这段代码用来转发shadowbane的封包，用来作为一个代理，保存封包信息，方便对此进行协议分析-Simple SBProxyServer using select. evilight at gmail dot com this code will act as a proxy server for shadowbane client so you can get all pockets to analyze shadowbane login protocol

用状态机来写一个socks5代理服务器，为了移植性和很多新手都在用windows，异步驱动我就只用select而没用epoll。-I have written a Proxy Socks5 server by using finite-state machine. Because of the so many people are studying under Windows, I just implement it by select not by epoll.