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| require 'rubygems' | |
| require 'eventmachine' | |
| module ProxyConnection | |
| def initialize(client) | |
| @client = client | |
| end | |
| def post_init | |
| proxy_incoming_to(@client) | |
| end | |
| def proxy_target_unbound | |
| close_connection | |
| end | |
| def unbind | |
| @client.close_connection_after_writing | |
| end | |
| end | |
| module ProxyServer | |
| def receive_data(data) | |
| (@buf ||= "") << data | |
| return if @buf.size < 9 | |
| null_index = @buf[8..-1].index("\0") | |
| return if null_index.nil? | |
| header_request = @buf.slice! 0, 9 + null_index | |
| version, cmd, port, host = header_request.unpack("CCnA4") | |
| if version != 4 || cmd != 1 | |
| send_data [0, 0x5b, 0, 0, 0, 0, 0, 0].pack("C8") | |
| close_connection_after_writing | |
| else | |
| send_data [0, 0x5a, 0, 0, 0, 0, 0, 0].pack("C8") | |
| host = host.unpack("C*").join(".") | |
| client = EM.connect host, port, ProxyConnection, self | |
| client.send_data(@buf) | |
| proxy_incoming_to(client) | |
| end | |
| end | |
| end | |
| EventMachine::run { | |
| EventMachine::start_server "127.0.0.1", 1080, ProxyServer | |
| puts "running proxy" | |
| } | |
| __END__ | |
| $ curl --socks4 127.0.0.1:1080 http://google.com/ | |
| <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> | |
| <TITLE>301 Moved</TITLE></HEAD><BODY> | |
| <H1>301 Moved</H1> | |
| The document has moved | |
| <A HREF="http://www.google.com/">here</A>. | |
| </BODY></HTML> |
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