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// Copyright 2012, Hailiang Wang. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
/*
Package socks implements a SOCKS (SOCKS4, SOCKS4A and SOCKS5) proxy client.
A complete example using this package:
package main
import (
"h12.io/socks"
"fmt"
"net/http"
"io/ioutil"
)
func main() {
dialSocksProxy := socks.Dial("socks5://127.0.0.1:1080?timeout=5s")
tr := &http.Transport{Dial: dialSocksProxy}
httpClient := &http.Client{Transport: tr}
bodyText, err := TestHttpsGet(httpClient, "https://h12.io/about")
if err != nil {
fmt.Println(err.Error())
}
fmt.Print(bodyText)
}
func TestHttpsGet(c *http.Client, url string) (bodyText string, err error) {
resp, err := c.Get(url)
if err != nil { return }
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil { return }
bodyText = string(body)
return
}
*/
package socks // import "h12.io/socks"
import (
"fmt"
"net"
)
// Constants to choose which version of SOCKS protocol to use.
const (
SOCKS4 = iota
SOCKS4A
SOCKS5
)
// Dial returns the dial function to be used in http.Transport object.
// Argument proxyURI should be in the format: "socks5://user:password@127.0.0.1:1080?timeout=5s".
// The protocol could be socks5, socks4 and socks4a.
func Dial(proxyURI string) func(string, string) (net.Conn, error) {
cfg, err := parse(proxyURI)
if err != nil {
return dialError(err)
}
return cfg.dialFunc()
}
// DialSocksProxy returns the dial function to be used in http.Transport object.
// Argument socksType should be one of SOCKS4, SOCKS4A and SOCKS5.
// Argument proxy should be in this format "127.0.0.1:1080".
func DialSocksProxy(socksType int, proxy string) func(string, string) (net.Conn, error) {
return (&config{Proto: socksType, Host: proxy}).dialFunc()
}
func (c *config) dialFunc() func(string, string) (net.Conn, error) {
switch c.Proto {
case SOCKS5:
return func(_, targetAddr string) (conn net.Conn, err error) {
return c.dialSocks5(targetAddr)
}
case SOCKS4, SOCKS4A:
return func(_, targetAddr string) (conn net.Conn, err error) {
return c.dialSocks4(targetAddr)
}
}
return dialError(fmt.Errorf("unknown SOCKS protocol %v", c.Proto))
}
func dialError(err error) func(string, string) (net.Conn, error) {
return func(_, _ string) (net.Conn, error) {
return nil, err
}
}
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