simple port2port mapping

proxy.js

const argv2o=a=>(a||process.argv||[]).reduce((r,e)=>((m=e.match(/^(\/|--?)([\w-]*)="?(.*)"?$/))&&(r[m[2]]=m[3]),r),{});
const argo = argv2o();
const net = require('net');

net.createServer(from=>{
	var to = net.createConnection({host:argo.to_host,port:argo.to_port});
	from.pipe(to).on('error',err=>console.log('from/to',err));
	to.pipe(from).on('error',err=>console.log('to/from',err));
}).on('error',err=>console.log(err)).listen(argo.from_port,argo.from_host||'0.0.0.0');

node proxy /to_host= /to_port= /from_port