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)
+	}
+}