facehugger.js

#!/usr/bin/env node

var sys = require('sys')
var net = require('net')
var child_process = require('child_process')

if (!process.env.PORT) {
  sys.puts('Must specify PORT')
  process.exit()
}

var port = parseInt(process.env.PORT)
sys.puts('Listening on port ' + port)

cmd = process.argv.slice(2, 99)

var server = net.createServer(function (socket) {
  socket.setEncoding('utf8')
  socket.addListener('connect', function () {
    sys.puts('Got connection, spawning process: ' + cmd.join(' ') + '\n------------------')
    ps = child_process.spawn(cmd[0], cmd.slice(1, 99))

    // Input
    socket.addListener('data', function (data) {
      sys.puts('input: ' + data)
      ps.stdin.write(data)
    })

    // Output
    ps.stdout.addListener('data', function (data) {
      socket.write(data)
      sys.print(data)
    })
    ps.stderr.addListener('data', function (data) {
      socket.write(data)
      sys.print(data)
    })

    ps.addListener('exit', function () {
      socket.end()
    })
  })
  socket.addListener('end', function () {
    sys.puts('-----------------\nDone')
    process.exit()
  })
})
server.listen(port)

usage.txt

$ PORT=9000 node facehugger.js -- /your/program arg1 arg2