HTTP proxy to SOCKS 5 proxy relay

Single-purpose HTTP proxy relaying requests to an existing (external) SOCKS 5 proxy server. This tool is useful in the case where the SOCKS proxy is the only proxy available, but the application that you wish to use does not support SOCKS. This little program is a welcome addition to SSH's capability of setting up a SOCKS proxy server.

Please note: This implementation is specifically limited to this use case only. Other use cases may be trivial to create, however they are not part of this implementation.

Usage

./relay -listen :8080 -socks localhost:8000 -block "127.0.0.1,localhost,192.168/16"

Start a HTTP relay proxy that listens on port 8080 of every interface and connects to a SOCKS proxy server on localhost port 8000 for relaying your requests. Block requests that attempt to access 127.0.0.1, 'localhost' or any address in the ip range 192.168.0.0-192.168.255.255.

./proxy -listen localhost:8080 -block "127.0.0.1,localhost,192.168/16"

Start a (tiny) generic HTTP proxy server that listens on port 8080 of 'localhost' and proxies requests directly to the internet. Block any requests to 127.0.0.1, 'localhost' or any address in the ip range 192.168.0.0-192.168.255.255.

Program arguments

The program arguments that are available to both programs.

• -block provide any number of network addresses/ranges to protect from access through the proxy/relay.
• -blocklist specify a hosts-formatted blocklist to be loaded and used.
• -listen specify the address and port on which to listen for incoming proxy connections.

The following program arguments are applicable to relay only.

• -socks the SOCKS proxy to which to forward http proxy requests.

Building

The simplest way to build is: make.

This build will use the build flag -tags netgo to make the result independent of gcc. Refer to Makefile for details.

Changelog

• 2020-02-04 Added support for loading in blocklists that are checked as part of the proxying process.
  The program argument -blocklist <filename> allows loading hostname blocklists formatted as the OS hosts file. Blocklists in these formats can be downloaded from various places, such as NoTracking and EnergizedPro.
• 2019-12-22 Added support for Go modules.
• way back Support for http proxy/relay, with -block parameter to protect local network and/or specific addresses/networks from being accessed.

References

• Go extension library for proxy connections
• What proxies must do
• NoTracking blocklist
• EnergizedPro