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Monthly Downloads: 2
Programming language: Erlang
License: MIT License
Tags: Networking    

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README

tunnerl

Build Status

SOCKS4, SOCKS4a and SOCKS5 protocols implementation in Erlang/OTP.

Features

  • SOCKS: A protocol for TCP proxy across firewalls: socks4
    • connect command only
  • SOCKS 4A: A Simple Extension to SOCKS 4 Protocol: socks4a
  • SOCKS Protocol Version 5: RFC1928
    • connect command only
    • Username/Password Authentication for SOCKS V5 RFC1929
    • ATYPs: IPv4, IPv6 and domain

Using

  1. Add tunnerl to your list of dependencies in rebar.config:
{deps, [
    {tunnerl, "1.0.0"}
]}.
  1. Ensure tunnerl is started before your application:
{applications, [tunnerl]}.
  1. Configure it to use custom handler::
{tunnerl, [
    {protocols, [socks4, socks5]},
    {handler, myapp_handler},
    {acceptors, 10},
    {ip, {0, 0, 0, 0}},
    {port, 1080}
]}.
  1. Implement myapp_handler:
-module(myapp_handler).

%% This simple handler module accepts username authentication and
%% allows user with password "pass" do connect command.
%% Also, is accepts all connections on Socks4 for "root".

-export([auth_methods/0, 
         auth/1, 
         handle_command/1]).

auth_methods() -> [username].

auth(#{username := <<"user">>, 
       password := <<"pass">>}) -> 
    accept;
auth(_) -> rejected.

handle_command(#{protocol := socks4, 
                 command := connect,
                 username := <<"root">>}) ->
    accept;
handle_command(#{protocol := socks5, 
                 command := connect,
                 username := <<"user">>}) ->
    accept;
handle_command(_) -> 
    reject.

Testing

Build:

$ git clone https://github.com/surik/tunnerl.git
$ cd tunnerl
$ rebar3 compile

Run tunnerl with simple predefined configuration with socks4/socks5 and no authentication

$ rebar3 shell --name [email protected] --config tunnerl.config --apps tunnerl

There is a bunch of common tests which can be running:

$ rebar3 ct

Note that IPv6 tests might not been working on your local machine.