Crappy NodeJS DNS logger for debugging (plus response overrides!)

dnslog.js

const dnsServer = require('dnsd');
const { Resolver } = require('dns').promises;

const overrides = [
  { name: 'game-prod.indreams.me', type: 'A', addresses: [`52.213.80.7`, `54.194.121.14`, `34.251.37.65`] }
];

const resolver = new Resolver();
resolver.setServers(['1.1.1.1']);

const server = dnsServer.createServer(function(req, res) {
  let logLines = [];
  const { connection, type, id } = req;
  const question = req.question[0];

  logLines.push('-------------------------------');
  logLines.push('connection:');
  logLines.push(`  type: ${ connection.type }, remote addr: ${ connection.remoteAddress }, remote port: ${ connection.remotePort }`);
  logLines.push('question:');
  logLines.push(`  name: ${ question.name }, type: ${ question.type }, class: ${ question.class }`);

  function doResponse(name, type, addresses) {
    addresses.forEach(address => {
      res.answer.push({ 
        name: name,
        type: type,
        data: address,
        ttl: 60
      });
    });
    res.end();
  }

  const override = overrides.find(override => (override.type === question.type) && (override.name === question.name));

  if (override) {
    const addresses = override.addresses;
    logLines.push('answer (override):');
    logLines.push(`  ${ addresses.join(', ') }`);
    doResponse(question.name, question.type, addresses);
    console.log(logLines.join('\n'));
    logLines = [];
  }

  else {
    resolver.resolve(question.name, question.type).then((addresses) => {
      logLines.push('answer (passthrough):');
      logLines.push(`  ${ addresses.join(', ') }`);
      doResponse(question.name, question.type, addresses);
      console.log(logLines.join('\n'));
      logLines = [];
    });
  }
});

server.listen(53, '0.0.0.0');

console.log('DNS running');