Dns server

server.js

var dns = require('native-dns');
var server = dns.createServer();
const secondaryDns = { address: "8.8.8.8", port: 53, type: 'udp' };
const hosts = [
  { name: "host1.nextagilesoftdev.com", address: "192.168.1.41", ttl: 6000 },
  { name: "host3.nextagilesoftdev.com", address: "192.168.1.8", ttl: 6000 },
  { name: "host4.nextagilesoftdev.com", address: "192.168.1.8", ttl: 6000 },
]
server.serve(53);

/**
 * Search Forward to other dns
 * @param {any}  question Question to be
 * @param {Function}  callback Callback function
 * @returns {any} Nothing
 */
const searchForward = function (question, callback) {
  const nativeQuestion1 = dns.Question(question);

  const nativeReq = dns.Request({
    question: nativeQuestion1,
    server: secondaryDns
  });
  nativeReq.on('message', (err, answer) => {
    if (err) {
      return callback(err, null)
    }

    return callback(null, answer.answer)
  });

  nativeReq.send();
}
server.on('request', function (request, response) {
  const question = request.question[0]
  const name = question.name;
  const r = hosts.find(a => a.name === name)
  if (r) {
    response.answer.push(dns.A(r))
    response.send();
  } else {
    searchForward(question, (err, answers) => {
      if (err) {
        return;
      }

      answers.forEach(answer => response.answer.push(answer))
      response.send();
    });
  }
});

server.on('error', function (err, buff, req, res) {
  console.log(err.stack);
  throw err
});