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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"bytes"
"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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"time"
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"github.com/fatedier/frp/utils/log"
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kcp "github.com/xtaci/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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}
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)
}
}
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type SharedConn struct {
Conn
sync.Mutex
buf *bytes.Buffer
}
// the bytes you read in io.Reader, will be reserved in SharedConn
func NewShareConn(conn Conn) (*SharedConn, io.Reader) {
sc := &SharedConn{
Conn: conn,
buf: bytes.NewBuffer(make([]byte, 0, 1024)),
}
return sc, io.TeeReader(conn, sc.buf)
}
func (sc *SharedConn) Read(p []byte) (n int, err error) {
sc.Lock()
if sc.buf == nil {
sc.Unlock()
return sc.Conn.Read(p)
}
sc.Unlock()
n, err = sc.buf.Read(p)
if err == io.EOF {
sc.Lock()
sc.buf = nil
sc.Unlock()
var n2 int
n2, err = sc.Conn.Read(p[n:])
n += n2
}
return
}
func (sc *SharedConn) WriteBuff(buffer []byte) (err error) {
sc.buf.Reset()
_, err = sc.buf.Write(buffer)
return err
}