chenshuo/muduo — pull request #101 by weizili (2014-11-23 02:49:14+00:00)
Title: Add ip and port to the server response data

Server to SOCKS4a client:

* field 1: null byte
* field 2: status, 1 byte:

* 0x5a = request granted
* 0x5b = request rejected or failed
* 0x5c = request failed because client is not running identd (or not reachable from the server)
* 0x5d = request failed because client's identd could not confirm the user ID string in the request

* field 3: network byte order port number, 2 bytes
* field 4: network byte order IP address, 4 bytes