使用node.js快速开发透明代理

   
var net = require('net');    
var proxyhost="127.0.0.1";//被代理的服务的IP    
var proxyport=3306;//被代理的端口    
var listenport=8124;//代理端口    
net.createServer(function (socket) {    
   socket.on("connect",function(){    
        console.log('connected');    
        try{    
            var db=net.createConnection(proxyport,proxyhost);    
            db.on("connect",function(){    
                console.log("server connected");    
                socket.on("data", function (data) {    
                    db.write(data);    
                  });    
                db.on("data",function(data){    
                    console.log(data.toString('utf8',0,data.legnth));    
                    //console.log(data);    
                    socket.write(data);    
                });    
                socket.on("close",function(){    
                    console.log("server closed");    
                    db.destroy();    
                });    
            });    
           db.on("error",function(data){    
                console.log("error:\r\n"+data);    
            });    
            db.on("end",function(){    
                console.log("server closed");    
                socket.destroy();    
            });    
        }catch(err){    
             console.log(err);                        
        }    
    });    
}).listen(listenport, "0.0.0.0");    
   
//来自    http://www.cnblogs.com/sunli/，用于测试，生产环境需考虑稳定性代码处理