Forward TCP to UDP

tcp2udp.js

#!/usr/bin/env node
const net = require('net');
const dgram = require('dgram');

if (process.argv.length !== 4) {
  console.error(`
Usage: 
  node tcp2udp.js <TCP_SRC_PORT> <UDP_DST_PORT>
  `);
  process.exit(-1);
}

// Get ports
const pIn = process.argv[2] | 0;
const pOut = process.argv[3] | 0;

// Create UDP Client
const client = dgram.createSocket('udp4');

// Create TCP Server
const tcpServer = net.createServer(socket => {
  socket.on('data', (d) => {
    client.send(d, pOut);
  });
});

// Bind
tcpServer.listen(pIn);