frp/utils/net/tcp.go

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2017-03-09 02:03:47 +08:00
// 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.
package net
import (
"bufio"
"encoding/base64"
"fmt"
"net"
"net/http"
"net/url"
"github.com/fatedier/frp/utils/log"
)
type TcpListener struct {
net.Addr
listener net.Listener
accept chan Conn
closeFlag bool
}
func ListenTcp(bindAddr string, bindPort int64) (l *TcpListener, err error) {
tcpAddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%d", bindAddr, bindPort))
if err != nil {
return l, err
}
listener, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
return l, err
}
l = &TcpListener{
Addr: listener.Addr(),
listener: listener,
accept: make(chan Conn),
closeFlag: false,
}
go func() {
for {
conn, err := listener.AcceptTCP()
if err != nil {
if l.closeFlag {
close(l.accept)
return
}
continue
}
c := NewTcpConn(conn)
l.accept <- c
}
}()
return l, err
}
// Wait util get one new connection or listener is closed
// if listener is closed, err returned.
func (l *TcpListener) Accept() (Conn, error) {
conn, ok := <-l.accept
if !ok {
return conn, fmt.Errorf("channel for tcp listener closed")
}
return conn, nil
}
func (l *TcpListener) Close() error {
if !l.closeFlag {
l.closeFlag = true
l.listener.Close()
}
return nil
}
// Wrap for TCPConn.
type TcpConn struct {
net.Conn
log.Logger
}
func NewTcpConn(conn *net.TCPConn) (c *TcpConn) {
c = &TcpConn{
Conn: conn,
Logger: log.NewPrefixLogger(""),
}
return
}
func ConnectTcpServer(addr string) (c Conn, err error) {
servertAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return
}
conn, err := net.DialTCP("tcp", nil, servertAddr)
if err != nil {
return
}
c = NewTcpConn(conn)
return
}
// ConnectTcpServerByHttpProxy try to connect remote server by http proxy.
// If httpProxy is empty, it will connect server directly.
func ConnectTcpServerByHttpProxy(httpProxy string, serverAddr string) (c Conn, err error) {
if httpProxy == "" {
return ConnectTcpServer(serverAddr)
}
var proxyUrl *url.URL
if proxyUrl, err = url.Parse(httpProxy); err != nil {
return
}
var proxyAuth string
if proxyUrl.User != nil {
proxyAuth = "Basic " + base64.StdEncoding.EncodeToString([]byte(proxyUrl.User.String()))
}
if proxyUrl.Scheme != "http" {
err = fmt.Errorf("Proxy URL scheme must be http, not [%s]", proxyUrl.Scheme)
return
}
if c, err = ConnectTcpServer(proxyUrl.Host); err != nil {
return
}
req, err := http.NewRequest("CONNECT", "http://"+serverAddr, nil)
if err != nil {
return
}
if proxyAuth != "" {
req.Header.Set("Proxy-Authorization", proxyAuth)
}
req.Header.Set("User-Agent", "Mozilla/5.0")
req.Write(c)
resp, err := http.ReadResponse(bufio.NewReader(c), req)
if err != nil {
return
}
resp.Body.Close()
if resp.StatusCode != 200 {
err = fmt.Errorf("ConnectTcpServer using proxy error, StatusCode [%d]", resp.StatusCode)
return
}
return
}