add tcp port forwarding

conn.go

@@ -46,28 +46,22 @@ func listenAndServe(arg Args) error {
 
 	switch arg.Transport {
 	case "ws": // websocket connection
-		err = NewWs(arg).ListenAndServe()
-		if err != nil {
-			glog.Infoln(err)
-		}
-		return err
+		return NewWs(arg).ListenAndServe()
 	case "wss": // websocket security connection
-		err = NewWs(arg).listenAndServeTLS()
-		if err != nil {
-			glog.Infoln(err)
-		}
-		return err
+		return NewWs(arg).listenAndServeTLS()
 	case "tls": // tls connection
 		ln, err = tls.Listen("tcp", arg.Addr,
 			&tls.Config{Certificates: []tls.Certificate{arg.Cert}})
-	case "tcp":
-		fallthrough
+	case "tcp": // TCP port forwarding
+		return listenAndServeTcpForward(arg)
+	case "udp": // UDP port forwarding
+		//return listenAndServeUdpForward(arg)
+		return nil
 	default:
 		ln, err = net.Listen("tcp", arg.Addr)
 	}
 
 	if err != nil {
-		glog.Infoln(err)
 		return err
 	}
 
@@ -81,10 +75,47 @@ func listenAndServe(arg Args) error {
 		}
 		go handleConn(conn, arg)
 	}
+}
 
+func listenAndServeTcpForward(arg Args) error {
+	ln, err := net.Listen("tcp", arg.Addr)
+	if err != nil {
+		return err
+	}
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			glog.V(LWARNING).Infoln(err)
+			continue
+		}
+		go handleTcpForward(conn, arg)
+	}
 	return nil
 }
 
+/*
+func listenAndServeUdpForward(arg Args) error {
+	addr, err := net.ResolveUDPAddr("udp", arg.Addr)
+	if err != nil {
+		return err
+	}
+	ln, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		return err
+	}
+	for {
+		b := udpPool.Get().([]byte)
+		defer udpPool.Put(b)
+
+		_, c, err := ln.ReadFromUDP(b)
+		if err != nil {
+			glog.V(LWARNING).Infoln(err)
+			continue
+		}
+		handleUdpForward(c, arg)
+	}
+}
+*/
 func handleConn(conn net.Conn, arg Args) {
 	atomic.AddInt32(&connCounter, 1)
 	glog.V(LINFO).Infof("%s connected, connections: %d",
@@ -99,7 +130,7 @@ func handleConn(conn net.Conn, arg Args) {
 	defer atomic.AddInt32(&connCounter, -1)
 	defer conn.Close()
 
-	// server supported methods
+	// socks5 server supported methods
 	selector := &serverSelector{
 		methods: []uint8{
 			gosocks5.MethodNoAuth,
@@ -134,7 +165,7 @@ func handleConn(conn net.Conn, arg Args) {
 		return
 	}
 
-	// http + socks5
+	// http or socks5
 
 	//b := make([]byte, 16*1024)
 	b := tcpPool.Get().([]byte)
@@ -212,7 +243,7 @@ func Connect(addr string) (conn net.Conn, err error) {
 		addr += ":80"
 	}
 	if len(forwardArgs) == 0 {
-		return net.DialTimeout("tcp", addr, time.Second*30)
+		return net.DialTimeout("tcp", addr, time.Second*60)
 	}
 
 	var end Args

forward.go

+package main
+
+import (
+	"github.com/golang/glog"
+	"net"
+)
+
+func handleTcpForward(conn net.Conn, arg Args) {
+	glog.V(LINFO).Infoln("[tcp-forward] CONNECT", arg.Forward)
+	c, err := Connect(arg.Forward)
+	if err != nil {
+		glog.V(LWARNING).Infoln("[tcp-forward] CONNECT", arg.Forward, err)
+		return
+	}
+	defer c.Close()
+
+	glog.V(LINFO).Infoln("[tcp-forward] CONNECT", arg.Forward, "OK")
+	Transport(conn, c)
+}
+
+func handleUdpForward(conn *net.UDPConn, arg Args) {
+
+}

main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"github.com/golang/glog"
 	"os"
+	"runtime"
 	"sync"
 )
 
@@ -18,7 +19,7 @@ const (
 )
 
 const (
-	Version = "2.0"
+	Version = "2.1-dev"
 )
 
 var (
@@ -45,6 +46,7 @@ func main() {
 	}
 	if pv {
 		fmt.Fprintln(os.Stderr, "gost", Version)
+		fmt.Fprintln(os.Stderr, runtime.Version())
 		return
 	}
 
@@ -60,7 +62,7 @@ func main() {
 		wg.Add(1)
 		go func(arg Args) {
 			defer wg.Done()
-			listenAndServe(arg)
+			glog.V(LERROR).Infoln(listenAndServe(arg))
 		}(args)
 	}
 	wg.Wait()

tls.go

@@ -6,6 +6,8 @@ import (
 )
 
 const (
+
+	// This is the default cert file for convenience, providing your own cert is recommended.
 	rawCert = `-----BEGIN CERTIFICATE-----
 MIIC5jCCAdCgAwIBAgIBADALBgkqhkiG9w0BAQUwEjEQMA4GA1UEChMHQWNtZSBD
 bzAeFw0xNDAzMTcwNjIwNTFaFw0xNTAzMTcwNjIwNTFaMBIxEDAOBgNVBAoTB0Fj

util.go

@@ -23,8 +23,9 @@ func (ss *strSlice) Set(value string) error {
 // admin:123456@localhost:8080
 type Args struct {
 	Addr      string // host:port
-	Protocol  string // protocol: http&socks5/http/socks/socks5/ss, default is http&socks5
-	Transport string // transport: tcp/ws/tls, default is tcp(raw tcp)
+	Protocol  string // protocol: http/socks(5)/ss
+	Transport string // transport: ws(s)/tls/tcp/udp
+	Forward   string // forward address, used by tcp/udp port forwarding
 	User      *url.Userinfo
 	Cert      tls.Certificate // tls certificate
 }
@@ -35,14 +36,14 @@ func (args Args) String() string {
 		authUser = args.User.Username()
 		authPass, _ = args.User.Password()
 	}
-	return fmt.Sprintf("host: %s, protocol: %s, transport: %s, auth: %s:%s",
-		args.Addr, args.Protocol, args.Transport, authUser, authPass)
+	return fmt.Sprintf("host: %s, protocol: %s, transport: %s, forward: %s, auth: %s/%s",
+		args.Addr, args.Protocol, args.Transport, args.Forward, authUser, authPass)
 }
 
 func parseArgs(ss []string) (args []Args) {
 	for _, s := range ss {
 		if !strings.Contains(s, "://") {
-			s = "tcp://" + s
+			s = "auto://" + s
 		}
 		u, err := url.Parse(s)
 		if err != nil {
@@ -51,9 +52,10 @@ func parseArgs(ss []string) (args []Args) {
 		}
 
 		arg := Args{
-			Addr: u.Host,
-			User: u.User,
-			Cert: tlsCert,
+			Addr:    u.Host,
+			User:    u.User,
+			Cert:    tlsCert,
+			Forward: strings.Trim(u.EscapedPath(), "/"),
 		}
 
 		schemes := strings.Split(u.Scheme, "+")
@@ -69,12 +71,15 @@ func parseArgs(ss []string) (args []Args) {
 		switch arg.Protocol {
 		case "http", "socks", "socks5", "ss":
 		default:
-			arg.Protocol = "default"
+			arg.Protocol = ""
 		}
+
 		switch arg.Transport {
-		case "ws", "wss", "tls", "tcp":
+		case "ws", "wss", "tls":
+		case "tcp", "udp": // started from v2.1, tcp and udp are for port forwarding
+			arg.Protocol = ""
 		default:
-			arg.Transport = "tcp"
+			arg.Transport = ""
 		}
 
 		args = append(args, arg)
@@ -83,7 +88,7 @@ func parseArgs(ss []string) (args []Args) {
 	return
 }
 
-// based on io.Copy
+// Based on io.Copy, but the io.ErrShortWrite is ignored (mainly for websocket)
 func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
 	buf := make([]byte, 32*1024)