frp/vendor/github.com/fatedier/golib/net/proxy.go

108 lines
2.5 KiB
Go

// Copyright 2018 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"
"golang.org/x/net/proxy"
)
type ProxyAuth struct {
Enable bool
Username string
Passwd string
}
func DialTcpByProxy(proxyStr string, addr string) (c net.Conn, err error) {
if proxyStr == "" {
return net.Dial("tcp", addr)
}
var proxyUrl *url.URL
if proxyUrl, err = url.Parse(proxyStr); err != nil {
return
}
auth := &ProxyAuth{}
if proxyUrl.User != nil {
auth.Enable = true
auth.Username = proxyUrl.User.Username()
auth.Passwd, _ = proxyUrl.User.Password()
}
switch proxyUrl.Scheme {
case "http":
return DialTcpByHttpProxy(proxyUrl.Host, addr, auth)
case "socks5":
return DialTcpBySocks5Proxy(proxyUrl.Host, addr, auth)
default:
err = fmt.Errorf("Proxy URL scheme must be http or socks5, not [%s]", proxyUrl.Scheme)
return
}
}
func DialTcpByHttpProxy(proxyHost string, dstAddr string, auth *ProxyAuth) (c net.Conn, err error) {
if c, err = net.Dial("tcp", proxyHost); err != nil {
return
}
req, err := http.NewRequest("CONNECT", "http://"+dstAddr, nil)
if err != nil {
return
}
if auth.Enable {
req.Header.Set("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(auth.Username+":"+auth.Passwd)))
}
req.Header.Set("User-Agent", "Mozilla/5.0")
req.Write(c)
resp, err := http.ReadResponse(bufio.NewReader(c), req)
if err != nil {
return nil, err
}
resp.Body.Close()
if resp.StatusCode != 200 {
err = fmt.Errorf("DialTcpByHttpProxy error, StatusCode [%d]", resp.StatusCode)
return
}
return
}
func DialTcpBySocks5Proxy(proxyHost string, dstAddr string, auth *ProxyAuth) (c net.Conn, err error) {
var s5Auth *proxy.Auth
if auth.Enable {
s5Auth = &proxy.Auth{
User: auth.Username,
Password: auth.Passwd,
}
}
dialer, err := proxy.SOCKS5("tcp", proxyHost, s5Auth, nil)
if err != nil {
return nil, err
}
if c, err = dialer.Dial("tcp", dstAddr); err != nil {
return
}
return
}