support protocol kcp

utils/net/conn.go

@@ -15,11 +15,14 @@
 package net
 
 import (
+	"fmt"
 	"io"
 	"net"
 	"time"
 
 	"github.com/fatedier/frp/utils/log"
+
+	kcp "github.com/xtaci/kcp-go"
 )
 
 // Conn is the interface of connections used in frp.
@@ -77,3 +80,59 @@ type Listener interface {
 	Close() error
 	log.Logger
 }
+
+type LogListener struct {
+	l net.Listener
+	net.Listener
+	log.Logger
+}
+
+func WrapLogListener(l net.Listener) Listener {
+	return &LogListener{
+		l:        l,
+		Listener: l,
+		Logger:   log.NewPrefixLogger(""),
+	}
+}
+
+func (logL *LogListener) Accept() (Conn, error) {
+	c, err := logL.l.Accept()
+	return WrapConn(c), err
+}
+
+func ConnectServer(protocol string, addr string) (c Conn, err error) {
+	switch protocol {
+	case "tcp":
+		return ConnectTcpServer(addr)
+	case "kcp":
+		kcpConn, errRet := kcp.DialWithOptions(addr, nil, 10, 3)
+		if errRet != nil {
+			err = errRet
+			return
+		}
+		kcpConn.SetStreamMode(true)
+		kcpConn.SetWriteDelay(true)
+		kcpConn.SetNoDelay(1, 20, 2, 1)
+		kcpConn.SetWindowSize(128, 512)
+		kcpConn.SetMtu(1350)
+		kcpConn.SetACKNoDelay(false)
+		kcpConn.SetReadBuffer(4194304)
+		kcpConn.SetWriteBuffer(4194304)
+		c = WrapConn(kcpConn)
+		return
+	default:
+		return nil, fmt.Errorf("unsupport protocol: %s", protocol)
+	}
+}
+
+func ConnectServerByHttpProxy(httpProxy string, protocol string, addr string) (c Conn, err error) {
+	switch protocol {
+	case "tcp":
+		return ConnectTcpServerByHttpProxy(httpProxy, addr)
+	case "kcp":
+		// http proxy is not supported for kcp
+		return ConnectServer(protocol, addr)
+	default:
+		return nil, fmt.Errorf("unsupport protocol: %s", protocol)
+	}
+}

utils/net/kcp.go

@@ -0,0 +1,87 @@
+// Copyright 2017 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package net
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/fatedier/frp/utils/log"
+
+	kcp "github.com/xtaci/kcp-go"
+)
+
+type KcpListener struct {
+	net.Addr
+	listener  net.Listener
+	accept    chan Conn
+	closeFlag bool
+	log.Logger
+}
+
+func ListenKcp(bindAddr string, bindPort int64) (l *KcpListener, err error) {
+	listener, err := kcp.ListenWithOptions(fmt.Sprintf("%s:%d", bindAddr, bindPort), nil, 10, 3)
+	if err != nil {
+		return l, err
+	}
+	listener.SetReadBuffer(4194304)
+	listener.SetWriteBuffer(4194304)
+
+	l = &KcpListener{
+		Addr:      listener.Addr(),
+		listener:  listener,
+		accept:    make(chan Conn),
+		closeFlag: false,
+		Logger:    log.NewPrefixLogger(""),
+	}
+
+	go func() {
+		for {
+			conn, err := listener.AcceptKCP()
+			if err != nil {
+				if l.closeFlag {
+					close(l.accept)
+					return
+				}
+				continue
+			}
+			conn.SetStreamMode(true)
+			conn.SetWriteDelay(true)
+			conn.SetNoDelay(1, 20, 2, 1)
+			conn.SetMtu(1350)
+			conn.SetWindowSize(1024, 1024)
+			conn.SetACKNoDelay(false)
+
+			l.accept <- WrapConn(conn)
+		}
+	}()
+	return l, err
+}
+
+func (l *KcpListener) Accept() (Conn, error) {
+	conn, ok := <-l.accept
+	if !ok {
+		return conn, fmt.Errorf("channel for kcp listener closed")
+	}
+	return conn, nil
+}
+
+func (l *KcpListener) Close() error {
+	if !l.closeFlag {
+		l.closeFlag = true
+		l.listener.Close()
+	}
+	return nil
+}