/**
* Query DNS server for answer records.
*
* @param string $server DNS server IP.
* @param string $host Host name to be resolved.
* @param int $type Question type (A or AAAA).
* @return array Resolved IP addresses.
*/
protected function queryServer(string $server, string $host, int $type) : \Generator
{
$transport = (yield from $this->createTransport($server));
try {
$request = new Request();
$request->addQuestion($host, $type);
$request->setRecursionDesired(true);
yield from $transport->write($request->encode());
$response = (yield from (new ResponseParser($transport))->parse($request));
} finally {
$transport->close();
}
return $response->getAnswers();
}
