frp/utils/net/conn.go

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// Copyright 2016 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.
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package net
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import (
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"net"
"sync/atomic"
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"time"
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"github.com/fatedier/frp/utils/log"
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gnet "github.com/fatedier/golib/net"
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kcp "github.com/fatedier/kcp-go"
)
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// Conn is the interface of connections used in frp.
type Conn interface {
net.Conn
log.Logger
}
type WrapLogConn struct {
net.Conn
log.Logger
}
func WrapConn(c net.Conn) Conn {
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return &WrapLogConn{
Conn: c,
Logger: log.NewPrefixLogger(""),
}
}
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type WrapReadWriteCloserConn struct {
io.ReadWriteCloser
log.Logger
underConn net.Conn
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}
func WrapReadWriteCloserToConn(rwc io.ReadWriteCloser, underConn net.Conn) Conn {
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return &WrapReadWriteCloserConn{
ReadWriteCloser: rwc,
Logger: log.NewPrefixLogger(""),
underConn: underConn,
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}
}
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func (conn *WrapReadWriteCloserConn) LocalAddr() net.Addr {
if conn.underConn != nil {
return conn.underConn.LocalAddr()
}
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return (*net.TCPAddr)(nil)
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}
func (conn *WrapReadWriteCloserConn) RemoteAddr() net.Addr {
if conn.underConn != nil {
return conn.underConn.RemoteAddr()
}
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return (*net.TCPAddr)(nil)
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}
func (conn *WrapReadWriteCloserConn) SetDeadline(t time.Time) error {
if conn.underConn != nil {
return conn.underConn.SetDeadline(t)
}
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return &net.OpError{Op: "set", Net: "wrap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
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}
func (conn *WrapReadWriteCloserConn) SetReadDeadline(t time.Time) error {
if conn.underConn != nil {
return conn.underConn.SetReadDeadline(t)
}
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return &net.OpError{Op: "set", Net: "wrap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
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}
func (conn *WrapReadWriteCloserConn) SetWriteDeadline(t time.Time) error {
if conn.underConn != nil {
return conn.underConn.SetWriteDeadline(t)
}
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return &net.OpError{Op: "set", Net: "wrap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
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}
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type CloseNotifyConn struct {
net.Conn
log.Logger
// 1 means closed
closeFlag int32
closeFn func()
}
// closeFn will be only called once
func WrapCloseNotifyConn(c net.Conn, closeFn func()) Conn {
return &CloseNotifyConn{
Conn: c,
Logger: log.NewPrefixLogger(""),
closeFn: closeFn,
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}
}
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func (cc *CloseNotifyConn) Close() (err error) {
pflag := atomic.SwapInt32(&cc.closeFlag, 1)
if pflag == 0 {
err = cc.Close()
if cc.closeFn != nil {
cc.closeFn()
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}
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}
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return
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}
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type StatsConn struct {
Conn
closed int64 // 1 means closed
totalRead int64
totalWrite int64
statsFunc func(totalRead, totalWrite int64)
}
func WrapStatsConn(conn Conn, statsFunc func(total, totalWrite int64)) *StatsConn {
return &StatsConn{
Conn: conn,
statsFunc: statsFunc,
}
}
func (statsConn *StatsConn) Read(p []byte) (n int, err error) {
n, err = statsConn.Conn.Read(p)
statsConn.totalRead += int64(n)
return
}
func (statsConn *StatsConn) Write(p []byte) (n int, err error) {
n, err = statsConn.Conn.Write(p)
statsConn.totalWrite += int64(n)
return
}
func (statsConn *StatsConn) Close() (err error) {
old := atomic.SwapInt64(&statsConn.closed, 1)
if old != 1 {
err = statsConn.Conn.Close()
if statsConn.statsFunc != nil {
statsConn.statsFunc(statsConn.totalRead, statsConn.totalWrite)
}
}
return
}
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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 ConnectServerByProxy(proxyUrl string, protocol string, addr string) (c Conn, err error) {
switch protocol {
case "tcp":
var conn net.Conn
if conn, err = gnet.DialTcpByProxy(proxyUrl, addr); err != nil {
return
}
return WrapConn(conn), nil
case "kcp":
// http proxy is not supported for kcp
return ConnectServer(protocol, addr)
case "websocket":
return ConnectWebsocketServer(addr)
default:
return nil, fmt.Errorf("unsupport protocol: %s", protocol)
}
}
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func ConnectServerByProxyWithTLS(proxyUrl string, protocol string, addr string, tlsConfig *tls.Config) (c Conn, err error) {
c, err = ConnectServerByProxy(proxyUrl, protocol, addr)
if tlsConfig == nil {
return
}
c = WrapTLSClientConn(c, tlsConfig)
return
}