dns-suite.js/listen.js

'use strict';

var dgram = require('dgram');
var socket = dgram.createSocket({
  type: 'udp4'
, reuseAddr: true
});
var dns = require('dns-js');
//var DNSPacket = dns.DNSPacket;

var broadcast = '224.0.0.251'; // mdns
var port = 5353;               // mdns

// ex: pad('11111', 8, '0')
function pad(str, len, ch) {

  while (str.length < len) {
    str = ch + str;
  }

  return str;
}

socket.on('message', function (message, rinfo) {
  console.log('Received %d bytes from %s:%d\n',
    message.length, rinfo.address, rinfo.port);
  //console.log(msg.toString('utf8'));

  message.forEach(function(byte){

    console.log(pad(byte.toString(2), 8,'0'));

  });

  console.log('got here');
  console.log(message.toString('hex'));
  console.log(message.toString('ascii'));
  var packets;

  try {
    packets = dns.DNSPacket.parse(message);
  }
  catch (er) {
    //partial, skip it
    console.error(er);
    return;
  }

  if (!Array.isArray(packets)) { packets = [packets]; }

  require('./cloud-respond.js').respond(socket, packets, rinfo);

  // console.log(packets);
  // console.log('\n');
});

socket.bind(port, function () {
  console.log('***********************************')
  console.log('bound on', port);
  console.log('***********************************')
  console.log('bound on', this.address());

  socket.setBroadcast(true);
  socket.addMembership(broadcast);

  // buf.forEach parseInt(byte.toString('hex'), 16).toString(2);
});