Initial Commit

This commit is contained in:
David Stone
2024-11-30 18:24:12 -07:00
commit e8f7955c1c
5432 changed files with 1397750 additions and 0 deletions

View File

@ -0,0 +1,445 @@
<?php
declare (strict_types=1);
/**
* Decodes raw network data to Message objects
*
* PHP version 5.4
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
* @copyright Copyright (c) Chris Wright <https://github.com/DaveRandom>
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @version 2.0.0
*/
namespace WP_Ultimo\Dependencies\LibDNS\Decoder;
use WP_Ultimo\Dependencies\LibDNS\Messages\Message;
use WP_Ultimo\Dependencies\LibDNS\Messages\MessageFactory;
use WP_Ultimo\Dependencies\LibDNS\Packets\Packet;
use WP_Ultimo\Dependencies\LibDNS\Packets\PacketFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\Question;
use WP_Ultimo\Dependencies\LibDNS\Records\QuestionFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\Resource;
use WP_Ultimo\Dependencies\LibDNS\Records\ResourceBuilder;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Anything;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\BitMap;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Char;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\CharacterString;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\DomainName;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\IPv4Address;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\IPv6Address;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Long;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Short;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Type;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\TypeBuilder;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\Types;
/**
* Decodes raw network data to Message objects
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
*/
class Decoder
{
/**
* @var \LibDNS\Packets\PacketFactory
*/
private $packetFactory;
/**
* @var \LibDNS\Messages\MessageFactory
*/
private $messageFactory;
/**
* @var \LibDNS\Records\QuestionFactory
*/
private $questionFactory;
/**
* @var \LibDNS\Records\ResourceBuilder
*/
private $resourceBuilder;
/**
* @var \LibDNS\Records\Types\TypeBuilder
*/
private $typeBuilder;
/**
* @var \LibDNS\Decoder\DecodingContextFactory
*/
private $decodingContextFactory;
/**
* @var bool
*/
private $allowTrailingData;
/**
* Constructor
*
* @param \LibDNS\Packets\PacketFactory $packetFactory
* @param \LibDNS\Messages\MessageFactory $messageFactory
* @param \LibDNS\Records\QuestionFactory $questionFactory
* @param \LibDNS\Records\ResourceBuilder $resourceBuilder
* @param \LibDNS\Records\Types\TypeBuilder $typeBuilder
* @param \LibDNS\Decoder\DecodingContextFactory $decodingContextFactory
* @param bool $allowTrailingData
*/
public function __construct(PacketFactory $packetFactory, MessageFactory $messageFactory, QuestionFactory $questionFactory, ResourceBuilder $resourceBuilder, TypeBuilder $typeBuilder, DecodingContextFactory $decodingContextFactory, bool $allowTrailingData = \true)
{
$this->packetFactory = $packetFactory;
$this->messageFactory = $messageFactory;
$this->questionFactory = $questionFactory;
$this->resourceBuilder = $resourceBuilder;
$this->typeBuilder = $typeBuilder;
$this->decodingContextFactory = $decodingContextFactory;
$this->allowTrailingData = $allowTrailingData;
}
/**
* Read a specified number of bytes of data from a packet
*
* @param \LibDNS\Packets\Packet $packet
* @param int $length
* @return string
* @throws \UnexpectedValueException When the read operation does not result in the requested number of bytes
*/
private function readDataFromPacket(Packet $packet, int $length) : string
{
if ($packet->getBytesRemaining() < $length) {
throw new \UnexpectedValueException('Decode error: Incomplete packet (tried to read ' . $length . ' bytes from index ' . $packet->getPointer());
}
return $packet->read($length);
}
/**
* 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);
$message->isAuthoritative((bool) (($header['meta'] & 0b10000000000) >> 10));
$message->isTruncated((bool) (($header['meta'] & 0b1000000000) >> 9));
$message->isRecursionDesired((bool) (($header['meta'] & 0b100000000) >> 8));
$message->isRecursionAvailable((bool) (($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']);
}
/**
* Decode an Anything field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\Anything $anything The object to populate with the result
* @param int $length
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeAnything(DecodingContext $decodingContext, Anything $anything, int $length) : int
{
$anything->setValue($this->readDataFromPacket($decodingContext->getPacket(), $length));
return $length;
}
/**
* Decode a BitMap field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\BitMap $bitMap The object to populate with the result
* @param int $length
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeBitMap(DecodingContext $decodingContext, BitMap $bitMap, int $length) : int
{
$bitMap->setValue($this->readDataFromPacket($decodingContext->getPacket(), $length));
return $length;
}
/**
* Decode a Char field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\Char $char The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeChar(DecodingContext $decodingContext, Char $char) : int
{
$value = \unpack('C', $this->readDataFromPacket($decodingContext->getPacket(), 1))[1];
$char->setValue($value);
return 1;
}
/**
* Decode a CharacterString field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\CharacterString $characterString The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeCharacterString(DecodingContext $decodingContext, CharacterString $characterString) : int
{
$packet = $decodingContext->getPacket();
$length = \ord($this->readDataFromPacket($packet, 1));
$characterString->setValue($this->readDataFromPacket($packet, $length));
return $length + 1;
}
/**
* Decode a DomainName field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\DomainName $domainName The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeDomainName(DecodingContext $decodingContext, DomainName $domainName) : int
{
$packet = $decodingContext->getPacket();
$startIndex = '0x' . \dechex($packet->getPointer());
$labelRegistry = $decodingContext->getLabelRegistry();
$labels = [];
$totalLength = 0;
while (++$totalLength && ($length = \ord($this->readDataFromPacket($packet, 1)))) {
$labelType = $length & 0b11000000;
if ($labelType === 0b0) {
$index = $packet->getPointer() - 1;
$label = $this->readDataFromPacket($packet, $length);
\array_unshift($labels, [$index, $label]);
$totalLength += $length;
} else {
if ($labelType === 0b11000000) {
$index = ($length & 0b111111) << 8 | \ord($this->readDataFromPacket($packet, 1));
$ref = $labelRegistry->lookupLabel($index);
if ($ref === null) {
throw new \UnexpectedValueException('Decode error: Invalid compression pointer reference in domain name at position ' . $startIndex);
}
\array_unshift($labels, $ref);
$totalLength++;
break;
} else {
throw new \UnexpectedValueException('Decode error: Invalid label type ' . $labelType . 'in domain name at position ' . $startIndex);
}
}
}
$result = [];
foreach ($labels as $label) {
if (\is_int($label[0])) {
\array_unshift($result, $label[1]);
$labelRegistry->register($result, $label[0]);
} else {
$result = $label;
}
}
$domainName->setLabels($result);
return $totalLength;
}
/**
* Decode an IPv4Address field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\IPv4Address $ipv4Address The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeIPv4Address(DecodingContext $decodingContext, IPv4Address $ipv4Address) : int
{
$octets = \unpack('C4', $this->readDataFromPacket($decodingContext->getPacket(), 4));
$ipv4Address->setOctets($octets);
return 4;
}
/**
* Decode an IPv6Address field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\IPv6Address $ipv6Address The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeIPv6Address(DecodingContext $decodingContext, IPv6Address $ipv6Address) : int
{
$shorts = \unpack('n8', $this->readDataFromPacket($decodingContext->getPacket(), 16));
$ipv6Address->setShorts($shorts);
return 16;
}
/**
* Decode a Long field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\Long $long The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeLong(DecodingContext $decodingContext, Long $long) : int
{
$value = \unpack('N', $this->readDataFromPacket($decodingContext->getPacket(), 4))[1];
$long->setValue($value);
return 4;
}
/**
* Decode a Short field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\Short $short The object to populate with the result
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
*/
private function decodeShort(DecodingContext $decodingContext, Short $short) : int
{
$value = \unpack('n', $this->readDataFromPacket($decodingContext->getPacket(), 2))[1];
$short->setValue($value);
return 2;
}
/**
* Decode a Type field
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @param \LibDNS\Records\Types\Type $type The object to populate with the result
* @param int $length Expected data length
* @return int The number of packet bytes consumed by the operation
* @throws \UnexpectedValueException When the packet data is invalid
* @throws \InvalidArgumentException When the Type subtype is unknown
*/
private function decodeType(DecodingContext $decodingContext, Type $type, int $length) : int
{
if ($type instanceof Anything) {
$result = $this->decodeAnything($decodingContext, $type, $length);
} else {
if ($type instanceof BitMap) {
$result = $this->decodeBitMap($decodingContext, $type, $length);
} else {
if ($type instanceof Char) {
$result = $this->decodeChar($decodingContext, $type);
} else {
if ($type instanceof CharacterString) {
$result = $this->decodeCharacterString($decodingContext, $type);
} else {
if ($type instanceof DomainName) {
$result = $this->decodeDomainName($decodingContext, $type);
} else {
if ($type instanceof IPv4Address) {
$result = $this->decodeIPv4Address($decodingContext, $type);
} else {
if ($type instanceof IPv6Address) {
$result = $this->decodeIPv6Address($decodingContext, $type);
} else {
if ($type instanceof Long) {
$result = $this->decodeLong($decodingContext, $type);
} else {
if ($type instanceof Short) {
$result = $this->decodeShort($decodingContext, $type);
} else {
throw new \InvalidArgumentException('Unknown Type ' . \get_class($type));
}
}
}
}
}
}
}
}
}
return $result;
}
/**
* Decode a question record
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @return \LibDNS\Records\Question
* @throws \UnexpectedValueException When the record is invalid
*/
private function decodeQuestionRecord(DecodingContext $decodingContext) : Question
{
/** @var \LibDNS\Records\Types\DomainName $domainName */
$domainName = $this->typeBuilder->build(Types::DOMAIN_NAME);
$this->decodeDomainName($decodingContext, $domainName);
$meta = \unpack('ntype/nclass', $this->readDataFromPacket($decodingContext->getPacket(), 4));
$question = $this->questionFactory->create($meta['type']);
$question->setName($domainName);
$question->setClass($meta['class']);
return $question;
}
/**
* Decode a resource record
*
* @param \LibDNS\Decoder\DecodingContext $decodingContext
* @return \LibDNS\Records\Resource
* @throws \UnexpectedValueException When the record is invalid
* @throws \InvalidArgumentException When a type subtype is unknown
*/
private function decodeResourceRecord(DecodingContext $decodingContext) : Resource
{
/** @var \LibDNS\Records\Types\DomainName $domainName */
$domainName = $this->typeBuilder->build(Types::DOMAIN_NAME);
$this->decodeDomainName($decodingContext, $domainName);
$meta = \unpack('ntype/nclass/Nttl/nlength', $this->readDataFromPacket($decodingContext->getPacket(), 10));
$resource = $this->resourceBuilder->build($meta['type']);
$resource->setName($domainName);
$resource->setClass($meta['class']);
$resource->setTTL($meta['ttl']);
$data = $resource->getData();
$remainingLength = $meta['length'];
$fieldDef = $index = null;
foreach ($resource->getData()->getTypeDefinition() as $index => $fieldDef) {
$field = $this->typeBuilder->build($fieldDef->getType());
$remainingLength -= $this->decodeType($decodingContext, $field, $remainingLength);
$data->setField($index, $field);
}
if ($fieldDef->allowsMultiple()) {
while ($remainingLength) {
$field = $this->typeBuilder->build($fieldDef->getType());
$remainingLength -= $this->decodeType($decodingContext, $field, $remainingLength);
$data->setField(++$index, $field);
}
}
if ($remainingLength !== 0) {
throw new \UnexpectedValueException('Decode error: Invalid length for record data section');
}
return $resource;
}
/**
* Decode a Message from raw network data
*
* @param string $data The data string to decode
* @return \LibDNS\Messages\Message
* @throws \UnexpectedValueException When the packet data is invalid
* @throws \InvalidArgumentException When a type subtype is unknown
*/
public function decode(string $data) : Message
{
$packet = $this->packetFactory->create($data);
$decodingContext = $this->decodingContextFactory->create($packet);
$message = $this->messageFactory->create();
$this->decodeHeader($decodingContext, $message);
$questionRecords = $message->getQuestionRecords();
$expected = $decodingContext->getExpectedQuestionRecords();
for ($i = 0; $i < $expected; $i++) {
$questionRecords->add($this->decodeQuestionRecord($decodingContext));
}
$answerRecords = $message->getAnswerRecords();
$expected = $decodingContext->getExpectedAnswerRecords();
for ($i = 0; $i < $expected; $i++) {
$answerRecords->add($this->decodeResourceRecord($decodingContext));
}
$authorityRecords = $message->getAuthorityRecords();
$expected = $decodingContext->getExpectedAuthorityRecords();
for ($i = 0; $i < $expected; $i++) {
$authorityRecords->add($this->decodeResourceRecord($decodingContext));
}
$additionalRecords = $message->getAdditionalRecords();
$expected = $decodingContext->getExpectedAdditionalRecords();
for ($i = 0; $i < $expected; $i++) {
$additionalRecords->add($this->decodeResourceRecord($decodingContext));
}
if (!$this->allowTrailingData && $packet->getBytesRemaining() !== 0) {
throw new \UnexpectedValueException('Decode error: Unexpected data at end of packet');
}
return $message;
}
}

View File

@ -0,0 +1,52 @@
<?php
declare (strict_types=1);
/**
* Creates Decoder objects
*
* PHP version 5.4
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
* @copyright Copyright (c) Chris Wright <https://github.com/DaveRandom>
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @version 2.0.0
*/
namespace WP_Ultimo\Dependencies\LibDNS\Decoder;
use WP_Ultimo\Dependencies\LibDNS\Packets\PacketFactory;
use WP_Ultimo\Dependencies\LibDNS\Messages\MessageFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\RecordCollectionFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\QuestionFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\ResourceBuilder;
use WP_Ultimo\Dependencies\LibDNS\Records\ResourceFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\RDataBuilder;
use WP_Ultimo\Dependencies\LibDNS\Records\RDataFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\TypeBuilder;
use WP_Ultimo\Dependencies\LibDNS\Records\Types\TypeFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\TypeDefinitions\TypeDefinitionManager;
use WP_Ultimo\Dependencies\LibDNS\Records\TypeDefinitions\TypeDefinitionFactory;
use WP_Ultimo\Dependencies\LibDNS\Records\TypeDefinitions\FieldDefinitionFactory;
/**
* Creates Decoder objects
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
*/
class DecoderFactory
{
/**
* Create a new Decoder object
*
* @param \LibDNS\Records\TypeDefinitions\TypeDefinitionManager $typeDefinitionManager
* @param bool $allowTrailingData
* @return Decoder
*/
public function create(TypeDefinitionManager $typeDefinitionManager = null, bool $allowTrailingData = \true) : Decoder
{
$typeBuilder = new TypeBuilder(new TypeFactory());
return new Decoder(new PacketFactory(), new MessageFactory(new RecordCollectionFactory()), new QuestionFactory(), new ResourceBuilder(new ResourceFactory(), new RDataBuilder(new RDataFactory(), $typeBuilder), $typeDefinitionManager ?: new TypeDefinitionManager(new TypeDefinitionFactory(), new FieldDefinitionFactory())), $typeBuilder, new DecodingContextFactory(), $allowTrailingData);
}
}

View File

@ -0,0 +1,154 @@
<?php
declare (strict_types=1);
/**
* Holds data associated with a decode operation
*
* PHP version 5.4
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
* @copyright Copyright (c) Chris Wright <https://github.com/DaveRandom>
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @version 2.0.0
*/
namespace WP_Ultimo\Dependencies\LibDNS\Decoder;
use WP_Ultimo\Dependencies\LibDNS\Packets\Packet;
use WP_Ultimo\Dependencies\LibDNS\Packets\LabelRegistry;
/**
* Holds data associated with a decode operation
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
*/
class DecodingContext
{
/**
* @var \LibDNS\Packets\Packet
*/
private $packet;
/**
* @var \LibDNS\Packets\LabelRegistry
*/
private $labelRegistry;
/**
* @var int
*/
private $expectedQuestionRecords = 0;
/**
* @var int
*/
private $expectedAnswerRecords = 0;
/**
* @var int
*/
private $expectedAuthorityRecords = 0;
/**
* @var int
*/
private $expectedAdditionalRecords = 0;
/**
* Constructor
*
* @param \LibDNS\Packets\Packet $packet
* @param \LibDNS\Packets\LabelRegistry $labelRegistry
*/
public function __construct(Packet $packet, LabelRegistry $labelRegistry)
{
$this->packet = $packet;
$this->labelRegistry = $labelRegistry;
}
/**
* Get the packet
*
* @return \LibDNS\Packets\Packet
*/
public function getPacket() : Packet
{
return $this->packet;
}
/**
* Get the label registry
*
* @return \LibDNS\Packets\LabelRegistry
*/
public function getLabelRegistry() : LabelRegistry
{
return $this->labelRegistry;
}
/**
* Get the number of question records expected in the message
*
* @return int
*/
public function getExpectedQuestionRecords() : int
{
return $this->expectedQuestionRecords;
}
/**
* Get the number of question records expected in the message
*
* @param int $expectedQuestionRecords
*/
public function setExpectedQuestionRecords(int $expectedQuestionRecords)
{
$this->expectedQuestionRecords = $expectedQuestionRecords;
}
/**
* Get the number of answer records expected in the message
*
* @return int
*/
public function getExpectedAnswerRecords() : int
{
return $this->expectedAnswerRecords;
}
/**
* Set the number of answer records expected in the message
*
* @param int $expectedAnswerRecords
*/
public function setExpectedAnswerRecords(int $expectedAnswerRecords)
{
$this->expectedAnswerRecords = $expectedAnswerRecords;
}
/**
* Get the number of authority records expected in the message
*
* @return int
*/
public function getExpectedAuthorityRecords() : int
{
return $this->expectedAuthorityRecords;
}
/**
* Set the number of authority records expected in the message
*
* @param int $expectedAuthorityRecords
*/
public function setExpectedAuthorityRecords(int $expectedAuthorityRecords)
{
$this->expectedAuthorityRecords = $expectedAuthorityRecords;
}
/**
* Get the number of additional records expected in the message
*
* @return int
*/
public function getExpectedAdditionalRecords() : int
{
return $this->expectedAdditionalRecords;
}
/**
* Set the number of additional records expected in the message
*
* @param int $expectedAdditionalRecords
*/
public function setExpectedAdditionalRecords(int $expectedAdditionalRecords)
{
$this->expectedAdditionalRecords = $expectedAdditionalRecords;
}
}

View File

@ -0,0 +1,39 @@
<?php
declare (strict_types=1);
/**
* Creates DecodingContext objects
*
* PHP version 5.4
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
* @copyright Copyright (c) Chris Wright <https://github.com/DaveRandom>
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @version 2.0.0
*/
namespace WP_Ultimo\Dependencies\LibDNS\Decoder;
use WP_Ultimo\Dependencies\LibDNS\Packets\Packet;
use WP_Ultimo\Dependencies\LibDNS\Packets\LabelRegistry;
/**
* Creates DecodingContext objects
*
* @category LibDNS
* @package Decoder
* @author Chris Wright <https://github.com/DaveRandom>
*/
class DecodingContextFactory
{
/**
* Create a new DecodingContext object
*
* @param \LibDNS\Packets\Packet $packet The packet to be decoded
* @return \LibDNS\Decoder\DecodingContext
*/
public function create(Packet $packet) : DecodingContext
{
return new DecodingContext($packet, new LabelRegistry());
}
}