284 lines
7.2 KiB
Go
284 lines
7.2 KiB
Go
package services
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import (
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"crypto/tls"
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"fmt"
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"io"
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"log"
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"net"
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"snail007/proxy/utils"
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"time"
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)
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type TunnelClient struct {
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cfg TunnelClientArgs
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// cm utils.ConnManager
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ctrlConn net.Conn
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}
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func NewTunnelClient() Service {
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return &TunnelClient{
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cfg: TunnelClientArgs{},
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// cm: utils.NewConnManager(),
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}
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}
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func (s *TunnelClient) InitService() {
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// s.InitHeartbeatDeamon()
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}
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// func (s *TunnelClient) InitHeartbeatDeamon() {
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// log.Printf("heartbeat started")
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// go func() {
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// var heartbeatConn net.Conn
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// var ID = *s.cfg.Key
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// for {
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// //close all connection
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// s.cm.RemoveAll()
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// if s.ctrlConn != nil {
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// s.ctrlConn.Close()
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// }
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// utils.CloseConn(&heartbeatConn)
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// heartbeatConn, err := s.GetInConn(CONN_CLIENT_HEARBEAT, ID)
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// if err != nil {
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// log.Printf("heartbeat connection err: %s, retrying...", err)
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// time.Sleep(time.Second * 3)
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// utils.CloseConn(&heartbeatConn)
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// continue
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// }
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// log.Printf("heartbeat connection created,id:%s", ID)
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// writeDie := make(chan bool)
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// readDie := make(chan bool)
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// go func() {
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// for {
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// heartbeatConn.SetWriteDeadline(time.Now().Add(time.Second * 3))
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// _, err = heartbeatConn.Write([]byte{0x00})
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// heartbeatConn.SetWriteDeadline(time.Time{})
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// if err != nil {
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// log.Printf("heartbeat connection write err %s", err)
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// break
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// }
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// time.Sleep(time.Second * 3)
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// }
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// close(writeDie)
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// }()
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// go func() {
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// for {
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// signal := make([]byte, 1)
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// heartbeatConn.SetReadDeadline(time.Now().Add(time.Second * 6))
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// _, err := heartbeatConn.Read(signal)
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// heartbeatConn.SetReadDeadline(time.Time{})
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// if err != nil {
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// log.Printf("heartbeat connection read err: %s", err)
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// break
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// } else {
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// //log.Printf("heartbeat from bridge")
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// }
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// }
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// close(readDie)
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// }()
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// select {
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// case <-readDie:
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// case <-writeDie:
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// }
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// }
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// }()
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// }
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func (s *TunnelClient) CheckArgs() {
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if *s.cfg.Parent != "" {
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log.Printf("use tls parent %s", *s.cfg.Parent)
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} else {
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log.Fatalf("parent required")
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}
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if *s.cfg.CertFile == "" || *s.cfg.KeyFile == "" {
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log.Fatalf("cert and key file required")
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}
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s.cfg.CertBytes, s.cfg.KeyBytes = utils.TlsBytes(*s.cfg.CertFile, *s.cfg.KeyFile)
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}
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func (s *TunnelClient) StopService() {
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// s.cm.RemoveAll()
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}
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func (s *TunnelClient) Start(args interface{}) (err error) {
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s.cfg = args.(TunnelClientArgs)
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s.CheckArgs()
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s.InitService()
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log.Printf("proxy on tunnel client mode")
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for {
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//close all conn
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// s.cm.Remove(*s.cfg.Key)
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if s.ctrlConn != nil {
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s.ctrlConn.Close()
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}
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s.ctrlConn, err = s.GetInConn(CONN_CLIENT_CONTROL, *s.cfg.Key)
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if err != nil {
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log.Printf("control connection err: %s, retrying...", err)
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time.Sleep(time.Second * 3)
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if s.ctrlConn != nil {
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s.ctrlConn.Close()
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}
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continue
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}
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for {
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var ID, clientLocalAddr, serverID string
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err = utils.ReadPacketData(s.ctrlConn, &ID, &clientLocalAddr, &serverID)
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if err != nil {
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if s.ctrlConn != nil {
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s.ctrlConn.Close()
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}
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log.Printf("read connection signal err: %s, retrying...", err)
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break
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}
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log.Printf("signal revecived:%s %s %s", serverID, ID, clientLocalAddr)
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protocol := clientLocalAddr[:3]
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localAddr := clientLocalAddr[4:]
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if protocol == "udp" {
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go s.ServeUDP(localAddr, ID, serverID)
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} else {
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go s.ServeConn(localAddr, ID, serverID)
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}
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}
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}
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}
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func (s *TunnelClient) Clean() {
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s.StopService()
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}
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func (s *TunnelClient) GetInConn(typ uint8, data ...string) (outConn net.Conn, err error) {
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outConn, err = s.GetConn()
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if err != nil {
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err = fmt.Errorf("connection err: %s", err)
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return
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}
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_, err = outConn.Write(utils.BuildPacket(typ, data...))
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if err != nil {
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err = fmt.Errorf("write connection data err: %s ,retrying...", err)
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utils.CloseConn(&outConn)
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return
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}
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return
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}
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func (s *TunnelClient) GetConn() (conn net.Conn, err error) {
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var _conn tls.Conn
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_conn, err = utils.TlsConnectHost(*s.cfg.Parent, *s.cfg.Timeout, s.cfg.CertBytes, s.cfg.KeyBytes, nil)
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if err == nil {
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conn = net.Conn(&_conn)
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}
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return
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}
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func (s *TunnelClient) ServeUDP(localAddr, ID, serverID string) {
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var inConn net.Conn
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var err error
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// for {
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for {
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// s.cm.RemoveOne(*s.cfg.Key, ID)
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inConn, err = s.GetInConn(CONN_CLIENT, *s.cfg.Key, ID, serverID)
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if err != nil {
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utils.CloseConn(&inConn)
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log.Printf("connection err: %s, retrying...", err)
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time.Sleep(time.Second * 3)
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continue
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} else {
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break
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}
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}
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// s.cm.Add(*s.cfg.Key, ID, &inConn)
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log.Printf("conn %s created", ID)
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for {
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srcAddr, body, err := utils.ReadUDPPacket(inConn)
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if err == io.EOF || err == io.ErrUnexpectedEOF {
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log.Printf("connection %s released", ID)
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utils.CloseConn(&inConn)
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break
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} else if err != nil {
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log.Printf("udp packet revecived fail, err: %s", err)
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} else {
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//log.Printf("udp packet revecived:%s,%v", srcAddr, body)
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go s.processUDPPacket(&inConn, srcAddr, localAddr, body)
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}
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}
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// }
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}
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func (s *TunnelClient) processUDPPacket(inConn *net.Conn, srcAddr, localAddr string, body []byte) {
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dstAddr, err := net.ResolveUDPAddr("udp", localAddr)
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if err != nil {
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log.Printf("can't resolve address: %s", err)
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utils.CloseConn(inConn)
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return
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}
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clientSrcAddr := &net.UDPAddr{IP: net.IPv4zero, Port: 0}
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conn, err := net.DialUDP("udp", clientSrcAddr, dstAddr)
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if err != nil {
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log.Printf("connect to udp %s fail,ERR:%s", dstAddr.String(), err)
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return
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}
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conn.SetDeadline(time.Now().Add(time.Millisecond * time.Duration(*s.cfg.Timeout)))
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_, err = conn.Write(body)
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if err != nil {
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log.Printf("send udp packet to %s fail,ERR:%s", dstAddr.String(), err)
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return
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}
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//log.Printf("send udp packet to %s success", dstAddr.String())
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buf := make([]byte, 1024)
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length, _, err := conn.ReadFromUDP(buf)
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if err != nil {
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log.Printf("read udp response from %s fail ,ERR:%s", dstAddr.String(), err)
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return
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}
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respBody := buf[0:length]
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//log.Printf("revecived udp packet from %s , %v", dstAddr.String(), respBody)
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bs := utils.UDPPacket(srcAddr, respBody)
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_, err = (*inConn).Write(bs)
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if err != nil {
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log.Printf("send udp response fail ,ERR:%s", err)
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utils.CloseConn(inConn)
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return
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}
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//log.Printf("send udp response success ,from:%s ,%d ,%v", dstAddr.String(), len(bs), bs)
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}
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func (s *TunnelClient) ServeConn(localAddr, ID, serverID string) {
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var inConn, outConn net.Conn
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var err error
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for {
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inConn, err = s.GetInConn(CONN_CLIENT, *s.cfg.Key, ID, serverID)
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if err != nil {
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utils.CloseConn(&inConn)
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log.Printf("connection err: %s, retrying...", err)
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time.Sleep(time.Second * 3)
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continue
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} else {
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break
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}
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}
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i := 0
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for {
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i++
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outConn, err = utils.ConnectHost(localAddr, *s.cfg.Timeout)
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if err == nil || i == 3 {
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break
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} else {
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if i == 3 {
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log.Printf("connect to %s err: %s, retrying...", localAddr, err)
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time.Sleep(2 * time.Second)
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continue
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}
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}
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}
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if err != nil {
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utils.CloseConn(&inConn)
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utils.CloseConn(&outConn)
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log.Printf("build connection error, err: %s", err)
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return
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}
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utils.IoBind(inConn, outConn, func(err interface{}) {
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log.Printf("conn %s released", ID)
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// s.cm.RemoveOne(*s.cfg.Key, ID)
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})
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// s.cm.Add(*s.cfg.Key, ID, &inConn)
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log.Printf("conn %s created", ID)
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}
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