getport/index.js

Find an open port to listen on.

var net = require('net')

function openport (start, end, cb) {
  if (!cb) {
    if (!end) {
      cb = start
      start = 2000
      end = 60000
    } else {
      cb = end
      end = 60000
    }
  }
  if (start >= end) return cb(new Error('out of ports :('))

  var c = net.connect(start, function () {
    c.destroy()
    openport(start+1, end, cb)
  })
  c.on('error', function () {
    cb(null, start)
  })
}

module.exports = openport