em-socksify

Transparent proxy support for any EventMachine protocol

Dealing with SOCKS and HTTP proxies is a pain. EM-Socksify provides a simple ship to setup and negotiation a SOCKS / HTTP connection for any EventMachine protocol.

Example: Routing HTTP request via SOCKS5 proxy

class Handler < EM::Connection
  include EM::Socksify

  def connection_completed
    socksify('google.ca', 80) do
      send_data "GET / HTTP/1.1\r\nConnection:close\r\nHost: google.ca\r\n\r\n"
    end
  end

  def receive_data(data)
    p data
  end
end

EM.run do
  EventMachine.connect SOCKS_HOST, SOCKS_PORT, Handler
end

What's happening here? First, we open a raw TCP connection to the SOCKS proxy. Once the TCP connection is established, EventMachine calls the connection_completed method in our handler, at which point we call the helper method (socksify) with the actual destination and host and port (address that we actually want to get to), and the module does the rest.

socksify temporarily intercepts your receive_data callbacks, negotiates the SOCKS connection (version, authentication, etc), and then once all of that is done, returns control back to your code.

For SOCKS proxies which require authentication, use:

socksify(destination_host, destination_port, username, password, version)

Example: Routing HTTPS request via a squid CONNECT proxy

class Handler < EM::Connection
  include EM::Connectify

  def connection_completed
    connectify('www.google.ca', 443) do
      start_tls
      send_data "GET / HTTP/1.1\r\nConnection:close\r\nHost: www.google.ca\r\n\r\n"
    end
  end

  def receive_data(data)
    p data
  end
end

EM.run do
  EventMachine.connect PROXY_HOST, PROXY_PORT, Handler
end

For CONNECT proxies which require authentication, use:

connectify(destination_host, destination_port, username, password)

Wishlist

• IPV6 support
• SOCKS4 support

Resources

• SOCKS on Wikipedia
• Socksify-Ruby for regular Ruby TCPSocket
• HTTP Connect Tunneling

Contributors

• Ilya Grigorik
• Conrad Irwin

License

(The MIT License)