基于node.js的快速开发透明代理

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");
//用于测试，生产环境需考虑稳定性代码处理