/** * Decode the header section of the message * * @param \LibDNS\Decoder\DecodingContext $decodingContext * @param \LibDNS\Messages\Message $message * @throws \UnexpectedValueException When the header section is invalid */ private function decodeHeader(DecodingContext $decodingContext, Message $message) { $header = unpack('nid/nmeta/nqd/nan/nns/nar', $this->readDataFromPacket($decodingContext->getPacket(), 12)); if (!$header) { throw new \UnexpectedValueException('Decode error: Header unpack failed'); } $message->setID($header['id']); $message->setType(($header['meta'] & 0b1000000000000000) >> 15); $message->setOpCode(($header['meta'] & 0b111100000000000) >> 11); $message->isAuthoritative(($header['meta'] & 0b10000000000) >> 10); $message->isTruncated(($header['meta'] & 0b1000000000) >> 9); $message->isRecursionDesired(($header['meta'] & 0b100000000) >> 8); $message->isRecursionAvailable(($header['meta'] & 0b10000000) >> 7); $message->setResponseCode($header['meta'] & 0b1111); $decodingContext->setExpectedQuestionRecords($header['qd']); $decodingContext->setExpectedAnswerRecords($header['an']); $decodingContext->setExpectedAuthorityRecords($header['ns']); $decodingContext->setExpectedAdditionalRecords($header['ar']); }
/** * Encode a Message to raw network data * * @param \LibDNS\Messages\Message $message The Message to encode * @param bool $compress Enable message compression * @return string */ public function encode(Message $message, $compress = true) { $packet = $this->packetFactory->create(); $encodingContext = $this->encodingContextFactory->create($packet, $compress); foreach ($message->getQuestionRecords() as $record) { /** @var \LibDNS\Records\Question $record */ $this->encodeQuestionRecord($encodingContext, $record); } foreach ($message->getAnswerRecords() as $record) { /** @var \LibDNS\Records\Resource $record */ $this->encodeResourceRecord($encodingContext, $record); } foreach ($message->getAuthorityRecords() as $record) { /** @var \LibDNS\Records\Resource $record */ $this->encodeResourceRecord($encodingContext, $record); } foreach ($message->getAdditionalRecords() as $record) { /** @var \LibDNS\Records\Resource $record */ $this->encodeResourceRecord($encodingContext, $record); } return $this->encodeHeader($encodingContext, $message) . $packet->read($packet->getLength()); }