371 lines
8.8 KiB
Go
371 lines
8.8 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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"math/rand"
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"net"
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"runtime/debug"
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"snail007/proxy/utils"
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"strconv"
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"strings"
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"time"
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"github.com/golang/snappy"
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"github.com/xtaci/smux"
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)
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type MuxServer struct {
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cfg MuxServerArgs
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udpChn chan MuxUDPItem
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sc utils.ServerChannel
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sessions utils.ConcurrentMap
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lockChn chan bool
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}
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type MuxServerManager struct {
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cfg MuxServerArgs
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udpChn chan MuxUDPItem
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sc utils.ServerChannel
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serverID string
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}
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func NewMuxServerManager() Service {
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return &MuxServerManager{
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cfg: MuxServerArgs{},
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udpChn: make(chan MuxUDPItem, 50000),
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serverID: utils.Uniqueid(),
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}
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}
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func (s *MuxServerManager) Start(args interface{}) (err error) {
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s.cfg = args.(MuxServerArgs)
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s.CheckArgs()
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if *s.cfg.Parent != "" {
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log.Printf("use %s parent %s", *s.cfg.ParentType, *s.cfg.Parent)
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} else {
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log.Fatalf("parent required")
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}
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s.InitService()
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log.Printf("server id: %s", s.serverID)
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//log.Printf("route:%v", *s.cfg.Route)
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for _, _info := range *s.cfg.Route {
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if _info == "" {
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continue
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}
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IsUDP := *s.cfg.IsUDP
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if strings.HasPrefix(_info, "udp://") {
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IsUDP = true
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}
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info := strings.TrimPrefix(_info, "udp://")
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info = strings.TrimPrefix(info, "tcp://")
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_routeInfo := strings.Split(info, "@")
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server := NewMuxServer()
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local := _routeInfo[0]
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remote := _routeInfo[1]
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KEY := *s.cfg.Key
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if strings.HasPrefix(remote, "[") {
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KEY = remote[1:strings.LastIndex(remote, "]")]
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remote = remote[strings.LastIndex(remote, "]")+1:]
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}
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if strings.HasPrefix(remote, ":") {
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remote = fmt.Sprintf("127.0.0.1%s", remote)
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}
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err = server.Start(MuxServerArgs{
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CertBytes: s.cfg.CertBytes,
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KeyBytes: s.cfg.KeyBytes,
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Parent: s.cfg.Parent,
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CertFile: s.cfg.CertFile,
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KeyFile: s.cfg.KeyFile,
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Local: &local,
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IsUDP: &IsUDP,
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Remote: &remote,
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Key: &KEY,
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Timeout: s.cfg.Timeout,
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Mgr: s,
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IsCompress: s.cfg.IsCompress,
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SessionCount: s.cfg.SessionCount,
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KCP: s.cfg.KCP,
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ParentType: s.cfg.ParentType,
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})
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if err != nil {
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return
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}
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}
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return
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}
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func (s *MuxServerManager) Clean() {
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s.StopService()
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}
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func (s *MuxServerManager) StopService() {
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}
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func (s *MuxServerManager) CheckArgs() {
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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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if *s.cfg.ParentType == "tls" {
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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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}
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func (s *MuxServerManager) InitService() {
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}
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func NewMuxServer() Service {
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return &MuxServer{
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cfg: MuxServerArgs{},
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udpChn: make(chan MuxUDPItem, 50000),
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lockChn: make(chan bool, 1),
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sessions: utils.NewConcurrentMap(),
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}
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}
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type MuxUDPItem struct {
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packet *[]byte
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localAddr *net.UDPAddr
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srcAddr *net.UDPAddr
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}
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func (s *MuxServer) InitService() {
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s.UDPConnDeamon()
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}
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func (s *MuxServer) CheckArgs() {
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if *s.cfg.Remote == "" {
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log.Fatalf("remote required")
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}
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}
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func (s *MuxServer) Start(args interface{}) (err error) {
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s.cfg = args.(MuxServerArgs)
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s.CheckArgs()
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s.InitService()
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host, port, _ := net.SplitHostPort(*s.cfg.Local)
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p, _ := strconv.Atoi(port)
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s.sc = utils.NewServerChannel(host, p)
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if *s.cfg.IsUDP {
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err = s.sc.ListenUDP(func(packet []byte, localAddr, srcAddr *net.UDPAddr) {
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s.udpChn <- MuxUDPItem{
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packet: &packet,
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localAddr: localAddr,
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srcAddr: srcAddr,
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}
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})
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if err != nil {
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return
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}
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log.Printf("server on %s", (*s.sc.UDPListener).LocalAddr())
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} else {
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err = s.sc.ListenTCP(func(inConn net.Conn) {
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defer func() {
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if err := recover(); err != nil {
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log.Printf("connection handler crashed with err : %s \nstack: %s", err, string(debug.Stack()))
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}
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}()
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var outConn net.Conn
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var ID string
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for {
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outConn, ID, err = s.GetOutConn()
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if err != nil {
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utils.CloseConn(&outConn)
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log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, 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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log.Printf("%s stream %s created", *s.cfg.Key, ID)
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if *s.cfg.IsCompress {
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die1 := make(chan bool, 1)
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die2 := make(chan bool, 1)
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go func() {
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io.Copy(inConn, snappy.NewReader(outConn))
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die1 <- true
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}()
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go func() {
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io.Copy(snappy.NewWriter(outConn), inConn)
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die2 <- true
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}()
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select {
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case <-die1:
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case <-die2:
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}
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outConn.Close()
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inConn.Close()
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log.Printf("%s stream %s released", *s.cfg.Key, ID)
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} else {
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utils.IoBind(inConn, outConn, func(err interface{}) {
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log.Printf("%s stream %s released", *s.cfg.Key, ID)
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})
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}
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})
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if err != nil {
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return
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}
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log.Printf("server on %s", (*s.sc.Listener).Addr())
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}
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return
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}
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func (s *MuxServer) Clean() {
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}
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func (s *MuxServer) GetOutConn() (outConn net.Conn, ID string, err error) {
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i := 1
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if *s.cfg.SessionCount > 0 {
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i = rand.Intn(*s.cfg.SessionCount)
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}
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outConn, err = s.GetConn(fmt.Sprintf("%d", i))
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if err != nil {
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log.Printf("connection err: %s", err)
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return
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}
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remoteAddr := "tcp:" + *s.cfg.Remote
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if *s.cfg.IsUDP {
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remoteAddr = "udp:" + *s.cfg.Remote
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}
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ID = utils.Uniqueid()
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_, err = outConn.Write(utils.BuildPacketData(ID, remoteAddr, s.cfg.Mgr.serverID))
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if err != nil {
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log.Printf("write stream 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 *MuxServer) GetConn(index string) (conn net.Conn, err error) {
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select {
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case s.lockChn <- true:
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default:
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err = fmt.Errorf("can not connect at same time")
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return
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}
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defer func() {
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<-s.lockChn
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}()
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var session *smux.Session
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_session, ok := s.sessions.Get(index)
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if !ok {
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var c net.Conn
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c, err = s.getParentConn()
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if err != nil {
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return
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}
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_, err = c.Write(utils.BuildPacket(CONN_SERVER, *s.cfg.Key, s.cfg.Mgr.serverID))
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if err != nil {
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c.Close()
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return
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}
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if err == nil {
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session, err = smux.Client(c, nil)
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if err != nil {
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return
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}
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}
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s.sessions.Set(index, session)
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log.Printf("session[%s] created", index)
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} else {
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session = _session.(*smux.Session)
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}
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conn, err = session.OpenStream()
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if err != nil {
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session.Close()
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s.sessions.Remove(index)
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} else {
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go func() {
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for {
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if session.IsClosed() {
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s.sessions.Remove(index)
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break
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}
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time.Sleep(time.Second * 5)
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}
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}()
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}
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return
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}
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func (s *MuxServer) getParentConn() (conn net.Conn, err error) {
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if *s.cfg.ParentType == "tls" {
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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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} else if *s.cfg.ParentType == "kcp" {
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conn, err = utils.ConnectKCPHost(*s.cfg.Parent, s.cfg.KCP)
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} else {
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conn, err = utils.ConnectHost(*s.cfg.Parent, *s.cfg.Timeout)
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}
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return
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}
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func (s *MuxServer) UDPConnDeamon() {
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go func() {
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defer func() {
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if err := recover(); err != nil {
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log.Printf("udp conn deamon crashed with err : %s \nstack: %s", err, string(debug.Stack()))
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}
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}()
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var outConn net.Conn
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var ID string
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var err error
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for {
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item := <-s.udpChn
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RETRY:
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if outConn == nil {
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for {
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outConn, ID, err = s.GetOutConn()
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if err != nil {
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outConn = nil
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utils.CloseConn(&outConn)
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log.Printf("connect to %s fail, err: %s, retrying...", *s.cfg.Parent, err)
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time.Sleep(time.Second * 3)
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continue
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} else {
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go func(outConn net.Conn, ID string) {
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go func() {
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// outConn.Close()
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}()
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for {
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srcAddrFromConn, body, err := utils.ReadUDPPacket(outConn)
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if err != nil {
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log.Printf("parse revecived udp packet fail, err: %s ,%v", err, body)
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log.Printf("UDP deamon connection %s exited", ID)
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break
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}
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//log.Printf("udp packet revecived over parent , local:%s", srcAddrFromConn)
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_srcAddr := strings.Split(srcAddrFromConn, ":")
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if len(_srcAddr) != 2 {
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log.Printf("parse revecived udp packet fail, addr error : %s", srcAddrFromConn)
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continue
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}
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port, _ := strconv.Atoi(_srcAddr[1])
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dstAddr := &net.UDPAddr{IP: net.ParseIP(_srcAddr[0]), Port: port}
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_, err = s.sc.UDPListener.WriteToUDP(body, dstAddr)
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if err != nil {
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log.Printf("udp response to local %s fail,ERR:%s", srcAddrFromConn, err)
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continue
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}
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//log.Printf("udp response to local %s success , %v", srcAddrFromConn, body)
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}
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}(outConn, ID)
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break
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}
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}
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}
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outConn.SetWriteDeadline(time.Now().Add(time.Second))
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_, err = outConn.Write(utils.UDPPacket(item.srcAddr.String(), *item.packet))
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outConn.SetWriteDeadline(time.Time{})
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if err != nil {
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utils.CloseConn(&outConn)
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outConn = nil
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log.Printf("write udp packet to %s fail ,flush err:%s ,retrying...", *s.cfg.Parent, err)
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goto RETRY
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}
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//log.Printf("write packet %v", *item.packet)
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}
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}()
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}
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