mirror of
https://github.com/fatedier/frp.git
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217 lines
4.9 KiB
Go
217 lines
4.9 KiB
Go
// Copyright 2016 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package net
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"net"
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"sync"
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"sync/atomic"
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"time"
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"github.com/fatedier/frp/utils/log"
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kcp "github.com/fatedier/kcp-go"
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)
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// Conn is the interface of connections used in frp.
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type Conn interface {
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net.Conn
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log.Logger
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}
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type WrapLogConn struct {
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net.Conn
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log.Logger
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}
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func WrapConn(c net.Conn) Conn {
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return &WrapLogConn{
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Conn: c,
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Logger: log.NewPrefixLogger(""),
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}
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}
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type WrapReadWriteCloserConn struct {
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io.ReadWriteCloser
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log.Logger
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underConn net.Conn
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}
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func WrapReadWriteCloserToConn(rwc io.ReadWriteCloser, underConn net.Conn) Conn {
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return &WrapReadWriteCloserConn{
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ReadWriteCloser: rwc,
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Logger: log.NewPrefixLogger(""),
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underConn: underConn,
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}
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}
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func (conn *WrapReadWriteCloserConn) LocalAddr() net.Addr {
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if conn.underConn != nil {
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return conn.underConn.LocalAddr()
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}
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return (*net.TCPAddr)(nil)
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}
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func (conn *WrapReadWriteCloserConn) RemoteAddr() net.Addr {
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if conn.underConn != nil {
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return conn.underConn.RemoteAddr()
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}
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return (*net.TCPAddr)(nil)
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}
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func (conn *WrapReadWriteCloserConn) SetDeadline(t time.Time) error {
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if conn.underConn != nil {
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return conn.underConn.SetDeadline(t)
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}
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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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func (conn *WrapReadWriteCloserConn) SetReadDeadline(t time.Time) error {
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if conn.underConn != nil {
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return conn.underConn.SetReadDeadline(t)
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}
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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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func (conn *WrapReadWriteCloserConn) SetWriteDeadline(t time.Time) error {
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if conn.underConn != nil {
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return conn.underConn.SetWriteDeadline(t)
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}
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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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func ConnectServer(protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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return ConnectTcpServer(addr)
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case "kcp":
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kcpConn, errRet := kcp.DialWithOptions(addr, nil, 10, 3)
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if errRet != nil {
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err = errRet
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return
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}
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kcpConn.SetStreamMode(true)
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kcpConn.SetWriteDelay(true)
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kcpConn.SetNoDelay(1, 20, 2, 1)
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kcpConn.SetWindowSize(128, 512)
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kcpConn.SetMtu(1350)
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kcpConn.SetACKNoDelay(false)
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kcpConn.SetReadBuffer(4194304)
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kcpConn.SetWriteBuffer(4194304)
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c = WrapConn(kcpConn)
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return
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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}
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}
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func ConnectServerByHttpProxy(httpProxy string, protocol string, addr string) (c Conn, err error) {
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switch protocol {
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case "tcp":
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return ConnectTcpServerByHttpProxy(httpProxy, addr)
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case "kcp":
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// http proxy is not supported for kcp
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return ConnectServer(protocol, addr)
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default:
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return nil, fmt.Errorf("unsupport protocol: %s", protocol)
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}
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}
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type SharedConn struct {
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Conn
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sync.Mutex
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buf *bytes.Buffer
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}
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// the bytes you read in io.Reader, will be reserved in SharedConn
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func NewShareConn(conn Conn) (*SharedConn, io.Reader) {
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sc := &SharedConn{
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Conn: conn,
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buf: bytes.NewBuffer(make([]byte, 0, 1024)),
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}
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return sc, io.TeeReader(conn, sc.buf)
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}
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func (sc *SharedConn) Read(p []byte) (n int, err error) {
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sc.Lock()
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if sc.buf == nil {
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sc.Unlock()
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return sc.Conn.Read(p)
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}
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sc.Unlock()
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n, err = sc.buf.Read(p)
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if err == io.EOF {
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sc.Lock()
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sc.buf = nil
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sc.Unlock()
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var n2 int
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n2, err = sc.Conn.Read(p[n:])
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n += n2
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}
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return
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}
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func (sc *SharedConn) WriteBuff(buffer []byte) (err error) {
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sc.buf.Reset()
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_, err = sc.buf.Write(buffer)
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return err
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}
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type StatsConn struct {
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Conn
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closed int64 // 1 means closed
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totalRead int64
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totalWrite int64
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statsFunc func(totalRead, totalWrite int64)
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}
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func WrapStatsConn(conn Conn, statsFunc func(total, totalWrite int64)) *StatsConn {
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return &StatsConn{
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Conn: conn,
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statsFunc: statsFunc,
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}
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}
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func (statsConn *StatsConn) Read(p []byte) (n int, err error) {
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n, err = statsConn.Conn.Read(p)
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statsConn.totalRead += int64(n)
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return
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}
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func (statsConn *StatsConn) Write(p []byte) (n int, err error) {
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n, err = statsConn.Conn.Write(p)
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statsConn.totalWrite += int64(n)
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return
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}
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func (statsConn *StatsConn) Close() (err error) {
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old := atomic.SwapInt64(&statsConn.closed, 1)
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if old != 1 {
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err = statsConn.Conn.Close()
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if statsConn.statsFunc != nil {
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statsConn.statsFunc(statsConn.totalRead, statsConn.totalWrite)
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}
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}
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return
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}
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