint8
+	reserve     uint8
+	addressType uint8
+	dstAddr     string
+	dstPort     string
+	dstHost     string
+	udpAddress  string
+}
+
+func NewServerConn(conn *net.Conn, timeout time.Duration, auth *BasicAuther, udpAddress string, header []byte) *ServerConn {
+	if udpAddress == "" {
+		udpAddress = "0.0.0.0:16666"
+	}
+	s := &ServerConn{
+		conn:       conn,
+		timeout:    timeout,
+		auth:       auth,
+		header:     header,
+		ver:        socks5c.VERSION_V5,
+		udpAddress: udpAddress,
+	}
+	return s
+
+}
+func (s *ServerConn) Close() {
+	(*s.conn).Close()
+}
+func (s *ServerConn) AuthData() socks5c.UsernamePassword {
+	return socks5c.UsernamePassword{s.user, s.password}
+}
+func (s *ServerConn) Method() uint8 {
+	return s.method
+}
+func (s *ServerConn) Target() string {
+	return s.target
+}
+func (s *ServerConn) Handshake() (err error) {
+	remoteAddr := (*s.conn).RemoteAddr()
+	//协商开始
+	//method select request
+	var methodReq MethodsRequest
+	(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+
+	methodReq, e := NewMethodsRequest((*s.conn), s.header)
+	(*s.conn).SetReadDeadline(time.Time{})
+	if e != nil {
+		(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+		methodReq.Reply(socks5c.Method_NONE_ACCEPTABLE)
+		(*s.conn).SetReadDeadline(time.Time{})
+		err = fmt.Errorf("new methods request fail,ERR: %s", e)
+		return
+	}
+	//log.Printf("%v,s.auth == %v && methodReq.Select(Method_NO_AUTH) %v", methodReq.methods, s.auth, methodReq.Select(Method_NO_AUTH))
+	if s.auth == nil && methodReq.Select(socks5c.Method_NO_AUTH) && !methodReq.Select(socks5c.Method_USER_PASS) {
+		// if !methodReq.Select(Method_NO_AUTH) {
+		// 	(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+		// 	methodReq.Reply(Method_NONE_ACCEPTABLE)
+		// 	(*s.conn).SetReadDeadline(time.Time{})
+		// 	err = fmt.Errorf("none method found : Method_NO_AUTH")
+		// 	return
+		// }
+		s.method = socks5c.Method_NO_AUTH
+		//method select reply
+		(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+		err = methodReq.Reply(socks5c.Method_NO_AUTH)
+		(*s.conn).SetReadDeadline(time.Time{})
+		if err != nil {
+			err = fmt.Errorf("reply answer data fail,ERR: %s", err)
+			return
+		}
+		// err = fmt.Errorf("% x", methodReq.Bytes())
+	} else {
+		//auth
+		if !methodReq.Select(socks5c.Method_USER_PASS) {
+			(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+			methodReq.Reply(socks5c.Method_NONE_ACCEPTABLE)
+			(*s.conn).SetReadDeadline(time.Time{})
+			err = fmt.Errorf("none method found : Method_USER_PASS")
+			return
+		}
+		s.method = socks5c.Method_USER_PASS
+		//method reply need auth
+		(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+		err = methodReq.Reply(socks5c.Method_USER_PASS)
+		(*s.conn).SetReadDeadline(time.Time{})
+		if err != nil {
+			err = fmt.Errorf("reply answer data fail,ERR: %s", err)
+			return
+		}
+		//read auth
+		buf := make([]byte, 500)
+		var n int
+		(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+		n, err = (*s.conn).Read(buf)
+		(*s.conn).SetReadDeadline(time.Time{})
+		if err != nil {
+			err = fmt.Errorf("read auth info fail,ERR: %s", err)
+			return
+		}
+		r := buf[:n]
+		s.user = string(r[2 : r[1]+2])
+		s.password = string(r[2+r[1]+1:])
+		//err = fmt.Errorf("user:%s,pass:%s", user, pass)
+		//auth
+		_addr := strings.Split(remoteAddr.String(), ":")
+		if s.auth == nil || (*s.auth).CheckUserPass(s.user, s.password, _addr[0], "") {
+			(*s.conn).SetDeadline(time.Now().Add(time.Millisecond * time.Duration(s.timeout)))
+			_, err = (*s.conn).Write([]byte{0x01, 0x00})
+			(*s.conn).SetDeadline(time.Time{})
+			if err != nil {
+				err = fmt.Errorf("answer auth success to %s fail,ERR: %s", remoteAddr, err)
+				return
+			}
+		} else {
+			(*s.conn).SetDeadline(time.Now().Add(time.Millisecond * time.Duration(s.timeout)))
+			_, err = (*s.conn).Write([]byte{0x01, 0x01})
+			(*s.conn).SetDeadline(time.Time{})
+			if err != nil {
+				err = fmt.Errorf("answer auth fail to %s fail,ERR: %s", remoteAddr, err)
+				return
+			}
+			err = fmt.Errorf("auth fail from %s", remoteAddr)
+			return
+		}
+	}
+	//request detail
+	(*s.conn).SetReadDeadline(time.Now().Add(time.Second * s.timeout))
+	request, e := NewRequest(*s.conn)
+	(*s.conn).SetReadDeadline(time.Time{})
+	if e != nil {
+		err = fmt.Errorf("read request data fail,ERR: %s", e)
+		return
+	}
+	//协商结束
+
+	switch request.CMD() {
+	case socks5c.CMD_BIND:
+		err = request.TCPReply(socks5c.REP_UNKNOWN)
+		if err != nil {
+			err = fmt.Errorf("TCPReply REP_UNKNOWN to %s fail,ERR: %s", remoteAddr, err)
+			return
+		}
+		err = fmt.Errorf("cmd bind not supported, form: %s", remoteAddr)
+		return
+	case socks5c.CMD_CONNECT:
+		err = request.TCPReply(socks5c.REP_SUCCESS)
+		if err != nil {
+			err = fmt.Errorf("TCPReply REP_SUCCESS to %s fail,ERR: %s", remoteAddr, err)
+			return
+		}
+	case socks5c.CMD_ASSOCIATE:
+		err = request.UDPReply(socks5c.REP_SUCCESS, s.udpAddress)
+		if err != nil {
+			err = fmt.Errorf("UDPReply REP_SUCCESS to %s fail,ERR: %s", remoteAddr, err)
+			return
+		}
+	}
+
+	//fill socks info
+	s.target = request.Addr()
+	s.methodsCount = methodReq.MethodsCount()
+	s.methods = methodReq.Methods()
+	s.cmd = request.CMD()
+	s.reserve = request.reserve
+	s.addressType = request.addressType
+	s.dstAddr = request.dstAddr
+	s.dstHost = request.dstHost
+	s.dstPort = request.dstPort
+	return
+}
--- a/core/tproxy/README.md
+++ b/core/tproxy/README.md
@ -0,0 +1,35 @@
+# 透传用户IP手册
+
+说明:
+
+通过Linux的TPROXY功能,可以实现源站服务程序可以看见客户端真实IP,实现该功能需要linux操作系统和程序都要满足一定的条件.
+
+环境要求:
+
+源站必须是运行在Linux上面的服务程序,同时Linux需要满足下面条件:
+
+1.Linux内核版本 >= 2.6.28
+
+2.判断系统是否支持TPROXY,执行:
+
+    grep TPROXY /boot/config-`uname -r`
+
+    如果输出有下面的结果说明支持.
+
+    CONFIG_NETFILTER_XT_TARGET_TPROXY=m
+
+部署步骤:
+
+1.在源站的linux系统里面每次开机启动都要用root权限执行tproxy环境设置脚本:tproxy_setup.sh
+
+2.在源站的linux系统里面使用root权限执行代理proxy
+
+参数 -tproxy 是开启代理的tproxy功能.
+
+./proxy -tproxy
+
+2.源站的程序监听的地址IP需要使用:127.0.1.1
+
+比如源站以前监听的地址是: 0.0.0.0:8800 , 现在需要修改为:127.0.1.1:8800
+
+3.转发规则里面源站地址必须是对应的,比如上面的:127.0.1.1:8800
--- a/core/tproxy/tproxy.go
+++ b/core/tproxy/tproxy.go
@ -0,0 +1,249 @@
+// Package tproxy provides the TCPDial and TCPListen tproxy equivalent of the
+// net package Dial and Listen with tproxy support for linux ONLY.
+package tproxy
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+const big = 0xFFFFFF
+const IP_ORIGADDRS = 20
+
+// Debug outs the library in Debug mode
+var Debug = false
+
+func ipToSocksAddr(family int, ip net.IP, port int, zone string) (unix.Sockaddr, error) {
+	switch family {
+	case unix.AF_INET:
+		if len(ip) == 0 {
+			ip = net.IPv4zero
+		}
+		if ip = ip.To4(); ip == nil {
+			return nil, net.InvalidAddrError("non-IPv4 address")
+		}
+		sa := new(unix.SockaddrInet4)
+		for i := 0; i < net.IPv4len; i++ {
+			sa.Addr[i] = ip[i]
+		}
+		sa.Port = port
+		return sa, nil
+	case unix.AF_INET6:
+		if len(ip) == 0 {
+			ip = net.IPv6zero
+		}
+		// IPv4 callers use 0.0.0.0 to mean "announce on any available address".
+		// In IPv6 mode, Linux treats that as meaning "announce on 0.0.0.0",
+		// which it refuses to do.  Rewrite to the IPv6 unspecified address.
+		if ip.Equal(net.IPv4zero) {
+			ip = net.IPv6zero
+		}
+		if ip = ip.To16(); ip == nil {
+			return nil, net.InvalidAddrError("non-IPv6 address")
+		}
+		sa := new(unix.SockaddrInet6)
+		for i := 0; i < net.IPv6len; i++ {
+			sa.Addr[i] = ip[i]
+		}
+		sa.Port = port
+		sa.ZoneId = uint32(zoneToInt(zone))
+		return sa, nil
+	}
+	return nil, net.InvalidAddrError("unexpected socket family")
+}
+
+func zoneToInt(zone string) int {
+	if zone == "" {
+		return 0
+	}
+	if ifi, err := net.InterfaceByName(zone); err == nil {
+		return ifi.Index
+	}
+	n, _, _ := dtoi(zone, 0)
+	return n
+}
+
+func dtoi(s string, i0 int) (n int, i int, ok bool) {
+	n = 0
+	for i = i0; i < len(s) && '0' <= s[i] && s[i] <= '9'; i++ {
+		n = n*10 + int(s[i]-'0')
+		if n >= big {
+			return 0, i, false
+		}
+	}
+	if i == i0 {
+		return 0, i, false
+	}
+	return n, i, true
+}
+
+// IPTcpAddrToUnixSocksAddr returns Sockaddr for specified TCP addr.
+func IPTcpAddrToUnixSocksAddr(addr string) (sa unix.Sockaddr, err error) {
+	if Debug {
+		fmt.Println("DEBUG: IPTcpAddrToUnixSocksAddr recieved address:", addr)
+	}
+	addressNet := "tcp6"
+	if addr[0] != '[' {
+		addressNet = "tcp4"
+	}
+	tcpAddr, err := net.ResolveTCPAddr(addressNet, addr)
+	if err != nil {
+		return nil, err
+	}
+	return ipToSocksAddr(ipType(addr), tcpAddr.IP, tcpAddr.Port, tcpAddr.Zone)
+}
+
+// IPv6UdpAddrToUnixSocksAddr returns Sockaddr for specified IPv6 addr.
+func IPv6UdpAddrToUnixSocksAddr(addr string) (sa unix.Sockaddr, err error) {
+	tcpAddr, err := net.ResolveTCPAddr("udp6", addr)
+	if err != nil {
+		return nil, err
+	}
+	return ipToSocksAddr(unix.AF_INET6, tcpAddr.IP, tcpAddr.Port, tcpAddr.Zone)
+}
+
+// TCPListen is listening for incoming IP packets which are being intercepted.
+// In conflict to regular Listen mehtod the socket destination and source addresses
+// are of the intercepted connection.
+// Else then that it works exactly like net package net.Listen.
+func TCPListen(listenAddr string) (listener net.Listener, err error) {
+	s, err := unix.Socket(unix.AF_INET6, unix.SOCK_STREAM, 0)
+	if err != nil {
+		return nil, err
+	}
+	defer unix.Close(s)
+	err = unix.SetsockoptInt(s, unix.SOL_IP, unix.IP_TRANSPARENT, 1)
+	if err != nil {
+		return nil, err
+	}
+
+	sa, err := IPTcpAddrToUnixSocksAddr(listenAddr)
+	if err != nil {
+		return nil, err
+	}
+	err = unix.Bind(s, sa)
+	if err != nil {
+		return nil, err
+	}
+	err = unix.Listen(s, unix.SOMAXCONN)
+	if err != nil {
+		return nil, err
+	}
+	f := os.NewFile(uintptr(s), "TProxy")
+	defer f.Close()
+	return net.FileListener(f)
+}
+func ipType(localAddr string) int {
+	host, _, _ := net.SplitHostPort(localAddr)
+	if host != "" {
+		ip := net.ParseIP(host)
+		if ip == nil || ip.To4() != nil {
+			return unix.AF_INET
+		}
+		return unix.AF_INET6
+	}
+	return unix.AF_INET
+}
+
+// TCPDial is a special tcp connection which binds a non local address as the source.
+// Except then the option to bind to a specific local address which the machine doesn't posses
+// it is exactly like any other net.Conn connection.
+// It is advised to use port numbered 0 in the localAddr and leave the kernel to choose which
+// Local port to use in order to avoid errors and binding conflicts.
+func TCPDial(localAddr, remoteAddr string, timeout time.Duration) (conn net.Conn, err error) {
+	timer := time.NewTimer(timeout)
+	defer timer.Stop()
+	if Debug {
+		fmt.Println("TCPDial from:", localAddr, "to:", remoteAddr)
+	}
+	s, err := unix.Socket(ipType(localAddr), unix.SOCK_STREAM, 0)
+
+	//In a case there was a need for a non-blocking socket an example
+	//s, err := unix.Socket(unix.AF_INET6, unix.SOCK_STREAM |unix.SOCK_NONBLOCK, 0)
+	if err != nil {
+		fmt.Println(err)
+		return nil, err
+	}
+	defer unix.Close(s)
+	err = unix.SetsockoptInt(s, unix.SOL_IP, unix.IP_TRANSPARENT, 1)
+	if err != nil {
+		if Debug {
+			fmt.Println("ERROR setting the socket in IP_TRANSPARENT mode", err)
+		}
+
+		return nil, err
+	}
+	err = unix.SetsockoptInt(s, unix.SOL_SOCKET, unix.SO_REUSEADDR, 1)
+	if err != nil {
+		if Debug {
+			fmt.Println("ERROR setting the socket in unix.SO_REUSEADDR mode", err)
+		}
+		return nil, err
+	}
+
+	rhost, _, err := net.SplitHostPort(localAddr)
+	if err != nil {
+		if Debug {
+			// fmt.Fprintln(os.Stderr, err)
+			fmt.Println("ERROR", err, "running net.SplitHostPort on address:", localAddr)
+		}
+	}
+
+	sa, err := IPTcpAddrToUnixSocksAddr(rhost + ":0")
+	if err != nil {
+		if Debug {
+			fmt.Println("ERROR creating a hostaddres for the socker with IPTcpAddrToUnixSocksAddr", err)
+		}
+		return nil, err
+	}
+
+	remoteSocket, err := IPTcpAddrToUnixSocksAddr(remoteAddr)
+	if err != nil {
+		if Debug {
+			fmt.Println("ERROR creating a remoteSocket for the socker with IPTcpAddrToUnixSocksAddr on the remote addres", err)
+		}
+		return nil, err
+	}
+
+	err = unix.Bind(s, sa)
+	if err != nil {
+		fmt.Println(err)
+		return nil, err
+	}
+
+	errChn := make(chan error, 1)
+	func() {
+		err = unix.Connect(s, remoteSocket)
+		if err != nil {
+			if Debug {
+				fmt.Println("ERROR Connecting from", s, "to:", remoteSocket, "ERROR:", err)
+			}
+		}
+		errChn <- err
+	}()
+
+	select {
+	case err = <-errChn:
+		if err != nil {
+			return nil, err
+		}
+	case <-timer.C:
+		return nil, fmt.Errorf("ERROR connect to %s timeout", remoteAddr)
+	}
+	f := os.NewFile(uintptr(s), "TProxyTCPClient")
+	client, err := net.FileConn(f)
+	if err != nil {
+		if Debug {
+			fmt.Println("ERROR os.NewFile", err)
+		}
+		return nil, err
+	}
+	if Debug {
+		fmt.Println("FINISHED Creating net.coo from:", client.LocalAddr().String(), "to:", client.RemoteAddr().String())
+	}
+	return client, err
+}
--- a/core/tproxy/tproxy_setup.sh
+++ b/core/tproxy/tproxy_setup.sh
@ -0,0 +1,30 @@
+#!/bin/bash
+SOURCE_BIND_IP="127.0.1.1"
+
+echo 0 > /proc/sys/net/ipv4/conf/lo/rp_filter
+echo 2 > /proc/sys/net/ipv4/conf/default/rp_filter
+echo 2 > /proc/sys/net/ipv4/conf/all/rp_filter
+echo 1 > /proc/sys/net/ipv4/conf/all/send_redirects
+echo 1 > /proc/sys/net/ipv4/conf/all/forwarding
+echo 1 > /proc/sys/net/ipv4/ip_forward
+
+# 本地的话,貌似这段不需要
+# iptables -t mangle -N DIVERT >/dev/null 2>&1
+# iptables -t mangle -F DIVERT
+# iptables -t mangle -D PREROUTING -p tcp -m socket -j DIVERT >/dev/null 2>&1
+# iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
+# iptables -t mangle -A DIVERT -j MARK --set-mark 1
+# iptables -t mangle -A DIVERT -j ACCEPT
+
+ip rule del fwmark 1 lookup 100
+ip rule add fwmark 1 lookup 100
+ip route del local 0.0.0.0/0 dev lo table 100
+ip route add local 0.0.0.0/0 dev lo table 100
+
+ip rule del from ${SOURCE_BIND_IP} table 101
+ip rule add from ${SOURCE_BIND_IP} table 101
+ip route del default via 127.0.0.1 dev lo table 101
+ip route add default via 127.0.0.1 dev lo table 101
+
+ip route flush cache
+ip ro flush cache
--- a/docs/old-release.md
+++ b/docs/old-release.md
@ -1,5 +1,7 @@
 # Old Versions of Proxy

+- [v5.3手册](https://github.com/snail007/goproxy/tree/v5.3) 
+- [v5.2手册](https://github.com/snail007/goproxy/tree/v5.2) 
 - [v5.1手册](https://github.com/snail007/goproxy/tree/v5.1) 
 - [v5.0手册](https://github.com/snail007/goproxy/tree/v5.0) 
 - [v4.9手册](https://github.com/snail007/goproxy/tree/v4.9) 
--- a/install_auto.sh
+++ b/install_auto.sh
@ -5,7 +5,7 @@ if [ -e /tmp/proxy ]; then
 fi
 mkdir /tmp/proxy
 cd /tmp/proxy
-wget https://github.com/snail007/goproxy/releases/download/v5.2/proxy-linux-amd64.tar.gz
+wget https://github.com/snail007/goproxy/releases/download/v6.1/proxy-linux-amd64.tar.gz

 # #install proxy
 tar zxvf proxy-linux-amd64.tar.gz
--- a/keygen.sh
+++ b/keygen.sh
@ -1,3 +0,0 @@
-#!/bin/bash
-openssl genrsa -out proxy.key 2048
-openssl req -new -key proxy.key -x509 -days 3650 -out proxy.crt -subj /C=CN/ST=BJ/O="Localhost Ltd"/CN=proxy
--- a/main.go
+++ b/main.go
@ -1,15 +1,17 @@
 package main

 import (
+	"fmt"
 	"log"
 	"os"
 	"os/signal"
+	"runtime/debug"
 	"syscall"

 	"github.com/snail007/goproxy/services"
 )

-const APP_VERSION = "5.2"
+var APP_VERSION = "No Version Provided"

 func main() {
 	err := initConfig()
@ -32,6 +34,11 @@ func Clean(s *services.Service) {
 		syscall.SIGTERM,
 		syscall.SIGQUIT)
 	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
 		for _ = range signalChan {
 			log.Println("Received an interrupt, stopping services...")
 			if s != nil && *s != nil {
--- a/release.sh
+++ b/release.sh
@ -1,74 +1,87 @@
 #!/bin/bash
-VER="5.2"
-RELEASE="release-${VER}"
+VERSION=$(cat VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X main.APP_VERSION=$VER"
+RELEASE="release-${VERSION}"
+TRIMPATH1="/Users/snail/go/src/github.com/snail007"
+TRIMPATH=$(dirname ~/go/src/github.com/snail007)/snail007
+if [ -d "$TRIMPATH1" ];then
+	TRIMPATH=$TRIMPATH1
+fi
+OPTS="-gcflags=-trimpath=$TRIMPATH -asmflags=-trimpath=$TRIMPATH"
+
 rm -rf .cert
 mkdir .cert
-go build -o proxy 
+go build $OPTS -ldflags "$X" -o proxy 
 cd .cert
 ../proxy keygen -C proxy
 cd ..
 rm -rf ${RELEASE}
 mkdir ${RELEASE}
 #linux
-CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-386.tar.gz" proxy direct blocked
-CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=6 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v6.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=6 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v6.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v7.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=7 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v7.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=5 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v5.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=5 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v5.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=mips go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64le.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-mipsle.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=ppc64 go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-ppc64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=ppc64le go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-ppc64le.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=linux GOARCH=s390x go build -o proxy && tar zcfv "${RELEASE}/proxy-linux-s390x.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-386.tar.gz" proxy direct blocked
+CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=6 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v6.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=6 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v6.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=7 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v7.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=7 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v7.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=5 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v5.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GOARM=5 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v5.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm64-v8.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-arm-v8.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips64le go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64le.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mipsle.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips-softfloat.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips64 GOMIPS=softfloat go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64-softfloat.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mips64le GOMIPS=softfloat go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mips64le-softfloat.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-mipsle-softfloat.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=ppc64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-ppc64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=ppc64le go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-ppc64le.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=linux GOARCH=s390x go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-linux-s390x.tar.gz" proxy direct blocked 
 #android
-CGO_ENABLED=0 GOOS=android GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-android-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=android GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-android-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=android GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-android-arm.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=android GOARCH=arm64 go build -o proxy && tar zcfv "${RELEASE}/proxy-android-arm64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=android GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-android-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=android GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-android-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=android GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-android-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=android GOARCH=arm64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-android-arm64.tar.gz" proxy direct blocked 
 #darwin
-CGO_ENABLED=0 GOOS=darwin GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-darwin-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-darwin-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=darwin GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-darwin-arm.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build -o proxy && tar zcfv "${RELEASE}/proxy-darwin-arm64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=darwin GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-darwin-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-darwin-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=darwin GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-darwin-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=darwin GOARCH=arm64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-darwin-arm64.tar.gz" proxy direct blocked 
 #dragonfly
-CGO_ENABLED=0 GOOS=dragonfly GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-dragonfly-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=dragonfly GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-dragonfly-amd64.tar.gz" proxy direct blocked 
 #freebsd
-CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=freebsd GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=freebsd GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=freebsd GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=freebsd GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-freebsd-arm.tar.gz" proxy direct blocked 
 #nacl
-CGO_ENABLED=0 GOOS=nacl GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-nacl-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=nacl GOARCH=amd64p32 go build -o proxy && tar zcfv "${RELEASE}/proxy-nacl-amd64p32.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=nacl GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-nacl-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=nacl GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-nacl-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=nacl GOARCH=amd64p32 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-nacl-amd64p32.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=nacl GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-nacl-arm.tar.gz" proxy direct blocked 
 #netbsd
-CGO_ENABLED=0 GOOS=netbsd GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=netbsd GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=netbsd GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=netbsd GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=netbsd GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=netbsd GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-netbsd-arm.tar.gz" proxy direct blocked 
 #openbsd
-CGO_ENABLED=0 GOOS=openbsd GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=openbsd GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=openbsd GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=openbsd GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=openbsd GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=openbsd GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-openbsd-arm.tar.gz" proxy direct blocked 
 #plan9
-CGO_ENABLED=0 GOOS=plan9 GOARCH=386 go build -o proxy && tar zcfv "${RELEASE}/proxy-plan9-386.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=plan9 GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-plan9-amd64.tar.gz" proxy direct blocked 
-CGO_ENABLED=0 GOOS=plan9 GOARCH=arm go build -o proxy && tar zcfv "${RELEASE}/proxy-plan9-arm.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=plan9 GOARCH=386 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-plan9-386.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=plan9 GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-plan9-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=plan9 GOARCH=arm go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-plan9-arm.tar.gz" proxy direct blocked 
 #solaris
-CGO_ENABLED=0 GOOS=solaris GOARCH=amd64 go build -o proxy && tar zcfv "${RELEASE}/proxy-solaris-amd64.tar.gz" proxy direct blocked 
+CGO_ENABLED=0 GOOS=solaris GOARCH=amd64 go build $OPTS -ldflags "$X" -o proxy && tar zcfv "${RELEASE}/proxy-solaris-amd64.tar.gz" proxy direct blocked 
 #windows
-CGO_ENABLED=0 GOOS=windows GOARCH=386 go build  -ldflags="-H=windowsgui" -o proxy-wingui.exe
-CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -o proxy.exe && tar zcfv "${RELEASE}/proxy-windows-386.tar.gz" proxy.exe proxy-wingui.exe direct blocked .cert/proxy.crt .cert/proxy.key
-CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -ldflags="-H=windowsgui" -o proxy-wingui.exe
-CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -o proxy.exe && tar zcfv "${RELEASE}/proxy-windows-amd64.tar.gz" proxy.exe proxy-wingui.exe direct blocked .cert/proxy.crt .cert/proxy.key
+CGO_ENABLED=0 GOOS=windows GOARCH=386 go build $OPTS -ldflags="-H=windowsgui $X" -o proxy-noconsole.exe
+CGO_ENABLED=0 GOOS=windows GOARCH=386 go build $OPTS  -ldflags "$X" -o proxy.exe && tar zcfv "${RELEASE}/proxy-windows-386.tar.gz" proxy.exe proxy-noconsole.exe direct blocked .cert/proxy.crt .cert/proxy.key
+CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build $OPTS -ldflags="-H=windowsgui $X" -o proxy-noconsole.exe
+CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build $OPTS  -ldflags "$X" -o proxy.exe && tar zcfv "${RELEASE}/proxy-windows-amd64.tar.gz" proxy.exe proxy-noconsole.exe direct blocked .cert/proxy.crt .cert/proxy.key

-rm -rf proxy proxy.exe proxy-wingui.exe .cert
+rm -rf proxy proxy.exe proxy-noconsole.exe .cert

 #todo
-#1.release.sh        VER="xxx"
-#2.main.go           APP_VERSION="xxx"
-#3.install_auto.sh   goproxy/releases/download/vxxx
-#4.README            goproxy/releases/download/vxxx
+#1.install_auto.sh   goproxy/releases/download/vxxx
+#2.README        goproxy/releases/download/vxxx
--- a/sdk/CHANGELOG
+++ b/sdk/CHANGELOG
@ -1,10 +1,3 @@
-SDK更新日志
-
-v4.9
-1.修复了HTTP Basic代理返回不合适的头部,导致浏览器不会弹框,个别代理插件无法认证的问题.
-2.内网穿透切换smux到yamux.
-3.优化了HTTP(S)\SOCKS5代理--always的处理逻辑.
-
 v4.8
 1.修复了多个服务同时开启日志,只会输出到最后一个日志文件的bug.  
 2.增加了获取sdk版本的Version()方法.  
--- a/sdk/README.md
+++ b/sdk/README.md
@ -200,7 +200,7 @@ int main() {
 ```

 #### 编译test-proxy.c ####  
-`export LD_LIBRARY_PATH=./ && gcc -o test-proxy test.c libproxy-sdk.so`  
+`export LD_LIBRARY_PATH=./ && gcc -o test-proxy test-proxy.c libproxy-sdk.so`  

 #### 执行 ####  
 `./test-proxy`  
--- a/sdk/android-ios/dns.go
+++ b/sdk/android-ios/dns.go
@ -13,8 +13,8 @@ import (

 	"github.com/miekg/dns"
 	gocache "github.com/pmylund/go-cache"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	services "github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 )

 type DNSArgs struct {
@ -58,6 +58,11 @@ func (s *DNS) InitService() (err error) {
 	s.cache = gocache.New(time.Second*time.Duration(*s.cfg.DNSTTL), time.Second*60)
 	s.cache.LoadFile(*s.cfg.CacheFile)
 	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
 		for {
 			select {
 			case <-s.exitSig:
@ -76,7 +81,7 @@ func (s *DNS) InitService() (err error) {
 		nil,
 		&net.Dialer{
 			Timeout:   5 * time.Second,
-			KeepAlive: 2 * time.Second,
+			KeepAlive: 5 * time.Second,
 		},
 	)
 	if err != nil {
@ -135,6 +140,11 @@ func (s *DNS) Start(args interface{}, log *logger.Logger) (err error) {
 	}
 	dns.HandleFunc(".", s.callback)
 	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
 		log.Printf("dns server on udp %s", *s.cfg.Local)
 		err := dns.ListenAndServe(*s.cfg.Local, "udp", nil)
 		if err != nil {
--- a/sdk/android-ios/release_android.sh
+++ b/sdk/android-ios/release_android.sh
@ -1,5 +1,8 @@
 #/bin/bash
-VER="v5.0"
+VERSION=$(cat ../../VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X github.com/snail007/goproxy/sdk/android-ios.SDK_VERSION=$VER -X main.APP_VERSION=$VER"
+
 rm -rf sdk-android-*.tar.gz
 rm -rf android
 mkdir android
@ -14,11 +17,11 @@ mkdir android
 #go get -v golang.org/x/mobile/cmd/gomobile
 #gomobile init

-gomobile bind -v -target=android -javapkg=snail007 -ldflags="-s -w"
+gomobile bind -v -target=android -javapkg=snail007 -ldflags="-s -w $X"
 mv proxy.aar android/snail007.goproxy.sdk.aar
 mv proxy-sources.jar android/snail007.goproxy.sdk-sources.jar
 cp ../README.md android
-tar zcfv sdk-android-${VER}.tar.gz android
+tar zcfv sdk-android-${VERSION}.tar.gz android
 rm -rf android

 echo "done."
--- a/sdk/android-ios/release_ios.sh
+++ b/sdk/android-ios/release_ios.sh
@ -1,14 +1,17 @@
 #/bin/bash
-VER="v5.0"
+VERSION=$(cat ../../VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X github.com/snail007/goproxy/sdk/android-ios.SDK_VERSION=$VER -X main.APP_VERSION=$VER"
+
 rm -rf sdk-ios-*.tar.gz
 rm -rf ios
 mkdir ios

 #ios  XCode required
-gomobile bind -v -target=ios -ldflags="-s -w"
+gomobile bind -v -target=ios -ldflags="-s -w $X"
 mv Proxy.framework ios
 cp ../README.md ios
-tar zcfv sdk-ios-${VER}.tar.gz ios
+tar zcfv sdk-ios-${VERSION}.tar.gz ios
 rm -rf ios

 echo "done."
--- a/sdk/android-ios/sdk.go
+++ b/sdk/android-ios/sdk.go
@ -3,32 +3,55 @@ package proxy
 import (
 	"crypto/sha1"
 	"fmt"
+	"io/ioutil"
 	logger "log"
 	"os"
 	"path"
 	"path/filepath"
 	"strings"

+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
 	"github.com/snail007/goproxy/services"
 	httpx "github.com/snail007/goproxy/services/http"
-	"github.com/snail007/goproxy/services/kcpcfg"
+	keygenx "github.com/snail007/goproxy/services/keygen"
 	mux "github.com/snail007/goproxy/services/mux"
 	socksx "github.com/snail007/goproxy/services/socks"
 	spsx "github.com/snail007/goproxy/services/sps"
 	tcpx "github.com/snail007/goproxy/services/tcp"
-	tunnel "github.com/snail007/goproxy/services/tunnel"
+	tunnelx "github.com/snail007/goproxy/services/tunnel"
 	udpx "github.com/snail007/goproxy/services/udp"
+
 	kcp "github.com/xtaci/kcp-go"
 	"golang.org/x/crypto/pbkdf2"
 	kingpin "gopkg.in/alecthomas/kingpin.v2"
 )

-const SDK_VERSION = "5.0"
+var SDK_VERSION = "No Version Provided"

 var (
 	app *kingpin.Application
 )

+type LogCallback interface {
+	Write(line string)
+}
+type logCallback interface {
+	Write(line string)
+}
+type logWriter struct {
+	callback LogCallback
+}
+
+func (s *logWriter) Write(p []byte) (n int, err error) {
+	s.callback.Write(string(p))
+	return
+}
+
+func Start(serviceID, serviceArgsStr string) (errStr string) {
+	return StartWithLog(serviceID, serviceArgsStr, nil)
+}
+
 //Start
 //serviceID : is service identify id,different service's id should be difference
 //serviceArgsStr: is the whole command line args string
@ -38,13 +61,13 @@ var (
 //and so on.
 //if an error occured , errStr will be the error reason
 //if start success, errStr is empty.
-func Start(serviceID, serviceArgsStr string) (errStr string) {
+func StartWithLog(serviceID, serviceArgsStr string, loggerCallback LogCallback) (errStr string) {
 	//define  args
 	tcpArgs := tcpx.TCPArgs{}
 	httpArgs := httpx.HTTPArgs{}
-	tunnelServerArgs := tunnel.TunnelServerArgs{}
-	tunnelClientArgs := tunnel.TunnelClientArgs{}
-	tunnelBridgeArgs := tunnel.TunnelBridgeArgs{}
+	tunnelServerArgs := tunnelx.TunnelServerArgs{}
+	tunnelClientArgs := tunnelx.TunnelClientArgs{}
+	tunnelBridgeArgs := tunnelx.TunnelBridgeArgs{}
 	muxServerArgs := mux.MuxServerArgs{}
 	muxClientArgs := mux.MuxClientArgs{}
 	muxBridgeArgs := mux.MuxBridgeArgs{}
@ -52,16 +75,18 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	socksArgs := socksx.SocksArgs{}
 	spsArgs := spsx.SPSArgs{}
 	dnsArgs := DNSArgs{}
+	keygenArgs := keygenx.KeygenArgs{}
 	kcpArgs := kcpcfg.KCPConfigArgs{}
 	//build srvice args
 	app = kingpin.New("proxy", "happy with proxy")
 	app.Author("snail").Version(SDK_VERSION)
 	debug := app.Flag("debug", "debug log output").Default("false").Bool()
 	logfile := app.Flag("log", "log file path").Default("").String()
+	nolog := app.Flag("nolog", "turn off logging").Default("false").Bool()
 	kcpArgs.Key = app.Flag("kcp-key", "pre-shared secret between client and server").Default("secrect").String()
 	kcpArgs.Crypt = app.Flag("kcp-method", "encrypt/decrypt method, can be: aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none").Default("aes").Enum("aes", "aes-128", "aes-192", "salsa20", "blowfish", "twofish", "cast5", "3des", "tea", "xtea", "xor", "sm4", "none")
-	kcpArgs.Mode = app.Flag("kcp-mode", "profiles: fast3, fast2, fast, normal, manual").Default("fast3").Enum("fast3", "fast2", "fast", "normal", "manual")
-	kcpArgs.MTU = app.Flag("kcp-mtu", "set maximum transmission unit for UDP packets").Default("1350").Int()
+	kcpArgs.Mode = app.Flag("kcp-mode", "profiles: fast3, fast2, fast, normal, manual").Default("fast").Enum("fast3", "fast2", "fast", "normal", "manual")
+	kcpArgs.MTU = app.Flag("kcp-mtu", "set maximum transmission unit for UDP packets").Default("450").Int()
 	kcpArgs.SndWnd = app.Flag("kcp-sndwnd", "set send window size(num of packets)").Default("1024").Int()
 	kcpArgs.RcvWnd = app.Flag("kcp-rcvwnd", "set receive window size(num of packets)").Default("1024").Int()
 	kcpArgs.DataShard = app.Flag("kcp-ds", "set reed-solomon erasure coding - datashard").Default("10").Int()
@ -78,7 +103,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {

 	//########http#########
 	http := app.Command("http", "proxy on http mode")
-	httpArgs.Parent = http.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
+	httpArgs.Parent = http.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').Strings()
 	httpArgs.CaCertFile = http.Flag("ca", "ca cert file for tls").Default("").String()
 	httpArgs.CertFile = http.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	httpArgs.KeyFile = http.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
@ -109,7 +134,14 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	httpArgs.ParentKey = http.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	httpArgs.LocalCompress = http.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	httpArgs.ParentCompress = http.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
-
+	httpArgs.LoadBalanceMethod = http.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	httpArgs.LoadBalanceTimeout = http.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	httpArgs.LoadBalanceRetryTime = http.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	httpArgs.LoadBalanceHashTarget = http.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	httpArgs.LoadBalanceOnlyHA = http.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	httpArgs.RateLimit = http.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	httpArgs.BindListen = http.Flag("bind-listen", "using listener binding IP when connect to target").Short('B').Default("false").Bool()
+	httpArgs.Debug = debug
 	//########tcp#########
 	tcp := app.Command("tcp", "proxy on tcp mode")
 	tcpArgs.Parent = tcp.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
@ -120,6 +152,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	tcpArgs.LocalType = tcp.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	tcpArgs.CheckParentInterval = tcp.Flag("check-parent-interval", "check if proxy is okay every interval seconds,zero: means no check").Short('I').Default("3").Int()
 	tcpArgs.Local = tcp.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
+	tcpArgs.Jumper = tcp.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########udp#########
 	udp := app.Command("udp", "proxy on udp mode")
@ -134,7 +167,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	//########mux-server#########
 	muxServer := app.Command("server", "proxy on mux server mode")
 	muxServerArgs.Parent = muxServer.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
-	muxServerArgs.ParentType = muxServer.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Default("tls").Short('T').Enum("tls", "tcp", "kcp")
+	muxServerArgs.ParentType = muxServer.Flag("parent-type", "parent protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('T').Enum("tls", "tcp", "tcps", "kcp", "tou")
 	muxServerArgs.CertFile = muxServer.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	muxServerArgs.KeyFile = muxServer.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxServerArgs.Timeout = muxServer.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
@ -143,17 +176,27 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	muxServerArgs.Route = muxServer.Flag("route", "local route to client's network, such as: PROTOCOL://LOCAL_IP:LOCAL_PORT@[CLIENT_KEY]CLIENT_LOCAL_HOST:CLIENT_LOCAL_PORT").Short('r').Default("").Strings()
 	muxServerArgs.IsCompress = muxServer.Flag("c", "compress data when tcp|tls mode").Default("false").Bool()
 	muxServerArgs.SessionCount = muxServer.Flag("session-count", "session count which connect to bridge").Short('n').Default("10").Int()
+	muxServerArgs.Jumper = muxServer.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()
+	muxServerArgs.TCPSMethod = muxServer.Flag("tcps-method", "method of parent tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxServerArgs.TCPSPassword = muxServer.Flag("tcps-password", "password of parent tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxServerArgs.TOUMethod = muxServer.Flag("tou-method", "method of parent tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxServerArgs.TOUPassword = muxServer.Flag("tou-password", "password of parent tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########mux-client#########
 	muxClient := app.Command("client", "proxy on mux client mode")
 	muxClientArgs.Parent = muxClient.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
-	muxClientArgs.ParentType = muxClient.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Default("tls").Short('T').Enum("tls", "tcp", "kcp")
+	muxClientArgs.ParentType = muxClient.Flag("parent-type", "parent protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('T').Enum("tls", "tcp", "tcps", "kcp", "tou")
 	muxClientArgs.CertFile = muxClient.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	muxClientArgs.KeyFile = muxClient.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxClientArgs.Timeout = muxClient.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
 	muxClientArgs.Key = muxClient.Flag("k", "key same with server").Default("default").String()
 	muxClientArgs.IsCompress = muxClient.Flag("c", "compress data when tcp|tls mode").Default("false").Bool()
 	muxClientArgs.SessionCount = muxClient.Flag("session-count", "session count which connect to bridge").Short('n').Default("10").Int()
+	muxClientArgs.Jumper = muxClient.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()
+	muxClientArgs.TCPSMethod = muxClient.Flag("tcps-method", "method of parent tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxClientArgs.TCPSPassword = muxClient.Flag("tcps-password", "password of parent tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxClientArgs.TOUMethod = muxClient.Flag("tou-method", "method of parent tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxClientArgs.TOUPassword = muxClient.Flag("tou-password", "password of parent tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########mux-bridge#########
 	muxBridge := app.Command("bridge", "proxy on mux bridge mode")
@ -161,7 +204,11 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	muxBridgeArgs.KeyFile = muxBridge.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	muxBridgeArgs.Timeout = muxBridge.Flag("timeout", "tcp timeout with milliseconds").Short('i').Default("2000").Int()
 	muxBridgeArgs.Local = muxBridge.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
-	muxBridgeArgs.LocalType = muxBridge.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tls").Short('t').Enum("tls", "tcp", "kcp")
+	muxBridgeArgs.LocalType = muxBridge.Flag("local-type", "local protocol type <tls|tcp|tcps|kcp|tou>").Default("tls").Short('t').Enum("tls", "tcp", "tcps", "kcp", "tou")
+	muxBridgeArgs.TCPSMethod = muxBridge.Flag("tcps-method", "method of local tcps's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxBridgeArgs.TCPSPassword = muxBridge.Flag("tcps-password", "password of local tcps's encrpyt/decrypt").Default("snail007's_goproxy").String()
+	muxBridgeArgs.TOUMethod = muxBridge.Flag("tou-method", "method of local tou's encrpyt/decrypt, these below are supported :\n"+strings.Join(encryptconn.GetCipherMethods(), ",")).Default("aes-192-cfb").String()
+	muxBridgeArgs.TOUPassword = muxBridge.Flag("tou-password", "password of local tou's encrpyt/decrypt").Default("snail007's_goproxy").String()

 	//########tunnel-server#########
 	tunnelServer := app.Command("tserver", "proxy on tunnel server mode")
@ -172,6 +219,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	tunnelServerArgs.IsUDP = tunnelServer.Flag("udp", "proxy on udp tunnel server mode").Default("false").Bool()
 	tunnelServerArgs.Key = tunnelServer.Flag("k", "client key").Default("default").String()
 	tunnelServerArgs.Route = tunnelServer.Flag("route", "local route to client's network, such as: PROTOCOL://LOCAL_IP:LOCAL_PORT@[CLIENT_KEY]CLIENT_LOCAL_HOST:CLIENT_LOCAL_PORT").Short('r').Default("").Strings()
+	tunnelServerArgs.Jumper = tunnelServer.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########tunnel-client#########
 	tunnelClient := app.Command("tclient", "proxy on tunnel client mode")
@ -180,6 +228,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	tunnelClientArgs.KeyFile = tunnelClient.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	tunnelClientArgs.Timeout = tunnelClient.Flag("timeout", "tcp timeout with milliseconds").Short('t').Default("2000").Int()
 	tunnelClientArgs.Key = tunnelClient.Flag("k", "key same with server").Default("default").String()
+	tunnelClientArgs.Jumper = tunnelClient.Flag("jumper", "https or socks5 proxies used when connecting to parent, only worked of -T is tls or tcp, format is https://username:password@host:port https://host:port or socks5://username:password@host:port socks5://host:port").Short('J').Default("").String()

 	//########tunnel-bridge#########
 	tunnelBridge := app.Command("tbridge", "proxy on tunnel bridge mode")
@ -190,7 +239,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {

 	//########ssh#########
 	socks := app.Command("socks", "proxy on ssh mode")
-	socksArgs.Parent = socks.Flag("parent", "parent ssh address, such as: \"23.32.32.19:22\"").Default("").Short('P').String()
+	socksArgs.Parent = socks.Flag("parent", "parent ssh address, such as: \"23.32.32.19:22\"").Default("").Short('P').Strings()
 	socksArgs.ParentType = socks.Flag("parent-type", "parent protocol type <tls|tcp|kcp|ssh>").Default("tcp").Short('T').Enum("tls", "tcp", "kcp", "ssh")
 	socksArgs.LocalType = socks.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	socksArgs.Local = socks.Flag("local", "local ip:port to listen").Short('p').Default(":33080").String()
@ -200,7 +249,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	socksArgs.SSHUser = socks.Flag("ssh-user", "user for ssh").Short('u').Default("").String()
 	socksArgs.SSHKeyFile = socks.Flag("ssh-key", "private key file for ssh").Short('S').Default("").String()
 	socksArgs.SSHKeyFileSalt = socks.Flag("ssh-keysalt", "salt of ssh private key").Short('s').Default("").String()
-	socksArgs.SSHPassword = socks.Flag("ssh-password", "password for ssh").Short('A').Default("").String()
+	socksArgs.SSHPassword = socks.Flag("ssh-password", "password for ssh").Short('D').Default("").String()
 	socksArgs.Always = socks.Flag("always", "always use parent proxy").Default("false").Bool()
 	socksArgs.Timeout = socks.Flag("timeout", "tcp timeout milliseconds when connect to real server or parent proxy").Default("5000").Int()
 	socksArgs.Interval = socks.Flag("interval", "check domain if blocked every interval seconds").Default("10").Int()
@ -213,16 +262,25 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	socksArgs.AuthURLTimeout = socks.Flag("auth-timeout", "access 'auth-url' timeout milliseconds").Default("3000").Int()
 	socksArgs.AuthURLOkCode = socks.Flag("auth-code", "access 'auth-url' success http code").Default("204").Int()
 	socksArgs.AuthURLRetry = socks.Flag("auth-retry", "access 'auth-url' fail and retry count").Default("0").Int()
+	socksArgs.ParentAuth = socks.Flag("parent-auth", "parent socks auth username and password, such as: -A user1:pass1").Short('A').String()
 	socksArgs.DNSAddress = socks.Flag("dns-address", "if set this, proxy will use this dns for resolve doamin").Short('q').Default("").String()
 	socksArgs.DNSTTL = socks.Flag("dns-ttl", "caching seconds of dns query result").Short('e').Default("300").Int()
 	socksArgs.LocalKey = socks.Flag("local-key", "the password for auto encrypt/decrypt local connection data").Short('z').Default("").String()
 	socksArgs.ParentKey = socks.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	socksArgs.LocalCompress = socks.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	socksArgs.ParentCompress = socks.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
+	socksArgs.LoadBalanceMethod = socks.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	socksArgs.LoadBalanceTimeout = socks.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	socksArgs.LoadBalanceRetryTime = socks.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	socksArgs.LoadBalanceHashTarget = socks.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	socksArgs.LoadBalanceOnlyHA = socks.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	socksArgs.RateLimit = socks.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	socksArgs.BindListen = socks.Flag("bind-listen", "using listener binding IP when connect to target").Short('B').Default("false").Bool()
+	socksArgs.Debug = debug

 	//########socks+http(s)#########
 	sps := app.Command("sps", "proxy on socks+http(s) mode")
-	spsArgs.Parent = sps.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
+	spsArgs.Parent = sps.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').Strings()
 	spsArgs.CertFile = sps.Flag("cert", "cert file for tls").Short('C').Default("proxy.crt").String()
 	spsArgs.KeyFile = sps.Flag("key", "key file for tls").Short('K').Default("proxy.key").String()
 	spsArgs.CaCertFile = sps.Flag("ca", "ca cert file for tls").Default("").String()
@ -230,12 +288,12 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	spsArgs.ParentType = sps.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Short('T').Enum("tls", "tcp", "kcp")
 	spsArgs.LocalType = sps.Flag("local-type", "local protocol type <tls|tcp|kcp>").Default("tcp").Short('t').Enum("tls", "tcp", "kcp")
 	spsArgs.Local = sps.Flag("local", "local ip:port to listen,multiple address use comma split,such as: 0.0.0.0:80,0.0.0.0:443").Short('p').Default(":33080").String()
-	spsArgs.ParentServiceType = sps.Flag("parent-service-type", "parent service type <http|socks>").Short('S').Enum("http", "socks")
+	spsArgs.ParentServiceType = sps.Flag("parent-service-type", "parent service type <http|socks|ss>").Short('S').Enum("http", "socks", "ss")
 	spsArgs.DNSAddress = sps.Flag("dns-address", "if set this, proxy will use this dns for resolve doamin").Short('q').Default("").String()
 	spsArgs.DNSTTL = sps.Flag("dns-ttl", "caching seconds of dns query result").Short('e').Default("300").Int()
 	spsArgs.AuthFile = sps.Flag("auth-file", "http basic auth file,\"username:password\" each line in file").Short('F').String()
 	spsArgs.Auth = sps.Flag("auth", "socks auth username and password, mutiple user repeat -a ,such as: -a user1:pass1 -a user2:pass2").Short('a').Strings()
-	spsArgs.LocalIPS = sps.Flag("local bind ips", "if your host behind a nat,set your public ip here avoid dead loop").Short('g').Strings()
+	spsArgs.LocalIPS = sps.Flag("local-bind-ips", "if your host behind a nat,set your public ip here avoid dead loop").Short('g').Strings()
 	spsArgs.AuthURL = sps.Flag("auth-url", "auth username and password will send to this url,response http code equal to 'auth-code' means ok,others means fail.").Default("").String()
 	spsArgs.AuthURLTimeout = sps.Flag("auth-timeout", "access 'auth-url' timeout milliseconds").Default("3000").Int()
 	spsArgs.AuthURLOkCode = sps.Flag("auth-code", "access 'auth-url' success http code").Default("204").Int()
@ -245,8 +303,21 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	spsArgs.ParentKey = sps.Flag("parent-key", "the password for auto encrypt/decrypt parent connection data").Short('Z').Default("").String()
 	spsArgs.LocalCompress = sps.Flag("local-compress", "auto compress/decompress data on local connection").Short('m').Default("false").Bool()
 	spsArgs.ParentCompress = sps.Flag("parent-compress", "auto compress/decompress data on parent connection").Short('M').Default("false").Bool()
+	spsArgs.SSMethod = sps.Flag("ss-method", "the following methods are supported: aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb, cast5-cfb, des-cfb, rc4-md5, rc4-md5-6, chacha20, salsa20, rc4, table, des-cfb, chacha20-ietf; if you use ss client , \"-t tcp\" is required").Short('h').Default("aes-256-cfb").String()
+	spsArgs.SSKey = sps.Flag("ss-key", "if you use ss client , \"-t tcp\" is required").Short('j').Default("sspassword").String()
+	spsArgs.ParentSSMethod = sps.Flag("parent-ss-method", "the following methods are supported: aes-128-cfb, aes-192-cfb, aes-256-cfb, bf-cfb, cast5-cfb, des-cfb, rc4-md5, rc4-md5-6, chacha20, salsa20, rc4, table, des-cfb, chacha20-ietf; if you use ss server as parent, \"-T tcp\" is required").Short('H').Default("aes-256-cfb").String()
+	spsArgs.ParentSSKey = sps.Flag("parent-ss-key", "if you use ss server as parent, \"-T tcp\" is required").Short('J').Default("sspassword").String()
 	spsArgs.DisableHTTP = sps.Flag("disable-http", "disable http(s) proxy").Default("false").Bool()
 	spsArgs.DisableSocks5 = sps.Flag("disable-socks", "disable socks proxy").Default("false").Bool()
+	spsArgs.DisableSS = sps.Flag("disable-ss", "disable ss proxy").Default("false").Bool()
+	spsArgs.LoadBalanceMethod = sps.Flag("lb-method", "load balance method when use multiple parent,can be <roundrobin|leastconn|leasttime|hash|weight>").Default("hash").Enum("roundrobin", "weight", "leastconn", "leasttime", "hash")
+	spsArgs.LoadBalanceTimeout = sps.Flag("lb-timeout", "tcp milliseconds timeout of connecting to parent").Default("500").Int()
+	spsArgs.LoadBalanceRetryTime = sps.Flag("lb-retrytime", "sleep time milliseconds after checking").Default("1000").Int()
+	spsArgs.LoadBalanceHashTarget = sps.Flag("lb-hashtarget", "use target address to choose parent for LB").Default("false").Bool()
+	spsArgs.LoadBalanceOnlyHA = sps.Flag("lb-onlyha", "use only `high availability mode` to choose parent for LB").Default("false").Bool()
+	spsArgs.RateLimit = sps.Flag("rate-limit", "rate limit (bytes/second) of each connection, such as: 100K 1.5M . 0 means no limitation").Short('l').Default("0").String()
+	spsArgs.Debug = debug
+
 	//########dns#########
 	dns := app.Command("dns", "proxy on dns server mode")
 	dnsArgs.Parent = dns.Flag("parent", "parent address, such as: \"23.32.32.19:28008\"").Default("").Short('P').String()
@ -255,7 +326,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	dnsArgs.CaCertFile = dns.Flag("ca", "ca cert file for tls").Default("").String()
 	dnsArgs.Timeout = dns.Flag("timeout", "tcp timeout milliseconds when connect to real server or parent proxy").Short('i').Default("2000").Int()
 	dnsArgs.ParentType = dns.Flag("parent-type", "parent protocol type <tls|tcp|kcp>").Short('T').Enum("tls", "tcp", "kcp")
-	dnsArgs.Local = dns.Flag("local", "local ip:port to listen,multiple address use comma split,such as: 0.0.0.0:80,0.0.0.0:443").Short('p').Default(":33080").String()
+	dnsArgs.Local = dns.Flag("local", "local ip:port to listen,multiple address use comma split,such as: 0.0.0.0:80,0.0.0.0:443").Short('p').Default(":53").String()
 	dnsArgs.ParentServiceType = dns.Flag("parent-service-type", "parent service type <http|socks>").Short('S').Enum("http", "socks")
 	dnsArgs.RemoteDNSAddress = dns.Flag("dns-address", "remote dns for resolve doamin").Short('q').Default("8.8.8.8:53").String()
 	dnsArgs.DNSTTL = dns.Flag("dns-ttl", "caching seconds of dns query result").Short('e').Default("300").Int()
@ -265,6 +336,14 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	dnsArgs.CacheFile = dns.Flag("cache-file", "dns result cached file").Short('f').Default(filepath.Join(path.Dir(os.Args[0]), "cache.dat")).String()
 	dnsArgs.LocalSocks5Port = dns.Flag("socks-port", "local socks5 port").Short('s').Default("65501").String()

+	//########keygen#########
+	keygen := app.Command("keygen", "create certificate for proxy")
+	keygenArgs.CommonName = keygen.Flag("cn", "common name").Short('n').Default("").String()
+	keygenArgs.CaName = keygen.Flag("ca", "ca name").Short('C').Default("").String()
+	keygenArgs.CertName = keygen.Flag("cert", "cert name of sign to create").Short('c').Default("").String()
+	keygenArgs.SignDays = keygen.Flag("days", "days of sign").Short('d').Default("365").Int()
+	keygenArgs.Sign = keygen.Flag("sign", "cert is to signin").Short('s').Default("false").Bool()
+
 	//parse args
 	_args := strings.Fields(strings.Trim(serviceArgsStr, " "))
 	args := []string{}
@ -337,12 +416,20 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	}
 	log.SetFlags(flags)

-	if *logfile != "" {
-		f, e := os.OpenFile(*logfile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
-		if e != nil {
-			log.Fatal(e)
+	if loggerCallback == nil {
+		if *nolog {
+			log.SetOutput(ioutil.Discard)
+		} else if *logfile != "" {
+			f, e := os.OpenFile(*logfile, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
+			if e != nil {
+				log.Fatal(e)
+			}
+			log.SetOutput(f)
 		}
-		log.SetOutput(f)
+	} else {
+		log.SetOutput(&logWriter{
+			callback: loggerCallback,
+		})
 	}

 	//regist services and run service
@ -354,11 +441,11 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	case "udp":
 		services.Regist(serviceID, udpx.NewUDP(), udpArgs, log)
 	case "tserver":
-		services.Regist(serviceID, tunnel.NewTunnelServerManager(), tunnelServerArgs, log)
+		services.Regist(serviceID, tunnelx.NewTunnelServerManager(), tunnelServerArgs, log)
 	case "tclient":
-		services.Regist(serviceID, tunnel.NewTunnelClient(), tunnelClientArgs, log)
+		services.Regist(serviceID, tunnelx.NewTunnelClient(), tunnelClientArgs, log)
 	case "tbridge":
-		services.Regist(serviceID, tunnel.NewTunnelBridge(), tunnelBridgeArgs, log)
+		services.Regist(serviceID, tunnelx.NewTunnelBridge(), tunnelBridgeArgs, log)
 	case "server":
 		services.Regist(serviceID, mux.NewMuxServerManager(), muxServerArgs, log)
 	case "client":
@ -370,7 +457,7 @@ func Start(serviceID, serviceArgsStr string) (errStr string) {
 	case "sps":
 		services.Regist(serviceID, spsx.NewSPS(), spsArgs, log)
 	case "dns":
-		services.Regist(serviceName, NewDNS(), dnsArgs, log)
+		services.Regist(serviceID, NewDNS(), dnsArgs, log)
 	}
 	_, err = services.Run(serviceID, nil)
 	if err != nil {
--- a/sdk/windows-linux/release_linux.sh
+++ b/sdk/windows-linux/release_linux.sh
@ -1,21 +1,29 @@
 #/bin/bash
-VER="v5.0"
+VERSION=$(cat ../../VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X github.com/snail007/goproxy/sdk/android-ios.SDK_VERSION=$VER -X main.APP_VERSION=$VER"
+TRIMPATH1="/Users/snail/go/src/github.com/snail007"
+TRIMPATH=$(dirname ~/go/src/github.com/snail007)/snail007
+if [ -d "$TRIMPATH1" ];then
+	TRIMPATH=$TRIMPATH1
+fi
+OPTS="-gcflags=-trimpath=$TRIMPATH -asmflags=-trimpath=$TRIMPATH"

 rm -rf sdk-linux-*.tar.gz
 rm -rf README.md libproxy-sdk.so libproxy-sdk.h libproxy-sdk.a

 #linux 32bit
-CGO_ENABLED=1 GOARCH=386 GOOS=linux go build -buildmode=c-archive -ldflags "-s -w" -o libproxy-sdk.a sdk.go
-CGO_ENABLED=1 GOARCH=386 GOOS=linux go build -buildmode=c-shared -ldflags "-s -w" -o libproxy-sdk.so sdk.go
+CGO_ENABLED=1 GOARCH=386 GOOS=linux go build -buildmode=c-archive $OPTS -ldflags "-s -w $X" -o libproxy-sdk.a sdk.go
+CGO_ENABLED=1 GOARCH=386 GOOS=linux go build -buildmode=c-shared $OPTS -ldflags "-s -w $X" -o libproxy-sdk.so sdk.go
 cp ../README.md .
-tar zcf sdk-linux-32bit-${VER}.tar.gz README.md libproxy-sdk.so libproxy-sdk.a libproxy-sdk.h
+tar zcf sdk-linux-32bit-${VERSION}.tar.gz README.md libproxy-sdk.so libproxy-sdk.a libproxy-sdk.h
 rm -rf README.md libproxy-sdk.so libproxy-sdk.h libproxy-sdk.a

 #linux 64bit
-CGO_ENABLED=1 GOARCH=amd64 GOOS=linux go build -buildmode=c-archive -ldflags "-s -w" -o libproxy-sdk.a sdk.go
-CGO_ENABLED=1 GOARCH=amd64 GOOS=linux go build -buildmode=c-shared -ldflags "-s -w" -o libproxy-sdk.so sdk.go
+CGO_ENABLED=1 GOARCH=amd64 GOOS=linux go build -buildmode=c-archive $OPTS -ldflags "-s -w $X" -o libproxy-sdk.a sdk.go
+CGO_ENABLED=1 GOARCH=amd64 GOOS=linux go build -buildmode=c-shared $OPTS -ldflags "-s -w $X" -o libproxy-sdk.so sdk.go
 cp ../README.md .
-tar zcf sdk-linux-64bit-${VER}.tar.gz README.md libproxy-sdk.so libproxy-sdk.a libproxy-sdk.h
+tar zcf sdk-linux-64bit-${VERSION}.tar.gz README.md libproxy-sdk.so libproxy-sdk.a libproxy-sdk.h
 rm -rf README.md libproxy-sdk.so libproxy-sdk.h libproxy-sdk.a

 echo "done."
--- a/sdk/windows-linux/release_mac.sh
+++ b/sdk/windows-linux/release_mac.sh
@ -1,13 +1,21 @@
 #/bin/bash
-VER="v5.0"
+VERSION=$(cat ../../VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X github.com/snail007/goproxy/sdk/android-ios.SDK_VERSION=$VER -X main.APP_VERSION=$VER"
+TRIMPATH1="/Users/snail/go/src/github.com/snail007"
+TRIMPATH=$(dirname ~/go/src/github.com/snail007)/snail007
+if [ -d "$TRIMPATH1" ];then
+	TRIMPATH=$TRIMPATH1
+fi
+OPTS="-gcflags=-trimpath=$TRIMPATH -asmflags=-trimpath=$TRIMPATH"

 rm -rf *.tar.gz
 rm -rf README.md libproxy-sdk.dylib libproxy-sdk.h

 #mac  , macos required
-CGO_ENABLED=1 GOARCH=amd64 GOOS=darwin go build -buildmode=c-shared -ldflags "-s -w" -o libproxy-sdk.dylib sdk.go
+CGO_ENABLED=1 GOARCH=amd64 GOOS=darwin go build -buildmode=c-shared $OPTS -ldflags "-s -w $X" -o libproxy-sdk.dylib sdk.go
 cp ../README.md .
-tar zcf sdk-mac-${VER}.tar.gz README.md libproxy-sdk.dylib libproxy-sdk.h
+tar zcf sdk-mac-${VERSION}.tar.gz README.md libproxy-sdk.dylib libproxy-sdk.h
 rm -rf README.md libproxy-sdk.dylib libproxy-sdk.h

 echo "done."
--- a/sdk/windows-linux/release_windows.sh
+++ b/sdk/windows-linux/release_windows.sh
@ -1,8 +1,16 @@
 #/bin/bash
-VER="v5.0"
+VERSION=$(cat ../../VERSION)
+VER="${VERSION}_$(date '+%Y%m%d%H%M%S')"
+X="-X github.com/snail007/goproxy/sdk/android-ios.SDK_VERSION=$VER -X main.APP_VERSION=$VER"
+TRIMPATH1="/Users/snail/go/src/github.com/snail007"
+TRIMPATH=$(dirname ~/go/src/github.com/snail007)/snail007
+if [ -d "$TRIMPATH1" ];then
+	TRIMPATH=$TRIMPATH1
+fi
+OPTS="-gcflags=-trimpath=$TRIMPATH -asmflags=-trimpath=$TRIMPATH"

-sudo rm /usr/local/go
-sudo ln -s /usr/local/go1.10.1 /usr/local/go
+#sudo rm /usr/local/go
+#sudo ln -s /usr/local/go1.10.1 /usr/local/go
 rm -rf sdk-windows-*.tar.gz
 rm -rf README.md proxy-sdk.h proxy-sdk.dll

@ -11,18 +19,18 @@ rm -rf README.md proxy-sdk.h proxy-sdk.dll
 #apt-get install gcc-mingw-w64

 #windows 64bit
-CC=x86_64-w64-mingw32-gcc GOARCH=amd64 CGO_ENABLED=1 GOOS=windows go build -buildmode=c-shared -ldflags "-s -w" -o proxy-sdk.dll sdk.go
+CC=x86_64-w64-mingw32-gcc GOARCH=amd64 CGO_ENABLED=1 GOOS=windows go build $OPTS -buildmode=c-shared -ldflags "-s -w $X" -o proxy-sdk.dll sdk.go
 cp ../README.md .
-tar zcf sdk-windows-64bit-${VER}.tar.gz README.md proxy-sdk.dll proxy-sdk.h ieshims.dll
+tar zcf sdk-windows-64bit-${VERSION}.tar.gz README.md proxy-sdk.dll proxy-sdk.h ieshims.dll
 rm -rf README.md proxy-sdk.h proxy-sdk.dll

 #windows 32bit
-CC=i686-w64-mingw32-gcc-win32 GOARCH=386 CGO_ENABLED=1 GOOS=windows go build -buildmode=c-shared -ldflags "-s -w" -o proxy-sdk.dll sdk.go
+CC=i686-w64-mingw32-gcc-win32 GOARCH=386 CGO_ENABLED=1 GOOS=windows go build $OPTS -buildmode=c-shared -ldflags "-s -w $X" -o proxy-sdk.dll sdk.go
 cp ../README.md .
-tar zcf sdk-windows-32bit-${VER}.tar.gz README.md proxy-sdk.dll proxy-sdk.h ieshims.dll
+tar zcf sdk-windows-32bit-${VERSION}.tar.gz README.md proxy-sdk.dll proxy-sdk.h ieshims.dll
 rm -rf README.md proxy-sdk.h proxy-sdk.dll

-sudo rm /usr/local/go
-sudo ln -s /usr/local/go1.8.5 /usr/local/go
+#sudo rm /usr/local/go
+#sudo ln -s /usr/local/go1.8.5 /usr/local/go

 echo "done."
--- a/services/http/http.go
+++ b/services/http/http.go
@ -1,6 +1,7 @@
 package http

 import (
+	"crypto/tls"
 	"fmt"
 	"io"
 	"io/ioutil"
@ -11,8 +12,15 @@ import (
 	"strings"
 	"time"

+	server "github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
+	"github.com/snail007/goproxy/utils/datasize"
+	"github.com/snail007/goproxy/utils/dnsx"
+	"github.com/snail007/goproxy/utils/iolimiter"
+	"github.com/snail007/goproxy/utils/lb"
+	"github.com/snail007/goproxy/utils/mapx"
+
 	"github.com/snail007/goproxy/utils"
 	"github.com/snail007/goproxy/utils/conncrypt"

@ -20,72 +28,85 @@ import (
 )

 type HTTPArgs struct {
-	Parent              *string
-	CertFile            *string
-	KeyFile             *string
-	CaCertFile          *string
-	CaCertBytes         []byte
-	CertBytes           []byte
-	KeyBytes            []byte
-	Local               *string
-	Always              *bool
-	HTTPTimeout         *int
-	Interval            *int
-	Blocked             *string
-	Direct              *string
-	AuthFile            *string
-	Auth                *[]string
-	AuthURL             *string
-	AuthURLOkCode       *int
-	AuthURLTimeout      *int
-	AuthURLRetry        *int
-	ParentType          *string
-	LocalType           *string
-	Timeout             *int
-	CheckParentInterval *int
-	SSHKeyFile          *string
-	SSHKeyFileSalt      *string
-	SSHPassword         *string
-	SSHUser             *string
-	SSHKeyBytes         []byte
-	SSHAuthMethod       ssh.AuthMethod
-	KCP                 kcpcfg.KCPConfigArgs
-	LocalIPS            *[]string
-	DNSAddress          *string
-	DNSTTL              *int
-	LocalKey            *string
-	ParentKey           *string
-	LocalCompress       *bool
-	ParentCompress      *bool
+	Parent                *[]string
+	CertFile              *string
+	KeyFile               *string
+	CaCertFile            *string
+	CaCertBytes           []byte
+	CertBytes             []byte
+	KeyBytes              []byte
+	Local                 *string
+	Always                *bool
+	HTTPTimeout           *int
+	Interval              *int
+	Blocked               *string
+	Direct                *string
+	AuthFile              *string
+	Auth                  *[]string
+	AuthURL               *string
+	AuthURLOkCode         *int
+	AuthURLTimeout        *int
+	AuthURLRetry          *int
+	ParentType            *string
+	LocalType             *string
+	Timeout               *int
+	CheckParentInterval   *int
+	SSHKeyFile            *string
+	SSHKeyFileSalt        *string
+	SSHPassword           *string
+	SSHUser               *string
+	SSHKeyBytes           []byte
+	SSHAuthMethod         ssh.AuthMethod
+	KCP                   kcpcfg.KCPConfigArgs
+	LocalIPS              *[]string
+	DNSAddress            *string
+	DNSTTL                *int
+	LocalKey              *string
+	ParentKey             *string
+	LocalCompress         *bool
+	ParentCompress        *bool
+	LoadBalanceMethod     *string
+	LoadBalanceTimeout    *int
+	LoadBalanceRetryTime  *int
+	LoadBalanceHashTarget *bool
+	LoadBalanceOnlyHA     *bool
+
+	RateLimit      *string
+	RateLimitBytes float64
+	BindListen     *bool
+	Debug          *bool
 }
 type HTTP struct {
-	outPool        utils.OutConn
 	cfg            HTTPArgs
 	checker        utils.Checker
 	basicAuth      utils.BasicAuth
 	sshClient      *ssh.Client
 	lockChn        chan bool
-	domainResolver utils.DomainResolver
+	domainResolver dnsx.DomainResolver
 	isStop         bool
-	serverChannels []*utils.ServerChannel
-	userConns      utils.ConcurrentMap
+	serverChannels []*server.ServerChannel
+	userConns      mapx.ConcurrentMap
 	log            *logger.Logger
+	lb             *lb.Group
 }

 func NewHTTP() services.Service {
 	return &HTTP{
-		outPool:        utils.OutConn{},
 		cfg:            HTTPArgs{},
 		checker:        utils.Checker{},
 		basicAuth:      utils.BasicAuth{},
 		lockChn:        make(chan bool, 1),
 		isStop:         false,
-		serverChannels: []*utils.ServerChannel{},
-		userConns:      utils.NewConcurrentMap(),
+		serverChannels: []*server.ServerChannel{},
+		userConns:      mapx.NewConcurrentMap(),
 	}
 }
 func (s *HTTP) CheckArgs() (err error) {
-	if *s.cfg.Parent != "" && *s.cfg.ParentType == "" {
+
+	if len(*s.cfg.Parent) == 1 && (*s.cfg.Parent)[0] == "" {
+		(*s.cfg.Parent) = []string{}
+	}
+	if len(*s.cfg.Parent) > 0 && *s.cfg.ParentType == "" {
 		err = fmt.Errorf("parent type unkown,use -T <tls|tcp|ssh|kcp>")
 		return
 	}
@ -133,15 +154,26 @@ func (s *HTTP) CheckArgs() (err error) {
 			s.cfg.SSHAuthMethod = ssh.PublicKeys(SSHSigner)
 		}
 	}
+	if *s.cfg.RateLimit != "0" && *s.cfg.RateLimit != "" {
+		var size uint64
+		size, err = datasize.Parse(*s.cfg.RateLimit)
+		if err != nil {
+			err = fmt.Errorf("parse rate limit size error,ERR:%s", err)
+			return
+		}
+		s.cfg.RateLimitBytes = float64(size)
+	}
 	return
 }
 func (s *HTTP) InitService() (err error) {
 	s.InitBasicAuth()
-	if *s.cfg.Parent != "" {
+	//init lb
+	if len(*s.cfg.Parent) > 0 {
 		s.checker = utils.NewChecker(*s.cfg.HTTPTimeout, int64(*s.cfg.Interval), *s.cfg.Blocked, *s.cfg.Direct, s.log)
+		s.InitLB()
 	}
 	if *s.cfg.DNSAddress != "" {
-		(*s).domainResolver = utils.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
+		s.domainResolver = dnsx.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
 	}
 	if *s.cfg.ParentType == "ssh" {
 		err = s.ConnectSSH()
@ -150,12 +182,17 @@ func (s *HTTP) InitService() (err error) {
 			return
 		}
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			//循环检查ssh网络连通性
 			for {
 				if s.isStop {
 					return
 				}
-				conn, err := utils.ConnectHost(s.Resolve(*s.cfg.Parent), *s.cfg.Timeout*2)
+				conn, err := utils.ConnectHost(s.Resolve(s.lb.Select("", *s.cfg.LoadBalanceOnlyHA)), *s.cfg.Timeout*2)
 				if err == nil {
 					conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
 					_, err = conn.Write([]byte{0})
@ -187,9 +224,22 @@ func (s *HTTP) StopService() {
 		} else {
 			s.log.Printf("service http(s) stoped")
 		}
+		s.basicAuth = utils.BasicAuth{}
+		s.cfg = HTTPArgs{}
+		s.checker = utils.Checker{}
+		s.domainResolver = dnsx.DomainResolver{}
+		s.lb = nil
+		s.lockChn = nil
+		s.log = nil
+		s.serverChannels = nil
+		s.sshClient = nil
+		s.userConns = nil
+		s = nil
 	}()
 	s.isStop = true
-	s.checker.Stop()
+	if len(*s.cfg.Parent) > 0 {
+		s.checker.Stop()
+	}
 	if s.sshClient != nil {
 		s.sshClient.Close()
 	}
@ -201,6 +251,9 @@ func (s *HTTP) StopService() {
 			(*sc.UDPListener).Close()
 		}
 	}
+	if s.lb != nil {
+		s.lb.Stop()
+	}
 }
 func (s *HTTP) Start(args interface{}, log *logger.Logger) (err error) {
 	s.log = log
@ -213,20 +266,19 @@ func (s *HTTP) Start(args interface{}, log *logger.Logger) (err error) {
 		return
 	}

-	if *s.cfg.Parent != "" {
-		s.log.Printf("use %s parent %s", *s.cfg.ParentType, *s.cfg.Parent)
-		s.InitOutConnPool()
+	if len(*s.cfg.Parent) > 0 {
+		s.log.Printf("use %s parent %v [ %s ]", *s.cfg.ParentType, *s.cfg.Parent, strings.ToUpper(*s.cfg.LoadBalanceMethod))
 	}

 	for _, addr := range strings.Split(*s.cfg.Local, ",") {
 		if addr != "" {
 			host, port, _ := net.SplitHostPort(addr)
 			p, _ := strconv.Atoi(port)
-			sc := utils.NewServerChannel(host, p, s.log)
+			sc := server.NewServerChannel(host, p, s.log)
 			if *s.cfg.LocalType == "tcp" {
 				err = sc.ListenTCP(s.callback)
 			} else if *s.cfg.LocalType == "tls" {
-				err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes, s.callback)
+				err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes, s.callback)
 			} else if *s.cfg.LocalType == "kcp" {
 				err = sc.ListenKCP(s.cfg.KCP, s.callback, s.log)
 			}
@ -270,9 +322,9 @@ func (s *HTTP) callback(inConn net.Conn) {
 	address := req.Host
 	host, _, _ := net.SplitHostPort(address)
 	useProxy := false
-	if !utils.IsIternalIP(host, *s.cfg.Always) {
+	if !utils.IsInternalIP(host, *s.cfg.Always) {
 		useProxy = true
-		if *s.cfg.Parent == "" {
+		if len(*s.cfg.Parent) == 0 {
 			useProxy = false
 		} else if *s.cfg.Always {
 			useProxy = true
@ -288,17 +340,17 @@ func (s *HTTP) callback(inConn net.Conn) {

 	s.log.Printf("use proxy : %v, %s", useProxy, address)

-	err = s.OutToTCP(useProxy, address, &inConn, &req)
+	lbAddr, err := s.OutToTCP(useProxy, address, &inConn, &req)
 	if err != nil {
-		if *s.cfg.Parent == "" {
+		if len(*s.cfg.Parent) == 0 {
 			s.log.Printf("connect to %s fail, ERR:%s", address, err)
 		} else {
-			s.log.Printf("connect to %s parent %s fail", *s.cfg.ParentType, *s.cfg.Parent)
+			s.log.Printf("connect to %s parent %v fail", *s.cfg.ParentType, lbAddr)
 		}
 		utils.CloseConn(&inConn)
 	}
 }
-func (s *HTTP) OutToTCP(useProxy bool, address string, inConn *net.Conn, req *utils.HTTPRequest) (err interface{}) {
+func (s *HTTP) OutToTCP(useProxy bool, address string, inConn *net.Conn, req *utils.HTTPRequest) (lbAddr string, err interface{}) {
 	inAddr := (*inConn).RemoteAddr().String()
 	inLocalAddr := (*inConn).LocalAddr().String()
 	//防止死循环
@ -315,25 +367,26 @@ func (s *HTTP) OutToTCP(useProxy bool, address string, inConn *net.Conn, req *ut
 			return
 		}
 		if useProxy {
-			if *s.cfg.ParentType == "ssh" {
-				outConn, err = s.getSSHConn(address)
-			} else {
-				// s.log.Printf("%v", s.outPool)
-				outConn, err = s.outPool.Get()
+			// s.log.Printf("%v", s.outPool)
+			selectAddr := (*inConn).RemoteAddr().String()
+			if utils.LBMethod(*s.cfg.LoadBalanceMethod) == lb.SELECT_HASH && *s.cfg.LoadBalanceHashTarget {
+				selectAddr = address
 			}
+			lbAddr = s.lb.Select(selectAddr, *s.cfg.LoadBalanceOnlyHA)
+			outConn, err = s.GetParentConn(lbAddr)
 		} else {
-			outConn, err = utils.ConnectHost(s.Resolve(address), *s.cfg.Timeout)
+			outConn, err = s.GetDirectConn(s.Resolve(address), inLocalAddr)
 		}
 		tryCount++
 		if err == nil || tryCount > maxTryCount {
 			break
 		} else {
-			s.log.Printf("connect to %s , err:%s,retrying...", *s.cfg.Parent, err)
+			s.log.Printf("connect to %s , err:%s,retrying...", lbAddr, err)
 			time.Sleep(time.Second * 2)
 		}
 	}
 	if err != nil {
-		s.log.Printf("connect to %s , err:%s", *s.cfg.Parent, err)
+		s.log.Printf("connect to %s , err:%s", lbAddr, err)
 		utils.CloseConn(inConn)
 		return
 	}
@ -345,6 +398,7 @@ func (s *HTTP) OutToTCP(useProxy bool, address string, inConn *net.Conn, req *ut
 			Password: *s.cfg.ParentKey,
 		})
 	}
+
 	outAddr := outConn.RemoteAddr().String()
 	//outLocalAddr := outConn.LocalAddr().String()
 	if req.IsHTTPS() && (!useProxy || *s.cfg.ParentType == "ssh") {
@ -353,29 +407,39 @@ func (s *HTTP) OutToTCP(useProxy bool, address string, inConn *net.Conn, req *ut
 	} else {
 		//https或者http,上级是代理,proxy需要转发
 		outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		//直连目标或上级非代理或非SNI,清理HTTP头部的代理头信息.
-		if (!useProxy || *s.cfg.ParentType == "ssh") && !req.IsSNI {
+		//直连目标或上级非代理或非SNI,,清理HTTP头部的代理头信息
+		if !useProxy || *s.cfg.ParentType == "ssh" && !req.IsSNI {
 			_, err = outConn.Write(utils.RemoveProxyHeaders(req.HeadBuf))
 		} else {
 			_, err = outConn.Write(req.HeadBuf)
 		}
 		outConn.SetDeadline(time.Time{})
 		if err != nil {
-			s.log.Printf("write to %s , err:%s", *s.cfg.Parent, err)
+			s.log.Printf("write to %s , err:%s", lbAddr, err)
 			utils.CloseConn(inConn)
 			return
 		}
 	}

+	if s.cfg.RateLimitBytes > 0 {
+		outConn = iolimiter.NewReaderConn(outConn, s.cfg.RateLimitBytes)
+	}
+
 	utils.IoBind((*inConn), outConn, func(err interface{}) {
 		s.log.Printf("conn %s - %s released [%s]", inAddr, outAddr, req.Host)
 		s.userConns.Remove(inAddr)
+		if len(*s.cfg.Parent) > 0 {
+			s.lb.DecreaseConns(lbAddr)
+		}
 	}, s.log)
 	s.log.Printf("conn %s - %s connected [%s]", inAddr, outAddr, req.Host)
 	if c, ok := s.userConns.Get(inAddr); ok {
 		(*c.(*net.Conn)).Close()
 	}
 	s.userConns.Set(inAddr, inConn)
+	if len(*s.cfg.Parent) > 0 {
+		s.lb.IncreasConns(lbAddr)
+	}
 	return
 }

@ -432,24 +496,11 @@ func (s *HTTP) ConnectSSH() (err error) {
 	if s.sshClient != nil {
 		s.sshClient.Close()
 	}
-	s.sshClient, err = ssh.Dial("tcp", s.Resolve(*s.cfg.Parent), &config)
+	s.sshClient, err = ssh.Dial("tcp", s.Resolve(s.lb.Select("", *s.cfg.LoadBalanceOnlyHA)), &config)
 	<-s.lockChn
 	return
 }
-func (s *HTTP) InitOutConnPool() {
-	if *s.cfg.ParentType == "tls" || *s.cfg.ParentType == "tcp" || *s.cfg.ParentType == "kcp" {
-		//dur int, isTLS bool, certBytes, keyBytes []byte,
-		//parent string, timeout int, InitialCap int, MaxCap int
-		s.outPool = utils.NewOutConn(
-			*s.cfg.CheckParentInterval,
-			*s.cfg.ParentType,
-			s.cfg.KCP,
-			s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes,
-			s.Resolve(*s.cfg.Parent),
-			*s.cfg.Timeout,
-		)
-	}
-}
+
 func (s *HTTP) InitBasicAuth() (err error) {
 	if *s.cfg.DNSAddress != "" {
 		s.basicAuth = utils.NewBasicAuth(&(*s).domainResolver, s.log)
@ -475,6 +526,27 @@ func (s *HTTP) InitBasicAuth() (err error) {
 	}
 	return
 }
+func (s *HTTP) InitLB() {
+	configs := lb.BackendsConfig{}
+	for _, addr := range *s.cfg.Parent {
+		_addrInfo := strings.Split(addr, "@")
+		_addr := _addrInfo[0]
+		weight := 1
+		if len(_addrInfo) == 2 {
+			weight, _ = strconv.Atoi(_addrInfo[1])
+		}
+		configs = append(configs, &lb.BackendConfig{
+			Address:       _addr,
+			Weight:        weight,
+			ActiveAfter:   1,
+			InactiveAfter: 2,
+			Timeout:       time.Duration(*s.cfg.LoadBalanceTimeout) * time.Millisecond,
+			RetryTime:     time.Duration(*s.cfg.LoadBalanceRetryTime) * time.Millisecond,
+		})
+	}
+	LB := lb.NewGroup(utils.LBMethod(*s.cfg.LoadBalanceMethod), configs, &s.domainResolver, s.log, *s.cfg.Debug)
+	s.lb = &LB
+}
 func (s *HTTP) IsBasicAuth() bool {
 	return *s.cfg.AuthFile != "" || len(*s.cfg.Auth) > 0 || *s.cfg.AuthURL != ""
 }
@ -492,7 +564,7 @@ func (s *HTTP) IsDeadLoop(inLocalAddr string, host string) bool {
 		if *s.cfg.DNSAddress != "" {
 			outIPs = []net.IP{net.ParseIP(s.Resolve(outDomain))}
 		} else {
-			outIPs, err = net.LookupIP(outDomain)
+			outIPs, err = utils.LookupIP(outDomain)
 		}
 		if err == nil {
 			for _, ip := range outIPs {
@ -528,3 +600,39 @@ func (s *HTTP) Resolve(address string) string {
 	}
 	return ip
 }
+func (s *HTTP) GetParentConn(address string) (conn net.Conn, err error) {
+	if *s.cfg.ParentType == "tls" {
+		var _conn tls.Conn
+		_conn, err = utils.TlsConnectHost(address, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes)
+		if err == nil {
+			conn = net.Conn(&_conn)
+		}
+	} else if *s.cfg.ParentType == "kcp" {
+		conn, err = utils.ConnectKCPHost(address, s.cfg.KCP)
+	} else if *s.cfg.ParentType == "ssh" {
+		var e interface{}
+		conn, e = s.getSSHConn(address)
+		if e != nil {
+			err = fmt.Errorf("%s", e)
+		}
+	} else {
+		conn, err = utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	return
+}
+func (s *HTTP) GetDirectConn(address string, localAddr string) (conn net.Conn, err error) {
+	if !*s.cfg.BindListen {
+		return utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	ip, _, _ := net.SplitHostPort(localAddr)
+	if utils.IsInternalIP(ip, false) {
+		return utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	local, _ := net.ResolveTCPAddr("tcp", ip+":0")
+	d := net.Dialer{
+		Timeout:   time.Millisecond * time.Duration(*s.cfg.Timeout),
+		LocalAddr: local,
+	}
+	conn, err = d.Dial("tcp", address)
+	return
+}
--- a/services/mux/mux_bridge.go
+++ b/services/mux/mux_bridge.go
@ -7,50 +7,51 @@ import (
 	logger "log"
 	"math/rand"
 	"net"
-	"strconv"
+	"runtime/debug"
 	"strings"
 	"sync"
 	"time"

+	srvtransport "github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/mapx"
 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
 )

-const (
-	CONN_SERVER = uint8(4)
-	CONN_CLIENT = uint8(5)
-)
-
 type MuxBridgeArgs struct {
-	CertFile   *string
-	KeyFile    *string
-	CertBytes  []byte
-	KeyBytes   []byte
-	Local      *string
-	LocalType  *string
-	Timeout    *int
-	IsCompress *bool
-	KCP        kcpcfg.KCPConfigArgs
+	CertFile     *string
+	KeyFile      *string
+	CertBytes    []byte
+	KeyBytes     []byte
+	Local        *string
+	LocalType    *string
+	Timeout      *int
+	IsCompress   *bool
+	KCP          kcpcfg.KCPConfigArgs
+	TCPSMethod   *string
+	TCPSPassword *string
+	TOUMethod    *string
+	TOUPassword  *string
 }
 type MuxBridge struct {
 	cfg                MuxBridgeArgs
-	clientControlConns utils.ConcurrentMap
-	serverConns        utils.ConcurrentMap
+	clientControlConns mapx.ConcurrentMap
+	serverConns        mapx.ConcurrentMap
 	router             utils.ClientKeyRouter
 	l                  *sync.Mutex
 	isStop             bool
-	sc                 *utils.ServerChannel
+	sc                 *srvtransport.ServerChannel
 	log                *logger.Logger
 }

 func NewMuxBridge() services.Service {
 	b := &MuxBridge{
 		cfg:                MuxBridgeArgs{},
-		clientControlConns: utils.NewConcurrentMap(),
-		serverConns:        utils.NewConcurrentMap(),
+		clientControlConns: mapx.NewConcurrentMap(),
+		serverConns:        mapx.NewConcurrentMap(),
 		l:                  &sync.Mutex{},
 		isStop:             false,
 	}
@ -82,13 +83,21 @@ func (s *MuxBridge) StopService() {
 		} else {
 			s.log.Printf("service bridge stoped")
 		}
+		s.cfg = MuxBridgeArgs{}
+		s.clientControlConns = nil
+		s.l = nil
+		s.log = nil
+		s.router = utils.ClientKeyRouter{}
+		s.sc = nil
+		s.serverConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	if s.sc != nil && (*s.sc).Listener != nil {
 		(*(*s.sc).Listener).Close()
 	}
 	for _, g := range s.clientControlConns.Items() {
-		for _, session := range g.(*utils.ConcurrentMap).Items() {
+		for _, session := range g.(*mapx.ConcurrentMap).Items() {
 			(session.(*smux.Session)).Close()
 		}
 	}
@ -106,21 +115,27 @@ func (s *MuxBridge) Start(args interface{}, log *logger.Logger) (err error) {
 		return
 	}

-	host, port, _ := net.SplitHostPort(*s.cfg.Local)
-	p, _ := strconv.Atoi(port)
-	sc := utils.NewServerChannel(host, p, s.log)
+	sc := srvtransport.NewServerChannelHost(*s.cfg.Local, s.log)
 	if *s.cfg.LocalType == "tcp" {
 		err = sc.ListenTCP(s.handler)
 	} else if *s.cfg.LocalType == "tls" {
-		err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.handler)
+		err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.handler)
 	} else if *s.cfg.LocalType == "kcp" {
 		err = sc.ListenKCP(s.cfg.KCP, s.handler, s.log)
+	} else if *s.cfg.LocalType == "tcps" {
+		err = sc.ListenTCPS(*s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, s.handler)
+	} else if *s.cfg.LocalType == "tou" {
+		err = sc.ListenTOU(*s.cfg.TOUMethod, *s.cfg.TOUPassword, false, s.handler)
 	}
 	if err != nil {
 		return
 	}
 	s.sc = &sc
-	s.log.Printf("%s bridge on %s", *s.cfg.LocalType, (*sc.Listener).Addr())
+	if *s.cfg.LocalType == "tou" {
+		s.log.Printf("%s bridge on %s", *s.cfg.LocalType, sc.UDPListener.LocalAddr())
+	} else {
+		s.log.Printf("%s bridge on %s", *s.cfg.LocalType, (*sc.Listener).Addr())
+	}
 	return
 }
 func (s *MuxBridge) Clean() {
@ -200,18 +215,27 @@ func (s *MuxBridge) handler(inConn net.Conn) {
 		index := keyInfo[1]
 		s.l.Lock()
 		defer s.l.Unlock()
+		var group *mapx.ConcurrentMap
 		if !s.clientControlConns.Has(groupKey) {
-			item := utils.NewConcurrentMap()
-			s.clientControlConns.Set(groupKey, &item)
+			_g := mapx.NewConcurrentMap()
+			group = &_g
+			s.clientControlConns.Set(groupKey, group)
+			//s.log.Printf("init client session group %s", groupKey)
+		} else {
+			_group, _ := s.clientControlConns.Get(groupKey)
+			group = _group.(*mapx.ConcurrentMap)
 		}
-		_group, _ := s.clientControlConns.Get(groupKey)
-		group := _group.(*utils.ConcurrentMap)
 		if v, ok := group.Get(index); ok {
 			v.(*smux.Session).Close()
 		}
 		group.Set(index, session)
-		// s.clientControlConns.Set(key, session)
+		//s.log.Printf("set client session %s to group %s,grouplen:%d", index, groupKey, group.Count())
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			for {
 				if s.isStop {
 					return
@ -221,10 +245,12 @@ func (s *MuxBridge) handler(inConn net.Conn) {
 					defer s.l.Unlock()
 					if sess, ok := group.Get(index); ok && sess.(*smux.Session).IsClosed() {
 						group.Remove(index)
+						//s.log.Printf("client session %s removed from group %s, grouplen:%d", key, groupKey, group.Count())
 						s.log.Printf("client connection %s released", key)
 					}
 					if group.IsEmpty() {
 						s.clientControlConns.Remove(groupKey)
+						//s.log.Printf("client session group %s removed", groupKey)
 					}
 					break
 				}
@ -248,15 +274,20 @@ func (s *MuxBridge) callback(inConn net.Conn, serverID, key string) {
 		if key == "*" {
 			key = s.router.GetKey()
 		}
+		//s.log.Printf("server get client session %s", key)
 		_group, ok := s.clientControlConns.Get(key)
 		if !ok {
 			s.log.Printf("client %s session not exists for server stream %s, retrying...", key, serverID)
 			time.Sleep(time.Second * 3)
 			continue
 		}
-		group := _group.(*utils.ConcurrentMap)
-		keys := group.Keys()
+		group := _group.(*mapx.ConcurrentMap)
+		keys := []string{}
+		group.IterCb(func(key string, v interface{}) {
+			keys = append(keys, key)
+		})
 		keysLen := len(keys)
+		//s.log.Printf("client session %s , len:%d , keysLen: %d", key, group.Count(), keysLen)
 		i := 0
 		if keysLen > 0 {
 			i = rand.Intn(keysLen)
@ -280,10 +311,20 @@ func (s *MuxBridge) callback(inConn net.Conn, serverID, key string) {
 			die1 := make(chan bool, 1)
 			die2 := make(chan bool, 1)
 			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+					}
+				}()
 				io.Copy(stream, inConn)
 				die1 <- true
 			}()
 			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+					}
+				}()
 				io.Copy(inConn, stream)
 				die2 <- true
 			}()
--- a/services/mux/mux_client.go
+++ b/services/mux/mux_client.go
@ -6,12 +6,19 @@ import (
 	"io"
 	logger "log"
 	"net"
+	"runtime/debug"
+	"strings"
+	"sync"
 	"time"

 	"github.com/golang/snappy"
+	clienttransport "github.com/snail007/goproxy/core/cs/client"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/jumper"
+	"github.com/snail007/goproxy/utils/mapx"
 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
 )
@ -28,23 +35,41 @@ type MuxClientArgs struct {
 	IsCompress   *bool
 	SessionCount *int
 	KCP          kcpcfg.KCPConfigArgs
+	Jumper       *string
+	TCPSMethod   *string
+	TCPSPassword *string
+	TOUMethod    *string
+	TOUPassword  *string
+}
+type ClientUDPConnItem struct {
+	conn      *smux.Stream
+	isActive  bool
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	udpConn   *net.UDPConn
+	connid    string
 }
 type MuxClient struct {
 	cfg      MuxClientArgs
 	isStop   bool
-	sessions utils.ConcurrentMap
+	sessions mapx.ConcurrentMap
 	log      *logger.Logger
+	jumper   *jumper.Jumper
+	udpConns mapx.ConcurrentMap
 }

 func NewMuxClient() services.Service {
 	return &MuxClient{
 		cfg:      MuxClientArgs{},
 		isStop:   false,
-		sessions: utils.NewConcurrentMap(),
+		sessions: mapx.NewConcurrentMap(),
+		udpConns: mapx.NewConcurrentMap(),
 	}
 }

 func (s *MuxClient) InitService() (err error) {
+	s.UDPGCDeamon()
 	return
 }

@ -65,6 +90,19 @@ func (s *MuxClient) CheckArgs() (err error) {
 			return
 		}
 	}
+	if *s.cfg.Jumper != "" {
+		if *s.cfg.ParentType != "tls" && *s.cfg.ParentType != "tcp" {
+			err = fmt.Errorf("jumper only worked of -T is tls or tcp")
+			return
+		}
+		var j jumper.Jumper
+		j, err = jumper.New(*s.cfg.Jumper, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err != nil {
+			err = fmt.Errorf("parse jumper fail, err %s", err)
+			return
+		}
+		s.jumper = &j
+	}
 	return
 }
 func (s *MuxClient) StopService() {
@ -75,6 +113,12 @@ func (s *MuxClient) StopService() {
 		} else {
 			s.log.Printf("service client stoped")
 		}
+		s.cfg = MuxClientArgs{}
+		s.jumper = nil
+		s.log = nil
+		s.sessions = nil
+		s.udpConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	for _, sess := range s.sessions.Items() {
@ -102,7 +146,7 @@ func (s *MuxClient) Start(args interface{}, log *logger.Logger) (err error) {
 			defer func() {
 				e := recover()
 				if e != nil {
-					s.log.Printf("session worker crashed: %s", e)
+					s.log.Printf("session worker crashed: %s\nstack:%s", e, string(debug.Stack()))
 				}
 			}()
 			for {
@ -116,7 +160,16 @@ func (s *MuxClient) Start(args interface{}, log *logger.Logger) (err error) {
 					continue
 				}
 				conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-				_, err = conn.Write(utils.BuildPacket(CONN_CLIENT, fmt.Sprintf("%s-%d", *s.cfg.Key, i)))
+				g := sync.WaitGroup{}
+				g.Add(1)
+				go func() {
+					defer func() {
+						_ = recover()
+						g.Done()
+					}()
+					_, err = conn.Write(utils.BuildPacket(CONN_CLIENT, fmt.Sprintf("%s-%d", *s.cfg.Key, i)))
+				}()
+				g.Wait()
 				conn.SetDeadline(time.Time{})
 				if err != nil {
 					conn.Close()
@ -162,7 +215,7 @@ func (s *MuxClient) Start(args interface{}, log *logger.Logger) (err error) {
 							stream.Close()
 							return
 						}
-						s.log.Printf("worker[%d] signal revecived,server %s stream %s %s", i, serverID, ID, clientLocalAddr)
+						//s.log.Printf("worker[%d] signal revecived,server %s stream %s %s", i, serverID, ID, clientLocalAddr)
 						protocol := clientLocalAddr[:3]
 						localAddr := clientLocalAddr[4:]
 						if protocol == "udp" {
@ -182,89 +235,180 @@ func (s *MuxClient) Clean() {
 }
 func (s *MuxClient) getParentConn() (conn net.Conn, err error) {
 	if *s.cfg.ParentType == "tls" {
-		var _conn tls.Conn
-		_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
-		if err == nil {
-			conn = net.Conn(&_conn)
+		if s.jumper == nil {
+			var _conn tls.Conn
+			_conn, err = clienttransport.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err == nil {
+				conn = net.Conn(&_conn)
+			}
+		} else {
+			conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err != nil {
+				return nil, err
+			}
+			var _c net.Conn
+			_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+			if err == nil {
+				conn = net.Conn(tls.Client(_c, conf))
+			}
 		}
+
 	} else if *s.cfg.ParentType == "kcp" {
-		conn, err = utils.ConnectKCPHost(*s.cfg.Parent, s.cfg.KCP)
+		conn, err = clienttransport.KCPConnectHost(*s.cfg.Parent, s.cfg.KCP)
+	} else if *s.cfg.ParentType == "tcps" {
+		if s.jumper == nil {
+			conn, err = clienttransport.TCPSConnectHost(*s.cfg.Parent, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, *s.cfg.Timeout)
+		} else {
+			conn, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+			if err == nil {
+				conn, err = encryptconn.NewConn(conn, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword)
+			}
+		}
+
+	} else if *s.cfg.ParentType == "tou" {
+		conn, err = clienttransport.TOUConnectHost(*s.cfg.Parent, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, *s.cfg.Timeout)
 	} else {
-		conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
+		if s.jumper == nil {
+			conn, err = clienttransport.TCPConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
+		} else {
+			conn, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		}
 	}
 	return
 }
 func (s *MuxClient) ServeUDP(inConn *smux.Stream, localAddr, ID string) {
-
+	var item *ClientUDPConnItem
+	var body []byte
+	var err error
+	srcAddr := ""
+	defer func() {
+		if item != nil {
+			(*item).conn.Close()
+			(*item).udpConn.Close()
+			s.udpConns.Remove(srcAddr)
+			inConn.Close()
+		}
+	}()
 	for {
 		if s.isStop {
 			return
 		}
-		inConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		srcAddr, body, err := utils.ReadUDPPacket(inConn)
-		inConn.SetDeadline(time.Time{})
+		srcAddr, body, err = utils.ReadUDPPacket(inConn)
 		if err != nil {
-			s.log.Printf("udp packet revecived fail, err: %s", err)
-			s.log.Printf("connection %s released", ID)
-			inConn.Close()
-			break
+			if strings.Contains(err.Error(), "n != int(") {
+				continue
+			}
+			if !utils.IsNetDeadlineErr(err) && err != io.EOF {
+				s.log.Printf("udp packet revecived from bridge fail, err: %s", err)
+			}
+			return
+		}
+		if v, ok := s.udpConns.Get(srcAddr); !ok {
+			_srcAddr, _ := net.ResolveUDPAddr("udp", srcAddr)
+			zeroAddr, _ := net.ResolveUDPAddr("udp", ":")
+			_localAddr, _ := net.ResolveUDPAddr("udp", localAddr)
+			c, err := net.DialUDP("udp", zeroAddr, _localAddr)
+			if err != nil {
+				s.log.Printf("create local udp conn fail, err : %s", err)
+				inConn.Close()
+				return
+			}
+			item = &ClientUDPConnItem{
+				conn:      inConn,
+				srcAddr:   _srcAddr,
+				localAddr: _localAddr,
+				udpConn:   c,
+				connid:    ID,
+			}
+			s.udpConns.Set(srcAddr, item)
+			s.UDPRevecive(srcAddr, ID)
 		} else {
-			//s.log.Printf("udp packet revecived:%s,%v", srcAddr, body)
+			item = v.(*ClientUDPConnItem)
+		}
+		(*item).touchtime = time.Now().Unix()
+		go func() {
+			defer func() { _ = recover() }()
+			(*item).udpConn.Write(body)
+		}()
+	}
+}
+func (s *MuxClient) UDPRevecive(key, ID string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", ID)
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s, connid : %s", key, ID)
+			return
+		}
+		cui := v.(*ClientUDPConnItem)
+		buf := utils.LeakyBuffer.Get()
+		defer func() {
+			utils.LeakyBuffer.Put(buf)
+			cui.conn.Close()
+			cui.udpConn.Close()
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", ID)
+		}()
+		for {
+			n, err := cui.udpConn.Read(buf)
+			if err != nil {
+				if !utils.IsNetClosedErr(err) {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			cui.touchtime = time.Now().Unix()
 			go func() {
 				defer func() {
 					if e := recover(); e != nil {
-						s.log.Printf("client processUDPPacket crashed,err: %s", e)
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
 					}
 				}()
-				s.processUDPPacket(inConn, srcAddr, localAddr, body)
+				cui.conn.SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+				_, err = cui.conn.Write(utils.UDPPacket(cui.srcAddr.String(), buf[:n]))
+				cui.conn.SetWriteDeadline(time.Time{})
+				if err != nil {
+					cui.udpConn.Close()
+					return
+				}
 			}()
-
 		}
-
-	}
-	// }
+	}()
 }
-func (s *MuxClient) processUDPPacket(inConn *smux.Stream, srcAddr, localAddr string, body []byte) {
-	dstAddr, err := net.ResolveUDPAddr("udp", localAddr)
-	if err != nil {
-		s.log.Printf("can't resolve address: %s", err)
-		inConn.Close()
-		return
-	}
-	clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-	conn, err := net.DialUDP("udp", clientSrcAddr, dstAddr)
-	if err != nil {
-		s.log.Printf("connect to udp %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-	_, err = conn.Write(body)
-	conn.SetDeadline(time.Time{})
-	if err != nil {
-		s.log.Printf("send udp packet to %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	//s.log.Printf("send udp packet to %s success", dstAddr.String())
-	buf := make([]byte, 1024)
-	conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-	length, _, err := conn.ReadFromUDP(buf)
-	conn.SetDeadline(time.Time{})
-	if err != nil {
-		s.log.Printf("read udp response from %s fail ,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	respBody := buf[0:length]
-	//s.log.Printf("revecived udp packet from %s , %v", dstAddr.String(), respBody)
-	bs := utils.UDPPacket(srcAddr, respBody)
-	(*inConn).SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-	_, err = (*inConn).Write(bs)
-	(*inConn).SetDeadline(time.Time{})
-	if err != nil {
-		s.log.Printf("send udp response fail ,ERR:%s", err)
-		inConn.Close()
-		return
-	}
-	//s.log.Printf("send udp response success ,from:%s ,%d ,%v", dstAddr.String(), len(bs), bs)
+func (s *MuxClient) UDPGCDeamon() {
+	gctime := int64(30)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
+		for {
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*ClientUDPConnItem).touchtime > gctime {
+					(*(v.(*ClientUDPConnItem).conn)).Close()
+					(v.(*ClientUDPConnItem).udpConn).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", v.(*ClientUDPConnItem).connid)
+				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
+			}
+			gcKeys = nil
+		}
+	}()
 }
 func (s *MuxClient) ServeConn(inConn *smux.Stream, localAddr, ID string) {
 	var err error
@ -298,10 +442,20 @@ func (s *MuxClient) ServeConn(inConn *smux.Stream, localAddr, ID string) {
 		die1 := make(chan bool, 1)
 		die2 := make(chan bool, 1)
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			io.Copy(outConn, snappy.NewReader(inConn))
 			die1 <- true
 		}()
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			io.Copy(snappy.NewWriter(inConn), outConn)
 			die2 <- true
 		}()
--- a/services/mux/mux_server.go
+++ b/services/mux/mux_server.go
@ -12,15 +12,26 @@ import (
 	"strings"
 	"time"

+	clienttransport "github.com/snail007/goproxy/core/cs/client"
+	server "github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	encryptconn "github.com/snail007/goproxy/core/lib/transport/encrypt"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/jumper"
+	"github.com/snail007/goproxy/utils/mapx"

 	"github.com/golang/snappy"
 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
 )

+const (
+	CONN_CLIENT_CONTROL = uint8(1)
+	CONN_SERVER         = uint8(4)
+	CONN_CLIENT         = uint8(5)
+)
+
 type MuxServerArgs struct {
 	Parent       *string
 	ParentType   *string
@ -38,17 +49,25 @@ type MuxServerArgs struct {
 	IsCompress   *bool
 	SessionCount *int
 	KCP          kcpcfg.KCPConfigArgs
+	Jumper       *string
+	TCPSMethod   *string
+	TCPSPassword *string
+	TOUMethod    *string
+	TOUPassword  *string
 }
-
-type MuxUDPItem struct {
-	packet    *[]byte
-	localAddr *net.UDPAddr
-	srcAddr   *net.UDPAddr
+type MuxServer struct {
+	cfg      MuxServerArgs
+	sc       server.ServerChannel
+	sessions mapx.ConcurrentMap
+	lockChn  chan bool
+	isStop   bool
+	log      *logger.Logger
+	jumper   *jumper.Jumper
+	udpConns mapx.ConcurrentMap
 }

 type MuxServerManager struct {
 	cfg      MuxServerArgs
-	udpChn   chan MuxUDPItem
 	serverID string
 	servers  []*services.Service
 	log      *logger.Logger
@ -57,7 +76,6 @@ type MuxServerManager struct {
 func NewMuxServerManager() services.Service {
 	return &MuxServerManager{
 		cfg:      MuxServerArgs{},
-		udpChn:   make(chan MuxUDPItem, 50000),
 		serverID: utils.Uniqueid(),
 		servers:  []*services.Service{},
 	}
@ -121,6 +139,11 @@ func (s *MuxServerManager) Start(args interface{}, log *logger.Logger) (err erro
 			SessionCount: s.cfg.SessionCount,
 			KCP:          s.cfg.KCP,
 			ParentType:   s.cfg.ParentType,
+			Jumper:       s.cfg.Jumper,
+			TCPSMethod:   s.cfg.TCPSMethod,
+			TCPSPassword: s.cfg.TCPSPassword,
+			TOUMethod:    s.cfg.TOUMethod,
+			TOUPassword:  s.cfg.TOUPassword,
 		}, log)

 		if err != nil {
@ -137,6 +160,11 @@ func (s *MuxServerManager) StopService() {
 	for _, server := range s.servers {
 		(*server).Clean()
 	}
+	s.cfg = MuxServerArgs{}
+	s.log = nil
+	s.serverID = ""
+	s.servers = nil
+	s = nil
 }
 func (s *MuxServerManager) CheckArgs() (err error) {
 	if *s.cfg.CertFile == "" || *s.cfg.KeyFile == "" {
@ -155,27 +183,24 @@ func (s *MuxServerManager) InitService() (err error) {
 	return
 }

-type MuxServer struct {
-	cfg      MuxServerArgs
-	udpChn   chan MuxUDPItem
-	sc       utils.ServerChannel
-	sessions utils.ConcurrentMap
-	lockChn  chan bool
-	isStop   bool
-	udpConn  *net.Conn
-	log      *logger.Logger
-}
-
 func NewMuxServer() services.Service {
 	return &MuxServer{
 		cfg:      MuxServerArgs{},
-		udpChn:   make(chan MuxUDPItem, 50000),
 		lockChn:  make(chan bool, 1),
-		sessions: utils.NewConcurrentMap(),
+		sessions: mapx.NewConcurrentMap(),
 		isStop:   false,
+		udpConns: mapx.NewConcurrentMap(),
 	}
 }

+type MuxUDPConnItem struct {
+	conn      *net.Conn
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	connid    string
+}
+
 func (s *MuxServer) StopService() {
 	defer func() {
 		e := recover()
@ -184,6 +209,14 @@ func (s *MuxServer) StopService() {
 		} else {
 			s.log.Printf("service server stoped")
 		}
+		s.cfg = MuxServerArgs{}
+		s.jumper = nil
+		s.lockChn = nil
+		s.log = nil
+		s.sc = server.ServerChannel{}
+		s.sessions = nil
+		s.udpConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	for _, sess := range s.sessions.Items() {
@ -195,12 +228,9 @@ func (s *MuxServer) StopService() {
 	if s.sc.UDPListener != nil {
 		(*s.sc.UDPListener).Close()
 	}
-	if s.udpConn != nil {
-		(*s.udpConn).Close()
-	}
 }
 func (s *MuxServer) InitService() (err error) {
-	s.UDPConnDeamon()
+	s.UDPGCDeamon()
 	return
 }
 func (s *MuxServer) CheckArgs() (err error) {
@ -208,6 +238,19 @@ func (s *MuxServer) CheckArgs() (err error) {
 		err = fmt.Errorf("remote required")
 		return
 	}
+	if *s.cfg.Jumper != "" {
+		if *s.cfg.ParentType != "tls" && *s.cfg.ParentType != "tcp" {
+			err = fmt.Errorf("jumper only worked of -T is tls or tcp")
+			return
+		}
+		var j jumper.Jumper
+		j, err = jumper.New(*s.cfg.Jumper, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err != nil {
+			err = fmt.Errorf("parse jumper fail, err %s", err)
+			return
+		}
+		s.jumper = &j
+	}
 	return
 }

@ -222,14 +265,10 @@ func (s *MuxServer) Start(args interface{}, log *logger.Logger) (err error) {
 	}
 	host, port, _ := net.SplitHostPort(*s.cfg.Local)
 	p, _ := strconv.Atoi(port)
-	s.sc = utils.NewServerChannel(host, p, s.log)
+	s.sc = server.NewServerChannel(host, p, s.log)
 	if *s.cfg.IsUDP {
-		err = s.sc.ListenUDP(func(packet []byte, localAddr, srcAddr *net.UDPAddr) {
-			s.udpChn <- MuxUDPItem{
-				packet:    &packet,
-				localAddr: localAddr,
-				srcAddr:   srcAddr,
-			}
+		err = s.sc.ListenUDP(func(listener *net.UDPConn, packet []byte, localAddr, srcAddr *net.UDPAddr) {
+			s.UDPSend(packet, localAddr, srcAddr)
 		})
 		if err != nil {
 			return
@ -263,10 +302,20 @@ func (s *MuxServer) Start(args interface{}, log *logger.Logger) (err error) {
 				die1 := make(chan bool, 1)
 				die2 := make(chan bool, 1)
 				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+						}
+					}()
 					io.Copy(inConn, snappy.NewReader(outConn))
 					die1 <- true
 				}()
 				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+						}
+					}()
 					io.Copy(snappy.NewWriter(outConn), inConn)
 					die2 <- true
 				}()
@ -300,7 +349,9 @@ func (s *MuxServer) GetOutConn() (outConn net.Conn, ID string, err error) {
 	}
 	outConn, err = s.GetConn(fmt.Sprintf("%d", i))
 	if err != nil {
-		s.log.Printf("connection err: %s", err)
+		if !strings.Contains(err.Error(), "can not connect at same time") {
+			s.log.Printf("connection err: %s", err)
+		}
 		return
 	}
 	remoteAddr := "tcp:" + *s.cfg.Remote
@ -355,6 +406,11 @@ func (s *MuxServer) GetConn(index string) (conn net.Conn, err error) {
 		s.sessions.Set(index, session)
 		s.log.Printf("session[%s] created", index)
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			for {
 				if s.isStop {
 					return
@ -378,99 +434,169 @@ func (s *MuxServer) GetConn(index string) (conn net.Conn, err error) {
 }
 func (s *MuxServer) getParentConn() (conn net.Conn, err error) {
 	if *s.cfg.ParentType == "tls" {
-		var _conn tls.Conn
-		_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
-		if err == nil {
-			conn = net.Conn(&_conn)
+		if s.jumper == nil {
+			var _conn tls.Conn
+			_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err == nil {
+				conn = net.Conn(&_conn)
+			}
+		} else {
+			conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err != nil {
+				return nil, err
+			}
+			var _c net.Conn
+			_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+			if err == nil {
+				conn = net.Conn(tls.Client(_c, conf))
+			}
 		}
+
 	} else if *s.cfg.ParentType == "kcp" {
 		conn, err = utils.ConnectKCPHost(*s.cfg.Parent, s.cfg.KCP)
+	} else if *s.cfg.ParentType == "tcps" {
+		if s.jumper == nil {
+			conn, err = clienttransport.TCPSConnectHost(*s.cfg.Parent, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, *s.cfg.Timeout)
+		} else {
+			conn, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+			if err == nil {
+				conn, err = encryptconn.NewConn(conn, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword)
+			}
+		}
+
+	} else if *s.cfg.ParentType == "tou" {
+		conn, err = clienttransport.TOUConnectHost(*s.cfg.Parent, *s.cfg.TCPSMethod, *s.cfg.TCPSPassword, false, *s.cfg.Timeout)
 	} else {
-		conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
+		if s.jumper == nil {
+			conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
+		} else {
+			conn, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		}
 	}
 	return
 }
-func (s *MuxServer) UDPConnDeamon() {
+func (s *MuxServer) UDPGCDeamon() {
+	gctime := int64(30)
 	go func() {
 		defer func() {
-			if err := recover(); err != nil {
-				s.log.Printf("udp conn deamon crashed with err : %s \nstack: %s", err, string(debug.Stack()))
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
 			}
 		}()
-		var outConn net.Conn
-		var ID string
-		var err error
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
 		for {
-			if s.isStop {
-				return
-			}
-			item := <-s.udpChn
-		RETRY:
-			if s.isStop {
-				return
-			}
-			if outConn == nil {
-				for {
-					if s.isStop {
-						return
-					}
-					outConn, ID, err = s.GetOutConn()
-					if err != nil {
-						outConn = nil
-						utils.CloseConn(&outConn)
-						s.log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, err)
-						time.Sleep(time.Second * 3)
-						continue
-					} else {
-						go func(outConn net.Conn, ID string) {
-							if s.udpConn != nil {
-								(*s.udpConn).Close()
-							}
-							s.udpConn = &outConn
-							for {
-								if s.isStop {
-									return
-								}
-								outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-								srcAddrFromConn, body, err := utils.ReadUDPPacket(outConn)
-								outConn.SetDeadline(time.Time{})
-								if err != nil {
-									s.log.Printf("parse revecived udp packet fail, err: %s ,%v", err, body)
-									s.log.Printf("UDP deamon connection %s exited", ID)
-									break
-								}
-								//s.log.Printf("udp packet revecived over parent , local:%s", srcAddrFromConn)
-								_srcAddr := strings.Split(srcAddrFromConn, ":")
-								if len(_srcAddr) != 2 {
-									s.log.Printf("parse revecived udp packet fail, addr error : %s", srcAddrFromConn)
-									continue
-								}
-								port, _ := strconv.Atoi(_srcAddr[1])
-								dstAddr := &net.UDPAddr{IP: net.ParseIP(_srcAddr[0]), Port: port}
-								s.sc.UDPListener.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-								_, err = s.sc.UDPListener.WriteToUDP(body, dstAddr)
-								s.sc.UDPListener.SetDeadline(time.Time{})
-								if err != nil {
-									s.log.Printf("udp response to local %s fail,ERR:%s", srcAddrFromConn, err)
-									continue
-								}
-								//s.log.Printf("udp response to local %s success , %v", srcAddrFromConn, body)
-							}
-						}(outConn, ID)
-						break
-					}
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*MuxUDPConnItem).touchtime > gctime {
+					(*(v.(*MuxUDPConnItem).conn)).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", v.(*MuxUDPConnItem).connid)
 				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
 			}
-			outConn.SetWriteDeadline(time.Now().Add(time.Second))
-			_, err = outConn.Write(utils.UDPPacket(item.srcAddr.String(), *item.packet))
-			outConn.SetWriteDeadline(time.Time{})
-			if err != nil {
-				utils.CloseConn(&outConn)
-				outConn = nil
-				s.log.Printf("write udp packet to %s fail ,flush err:%s ,retrying...", *s.cfg.Parent, err)
-				goto RETRY
-			}
-			//s.log.Printf("write packet %v", *item.packet)
+			gcKeys = nil
+		}
+	}()
+}
+func (s *MuxServer) UDPSend(data []byte, localAddr, srcAddr *net.UDPAddr) {
+	var (
+		uc      *MuxUDPConnItem
+		key     = srcAddr.String()
+		ID      string
+		err     error
+		outconn net.Conn
+	)
+	v, ok := s.udpConns.Get(key)
+	if !ok {
+		for {
+			outconn, ID, err = s.GetOutConn()
+			if err != nil && strings.Contains(err.Error(), "can not connect at same time") {
+				time.Sleep(time.Millisecond * 500)
+				continue
+			} else {
+				break
+			}
+		}
+		if err != nil {
+			s.log.Printf("connect to %s fail, err: %s", *s.cfg.Parent, err)
+			return
+		}
+		uc = &MuxUDPConnItem{
+			conn:      &outconn,
+			srcAddr:   srcAddr,
+			localAddr: localAddr,
+			connid:    ID,
+		}
+		s.udpConns.Set(key, uc)
+		s.UDPRevecive(key, ID)
+	} else {
+		uc = v.(*MuxUDPConnItem)
+	}
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				(*uc.conn).Close()
+				s.udpConns.Remove(key)
+				s.log.Printf("udp sender crashed with error : %s", e)
+			}
+		}()
+		uc.touchtime = time.Now().Unix()
+		(*uc.conn).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+		_, err = (*uc.conn).Write(utils.UDPPacket(srcAddr.String(), data))
+		(*uc.conn).SetWriteDeadline(time.Time{})
+		if err != nil {
+			s.log.Printf("write udp packet to %s fail ,flush err:%s ", *s.cfg.Parent, err)
+		}
+	}()
+}
+func (s *MuxServer) UDPRevecive(key, ID string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", ID)
+		var uc *MuxUDPConnItem
+		defer func() {
+			if uc != nil {
+				(*uc.conn).Close()
+			}
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", ID)
+		}()
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s, connid : %s", key, ID)
+			return
+		}
+		uc = v.(*MuxUDPConnItem)
+		for {
+			_, body, err := utils.ReadUDPPacket(*uc.conn)
+			if err != nil {
+				if strings.Contains(err.Error(), "n != int(") {
+					continue
+				}
+				if err != io.EOF {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			uc.touchtime = time.Now().Unix()
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+					}
+				}()
+				s.sc.UDPListener.WriteToUDP(body, uc.srcAddr)
+			}()
 		}
 	}()
 }
--- a/services/service.go
+++ b/services/service.go
@ -4,6 +4,7 @@ import (
 	"fmt"
 	logger "log"
 	"runtime/debug"
+	"sync"
 )

 type Service interface {
@ -17,31 +18,32 @@ type ServiceItem struct {
 	Log  *logger.Logger
 }

-var servicesMap = map[string]*ServiceItem{}
+var servicesMap = sync.Map{}

 func Regist(name string, s Service, args interface{}, log *logger.Logger) {
 	Stop(name)
-	servicesMap[name] = &ServiceItem{
+	servicesMap.Store(name, &ServiceItem{
 		S:    s,
 		Args: args,
 		Name: name,
 		Log:  log,
-	}
+	})
 }
 func GetService(name string) *ServiceItem {
-	if s, ok := servicesMap[name]; ok && s.S != nil {
-		return s
+	if s, ok := servicesMap.Load(name); ok && s.(*ServiceItem).S != nil {
+		return s.(*ServiceItem)
 	}
 	return nil

 }
 func Stop(name string) {
-	if s, ok := servicesMap[name]; ok && s.S != nil {
-		s.S.Clean()
+	if s, ok := servicesMap.Load(name); ok && s.(*ServiceItem).S != nil {
+		s.(*ServiceItem).S.Clean()
+		servicesMap.Delete(name)
 	}
 }
 func Run(name string, args interface{}) (service *ServiceItem, err error) {
-	service, ok := servicesMap[name]
+	_service, ok := servicesMap.Load(name)
 	if ok {
 		defer func() {
 			e := recover()
@ -49,6 +51,7 @@ func Run(name string, args interface{}) (service *ServiceItem, err error) {
 				err = fmt.Errorf("%s servcie crashed, ERR: %s\ntrace:%s", name, e, string(debug.Stack()))
 			}
 		}()
+		service = _service.(*ServiceItem)
 		if args != nil {
 			err = service.S.Start(args, service.Log)
 		} else {
--- a/services/socks/socks.go
+++ b/services/socks/socks.go
@ -8,53 +8,72 @@ import (
 	logger "log"
 	"net"
 	"runtime/debug"
+	"strconv"
 	"strings"
 	"time"

+	server "github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
 	"github.com/snail007/goproxy/utils/conncrypt"
+	"github.com/snail007/goproxy/utils/datasize"
+	"github.com/snail007/goproxy/utils/dnsx"
+	"github.com/snail007/goproxy/utils/iolimiter"
+	"github.com/snail007/goproxy/utils/lb"
+	"github.com/snail007/goproxy/utils/mapx"
 	"github.com/snail007/goproxy/utils/socks"
+
 	"golang.org/x/crypto/ssh"
 )

 type SocksArgs struct {
-	Parent         *string
-	ParentType     *string
-	Local          *string
-	LocalType      *string
-	CertFile       *string
-	KeyFile        *string
-	CaCertFile     *string
-	CaCertBytes    []byte
-	CertBytes      []byte
-	KeyBytes       []byte
-	SSHKeyFile     *string
-	SSHKeyFileSalt *string
-	SSHPassword    *string
-	SSHUser        *string
-	SSHKeyBytes    []byte
-	SSHAuthMethod  ssh.AuthMethod
-	Timeout        *int
-	Always         *bool
-	Interval       *int
-	Blocked        *string
-	Direct         *string
-	AuthFile       *string
-	Auth           *[]string
-	AuthURL        *string
-	AuthURLOkCode  *int
-	AuthURLTimeout *int
-	AuthURLRetry   *int
-	KCP            kcpcfg.KCPConfigArgs
-	LocalIPS       *[]string
-	DNSAddress     *string
-	DNSTTL         *int
-	LocalKey       *string
-	ParentKey      *string
-	LocalCompress  *bool
-	ParentCompress *bool
+	Parent                *[]string
+	ParentType            *string
+	Local                 *string
+	LocalType             *string
+	CertFile              *string
+	KeyFile               *string
+	CaCertFile            *string
+	CaCertBytes           []byte
+	CertBytes             []byte
+	KeyBytes              []byte
+	SSHKeyFile            *string
+	SSHKeyFileSalt        *string
+	SSHPassword           *string
+	SSHUser               *string
+	SSHKeyBytes           []byte
+	SSHAuthMethod         ssh.AuthMethod
+	Timeout               *int
+	Always                *bool
+	Interval              *int
+	Blocked               *string
+	Direct                *string
+	ParentAuth            *string
+	AuthFile              *string
+	Auth                  *[]string
+	AuthURL               *string
+	AuthURLOkCode         *int
+	AuthURLTimeout        *int
+	AuthURLRetry          *int
+	KCP                   kcpcfg.KCPConfigArgs
+	LocalIPS              *[]string
+	DNSAddress            *string
+	DNSTTL                *int
+	LocalKey              *string
+	ParentKey             *string
+	LocalCompress         *bool
+	ParentCompress        *bool
+	LoadBalanceMethod     *string
+	LoadBalanceTimeout    *int
+	LoadBalanceRetryTime  *int
+	LoadBalanceHashTarget *bool
+	LoadBalanceOnlyHA     *bool
+
+	RateLimit      *string
+	RateLimitBytes float64
+	BindListen     *bool
+	Debug          *bool
 }
 type Socks struct {
 	cfg                   SocksArgs
@ -62,13 +81,14 @@ type Socks struct {
 	basicAuth             utils.BasicAuth
 	sshClient             *ssh.Client
 	lockChn               chan bool
-	udpSC                 utils.ServerChannel
-	sc                    *utils.ServerChannel
-	domainResolver        utils.DomainResolver
+	udpSC                 server.ServerChannel
+	sc                    *server.ServerChannel
+	domainResolver        dnsx.DomainResolver
 	isStop                bool
-	userConns             utils.ConcurrentMap
+	userConns             mapx.ConcurrentMap
 	log                   *logger.Logger
-	udpRelatedPacketConns utils.ConcurrentMap
+	lb                    *lb.Group
+	udpRelatedPacketConns mapx.ConcurrentMap
 	udpLocalKey           []byte
 	udpParentKey          []byte
 }
@ -80,14 +100,14 @@ func NewSocks() services.Service {
 		basicAuth:             utils.BasicAuth{},
 		lockChn:               make(chan bool, 1),
 		isStop:                false,
-		userConns:             utils.NewConcurrentMap(),
-		udpRelatedPacketConns: utils.NewConcurrentMap(),
+		userConns:             mapx.NewConcurrentMap(),
+		udpRelatedPacketConns: mapx.NewConcurrentMap(),
 	}
 }

 func (s *Socks) CheckArgs() (err error) {

-	if *s.cfg.LocalType == "tls" || (*s.cfg.Parent != "" && *s.cfg.ParentType == "tls") {
+	if *s.cfg.LocalType == "tls" || (len(*s.cfg.Parent) > 0 && *s.cfg.ParentType == "tls") {
 		s.cfg.CertBytes, s.cfg.KeyBytes, err = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
 		if err != nil {
 			return
@ -100,7 +120,12 @@ func (s *Socks) CheckArgs() (err error) {
 			}
 		}
 	}
-	if *s.cfg.Parent != "" {
+
+	if len(*s.cfg.Parent) == 1 && (*s.cfg.Parent)[0] == "" {
+		(*s.cfg.Parent) = []string{}
+	}
+
+	if len(*s.cfg.Parent) > 0 {
 		if *s.cfg.ParentType == "" {
 			err = fmt.Errorf("parent type unkown,use -T <tls|tcp|ssh|kcp>")
 			return
@ -136,30 +161,46 @@ func (s *Socks) CheckArgs() (err error) {
 			}
 		}
 	}
+	if *s.cfg.RateLimit != "0" && *s.cfg.RateLimit != "" {
+		var size uint64
+		size, err = datasize.Parse(*s.cfg.RateLimit)
+		if err != nil {
+			err = fmt.Errorf("parse rate limit size error,ERR:%s", err)
+			return
+		}
+		s.cfg.RateLimitBytes = float64(size)
+	}
 	s.udpLocalKey = s.LocalUDPKey()
 	s.udpParentKey = s.ParentUDPKey()
-	//s.log.Printf("udpLocalKey : %v , udpParentKey : %v", s.udpLocalKey, s.udpParentKey)
 	return
 }
 func (s *Socks) InitService() (err error) {
 	s.InitBasicAuth()
 	if *s.cfg.DNSAddress != "" {
-		(*s).domainResolver = utils.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
+		(*s).domainResolver = dnsx.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
+	}
+	if len(*s.cfg.Parent) > 0 {
+		s.checker = utils.NewChecker(*s.cfg.Timeout, int64(*s.cfg.Interval), *s.cfg.Blocked, *s.cfg.Direct, s.log)
+		s.InitLB()
 	}
-	s.checker = utils.NewChecker(*s.cfg.Timeout, int64(*s.cfg.Interval), *s.cfg.Blocked, *s.cfg.Direct, s.log)
 	if *s.cfg.ParentType == "ssh" {
-		e := s.ConnectSSH()
+		e := s.ConnectSSH(s.Resolve(s.lb.Select("", *s.cfg.LoadBalanceOnlyHA)))
 		if e != nil {
 			err = fmt.Errorf("init service fail, ERR: %s", e)
 			return
 		}
 		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+				}
+			}()
 			//循环检查ssh网络连通性
 			for {
 				if s.isStop {
 					return
 				}
-				conn, err := utils.ConnectHost(s.Resolve(*s.cfg.Parent), *s.cfg.Timeout*2)
+				conn, err := utils.ConnectHost(s.Resolve(s.lb.Select("", *s.cfg.LoadBalanceOnlyHA)), *s.cfg.Timeout*2)
 				if err == nil {
 					conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
 					_, err = conn.Write([]byte{0})
@ -170,7 +211,7 @@ func (s *Socks) InitService() (err error) {
 						s.sshClient.Close()
 					}
 					s.log.Printf("ssh offline, retrying...")
-					s.ConnectSSH()
+					s.ConnectSSH(s.Resolve(s.lb.Select("", *s.cfg.LoadBalanceOnlyHA)))
 				} else {
 					conn.Close()
 				}
@ -191,9 +232,26 @@ func (s *Socks) StopService() {
 		} else {
 			s.log.Printf("service socks stoped")
 		}
+		s.basicAuth = utils.BasicAuth{}
+		s.cfg = SocksArgs{}
+		s.checker = utils.Checker{}
+		s.domainResolver = dnsx.DomainResolver{}
+		s.lb = nil
+		s.lockChn = nil
+		s.log = nil
+		s.sc = nil
+		s.sshClient = nil
+		s.udpLocalKey = nil
+		s.udpParentKey = nil
+		s.udpRelatedPacketConns = nil
+		s.udpSC = server.ServerChannel{}
+		s.userConns = nil
+		s = nil
 	}()
 	s.isStop = true
-	s.checker.Stop()
+	if len(*s.cfg.Parent) > 0 {
+		s.checker.Stop()
+	}
 	if s.sshClient != nil {
 		s.sshClient.Close()
 	}
@ -206,6 +264,9 @@ func (s *Socks) StopService() {
 	for _, c := range s.userConns.Items() {
 		(*c.(*net.Conn)).Close()
 	}
+	if s.lb != nil {
+		s.lb.Stop()
+	}
 	for _, c := range s.udpRelatedPacketConns.Items() {
 		(*c.(*net.UDPConn)).Close()
 	}
@ -220,14 +281,14 @@ func (s *Socks) Start(args interface{}, log *logger.Logger) (err error) {
 	if err = s.InitService(); err != nil {
 		s.InitService()
 	}
-	if *s.cfg.Parent != "" {
-		s.log.Printf("use %s parent %s", *s.cfg.ParentType, *s.cfg.Parent)
+	if len(*s.cfg.Parent) > 0 {
+		s.log.Printf("use %s parent %v [ %s ]", *s.cfg.ParentType, *s.cfg.Parent, strings.ToUpper(*s.cfg.LoadBalanceMethod))
 	}
-	sc := utils.NewServerChannelHost(*s.cfg.Local, s.log)
+	sc := server.NewServerChannelHost(*s.cfg.Local, s.log)
 	if *s.cfg.LocalType == "tcp" {
 		err = sc.ListenTCP(s.socksConnCallback)
 	} else if *s.cfg.LocalType == "tls" {
-		err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.socksConnCallback)
+		err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes, s.socksConnCallback)
 	} else if *s.cfg.LocalType == "kcp" {
 		err = sc.ListenKCP(s.cfg.KCP, s.socksConnCallback, s.log)
 	}
@ -257,116 +318,40 @@ func (s *Socks) socksConnCallback(inConn net.Conn) {
 			Password: *s.cfg.LocalKey,
 		})
 	}
-	//协商开始

-	//method select request
-	inConn.SetReadDeadline(time.Now().Add(time.Second * 3))
-	methodReq, err := socks.NewMethodsRequest(inConn)
-	inConn.SetReadDeadline(time.Time{})
-	if err != nil {
-		methodReq.Reply(socks.Method_NONE_ACCEPTABLE)
-		utils.CloseConn(&inConn)
-		if err != io.EOF {
-			s.log.Printf("new methods request fail,ERR: %s", err)
-		}
-		return
-	}
-
-	if !s.IsBasicAuth() {
-		if !methodReq.Select(socks.Method_NO_AUTH) {
-			methodReq.Reply(socks.Method_NONE_ACCEPTABLE)
-			utils.CloseConn(&inConn)
-			s.log.Printf("none method found : Method_NO_AUTH")
-			return
-		}
-		//method select reply
-		err = methodReq.Reply(socks.Method_NO_AUTH)
-		if err != nil {
-			s.log.Printf("reply answer data fail,ERR: %s", err)
-			utils.CloseConn(&inConn)
-			return
-		}
-		// s.log.Printf("% x", methodReq.Bytes())
+	//socks5 server
+	var serverConn *socks.ServerConn
+	udpIP, _, _ := net.SplitHostPort(inConn.LocalAddr().String())
+	if s.IsBasicAuth() {
+		serverConn = socks.NewServerConn(&inConn, time.Millisecond*time.Duration(*s.cfg.Timeout), &s.basicAuth, true, udpIP, nil)
 	} else {
-		//auth
-		if !methodReq.Select(socks.Method_USER_PASS) {
-			methodReq.Reply(socks.Method_NONE_ACCEPTABLE)
-			utils.CloseConn(&inConn)
-			s.log.Printf("none method found : Method_USER_PASS")
-			return
-		}
-		//method reply need auth
-		err = methodReq.Reply(socks.Method_USER_PASS)
-		if err != nil {
-			s.log.Printf("reply answer data fail,ERR: %s", err)
-			utils.CloseConn(&inConn)
-			return
-		}
-		//read auth
-		buf := make([]byte, 500)
-		inConn.SetReadDeadline(time.Now().Add(time.Second * 3))
-		n, err := inConn.Read(buf)
-		inConn.SetReadDeadline(time.Time{})
-		if err != nil {
-			utils.CloseConn(&inConn)
-			return
-		}
-		r := buf[:n]
-		user := string(r[2 : r[1]+2])
-		pass := string(r[2+r[1]+1:])
-		//s.log.Printf("user:%s,pass:%s", user, pass)
-		//auth
-		_addr := strings.Split(inConn.RemoteAddr().String(), ":")
-		if s.basicAuth.CheckUserPass(user, pass, _addr[0], "") {
-			inConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-			inConn.Write([]byte{0x01, 0x00})
-			inConn.SetDeadline(time.Time{})
-
-		} else {
-			inConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-			inConn.Write([]byte{0x01, 0x01})
-			inConn.SetDeadline(time.Time{})
-
-			utils.CloseConn(&inConn)
-			return
-		}
+		serverConn = socks.NewServerConn(&inConn, time.Millisecond*time.Duration(*s.cfg.Timeout), nil, true, udpIP, nil)
 	}
-
-	//request detail
-	request, err := socks.NewRequest(inConn)
-	if err != nil {
-		s.log.Printf("read request data fail,ERR: %s", err)
-		utils.CloseConn(&inConn)
+	if err := serverConn.Handshake(); err != nil {
+		if !strings.HasSuffix(err.Error(), "EOF") {
+			s.log.Printf("handshake fail, ERR: %s", err)
+		}
+		inConn.Close()
 		return
 	}
-	//协商结束
-
-	switch request.CMD() {
-	case socks.CMD_BIND:
-		//bind 不支持
-		request.TCPReply(socks.REP_UNKNOWN)
-		utils.CloseConn(&inConn)
-		return
-	case socks.CMD_CONNECT:
-		//tcp
-		s.proxyTCP(&inConn, methodReq, request)
-	case socks.CMD_ASSOCIATE:
-		//udp
-		s.proxyUDP(&inConn, methodReq, request)
+	if serverConn.IsUDP() {
+		s.proxyUDP(&inConn, serverConn)
+	} else if serverConn.IsTCP() {
+		s.proxyTCP(&inConn, serverConn)
 	}
-
 }

-func (s *Socks) proxyTCP(inConn *net.Conn, methodReq socks.MethodsRequest, request socks.Request) {
+func (s *Socks) proxyTCP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	var outConn net.Conn
 	var err interface{}
+	lbAddr := ""
 	useProxy := true
 	tryCount := 0
 	maxTryCount := 5
 	//防止死循环
-	if s.IsDeadLoop((*inConn).LocalAddr().String(), request.Host()) {
+	if s.IsDeadLoop((*inConn).LocalAddr().String(), serverConn.Host()) {
 		utils.CloseConn(inConn)
-		s.log.Printf("dead loop detected , %s", request.Host())
+		s.log.Printf("dead loop detected , %s", serverConn.Host())
 		utils.CloseConn(inConn)
 		return
 	}
@ -374,33 +359,70 @@ func (s *Socks) proxyTCP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 		if s.isStop {
 			return
 		}
+
 		if *s.cfg.Always {
-			outConn, err = s.getOutConn(methodReq.Bytes(), request.Bytes(), request.Addr(), true)
+			selectAddr := (*inConn).RemoteAddr().String()
+			if utils.LBMethod(*s.cfg.LoadBalanceMethod) == lb.SELECT_HASH && *s.cfg.LoadBalanceHashTarget {
+				selectAddr = serverConn.Target()
+			}
+			lbAddr = s.lb.Select(selectAddr, *s.cfg.LoadBalanceOnlyHA)
+			//lbAddr = s.lb.Select((*inConn).RemoteAddr().String())
+			outConn, err = s.GetParentConn(lbAddr, serverConn)
+			if err != nil {
+				s.log.Printf("connect to parent fail, %s", err)
+				return
+			}
+			//handshake
+			//socks client
+			_, err = s.HandshakeSocksParent(&outConn, "tcp", serverConn.Target(), serverConn.AuthData(), false)
+			if err != nil {
+				if err != io.EOF {
+					s.log.Printf("handshake fail, %s", err)
+				}
+				return
+			}
 		} else {
-			if *s.cfg.Parent != "" {
-				host, _, _ := net.SplitHostPort(request.Addr())
+			if len(*s.cfg.Parent) > 0 {
+				host, _, _ := net.SplitHostPort(serverConn.Target())
 				useProxy := false
-				if utils.IsIternalIP(host, *s.cfg.Always) {
+				if utils.IsInternalIP(host, *s.cfg.Always) {
 					useProxy = false
 				} else {
 					var isInMap bool
-					useProxy, isInMap, _, _ = s.checker.IsBlocked(request.Addr())
+					useProxy, isInMap, _, _ = s.checker.IsBlocked(serverConn.Target())
 					if !isInMap {
-						s.checker.Add(request.Addr(), s.Resolve(request.Addr()))
+						s.checker.Add(serverConn.Target(), s.Resolve(serverConn.Target()))
 					}
 				}
 				if useProxy {
-					outConn, err = s.getOutConn(methodReq.Bytes(), request.Bytes(), request.Addr(), true)
+					selectAddr := (*inConn).RemoteAddr().String()
+					if utils.LBMethod(*s.cfg.LoadBalanceMethod) == lb.SELECT_HASH && *s.cfg.LoadBalanceHashTarget {
+						selectAddr = serverConn.Target()
+					}
+					lbAddr = s.lb.Select(selectAddr, *s.cfg.LoadBalanceOnlyHA)
+					//lbAddr = s.lb.Select((*inConn).RemoteAddr().String())
+					outConn, err = s.GetParentConn(lbAddr, serverConn)
+					if err != nil {
+						s.log.Printf("connect to parent fail, %s", err)
+						return
+					}
+					//handshake
+					//socks client
+					_, err = s.HandshakeSocksParent(&outConn, "tcp", serverConn.Target(), serverConn.AuthData(), false)
+					if err != nil {
+						s.log.Printf("handshake fail, %s", err)
+						return
+					}
 				} else {
-					outConn, err = utils.ConnectHost(s.Resolve(request.Addr()), *s.cfg.Timeout)
+					outConn, err = s.GetDirectConn(s.Resolve(serverConn.Target()), (*inConn).LocalAddr().String())
 				}
 			} else {
-				outConn, err = utils.ConnectHost(s.Resolve(request.Addr()), *s.cfg.Timeout)
+				outConn, err = s.GetDirectConn(s.Resolve(serverConn.Target()), (*inConn).LocalAddr().String())
 				useProxy = false
 			}
 		}
 		tryCount++
-		if err == nil || tryCount > maxTryCount || *s.cfg.Parent == "" {
+		if err == nil || tryCount > maxTryCount || len(*s.cfg.Parent) == 0 {
 			break
 		} else {
 			s.log.Printf("get out conn fail,%s,retrying...", err)
@ -409,42 +431,49 @@ func (s *Socks) proxyTCP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 	}
 	if err != nil {
 		s.log.Printf("get out conn fail,%s", err)
-		request.TCPReply(socks.REP_NETWOR_UNREACHABLE)
 		return
 	}

-	s.log.Printf("use proxy %v : %s", useProxy, request.Addr())
+	s.log.Printf("use proxy %v : %s", useProxy, serverConn.Target())

-	request.TCPReply(socks.REP_SUCCESS)
 	inAddr := (*inConn).RemoteAddr().String()
+	//outRemoteAddr := outConn.RemoteAddr().String()
 	//inLocalAddr := (*inConn).LocalAddr().String()

-	s.log.Printf("conn %s - %s connected", inAddr, request.Addr())
+	if s.cfg.RateLimitBytes > 0 {
+		outConn = iolimiter.NewReaderConn(outConn, s.cfg.RateLimitBytes)
+	}
+
 	utils.IoBind(*inConn, outConn, func(err interface{}) {
-		s.log.Printf("conn %s - %s released", inAddr, request.Addr())
+		s.log.Printf("conn %s - %s released", inAddr, serverConn.Target())
 		s.userConns.Remove(inAddr)
+		if len(*s.cfg.Parent) > 0 {
+			s.lb.DecreaseConns(lbAddr)
+		}
 	}, s.log)
 	if c, ok := s.userConns.Get(inAddr); ok {
 		(*c.(*net.Conn)).Close()
 		s.userConns.Remove(inAddr)
 	}
 	s.userConns.Set(inAddr, inConn)
+	if len(*s.cfg.Parent) > 0 {
+		s.lb.IncreasConns(lbAddr)
+	}
+	s.log.Printf("conn %s - %s connected", inAddr, serverConn.Target())
 }
-func (s *Socks) getOutConn(methodBytes, reqBytes []byte, host string, handshake bool) (outConn net.Conn, err interface{}) {
+func (s *Socks) GetParentConn(parentAddress string, serverConn *socks.ServerConn) (outConn net.Conn, err interface{}) {
 	switch *s.cfg.ParentType {
-	case "kcp":
-		fallthrough
-	case "tls":
-		fallthrough
-	case "tcp":
+	case "kcp", "tls", "tcp":
 		if *s.cfg.ParentType == "tls" {
-			var _outConn tls.Conn
-			_outConn, err = utils.TlsConnectHost(s.Resolve(*s.cfg.Parent), *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
-			outConn = net.Conn(&_outConn)
+			var _conn tls.Conn
+			_conn, err = utils.TlsConnectHost(parentAddress, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes)
+			if err == nil {
+				outConn = net.Conn(&_conn)
+			}
 		} else if *s.cfg.ParentType == "kcp" {
-			outConn, err = utils.ConnectKCPHost(s.Resolve(*s.cfg.Parent), s.cfg.KCP)
+			outConn, err = utils.ConnectKCPHost(parentAddress, s.cfg.KCP)
 		} else {
-			outConn, err = utils.ConnectHost(s.Resolve(*s.cfg.Parent), *s.cfg.Timeout)
+			outConn, err = utils.ConnectHost(parentAddress, *s.cfg.Timeout)
 		}
 		if err != nil {
 			err = fmt.Errorf("connect fail,%s", err)
@ -458,44 +487,6 @@ func (s *Socks) getOutConn(methodBytes, reqBytes []byte, host string, handshake
 				Password: *s.cfg.ParentKey,
 			})
 		}
-		if !handshake {
-			return
-		}
-		var buf = make([]byte, 1024)
-		//var n int
-		outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		_, err = outConn.Write(methodBytes)
-		outConn.SetDeadline(time.Time{})
-		if err != nil {
-			err = fmt.Errorf("write method fail,%s", err)
-			return
-		}
-		outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		_, err = outConn.Read(buf)
-		outConn.SetDeadline(time.Time{})
-		if err != nil {
-			err = fmt.Errorf("read method reply fail,%s", err)
-			return
-		}
-		//resp := buf[:n]
-		//s.log.Printf("resp:%v", resp)
-		outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		_, err = outConn.Write(reqBytes)
-		outConn.SetDeadline(time.Time{})
-		if err != nil {
-			err = fmt.Errorf("write req detail fail,%s", err)
-			return
-		}
-		outConn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		_, err = outConn.Read(buf)
-		outConn.SetDeadline(time.Time{})
-		if err != nil {
-			err = fmt.Errorf("read req reply fail,%s", err)
-			return
-		}
-		//result := buf[:n]
-		//s.log.Printf("result:%v", result)
-
 	case "ssh":
 		maxTryCount := 1
 		tryCount := 0
@ -511,17 +502,17 @@ func (s *Socks) getOutConn(methodBytes, reqBytes []byte, host string, handshake
 				}
 				wait <- true
 			}()
-			outConn, err = s.sshClient.Dial("tcp", host)
+			outConn, err = s.sshClient.Dial("tcp", serverConn.Target())
 		}()
 		select {
 		case <-wait:
 		case <-time.After(time.Millisecond * time.Duration(*s.cfg.Timeout) * 2):
-			err = fmt.Errorf("ssh dial %s timeout", host)
+			err = fmt.Errorf("ssh dial %s timeout", serverConn.Target())
 			s.sshClient.Close()
 		}
 		if err != nil {
 			s.log.Printf("connect ssh fail, ERR: %s, retrying...", err)
-			e := s.ConnectSSH()
+			e := s.ConnectSSH(parentAddress)
 			if e == nil {
 				tryCount++
 				time.Sleep(time.Second * 3)
@ -534,7 +525,7 @@ func (s *Socks) getOutConn(methodBytes, reqBytes []byte, host string, handshake

 	return
 }
-func (s *Socks) ConnectSSH() (err error) {
+func (s *Socks) ConnectSSH(lbAddr string) (err error) {
 	select {
 	case s.lockChn <- true:
 	default:
@ -552,7 +543,7 @@ func (s *Socks) ConnectSSH() (err error) {
 	if s.sshClient != nil {
 		s.sshClient.Close()
 	}
-	s.sshClient, err = ssh.Dial("tcp", s.Resolve(*s.cfg.Parent), &config)
+	s.sshClient, err = ssh.Dial("tcp", s.Resolve(lbAddr), &config)
 	<-s.lockChn
 	return
 }
@ -581,6 +572,27 @@ func (s *Socks) InitBasicAuth() (err error) {
 	}
 	return
 }
+func (s *Socks) InitLB() {
+	configs := lb.BackendsConfig{}
+	for _, addr := range *s.cfg.Parent {
+		_addrInfo := strings.Split(addr, "@")
+		_addr := _addrInfo[0]
+		weight := 1
+		if len(_addrInfo) == 2 {
+			weight, _ = strconv.Atoi(_addrInfo[1])
+		}
+		configs = append(configs, &lb.BackendConfig{
+			Address:       _addr,
+			Weight:        weight,
+			ActiveAfter:   1,
+			InactiveAfter: 2,
+			Timeout:       time.Duration(*s.cfg.LoadBalanceTimeout) * time.Millisecond,
+			RetryTime:     time.Duration(*s.cfg.LoadBalanceRetryTime) * time.Millisecond,
+		})
+	}
+	LB := lb.NewGroup(utils.LBMethod(*s.cfg.LoadBalanceMethod), configs, &s.domainResolver, s.log, *s.cfg.Debug)
+	s.lb = &LB
+}
 func (s *Socks) IsBasicAuth() bool {
 	return *s.cfg.AuthFile != "" || len(*s.cfg.Auth) > 0 || *s.cfg.AuthURL != ""
 }
@ -598,7 +610,7 @@ func (s *Socks) IsDeadLoop(inLocalAddr string, host string) bool {
 		if *s.cfg.DNSAddress != "" {
 			outIPs = []net.IP{net.ParseIP(s.Resolve(outDomain))}
 		} else {
-			outIPs, err = net.LookupIP(outDomain)
+			outIPs, err = utils.LookupIP(outDomain)
 		}
 		if err == nil {
 			for _, ip := range outIPs {
@ -634,3 +646,37 @@ func (s *Socks) Resolve(address string) string {
 	}
 	return ip
 }
+func (s *Socks) GetDirectConn(address string, localAddr string) (conn net.Conn, err error) {
+	if !*s.cfg.BindListen {
+		return utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	ip, _, _ := net.SplitHostPort(localAddr)
+	if utils.IsInternalIP(ip, false) {
+		return utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	local, _ := net.ResolveTCPAddr("tcp", ip+":0")
+	d := net.Dialer{
+		Timeout:   time.Millisecond * time.Duration(*s.cfg.Timeout),
+		LocalAddr: local,
+	}
+	conn, err = d.Dial("tcp", address)
+	return
+}
+func (s *Socks) HandshakeSocksParent(outconn *net.Conn, network, dstAddr string, auth socks.Auth, fromSS bool) (client *socks.ClientConn, err error) {
+	if *s.cfg.ParentAuth != "" {
+		a := strings.Split(*s.cfg.ParentAuth, ":")
+		if len(a) != 2 {
+			err = fmt.Errorf("parent auth data format error")
+			return
+		}
+		client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), &socks.Auth{User: a[0], Password: a[1]}, nil)
+	} else {
+		if !fromSS && !s.IsBasicAuth() && auth.Password != "" && auth.User != "" {
+			client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), &auth, nil)
+		} else {
+			client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), nil, nil)
+		}
+	}
+	err = client.Handshake()
+	return
+}
--- a/services/socks/udp.go
+++ b/services/socks/udp.go
@ -44,7 +44,7 @@ func (s *Socks) LocalUDPKey() (key []byte) {
 	}
 	return
 }
-func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, request socks.Request) {
+func (s *Socks) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	defer func() {
 		if e := recover(); e != nil {
 			s.log.Printf("udp local->out io copy crashed:\n%s\n%s", e, string(debug.Stack()))
@ -54,23 +54,12 @@ func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 		utils.CloseConn(inConn)
 		return
 	}
-	srcIP, _, _ := net.SplitHostPort((*inConn).RemoteAddr().String())
 	inconnRemoteAddr := (*inConn).RemoteAddr().String()
 	localAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-	udpListener, err := net.ListenUDP("udp", localAddr)
-	if err != nil {
-		(*inConn).Close()
-		udpListener.Close()
-		s.log.Printf("udp bind fail , %s", err)
-		return
-	}
-	host, _, _ := net.SplitHostPort((*inConn).LocalAddr().String())
-	_, port, _ := net.SplitHostPort(udpListener.LocalAddr().String())
-	if len(*s.cfg.LocalIPS) > 0 {
-		host = (*s.cfg.LocalIPS)[0]
-	}
-	s.log.Printf("proxy udp on %s , for %s", net.JoinHostPort(host, port), inconnRemoteAddr)
-	request.UDPReply(socks.REP_SUCCESS, net.JoinHostPort(host, port))
+	udpListener := serverConn.UDPConnListener
+	srcIP, _, _ := net.SplitHostPort((*inConn).RemoteAddr().String())
+	s.log.Printf("proxy udp on %s , for %s", udpListener.LocalAddr(), inconnRemoteAddr)
+
 	s.userConns.Set(inconnRemoteAddr, inConn)
 	var (
 		outUDPConn       *net.UDPConn
@ -134,15 +123,15 @@ func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 		}
 	}()
 	useProxy := true
-	if *s.cfg.Parent != "" {
-		dstHost, _, _ := net.SplitHostPort(request.Addr())
-		if utils.IsIternalIP(dstHost, *s.cfg.Always) {
+	if len(*s.cfg.Parent) > 0 {
+		dstHost, _, _ := net.SplitHostPort(serverConn.Target())
+		if utils.IsInternalIP(dstHost, *s.cfg.Always) {
 			useProxy = false
 		} else {
 			var isInMap bool
-			useProxy, isInMap, _, _ = s.checker.IsBlocked(request.Addr())
+			useProxy, isInMap, _, _ = s.checker.IsBlocked(serverConn.Target())
 			if !isInMap {
-				s.checker.Add(request.Addr(), s.Resolve(request.Addr()))
+				s.checker.Add(serverConn.Target(), s.Resolve(serverConn.Target()))
 			}
 		}
 	} else {
@ -150,13 +139,17 @@ func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 	}
 	if useProxy {
 		//parent proxy
-		outconn, err := s.getOutConn(nil, nil, "", false)
+		lbAddr := s.lb.Select((*inConn).RemoteAddr().String(), *s.cfg.LoadBalanceOnlyHA)
+		outconn, err := s.GetParentConn(lbAddr, serverConn)
+		//outconn, err := s.GetParentConn(nil, nil, "", false)
 		if err != nil {
 			clean("connnect fail", fmt.Sprintf("%s", err))
 			return
 		}
-		client := socks.NewClientConn(&outconn, "udp", request.Addr(), time.Millisecond*time.Duration(*s.cfg.Timeout), nil, nil)
-		if err = client.Handshake(); err != nil {
+
+		client, err := s.HandshakeSocksParent(&outconn, "udp", serverConn.Target(), serverConn.AuthData(), false)
+
+		if err != nil {
 			clean("handshake fail", fmt.Sprintf("%s", err))
 			return
 		}
@ -179,7 +172,7 @@ func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 		//s.log.Printf("parent udp address %s", client.UDPAddr)
 		destAddr, _ = net.ResolveUDPAddr("udp", client.UDPAddr)
 	}
-	s.log.Printf("use proxy %v : udp %s", useProxy, request.Addr())
+	s.log.Printf("use proxy %v : udp %s", useProxy, serverConn.Target())
 	//relay
 	for {
 		buf := utils.LeakyBuffer.Get()
@ -245,6 +238,7 @@ func (s *Socks) proxyUDP(inConn *net.Conn, methodReq socks.MethodsRequest, reque
 						}
 						continue
 					}
+
 					//var dlen = n
 					if useProxy {
 						//forward to local
--- a/services/sps/socksudp.go
+++ b/services/sps/socksudp.go
@ -1,50 +1,17 @@
 package sps

 import (
-	"crypto/md5"
 	"fmt"
 	"net"
 	"runtime/debug"
-	"strconv"
 	"strings"
 	"time"

 	"github.com/snail007/goproxy/utils"
 	goaes "github.com/snail007/goproxy/utils/aes"
-	"github.com/snail007/goproxy/utils/conncrypt"
 	"github.com/snail007/goproxy/utils/socks"
 )

-func (s *SPS) ParentUDPKey() (key []byte) {
-	switch *s.cfg.ParentType {
-	case "tcp":
-		if *s.cfg.ParentKey != "" {
-			v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.ParentKey)))
-			return []byte(v)[:24]
-		}
-	case "tls":
-		return s.cfg.KeyBytes[:24]
-	case "kcp":
-		v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.KCP.Key)))
-		return []byte(v)[:24]
-	}
-	return
-}
-func (s *SPS) LocalUDPKey() (key []byte) {
-	switch *s.cfg.LocalType {
-	case "tcp":
-		if *s.cfg.LocalKey != "" {
-			v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.LocalKey)))
-			return []byte(v)[:24]
-		}
-	case "tls":
-		return s.cfg.KeyBytes[:24]
-	case "kcp":
-		v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.KCP.Key)))
-		return []byte(v)[:24]
-	}
-	return
-}
 func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	defer func() {
 		if e := recover(); e != nil {
@ -123,41 +90,19 @@ func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 		}
 	}()
 	//parent proxy
-	outconn, err := s.outPool.Get()
+	lbAddr := s.lb.Select((*inConn).RemoteAddr().String(), *s.cfg.LoadBalanceOnlyHA)
+
+	outconn, err := s.GetParentConn(lbAddr)
 	//outconn, err := s.GetParentConn(nil, nil, "", false)
 	if err != nil {
 		clean("connnect fail", fmt.Sprintf("%s", err))
 		return
 	}
-	if *s.cfg.ParentCompress {
-		outconn = utils.NewCompConn(outconn)
-	}
-	if *s.cfg.ParentKey != "" {
-		outconn = conncrypt.New(outconn, &conncrypt.Config{
-			Password: *s.cfg.ParentKey,
-		})
-	}
-
 	s.log.Printf("connect %s for udp", serverConn.Target())
 	//socks client
-	var client *socks.ClientConn
-	auth := serverConn.AuthData()
-	if *s.cfg.ParentAuth != "" {
-		a := strings.Split(*s.cfg.ParentAuth, ":")
-		if len(a) != 2 {
-			err = fmt.Errorf("parent auth data format error")
-			return
-		}
-		client = socks.NewClientConn(&outconn, "udp", serverConn.Target(), time.Millisecond*time.Duration(*s.cfg.Timeout), &socks.Auth{User: a[0], Password: a[1]}, nil)
-	} else {
-		if !s.IsBasicAuth() && auth.Password != "" && auth.User != "" {
-			client = socks.NewClientConn(&outconn, "udp", serverConn.Target(), time.Millisecond*time.Duration(*s.cfg.Timeout), &auth, nil)
-		} else {
-			client = socks.NewClientConn(&outconn, "udp", serverConn.Target(), time.Millisecond*time.Duration(*s.cfg.Timeout), nil, nil)
-		}
-	}

-	if err = client.Handshake(); err != nil {
+	client, err := s.HandshakeSocksParent(&outconn, "udp", serverConn.Target(), serverConn.AuthData(), false)
+	if err != nil {
 		clean("handshake fail", fmt.Sprintf("%s", err))
 		return
 	}
@ -181,9 +126,9 @@ func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 	//s.log.Printf("parent udp address %s", client.UDPAddr)
 	destAddr, _ = net.ResolveUDPAddr("udp", client.UDPAddr)
 	//relay
-	buf := utils.LeakyBuffer.Get()
-	defer utils.LeakyBuffer.Put(buf)
 	for {
+		buf := utils.LeakyBuffer.Get()
+		defer utils.LeakyBuffer.Put(buf)
 		n, srcAddr, err := udpListener.ReadFromUDP(buf)
 		if err != nil {
 			s.log.Printf("udp listener read fail, %s", err.Error())
@ -208,76 +153,42 @@ func (s *SPS) proxyUDP(inConn *net.Conn, serverConn *socks.ServerConn) {
 		} else {
 			err = p.Parse(buf[:n])
 		}
+		//err = p.Parse(buf[:n])
 		if err != nil {
 			s.log.Printf("udp listener parse packet fail, %s", err.Error())
 			continue
 		}
-
-		port, _ := strconv.Atoi(p.Port())
-
 		if v, ok := s.udpRelatedPacketConns.Get(srcAddr.String()); !ok {
-			if destAddr == nil {
-				destAddr = &net.UDPAddr{IP: net.ParseIP(p.Host()), Port: port}
-			}
 			outUDPConn, err = net.DialUDP("udp", localAddr, destAddr)
 			if err != nil {
 				s.log.Printf("create out udp conn fail , %s , from : %s", err, srcAddr)
 				continue
 			}
 			s.udpRelatedPacketConns.Set(srcAddr.String(), outUDPConn)
-			go func() {
-				defer func() {
-					if e := recover(); e != nil {
-						s.log.Printf("udp out->local io copy crashed:\n%s\n%s", e, string(debug.Stack()))
-					}
-				}()
-				defer s.udpRelatedPacketConns.Remove(srcAddr.String())
-				//out->local io copy
-				buf := utils.LeakyBuffer.Get()
-				defer utils.LeakyBuffer.Put(buf)
-				for {
-					outUDPConn.SetReadDeadline(time.Now().Add(time.Second * 5))
-					n, err := outUDPConn.Read(buf)
-					outUDPConn.SetReadDeadline(time.Time{})
+			utils.UDPCopy(udpListener, outUDPConn, srcAddr, 0, func(data []byte) []byte {
+				//forward to local
+				var v []byte
+				//convert parent data to raw
+				if len(s.udpParentKey) > 0 {
+					v, err = goaes.Decrypt(s.udpParentKey, data)
 					if err != nil {
-						s.log.Printf("read out udp data fail , %s , from : %s", err, srcAddr)
-						if isClosedErr(err) {
-							return
-						}
-						continue
-					}
-					//var dlen = n
-					//forward to local
-					var v []byte
-					//convert parent data to raw
-					if len(s.udpParentKey) > 0 {
-						v, err = goaes.Decrypt(s.udpParentKey, buf[:n])
-						if err != nil {
-							s.log.Printf("udp outconn parse packet fail, %s", err.Error())
-							continue
-						}
-					} else {
-						v = buf[:n]
-					}
-					//now v is raw, try convert v to local
-					if len(s.udpLocalKey) > 0 {
-						v, _ = goaes.Encrypt(s.udpLocalKey, v)
-					}
-					_, err = udpListener.WriteTo(v, srcAddr)
-					// _, err = udpListener.WriteTo(buf[:n], srcAddr)
-
-					if err != nil {
-						s.udpRelatedPacketConns.Remove(srcAddr.String())
-						s.log.Printf("write out data to local fail , %s , from : %s", err, srcAddr)
-						if isClosedErr(err) {
-							return
-						}
-						continue
-					} else {
-						//s.log.Printf("send udp data to local success , len %d, for : %s", dlen, srcAddr)
+						s.log.Printf("udp outconn parse packet fail, %s", err.Error())
+						return []byte{}
 					}
+				} else {
+					v = data
 				}
-			}()
+				//now v is raw, try convert v to local
+				if len(s.udpLocalKey) > 0 {
+					v, _ = goaes.Encrypt(s.udpLocalKey, v)
+				}
+				return v
+			}, func(err interface{}) {
+				s.udpRelatedPacketConns.Remove(srcAddr.String())
+				if err != nil {
+					s.log.Printf("udp out->local io copy crashed:\n%s\n%s", err, string(debug.Stack()))
+				}
+			})
 		} else {
 			outUDPConn = v.(*net.UDPConn)
 		}
--- a/services/sps/sps.go
+++ b/services/sps/sps.go
@ -2,6 +2,8 @@ package sps

 import (
 	"bytes"
+	"crypto/md5"
+	"crypto/tls"
 	"encoding/base64"
 	"errors"
 	"fmt"
@ -13,70 +15,97 @@ import (
 	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
 	"github.com/snail007/goproxy/utils/conncrypt"
+	"github.com/snail007/goproxy/utils/datasize"
+	"github.com/snail007/goproxy/utils/dnsx"
+	"github.com/snail007/goproxy/utils/iolimiter"
+	"github.com/snail007/goproxy/utils/lb"
+	"github.com/snail007/goproxy/utils/mapx"
 	"github.com/snail007/goproxy/utils/sni"
 	"github.com/snail007/goproxy/utils/socks"
+	"github.com/snail007/goproxy/utils/ss"
 )

 type SPSArgs struct {
-	Parent            *string
-	CertFile          *string
-	KeyFile           *string
-	CaCertFile        *string
-	CaCertBytes       []byte
-	CertBytes         []byte
-	KeyBytes          []byte
-	Local             *string
-	ParentType        *string
-	LocalType         *string
-	Timeout           *int
-	KCP               kcpcfg.KCPConfigArgs
-	ParentServiceType *string
-	DNSAddress        *string
-	DNSTTL            *int
-	AuthFile          *string
-	Auth              *[]string
-	AuthURL           *string
-	AuthURLOkCode     *int
-	AuthURLTimeout    *int
-	AuthURLRetry      *int
-	LocalIPS          *[]string
-	ParentAuth        *string
-	LocalKey          *string
-	ParentKey         *string
-	LocalCompress     *bool
-	ParentCompress    *bool
-	DisableHTTP       *bool
-	DisableSocks5     *bool
+	Parent                *[]string
+	CertFile              *string
+	KeyFile               *string
+	CaCertFile            *string
+	CaCertBytes           []byte
+	CertBytes             []byte
+	KeyBytes              []byte
+	Local                 *string
+	ParentType            *string
+	LocalType             *string
+	Timeout               *int
+	KCP                   kcpcfg.KCPConfigArgs
+	ParentServiceType     *string
+	DNSAddress            *string
+	DNSTTL                *int
+	AuthFile              *string
+	Auth                  *[]string
+	AuthURL               *string
+	AuthURLOkCode         *int
+	AuthURLTimeout        *int
+	AuthURLRetry          *int
+	LocalIPS              *[]string
+	ParentAuth            *string
+	LocalKey              *string
+	ParentKey             *string
+	LocalCompress         *bool
+	ParentCompress        *bool
+	SSMethod              *string
+	SSKey                 *string
+	ParentSSMethod        *string
+	ParentSSKey           *string
+	DisableHTTP           *bool
+	DisableSocks5         *bool
+	DisableSS             *bool
+	LoadBalanceMethod     *string
+	LoadBalanceTimeout    *int
+	LoadBalanceRetryTime  *int
+	LoadBalanceHashTarget *bool
+	LoadBalanceOnlyHA     *bool
+
+	RateLimit      *string
+	RateLimitBytes float64
+	Debug          *bool
 }
 type SPS struct {
-	outPool               utils.OutConn
 	cfg                   SPSArgs
-	domainResolver        utils.DomainResolver
+	domainResolver        dnsx.DomainResolver
 	basicAuth             utils.BasicAuth
-	serverChannels        []*utils.ServerChannel
-	userConns             utils.ConcurrentMap
+	serverChannels        []*server.ServerChannel
+	userConns             mapx.ConcurrentMap
 	log                   *logger.Logger
-	udpRelatedPacketConns utils.ConcurrentMap
+	localCipher           *ss.Cipher
+	parentCipher          *ss.Cipher
+	udpRelatedPacketConns mapx.ConcurrentMap
+	lb                    *lb.Group
 	udpLocalKey           []byte
 	udpParentKey          []byte
 }

 func NewSPS() services.Service {
 	return &SPS{
-		outPool:               utils.OutConn{},
 		cfg:                   SPSArgs{},
 		basicAuth:             utils.BasicAuth{},
-		serverChannels:        []*utils.ServerChannel{},
-		userConns:             utils.NewConcurrentMap(),
-		udpRelatedPacketConns: utils.NewConcurrentMap(),
+		serverChannels:        []*server.ServerChannel{},
+		userConns:             mapx.NewConcurrentMap(),
+		udpRelatedPacketConns: mapx.NewConcurrentMap(),
 	}
 }
 func (s *SPS) CheckArgs() (err error) {
-	if *s.cfg.Parent == "" {
+
+	if len(*s.cfg.Parent) == 1 && (*s.cfg.Parent)[0] == "" {
+		(*s.cfg.Parent) = []string{}
+	}
+
+	if len(*s.cfg.Parent) == 0 {
 		err = fmt.Errorf("parent required for %s %s", *s.cfg.LocalType, *s.cfg.Local)
 		return
 	}
@ -84,6 +113,10 @@ func (s *SPS) CheckArgs() (err error) {
 		err = fmt.Errorf("parent type unkown,use -T <tls|tcp|kcp>")
 		return
 	}
+	if *s.cfg.ParentType == "ss" && (*s.cfg.ParentSSKey == "" || *s.cfg.ParentSSMethod == "") {
+		err = fmt.Errorf("ss parent need a ss key, set it by : -J <sskey>")
+		return
+	}
 	if *s.cfg.ParentType == "tls" || *s.cfg.LocalType == "tls" {
 		s.cfg.CertBytes, s.cfg.KeyBytes, err = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
 		if err != nil {
@ -97,31 +130,45 @@ func (s *SPS) CheckArgs() (err error) {
 			}
 		}
 	}
+	if *s.cfg.RateLimit != "0" && *s.cfg.RateLimit != "" {
+		var size uint64
+		size, err = datasize.Parse(*s.cfg.RateLimit)
+		if err != nil {
+			err = fmt.Errorf("parse rate limit size error,ERR:%s", err)
+			return
+		}
+		s.cfg.RateLimitBytes = float64(size)
+	}
 	s.udpLocalKey = s.LocalUDPKey()
 	s.udpParentKey = s.ParentUDPKey()
 	return
 }
 func (s *SPS) InitService() (err error) {
+
 	if *s.cfg.DNSAddress != "" {
-		(*s).domainResolver = utils.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
+		s.domainResolver = dnsx.NewDomainResolver(*s.cfg.DNSAddress, *s.cfg.DNSTTL, s.log)
 	}
-	s.InitOutConnPool()
+
+	if len(*s.cfg.Parent) > 0 {
+		s.InitLB()
+	}
+
 	err = s.InitBasicAuth()
-	return
-}
-func (s *SPS) InitOutConnPool() {
-	if *s.cfg.ParentType == "tls" || *s.cfg.ParentType == "tcp" || *s.cfg.ParentType == "kcp" {
-		//dur int, isTLS bool, certBytes, keyBytes []byte,
-		//parent string, timeout int, InitialCap int, MaxCap int
-		s.outPool = utils.NewOutConn(
-			0,
-			*s.cfg.ParentType,
-			s.cfg.KCP,
-			s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes,
-			*s.cfg.Parent,
-			*s.cfg.Timeout,
-		)
+	if *s.cfg.SSMethod != "" && *s.cfg.SSKey != "" {
+		s.localCipher, err = ss.NewCipher(*s.cfg.SSMethod, *s.cfg.SSKey)
+		if err != nil {
+			s.log.Printf("error generating cipher : %s", err)
+			return
+		}
 	}
+	if *s.cfg.ParentServiceType == "ss" {
+		s.parentCipher, err = ss.NewCipher(*s.cfg.ParentSSMethod, *s.cfg.ParentSSKey)
+		if err != nil {
+			s.log.Printf("error generating cipher : %s", err)
+			return
+		}
+	}
+	return
 }

 func (s *SPS) StopService() {
@ -132,6 +179,19 @@ func (s *SPS) StopService() {
 		} else {
 			s.log.Printf("service sps stoped")
 		}
+		s.basicAuth = utils.BasicAuth{}
+		s.cfg = SPSArgs{}
+		s.domainResolver = dnsx.DomainResolver{}
+		s.lb = nil
+		s.localCipher = nil
+		s.log = nil
+		s.parentCipher = nil
+		s.serverChannels = nil
+		s.udpLocalKey = nil
+		s.udpParentKey = nil
+		s.udpRelatedPacketConns = nil
+		s.userConns = nil
+		s = nil
 	}()
 	for _, sc := range s.serverChannels {
 		if sc.Listener != nil && *sc.Listener != nil {
@ -149,6 +209,12 @@ func (s *SPS) StopService() {
 			(*(*c.(**net.Conn))).Close()
 		}
 	}
+	if s.lb != nil {
+		s.lb.Stop()
+	}
+	for _, c := range s.udpRelatedPacketConns.Items() {
+		(*c.(*net.UDPConn)).Close()
+	}
 }
 func (s *SPS) Start(args interface{}, log *logger.Logger) (err error) {
 	s.log = log
@ -159,24 +225,30 @@ func (s *SPS) Start(args interface{}, log *logger.Logger) (err error) {
 	if err = s.InitService(); err != nil {
 		return
 	}
-	s.log.Printf("use %s %s parent %s", *s.cfg.ParentType, *s.cfg.ParentServiceType, *s.cfg.Parent)
+
+	s.log.Printf("use %s %s parent %v [ %s ]", *s.cfg.ParentType, *s.cfg.ParentServiceType, *s.cfg.Parent, strings.ToUpper(*s.cfg.LoadBalanceMethod))
 	for _, addr := range strings.Split(*s.cfg.Local, ",") {
 		if addr != "" {
 			host, port, _ := net.SplitHostPort(addr)
 			p, _ := strconv.Atoi(port)
-			sc := utils.NewServerChannel(host, p, s.log)
+			sc := server.NewServerChannel(host, p, s.log)
+			s.serverChannels = append(s.serverChannels, &sc)
 			if *s.cfg.LocalType == "tcp" {
 				err = sc.ListenTCP(s.callback)
 			} else if *s.cfg.LocalType == "tls" {
-				err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes, s.callback)
-			} else if *s.cfg.LocalType == "kcp" {
+				err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes, s.callback)
+			} else if *s.cfg.LocalType == "tcp" {
 				err = sc.ListenKCP(s.cfg.KCP, s.callback, s.log)
 			}
+			if *s.cfg.ParentServiceType == "socks" {
+				err = s.RunSSUDP(addr)
+			} else {
+				s.log.Println("warn : udp only for socks parent ")
+			}
 			if err != nil {
 				return
 			}
-			s.log.Printf("%s http(s)+socks proxy on %s", *s.cfg.LocalType, (*sc.Listener).Addr())
-			s.serverChannels = append(s.serverChannels, &sc)
+			s.log.Printf("%s http(s)+socks+ss proxy on %s", *s.cfg.LocalType, (*sc.Listener).Addr())
 		}
 	}
 	return
@ -200,22 +272,19 @@ func (s *SPS) callback(inConn net.Conn) {
 		})
 	}
 	var err error
+	lbAddr := ""
 	switch *s.cfg.ParentType {
-	case "kcp":
-		fallthrough
-	case "tcp":
-		fallthrough
-	case "tls":
-		err = s.OutToTCP(&inConn)
+	case "kcp", "tcp", "tls":
+		lbAddr, err = s.OutToTCP(&inConn)
 	default:
 		err = fmt.Errorf("unkown parent type %s", *s.cfg.ParentType)
 	}
 	if err != nil {
-		s.log.Printf("connect to %s parent %s fail, ERR:%s from %s", *s.cfg.ParentType, *s.cfg.Parent, err, inConn.RemoteAddr())
+		s.log.Printf("connect to %s parent %s fail, ERR:%s from %s", *s.cfg.ParentType, lbAddr, err, inConn.RemoteAddr())
 		utils.CloseConn(&inConn)
 	}
 }
-func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
+func (s *SPS) OutToTCP(inConn *net.Conn) (lbAddr string, err error) {
 	enableUDP := *s.cfg.ParentServiceType == "socks"
 	udpIP, _, _ := net.SplitHostPort((*inConn).LocalAddr().String())
 	if len(*s.cfg.LocalIPS) > 0 {
@ -243,9 +312,9 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 	isSNI, _ := sni.ServerNameFromBytes(h)
 	*inConn = bInConn
 	address := ""
-	var auth socks.Auth
+	var auth = socks.Auth{}
 	var forwardBytes []byte
-	//fmt.Printf("%v", h)
+	//fmt.Printf("%v", header)
 	if utils.IsSocks5(h) {
 		if *s.cfg.DisableSocks5 {
 			(*inConn).Close()
@ -291,7 +360,6 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 			request.HTTPSReply()
 			//s.log.Printf("https reply: %s", request.Host)
 		} else {
-			//forwardBytes = bytes.TrimRight(request.HeadBuf,"\r\n")
 			forwardBytes = request.HeadBuf
 		}
 		address = request.Host
@ -306,6 +374,25 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 				auth = socks.Auth{User: userpassA[0], Password: userpassA[1]}
 			}
 		}
+	} else {
+		//ss
+		if *s.cfg.DisableSS {
+			(*inConn).Close()
+			return
+		}
+		(*inConn).SetDeadline(time.Now().Add(time.Second * 5))
+		ssConn := ss.NewConn(*inConn, s.localCipher.Copy())
+		address, err = ss.GetRequest(ssConn)
+		(*inConn).SetDeadline(time.Time{})
+		if err != nil {
+			return
+		}
+		// ensure the host does not contain some illegal characters, NUL may panic on Win32
+		if strings.ContainsRune(address, 0x00) {
+			err = errors.New("invalid domain name")
+			return
+		}
+		*inConn = ssConn
 	}
 	if err != nil || address == "" {
 		s.log.Printf("unknown request from: %s,%s", (*inConn).RemoteAddr(), string(h))
@ -316,22 +403,19 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 	}
 	//connect to parent
 	var outConn net.Conn
-	outConn, err = s.outPool.Get()
+	selectAddr := (*inConn).RemoteAddr().String()
+	if utils.LBMethod(*s.cfg.LoadBalanceMethod) == lb.SELECT_HASH && *s.cfg.LoadBalanceHashTarget {
+		selectAddr = address
+	}
+	lbAddr = s.lb.Select(selectAddr, *s.cfg.LoadBalanceOnlyHA)
+	outConn, err = s.GetParentConn(lbAddr)
 	if err != nil {
-		s.log.Printf("connect to %s , err:%s", *s.cfg.Parent, err)
+		s.log.Printf("connect to %s , err:%s", lbAddr, err)
 		utils.CloseConn(inConn)
 		return
 	}
-	if *s.cfg.ParentCompress {
-		outConn = utils.NewCompConn(outConn)
-	}
-	if *s.cfg.ParentKey != "" {
-		outConn = conncrypt.New(outConn, &conncrypt.Config{
-			Password: *s.cfg.ParentKey,
-		})
-	}

-	if *s.cfg.ParentAuth != "" || s.IsBasicAuth() {
+	if *s.cfg.ParentAuth != "" || *s.cfg.ParentSSKey != "" || s.IsBasicAuth() {
 		forwardBytes = utils.RemoveProxyHeaders(forwardBytes)
 	}

@ -345,7 +429,10 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 			isHTTPS = true
 			pb.Write([]byte(fmt.Sprintf("CONNECT %s HTTP/1.1\r\n", address)))
 		}
+		pb.WriteString(fmt.Sprintf("Host: %s\r\n", address))
+		pb.WriteString(fmt.Sprintf("Proxy-Host: %s\r\n", address))
 		pb.WriteString("Proxy-Connection: Keep-Alive\r\n")
+		pb.WriteString("Connection: Keep-Alive\r\n")

 		u := ""
 		if *s.cfg.ParentAuth != "" {
@ -377,7 +464,7 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 		_, err = outConn.Write(pb.Bytes())
 		outConn.SetDeadline(time.Time{})
 		if err != nil {
-			s.log.Printf("write CONNECT to %s , err:%s", *s.cfg.Parent, err)
+			s.log.Printf("write CONNECT to %s , err:%s", lbAddr, err)
 			utils.CloseConn(inConn)
 			utils.CloseConn(&outConn)
 			return
@ -389,7 +476,7 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 			_, err = outConn.Read(reply)
 			outConn.SetDeadline(time.Time{})
 			if err != nil {
-				s.log.Printf("read reply from %s , err:%s", *s.cfg.Parent, err)
+				s.log.Printf("read reply from %s , err:%s", lbAddr, err)
 				utils.CloseConn(inConn)
 				utils.CloseConn(&outConn)
 				return
@ -398,23 +485,24 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 		}
 	} else if *s.cfg.ParentServiceType == "socks" {
 		s.log.Printf("connect %s", address)
+
 		//socks client
-		var clientConn *socks.ClientConn
-		if *s.cfg.ParentAuth != "" {
-			a := strings.Split(*s.cfg.ParentAuth, ":")
-			if len(a) != 2 {
-				err = fmt.Errorf("parent auth data format error")
-				return
-			}
-			clientConn = socks.NewClientConn(&outConn, "tcp", address, time.Millisecond*time.Duration(*s.cfg.Timeout), &socks.Auth{User: a[0], Password: a[1]}, nil)
-		} else {
-			if !s.IsBasicAuth() && auth.Password != "" && auth.User != "" {
-				clientConn = socks.NewClientConn(&outConn, "tcp", address, time.Millisecond*time.Duration(*s.cfg.Timeout), &auth, nil)
-			} else {
-				clientConn = socks.NewClientConn(&outConn, "tcp", address, time.Millisecond*time.Duration(*s.cfg.Timeout), nil, nil)
-			}
+		_, err = s.HandshakeSocksParent(&outConn, "tcp", address, auth, false)
+		if err != nil {
+			s.log.Printf("handshake fail, %s", err)
+			return
 		}
-		if err = clientConn.Handshake(); err != nil {
+
+	} else if *s.cfg.ParentServiceType == "ss" {
+		ra, e := ss.RawAddr(address)
+		if e != nil {
+			err = fmt.Errorf("build ss raw addr fail, err: %s", e)
+			return
+		}
+
+		outConn, err = ss.DialWithRawAddr(&outConn, ra, "", s.parentCipher.Copy())
+		if err != nil {
+			err = fmt.Errorf("dial ss parent fail, err : %s", err)
 			return
 		}
 	}
@ -424,18 +512,27 @@ func (s *SPS) OutToTCP(inConn *net.Conn) (err error) {
 		outConn.Write(forwardBytes)
 	}

+	if s.cfg.RateLimitBytes > 0 {
+		outConn = iolimiter.NewReaderConn(outConn, s.cfg.RateLimitBytes)
+	}
+
 	//bind
 	inAddr := (*inConn).RemoteAddr().String()
 	outAddr := outConn.RemoteAddr().String()
 	utils.IoBind((*inConn), outConn, func(err interface{}) {
 		s.log.Printf("conn %s - %s released [%s]", inAddr, outAddr, address)
 		s.userConns.Remove(inAddr)
+		s.lb.DecreaseConns(lbAddr)
 	}, s.log)
 	s.log.Printf("conn %s - %s connected [%s]", inAddr, outAddr, address)
+
+	s.lb.IncreasConns(lbAddr)
+
 	if c, ok := s.userConns.Get(inAddr); ok {
 		(*c.(*net.Conn)).Close()
 	}
 	s.userConns.Set(inAddr, inConn)
+
 	return
 }
 func (s *SPS) InitBasicAuth() (err error) {
@ -463,6 +560,27 @@ func (s *SPS) InitBasicAuth() (err error) {
 	}
 	return
 }
+func (s *SPS) InitLB() {
+	configs := lb.BackendsConfig{}
+	for _, addr := range *s.cfg.Parent {
+		_addrInfo := strings.Split(addr, "@")
+		_addr := _addrInfo[0]
+		weight := 1
+		if len(_addrInfo) == 2 {
+			weight, _ = strconv.Atoi(_addrInfo[1])
+		}
+		configs = append(configs, &lb.BackendConfig{
+			Address:       _addr,
+			Weight:        weight,
+			ActiveAfter:   1,
+			InactiveAfter: 2,
+			Timeout:       time.Duration(*s.cfg.LoadBalanceTimeout) * time.Millisecond,
+			RetryTime:     time.Duration(*s.cfg.LoadBalanceRetryTime) * time.Millisecond,
+		})
+	}
+	LB := lb.NewGroup(utils.LBMethod(*s.cfg.LoadBalanceMethod), configs, &s.domainResolver, s.log, *s.cfg.Debug)
+	s.lb = &LB
+}
 func (s *SPS) IsBasicAuth() bool {
 	return *s.cfg.AuthFile != "" || len(*s.cfg.Auth) > 0 || *s.cfg.AuthURL != ""
 }
@ -515,3 +633,75 @@ func (s *SPS) Resolve(address string) string {
 	}
 	return ip
 }
+func (s *SPS) GetParentConn(address string) (conn net.Conn, err error) {
+	if *s.cfg.ParentType == "tls" {
+		var _conn tls.Conn
+		_conn, err = utils.TlsConnectHost(address, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, s.cfg.CaCertBytes)
+		if err == nil {
+			conn = net.Conn(&_conn)
+		}
+	} else if *s.cfg.ParentType == "kcp" {
+		conn, err = utils.ConnectKCPHost(address, s.cfg.KCP)
+	} else {
+		conn, err = utils.ConnectHost(address, *s.cfg.Timeout)
+	}
+	if err == nil {
+		if *s.cfg.ParentCompress {
+			conn = utils.NewCompConn(conn)
+		}
+		if *s.cfg.ParentKey != "" {
+			conn = conncrypt.New(conn, &conncrypt.Config{
+				Password: *s.cfg.ParentKey,
+			})
+		}
+	}
+	return
+}
+func (s *SPS) HandshakeSocksParent(outconn *net.Conn, network, dstAddr string, auth socks.Auth, fromSS bool) (client *socks.ClientConn, err error) {
+	if *s.cfg.ParentAuth != "" {
+		a := strings.Split(*s.cfg.ParentAuth, ":")
+		if len(a) != 2 {
+			err = fmt.Errorf("parent auth data format error")
+			return
+		}
+		client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), &socks.Auth{User: a[0], Password: a[1]}, nil)
+	} else {
+		if !fromSS && !s.IsBasicAuth() && auth.Password != "" && auth.User != "" {
+			client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), &auth, nil)
+		} else {
+			client = socks.NewClientConn(outconn, network, dstAddr, time.Millisecond*time.Duration(*s.cfg.Timeout), nil, nil)
+		}
+	}
+	err = client.Handshake()
+	return
+}
+func (s *SPS) ParentUDPKey() (key []byte) {
+	switch *s.cfg.ParentType {
+	case "tcp":
+		if *s.cfg.ParentKey != "" {
+			v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.ParentKey)))
+			return []byte(v)[:24]
+		}
+	case "tls":
+		return s.cfg.KeyBytes[:24]
+	case "kcp":
+		v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.KCP.Key)))
+		return []byte(v)[:24]
+	}
+	return
+}
+func (s *SPS) LocalUDPKey() (key []byte) {
+	switch *s.cfg.LocalType {
+	case "tcp":
+		if *s.cfg.LocalKey != "" {
+			v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.LocalKey)))
+			return []byte(v)[:24]
+		}
+	case "tls":
+		return s.cfg.KeyBytes[:24]
+	case "kcp":
+		v := fmt.Sprintf("%x", md5.Sum([]byte(*s.cfg.KCP.Key)))
+		return []byte(v)[:24]
+	}
+	return
+}
--- a/services/sps/ssudp.go
+++ b/services/sps/ssudp.go
@ -0,0 +1,161 @@
+package sps
+
+import (
+	"bytes"
+	"fmt"
+	"net"
+	"runtime/debug"
+	"time"
+
+	"github.com/snail007/goproxy/utils"
+	goaes "github.com/snail007/goproxy/utils/aes"
+	"github.com/snail007/goproxy/utils/socks"
+)
+
+func (s *SPS) RunSSUDP(addr string) (err error) {
+	a, _ := net.ResolveUDPAddr("udp", addr)
+	listener, err := net.ListenUDP("udp", a)
+	if err != nil {
+		s.log.Printf("ss udp bind error %s", err)
+		return
+	}
+	s.log.Printf("ss udp on %s", listener.LocalAddr())
+	s.udpRelatedPacketConns.Set(addr, listener)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				s.log.Printf("udp local->out io copy crashed:\n%s\n%s", e, string(debug.Stack()))
+			}
+		}()
+		for {
+			buf := utils.LeakyBuffer.Get()
+			defer utils.LeakyBuffer.Put(buf)
+			n, srcAddr, err := listener.ReadFrom(buf)
+			if err != nil {
+				s.log.Printf("read from client error %s", err)
+				if utils.IsNetClosedErr(err) {
+					return
+				}
+				continue
+			}
+			var (
+				inconnRemoteAddr = srcAddr.String()
+				outUDPConn       *net.UDPConn
+				outconn          net.Conn
+				outconnLocalAddr string
+				destAddr         *net.UDPAddr
+				clean            = func(msg, err string) {
+					raddr := ""
+					if outUDPConn != nil {
+						raddr = outUDPConn.RemoteAddr().String()
+						outUDPConn.Close()
+					}
+					if msg != "" {
+						if raddr != "" {
+							s.log.Printf("%s , %s , %s -> %s", msg, err, inconnRemoteAddr, raddr)
+						} else {
+							s.log.Printf("%s , %s , from : %s", msg, err, inconnRemoteAddr)
+						}
+					}
+					s.userConns.Remove(inconnRemoteAddr)
+					if outconn != nil {
+						outconn.Close()
+					}
+					if outconnLocalAddr != "" {
+						s.userConns.Remove(outconnLocalAddr)
+					}
+				}
+			)
+			defer clean("", "")
+
+			raw := new(bytes.Buffer)
+			raw.Write([]byte{0x00, 0x00, 0x00})
+			raw.Write(s.localCipher.Decrypt(buf[:n]))
+			socksPacket := socks.NewPacketUDP()
+			err = socksPacket.Parse(raw.Bytes())
+			raw = nil
+			if err != nil {
+				s.log.Printf("udp parse error %s", err)
+				return
+			}
+
+			if v, ok := s.udpRelatedPacketConns.Get(inconnRemoteAddr); !ok {
+				//socks client
+				lbAddr := s.lb.Select(inconnRemoteAddr, *s.cfg.LoadBalanceOnlyHA)
+				outconn, err := s.GetParentConn(lbAddr)
+				if err != nil {
+					clean("connnect fail", fmt.Sprintf("%s", err))
+					return
+				}
+
+				client, err := s.HandshakeSocksParent(&outconn, "udp", socksPacket.Addr(), socks.Auth{}, true)
+				if err != nil {
+					clean("handshake fail", fmt.Sprintf("%s", err))
+					return
+				}
+
+				outconnLocalAddr = outconn.LocalAddr().String()
+				s.userConns.Set(outconnLocalAddr, &outconn)
+				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							s.log.Printf("udp related parent tcp conn read crashed:\n%s\n%s", e, string(debug.Stack()))
+						}
+					}()
+					buf := make([]byte, 1)
+					outconn.SetReadDeadline(time.Time{})
+					if _, err := outconn.Read(buf); err != nil {
+						clean("udp parent tcp conn disconnected", fmt.Sprintf("%s", err))
+					}
+				}()
+				destAddr, _ = net.ResolveUDPAddr("udp", client.UDPAddr)
+				localZeroAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
+				outUDPConn, err = net.DialUDP("udp", localZeroAddr, destAddr)
+				if err != nil {
+					s.log.Printf("create out udp conn fail , %s , from : %s", err, srcAddr)
+					return
+				}
+				s.udpRelatedPacketConns.Set(srcAddr.String(), outUDPConn)
+				utils.UDPCopy(listener, outUDPConn, srcAddr, time.Second*5, func(data []byte) []byte {
+					//forward to local
+					var v []byte
+					//convert parent data to raw
+					if len(s.udpParentKey) > 0 {
+						v, err = goaes.Decrypt(s.udpParentKey, data)
+						if err != nil {
+							s.log.Printf("udp outconn parse packet fail, %s", err.Error())
+							return []byte{}
+						}
+					} else {
+						v = data
+					}
+					return s.localCipher.Encrypt(v[3:])
+				}, func(err interface{}) {
+					s.udpRelatedPacketConns.Remove(srcAddr.String())
+					if err != nil {
+						s.log.Printf("udp out->local io copy crashed:\n%s\n%s", err, string(debug.Stack()))
+					}
+				})
+			} else {
+				outUDPConn = v.(*net.UDPConn)
+			}
+			//forward to parent
+			//p is raw, now convert it to parent
+			var v []byte
+			if len(s.udpParentKey) > 0 {
+				v, _ = goaes.Encrypt(s.udpParentKey, socksPacket.Bytes())
+			} else {
+				v = socksPacket.Bytes()
+			}
+			_, err = outUDPConn.Write(v)
+			socksPacket = socks.PacketUDP{}
+			if err != nil {
+				if utils.IsNetClosedErr(err) {
+					return
+				}
+				s.log.Printf("send out udp data fail , %s , from : %s", err, srcAddr)
+			}
+		}
+	}()
+	return
+}
--- a/services/tcp/tcp.go
+++ b/services/tcp/tcp.go
@ -1,17 +1,20 @@
 package tcp

 import (
-	"bufio"
+	"crypto/tls"
 	"fmt"
-	"io"
 	logger "log"
 	"net"
 	"runtime/debug"
+	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/cs/server"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/jumper"
+	"github.com/snail007/goproxy/utils/mapx"

 	"strconv"
 )
@ -28,27 +31,37 @@ type TCPArgs struct {
 	Timeout             *int
 	CheckParentInterval *int
 	KCP                 kcpcfg.KCPConfigArgs
+	Jumper              *string
+}
+type UDPConnItem struct {
+	conn      *net.Conn
+	isActive  bool
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	udpConn   *net.UDPConn
+	connid    string
 }
-
 type TCP struct {
-	outPool   utils.OutConn
 	cfg       TCPArgs
-	sc        *utils.ServerChannel
+	sc        *server.ServerChannel
 	isStop    bool
-	userConns utils.ConcurrentMap
+	userConns mapx.ConcurrentMap
 	log       *logger.Logger
+	jumper    *jumper.Jumper
+	udpConns  mapx.ConcurrentMap
 }

 func NewTCP() services.Service {
 	return &TCP{
-		outPool:   utils.OutConn{},
 		cfg:       TCPArgs{},
 		isStop:    false,
-		userConns: utils.NewConcurrentMap(),
+		userConns: mapx.NewConcurrentMap(),
+		udpConns:  mapx.NewConcurrentMap(),
 	}
 }
 func (s *TCP) CheckArgs() (err error) {
-	if *s.cfg.Parent == "" {
+	if len(*s.cfg.Parent) == 0 {
 		err = fmt.Errorf("parent required for %s %s", *s.cfg.LocalType, *s.cfg.Local)
 		return
 	}
@ -62,10 +75,23 @@ func (s *TCP) CheckArgs() (err error) {
 			return
 		}
 	}
+	if *s.cfg.Jumper != "" {
+		if *s.cfg.ParentType != "tls" && *s.cfg.ParentType != "tcp" {
+			err = fmt.Errorf("jumper only worked of -T is tls or tcp")
+			return
+		}
+		var j jumper.Jumper
+		j, err = jumper.New(*s.cfg.Jumper, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err != nil {
+			err = fmt.Errorf("parse jumper fail, err %s", err)
+			return
+		}
+		s.jumper = &j
+	}
 	return
 }
 func (s *TCP) InitService() (err error) {
-	s.InitOutConnPool()
+	s.UDPGCDeamon()
 	return
 }
 func (s *TCP) StopService() {
@ -76,6 +102,12 @@ func (s *TCP) StopService() {
 		} else {
 			s.log.Printf("service tcp stoped")
 		}
+		s.cfg = TCPArgs{}
+		s.jumper = nil
+		s.log = nil
+		s.sc = nil
+		s.userConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	if s.sc.Listener != nil && *s.sc.Listener != nil {
@ -97,15 +129,15 @@ func (s *TCP) Start(args interface{}, log *logger.Logger) (err error) {
 	if err = s.InitService(); err != nil {
 		return
 	}
-	s.log.Printf("use %s parent %s", *s.cfg.ParentType, *s.cfg.Parent)
+	s.log.Printf("use %s parent %v", *s.cfg.ParentType, *s.cfg.Parent)
 	host, port, _ := net.SplitHostPort(*s.cfg.Local)
 	p, _ := strconv.Atoi(port)
-	sc := utils.NewServerChannel(host, p, s.log)
+	sc := server.NewServerChannel(host, p, s.log)

 	if *s.cfg.LocalType == "tcp" {
 		err = sc.ListenTCP(s.callback)
 	} else if *s.cfg.LocalType == "tls" {
-		err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.callback)
+		err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.callback)
 	} else if *s.cfg.LocalType == "kcp" {
 		err = sc.ListenKCP(s.cfg.KCP, s.callback, s.log)
 	}
@ -127,26 +159,26 @@ func (s *TCP) callback(inConn net.Conn) {
 		}
 	}()
 	var err error
+	lbAddr := ""
 	switch *s.cfg.ParentType {
-	case "kcp":
-		fallthrough
-	case "tcp":
-		fallthrough
-	case "tls":
+	case "kcp", "tcp", "tls":
 		err = s.OutToTCP(&inConn)
 	case "udp":
-		err = s.OutToUDP(&inConn)
+		s.OutToUDP(&inConn)
 	default:
 		err = fmt.Errorf("unkown parent type %s", *s.cfg.ParentType)
 	}
 	if err != nil {
-		s.log.Printf("connect to %s parent %s fail, ERR:%s", *s.cfg.ParentType, *s.cfg.Parent, err)
+		if !utils.IsNetClosedErr(err) {
+			s.log.Printf("connect to %s parent %s fail, ERR:%s", *s.cfg.ParentType, lbAddr, err)
+		}
 		utils.CloseConn(&inConn)
 	}
 }
 func (s *TCP) OutToTCP(inConn *net.Conn) (err error) {
+
 	var outConn net.Conn
-	outConn, err = s.outPool.Get()
+	outConn, err = s.GetParentConn()
 	if err != nil {
 		s.log.Printf("connect to %s , err:%s", *s.cfg.Parent, err)
 		utils.CloseConn(inConn)
@ -168,68 +200,165 @@ func (s *TCP) OutToTCP(inConn *net.Conn) (err error) {
 	return
 }
 func (s *TCP) OutToUDP(inConn *net.Conn) (err error) {
-	s.log.Printf("conn created , remote : %s ", (*inConn).RemoteAddr())
+	var item *UDPConnItem
+	var body []byte
+	srcAddr := ""
+	defer func() {
+		if item != nil {
+			(*item.conn).Close()
+			item.udpConn.Close()
+			s.udpConns.Remove(srcAddr)
+			(*inConn).Close()
+		}
+	}()
 	for {
 		if s.isStop {
-			(*inConn).Close()
 			return
 		}
-		srcAddr, body, err := utils.ReadUDPPacket(bufio.NewReader(*inConn))
-		if err == io.EOF || err == io.ErrUnexpectedEOF {
-			//s.log.Printf("connection %s released", srcAddr)
-			utils.CloseConn(inConn)
-			break
-		}
-		//log.Debugf("udp packet revecived:%s,%v", srcAddr, body)
-		dstAddr, err := net.ResolveUDPAddr("udp", *s.cfg.Parent)
+		var srcAddr string
+		srcAddr, body, err = utils.ReadUDPPacket(*inConn)
 		if err != nil {
-			s.log.Printf("can't resolve address: %s", err)
-			utils.CloseConn(inConn)
-			break
+			if strings.Contains(err.Error(), "n != int(") {
+				continue
+			}
+			// if !utils.IsNetDeadlineErr(err) && err != io.EOF && !utils.IsNetClosedErr(err) {
+			// 	s.log.Printf("udp packet revecived from client fail, err: %s", err)
+			// }
+			return
 		}
-		clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-		conn, err := net.DialUDP("udp", clientSrcAddr, dstAddr)
-		if err != nil {
-			s.log.Printf("connect to udp %s fail,ERR:%s", dstAddr.String(), err)
-			continue
+		localAddr := *s.cfg.Parent
+		if v, ok := s.udpConns.Get(srcAddr); !ok {
+			_srcAddr, _ := net.ResolveUDPAddr("udp", srcAddr)
+			zeroAddr, _ := net.ResolveUDPAddr("udp", ":")
+			_localAddr, _ := net.ResolveUDPAddr("udp", localAddr)
+			var c *net.UDPConn
+			c, err = net.DialUDP("udp", zeroAddr, _localAddr)
+			if err != nil {
+				s.log.Printf("create local udp conn fail, err : %s", err)
+				(*inConn).Close()
+				return
+			}
+			item = &UDPConnItem{
+				conn:      inConn,
+				srcAddr:   _srcAddr,
+				localAddr: _localAddr,
+				udpConn:   c,
+			}
+			s.udpConns.Set(srcAddr, item)
+			s.UDPRevecive(srcAddr)
+		} else {
+			item = v.(*UDPConnItem)
 		}
-		conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-		_, err = conn.Write(body)
-		if err != nil {
-			s.log.Printf("send udp packet to %s fail,ERR:%s", dstAddr.String(), err)
-			continue
+		item.touchtime = time.Now().Unix()
+		go item.udpConn.Write(body)
+	}
+}
+func (s *TCP) UDPRevecive(key string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", key)
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s", key)
+			return
 		}
-		//log.Debugf("send udp packet to %s success", dstAddr.String())
-		buf := make([]byte, 512)
-		len, _, err := conn.ReadFromUDP(buf)
-		if err != nil {
-			s.log.Printf("read udp response from %s fail ,ERR:%s", dstAddr.String(), err)
-			continue
+		cui := v.(*UDPConnItem)
+		buf := utils.LeakyBuffer.Get()
+		defer func() {
+			utils.LeakyBuffer.Put(buf)
+			(*cui.conn).Close()
+			cui.udpConn.Close()
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", key)
+		}()
+		for {
+			n, err := cui.udpConn.Read(buf)
+			if err != nil {
+				if !utils.IsNetClosedErr(err) {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			cui.touchtime = time.Now().Unix()
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+					}
+				}()
+				(*cui.conn).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+				_, err = (*cui.conn).Write(utils.UDPPacket(cui.srcAddr.String(), buf[:n]))
+				(*cui.conn).SetWriteDeadline(time.Time{})
+				if err != nil {
+					cui.udpConn.Close()
+					return
+				}
+			}()
 		}
-		respBody := buf[0:len]
-		//log.Debugf("revecived udp packet from %s , %v", dstAddr.String(), respBody)
-		_, err = (*inConn).Write(utils.UDPPacket(srcAddr, respBody))
-		if err != nil {
-			s.log.Printf("send udp response fail ,ERR:%s", err)
-			utils.CloseConn(inConn)
-			break
+	}()
+}
+func (s *TCP) UDPGCDeamon() {
+	gctime := int64(30)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
+		for {
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*UDPConnItem).touchtime > gctime {
+					(*(v.(*UDPConnItem).conn)).Close()
+					(v.(*UDPConnItem).udpConn).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", key)
+				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
+			}
+			gcKeys = nil
+		}
+	}()
+}
+func (s *TCP) GetParentConn() (conn net.Conn, err error) {
+	if *s.cfg.ParentType == "tls" {
+		if s.jumper == nil {
+			var _conn tls.Conn
+			_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err == nil {
+				conn = net.Conn(&_conn)
+			}
+		} else {
+			conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+			if err != nil {
+				return nil, err
+			}
+			var _c net.Conn
+			_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+			if err == nil {
+				conn = net.Conn(tls.Client(_c, conf))
+			}
+		}
+
+	} else if *s.cfg.ParentType == "kcp" {
+		conn, err = utils.ConnectKCPHost(*s.cfg.Parent, s.cfg.KCP)
+	} else {
+		if s.jumper == nil {
+			conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
+		} else {
+			conn, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
 		}
-		//s.log.Printf("send udp response success ,from:%s", dstAddr.String())
 	}
 	return
-
-}
-func (s *TCP) InitOutConnPool() {
-	if *s.cfg.ParentType == "tls" || *s.cfg.ParentType == "tcp" || *s.cfg.ParentType == "kcp" {
-		//dur int, isTLS bool, certBytes, keyBytes []byte,
-		//parent string, timeout int, InitialCap int, MaxCap int
-		s.outPool = utils.NewOutConn(
-			*s.cfg.CheckParentInterval,
-			*s.cfg.ParentType,
-			s.cfg.KCP,
-			s.cfg.CertBytes, s.cfg.KeyBytes, nil,
-			*s.cfg.Parent,
-			*s.cfg.Timeout,
-		)
-	}
 }
--- a/services/tunnel/tunnel_bridge.go
+++ b/services/tunnel/tunnel_bridge.go
@ -7,10 +7,13 @@ import (
 	"net"
 	"os"
 	"strconv"
+	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/cs/server"
 	"github.com/snail007/goproxy/services"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/mapx"

 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
@ -30,7 +33,6 @@ type TunnelBridgeArgs struct {
 	KeyBytes  []byte
 	Local     *string
 	Timeout   *int
-	Mux       *bool
 }
 type ServerConn struct {
 	//ClientLocalAddr string //tcp:2.2.22:333@ID
@ -38,8 +40,8 @@ type ServerConn struct {
 }
 type TunnelBridge struct {
 	cfg                TunnelBridgeArgs
-	serverConns        utils.ConcurrentMap
-	clientControlConns utils.ConcurrentMap
+	serverConns        mapx.ConcurrentMap
+	clientControlConns mapx.ConcurrentMap
 	isStop             bool
 	log                *logger.Logger
 }
@ -47,8 +49,8 @@ type TunnelBridge struct {
 func NewTunnelBridge() services.Service {
 	return &TunnelBridge{
 		cfg:                TunnelBridgeArgs{},
-		serverConns:        utils.NewConcurrentMap(),
-		clientControlConns: utils.NewConcurrentMap(),
+		serverConns:        mapx.NewConcurrentMap(),
+		clientControlConns: mapx.NewConcurrentMap(),
 		isStop:             false,
 	}
 }
@ -72,6 +74,11 @@ func (s *TunnelBridge) StopService() {
 		} else {
 			s.log.Printf("service tbridge stoped")
 		}
+		s.cfg = TunnelBridgeArgs{}
+		s.clientControlConns = nil
+		s.log = nil
+		s.serverConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	for _, sess := range s.clientControlConns.Items() {
@ -92,9 +99,9 @@ func (s *TunnelBridge) Start(args interface{}, log *logger.Logger) (err error) {
 	}
 	host, port, _ := net.SplitHostPort(*s.cfg.Local)
 	p, _ := strconv.Atoi(port)
-	sc := utils.NewServerChannel(host, p, s.log)
+	sc := server.NewServerChannel(host, p, s.log)

-	err = sc.ListenTls(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.callback)
+	err = sc.ListenTLS(s.cfg.CertBytes, s.cfg.KeyBytes, nil, s.callback)
 	if err != nil {
 		return
 	}
@ -124,10 +131,24 @@ func (s *TunnelBridge) callback(inConn net.Conn) {
 		s.log.Printf("mux server conn accept error,ERR:%s", err)
 		return
 	}
-
+	go func() {
+		defer func() {
+			_ = recover()
+		}()
+		timer := time.NewTicker(time.Second * 3)
+		for {
+			<-timer.C
+			if sess.NumStreams() == 0 {
+				sess.Close()
+				timer.Stop()
+				return
+			}
+		}
+	}()
 	var buf = make([]byte, 1024)
 	n, _ := inConn.Read(buf)
 	reader := bytes.NewReader(buf[:n])
+
 	//reader := bufio.NewReader(inConn)

 	var connType uint8
@ -164,7 +185,7 @@ func (s *TunnelBridge) callback(inConn net.Conn) {
 			(*item.(*net.Conn)).SetWriteDeadline(time.Now().Add(time.Second * 3))
 			_, err := (*item.(*net.Conn)).Write(packet)
 			(*item.(*net.Conn)).SetWriteDeadline(time.Time{})
-			if err != nil {
+			if err != nil && strings.Contains(err.Error(), "stream closed") {
 				s.log.Printf("%s client control conn write signal fail, err: %s, retrying...", key, err)
 				time.Sleep(time.Second * 3)
 				continue
--- a/services/tunnel/tunnel_client.go
+++ b/services/tunnel/tunnel_client.go
@ -7,19 +7,19 @@ import (
 	logger "log"
 	"net"
 	"os"
+	"runtime/debug"
+	"strings"
 	"time"

 	"github.com/snail007/goproxy/services"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/jumper"
+	"github.com/snail007/goproxy/utils/mapx"
+
 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
 )

-const (
-	CONN_SERVER_MUX = uint8(6)
-	CONN_CLIENT_MUX = uint8(7)
-)
-
 type TunnelClientArgs struct {
 	Parent    *string
 	CertFile  *string
@ -28,25 +28,38 @@ type TunnelClientArgs struct {
 	KeyBytes  []byte
 	Key       *string
 	Timeout   *int
-	Mux       *bool
+	Jumper    *string
+}
+type ClientUDPConnItem struct {
+	conn      *net.Conn
+	isActive  bool
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	udpConn   *net.UDPConn
+	connid    string
 }
 type TunnelClient struct {
 	cfg       TunnelClientArgs
-	ctrlConn  net.Conn
+	ctrlConn  *net.Conn
 	isStop    bool
-	userConns utils.ConcurrentMap
+	userConns mapx.ConcurrentMap
 	log       *logger.Logger
+	jumper    *jumper.Jumper
+	udpConns  mapx.ConcurrentMap
 }

 func NewTunnelClient() services.Service {
 	return &TunnelClient{
 		cfg:       TunnelClientArgs{},
-		userConns: utils.NewConcurrentMap(),
+		userConns: mapx.NewConcurrentMap(),
 		isStop:    false,
+		udpConns:  mapx.NewConcurrentMap(),
 	}
 }

 func (s *TunnelClient) InitService() (err error) {
+	s.UDPGCDeamon()
 	return
 }

@ -62,6 +75,18 @@ func (s *TunnelClient) CheckArgs() (err error) {
 		return
 	}
 	s.cfg.CertBytes, s.cfg.KeyBytes, err = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
+	if err != nil {
+		return
+	}
+	if *s.cfg.Jumper != "" {
+		var j jumper.Jumper
+		j, err = jumper.New(*s.cfg.Jumper, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err != nil {
+			err = fmt.Errorf("parse jumper fail, err %s", err)
+			return
+		}
+		s.jumper = &j
+	}
 	return
 }
 func (s *TunnelClient) StopService() {
@ -72,10 +97,17 @@ func (s *TunnelClient) StopService() {
 		} else {
 			s.log.Printf("service tclient stoped")
 		}
+		s.cfg = TunnelClientArgs{}
+		s.ctrlConn = nil
+		s.jumper = nil
+		s.log = nil
+		s.udpConns = nil
+		s.userConns = nil
+		s = nil
 	}()
 	s.isStop = true
 	if s.ctrlConn != nil {
-		s.ctrlConn.Close()
+		(*s.ctrlConn).Close()
 	}
 	for _, c := range s.userConns.Items() {
 		(*c.(*net.Conn)).Close()
@ -97,38 +129,50 @@ func (s *TunnelClient) Start(args interface{}, log *logger.Logger) (err error) {
 			return
 		}
 		if s.ctrlConn != nil {
-			s.ctrlConn.Close()
+			(*s.ctrlConn).Close()
 		}
-
-		s.ctrlConn, err = s.GetInConn(CONN_CLIENT_CONTROL, *s.cfg.Key)
+		var c net.Conn
+		c, err = s.GetInConn(CONN_CLIENT_CONTROL, *s.cfg.Key)
 		if err != nil {
 			s.log.Printf("control connection err: %s, retrying...", err)
 			time.Sleep(time.Second * 3)
-			if s.ctrlConn != nil {
-				s.ctrlConn.Close()
-			}
 			continue
 		}
+		s.ctrlConn = &c
 		for {
 			if s.isStop {
 				return
 			}
 			var ID, clientLocalAddr, serverID string
-			err = utils.ReadPacketData(s.ctrlConn, &ID, &clientLocalAddr, &serverID)
+			err = utils.ReadPacketData(*s.ctrlConn, &ID, &clientLocalAddr, &serverID)
 			if err != nil {
 				if s.ctrlConn != nil {
-					s.ctrlConn.Close()
+					(*s.ctrlConn).Close()
 				}
 				s.log.Printf("read connection signal err: %s, retrying...", err)
 				break
 			}
-			s.log.Printf("signal revecived:%s %s %s", serverID, ID, clientLocalAddr)
+			//s.log.Printf("signal revecived:%s %s %s", serverID, ID, clientLocalAddr)
 			protocol := clientLocalAddr[:3]
 			localAddr := clientLocalAddr[4:]
 			if protocol == "udp" {
-				go s.ServeUDP(localAddr, ID, serverID)
+				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+						}
+					}()
+					s.ServeUDP(localAddr, ID, serverID)
+				}()
 			} else {
-				go s.ServeConn(localAddr, ID, serverID)
+				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+						}
+					}()
+					s.ServeConn(localAddr, ID, serverID)
+				}()
 			}
 		}
 	}
@ -151,11 +195,25 @@ func (s *TunnelClient) GetInConn(typ uint8, data ...string) (outConn net.Conn, e
 	return
 }
 func (s *TunnelClient) GetConn() (conn net.Conn, err error) {
-	var _conn tls.Conn
-	_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+	if s.jumper == nil {
+		var _conn tls.Conn
+		_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+		if err == nil {
+			conn = net.Conn(&_conn)
+		}
+	} else {
+		conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+		if err != nil {
+			return nil, err
+		}
+		var _c net.Conn
+		_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err == nil {
+			conn = net.Conn(tls.Client(_c, conf))
+		}
+	}
 	if err == nil {
-		conn = net.Conn(&_conn)
-		c, e := smux.Client(conn, &smux.Config{
+		sess, e := smux.Client(conn, &smux.Config{
 			AcceptBacklog:          256,
 			EnableKeepAlive:        true,
 			KeepAliveInterval:      9 * time.Second,
@ -168,12 +226,26 @@ func (s *TunnelClient) GetConn() (conn net.Conn, err error) {
 			err = e
 			return
 		}
-		conn, e = c.OpenStream()
+		conn, e = sess.OpenStream()
 		if e != nil {
 			s.log.Printf("mux client conn open stream error,ERR:%s", e)
 			err = e
 			return
 		}
+		go func() {
+			defer func() {
+				_ = recover()
+			}()
+			timer := time.NewTicker(time.Second * 3)
+			for {
+				<-timer.C
+				if sess.NumStreams() == 0 {
+					sess.Close()
+					timer.Stop()
+					return
+				}
+			}
+		}()
 	}
 	return
 }
@ -201,62 +273,141 @@ func (s *TunnelClient) ServeUDP(localAddr, ID, serverID string) {
 	}
 	// s.cm.Add(*s.cfg.Key, ID, &inConn)
 	s.log.Printf("conn %s created", ID)
-
+	var item *ClientUDPConnItem
+	var body []byte
+	srcAddr := ""
+	defer func() {
+		if item != nil {
+			(*(*item).conn).Close()
+			(*item).udpConn.Close()
+			s.udpConns.Remove(srcAddr)
+			inConn.Close()
+		}
+	}()
 	for {
 		if s.isStop {
 			return
 		}
-		srcAddr, body, err := utils.ReadUDPPacket(inConn)
-		if err == io.EOF || err == io.ErrUnexpectedEOF {
-			s.log.Printf("connection %s released", ID)
-			utils.CloseConn(&inConn)
-			break
-		} else if err != nil {
-			s.log.Printf("udp packet revecived fail, err: %s", err)
-		} else {
-			//s.log.Printf("udp packet revecived:%s,%v", srcAddr, body)
-			go s.processUDPPacket(&inConn, srcAddr, localAddr, body)
+		srcAddr, body, err = utils.ReadUDPPacket(inConn)
+		if err != nil {
+			if strings.Contains(err.Error(), "n != int(") {
+				continue
+			}
+			if !utils.IsNetDeadlineErr(err) && err != io.EOF {
+				s.log.Printf("udp packet revecived from bridge fail, err: %s", err)
+			}
+			return
 		}
-
+		if v, ok := s.udpConns.Get(srcAddr); !ok {
+			_srcAddr, _ := net.ResolveUDPAddr("udp", srcAddr)
+			zeroAddr, _ := net.ResolveUDPAddr("udp", ":")
+			_localAddr, _ := net.ResolveUDPAddr("udp", localAddr)
+			c, err := net.DialUDP("udp", zeroAddr, _localAddr)
+			if err != nil {
+				s.log.Printf("create local udp conn fail, err : %s", err)
+				inConn.Close()
+				return
+			}
+			item = &ClientUDPConnItem{
+				conn:      &inConn,
+				srcAddr:   _srcAddr,
+				localAddr: _localAddr,
+				udpConn:   c,
+				connid:    ID,
+			}
+			s.udpConns.Set(srcAddr, item)
+			s.UDPRevecive(srcAddr, ID)
+		} else {
+			item = v.(*ClientUDPConnItem)
+		}
+		(*item).touchtime = time.Now().Unix()
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+				}
+			}()
+			(*item).udpConn.Write(body)
+		}()
 	}
-	// }
 }
-func (s *TunnelClient) processUDPPacket(inConn *net.Conn, srcAddr, localAddr string, body []byte) {
-	dstAddr, err := net.ResolveUDPAddr("udp", localAddr)
-	if err != nil {
-		s.log.Printf("can't resolve address: %s", err)
-		utils.CloseConn(inConn)
-		return
-	}
-	clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-	conn, err := net.DialUDP("udp", clientSrcAddr, dstAddr)
-	if err != nil {
-		s.log.Printf("connect to udp %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-	_, err = conn.Write(body)
-	if err != nil {
-		s.log.Printf("send udp packet to %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	//s.log.Printf("send udp packet to %s success", dstAddr.String())
-	buf := make([]byte, 1024)
-	length, _, err := conn.ReadFromUDP(buf)
-	if err != nil {
-		s.log.Printf("read udp response from %s fail ,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	respBody := buf[0:length]
-	//s.log.Printf("revecived udp packet from %s , %v", dstAddr.String(), respBody)
-	bs := utils.UDPPacket(srcAddr, respBody)
-	_, err = (*inConn).Write(bs)
-	if err != nil {
-		s.log.Printf("send udp response fail ,ERR:%s", err)
-		utils.CloseConn(inConn)
-		return
-	}
-	//s.log.Printf("send udp response success ,from:%s ,%d ,%v", dstAddr.String(), len(bs), bs)
+func (s *TunnelClient) UDPRevecive(key, ID string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", ID)
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s, connid : %s", key, ID)
+			return
+		}
+		cui := v.(*ClientUDPConnItem)
+		buf := utils.LeakyBuffer.Get()
+		defer func() {
+			utils.LeakyBuffer.Put(buf)
+			(*cui.conn).Close()
+			cui.udpConn.Close()
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", ID)
+		}()
+		for {
+			n, err := cui.udpConn.Read(buf)
+			if err != nil {
+				if !utils.IsNetClosedErr(err) {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			cui.touchtime = time.Now().Unix()
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+					}
+				}()
+				(*cui.conn).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+				_, err = (*cui.conn).Write(utils.UDPPacket(cui.srcAddr.String(), buf[:n]))
+				(*cui.conn).SetWriteDeadline(time.Time{})
+				if err != nil {
+					cui.udpConn.Close()
+					return
+				}
+			}()
+		}
+	}()
+}
+func (s *TunnelClient) UDPGCDeamon() {
+	gctime := int64(30)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
+		for {
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*ClientUDPConnItem).touchtime > gctime {
+					(*(v.(*ClientUDPConnItem).conn)).Close()
+					(v.(*ClientUDPConnItem).udpConn).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", v.(*ClientUDPConnItem).connid)
+				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
+			}
+			gcKeys = nil
+		}
+	}()
 }
 func (s *TunnelClient) ServeConn(localAddr, ID, serverID string) {
 	var inConn, outConn net.Conn
--- a/services/tunnel/tunnel_server.go
+++ b/services/tunnel/tunnel_server.go
@ -12,8 +12,11 @@ import (
 	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/cs/server"
 	"github.com/snail007/goproxy/services"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/jumper"
+	"github.com/snail007/goproxy/utils/mapx"

 	//"github.com/xtaci/smux"
 	smux "github.com/hashicorp/yamux"
@ -32,16 +35,21 @@ type TunnelServerArgs struct {
 	Timeout   *int
 	Route     *[]string
 	Mgr       *TunnelServerManager
-	Mux       *bool
+	Jumper    *string
 }
-type UDPItem struct {
-	packet    *[]byte
-	localAddr *net.UDPAddr
-	srcAddr   *net.UDPAddr
+type TunnelServer struct {
+	cfg       TunnelServerArgs
+	sc        server.ServerChannel
+	isStop    bool
+	udpConn   *net.Conn
+	userConns mapx.ConcurrentMap
+	log       *logger.Logger
+	jumper    *jumper.Jumper
+	udpConns  mapx.ConcurrentMap
 }
+
 type TunnelServerManager struct {
 	cfg      TunnelServerArgs
-	udpChn   chan UDPItem
 	serverID string
 	servers  []*services.Service
 	log      *logger.Logger
@ -50,7 +58,6 @@ type TunnelServerManager struct {
 func NewTunnelServerManager() services.Service {
 	return &TunnelServerManager{
 		cfg:      TunnelServerArgs{},
-		udpChn:   make(chan UDPItem, 50000),
 		serverID: utils.Uniqueid(),
 		servers:  []*services.Service{},
 	}
@ -105,6 +112,7 @@ func (s *TunnelServerManager) Start(args interface{}, log *logger.Logger) (err e
 			Key:       &KEY,
 			Timeout:   s.cfg.Timeout,
 			Mgr:       s,
+			Jumper:    s.cfg.Jumper,
 		}, log)

 		if err != nil {
@ -121,6 +129,11 @@ func (s *TunnelServerManager) StopService() {
 	for _, server := range s.servers {
 		(*server).Clean()
 	}
+	s.cfg = TunnelServerArgs{}
+	s.log = nil
+	s.serverID = ""
+	s.servers = nil
+	s = nil
 }
 func (s *TunnelServerManager) CheckArgs() (err error) {
 	if *s.cfg.CertFile == "" || *s.cfg.KeyFile == "" {
@ -134,49 +147,29 @@ func (s *TunnelServerManager) InitService() (err error) {
 	return
 }

-func (s *TunnelServerManager) GetOutConn(typ uint8) (outConn net.Conn, ID string, err error) {
-	outConn, err = s.GetConn()
-	if err != nil {
-		s.log.Printf("connection err: %s", err)
-		return
-	}
-	ID = s.serverID
-	_, err = outConn.Write(utils.BuildPacket(typ, s.serverID))
-	if err != nil {
-		s.log.Printf("write connection data err: %s ,retrying...", err)
-		utils.CloseConn(&outConn)
-		return
-	}
-	return
-}
-func (s *TunnelServerManager) GetConn() (conn net.Conn, err error) {
-	var _conn tls.Conn
-	_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
-	if err == nil {
-		conn = net.Conn(&_conn)
-	}
-	return
-}
-
-type TunnelServer struct {
-	cfg       TunnelServerArgs
-	udpChn    chan UDPItem
-	sc        utils.ServerChannel
-	isStop    bool
-	udpConn   *net.Conn
-	userConns utils.ConcurrentMap
-	log       *logger.Logger
-}
-
 func NewTunnelServer() services.Service {
 	return &TunnelServer{
 		cfg:       TunnelServerArgs{},
-		udpChn:    make(chan UDPItem, 50000),
 		isStop:    false,
-		userConns: utils.NewConcurrentMap(),
+		userConns: mapx.NewConcurrentMap(),
+		udpConns:  mapx.NewConcurrentMap(),
 	}
 }

+type TunnelUDPPacketItem struct {
+	packet    *[]byte
+	localAddr *net.UDPAddr
+	srcAddr   *net.UDPAddr
+}
+type TunnelUDPConnItem struct {
+	conn      *net.Conn
+	isActive  bool
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	connid    string
+}
+
 func (s *TunnelServer) StopService() {
 	defer func() {
 		e := recover()
@ -185,6 +178,14 @@ func (s *TunnelServer) StopService() {
 		} else {
 			s.log.Printf("service server stoped")
 		}
+		s.cfg = TunnelServerArgs{}
+		s.jumper = nil
+		s.log = nil
+		s.sc = server.ServerChannel{}
+		s.udpConn = nil
+		s.udpConns = nil
+		s.userConns = nil
+		s = nil
 	}()
 	s.isStop = true

@ -202,7 +203,7 @@ func (s *TunnelServer) StopService() {
 	}
 }
 func (s *TunnelServer) InitService() (err error) {
-	s.UDPConnDeamon()
+	s.UDPGCDeamon()
 	return
 }
 func (s *TunnelServer) CheckArgs() (err error) {
@ -210,6 +211,15 @@ func (s *TunnelServer) CheckArgs() (err error) {
 		err = fmt.Errorf("remote required")
 		return
 	}
+	if *s.cfg.Jumper != "" {
+		var j jumper.Jumper
+		j, err = jumper.New(*s.cfg.Jumper, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err != nil {
+			err = fmt.Errorf("parse jumper fail, err %s", err)
+			return
+		}
+		s.jumper = &j
+	}
 	return
 }

@ -224,14 +234,10 @@ func (s *TunnelServer) Start(args interface{}, log *logger.Logger) (err error) {
 	}
 	host, port, _ := net.SplitHostPort(*s.cfg.Local)
 	p, _ := strconv.Atoi(port)
-	s.sc = utils.NewServerChannel(host, p, s.log)
+	s.sc = server.NewServerChannel(host, p, s.log)
 	if *s.cfg.IsUDP {
-		err = s.sc.ListenUDP(func(packet []byte, localAddr, srcAddr *net.UDPAddr) {
-			s.udpChn <- UDPItem{
-				packet:    &packet,
-				localAddr: localAddr,
-				srcAddr:   srcAddr,
-			}
+		err = s.sc.ListenUDP(func(listener *net.UDPConn, packet []byte, localAddr, srcAddr *net.UDPAddr) {
+			s.UDPSend(packet, localAddr, srcAddr)
 		})
 		if err != nil {
 			return
@ -301,11 +307,26 @@ func (s *TunnelServer) GetOutConn(typ uint8) (outConn net.Conn, ID string, err e
 	return
 }
 func (s *TunnelServer) GetConn() (conn net.Conn, err error) {
-	var _conn tls.Conn
-	_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+	var dconn net.Conn
+	if s.jumper == nil {
+		var _conn tls.Conn
+		_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+		if err == nil {
+			dconn = net.Conn(&_conn)
+		}
+	} else {
+		conf, err := utils.TlsConfig(s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+		if err != nil {
+			return nil, err
+		}
+		var _c net.Conn
+		_c, err = s.jumper.Dial(*s.cfg.Parent, time.Millisecond*time.Duration(*s.cfg.Timeout))
+		if err == nil {
+			dconn = net.Conn(tls.Client(_c, conf))
+		}
+	}
 	if err == nil {
-		conn = net.Conn(&_conn)
-		c, e := smux.Client(conn, &smux.Config{
+		sess, e := smux.Client(dconn, &smux.Config{
 			AcceptBacklog:          256,
 			EnableKeepAlive:        true,
 			KeepAliveInterval:      9 * time.Second,
@ -316,100 +337,147 @@ func (s *TunnelServer) GetConn() (conn net.Conn, err error) {
 		if e != nil {
 			s.log.Printf("new mux client conn error,ERR:%s", e)
 			err = e
+			dconn.Close()
 			return
 		}
-		conn, e = c.OpenStream()
+		conn, e = sess.OpenStream()
 		if e != nil {
 			s.log.Printf("mux client conn open stream error,ERR:%s", e)
 			err = e
+			dconn.Close()
 			return
 		}
+		go func() {
+			defer func() {
+				_ = recover()
+			}()
+			timer := time.NewTicker(time.Second * 3)
+			for {
+				<-timer.C
+				if sess.NumStreams() == 0 {
+					sess.Close()
+					timer.Stop()
+					return
+				}
+			}
+		}()
 	}
 	return
 }
-func (s *TunnelServer) UDPConnDeamon() {
+func (s *TunnelServer) UDPGCDeamon() {
+	gctime := int64(30)
 	go func() {
 		defer func() {
-			if err := recover(); err != nil {
-				s.log.Printf("udp conn deamon crashed with err : %s \nstack: %s", err, string(debug.Stack()))
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
 			}
 		}()
-		var outConn net.Conn
-		// var hb utils.HeartbeatReadWriter
-		var ID string
-		// var cmdChn = make(chan bool, 1000)
-		var err error
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
 		for {
-			if s.isStop {
-				return
-			}
-			item := <-s.udpChn
-		RETRY:
-			if s.isStop {
-				return
-			}
-			if outConn == nil {
-				for {
-					if s.isStop {
-						return
-					}
-					outConn, ID, err = s.GetOutConn(CONN_SERVER)
-					if err != nil {
-						// cmdChn <- true
-						outConn = nil
-						utils.CloseConn(&outConn)
-						s.log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, err)
-						time.Sleep(time.Second * 3)
-						continue
-					} else {
-						go func(outConn net.Conn, ID string) {
-							if s.udpConn != nil {
-								(*s.udpConn).Close()
-							}
-							s.udpConn = &outConn
-							for {
-								if s.isStop {
-									return
-								}
-								srcAddrFromConn, body, err := utils.ReadUDPPacket(outConn)
-								if err == io.EOF || err == io.ErrUnexpectedEOF {
-									s.log.Printf("UDP deamon connection %s exited", ID)
-									break
-								}
-								if err != nil {
-									s.log.Printf("parse revecived udp packet fail, err: %s ,%v", err, body)
-									continue
-								}
-								//s.log.Printf("udp packet revecived over parent , local:%s", srcAddrFromConn)
-								_srcAddr := strings.Split(srcAddrFromConn, ":")
-								if len(_srcAddr) != 2 {
-									s.log.Printf("parse revecived udp packet fail, addr error : %s", srcAddrFromConn)
-									continue
-								}
-								port, _ := strconv.Atoi(_srcAddr[1])
-								dstAddr := &net.UDPAddr{IP: net.ParseIP(_srcAddr[0]), Port: port}
-								_, err = s.sc.UDPListener.WriteToUDP(body, dstAddr)
-								if err != nil {
-									s.log.Printf("udp response to local %s fail,ERR:%s", srcAddrFromConn, err)
-									continue
-								}
-								//s.log.Printf("udp response to local %s success , %v", srcAddrFromConn, body)
-							}
-						}(outConn, ID)
-						break
-					}
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*TunnelUDPConnItem).touchtime > gctime {
+					(*(v.(*TunnelUDPConnItem).conn)).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", v.(*TunnelUDPConnItem).connid)
 				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
 			}
-			outConn.SetWriteDeadline(time.Now().Add(time.Second))
-			_, err = outConn.Write(utils.UDPPacket(item.srcAddr.String(), *item.packet))
-			outConn.SetWriteDeadline(time.Time{})
-			if err != nil {
-				utils.CloseConn(&outConn)
-				outConn = nil
-				s.log.Printf("write udp packet to %s fail ,flush err:%s ,retrying...", *s.cfg.Parent, err)
-				goto RETRY
-			}
-			//s.log.Printf("write packet %v", *item.packet)
+			gcKeys = nil
+		}
+	}()
+}
+func (s *TunnelServer) UDPSend(data []byte, localAddr, srcAddr *net.UDPAddr) {
+	var (
+		uc      *TunnelUDPConnItem
+		key     = srcAddr.String()
+		ID      string
+		err     error
+		outconn net.Conn
+	)
+	v, ok := s.udpConns.Get(key)
+	if !ok {
+		outconn, ID, err = s.GetOutConn(CONN_SERVER)
+		if err != nil {
+			s.log.Printf("connect to %s fail, err: %s", *s.cfg.Parent, err)
+			return
+		}
+		uc = &TunnelUDPConnItem{
+			conn:      &outconn,
+			srcAddr:   srcAddr,
+			localAddr: localAddr,
+			connid:    ID,
+		}
+		s.udpConns.Set(key, uc)
+		s.UDPRevecive(key, ID)
+	} else {
+		uc = v.(*TunnelUDPConnItem)
+	}
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				(*uc.conn).Close()
+				s.udpConns.Remove(key)
+				s.log.Printf("udp sender crashed with error : %s", e)
+			}
+		}()
+		uc.touchtime = time.Now().Unix()
+		(*uc.conn).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+		_, err = (*uc.conn).Write(utils.UDPPacket(srcAddr.String(), data))
+		(*uc.conn).SetWriteDeadline(time.Time{})
+		if err != nil {
+			s.log.Printf("write udp packet to %s fail ,flush err:%s ", *s.cfg.Parent, err)
+		}
+	}()
+}
+func (s *TunnelServer) UDPRevecive(key, ID string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", ID)
+		var uc *TunnelUDPConnItem
+		defer func() {
+			if uc != nil {
+				(*uc.conn).Close()
+			}
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", ID)
+		}()
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s, connid : %s", key, ID)
+			return
+		}
+		uc = v.(*TunnelUDPConnItem)
+		for {
+			_, body, err := utils.ReadUDPPacket(*uc.conn)
+			if err != nil {
+				if strings.Contains(err.Error(), "n != int(") {
+					continue
+				}
+				if err != io.EOF {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			uc.touchtime = time.Now().Unix()
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+					}
+				}()
+				s.sc.UDPListener.WriteToUDP(body, uc.srcAddr)
+			}()
 		}
 	}()
 }
--- a/services/udp/udp.go
+++ b/services/udp/udp.go
@ -1,9 +1,8 @@
 package udp

 import (
-	"bufio"
+	"crypto/tls"
 	"fmt"
-	"hash/crc32"
 	"io"
 	logger "log"
 	"net"
@ -12,9 +11,10 @@ import (
 	"strings"
 	"time"

+	"github.com/snail007/goproxy/core/cs/server"
 	"github.com/snail007/goproxy/services"
-	"github.com/snail007/goproxy/services/kcpcfg"
 	"github.com/snail007/goproxy/utils"
+	"github.com/snail007/goproxy/utils/mapx"
 )

 type UDPArgs struct {
@ -29,28 +29,44 @@ type UDPArgs struct {
 	CheckParentInterval *int
 }
 type UDP struct {
-	p       utils.ConcurrentMap
-	outPool utils.OutConn
-	cfg     UDPArgs
-	sc      *utils.ServerChannel
-	isStop  bool
-	log     *logger.Logger
+	p                mapx.ConcurrentMap
+	cfg              UDPArgs
+	sc               *server.ServerChannel
+	isStop           bool
+	log              *logger.Logger
+	outUDPConnCtxMap mapx.ConcurrentMap
+	udpConns         mapx.ConcurrentMap
+	dstAddr          *net.UDPAddr
+}
+type UDPConnItem struct {
+	conn      *net.Conn
+	touchtime int64
+	srcAddr   *net.UDPAddr
+	localAddr *net.UDPAddr
+	connid    string
+}
+type outUDPConnCtx struct {
+	localAddr *net.UDPAddr
+	srcAddr   *net.UDPAddr
+	udpconn   *net.UDPConn
+	touchtime int64
 }

 func NewUDP() services.Service {
 	return &UDP{
-		outPool: utils.OutConn{},
-		p:       utils.NewConcurrentMap(),
-		isStop:  false,
+		p:                mapx.NewConcurrentMap(),
+		isStop:           false,
+		outUDPConnCtxMap: mapx.NewConcurrentMap(),
+		udpConns:         mapx.NewConcurrentMap(),
 	}
 }
 func (s *UDP) CheckArgs() (err error) {
-	if *s.cfg.Parent == "" {
+	if len(*s.cfg.Parent) == 0 {
 		err = fmt.Errorf("parent required for udp %s", *s.cfg.Local)
 		return
 	}
 	if *s.cfg.ParentType == "" {
-		err = fmt.Errorf("parent type unkown,use -T <tls|tcp>")
+		err = fmt.Errorf("parent type unkown,use -T <udp|tls|tcp>")
 		return
 	}
 	if *s.cfg.ParentType == "tls" {
@ -59,12 +75,17 @@ func (s *UDP) CheckArgs() (err error) {
 			return
 		}
 	}
+
+	s.dstAddr, err = net.ResolveUDPAddr("udp", *s.cfg.Parent)
+	if err != nil {
+		s.log.Printf("resolve udp addr %s fail  fail,ERR:%s", *s.cfg.Parent, err)
+		return
+	}
 	return
 }
 func (s *UDP) InitService() (err error) {
-	if *s.cfg.ParentType != "udp" {
-		s.InitOutConnPool()
-	}
+	s.OutToUDPGCDeamon()
+	s.UDPGCDeamon()
 	return
 }
 func (s *UDP) StopService() {
@ -75,6 +96,11 @@ func (s *UDP) StopService() {
 		} else {
 			s.log.Printf("service udp stoped")
 		}
+		s.cfg = UDPArgs{}
+		s.log = nil
+		s.p = nil
+		s.sc = nil
+		s = nil
 	}()
 	s.isStop = true
 	if s.sc.Listener != nil && *s.sc.Listener != nil {
@ -96,7 +122,7 @@ func (s *UDP) Start(args interface{}, log *logger.Logger) (err error) {
 	}
 	host, port, _ := net.SplitHostPort(*s.cfg.Local)
 	p, _ := strconv.Atoi(port)
-	sc := utils.NewServerChannel(host, p, s.log)
+	sc := server.NewServerChannel(host, p, s.log)
 	s.sc = &sc
 	err = sc.ListenUDP(s.callback)
 	if err != nil {
@ -109,32 +135,26 @@ func (s *UDP) Start(args interface{}, log *logger.Logger) (err error) {
 func (s *UDP) Clean() {
 	s.StopService()
 }
-func (s *UDP) callback(packet []byte, localAddr, srcAddr *net.UDPAddr) {
+func (s *UDP) callback(listener *net.UDPConn, packet []byte, localAddr, srcAddr *net.UDPAddr) {
 	defer func() {
 		if err := recover(); err != nil {
 			s.log.Printf("udp conn handler crashed with err : %s \nstack: %s", err, string(debug.Stack()))
 		}
 	}()
-	var err error
 	switch *s.cfg.ParentType {
-	case "tcp":
-		fallthrough
-	case "tls":
-		err = s.OutToTCP(packet, localAddr, srcAddr)
+	case "tcp", "tls":
+		s.OutToTCP(packet, localAddr, srcAddr)
 	case "udp":
-		err = s.OutToUDP(packet, localAddr, srcAddr)
+		s.OutToUDP(packet, localAddr, srcAddr)
 	default:
-		err = fmt.Errorf("unkown parent type %s", *s.cfg.ParentType)
-	}
-	if err != nil {
-		s.log.Printf("connect to %s parent %s fail, ERR:%s", *s.cfg.ParentType, *s.cfg.Parent, err)
+		s.log.Printf("unkown parent type %s", *s.cfg.ParentType)
 	}
 }
 func (s *UDP) GetConn(connKey string) (conn net.Conn, isNew bool, err error) {
 	isNew = !s.p.Has(connKey)
 	var _conn interface{}
 	if isNew {
-		_conn, err = s.outPool.Get()
+		_conn, err = s.GetParentConn()
 		if err != nil {
 			return nil, false, err
 		}
@ -145,117 +165,231 @@ func (s *UDP) GetConn(connKey string) (conn net.Conn, isNew bool, err error) {
 	conn = _conn.(net.Conn)
 	return
 }
-func (s *UDP) OutToTCP(packet []byte, localAddr, srcAddr *net.UDPAddr) (err error) {
-	numLocal := crc32.ChecksumIEEE([]byte(localAddr.String()))
-	numSrc := crc32.ChecksumIEEE([]byte(srcAddr.String()))
-	mod := uint32(10)
-	if mod == 0 {
-		mod = 10
-	}
-	connKey := uint64((numLocal/10)*10 + numSrc%mod)
-	conn, isNew, err := s.GetConn(fmt.Sprintf("%d", connKey))
-	if err != nil {
-		s.log.Printf("upd get conn to %s parent %s fail, ERR:%s", *s.cfg.ParentType, *s.cfg.Parent, err)
-		return
-	}
-	if isNew {
-		go func() {
-			defer func() {
-				if err := recover(); err != nil {
-					s.log.Printf("udp conn handler out to tcp crashed with err : %s \nstack: %s", err, string(debug.Stack()))
-				}
-			}()
-			s.log.Printf("conn %d created , local: %s", connKey, srcAddr.String())
-			for {
-				if s.isStop {
-					conn.Close()
-					return
-				}
-				srcAddrFromConn, body, err := utils.ReadUDPPacket(bufio.NewReader(conn))
-				if err == io.EOF || err == io.ErrUnexpectedEOF {
-					//s.log.Printf("connection %d released", connKey)
-					s.p.Remove(fmt.Sprintf("%d", connKey))
-					break
-				}
-				if err != nil {
-					s.log.Printf("parse revecived udp packet fail, err: %s", err)
-					continue
-				}
-				//s.log.Printf("udp packet revecived over parent , local:%s", srcAddrFromConn)
-				_srcAddr := strings.Split(srcAddrFromConn, ":")
-				if len(_srcAddr) != 2 {
-					s.log.Printf("parse revecived udp packet fail, addr error : %s", srcAddrFromConn)
-					continue
-				}
-				port, _ := strconv.Atoi(_srcAddr[1])
-				dstAddr := &net.UDPAddr{IP: net.ParseIP(_srcAddr[0]), Port: port}
-				_, err = s.sc.UDPListener.WriteToUDP(body, dstAddr)
-				if err != nil {
-					s.log.Printf("udp response to local %s fail,ERR:%s", srcAddr, err)
-					continue
-				}
-				//s.log.Printf("udp response to local %s success", srcAddr)
+func (s *UDP) OutToTCP(data []byte, localAddr, srcAddr *net.UDPAddr) (err error) {
+	s.UDPSend(data, localAddr, srcAddr)
+	return
+}
+func (s *UDP) OutToUDPGCDeamon() {
+	gctime := int64(30)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
 			}
 		}()
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
+		for {
+			<-timer.C
+			gcKeys := []string{}
+			s.outUDPConnCtxMap.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*outUDPConnCtx).touchtime > gctime {
+					(*(v.(*outUDPConnCtx).udpconn)).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s <--> %s", (*v.(*outUDPConnCtx)).srcAddr, (*v.(*outUDPConnCtx)).localAddr)
+				}
+			})
+			for _, k := range gcKeys {
+				s.outUDPConnCtxMap.Remove(k)
+			}
+			gcKeys = nil
+		}
+	}()
+}
+func (s *UDP) OutToUDP(packet []byte, localAddr, srcAddr *net.UDPAddr) {
+	var ouc *outUDPConnCtx
+	if v, ok := s.outUDPConnCtxMap.Get(srcAddr.String()); !ok {
+		clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
+		conn, err := net.DialUDP("udp", clientSrcAddr, s.dstAddr)
+		if err != nil {
+			s.log.Printf("connect to udp %s fail,ERR:%s", s.dstAddr.String(), err)
+
+		}
+		ouc = &outUDPConnCtx{
+			localAddr: localAddr,
+			srcAddr:   srcAddr,
+			udpconn:   conn,
+		}
+		s.outUDPConnCtxMap.Set(srcAddr.String(), ouc)
+		go func() {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+				}
+			}()
+			s.log.Printf("udp conn %s <--> %s connected", srcAddr.String(), localAddr.String())
+			buf := utils.LeakyBuffer.Get()
+			defer func() {
+				utils.LeakyBuffer.Put(buf)
+				s.outUDPConnCtxMap.Remove(srcAddr.String())
+				s.log.Printf("udp conn %s <--> %s released", srcAddr.String(), localAddr.String())
+			}()
+			for {
+				n, err := ouc.udpconn.Read(buf)
+				if err != nil {
+					if !utils.IsNetClosedErr(err) {
+						s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+					}
+					return
+				}
+				ouc.touchtime = time.Now().Unix()
+				go func() {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+						}
+					}()
+					(*(s.sc).UDPListener).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+					_, err = (*(s.sc).UDPListener).WriteTo(buf[:n], srcAddr)
+					(*(s.sc).UDPListener).SetWriteDeadline(time.Time{})
+				}()
+			}
+		}()
+	} else {
+		ouc = v.(*outUDPConnCtx)
 	}
-	//s.log.Printf("select conn %d , local: %s", connKey, srcAddr.String())
-	writer := bufio.NewWriter(conn)
-	//fmt.Println(conn, writer)
-	writer.Write(utils.UDPPacket(srcAddr.String(), packet))
-	err = writer.Flush()
-	if err != nil {
-		s.log.Printf("write udp packet to %s fail ,flush err:%s", *s.cfg.Parent, err)
-		return
-	}
-	//s.log.Printf("write packet %v", packet)
+	go func() {
+		ouc.touchtime = time.Now().Unix()
+		ouc.udpconn.SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+		ouc.udpconn.Write(packet)
+		ouc.udpconn.SetWriteDeadline(time.Time{})
+	}()
 	return
 }
-func (s *UDP) OutToUDP(packet []byte, localAddr, srcAddr *net.UDPAddr) (err error) {
-	//s.log.Printf("udp packet revecived:%s,%v", srcAddr, packet)
-	dstAddr, err := net.ResolveUDPAddr("udp", *s.cfg.Parent)
-	if err != nil {
-		s.log.Printf("resolve udp addr %s fail  fail,ERR:%s", dstAddr.String(), err)
-		return
+func (s *UDP) GetParentConn() (conn net.Conn, err error) {
+	if *s.cfg.ParentType == "tls" {
+		var _conn tls.Conn
+		_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
+		if err == nil {
+			conn = net.Conn(&_conn)
+		}
+	} else {
+		conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
 	}
-	clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
-	conn, err := net.DialUDP("udp", clientSrcAddr, dstAddr)
-	if err != nil {
-		s.log.Printf("connect to udp %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
-	_, err = conn.Write(packet)
-	if err != nil {
-		s.log.Printf("send udp packet to %s fail,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	//s.log.Printf("send udp packet to %s success", dstAddr.String())
-	buf := make([]byte, 512)
-	len, _, err := conn.ReadFromUDP(buf)
-	if err != nil {
-		s.log.Printf("read udp response from %s fail ,ERR:%s", dstAddr.String(), err)
-		return
-	}
-	//s.log.Printf("revecived udp packet from %s , %v", dstAddr.String(), respBody)
-	_, err = s.sc.UDPListener.WriteToUDP(buf[0:len], srcAddr)
-	if err != nil {
-		s.log.Printf("send udp response to cluster fail ,ERR:%s", err)
-		return
-	}
-	//s.log.Printf("send udp response to cluster success ,from:%s", dstAddr.String())
 	return
 }
-func (s *UDP) InitOutConnPool() {
-	if *s.cfg.ParentType == "tls" || *s.cfg.ParentType == "tcp" {
-		//dur int, isTLS bool, certBytes, keyBytes []byte,
-		//parent string, timeout int, InitialCap int, MaxCap int
-		s.outPool = utils.NewOutConn(
-			*s.cfg.CheckParentInterval,
-			*s.cfg.ParentType,
-			kcpcfg.KCPConfigArgs{},
-			s.cfg.CertBytes, s.cfg.KeyBytes, nil,
-			*s.cfg.Parent,
-			*s.cfg.Timeout,
-		)
-	}
+func (s *UDP) UDPGCDeamon() {
+	gctime := int64(30)
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+			}
+		}()
+		if s.isStop {
+			return
+		}
+		timer := time.NewTicker(time.Second)
+		for {
+			<-timer.C
+			gcKeys := []string{}
+			s.udpConns.IterCb(func(key string, v interface{}) {
+				if time.Now().Unix()-v.(*UDPConnItem).touchtime > gctime {
+					(*(v.(*UDPConnItem).conn)).Close()
+					gcKeys = append(gcKeys, key)
+					s.log.Printf("gc udp conn %s", v.(*UDPConnItem).connid)
+				}
+			})
+			for _, k := range gcKeys {
+				s.udpConns.Remove(k)
+			}
+			gcKeys = nil
+		}
+	}()
+}
+func (s *UDP) UDPSend(data []byte, localAddr, srcAddr *net.UDPAddr) {
+	var (
+		uc      *UDPConnItem
+		key     = srcAddr.String()
+		err     error
+		outconn net.Conn
+	)
+	v, ok := s.udpConns.Get(key)
+	if !ok {
+		for {
+			outconn, err = s.GetParentConn()
+			if err != nil && strings.Contains(err.Error(), "can not connect at same time") {
+				time.Sleep(time.Millisecond * 500)
+				continue
+			} else {
+				break
+			}
+		}
+		if err != nil {
+			s.log.Printf("connect to %s fail, err: %s", *s.cfg.Parent, err)
+			return
+		}
+		uc = &UDPConnItem{
+			conn:      &outconn,
+			srcAddr:   srcAddr,
+			localAddr: localAddr,
+		}
+		s.udpConns.Set(key, uc)
+		s.UDPRevecive(key)
+	} else {
+		uc = v.(*UDPConnItem)
+	}
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				(*uc.conn).Close()
+				s.udpConns.Remove(key)
+				s.log.Printf("udp sender crashed with error : %s", e)
+			}
+		}()
+		uc.touchtime = time.Now().Unix()
+		(*uc.conn).SetWriteDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
+		_, err = (*uc.conn).Write(utils.UDPPacket(fmt.Sprintf("%s", srcAddr.String()), data))
+		(*uc.conn).SetWriteDeadline(time.Time{})
+		if err != nil {
+			s.log.Printf("write udp packet to %s fail ,flush err:%s ", *s.cfg.Parent, err)
+		}
+	}()
+}
+func (s *UDP) UDPRevecive(key string) {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+			}
+		}()
+		s.log.Printf("udp conn %s connected", key)
+		var uc *UDPConnItem
+		defer func() {
+			if uc != nil {
+				(*uc.conn).Close()
+			}
+			s.udpConns.Remove(key)
+			s.log.Printf("udp conn %s released", key)
+		}()
+		v, ok := s.udpConns.Get(key)
+		if !ok {
+			s.log.Printf("[warn] udp conn not exists for %s, connid : %s", key)
+			return
+		}
+		uc = v.(*UDPConnItem)
+		for {
+			_, body, err := utils.ReadUDPPacket(*uc.conn)
+			if err != nil {
+				if strings.Contains(err.Error(), "n != int(") {
+					continue
+				}
+				if err != io.EOF && !utils.IsNetClosedErr(err) {
+					s.log.Printf("udp conn read udp packet fail , err: %s ", err)
+				}
+				return
+			}
+			uc.touchtime = time.Now().Unix()
+			go func() {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:", e, string(debug.Stack()))
+					}
+				}()
+				s.sc.UDPListener.WriteToUDP(body, uc.srcAddr)
+			}()
+		}
+	}()
 }
--- a/utils/conncrypt/conncrypt.go
+++ b/utils/conncrypt/conncrypt.go
@ -12,8 +12,8 @@ import (
 )

 //Confg defaults
-const DefaultIterations = 1024
-const DefaultKeySize = 24 //256bits
+const DefaultIterations = 2048
+const DefaultKeySize = 32 //256bits
 var DefaultHashFunc = sha256.New
 var DefaultSalt = []byte(`
 (;QUHj.BQ?RXzYSO]ifkXp/G!kFmWyXyEV6Nt!d|@bo+N$L9+<d$|g6e26T}
--- a/utils/datasize/datasize.go
+++ b/utils/datasize/datasize.go
@ -0,0 +1,235 @@
+package datasize
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type ByteSize uint64
+
+const (
+	B  ByteSize = 1
+	KB          = B << 10
+	MB          = KB << 10
+	GB          = MB << 10
+	TB          = GB << 10
+	PB          = TB << 10
+	EB          = PB << 10
+
+	fnUnmarshalText string = "UnmarshalText"
+	maxUint64       uint64 = (1 << 64) - 1
+	cutoff          uint64 = maxUint64 / 10
+)
+
+var ErrBits = errors.New("unit with capital unit prefix and lower case unit (b) - bits, not bytes ")
+
+var defaultDatasize ByteSize
+
+func Parse(s string) (bytes uint64, err error) {
+	err = defaultDatasize.UnmarshalText([]byte(s))
+	if err != nil {
+		return
+	}
+	bytes = defaultDatasize.Bytes()
+	return
+}
+func HumanSize(bytes uint64) (s string, err error) {
+	err = defaultDatasize.UnmarshalText([]byte(fmt.Sprintf("%d", bytes)))
+	if err != nil {
+		return
+	}
+	s = defaultDatasize.HumanReadable()
+	return
+}
+func (b ByteSize) Bytes() uint64 {
+	return uint64(b)
+}
+
+func (b ByteSize) KBytes() float64 {
+	v := b / KB
+	r := b % KB
+	return float64(v) + float64(r)/float64(KB)
+}
+
+func (b ByteSize) MBytes() float64 {
+	v := b / MB
+	r := b % MB
+	return float64(v) + float64(r)/float64(MB)
+}
+
+func (b ByteSize) GBytes() float64 {
+	v := b / GB
+	r := b % GB
+	return float64(v) + float64(r)/float64(GB)
+}
+
+func (b ByteSize) TBytes() float64 {
+	v := b / TB
+	r := b % TB
+	return float64(v) + float64(r)/float64(TB)
+}
+
+func (b ByteSize) PBytes() float64 {
+	v := b / PB
+	r := b % PB
+	return float64(v) + float64(r)/float64(PB)
+}
+
+func (b ByteSize) EBytes() float64 {
+	v := b / EB
+	r := b % EB
+	return float64(v) + float64(r)/float64(EB)
+}
+
+func (b ByteSize) String() string {
+	switch {
+	case b == 0:
+		return fmt.Sprint("0B")
+	case b%EB == 0:
+		return fmt.Sprintf("%dEB", b/EB)
+	case b%PB == 0:
+		return fmt.Sprintf("%dPB", b/PB)
+	case b%TB == 0:
+		return fmt.Sprintf("%dTB", b/TB)
+	case b%GB == 0:
+		return fmt.Sprintf("%dGB", b/GB)
+	case b%MB == 0:
+		return fmt.Sprintf("%dMB", b/MB)
+	case b%KB == 0:
+		return fmt.Sprintf("%dKB", b/KB)
+	default:
+		return fmt.Sprintf("%dB", b)
+	}
+}
+
+func (b ByteSize) HR() string {
+	return b.HumanReadable()
+}
+
+func (b ByteSize) HumanReadable() string {
+	switch {
+	case b > EB:
+		return fmt.Sprintf("%.1f EB", b.EBytes())
+	case b > PB:
+		return fmt.Sprintf("%.1f PB", b.PBytes())
+	case b > TB:
+		return fmt.Sprintf("%.1f TB", b.TBytes())
+	case b > GB:
+		return fmt.Sprintf("%.1f GB", b.GBytes())
+	case b > MB:
+		return fmt.Sprintf("%.1f MB", b.MBytes())
+	case b > KB:
+		return fmt.Sprintf("%.1f KB", b.KBytes())
+	default:
+		return fmt.Sprintf("%d B", b)
+	}
+}
+
+func (b ByteSize) MarshalText() ([]byte, error) {
+	return []byte(b.String()), nil
+}
+
+func (b *ByteSize) UnmarshalText(t []byte) error {
+	var val uint64
+	var unit string
+
+	// copy for error message
+	t0 := t
+
+	var c byte
+	var i int
+
+ParseLoop:
+	for i < len(t) {
+		c = t[i]
+		switch {
+		case '0' <= c && c <= '9':
+			if val > cutoff {
+				goto Overflow
+			}
+
+			c = c - '0'
+			val *= 10
+
+			if val > val+uint64(c) {
+				// val+v overflows
+				goto Overflow
+			}
+			val += uint64(c)
+			i++
+
+		default:
+			if i == 0 {
+				goto SyntaxError
+			}
+			break ParseLoop
+		}
+	}
+
+	unit = strings.TrimSpace(string(t[i:]))
+	switch unit {
+	case "Kb", "Mb", "Gb", "Tb", "Pb", "Eb":
+		goto BitsError
+	}
+	unit = strings.ToLower(unit)
+	switch unit {
+	case "", "b", "byte":
+		// do nothing - already in bytes
+
+	case "k", "kb", "kilo", "kilobyte", "kilobytes":
+		if val > maxUint64/uint64(KB) {
+			goto Overflow
+		}
+		val *= uint64(KB)
+
+	case "m", "mb", "mega", "megabyte", "megabytes":
+		if val > maxUint64/uint64(MB) {
+			goto Overflow
+		}
+		val *= uint64(MB)
+
+	case "g", "gb", "giga", "gigabyte", "gigabytes":
+		if val > maxUint64/uint64(GB) {
+			goto Overflow
+		}
+		val *= uint64(GB)
+
+	case "t", "tb", "tera", "terabyte", "terabytes":
+		if val > maxUint64/uint64(TB) {
+			goto Overflow
+		}
+		val *= uint64(TB)
+
+	case "p", "pb", "peta", "petabyte", "petabytes":
+		if val > maxUint64/uint64(PB) {
+			goto Overflow
+		}
+		val *= uint64(PB)
+
+	case "E", "EB", "e", "eb", "eB":
+		if val > maxUint64/uint64(EB) {
+			goto Overflow
+		}
+		val *= uint64(EB)
+
+	default:
+		goto SyntaxError
+	}
+
+	*b = ByteSize(val)
+	return nil
+
+Overflow:
+	*b = ByteSize(maxUint64)
+	return &strconv.NumError{fnUnmarshalText, string(t0), strconv.ErrRange}
+
+SyntaxError:
+	*b = 0
+	return &strconv.NumError{fnUnmarshalText, string(t0), strconv.ErrSyntax}
+
+BitsError:
+	*b = 0
+	return &strconv.NumError{fnUnmarshalText, string(t0), ErrBits}
+}
--- a/utils/dnsx/resolver.go
+++ b/utils/dnsx/resolver.go
@ -0,0 +1,114 @@
+package dnsx
+
+import (
+	"fmt"
+	logger "log"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/snail007/goproxy/utils/mapx"
+	dns "github.com/miekg/dns"
+)
+
+type DomainResolver struct {
+	ttl         int
+	dnsAddrress string
+	data        mapx.ConcurrentMap
+	log         *logger.Logger
+}
+type DomainResolverItem struct {
+	ip        string
+	domain    string
+	expiredAt int64
+}
+
+func NewDomainResolver(dnsAddrress string, ttl int, log *logger.Logger) DomainResolver {
+	return DomainResolver{
+		ttl:         ttl,
+		dnsAddrress: dnsAddrress,
+		data:        mapx.NewConcurrentMap(),
+		log:         log,
+	}
+}
+func (a *DomainResolver) DnsAddress() (address string) {
+	address = a.dnsAddrress
+	return
+}
+func (a *DomainResolver) MustResolve(address string) (ip string) {
+	ip, _ = a.Resolve(address)
+	return
+}
+func (a *DomainResolver) Resolve(address string) (ip string, err error) {
+	domain := address
+	port := ""
+	fromCache := "false"
+	defer func() {
+		if port != "" {
+			ip = net.JoinHostPort(ip, port)
+		}
+		a.log.Printf("dns:%s->%s,cache:%s", address, ip, fromCache)
+		//a.PrintData()
+	}()
+	if strings.Contains(domain, ":") {
+		domain, port, err = net.SplitHostPort(domain)
+		if err != nil {
+			return
+		}
+	}
+	if net.ParseIP(domain) != nil {
+		ip = domain
+		fromCache = "ip ignore"
+		return
+	}
+	item, ok := a.data.Get(domain)
+	if ok {
+		//log.Println("find ", domain)
+		if (*item.(*DomainResolverItem)).expiredAt > time.Now().Unix() {
+			ip = (*item.(*DomainResolverItem)).ip
+			fromCache = "true"
+			//log.Println("from cache ", domain)
+			return
+		}
+	} else {
+		item = &DomainResolverItem{
+			domain: domain,
+		}
+
+	}
+	c := new(dns.Client)
+	c.DialTimeout = time.Millisecond * 5000
+	c.ReadTimeout = time.Millisecond * 5000
+	c.WriteTimeout = time.Millisecond * 5000
+	m := new(dns.Msg)
+	m.SetQuestion(dns.Fqdn(domain), dns.TypeA)
+	m.RecursionDesired = true
+	r, _, err := c.Exchange(m, a.dnsAddrress)
+	if r == nil {
+		return
+	}
+	if r.Rcode != dns.RcodeSuccess {
+		err = fmt.Errorf(" *** invalid answer name %s after A query for %s", domain, a.dnsAddrress)
+		return
+	}
+	for _, answer := range r.Answer {
+		if answer.Header().Rrtype == dns.TypeA {
+			info := strings.Fields(answer.String())
+			if len(info) >= 5 {
+				ip = info[4]
+				_item := item.(*DomainResolverItem)
+				(*_item).expiredAt = time.Now().Unix() + int64(a.ttl)
+				(*_item).ip = ip
+				a.data.Set(domain, item)
+				return
+			}
+		}
+	}
+	return
+}
+func (a *DomainResolver) PrintData() {
+	for k, item := range a.data.Items() {
+		d := item.(*DomainResolverItem)
+		a.log.Printf("%s:ip[%s],domain[%s],expired at[%d]\n", k, (*d).ip, (*d).domain, (*d).expiredAt)
+	}
+}
--- a/utils/functions.go
+++ b/utils/functions.go
@ -3,10 +3,13 @@ package utils
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"crypto/sha1"
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/base64"
 	"encoding/binary"
+	"encoding/hex"
 	"encoding/pem"
 	"errors"
 	"fmt"
@ -17,13 +20,15 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"strings"

-	"github.com/snail007/goproxy/services/kcpcfg"
+	"github.com/snail007/goproxy/core/lib/kcpcfg"
+	"github.com/snail007/goproxy/utils/lb"

 	"golang.org/x/crypto/pbkdf2"

 	"strconv"
-	"strings"
+
 	"time"

 	"github.com/snail007/goproxy/utils/id"
@ -32,6 +37,12 @@ import (
 )

 func IoBind(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interface{}), log *logger.Logger) {
+	ioBind(dst, src, fn, log, true)
+}
+func IoBindNoClose(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interface{}), log *logger.Logger) {
+	ioBind(dst, src, fn, log, false)
+}
+func ioBind(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interface{}), log *logger.Logger, close bool) {
 	go func() {
 		defer func() {
 			if err := recover(); err != nil {
@ -67,20 +78,41 @@ func IoBind(dst io.ReadWriteCloser, src io.ReadWriteCloser, fn func(err interfac
 		case err = <-e2:
 			//log.Printf("e2")
 		}
-		src.Close()
-		dst.Close()
+		func() {
+			defer func() {
+				_ = recover()
+			}()
+			if close {
+				src.Close()
+			}
+		}()
+		func() {
+			defer func() {
+				_ = recover()
+			}()
+			if close {
+				dst.Close()
+			}
+		}()
 		if fn != nil {
 			fn(err)
 		}
 	}()
 }
 func ioCopy(dst io.ReadWriter, src io.ReadWriter) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+		}
+	}()
 	buf := LeakyBuffer.Get()
 	defer LeakyBuffer.Put(buf)
 	n := 0
 	for {
 		n, err = src.Read(buf)
 		if n > 0 {
+			if n > len(buf) {
+				n = len(buf)
+			}
 			if _, e := dst.Write(buf[0:n]); e != nil {
 				return e
 			}
@ -107,6 +139,9 @@ func TlsConnect(host string, port, timeout int, certBytes, keyBytes, caCertBytes
 	}
 	return *tls.Client(_conn, conf), err
 }
+func TlsConfig(certBytes, keyBytes, caCertBytes []byte) (conf *tls.Config, err error) {
+	return getRequestTlsConfig(certBytes, keyBytes, caCertBytes)
+}
 func getRequestTlsConfig(certBytes, keyBytes, caCertBytes []byte) (conf *tls.Config, err error) {

 	var cert tls.Certificate
@ -118,6 +153,7 @@ func getRequestTlsConfig(certBytes, keyBytes, caCertBytes []byte) (conf *tls.Con
 	caBytes := certBytes
 	if caCertBytes != nil {
 		caBytes = caCertBytes
+
 	}
 	ok := serverCertPool.AppendCertsFromPEM(caBytes)
 	if !ok {
@ -208,8 +244,13 @@ func CloseConn(conn *net.Conn) {
 		(*conn).Close()
 	}
 }
-func GetAllInterfaceAddr() ([]net.IP, error) {

+var allInterfaceAddrCache []net.IP
+
+func GetAllInterfaceAddr() ([]net.IP, error) {
+	if allInterfaceAddrCache != nil {
+		return allInterfaceAddrCache, nil
+	}
 	ifaces, err := net.Interfaces()
 	if err != nil {
 		return nil, err
@ -250,6 +291,7 @@ func GetAllInterfaceAddr() ([]net.IP, error) {
 		return nil, fmt.Errorf("no address Found, net.InterfaceAddrs: %v", addresses)
 	}
 	//only need first
+	allInterfaceAddrCache = addresses
 	return addresses, nil
 }
 func UDPPacket(srcAddr string, packet []byte) []byte {
@ -300,10 +342,10 @@ func ReadUDPPacket(_reader io.Reader) (srcAddr string, packet []byte, err error)
 	return
 }
 func Uniqueid() string {
-	return xid.New().String()
-	// var src = rand.NewSource(time.Now().UnixNano())
-	// s := fmt.Sprintf("%d", src.Int63())
-	// return s[len(s)-5:len(s)-1] + fmt.Sprintf("%d", uint64(time.Now().UnixNano()))[8:]
+	str := fmt.Sprintf("%d%s", time.Now().UnixNano(), xid.New().String())
+	hash := sha1.New()
+	hash.Write([]byte(str))
+	return hex.EncodeToString(hash.Sum(nil))
 }
 func RandString(strlen int) string {
 	codes := "QWERTYUIOPLKJHGFDSAZXCVBNMabcdefghijklmnopqrstuvwxyz0123456789"
@ -328,15 +370,15 @@ func RandInt(strLen int) int64 {
 	i, _ := strconv.ParseInt(string(data), 10, 64)
 	return i
 }
-func ReadData(r io.Reader) (data string, err error) {
-	var len uint16
+func ReadBytes(r io.Reader) (data []byte, err error) {
+	var len uint64
 	err = binary.Read(r, binary.LittleEndian, &len)
 	if err != nil {
 		return
 	}
 	var n int
-	_data := make([]byte, len)
-	n, err = r.Read(_data)
+	data = make([]byte, len)
+	n, err = r.Read(data)
 	if err != nil {
 		return
 	}
@ -344,9 +386,37 @@ func ReadData(r io.Reader) (data string, err error) {
 		err = fmt.Errorf("error data len")
 		return
 	}
+	return
+}
+func ReadData(r io.Reader) (data string, err error) {
+	_data, err := ReadBytes(r)
+	if err != nil {
+		return
+	}
 	data = string(_data)
 	return
 }
+
+//non typed packet with Bytes
+func ReadPacketBytes(r io.Reader, data ...*[]byte) (err error) {
+	for _, d := range data {
+		*d, err = ReadBytes(r)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+func BuildPacketBytes(data ...[]byte) []byte {
+	pkg := new(bytes.Buffer)
+	for _, d := range data {
+		binary.Write(pkg, binary.LittleEndian, uint64(len(d)))
+		binary.Write(pkg, binary.LittleEndian, d)
+	}
+	return pkg.Bytes()
+}
+
+//non typed packet with string
 func ReadPacketData(r io.Reader, data ...*string) (err error) {
 	for _, d := range data {
 		*d, err = ReadData(r)
@ -356,13 +426,50 @@ func ReadPacketData(r io.Reader, data ...*string) (err error) {
 	}
 	return
 }
-func ReadPacket(r io.Reader, typ *uint8, data ...*string) (err error) {
+func BuildPacketData(data ...string) []byte {
+	pkg := new(bytes.Buffer)
+	for _, d := range data {
+		bytes := []byte(d)
+		binary.Write(pkg, binary.LittleEndian, uint64(len(bytes)))
+		binary.Write(pkg, binary.LittleEndian, bytes)
+	}
+	return pkg.Bytes()
+}
+
+//typed packet with bytes
+func ReadBytesPacket(r io.Reader, packetType *uint8, data ...*[]byte) (err error) {
 	var connType uint8
 	err = binary.Read(r, binary.LittleEndian, &connType)
 	if err != nil {
 		return
 	}
-	*typ = connType
+	*packetType = connType
+	for _, d := range data {
+		*d, err = ReadBytes(r)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+func BuildBytesPacket(packetType uint8, data ...[]byte) []byte {
+	pkg := new(bytes.Buffer)
+	binary.Write(pkg, binary.LittleEndian, packetType)
+	for _, d := range data {
+		binary.Write(pkg, binary.LittleEndian, uint64(len(d)))
+		binary.Write(pkg, binary.LittleEndian, d)
+	}
+	return pkg.Bytes()
+}
+
+//typed packet with string
+func ReadPacket(r io.Reader, packetType *uint8, data ...*string) (err error) {
+	var connType uint8
+	err = binary.Read(r, binary.LittleEndian, &connType)
+	if err != nil {
+		return
+	}
+	*packetType = connType
 	for _, d := range data {
 		*d, err = ReadData(r)
 		if err != nil {
@ -371,25 +478,18 @@ func ReadPacket(r io.Reader, typ *uint8, data ...*string) (err error) {
 	}
 	return
 }
-func BuildPacket(typ uint8, data ...string) []byte {
+
+func BuildPacket(packetType uint8, data ...string) []byte {
 	pkg := new(bytes.Buffer)
-	binary.Write(pkg, binary.LittleEndian, typ)
+	binary.Write(pkg, binary.LittleEndian, packetType)
 	for _, d := range data {
 		bytes := []byte(d)
-		binary.Write(pkg, binary.LittleEndian, uint16(len(bytes)))
-		binary.Write(pkg, binary.LittleEndian, bytes)
-	}
-	return pkg.Bytes()
-}
-func BuildPacketData(data ...string) []byte {
-	pkg := new(bytes.Buffer)
-	for _, d := range data {
-		bytes := []byte(d)
-		binary.Write(pkg, binary.LittleEndian, uint16(len(bytes)))
+		binary.Write(pkg, binary.LittleEndian, uint64(len(bytes)))
 		binary.Write(pkg, binary.LittleEndian, bytes)
 	}
 	return pkg.Bytes()
 }
+
 func SubStr(str string, start, end int) string {
 	if len(str) == 0 {
 		return ""
@ -409,12 +509,21 @@ func SubBytes(bytes []byte, start, end int) []byte {
 	return bytes[start:end]
 }
 func TlsBytes(cert, key string) (certBytes, keyBytes []byte, err error) {
-	certBytes, err = ioutil.ReadFile(cert)
+	base64Prefix := "base64://"
+	if strings.HasPrefix(cert, base64Prefix) {
+		certBytes, err = base64.StdEncoding.DecodeString(cert[len(base64Prefix):])
+	} else {
+		certBytes, err = ioutil.ReadFile(cert)
+	}
 	if err != nil {
 		err = fmt.Errorf("err : %s", err)
 		return
 	}
-	keyBytes, err = ioutil.ReadFile(key)
+	if strings.HasPrefix(key, base64Prefix) {
+		keyBytes, err = base64.StdEncoding.DecodeString(key[len(base64Prefix):])
+	} else {
+		keyBytes, err = ioutil.ReadFile(key)
+	}
 	if err != nil {
 		err = fmt.Errorf("err : %s", err)
 		return
@ -485,7 +594,7 @@ func HttpGet(URL string, timeout int, host ...string) (body []byte, code int, er
 	body, err = ioutil.ReadAll(resp.Body)
 	return
 }
-func IsIternalIP(domainOrIP string, always bool) bool {
+func IsInternalIP(domainOrIP string, always bool) bool {
 	var outIPs []net.IP
 	var err error
 	var isDomain bool
@ -497,7 +606,7 @@ func IsIternalIP(domainOrIP string, always bool) bool {
 	}

 	if isDomain {
-		outIPs, err = net.LookupIP(domainOrIP)
+		outIPs, err = LookupIP(domainOrIP)
 	} else {
 		outIPs = []net.IP{net.ParseIP(domainOrIP)}
 	}
@ -505,6 +614,7 @@ func IsIternalIP(domainOrIP string, always bool) bool {
 	if err != nil {
 		return false
 	}
+
 	for _, ip := range outIPs {
 		if ip.IsLoopback() {
 			return true
@ -512,7 +622,7 @@ func IsIternalIP(domainOrIP string, always bool) bool {
 		if ip.To4().Mask(net.IPv4Mask(255, 0, 0, 0)).String() == "10.0.0.0" {
 			return true
 		}
-		if ip.To4().Mask(net.IPv4Mask(255, 0, 0, 0)).String() == "192.168.0.0" {
+		if ip.To4().Mask(net.IPv4Mask(255, 255, 0, 0)).String() == "192.168.0.0" {
 			return true
 		}
 		if ip.To4().Mask(net.IPv4Mask(255, 0, 0, 0)).String() == "172.0.0.0" {
@ -575,6 +685,63 @@ func RemoveProxyHeaders(head []byte) []byte {
 func InsertProxyHeaders(head []byte, headers string) []byte {
 	return bytes.Replace(head, []byte("\r\n"), []byte("\r\n"+headers), 1)
 }
+func LBMethod(key string) int {
+	typs := map[string]int{"weight": lb.SELECT_WEITHT, "leasttime": lb.SELECT_LEASTTIME, "leastconn": lb.SELECT_LEASTCONN, "hash": lb.SELECT_HASH, "roundrobin": lb.SELECT_ROUNDROBIN}
+	return typs[key]
+}
+func UDPCopy(dst, src *net.UDPConn, dstAddr net.Addr, readTimeout time.Duration, beforeWriteFn func(data []byte) []byte, deferFn func(e interface{})) {
+	go func() {
+		defer func() {
+			deferFn(recover())
+		}()
+		buf := LeakyBuffer.Get()
+		defer LeakyBuffer.Put(buf)
+		for {
+			if readTimeout > 0 {
+				src.SetReadDeadline(time.Now().Add(readTimeout))
+			}
+			n, err := src.Read(buf)
+			if readTimeout > 0 {
+				src.SetReadDeadline(time.Time{})
+			}
+			if err != nil {
+				if IsNetClosedErr(err) || IsNetTimeoutErr(err) || IsNetRefusedErr(err) {
+					return
+				}
+				continue
+			}
+			_, err = dst.WriteTo(beforeWriteFn(buf[:n]), dstAddr)
+			if err != nil {
+				if IsNetClosedErr(err) {
+					return
+				}
+				continue
+			}
+		}
+	}()
+}
+func IsNetClosedErr(err error) bool {
+	return err != nil && strings.Contains(err.Error(), "use of closed network connection")
+}
+func IsNetTimeoutErr(err error) bool {
+	if err == nil {
+		return false
+	}
+	e, ok := err.(net.Error)
+	return ok && e.Timeout()
+}
+func IsNetRefusedErr(err error) bool {
+	return err != nil && strings.Contains(err.Error(), "connection refused")
+}
+func IsNetDeadlineErr(err error) bool {
+	return err != nil && strings.Contains(err.Error(), "i/o deadline reached")
+}
+func IsNetSocketNotConnectedErr(err error) bool {
+	return err != nil && strings.Contains(err.Error(), "socket is not connected")
+}
+func NewDefaultLogger() *logger.Logger {
+	return logger.New(os.Stderr, "", logger.LstdFlags)
+}

 // type sockaddr struct {
 // 	family uint16
@ -632,3 +799,26 @@ func InsertProxyHeaders(head []byte, headers string) []byte {
 // 	}
 // 	return
 // }
+
+/*
+net.LookupIP may cause  deadlock in windows
+https://github.com/golang/go/issues/24178
+*/
+
+func LookupIP(host string) ([]net.IP, error) {
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*time.Duration(3))
+	defer func() {
+		cancel()
+		//ctx.Done()
+	}()
+	addrs, err := net.DefaultResolver.LookupIPAddr(ctx, host)
+	if err != nil {
+		return nil, err
+	}
+	ips := make([]net.IP, len(addrs))
+	for i, ia := range addrs {
+		ips[i] = ia.IP
+	}
+	return ips, nil
+}
--- a/utils/iolimiter/iolimiter.go
+++ b/utils/iolimiter/iolimiter.go
@ -1,8 +1,9 @@
-package utils
+package iolimiter

 import (
 	"context"
 	"io"
+	"net"
 	"time"

 	"golang.org/x/time/rate"
@ -22,6 +23,86 @@ type Writer struct {
 	ctx     context.Context
 }

+type conn struct {
+	net.Conn
+	r            io.Reader
+	w            io.Writer
+	readLimiter  *rate.Limiter
+	writeLimiter *rate.Limiter
+	ctx          context.Context
+}
+
+//NewtRateLimitConn sets rate limit (bytes/sec) to the Conn read and write.
+func NewtConn(c net.Conn, bytesPerSec float64) net.Conn {
+	s := &conn{
+		Conn: c,
+		r:    c,
+		w:    c,
+		ctx:  context.Background(),
+	}
+	s.readLimiter = rate.NewLimiter(rate.Limit(bytesPerSec), burstLimit)
+	s.readLimiter.AllowN(time.Now(), burstLimit) // spend initial burst
+	s.writeLimiter = rate.NewLimiter(rate.Limit(bytesPerSec), burstLimit)
+	s.writeLimiter.AllowN(time.Now(), burstLimit) // spend initial burst
+	return s
+}
+
+//NewtRateLimitReaderConn sets rate limit (bytes/sec) to the Conn read.
+func NewReaderConn(c net.Conn, bytesPerSec float64) net.Conn {
+	s := &conn{
+		Conn: c,
+		r:    c,
+		w:    c,
+		ctx:  context.Background(),
+	}
+	s.readLimiter = rate.NewLimiter(rate.Limit(bytesPerSec), burstLimit)
+	s.readLimiter.AllowN(time.Now(), burstLimit) // spend initial burst
+	return s
+}
+
+//NewtRateLimitWriterConn sets rate limit (bytes/sec) to the Conn write.
+func NewWriterConn(c net.Conn, bytesPerSec float64) net.Conn {
+	s := &conn{
+		Conn: c,
+		r:    c,
+		w:    c,
+		ctx:  context.Background(),
+	}
+	s.writeLimiter = rate.NewLimiter(rate.Limit(bytesPerSec), burstLimit)
+	s.writeLimiter.AllowN(time.Now(), burstLimit) // spend initial burst
+	return s
+}
+
+// Read reads bytes into p.
+func (s *conn) Read(p []byte) (int, error) {
+	if s.readLimiter == nil {
+		return s.r.Read(p)
+	}
+	n, err := s.r.Read(p)
+	if err != nil {
+		return n, err
+	}
+	if err := s.readLimiter.WaitN(s.ctx, n); err != nil {
+		return n, err
+	}
+	return n, nil
+}
+
+// Write writes bytes from p.
+func (s *conn) Write(p []byte) (int, error) {
+	if s.writeLimiter == nil {
+		return s.w.Write(p)
+	}
+	n, err := s.w.Write(p)
+	if err != nil {
+		return n, err
+	}
+	if err := s.writeLimiter.WaitN(s.ctx, n); err != nil {
+		return n, err
+	}
+	return n, err
+}
+
 // NewReader returns a reader that implements io.Reader with rate limiting.
 func NewReader(r io.Reader) *Reader {
 	return &Reader{
--- a/utils/jumper/jumper.go
+++ b/utils/jumper/jumper.go
@ -0,0 +1,103 @@
+package jumper
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"net"
+	"net/url"
+	"time"
+
+	"golang.org/x/net/proxy"
+)
+
+type Jumper struct {
+	proxyURL *url.URL
+	timeout  time.Duration
+}
+type socks5Dialer struct {
+	timeout time.Duration
+}
+
+func (s socks5Dialer) Dial(network, addr string) (net.Conn, error) {
+	return net.DialTimeout(network, addr, s.timeout)
+}
+
+func New(proxyURL string, timeout time.Duration) (j Jumper, err error) {
+	u, err := url.Parse(proxyURL)
+	if err != nil {
+		return
+	}
+	j = Jumper{
+		proxyURL: u,
+		timeout:  timeout,
+	}
+	return
+}
+func (j *Jumper) Dial(address string, timeout time.Duration) (conn net.Conn, err error) {
+	switch j.proxyURL.Scheme {
+	case "https":
+		return j.dialHTTPS(address, timeout)
+	case "socks5":
+		return j.dialSOCKS5(address, timeout)
+	default:
+		return nil, fmt.Errorf("unkown scheme of %s", j.proxyURL.String())
+	}
+}
+func (j *Jumper) dialHTTPS(address string, timeout time.Duration) (conn net.Conn, err error) {
+	conn, err = net.DialTimeout("tcp", j.proxyURL.Host, timeout)
+	if err != nil {
+		return
+	}
+	pb := new(bytes.Buffer)
+	pb.Write([]byte(fmt.Sprintf("CONNECT %s HTTP/1.1\r\n", address)))
+	pb.WriteString(fmt.Sprintf("Host: %s\r\n", address))
+	pb.WriteString(fmt.Sprintf("Proxy-Host: %s\r\n", address))
+	pb.WriteString("Proxy-Connection: Keep-Alive\r\n")
+	pb.WriteString("Connection: Keep-Alive\r\n")
+	if j.proxyURL.User != nil {
+		p, _ := j.proxyURL.User.Password()
+		u := fmt.Sprintf("%s:%s", j.proxyURL.User.Username(), p)
+		pb.Write([]byte(fmt.Sprintf("Proxy-Authorization: Basic %s\r\n", base64.StdEncoding.EncodeToString([]byte(u)))))
+	}
+	pb.Write([]byte("\r\n"))
+	_, err = conn.Write(pb.Bytes())
+	if err != nil {
+		conn.Close()
+		conn = nil
+		err = fmt.Errorf("error connecting to proxy: %s", err)
+		return
+	}
+	reply := make([]byte, 1024)
+	conn.SetDeadline(time.Now().Add(timeout))
+	n, err := conn.Read(reply)
+	conn.SetDeadline(time.Time{})
+	if err != nil {
+		err = fmt.Errorf("error read reply from proxy: %s", err)
+		conn.Close()
+		conn = nil
+		return
+	}
+	if bytes.Index(reply[:n], []byte("200")) == -1 {
+		err = fmt.Errorf("error greeting to proxy, response: %s", string(reply[:n]))
+		conn.Close()
+		conn = nil
+		return
+	}
+	return
+}
+func (j *Jumper) dialSOCKS5(address string, timeout time.Duration) (conn net.Conn, err error) {
+	auth := &proxy.Auth{}
+	if j.proxyURL.User != nil {
+		auth.User = j.proxyURL.User.Username()
+		auth.Password, _ = j.proxyURL.User.Password()
+	} else {
+		auth = nil
+	}
+	dialSocksProxy, err := proxy.SOCKS5("tcp", j.proxyURL.Host, auth, socks5Dialer{timeout: timeout})
+	if err != nil {
+		err = fmt.Errorf("error connecting to proxy: %s", err)
+		return
+	}
+	return dialSocksProxy.Dial("tcp", address)
+}
--- a/utils/lb/backend.go
+++ b/utils/lb/backend.go
@ -0,0 +1,215 @@
+package lb
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"net"
+	"runtime/debug"
+	"sync"
+	"time"
+
+	"github.com/snail007/goproxy/utils/dnsx"
+)
+
+// BackendConfig it's the configuration loaded
+type BackendConfig struct {
+	Address string
+
+	ActiveAfter   int
+	InactiveAfter int
+	Weight        int
+
+	Timeout   time.Duration
+	RetryTime time.Duration
+
+	IsMuxCheck  bool
+	ConnFactory func(address string, timeout time.Duration) (net.Conn, error)
+}
+type BackendsConfig []*BackendConfig
+
+// BackendControl keep the control data
+type BackendControl struct {
+	Failed bool // The last request failed
+	Active bool
+
+	InactiveTries int
+	ActiveTries   int
+
+	Connections int
+
+	ConnectUsedMillisecond int
+
+	isStop bool
+}
+
+// Backend structure
+type Backend struct {
+	BackendConfig
+	BackendControl
+	sync.RWMutex
+	log *log.Logger
+	dr  *dnsx.DomainResolver
+}
+
+type Backends []*Backend
+
+func NewBackend(backendConfig BackendConfig, dr *dnsx.DomainResolver, log *log.Logger) (*Backend, error) {
+
+	if backendConfig.Address == "" {
+		return nil, errors.New("Address rquired")
+	}
+	if backendConfig.ActiveAfter == 0 {
+		backendConfig.ActiveAfter = 2
+	}
+	if backendConfig.InactiveAfter == 0 {
+		backendConfig.InactiveAfter = 3
+	}
+	if backendConfig.Weight == 0 {
+		backendConfig.Weight = 1
+	}
+	if backendConfig.Timeout == 0 {
+		backendConfig.Timeout = time.Millisecond * 1500
+	}
+	if backendConfig.RetryTime == 0 {
+		backendConfig.RetryTime = time.Millisecond * 2000
+	}
+	return &Backend{
+		dr:            dr,
+		log:           log,
+		BackendConfig: backendConfig,
+		BackendControl: BackendControl{
+			Failed:                 true,
+			Active:                 false,
+			InactiveTries:          0,
+			ActiveTries:            0,
+			Connections:            0,
+			ConnectUsedMillisecond: 0,
+			isStop:                 false,
+		},
+	}, nil
+}
+func (b *Backend) StopHeartCheck() {
+	b.isStop = true
+}
+
+func (b *Backend) IncreasConns() {
+	b.RWMutex.Lock()
+	b.Connections++
+	b.RWMutex.Unlock()
+}
+
+func (b *Backend) DecreaseConns() {
+	b.RWMutex.Lock()
+	b.Connections--
+	b.RWMutex.Unlock()
+}
+
+func (b *Backend) StartHeartCheck() {
+	if b.IsMuxCheck {
+		b.startMuxHeartCheck()
+	} else {
+		b.startTCPHeartCheck()
+	}
+}
+func (b *Backend) startMuxHeartCheck() {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		for {
+			if b.isStop {
+				return
+			}
+			var c net.Conn
+			var err error
+			start := time.Now().UnixNano() / int64(time.Microsecond)
+			c, err = b.getConn()
+			b.ConnectUsedMillisecond = int(time.Now().UnixNano()/int64(time.Microsecond) - start)
+			if err != nil {
+				b.Active = false
+				time.Sleep(time.Second * 2)
+				continue
+			} else {
+				b.Active = true
+			}
+			for {
+				buf := make([]byte, 1)
+				c.Read(buf)
+				buf = nil
+				break
+			}
+			b.Active = false
+		}
+	}()
+}
+
+// Monitoring the backend
+func (b *Backend) startTCPHeartCheck() {
+	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:",e, string(debug.Stack()))
+			}
+		}()
+		for {
+			if b.isStop {
+				return
+			}
+			var c net.Conn
+			var err error
+			start := time.Now().UnixNano() / int64(time.Microsecond)
+			c, err = b.getConn()
+			b.ConnectUsedMillisecond = int(time.Now().UnixNano()/int64(time.Microsecond) - start)
+			if err == nil {
+				c.Close()
+			}
+			if err != nil {
+				b.RWMutex.Lock()
+				// Max tries before consider inactive
+				if b.InactiveTries >= b.InactiveAfter {
+					//b.log.Printf("Backend inactive [%s]", b.Address)
+					b.Active = false
+					b.ActiveTries = 0
+				} else {
+					// Ok that guy it's out of the game
+					b.Failed = true
+					b.InactiveTries++
+					//b.log.Printf("Error to check address [%s] tries [%d]", b.Address, b.InactiveTries)
+				}
+				b.RWMutex.Unlock()
+			} else {
+
+				// Ok, let's keep working boys
+				b.RWMutex.Lock()
+				if b.ActiveTries >= b.ActiveAfter {
+					if b.Failed {
+						//log.Printf("Backend active [%s]", b.Address)
+					}
+					b.Failed = false
+					b.Active = true
+					b.InactiveTries = 0
+				} else {
+					b.ActiveTries++
+				}
+				b.RWMutex.Unlock()
+			}
+			time.Sleep(b.RetryTime)
+		}
+	}()
+}
+func (b *Backend) getConn() (conn net.Conn, err error) {
+	address := b.Address
+	if b.dr != nil && b.dr.DnsAddress() != "" {
+		address, err = b.dr.Resolve(b.Address)
+		if err != nil {
+			b.log.Printf("dns error %s , ERR:%s", b.Address, err)
+		}
+	}
+	if b.ConnFactory != nil {
+		return b.ConnFactory(address, b.Timeout)
+	}
+	return net.DialTimeout("tcp", address, b.Timeout)
+}
--- a/utils/lb/lb.go
+++ b/utils/lb/lb.go
@ -0,0 +1,693 @@
+package lb
+
+import (
+	"crypto/md5"
+	"log"
+	"net"
+	"sync"
+
+	"github.com/snail007/goproxy/utils/dnsx"
+)
+
+const (
+	SELECT_ROUNDROBIN = iota
+	SELECT_LEASTCONN
+	SELECT_HASH
+	SELECT_WEITHT
+	SELECT_LEASTTIME
+)
+
+type Selector interface {
+	Select(srcAddr string) (addr string)
+	SelectBackend(srcAddr string) (b *Backend)
+	IncreasConns(addr string)
+	DecreaseConns(addr string)
+	Stop()
+	Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger)
+	IsActive() bool
+	ActiveCount() (count int)
+	Backends() (bs []*Backend)
+}
+
+type Group struct {
+	selector *Selector
+	log      *log.Logger
+	dr       *dnsx.DomainResolver
+	lock     *sync.Mutex
+	last     *Backend
+	debug    bool
+	bks      []*Backend
+}
+
+func NewGroup(selectType int, configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger, debug bool) Group {
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	var s Selector
+	switch selectType {
+	case SELECT_ROUNDROBIN:
+		s = NewRoundRobin(bks, log, debug)
+	case SELECT_LEASTCONN:
+		s = NewLeastConn(bks, log, debug)
+	case SELECT_HASH:
+		s = NewHash(bks, log, debug)
+	case SELECT_WEITHT:
+		s = NewWeight(bks, log, debug)
+	case SELECT_LEASTTIME:
+		s = NewLeastTime(bks, log, debug)
+	}
+	return Group{
+		selector: &s,
+		log:      log,
+		dr:       dr,
+		lock:     &sync.Mutex{},
+		debug:    debug,
+		bks:      bks,
+	}
+}
+func (g *Group) Select(srcAddr string, onlyHa bool) (addr string) {
+	if len(g.bks) == 1 {
+		return g.bks[0].Address
+	}
+	if onlyHa {
+		g.lock.Lock()
+		defer g.lock.Unlock()
+		if g.last != nil && (g.last.Active || g.last.ConnectUsedMillisecond == 0) {
+			if g.debug {
+				g.log.Printf("############ choosed %s from lastest ############", g.last.Address)
+				printDebug(true, g.log, nil, srcAddr, (*g.selector).Backends())
+			}
+			return g.last.Address
+		}
+		g.last = (*g.selector).SelectBackend(srcAddr)
+		if !g.last.Active && g.last.ConnectUsedMillisecond > 0 {
+			g.log.Printf("###warn### lb selected empty , return default , for : %s", srcAddr)
+		}
+		return g.last.Address
+	}
+	b := (*g.selector).SelectBackend(srcAddr)
+	return b.Address
+
+}
+func (g *Group) IncreasConns(addr string) {
+	(*g.selector).IncreasConns(addr)
+}
+func (g *Group) DecreaseConns(addr string) {
+	(*g.selector).DecreaseConns(addr)
+}
+func (g *Group) Stop() {
+	if g.selector != nil {
+		(*g.selector).Stop()
+	}
+}
+func (g *Group) IsActive() bool {
+	return (*g.selector).IsActive()
+}
+func (g *Group) ActiveCount() (count int) {
+	return (*g.selector).ActiveCount()
+}
+func (g *Group) Reset(addrs []string) {
+	bks := (*g.selector).Backends()
+	if len(bks) == 0 {
+		return
+	}
+	cfg := bks[0].BackendConfig
+	configs := BackendsConfig{}
+	for _, addr := range addrs {
+		c := cfg
+		c.Address = addr
+		configs = append(configs, &c)
+	}
+	(*g.selector).Reset(configs, g.dr, g.log)
+	g.bks = (*g.selector).Backends()
+}
+func (g *Group) Backends() []*Backend {
+	return (*g.selector).Backends()
+}
+
+//########################RoundRobin##########################
+type RoundRobin struct {
+	sync.Mutex
+	backendIndex int
+	backends     Backends
+	log          *log.Logger
+	debug        bool
+}
+
+func NewRoundRobin(backends Backends, log *log.Logger, debug bool) Selector {
+	return &RoundRobin{
+		backends: backends,
+		log:      log,
+		debug:    debug,
+	}
+
+}
+func (r *RoundRobin) Select(srcAddr string) (addr string) {
+	return r.SelectBackend(srcAddr).Address
+}
+func (r *RoundRobin) SelectBackend(srcAddr string) (b *Backend) {
+	r.Lock()
+	defer r.Unlock()
+	defer func() {
+		printDebug(r.debug, r.log, b, srcAddr, r.backends)
+	}()
+	if len(r.backends) == 0 {
+		return
+	}
+	if len(r.backends) == 1 {
+		return r.backends[0]
+	}
+RETRY:
+	found := false
+	for _, b := range r.backends {
+		if b.Active {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return r.backends[0]
+	}
+	r.backendIndex++
+	if r.backendIndex > len(r.backends)-1 {
+		r.backendIndex = 0
+	}
+	if !r.backends[r.backendIndex].Active {
+		goto RETRY
+	}
+	return r.backends[r.backendIndex]
+}
+func (r *RoundRobin) IncreasConns(addr string) {
+
+}
+func (r *RoundRobin) DecreaseConns(addr string) {
+
+}
+func (r *RoundRobin) Stop() {
+	for _, b := range r.backends {
+		b.StopHeartCheck()
+	}
+}
+func (r *RoundRobin) Backends() []*Backend {
+	return r.backends
+}
+func (r *RoundRobin) IsActive() bool {
+	for _, b := range r.backends {
+		if b.Active {
+			return true
+		}
+	}
+	return false
+}
+func (r *RoundRobin) ActiveCount() (count int) {
+	for _, b := range r.backends {
+		if b.Active {
+			count++
+		}
+	}
+	return
+}
+func (r *RoundRobin) Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger) {
+	r.Lock()
+	defer r.Unlock()
+	r.Stop()
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	r.backends = bks
+}
+
+//########################LeastConn##########################
+
+type LeastConn struct {
+	sync.Mutex
+	backends Backends
+	log      *log.Logger
+	debug    bool
+}
+
+func NewLeastConn(backends []*Backend, log *log.Logger, debug bool) Selector {
+	lc := LeastConn{
+		backends: backends,
+		log:      log,
+		debug:    debug,
+	}
+	return &lc
+}
+
+func (lc *LeastConn) Select(srcAddr string) (addr string) {
+	return lc.SelectBackend(srcAddr).Address
+}
+func (lc *LeastConn) SelectBackend(srcAddr string) (b *Backend) {
+	lc.Lock()
+	defer lc.Unlock()
+	defer func() {
+		printDebug(lc.debug, lc.log, b, srcAddr, lc.backends)
+	}()
+	if len(lc.backends) == 0 {
+		return
+	}
+	if len(lc.backends) == 1 {
+		return lc.backends[0]
+	}
+	found := false
+	for _, b := range lc.backends {
+		if b.Active {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return lc.backends[0]
+	}
+	min := lc.backends[0].Connections
+	index := 0
+	for i, b := range lc.backends {
+		if b.Active {
+			min = b.Connections
+			index = i
+			break
+		}
+	}
+	for i, b := range lc.backends {
+		if b.Active && b.Connections <= min {
+			min = b.Connections
+			index = i
+		}
+	}
+	return lc.backends[index]
+}
+func (lc *LeastConn) IncreasConns(addr string) {
+	for _, a := range lc.backends {
+		if a.Address == addr {
+			a.IncreasConns()
+			return
+		}
+	}
+}
+func (lc *LeastConn) DecreaseConns(addr string) {
+	for _, a := range lc.backends {
+		if a.Address == addr {
+			a.DecreaseConns()
+			return
+		}
+	}
+}
+func (lc *LeastConn) Stop() {
+	for _, b := range lc.backends {
+		b.StopHeartCheck()
+	}
+}
+func (lc *LeastConn) IsActive() bool {
+	for _, b := range lc.backends {
+		if b.Active {
+			return true
+		}
+	}
+	return false
+}
+func (lc *LeastConn) ActiveCount() (count int) {
+	for _, b := range lc.backends {
+		if b.Active {
+			count++
+		}
+	}
+	return
+}
+func (lc *LeastConn) Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger) {
+	lc.Lock()
+	defer lc.Unlock()
+	lc.Stop()
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	lc.backends = bks
+}
+func (lc *LeastConn) Backends() []*Backend {
+	return lc.backends
+}
+
+//########################Hash##########################
+type Hash struct {
+	sync.Mutex
+	backends Backends
+	log      *log.Logger
+	debug    bool
+}
+
+func NewHash(backends Backends, log *log.Logger, debug bool) Selector {
+	return &Hash{
+		backends: backends,
+		log:      log,
+		debug:    debug,
+	}
+}
+func (h *Hash) Select(srcAddr string) (addr string) {
+	return h.SelectBackend(srcAddr).Address
+}
+func (h *Hash) SelectBackend(srcAddr string) (b *Backend) {
+	h.Lock()
+	defer h.Unlock()
+	defer func() {
+		printDebug(h.debug, h.log, b, srcAddr, h.backends)
+	}()
+	if len(h.backends) == 0 {
+		return
+	}
+	if len(h.backends) == 1 {
+		return h.backends[0]
+	}
+	i := 0
+	host, _, err := net.SplitHostPort(srcAddr)
+	if err != nil {
+		return
+	}
+	//porti, _ := strconv.Atoi(port)
+	//i += porti
+	for _, b := range md5.Sum([]byte(host)) {
+		i += int(b)
+	}
+RETRY:
+	found := false
+	for _, b := range h.backends {
+		if b.Active {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return h.backends[0]
+	}
+	k := i % len(h.backends)
+	if !h.backends[k].Active {
+		i++
+		goto RETRY
+	}
+	return h.backends[k]
+}
+func (h *Hash) IncreasConns(addr string) {
+
+}
+func (h *Hash) DecreaseConns(addr string) {
+
+}
+func (h *Hash) Stop() {
+	for _, b := range h.backends {
+		b.StopHeartCheck()
+	}
+}
+func (h *Hash) IsActive() bool {
+	for _, b := range h.backends {
+		if b.Active {
+			return true
+		}
+	}
+	return false
+}
+func (h *Hash) ActiveCount() (count int) {
+	for _, b := range h.backends {
+		if b.Active {
+			count++
+		}
+	}
+	return
+}
+func (h *Hash) Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger) {
+	h.Lock()
+	defer h.Unlock()
+	h.Stop()
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	h.backends = bks
+}
+func (h *Hash) Backends() []*Backend {
+	return h.backends
+}
+
+//########################Weight##########################
+type Weight struct {
+	sync.Mutex
+	backends Backends
+	log      *log.Logger
+	debug    bool
+}
+
+func NewWeight(backends Backends, log *log.Logger, debug bool) Selector {
+	return &Weight{
+		backends: backends,
+		log:      log,
+		debug:    debug,
+	}
+}
+func (w *Weight) Select(srcAddr string) (addr string) {
+	return w.SelectBackend(srcAddr).Address
+}
+func (w *Weight) SelectBackend(srcAddr string) (b *Backend) {
+	w.Lock()
+	defer w.Unlock()
+	defer func() {
+		printDebug(w.debug, w.log, b, srcAddr, w.backends)
+	}()
+	if len(w.backends) == 0 {
+		return
+	}
+	if len(w.backends) == 1 {
+		return w.backends[0]
+	}
+
+	found := false
+	for _, b := range w.backends {
+		if b.Active {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return w.backends[0]
+	}
+
+	min := w.backends[0].Connections / w.backends[0].Weight
+	index := 0
+	for i, b := range w.backends {
+		if b.Active {
+			min = b.Connections / b.Weight
+			index = i
+			break
+		}
+	}
+	for i, b := range w.backends {
+		if b.Active && b.Connections/b.Weight <= min {
+			min = b.Connections
+			index = i
+		}
+	}
+	return w.backends[index]
+}
+func (w *Weight) IncreasConns(addr string) {
+	w.Lock()
+	defer w.Unlock()
+	for _, a := range w.backends {
+		if a.Address == addr {
+			a.IncreasConns()
+			return
+		}
+	}
+}
+func (w *Weight) DecreaseConns(addr string) {
+	w.Lock()
+	defer w.Unlock()
+	for _, a := range w.backends {
+		if a.Address == addr {
+			a.DecreaseConns()
+			return
+		}
+	}
+}
+func (w *Weight) Stop() {
+	for _, b := range w.backends {
+		b.StopHeartCheck()
+	}
+}
+func (w *Weight) IsActive() bool {
+	for _, b := range w.backends {
+		if b.Active {
+			return true
+		}
+	}
+	return false
+}
+func (w *Weight) ActiveCount() (count int) {
+	for _, b := range w.backends {
+		if b.Active {
+			count++
+		}
+	}
+	return
+}
+func (w *Weight) Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger) {
+	w.Lock()
+	defer w.Unlock()
+	w.Stop()
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	w.backends = bks
+}
+func (w *Weight) Backends() []*Backend {
+	return w.backends
+}
+
+//########################LeastTime##########################
+
+type LeastTime struct {
+	sync.Mutex
+	backends Backends
+	log      *log.Logger
+	debug    bool
+}
+
+func NewLeastTime(backends []*Backend, log *log.Logger, debug bool) Selector {
+	lt := LeastTime{
+		backends: backends,
+		log:      log,
+		debug:    debug,
+	}
+	return &lt
+}
+
+func (lt *LeastTime) Select(srcAddr string) (addr string) {
+	return lt.SelectBackend(srcAddr).Address
+}
+func (lt *LeastTime) SelectBackend(srcAddr string) (b *Backend) {
+	lt.Lock()
+	defer lt.Unlock()
+	defer func() {
+		printDebug(lt.debug, lt.log, b, srcAddr, lt.backends)
+	}()
+	if len(lt.backends) == 0 {
+		return
+	}
+	if len(lt.backends) == 1 {
+		return lt.backends[0]
+	}
+	found := false
+	for _, b := range lt.backends {
+		if b.Active {
+			found = true
+			break
+		}
+	}
+	if !found {
+		return lt.backends[0]
+	}
+	min := lt.backends[0].ConnectUsedMillisecond
+	index := 0
+	for i, b := range lt.backends {
+		if b.Active {
+			min = b.ConnectUsedMillisecond
+			index = i
+			break
+		}
+	}
+	for i, b := range lt.backends {
+		if b.Active && b.ConnectUsedMillisecond > 0 && b.ConnectUsedMillisecond <= min {
+			min = b.ConnectUsedMillisecond
+			index = i
+		}
+	}
+	return lt.backends[index]
+}
+func (lt *LeastTime) IncreasConns(addr string) {
+
+}
+func (lt *LeastTime) DecreaseConns(addr string) {
+
+}
+func (lt *LeastTime) Stop() {
+	for _, b := range lt.backends {
+		b.StopHeartCheck()
+	}
+}
+func (lt *LeastTime) IsActive() bool {
+	for _, b := range lt.backends {
+		if b.Active {
+			return true
+		}
+	}
+	return false
+}
+func (lt *LeastTime) ActiveCount() (count int) {
+	for _, b := range lt.backends {
+		if b.Active {
+			count++
+		}
+	}
+	return
+}
+func (lt *LeastTime) Reset(configs BackendsConfig, dr *dnsx.DomainResolver, log *log.Logger) {
+	lt.Lock()
+	defer lt.Unlock()
+	lt.Stop()
+	bks := []*Backend{}
+	for _, c := range configs {
+		b, _ := NewBackend(*c, dr, log)
+		bks = append(bks, b)
+	}
+	if len(bks) > 1 {
+		for _, b := range bks {
+			b.StartHeartCheck()
+		}
+	}
+	lt.backends = bks
+}
+func (lt *LeastTime) Backends() []*Backend {
+	return lt.backends
+}
+func printDebug(isDebug bool, log *log.Logger, selected *Backend, srcAddr string, backends []*Backend) {
+	if isDebug {
+		log.Printf("############ LB start ############\n")
+		if selected != nil {
+			log.Printf("choosed %s for %s\n", selected.Address, srcAddr)
+		}
+		for _, v := range backends {
+			log.Printf("addr:%s,conns:%d,time:%d,weight:%d,active:%v\n", v.Address, v.Connections, v.ConnectUsedMillisecond, v.Weight, v.Active)
+		}
+		log.Printf("############ LB end ############\n")
+	}
+}
--- a/utils/mapx/map.go
+++ b/utils/mapx/map.go
@ -1,7 +1,9 @@
-package utils
+package mapx

 import (
 	"encoding/json"
+	"fmt"
+	"runtime/debug"
 	"sync"
 )

@ -194,10 +196,20 @@ func snapshot(m ConcurrentMap) (chans []chan Tuple) {

 // fanIn reads elements from channels `chans` into channel `out`
 func fanIn(chans []chan Tuple, out chan Tuple) {
+	defer func() {
+		if e := recover(); e != nil {
+			fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+		}
+	}()
 	wg := sync.WaitGroup{}
 	wg.Add(len(chans))
 	for _, ch := range chans {
 		go func(ch chan Tuple) {
+			defer func() {
+				if e := recover(); e != nil {
+					fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+				}
+			}()
 			for t := range ch {
 				out <- t
 			}
@ -244,11 +256,21 @@ func (m ConcurrentMap) Keys() []string {
 	count := m.Count()
 	ch := make(chan string, count)
 	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
 		// Foreach shard.
 		wg := sync.WaitGroup{}
 		wg.Add(SHARD_COUNT)
 		for _, shard := range m {
 			go func(shard *ConcurrentMapShared) {
+				defer func() {
+					if e := recover(); e != nil {
+						fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+					}
+				}()
 				// Foreach key, value pair.
 				shard.RLock()
 				for key := range shard.items {
--- a/utils/serve-channel.go
+++ b/utils/serve-channel.go
@ -1,229 +0,0 @@
-package utils
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"errors"
-	"fmt"
-	logger "log"
-	"net"
-	"runtime/debug"
-	"strconv"
-
-	"github.com/snail007/goproxy/services/kcpcfg"
-
-	kcp "github.com/xtaci/kcp-go"
-)
-
-type ServerChannel struct {
-	ip               string
-	port             int
-	Listener         *net.Listener
-	UDPListener      *net.UDPConn
-	errAcceptHandler func(err error)
-	log              *logger.Logger
-}
-
-func NewServerChannel(ip string, port int, log *logger.Logger) ServerChannel {
-	return ServerChannel{
-		ip:   ip,
-		port: port,
-		log:  log,
-		errAcceptHandler: func(err error) {
-			log.Printf("accept error , ERR:%s", err)
-		},
-	}
-}
-func NewServerChannelHost(host string, log *logger.Logger) ServerChannel {
-	h, port, _ := net.SplitHostPort(host)
-	p, _ := strconv.Atoi(port)
-	return ServerChannel{
-		ip:   h,
-		port: p,
-		log:  log,
-		errAcceptHandler: func(err error) {
-			log.Printf("accept error , ERR:%s", err)
-		},
-	}
-}
-func (sc *ServerChannel) SetErrAcceptHandler(fn func(err error)) {
-	sc.errAcceptHandler = fn
-}
-func (sc *ServerChannel) ListenTls(certBytes, keyBytes, caCertBytes []byte, fn func(conn net.Conn)) (err error) {
-	sc.Listener, err = sc.listenTls(sc.ip, sc.port, certBytes, keyBytes, caCertBytes)
-	if err == nil {
-		go func() {
-			defer func() {
-				if e := recover(); e != nil {
-					sc.log.Printf("ListenTls crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-				}
-			}()
-			for {
-				var conn net.Conn
-				conn, err = (*sc.Listener).Accept()
-				if err == nil {
-					go func() {
-						defer func() {
-							if e := recover(); e != nil {
-								sc.log.Printf("tls connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-							}
-						}()
-						fn(conn)
-					}()
-				} else {
-					sc.errAcceptHandler(err)
-					(*sc.Listener).Close()
-					break
-				}
-			}
-		}()
-	}
-	return
-}
-func (sc *ServerChannel) listenTls(ip string, port int, certBytes, keyBytes, caCertBytes []byte) (ln *net.Listener, err error) {
-
-	var cert tls.Certificate
-	cert, err = tls.X509KeyPair(certBytes, keyBytes)
-	if err != nil {
-		return
-	}
-	clientCertPool := x509.NewCertPool()
-	caBytes := certBytes
-	if caCertBytes != nil {
-		caBytes = caCertBytes
-	}
-	ok := clientCertPool.AppendCertsFromPEM(caBytes)
-	if !ok {
-		err = errors.New("failed to parse root certificate")
-	}
-	config := &tls.Config{
-		ClientCAs:    clientCertPool,
-		Certificates: []tls.Certificate{cert},
-		ClientAuth:   tls.RequireAndVerifyClientCert,
-	}
-	_ln, err := tls.Listen("tcp", fmt.Sprintf("%s:%d", ip, port), config)
-	if err == nil {
-		ln = &_ln
-	}
-	return
-}
-func (sc *ServerChannel) ListenTCP(fn func(conn net.Conn)) (err error) {
-	var l net.Listener
-	l, err = net.Listen("tcp", fmt.Sprintf("%s:%d", sc.ip, sc.port))
-	if err == nil {
-		sc.Listener = &l
-		go func() {
-			defer func() {
-				if e := recover(); e != nil {
-					sc.log.Printf("ListenTCP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-				}
-			}()
-			for {
-				var conn net.Conn
-				conn, err = (*sc.Listener).Accept()
-				if err == nil {
-					go func() {
-						defer func() {
-							if e := recover(); e != nil {
-								sc.log.Printf("tcp connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-							}
-						}()
-						fn(conn)
-					}()
-				} else {
-					sc.errAcceptHandler(err)
-					break
-				}
-			}
-		}()
-	}
-	return
-}
-func (sc *ServerChannel) ListenUDP(fn func(packet []byte, localAddr, srcAddr *net.UDPAddr)) (err error) {
-	addr := &net.UDPAddr{IP: net.ParseIP(sc.ip), Port: sc.port}
-	l, err := net.ListenUDP("udp", addr)
-	if err == nil {
-		sc.UDPListener = l
-		go func() {
-			defer func() {
-				if e := recover(); e != nil {
-					sc.log.Printf("ListenUDP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-				}
-			}()
-			for {
-				var buf = make([]byte, 2048)
-				n, srcAddr, err := (*sc.UDPListener).ReadFromUDP(buf)
-				if err == nil {
-					packet := buf[0:n]
-					go func() {
-						defer func() {
-							if e := recover(); e != nil {
-								sc.log.Printf("udp data handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-							}
-						}()
-						fn(packet, addr, srcAddr)
-					}()
-				} else {
-					sc.errAcceptHandler(err)
-					break
-				}
-			}
-		}()
-	}
-	return
-}
-func (sc *ServerChannel) ListenKCP(config kcpcfg.KCPConfigArgs, fn func(conn net.Conn), log *logger.Logger) (err error) {
-	lis, err := kcp.ListenWithOptions(fmt.Sprintf("%s:%d", sc.ip, sc.port), config.Block, *config.DataShard, *config.ParityShard)
-	if err == nil {
-		if err = lis.SetDSCP(*config.DSCP); err != nil {
-			log.Println("SetDSCP:", err)
-			return
-		}
-		if err = lis.SetReadBuffer(*config.SockBuf); err != nil {
-			log.Println("SetReadBuffer:", err)
-			return
-		}
-		if err = lis.SetWriteBuffer(*config.SockBuf); err != nil {
-			log.Println("SetWriteBuffer:", err)
-			return
-		}
-		sc.Listener = new(net.Listener)
-		*sc.Listener = lis
-		go func() {
-			defer func() {
-				if e := recover(); e != nil {
-					sc.log.Printf("ListenKCP crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-				}
-			}()
-			for {
-				//var conn net.Conn
-				conn, err := lis.AcceptKCP()
-				if err == nil {
-					go func() {
-						defer func() {
-							if e := recover(); e != nil {
-								sc.log.Printf("kcp connection handler crashed , err : %s , \ntrace:%s", e, string(debug.Stack()))
-							}
-						}()
-						conn.SetStreamMode(true)
-						conn.SetWriteDelay(true)
-						conn.SetNoDelay(*config.NoDelay, *config.Interval, *config.Resend, *config.NoCongestion)
-						conn.SetMtu(*config.MTU)
-						conn.SetWindowSize(*config.SndWnd, *config.RcvWnd)
-						conn.SetACKNoDelay(*config.AckNodelay)
-						if *config.NoComp {
-							fn(conn)
-						} else {
-							cconn := NewCompStream(conn)
-							fn(cconn)
-						}
-					}()
-				} else {
-					sc.errAcceptHandler(err)
-					break
-				}
-			}
-		}()
-	}
-	return
-}
--- a/utils/socks/client.go
+++ b/utils/socks/client.go
@ -54,7 +54,7 @@ func NewClientConn(conn *net.Conn, network, target string, timeout time.Duration
 		s.header = header
 	}
 	if network == "udp" && target == "" {
-		target = "0.0.0.0:1"
+		target = "0.0.0.0:0"
 	}
 	s.addr = target
 	return s
@ -72,7 +72,7 @@ func (s *ClientConn) Handshake() error {
 	if err != nil {
 		return errors.New("proxy: failed to parse port number: " + portStr)
 	}
-	if port < 1 || port > 0xffff {
+	if s.network == "tcp" && (port < 1 || port > 0xffff) {
 		return errors.New("proxy: port number out of range: " + portStr)
 	}

--- a/utils/socks/server.go
+++ b/utils/socks/server.go
@ -98,6 +98,12 @@ func (s *ServerConn) Method() uint8 {
 func (s *ServerConn) Target() string {
 	return s.target
 }
+func (s *ServerConn) Host() string {
+	return s.dstHost
+}
+func (s *ServerConn) Port() string {
+	return s.dstPort
+}
 func (s *ServerConn) Handshake() (err error) {
 	remoteAddr := (*s.conn).RemoteAddr()
 	//协商开始
--- a/utils/socks/structs.go
+++ b/utils/socks/structs.go
@ -281,6 +281,9 @@ func (p *PacketUDP) Build(destAddr string, data []byte) (err error) {
 	return
 }
 func (p *PacketUDP) Parse(b []byte) (err error) {
+	if len(b) < 9 {
+		return fmt.Errorf("too short packet")
+	}
 	p.frag = uint8(b[2])
 	if p.frag != 0 {
 		err = fmt.Errorf("FRAG only support for 0 , %v ,%v", p.frag, b[:4])
@ -290,13 +293,22 @@ func (p *PacketUDP) Parse(b []byte) (err error) {
 	p.atype = b[3]
 	switch p.atype {
 	case ATYP_IPV4: //IP V4
+		if len(b) < 11 {
+			return fmt.Errorf("too short packet")
+		}
 		p.dstHost = net.IPv4(b[4], b[5], b[6], b[7]).String()
 		portIndex = 8
 	case ATYP_DOMAIN: //域名
 		domainLen := uint8(b[4])
+		if len(b) < int(domainLen)+7 {
+			return fmt.Errorf("too short packet")
+		}
 		p.dstHost = string(b[5 : 5+domainLen]) //b[4]表示域名的长度
 		portIndex = int(5 + domainLen)
 	case ATYP_IPV6: //IP V6
+		if len(b) < 22 {
+			return fmt.Errorf("too short packet")
+		}
 		p.dstHost = net.IP{b[4], b[5], b[6], b[7], b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15], b[16], b[17], b[18], b[19]}.String()
 		portIndex = 20
 	}
@ -333,7 +345,9 @@ func (p *PacketUDP) Bytes() []byte {
 func (p *PacketUDP) Host() string {
 	return p.dstHost
 }
-
+func (p *PacketUDP) Addr() string {
+	return net.JoinHostPort(p.dstHost, p.dstPort)
+}
 func (p *PacketUDP) Port() string {
 	return p.dstPort
 }
--- a/utils/ss/conn.go
+++ b/utils/ss/conn.go
@ -0,0 +1,180 @@
+package ss
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+)
+
+const (
+	OneTimeAuthMask byte = 0x10
+	AddrMask        byte = 0xf
+)
+
+type Conn struct {
+	net.Conn
+	*Cipher
+	readBuf  []byte
+	writeBuf []byte
+	chunkId  uint32
+}
+
+func NewConn(c net.Conn, cipher *Cipher) *Conn {
+	return &Conn{
+		Conn:     c,
+		Cipher:   cipher,
+		readBuf:  leakyBuf.Get(),
+		writeBuf: leakyBuf.Get()}
+}
+
+func (c *Conn) Close() error {
+	leakyBuf.Put(c.readBuf)
+	leakyBuf.Put(c.writeBuf)
+	return c.Conn.Close()
+}
+
+func RawAddr(addr string) (buf []byte, err error) {
+	host, portStr, err := net.SplitHostPort(addr)
+	if err != nil {
+		return nil, fmt.Errorf("ss: address error %s %v", addr, err)
+	}
+	port, err := strconv.Atoi(portStr)
+	if err != nil {
+		return nil, fmt.Errorf("ss: invalid port %s", addr)
+	}
+
+	hostLen := len(host)
+	l := 1 + 1 + hostLen + 2 // addrType + lenByte + address + port
+	buf = make([]byte, l)
+	buf[0] = 3             // 3 means the address is domain name
+	buf[1] = byte(hostLen) // host address length  followed by host address
+	copy(buf[2:], host)
+	binary.BigEndian.PutUint16(buf[2+hostLen:2+hostLen+2], uint16(port))
+	return
+}
+
+// This is intended for use by users implementing a local socks proxy.
+// rawaddr shoud contain part of the data in socks request, starting from the
+// ATYP field. (Refer to rfc1928 for more information.)
+func DialWithRawAddr(rawConn *net.Conn, rawaddr []byte, server string, cipher *Cipher) (c *Conn, err error) {
+	var conn net.Conn
+	if rawConn == nil {
+		conn, err = net.Dial("tcp", server)
+	}
+	if err != nil {
+		return
+	}
+	if rawConn != nil {
+		c = NewConn(*rawConn, cipher)
+	} else {
+		c = NewConn(conn, cipher)
+	}
+
+	if _, err = c.write(rawaddr); err != nil {
+		c.Close()
+		return nil, err
+	}
+	return
+}
+
+// addr should be in the form of host:port
+func Dial(addr, server string, cipher *Cipher) (c *Conn, err error) {
+	ra, err := RawAddr(addr)
+	if err != nil {
+		return
+	}
+	return DialWithRawAddr(nil, ra, server, cipher)
+}
+
+func (c *Conn) GetIv() (iv []byte) {
+	iv = make([]byte, len(c.iv))
+	copy(iv, c.iv)
+	return
+}
+
+func (c *Conn) GetKey() (key []byte) {
+	key = make([]byte, len(c.key))
+	copy(key, c.key)
+	return
+}
+
+func (c *Conn) IsOta() bool {
+	return c.ota
+}
+
+func (c *Conn) GetAndIncrChunkId() (chunkId uint32) {
+	chunkId = c.chunkId
+	c.chunkId += 1
+	return
+}
+
+func (c *Conn) Read(b []byte) (n int, err error) {
+	if c.dec == nil {
+		iv := make([]byte, c.info.ivLen)
+		if _, err = io.ReadFull(c.Conn, iv); err != nil {
+			return
+		}
+		if err = c.initDecrypt(iv); err != nil {
+			return
+		}
+		if len(c.iv) == 0 {
+			c.iv = iv
+		}
+	}
+
+	cipherData := c.readBuf
+	if len(b) > len(cipherData) {
+		cipherData = make([]byte, len(b))
+	} else {
+		cipherData = cipherData[:len(b)]
+	}
+
+	n, err = c.Conn.Read(cipherData)
+	if n > 0 {
+		c.decrypt(b[0:n], cipherData[0:n])
+	}
+	return
+}
+
+func (c *Conn) Write(b []byte) (n int, err error) {
+	nn := len(b)
+
+	headerLen := len(b) - nn
+
+	n, err = c.write(b)
+	// Make sure <= 0 <= len(b), where b is the slice passed in.
+	if n >= headerLen {
+		n -= headerLen
+	}
+	return
+}
+
+func (c *Conn) write(b []byte) (n int, err error) {
+	var iv []byte
+	if c.enc == nil {
+		iv, err = c.initEncrypt()
+		if err != nil {
+			return
+		}
+	}
+
+	cipherData := c.writeBuf
+	dataSize := len(b) + len(iv)
+	if dataSize > len(cipherData) {
+		cipherData = make([]byte, dataSize)
+	} else {
+		cipherData = cipherData[:dataSize]
+	}
+
+	if iv != nil {
+		// Put initialization vector in buffer, do a single write to send both
+		// iv and data.
+		copy(cipherData, iv)
+	}
+
+	c.encrypt(cipherData[len(iv):], b)
+	n, err = c.Conn.Write(cipherData)
+	return
+}
--- a/utils/ss/encrypt.go
+++ b/utils/ss/encrypt.go
@ -0,0 +1,301 @@
+package ss
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/des"
+	"crypto/md5"
+	"crypto/rand"
+	"crypto/rc4"
+	"encoding/binary"
+	"errors"
+	"io"
+	"strings"
+
+	"github.com/Yawning/chacha20"
+	"golang.org/x/crypto/blowfish"
+	"golang.org/x/crypto/cast5"
+	"golang.org/x/crypto/salsa20/salsa"
+)
+
+var errEmptyPassword = errors.New("empty key")
+
+func md5sum(d []byte) []byte {
+	h := md5.New()
+	h.Write(d)
+	return h.Sum(nil)
+}
+
+func evpBytesToKey(password string, keyLen int) (key []byte) {
+	const md5Len = 16
+
+	cnt := (keyLen-1)/md5Len + 1
+	m := make([]byte, cnt*md5Len)
+	copy(m, md5sum([]byte(password)))
+
+	// Repeatedly call md5 until bytes generated is enough.
+	// Each call to md5 uses data: prev md5 sum + password.
+	d := make([]byte, md5Len+len(password))
+	start := 0
+	for i := 1; i < cnt; i++ {
+		start += md5Len
+		copy(d, m[start-md5Len:start])
+		copy(d[md5Len:], password)
+		copy(m[start:], md5sum(d))
+	}
+	return m[:keyLen]
+}
+
+type DecOrEnc int
+
+const (
+	Decrypt DecOrEnc = iota
+	Encrypt
+)
+
+func newStream(block cipher.Block, err error, key, iv []byte,
+	doe DecOrEnc) (cipher.Stream, error) {
+	if err != nil {
+		return nil, err
+	}
+	if doe == Encrypt {
+		return cipher.NewCFBEncrypter(block, iv), nil
+	} else {
+		return cipher.NewCFBDecrypter(block, iv), nil
+	}
+}
+
+func newAESCFBStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := aes.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newAESCTRStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewCTR(block, iv), nil
+}
+
+func newDESStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := des.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newBlowFishStream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := blowfish.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newCast5Stream(key, iv []byte, doe DecOrEnc) (cipher.Stream, error) {
+	block, err := cast5.NewCipher(key)
+	return newStream(block, err, key, iv, doe)
+}
+
+func newRC4MD5Stream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	h := md5.New()
+	h.Write(key)
+	h.Write(iv)
+	rc4key := h.Sum(nil)
+
+	return rc4.NewCipher(rc4key)
+}
+
+func newChaCha20Stream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	return chacha20.NewCipher(key, iv)
+}
+
+func newChaCha20IETFStream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	return chacha20.NewCipher(key, iv)
+}
+
+type salsaStreamCipher struct {
+	nonce   [8]byte
+	key     [32]byte
+	counter int
+}
+
+func (c *salsaStreamCipher) XORKeyStream(dst, src []byte) {
+	var buf []byte
+	padLen := c.counter % 64
+	dataSize := len(src) + padLen
+	if cap(dst) >= dataSize {
+		buf = dst[:dataSize]
+	} else if leakyBufSize >= dataSize {
+		buf = leakyBuf.Get()
+		defer leakyBuf.Put(buf)
+		buf = buf[:dataSize]
+	} else {
+		buf = make([]byte, dataSize)
+	}
+
+	var subNonce [16]byte
+	copy(subNonce[:], c.nonce[:])
+	binary.LittleEndian.PutUint64(subNonce[len(c.nonce):], uint64(c.counter/64))
+
+	// It's difficult to avoid data copy here. src or dst maybe slice from
+	// Conn.Read/Write, which can't have padding.
+	copy(buf[padLen:], src[:])
+	salsa.XORKeyStream(buf, buf, &subNonce, &c.key)
+	copy(dst, buf[padLen:])
+
+	c.counter += len(src)
+}
+
+func newSalsa20Stream(key, iv []byte, _ DecOrEnc) (cipher.Stream, error) {
+	var c salsaStreamCipher
+	copy(c.nonce[:], iv[:8])
+	copy(c.key[:], key[:32])
+	return &c, nil
+}
+
+type cipherInfo struct {
+	keyLen    int
+	ivLen     int
+	newStream func(key, iv []byte, doe DecOrEnc) (cipher.Stream, error)
+}
+
+var cipherMethod = map[string]*cipherInfo{
+	"aes-128-cfb":   {16, 16, newAESCFBStream},
+	"aes-192-cfb":   {24, 16, newAESCFBStream},
+	"aes-256-cfb":   {32, 16, newAESCFBStream},
+	"aes-128-ctr":   {16, 16, newAESCTRStream},
+	"aes-192-ctr":   {24, 16, newAESCTRStream},
+	"aes-256-ctr":   {32, 16, newAESCTRStream},
+	"des-cfb":       {8, 8, newDESStream},
+	"bf-cfb":        {16, 8, newBlowFishStream},
+	"cast5-cfb":     {16, 8, newCast5Stream},
+	"rc4-md5":       {16, 16, newRC4MD5Stream},
+	"rc4-md5-6":     {16, 6, newRC4MD5Stream},
+	"chacha20":      {32, 8, newChaCha20Stream},
+	"chacha20-ietf": {32, 12, newChaCha20IETFStream},
+	"salsa20":       {32, 8, newSalsa20Stream},
+}
+
+func CheckCipherMethod(method string) error {
+	if method == "" {
+		method = "aes-256-cfb"
+	}
+	_, ok := cipherMethod[method]
+	if !ok {
+		return errors.New("Unsupported encryption method: " + method)
+	}
+	return nil
+}
+
+type Cipher struct {
+	enc  cipher.Stream
+	dec  cipher.Stream
+	key  []byte
+	info *cipherInfo
+	ota  bool // one-time auth
+	iv   []byte
+}
+
+// NewCipher creates a cipher that can be used in Dial() etc.
+// Use cipher.Copy() to create a new cipher with the same method and password
+// to avoid the cost of repeated cipher initialization.
+func NewCipher(method, password string) (c *Cipher, err error) {
+	if password == "" {
+		return nil, errEmptyPassword
+	}
+	var ota bool
+	if strings.HasSuffix(strings.ToLower(method), "-auth") {
+		method = method[:len(method)-5] // len("-auth") = 5
+		ota = true
+	} else {
+		ota = false
+	}
+	mi, ok := cipherMethod[method]
+	if !ok {
+		return nil, errors.New("Unsupported encryption method: " + method)
+	}
+
+	key := evpBytesToKey(password, mi.keyLen)
+
+	c = &Cipher{key: key, info: mi}
+
+	if err != nil {
+		return nil, err
+	}
+	c.ota = ota
+	return c, nil
+}
+
+// Initializes the block cipher with CFB mode, returns IV.
+func (c *Cipher) initEncrypt() (iv []byte, err error) {
+	if c.iv == nil {
+		iv = make([]byte, c.info.ivLen)
+		if _, err := io.ReadFull(rand.Reader, iv); err != nil {
+			return nil, err
+		}
+		c.iv = iv
+	} else {
+		iv = c.iv
+	}
+	c.enc, err = c.info.newStream(c.key, iv, Encrypt)
+	return
+}
+
+func (c *Cipher) initDecrypt(iv []byte) (err error) {
+	c.dec, err = c.info.newStream(c.key, iv, Decrypt)
+	return
+}
+
+func (c *Cipher) encrypt(dst, src []byte) {
+	c.enc.XORKeyStream(dst, src)
+}
+
+func (c *Cipher) decrypt(dst, src []byte) {
+	c.dec.XORKeyStream(dst, src)
+}
+func (c *Cipher) Encrypt(src []byte) (cipherData []byte) {
+	cipher := c.Copy()
+	iv, err := cipher.initEncrypt()
+	if err != nil {
+		return
+	}
+	packetLen := len(src) + len(iv)
+	cipherData = make([]byte, packetLen)
+	copy(cipherData, iv)
+	cipher.encrypt(cipherData[len(iv):], src)
+	return
+}
+
+func (c *Cipher) Decrypt(src []byte) (data []byte) {
+	cipher := c.Copy()
+	if len(src) < c.info.ivLen {
+		return
+	}
+	iv := make([]byte, c.info.ivLen)
+	copy(iv, src[:c.info.ivLen])
+	if err := cipher.initDecrypt(iv); err != nil {
+		return
+	}
+	data = make([]byte, len(src)-len(iv))
+	cipher.decrypt(data[0:], src[c.info.ivLen:])
+	return
+}
+
+// Copy creates a new cipher at it's initial state.
+func (c *Cipher) Copy() *Cipher {
+	// This optimization maybe not necessary. But without this function, we
+	// need to maintain a table cache for newTableCipher and use lock to
+	// protect concurrent access to that cache.
+
+	// AES and DES ciphers does not return specific types, so it's difficult
+	// to create copy. But their initizliation time is less than 4000ns on my
+	// 2.26 GHz Intel Core 2 Duo processor. So no need to worry.
+
+	// Currently, blow-fish and cast5 initialization cost is an order of
+	// maganitude slower than other ciphers. (I'm not sure whether this is
+	// because the current implementation is not highly optimized, or this is
+	// the nature of the algorithm.)
+
+	nc := *c
+	nc.enc = nil
+	nc.dec = nil
+	nc.ota = c.ota
+	return &nc
+}
--- a/utils/ss/util.go
+++ b/utils/ss/util.go
@ -0,0 +1,82 @@
+package ss
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"strconv"
+
+	"github.com/snail007/goproxy/utils"
+)
+
+const leakyBufSize = 4108 // data.len(2) + hmacsha1(10) + data(4096)
+const maxNBuf = 2048
+
+var leakyBuf = utils.NewLeakyBuf(maxNBuf, leakyBufSize)
+
+const (
+	idType  = 0 // address type index
+	idIP0   = 1 // ip addres start index
+	idDmLen = 1 // domain address length index
+	idDm0   = 2 // domain address start index
+
+	typeIPv4 = 1 // type is ipv4 address
+	typeDm   = 3 // type is domain address
+	typeIPv6 = 4 // type is ipv6 address
+
+	lenIPv4     = net.IPv4len + 2 // ipv4 + 2port
+	lenIPv6     = net.IPv6len + 2 // ipv6 + 2port
+	lenDmBase   = 2               // 1addrLen + 2port, plus addrLen
+	lenHmacSha1 = 10
+)
+
+func GetRequest(conn *Conn) (host string, err error) {
+
+	// buf size should at least have the same size with the largest possible
+	// request size (when addrType is 3, domain name has at most 256 bytes)
+	// 1(addrType) + 1(lenByte) + 255(max length address) + 2(port) + 10(hmac-sha1)
+	buf := make([]byte, 269)
+	// read till we get possible domain length field
+	if _, err = io.ReadFull(conn, buf[:idType+1]); err != nil {
+		return
+	}
+
+	var reqStart, reqEnd int
+	addrType := buf[idType]
+	switch addrType & AddrMask {
+	case typeIPv4:
+		reqStart, reqEnd = idIP0, idIP0+lenIPv4
+	case typeIPv6:
+		reqStart, reqEnd = idIP0, idIP0+lenIPv6
+	case typeDm:
+		if _, err = io.ReadFull(conn, buf[idType+1:idDmLen+1]); err != nil {
+			return
+		}
+		reqStart, reqEnd = idDm0, idDm0+int(buf[idDmLen])+lenDmBase
+	default:
+		err = fmt.Errorf("addr type %d not supported", addrType&AddrMask)
+		return
+	}
+
+	if _, err = io.ReadFull(conn, buf[reqStart:reqEnd]); err != nil {
+		return
+	}
+
+	// Return string for typeIP is not most efficient, but browsers (Chrome,
+	// Safari, Firefox) all seems using typeDm exclusively. So this is not a
+	// big problem.
+	switch addrType & AddrMask {
+	case typeIPv4:
+		host = net.IP(buf[idIP0 : idIP0+net.IPv4len]).String()
+	case typeIPv6:
+		host = net.IP(buf[idIP0 : idIP0+net.IPv6len]).String()
+	case typeDm:
+		host = string(buf[idDm0 : idDm0+int(buf[idDmLen])])
+	}
+	// parse port
+	port := binary.BigEndian.Uint16(buf[reqEnd-2 : reqEnd])
+	host = net.JoinHostPort(host, strconv.Itoa(int(port)))
+
+	return
+}
--- a/utils/structs.go
+++ b/utils/structs.go
@ -3,7 +3,6 @@ package utils
 import (
 	"bufio"
 	"bytes"
-	"crypto/tls"
 	"encoding/base64"
 	"errors"
 	"fmt"
@ -12,21 +11,22 @@ import (
 	logger "log"
 	"net"
 	"net/url"
+	"runtime/debug"
 	"strings"
 	"sync"
 	"time"

-	"github.com/snail007/goproxy/services/kcpcfg"
+	"github.com/snail007/goproxy/utils/dnsx"
+	"github.com/snail007/goproxy/utils/mapx"
 	"github.com/snail007/goproxy/utils/sni"

 	"github.com/golang/snappy"
-	"github.com/miekg/dns"
 )

 type Checker struct {
-	data       ConcurrentMap
-	blockedMap ConcurrentMap
-	directMap  ConcurrentMap
+	data       mapx.ConcurrentMap
+	blockedMap mapx.ConcurrentMap
+	directMap  mapx.ConcurrentMap
 	interval   int64
 	timeout    int
 	isStop     bool
@ -45,7 +45,7 @@ type CheckerItem struct {
 //interval: recheck domain interval seconds
 func NewChecker(timeout int, interval int64, blockedFile, directFile string, log *logger.Logger) Checker {
 	ch := Checker{
-		data:     NewConcurrentMap(),
+		data:     mapx.NewConcurrentMap(),
 		interval: interval,
 		timeout:  timeout,
 		isStop:   false,
@ -66,8 +66,8 @@ func NewChecker(timeout int, interval int64, blockedFile, directFile string, log
 	return ch
 }

-func (c *Checker) loadMap(f string) (dataMap ConcurrentMap) {
-	dataMap = NewConcurrentMap()
+func (c *Checker) loadMap(f string) (dataMap mapx.ConcurrentMap) {
+	dataMap = mapx.NewConcurrentMap()
 	if PathExists(f) {
 		_contents, err := ioutil.ReadFile(f)
 		if err != nil {
@ -88,11 +88,21 @@ func (c *Checker) Stop() {
 }
 func (c *Checker) start() {
 	go func() {
+		defer func() {
+			if e := recover(); e != nil {
+				fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+			}
+		}()
 		//log.Printf("checker started")
 		for {
 			//log.Printf("checker did")
 			for _, v := range c.data.Items() {
 				go func(item CheckerItem) {
+					defer func() {
+						if e := recover(); e != nil {
+							fmt.Printf("crashed, err: %s\nstack:%s", e, string(debug.Stack()))
+						}
+					}()
 					if c.isNeedCheck(item) {
 						//log.Printf("check %s", item.Host)
 						var conn net.Conn
@ -166,11 +176,9 @@ func (c *Checker) domainIsInMap(address string, blockedMap bool) bool {
 	}
 	domainSlice := strings.Split(u.Hostname(), ".")
 	if len(domainSlice) > 1 {
-		subSlice := domainSlice[:len(domainSlice)-1]
-		topDomain := strings.Join(domainSlice[len(domainSlice)-1:], ".")
-		checkDomain := topDomain
-		for i := len(subSlice) - 1; i >= 0; i-- {
-			checkDomain = subSlice[i] + "." + checkDomain
+		checkDomain := ""
+		for i := len(domainSlice) - 1; i >= 0; i-- {
+			checkDomain = strings.Join(domainSlice[i:], ".")
 			if !blockedMap && c.directMap.Has(checkDomain) {
 				return true
 			}
@ -198,18 +206,18 @@ func (c *Checker) Add(domain, address string) {
 }

 type BasicAuth struct {
-	data        ConcurrentMap
+	data        mapx.ConcurrentMap
 	authURL     string
 	authOkCode  int
 	authTimeout int
 	authRetry   int
-	dns         *DomainResolver
+	dns         *dnsx.DomainResolver
 	log         *logger.Logger
 }

-func NewBasicAuth(dns *DomainResolver, log *logger.Logger) BasicAuth {
+func NewBasicAuth(dns *dnsx.DomainResolver, log *logger.Logger) BasicAuth {
 	return BasicAuth{
-		data: NewConcurrentMap(),
+		data: mapx.NewConcurrentMap(),
 		dns:  dns,
 		log:  log,
 	}
@ -528,53 +536,15 @@ func (req *HTTPRequest) addPortIfNot() (newHost string) {
 	return
 }

-type OutConn struct {
-	dur         int
-	typ         string
-	certBytes   []byte
-	keyBytes    []byte
-	caCertBytes []byte
-	kcp         kcpcfg.KCPConfigArgs
-	address     string
-	timeout     int
-}
-
-func NewOutConn(dur int, typ string, kcp kcpcfg.KCPConfigArgs, certBytes, keyBytes, caCertBytes []byte, address string, timeout int) (op OutConn) {
-	return OutConn{
-		dur:         dur,
-		typ:         typ,
-		certBytes:   certBytes,
-		keyBytes:    keyBytes,
-		caCertBytes: caCertBytes,
-		kcp:         kcp,
-		address:     address,
-		timeout:     timeout,
-	}
-}
-func (op *OutConn) Get() (conn net.Conn, err error) {
-	if op.typ == "tls" {
-		var _conn tls.Conn
-		_conn, err = TlsConnectHost(op.address, op.timeout, op.certBytes, op.keyBytes, op.caCertBytes)
-		if err == nil {
-			conn = net.Conn(&_conn)
-		}
-	} else if op.typ == "kcp" {
-		conn, err = ConnectKCPHost(op.address, op.kcp)
-	} else {
-		conn, err = ConnectHost(op.address, op.timeout)
-	}
-	return
-}
-
 type ConnManager struct {
-	pool ConcurrentMap
+	pool mapx.ConcurrentMap
 	l    *sync.Mutex
 	log  *logger.Logger
 }

 func NewConnManager(log *logger.Logger) ConnManager {
 	cm := ConnManager{
-		pool: NewConcurrentMap(),
+		pool: mapx.NewConcurrentMap(),
 		l:    &sync.Mutex{},
 		log:  log,
 	}
@ -582,11 +552,11 @@ func NewConnManager(log *logger.Logger) ConnManager {
 }
 func (cm *ConnManager) Add(key, ID string, conn *net.Conn) {
 	cm.pool.Upsert(key, nil, func(exist bool, valueInMap interface{}, newValue interface{}) interface{} {
-		var conns ConcurrentMap
+		var conns mapx.ConcurrentMap
 		if !exist {
-			conns = NewConcurrentMap()
+			conns = mapx.NewConcurrentMap()
 		} else {
-			conns = valueInMap.(ConcurrentMap)
+			conns = valueInMap.(mapx.ConcurrentMap)
 		}
 		if conns.Has(ID) {
 			v, _ := conns.Get(ID)
@ -598,9 +568,9 @@ func (cm *ConnManager) Add(key, ID string, conn *net.Conn) {
 	})
 }
 func (cm *ConnManager) Remove(key string) {
-	var conns ConcurrentMap
+	var conns mapx.ConcurrentMap
 	if v, ok := cm.pool.Get(key); ok {
-		conns = v.(ConcurrentMap)
+		conns = v.(mapx.ConcurrentMap)
 		conns.IterCb(func(key string, v interface{}) {
 			CloseConn(v.(*net.Conn))
 		})
@ -611,9 +581,9 @@ func (cm *ConnManager) Remove(key string) {
 func (cm *ConnManager) RemoveOne(key string, ID string) {
 	defer cm.l.Unlock()
 	cm.l.Lock()
-	var conns ConcurrentMap
+	var conns mapx.ConcurrentMap
 	if v, ok := cm.pool.Get(key); ok {
-		conns = v.(ConcurrentMap)
+		conns = v.(mapx.ConcurrentMap)
 		if conns.Has(ID) {
 			v, _ := conns.Get(ID)
 			(*v.(*net.Conn)).Close()
@ -631,11 +601,11 @@ func (cm *ConnManager) RemoveAll() {

 type ClientKeyRouter struct {
 	keyChan chan string
-	ctrl    *ConcurrentMap
+	ctrl    *mapx.ConcurrentMap
 	lock    *sync.Mutex
 }

-func NewClientKeyRouter(ctrl *ConcurrentMap, size int) ClientKeyRouter {
+func NewClientKeyRouter(ctrl *mapx.ConcurrentMap, size int) ClientKeyRouter {
 	return ClientKeyRouter{
 		keyChan: make(chan string, size),
 		ctrl:    ctrl,
@ -671,103 +641,6 @@ func (c *ClientKeyRouter) GetKey() string {

 }

-type DomainResolver struct {
-	ttl         int
-	dnsAddrress string
-	data        ConcurrentMap
-	log         *logger.Logger
-}
-type DomainResolverItem struct {
-	ip        string
-	domain    string
-	expiredAt int64
-}
-
-func NewDomainResolver(dnsAddrress string, ttl int, log *logger.Logger) DomainResolver {
-	return DomainResolver{
-		ttl:         ttl,
-		dnsAddrress: dnsAddrress,
-		data:        NewConcurrentMap(),
-		log:         log,
-	}
-}
-func (a *DomainResolver) MustResolve(address string) (ip string) {
-	ip, _ = a.Resolve(address)
-	return
-}
-func (a *DomainResolver) Resolve(address string) (ip string, err error) {
-	domain := address
-	port := ""
-	fromCache := "false"
-	defer func() {
-		if port != "" {
-			ip = net.JoinHostPort(ip, port)
-		}
-		a.log.Printf("dns:%s->%s,cache:%s", address, ip, fromCache)
-		//a.PrintData()
-	}()
-	if strings.Contains(domain, ":") {
-		domain, port, err = net.SplitHostPort(domain)
-		if err != nil {
-			return
-		}
-	}
-	if net.ParseIP(domain) != nil {
-		ip = domain
-		fromCache = "ip ignore"
-		return
-	}
-	item, ok := a.data.Get(domain)
-	if ok {
-		//log.Println("find ", domain)
-		if (*item.(*DomainResolverItem)).expiredAt > time.Now().Unix() {
-			ip = (*item.(*DomainResolverItem)).ip
-			fromCache = "true"
-			//log.Println("from cache ", domain)
-			return
-		}
-	} else {
-		item = &DomainResolverItem{
-			domain: domain,
-		}
-
-	}
-	c := new(dns.Client)
-	c.DialTimeout = time.Millisecond * 5000
-	c.ReadTimeout = time.Millisecond * 5000
-	c.WriteTimeout = time.Millisecond * 5000
-	m := new(dns.Msg)
-	m.SetQuestion(dns.Fqdn(domain), dns.TypeA)
-	m.RecursionDesired = true
-	r, _, err := c.Exchange(m, a.dnsAddrress)
-	if r == nil {
-		return
-	}
-	if r.Rcode != dns.RcodeSuccess {
-		err = fmt.Errorf(" *** invalid answer name %s after A query for %s", domain, a.dnsAddrress)
-		return
-	}
-	for _, answer := range r.Answer {
-		if answer.Header().Rrtype == dns.TypeA {
-			info := strings.Fields(answer.String())
-			if len(info) >= 5 {
-				ip = info[4]
-				_item := item.(*DomainResolverItem)
-				(*_item).expiredAt = time.Now().Unix() + int64(a.ttl)
-				(*_item).ip = ip
-				a.data.Set(domain, item)
-				return
-			}
-		}
-	}
-	return
-}
-func (a *DomainResolver) PrintData() {
-	for k, item := range a.data.Items() {
-		d := item.(*DomainResolverItem)
-		a.log.Printf("%s:ip[%s],domain[%s],expired at[%d]\n", k, (*d).ip, (*d).domain, (*d).expiredAt)
-	}
-}
 func NewCompStream(conn net.Conn) *CompStream {
 	c := new(CompStream)
 	c.conn = conn
Author	SHA1	Message	Date
arraykeys@gmail.com	ef8737063b	v6.1	2018-09-19 12:14:16 +08:00
arraykeys@gmail.com	b5e0fa4895	v6.1	2018-09-19 11:51:01 +08:00
arraykeys@gmail.com	02513a9449	fix #146 server channel统一使用core	2018-09-19 11:34:34 +08:00
arraykeys@gmail.com	0859452475	优化负载均衡,当只有一个节点的时候,不再启动健康检查.	2018-09-18 16:14:06 +08:00
arraykeys@gmail.com	42d18ca1d3	优化负载均衡,当只有一个节点的时候,不再启动健康检查.	2018-09-18 16:08:59 +08:00
arraykeys@gmail.com	08b3715bda	a	2018-09-18 15:36:10 +08:00
arraykeys@gmail.com	253783573a	a	2018-09-18 15:34:38 +08:00
arraykeys@gmail.com	56dc3fdc07	a	2018-09-18 11:34:25 +08:00
arraykeys@gmail.com	af20893551	a	2018-09-18 11:30:48 +08:00
arraykeys@gmail.com	85178223e0	5.优化了DST,防止意外crash. 6.修复了mapx的Keys()方法的bug导致内网穿透bridge不稳定的问题.	2018-09-14 18:20:45 +08:00
arraykeys@gmail.com	e116bf8897	update kcpcfg import path	2018-09-14 16:12:56 +08:00
arraykeys@gmail.com	0fffedebd7	优化域名检测	2018-09-14 11:56:11 +08:00
arraykeys@gmail.com	1e259b5c6f	优化crashed日志	2018-09-14 11:48:51 +08:00
arraykeys@gmail.com	7bb5bb86dc	优化crashed日志	2018-09-14 11:47:50 +08:00
snail007	18716cb3a2	Merge pull request #143 from Quasilyte/quasilyte/docStub core/tproxy: replace doc-comment stubs	2018-09-14 11:43:36 +08:00
snail007	1aca777c6d	Merge pull request #142 from Quasilyte/quasilyte/underef simplify (*x).f to x.f where it does not change the semantics	2018-09-14 11:42:34 +08:00
snail007	3a5b47b84a	Merge pull request #141 from Quasilyte/quasilyte/commentedOutCode remove some commented-out (dead) code	2018-09-14 11:40:51 +08:00
snail007	8bda30c4cf	Merge pull request #140 from Quasilyte/quasilyte/emptyFallthrough services: simplify switch statements with case clause lists	2018-09-14 11:37:25 +08:00
snail007	03ef384c48	Update install_auto.sh	2018-09-14 11:37:06 +08:00
Iskander Sharipov	5ace1eef1d	core/tproxy: replace doc-comment stubs Found using https://go-critic.github.io/overview#docStub-ref	2018-09-13 21:31:05 +03:00
Iskander Sharipov	d270b4a468	simplify (*x).f to x.f where it does not change the semantics Found using https://go-critic.github.io/overview#underef-ref	2018-09-13 21:16:50 +03:00
Iskander Sharipov	6154d4173a	remove some commented-out (dead) code There are much more places, removed only few of them to make review simpler (we can remove more later). Found using https://go-critic.github.io/overview#commentedOutCode-ref	2018-09-13 21:04:07 +03:00
Iskander Sharipov	70067d67b9	services: simplify switch statements with case clause lists Case clause lists are simpler and more compact than multiple cases with fallthrough. Found using https://go-critic.github.io/overview#emptyFallthrough-ref	2018-09-13 20:46:16 +03:00
arraykeys@gmail.com	8befdbc89c	黑白名单支持设置顶级域了,比如:com,匹配所有的.com域名	2018-09-12 11:20:03 +08:00
snail007	900b975c6a	Update install_auto.sh	2018-09-11 19:30:47 +08:00
snail007	2ddb03a6c7	Merge pull request #139 from snail007/master 6.1	2018-09-11 19:29:16 +08:00
arraykeys@gmail.com	4145a31e5b	黑白名单支持设置顶级域了,比如:com,匹配所有的.com域名	2018-09-11 18:37:09 +08:00
arraykeys@gmail.com	96717f0c33	减少buf大小,降低高并发情况下内存占用量.	2018-09-10 14:42:04 +08:00
arraykeys@gmail.com	09348211b6	优化TCPS内存释放	2018-09-10 13:56:59 +08:00
arraykeys@gmail.com	179f9d63ab	Merge remote-tracking branch 'origin/master'	2018-09-10 13:40:42 +08:00
arraykeys@gmail.com	7692446fd8	优化TCPS内存释放	2018-09-10 13:40:15 +08:00
snail007	0bebee1537	Merge pull request #133 from snail007/dev update readme	2018-09-07 09:09:35 +08:00
snail007	61569c3a92	Merge pull request #132 from yincongcyincong/dev Dev	2018-09-07 09:07:16 +08:00
yincongcyincong	0d6e10ad33	Update README.md	2018-09-07 08:53:17 +08:00
yincongcyincong	77a6300dae	Update README.md	2018-09-06 18:48:07 +08:00
yincongcyincong	8f268b8b56	Update README.md	2018-09-06 18:04:10 +08:00
arraykeys@gmail.com	efb5710727	v6.0	2018-09-06 16:16:10 +08:00
arraykeys@gmail.com	7fc0b21764	Merge branch 'dev'	2018-09-06 16:10:00 +08:00
snail007	2f524010a1	Merge pull request #131 from smlrepo/master fix build breakage	2018-09-06 16:09:18 +08:00
Lonnie Liu	c537240d3d	fix build breakage	2018-09-06 00:31:02 -07:00
yincongcyincong	d3640f7519	Update README.md	2018-09-06 14:06:23 +08:00
arraykeys@gmail.com	6339e1ff53	Merge branch 'dev'	2018-09-06 12:41:47 +08:00
arraykeys@gmail.com	55098e2d22	v6.0	2018-09-06 12:14:03 +08:00
arraykeys@gmail.com	5a81229a9c	优化udp代理	2018-09-05 18:11:28 +08:00
arraykeys@gmail.com	7d59d9ce4d	优化udp代理	2018-09-05 18:02:31 +08:00
yincongcyincong	575326bed1	Update README.md	2018-09-05 17:32:53 +08:00
arraykeys@gmail.com	20ed5b1c7b	优化错误捕获,防止意外crash 优化停止服务,释放内存	2018-09-05 15:10:33 +08:00
arraykeys@gmail.com	997f438dfb	优化错误捕获,防止意外crash 优化停止服务,释放内存	2018-09-05 15:00:31 +08:00
arraykeys@gmail.com	e2f7377259	Merge branch 'devtomerge' into dev	2018-09-05 11:45:45 +08:00
arraykeys@gmail.com	6fb3457bd2	optimise tunnel nat udp module	2018-09-05 11:43:53 +08:00
snail007	462ae3deff	Update CHANGELOG	2018-09-04 22:21:38 +08:00
arraykeys@gmail.com	44fd8b383b	add core	2018-09-04 18:00:27 +08:00
arraykeys@gmail.com	ade587db6d	add core	2018-09-04 17:56:38 +08:00
arraykeys@gmail.com	9a1f5de686	add core	2018-09-04 17:46:43 +08:00
arraykeys@gmail.com	98479e860d	Merge branch 'enterprise' into devtomerge	2018-09-04 17:40:43 +08:00
arraykeys@gmail.com	6f71eef98f	Merge branch 'enterprise' into devtomerge	2018-09-04 17:36:03 +08:00
arraykeys@gmail.com	b76458722b	Merge branch 'enterprise' into devtomerge	2018-09-04 17:06:14 +08:00
arraykeys@gmail.com	003538cdaf	Merge branch 'enterprise' into devtomerge	2018-09-04 16:28:03 +08:00
arraykeys@gmail.com	c7c52a0788	Merge branch 'enterprise' into devtomerge	2018-09-04 16:13:44 +08:00
arraykeys@gmail.com	167442e288	Merge branch 'enterprise' into devtomerge	2018-09-04 16:08:12 +08:00
arraykeys@gmail.com	397c5e08f8	merge enterprise	2018-09-04 16:06:44 +08:00
arraykeys@gmail.com	a993b1bb9d	merge enterprise	2018-09-04 16:00:08 +08:00
arraykeys@gmail.com	89be79b6c6	merge enterprise	2018-09-04 15:59:57 +08:00
arraykeys@gmail.com	4d1c9ffa1f	a	2018-09-04 15:09:08 +08:00
snail007	1d7eee0e69	Merge pull request #130 from okcy1016/master Update README_ZH.md	2018-08-31 23:01:20 +08:00
ChaosYoung	bb0ddf3cec	Update README_ZH.md	2018-08-31 21:38:14 +08:00
arraykeys@gmail.com	b3876d21be	update README.md for v5.4	2018-08-30 17:23:05 +08:00
snail007	a26d7ea2c2	Merge pull request #129 from yincongcyincong/dev Dev	2018-08-30 17:20:36 +08:00
yincongcyincong	249ce1a6d3	Merge branch 'dev' into dev	2018-08-30 17:17:21 +08:00
yincongcyincong	3280e82da3	Update README.md	2018-08-30 17:14:51 +08:00
yincongcyincong	2aab40624f	Update README.md	2018-08-30 17:12:15 +08:00
arraykeys@gmail.com	187a3f58dd	优化多连接版本内网穿透连接释放逻辑	2018-08-30 17:00:21 +08:00
arraykeys@gmail.com	0de6c174a2	update sdk to v5.4	2018-08-30 16:35:31 +08:00
arraykeys@gmail.com	f9a2c3cd75	update sdk to v5.4	2018-08-30 16:35:06 +08:00
arraykeys@gmail.com	a3eb0bfde9	Merge branch 'dev'	2018-08-30 16:10:28 +08:00
arraykeys@gmail.com	33e665631d	v5.4	2018-08-30 16:09:58 +08:00
arraykeys@gmail.com	375eb9aa66	v5.4	2018-08-30 15:34:13 +08:00
arraykeys@gmail.com	889ce76676	优化sdk,支持并发启动/关闭操作	2018-08-24 11:41:15 +08:00
arraykeys@gmail.com	abdcae31c9	优化sdk,支持并发启动/关闭操作	2018-08-24 11:40:36 +08:00
arraykeys@gmail.com	c9f8f6c6fb	fix GetAllInterfaceAddr cpu high	2018-08-21 10:52:18 +08:00
arraykeys@gmail.com	aab899397e	fix GetAllInterfaceAddr cpu high	2018-08-21 10:29:51 +08:00
arraykeys@gmail.com	a933322ef7	Merge branch 'dev'	2018-08-06 16:07:24 +08:00
arraykeys@gmail.com	b9f054c495	v5.3	2018-08-06 16:06:43 +08:00
arraykeys@gmail.com	5c2e6fd109	a	2018-07-24 17:25:04 +08:00
arraykeys@gmail.com	e427263ccf	a	2018-07-24 12:10:24 +08:00
arraykeys@gmail.com	a1a2c3f985	sdk5.3	2018-07-24 11:31:16 +08:00
arraykeys@gmail.com	84458a10e4	Merge remote-tracking branch 'origin/dev' into dev	2018-07-18 11:01:46 +08:00
snail007	9dd7bf80c5	Merge pull request #114 from schmich/fix-typo Fix typo	2018-07-18 09:09:59 +08:00
Chris Schmich	317d0113fb	Fix typo: 'stoped' -> 'stopped'.	2018-07-17 14:02:38 -07:00
arraykeys@gmail.com	53153da2e6	a	2018-07-17 17:55:54 +08:00
arraykeys@gmail.com	747a94a1c8	fix #113	2018-07-17 16:00:48 +08:00
arraykeys@gmail.com	df94ca5601	a	2018-07-16 18:32:53 +08:00
arraykeys@gmail.com	3cf7788f34	a	2018-07-16 18:10:21 +08:00
arraykeys@gmail.com	af91921070	a	2018-07-16 16:18:34 +08:00
arraykeys@gmail.com	7fc5c30f60	fix docker file	2018-07-16 15:54:55 +08:00
arraykeys@gmail.com	c4a7f0fbb0	Merge remote-tracking branch 'origin/dev' into dev	2018-07-12 13:34:18 +08:00
arraykeys@gmail.com	f656773858	优化智能检查的初始化时机	2018-07-12 13:32:46 +08:00
snail007	e208ccee18	Merge pull request #110 from boboanvip/dev net.LookupIP may cause deadlock in windows	2018-07-12 12:38:20 +08:00
boboan	5980fee788	net.LookupIP may cause deadlock in windows	2018-07-12 10:31:54 +08:00
boboanvip	61f791e77d	Merge branch 'dev' into dev	2018-07-12 10:28:32 +08:00
boboan	907dec42e0	net.LookupIP may cause deadlock in windows https://github.com/golang/go/issues/24178	2018-07-12 10:21:28 +08:00
arraykeys	8dce99fec6	a	2018-07-11 21:35:02 +08:00
snail007	db13b83f44	Merge pull request #109 from boboanvip/master fix net.LookupIP may cause deadlock in windows	2018-07-11 20:50:58 +08:00
boboan	dd8d7dd0d4	net.LookupIP may cause deadlock in windows https://github.com/golang/go/issues/24178	2018-07-11 17:45:35 +08:00
arraykeys@gmail.com	dd355b5d98	fix socks client check port range	2018-07-10 16:26:26 +08:00
arraykeys@gmail.com	1e1999dede	a	2018-07-10 13:37:00 +08:00
snail007	bb933cfb6e	Merge pull request #108 from snail007/dev docs	2018-07-09 20:33:31 +08:00
arraykeys	2603802dd9	no message	2018-07-09 20:18:30 +08:00