dns.js

// Custom DNS resolver made by SiebeDW. Powered by google dns.
// Supported: SRV (not all errors support)
module.exports.resolveSrv = function(hostname, callback) {
  const Http = new XMLHttpRequest();
  const url = `https://dns.google.com/resolve?name=${hostname}&type=SRV`;
  Http.open("GET", url);
  Http.responseType = "json";
  Http.send();

  Http.onload = function() {
    const response = Http.response;
    if (response.Status === 3) {
      const err = new Error("querySrv ENOTFOUND");
      err.code = "ENOTFOUND";
      callback(err);
      return;
    }
    if (!response.Answer || response.Answer.length < 1) {
      const err = new Error("querySrv ENODATA");
      err.code = "ENODATA";
      callback(err);
      return;
    }
    const willreturn = [];
    response.Answer.forEach(function(object) {
      const data = object.data.split(" ");
      willreturn.push({
        priority: data[0],
        weight: data[1],
        port: data[2],
        name: data[3]
      });
    });
    callback(null, willreturn);
  };
};