Function createDnsServer

test/parallel/test-http-autoselectfamily.js:33–58

(ipv6Addr, ipv4Addr, cb)

}

function createDnsServer(ipv6Addr, ipv4Addr, cb) {
  // Create a DNS server which replies with a AAAA and a A record for the same host
  const socket = dgram.createSocket('udp4');

  socket.on('message', common.mustCall((msg, { address, port }) => {
    const parsed = parseDNSPacket(msg);
    const domain = parsed.questions[0].domain;
    assert.strictEqual(domain, 'example.org');

    socket.send(writeDNSPacket({
      id: parsed.id,
      questions: parsed.questions,
      answers: [
        { type: 'AAAA', address: ipv6Addr, ttl: 123, domain: 'example.org' },
        { type: 'A', address: ipv4Addr, ttl: 123, domain: 'example.org' },
      ]
    }), port, address);
  }));

  socket.bind(0, () => {
    const resolver = new Resolver();
    resolver.setServers([`127.0.0.1:${socket.address().port}`]);

    cb({ dnsServer: socket, lookup: _lookup.bind(null, resolver) });
  });
}

// Test that IPV4 is reached if IPV6 is not reachable
{