move dial functions into golib (#2767)

pkg/util/net/conn.go

@@ -17,18 +17,12 @@ package net
 import (
 	"context"
 	"errors"
-	"fmt"
 	"io"
 	"net"
-	"net/url"
 	"sync/atomic"
 	"time"
 
 	"github.com/fatedier/frp/pkg/util/xlog"
-	"golang.org/x/net/websocket"
-
-	gnet "github.com/fatedier/golib/net"
-	kcp "github.com/fatedier/kcp-go"
 )
 
 type ContextGetter interface {
@@ -189,67 +183,3 @@ func (statsConn *StatsConn) Close() (err error) {
 	}
 	return
 }
-
-func ConnectServer(protocol string, addr string) (c net.Conn, err error) {
-	switch protocol {
-	case "tcp":
-		return net.Dial("tcp", addr)
-	case "kcp":
-		return DialKCPServer(addr)
-	case "websocket":
-		return DialWebsocketServer(addr)
-	default:
-		return nil, fmt.Errorf("unsupport protocol: %s", protocol)
-	}
-}
-
-func DialKCPServer(addr string) (c net.Conn, err error) {
-	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 = kcpConn
-	return
-}
-
-func ConnectServerByProxy(proxyURL string, protocol string, addr string) (c net.Conn, err error) {
-	switch protocol {
-	case "tcp":
-		return gnet.DialTcpByProxy(proxyURL, addr)
-	default:
-		return nil, fmt.Errorf("unsupport protocol: %s when connecting by proxy", protocol)
-	}
-}
-
-// addr: domain:port
-func DialWebsocketServer(addr string) (net.Conn, error) {
-	addr = "ws://" + addr + FrpWebsocketPath
-	uri, err := url.Parse(addr)
-	if err != nil {
-		return nil, err
-	}
-
-	origin := "http://" + uri.Host
-	cfg, err := websocket.NewConfig(addr, origin)
-	if err != nil {
-		return nil, err
-	}
-	cfg.Dialer = &net.Dialer{
-		Timeout: 10 * time.Second,
-	}
-
-	conn, err := websocket.DialConfig(cfg)
-	if err != nil {
-		return nil, err
-	}
-	return conn, nil
-}