socks5-proxy

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Socks5 Proxy with Go Lang. support USER_ID/PASSWORD. able to bypass HTTPS(SNI) censorship

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SOCKS 5 Proxy with Go Lang
=====

Original Library was imported from http://github.com/oov/socks5

I just modified and build for personal use.

this code support configuration loading.

* IP mask must be CIDR format like "1.2.3.0/24". If you want allow all client, use CIDR as "0.0.0.0/0"
* If ID/PW is supplied, use that. or IP restrictions

Additional Feature
-----
* HTTPS(SNI) Censorship in korea avoid function.
    * you can check the code at "socks5/server.go"
    * Tested 2019-02-19 (SK Broadband, Korea)

* IPv6 Support
    * Some ISP only support IPv6 connection environment (Ex: Mobile phone tethering). and this proxy can support that.
    * tested OK. (2021-03-13 / SK telecomm, iPhone + Macbook Tethering, Korea)

* Can be run as Cascade/Upstream Proxy.
    * You can setup with Adguard or some program. and works well :)

Installation
============
* if you want to use with windows, use released binary.
* if you want to use with linux(x86_64), just execute these command in console.
```
wget https://github.com/ziozzang/socks5-proxy/releases/download/1.0/socks5-proxy && chmod +x socks5-proxy
wget https://github.com/ziozzang/socks5-proxy/releases/download/1.0/socks5-proxy.config.template 
```

or you can run with docker. :)

```

docker build -t socks5proxy .
docker run --rm -it -v `pwd`/socks5-proxy.config:/app/socks5-proxy.config --net=host socks5proxy

```

* don't forget to edit configuration.

Original socks5
======

Package socks5 implements a "SOCKS Protocol Version 5" server.

This server supports a subset of RFC 1928:

* auth methods: "NO AUTHENTICATION REQUIRED", "USERNAME/PASSWORD"
* commands: "CONNECT"
* address types: "IP V4 address", "DOMAINNAME", "IP V6 address"
(but tested "DOMAINNAME" only)

INSTALL
-------

```sh
go get -u github.com/oov/socks5
```

USAGE
-----

```go
package main

import (
	"github.com/oov/socks5"
	"log"
)

func main() {
	srv := socks5.New()
	srv.AuthUsernamePasswordCallback = func(c *socks5.Conn, username, password []byte) error {
		user := string(username)
		if user != "guest" {
			return socks5.ErrAuthenticationFailed
		}

log.Printf("Welcome %v!", user)
		c.Data = user
		return nil
	}
	srv.HandleConnectFunc(func(c *socks5.Conn, host string) (newHost string, err error) {
		if host == "example.com:80" {
			return host, socks5.ErrConnectionNotAllowedByRuleset
		}
		if user, ok := c.Data.(string); ok {
			log.Printf("%v connecting to %v", user, host)
		}
		return host, nil
	})
	srv.HandleCloseFunc(func(c *socks5.Conn) {
		if user, ok := c.Data.(string); ok {
			log.Printf("Goodbye %v!", user)
		}
	})

srv.ListenAndServe(":12345")
}
```

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