const net = require("net");
process.on("uncaughtException", function (error) { console.error(error);});
if (process.argv.length != 4) { console.log("usage: %s <localport> <remoteport>", process.argv[1]); process.exit();}
const localport = process.argv[2];const remoteport = process.argv[3];
const remotehost = "127.0.0.1";
const server = net.createServer(function (localsocket) { const remotesocket = new net.Socket();
remotesocket.connect(remoteport, remotehost);
localsocket.on("data", function (data) { const flushed = remotesocket.write(data); if (!flushed) { localsocket.pause(); } });
remotesocket.on("data", function (data) { const flushed = localsocket.write(data); if (!flushed) { remotesocket.pause(); } });
localsocket.on("drain", function () { remotesocket.resume(); });
remotesocket.on("drain", function () { localsocket.resume(); });
localsocket.on("close", function () { remotesocket.end(); });
remotesocket.on("close", function () { localsocket.end(); });
localsocket.on("error", function () { localsocket.end(); });
remotesocket.on("error", function () { remotesocket.end(); });});
server.listen(localport);
console.log( "redirecting connections from 127.0.0.1:%d to %s:%d", localport, remotehost, remoteport,);