TCP port tunnel server

tun.js

const net = require('net')

const local = { host: '0.0.0.0', port: 12000 }
const remote = { host: '127.0.0.1', port: 8080 }

net
.createServer({ allowHalfOpen: true })
.listen(local)
.on('connection', socket => {
	const proxySocket = net.connect(remote.port, remote.host)
	.on('data', data => socket.write(data))
	.on('error', () => proxySocket.end())
	socket
	.on('data', data => proxySocket.write(data))
	.on('error', () => socket.end())
})