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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of Badcow DNS Library. |
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* |
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* (c) Samuel Williams <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Badcow\DNS; |
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use Badcow\DNS\Rdata\A; |
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use Badcow\DNS\Rdata\DecodeException; |
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use Badcow\DNS\Rdata\Factory; |
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use Badcow\DNS\Rdata\RdataInterface; |
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use InvalidArgumentException; |
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class ResourceRecord |
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{ |
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/** |
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* @var int|null |
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*/ |
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private $classId = 1; |
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/** |
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* @var RdataInterface|null |
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*/ |
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private $rdata; |
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/** |
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* @var int|null |
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*/ |
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private $ttl; |
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/** |
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* @var string |
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*/ |
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private $name; |
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/** |
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* @var string|null |
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*/ |
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private $comment; |
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/** |
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* @param int $ttl |
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* @param string $comment |
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*/ |
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public static function create(string $name, RdataInterface $rdata, int $ttl = null, string $class = Classes::INTERNET, string $comment = null): ResourceRecord |
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{ |
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$rr = new self(); |
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$rr->setName($name); |
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$rr->setRdata($rdata); |
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$rr->setTtl($ttl); |
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$rr->setClass($class); |
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$rr->setComment($comment); |
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return $rr; |
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} |
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/** |
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* Set the class for the resource record |
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* Usually one of IN, HS, or CH. |
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* |
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* @param string $class |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function setClass(?string $class): void |
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{ |
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if (null !== $class && !Classes::isValid($class)) { |
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throw new InvalidArgumentException(sprintf('No such class as "%s"', $class)); |
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} |
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if (null === $class) { |
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$this->classId = null; |
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return; |
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} |
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$this->classId = Classes::getClassId($class); |
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} |
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/** |
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* Set the name for the resource record. |
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* Eg. "subdomain.example.com.". |
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*/ |
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public function setName(string $name): void |
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{ |
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$this->name = $name; |
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} |
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/** |
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* @param RdataInterface $rdata |
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*/ |
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public function setRdata(?RdataInterface $rdata): void |
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{ |
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$this->rdata = $rdata; |
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} |
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/** |
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* @return string |
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*/ |
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public function getClass(): ?string |
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{ |
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if (null === $this->classId) { |
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return null; |
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} |
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return Classes::getClassName($this->classId); |
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} |
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public function setClassId(int $classId): void |
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{ |
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$this->classId = $classId; |
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} |
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public function getClassId(): ?int |
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{ |
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return $this->classId; |
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} |
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/** |
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* Set the time to live. |
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* |
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* @param int $ttl |
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*/ |
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public function setTtl(?int $ttl): void |
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{ |
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$this->ttl = $ttl; |
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} |
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/** |
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* @return string |
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*/ |
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public function getName(): ?string |
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{ |
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return $this->name; |
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} |
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/** |
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* @return string |
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*/ |
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public function getType(): ?string |
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{ |
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if (null === $this->rdata) { |
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return null; |
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} |
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return $this->rdata->getType(); |
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} |
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/** |
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* @return RdataInterface |
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*/ |
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public function getRdata(): ?RdataInterface |
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{ |
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return $this->rdata; |
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} |
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/** |
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* @return int |
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*/ |
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public function getTtl(): ?int |
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{ |
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return $this->ttl; |
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} |
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/** |
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* Set a comment for the record. |
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* |
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* @param string $comment |
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*/ |
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public function setComment(?string $comment): void |
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{ |
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$this->comment = $comment; |
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} |
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/** |
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* Get the record's comment. |
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* |
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* @return string |
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*/ |
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public function getComment(): ?string |
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{ |
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return $this->comment; |
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} |
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/** |
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* @throws UnsetValueException|InvalidArgumentException |
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*/ |
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public function toWire(): string |
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{ |
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if (null === $this->name) { |
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throw new UnsetValueException('ResourceRecord name has not been set.'); |
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} |
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if (null === $this->rdata) { |
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throw new UnsetValueException('ResourceRecord rdata has not been set.'); |
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} |
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if (null === $this->classId) { |
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throw new UnsetValueException('ResourceRecord class has not been set.'); |
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} |
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if (null === $this->ttl) { |
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throw new UnsetValueException('ResourceRecord TTL has not been set.'); |
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} |
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if (!Validator::fullyQualifiedDomainName($this->name)) { |
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throw new InvalidArgumentException(sprintf('"%s" is not a fully qualified domain name.', $this->name)); |
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} |
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$rdata = $this->rdata->toWire(); |
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$encoded = Message::encodeName($this->name); |
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$encoded .= pack('nnNn', |
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$this->rdata->getTypeCode(), |
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$this->classId, |
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$this->ttl, |
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strlen($rdata) |
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); |
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$encoded .= $rdata; |
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return $encoded; |
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} |
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/** |
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* @throws Rdata\UnsupportedTypeException |
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*/ |
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public static function fromWire(string $encoded, int &$offset = 0): ResourceRecord |
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{ |
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$rr = new self(); |
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$rr->setName(Message::decodeName($encoded, $offset)); |
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if (false === $integers = unpack('ntype/nclass/Nttl/ndlength', $encoded, $offset)) { |
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throw new \UnexpectedValueException(sprintf('Malformed resource record encountered. "%s"', DecodeException::binaryToHex($encoded))); |
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} |
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$offset += 10; |
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$rr->setClassId($integers['class']); |
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$rr->setTtl($integers['ttl']); |
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$rdLength = $integers['dlength']; |
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$rdata = Factory::newRdataFromId($integers['type']); |
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$rdata->fromWire($encoded, $offset, $rdLength); |
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$rr->setRdata($rdata); |
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return $rr; |
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} |
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} |
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