Golang shadowsocks.PipeThenClose函数代码示例

func handleConnection(conn net.Conn) {
	if debug {
		debug.Printf("socks connect from %s\n", conn.RemoteAddr().String())
	}
	closed := false
	defer func() {
		if !closed {
			conn.Close()
		}
	}()

	var err error = nil
	if err = handShake(conn); err != nil {
		log.Println("socks handshake:", err)
		return
	}
	rawaddr, addr, err := getRequest(conn)
	if err != nil {
		log.Println("error getting request:", err)
		return
	}
	// Sending connection established message immediately to client.
	// This some round trip time for creating socks connection with the client.
	// But if connection failed, the client will get connection reset error.
	_, err = conn.Write([]byte{0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x08, 0x43})
	if err != nil {
		debug.Println("send connection confirmation:", err)
		return
	}

	remote, err := createServerConn(rawaddr, addr)
	if err != nil {
		if len(servers.srvCipher) > 1 {
			log.Println("Failed connect to all avaiable shadowsocks server")
		}
		return
	}
	defer func() {
		if !closed {
			remote.Close()
		}
	}()

	debug.Println("go ss.PipeThenClose(conn, remote)")
	go ss.PipeThenClose(conn, remote)

	debug.Println("ss.PipeThenClose(remote, conn)")
	ss.PipeThenClose(remote, conn)

	closed = true
	debug.Println("closed connection to", addr)
}

func handleConnection(conn net.Conn) {
	if debug {
		debug.Printf("socks connect from %s\n", conn.RemoteAddr().String())
	}
	closed := false
	defer func() {
		if !closed {
			conn.Close()
		}
	}()

	var err error = nil
	// _ := conn.RemoteAddr().(*net.TCPAddr)
	destAddr, err := getSockOriginalDst(conn)
	if err != nil {
		log.Printf("get original addr error. err:%v", err)
		return
	}

	rawaddr := make([]byte, 1+4+4)
	w := bytes.NewBuffer(rawaddr)
	var adType int8 = 0x01
	binary.Write(w, binary.BigEndian, adType)
	w.Write(destAddr.IP.To4())
	var port int32 = int32(destAddr.Port)
	addr := destAddr.String()
	binary.Write(w, binary.BigEndian, port)
	remote, err := createServerConn(rawaddr, addr)
	if err != nil {
		if len(servers.srvCipher) > 1 {
			log.Println("Failed connect to all avaiable shadowsocks server")
		}
		return
	}
	defer func() {
		if !closed {
			remote.Close()
		}
	}()

	go ss.PipeThenClose(conn, remote)
	ss.PipeThenClose(remote, conn)
	closed = true
	debug.Println("closed connection to", addr)
}

func handleConnection(conn *ss.Conn) {
	var host string

	connCnt++ // this maybe not accurate, but should be enough
	if connCnt-nextLogConnCnt >= 0 {
		// XXX There's no xadd in the atomic package, so it's difficult to log
		// the message only once with low cost. Also note nextLogConnCnt maybe
		// added twice for current peak connection number level.
		log.Printf("Number of client connections reaches %d\n", nextLogConnCnt)
		nextLogConnCnt += logCntDelta
	}

	// function arguments are always evaluated, so surround debug statement
	// with if statement
	if debug {
		debug.Printf("new client %s->%s\n", conn.RemoteAddr().String(), conn.LocalAddr())
	}
	closed := false
	defer func() {
		if debug {
			debug.Printf("closed pipe %s<->%s\n", conn.RemoteAddr(), host)
		}
		connCnt--
		if !closed {
			conn.Close()
		}
	}()

	host, extra, err := getRequest(conn)
	if err != nil {
		log.Println("error getting request", conn.RemoteAddr(), conn.LocalAddr(), err)
		return
	}
	debug.Println("connecting", host)
	remote, err := net.Dial("tcp", host)
	if err != nil {
		if ne, ok := err.(*net.OpError); ok && (ne.Err == syscall.EMFILE || ne.Err == syscall.ENFILE) {
			// log too many open file error
			// EMFILE is process reaches open file limits, ENFILE is system limit
			log.Println("dial error:", err)
		} else {
			log.Println("error connecting to:", host, err)
		}
		return
	}
	defer func() {
		if !closed {
			remote.Close()
		}
	}()
	// write extra bytes read from
	if extra != nil {
		// debug.Println("getRequest read extra data, writing to remote, len", len(extra))
		if _, err = remote.Write(extra); err != nil {
			debug.Println("write request extra error:", err)
			return
		}
	}
	if debug {
		debug.Printf("piping %s<->%s", conn.RemoteAddr(), host)
	}
	go ss.PipeThenClose(conn, remote, ss.SET_TIMEOUT)
	ss.PipeThenClose(remote, conn, ss.NO_TIMEOUT)
	closed = true
	return
}

func (s ShadowsocksTransport) Start() error {
	handler := server.NewHandler(s.Name)

	listener, err := net.Listen("tcp", s.BindAddr)
	if err != nil {
		listener, err = net.Listen("tcp", "127.0.0.1:0")
	}
	if err != nil {
		handler.PrintError("CANNOT BIND TO ANY PORT")
		return errors.New("Cannot bind to any port")
	}

	listener = handler.MonitorListener(listener)
	handler.PrintExpose("socks5", listener.Addr().String())

	config := &ss.Config{
		Server:     s.RemoteHost,
		ServerPort: s.RemotePort,
		Password:   s.Secret,
		LocalPort:  s.BindPort,
		Method:     "aes-256-cfb",
	}

	parseServerConfig(config)

	handler.PrintDone()

	verbose := server.NewOption("verbose")

	if verbose.Has() {
		s.Verbose = true
		ss.SetDebug(true)
		debug = true
	}

	go func() {
		for {
			defer listener.Close()
			conn, err := listener.Accept()
			if err != nil {
				debug.Println("accept:", err)
				continue
			}
			go func(conn net.Conn) {
				conn = handler.MonitorConn(conn)
				if debug {
					debug.Printf("socks connect from %s\n", conn.RemoteAddr().String())
				}
				closed := false
				defer func() {
					if !closed {
						conn.Close()
					}
				}()

				var err error = nil
				if err = handShake(conn); err != nil {
					debug.Printf("socks handshake: %s", err)
					return
				}
				rawaddr, addr, err := getRequest(conn)
				if err != nil {
					debug.Println("error getting request:", err)
					return
				}
				// Sending connection established message immediately to client.
				// This some round trip time for creating socks connection with the client.
				// But if connection failed, the client will get connection reset error.
				_, err = conn.Write([]byte{0x05, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x08, 0x43})
				if err != nil {
					debug.Println("send connection confirmation:", err)
					return
				}

				remote, err := createServerConn(rawaddr, addr)
				if err != nil {
					if len(servers.srvCipher) > 1 {
						debug.Println("Failed connect to all avaiable shadowsocks server")
					}
					return
				}
				handler.TrackOpenConn(addr)
				defer func() {
					if !closed {
						remote.Close()
					}
				}()

				go ss.PipeThenClose(conn, remote)
				ss.PipeThenClose(remote, conn)
				closed = true
				handler.TrackCloseConn(addr)

			}(conn)
		}
	}()
	handler.Wait()
	return nil
}

func handleConnection(conn *ss.Conn, port string, pflag *uint32, openvpn string) {
	var host string

	newConnCnt := atomic.AddUint64(&connCnt, 1) // connCnt++
	if newConnCnt%logCntDelta == 0 {
		log.Printf("Number of client connections reaches %d\n", newConnCnt)
	}

	// function arguments are always evaluated, so surround debug statement
	// with if statement
	ss.Debug.Printf("new client %s->%s\n", conn.RemoteAddr().String(), conn.LocalAddr())
	closed := false
	defer func() {
		ss.Debug.Printf("closed pipe %s<->%s\n", conn.RemoteAddr(), host)
		atomic.AddUint64(&connCnt, ^uint64(0)) // connCnt--
		if !closed {
			conn.Close()
		}
	}()

	h, p, extra, err := getRequest(conn)
	if err != nil {
		log.Println("error getting request", conn.RemoteAddr(), conn.LocalAddr(), err)
		return
	}
	host = h + ":" + p
	ss.Debug.Println("connecting", host)
	addr, err := net.ResolveIPAddr("ip", h)
	if err != nil {
		log.Println(err)
		return
	}
	ip := addr.String()
	if (strings.HasPrefix(ip, "127.") && (p != "1194" || openvpn != "ok")) ||
		strings.HasPrefix(ip, "10.8.") || ip == "::1" {
		log.Printf("illegal connect to local network(%s)\n", ip)
		return
	}
	remote, err := net.Dial("tcp", net.JoinHostPort(ip, p))
	if err != nil {
		if ne, ok := err.(*net.OpError); ok && (ne.Err == syscall.EMFILE || ne.Err == syscall.ENFILE) {
			// log too many open file error
			// EMFILE is process reaches open file limits, ENFILE is system limit
			log.Println("dial error:", err)
		} else {
			log.Println("error connecting to:", host, err)
		}
		return
	}
	defer func() {
		if !closed {
			remote.Close()
		}
	}()
	// write extra bytes read from
	if extra != nil {
		// Debug.Println("getRequest read extra data, writing to remote, len", len(extra))
		if _, err = remote.Write(extra); err != nil {
			ss.Debug.Println("write request extra error:", err)
			return
		}
	}
	ss.Debug.Printf("ping %s<->%s", conn.RemoteAddr(), host)
	go ss.PipeThenClose(conn, remote, ss.SET_TIMEOUT, pflag, port, "out")
	ss.PipeThenClose(remote, conn, ss.NO_TIMEOUT, pflag, port, "in")
	closed = true
	return
}