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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\Rdata; |
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use Badcow\DNS\Message; |
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use Badcow\DNS\Parser\Tokens; |
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use InvalidArgumentException; |
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class DS implements RdataInterface |
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1 |
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{ |
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use RdataTrait; |
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const TYPE = 'DS'; |
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const TYPE_CODE = 43; |
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const DIGEST_SHA1 = 1; |
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/** |
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* @var int |
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*/ |
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private $keyTag; |
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/** |
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* The Algorithm field lists the algorithm number of the DNSKEY RR |
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* referred to by the DS record. |
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* {@link https://tools.ietf.org/html/rfc4034#section-5.1.2}. |
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* |
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* @var int |
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*/ |
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private $algorithm; |
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/** |
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* @var int |
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*/ |
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private $digestType = self::DIGEST_SHA1; |
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/** |
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* @var string |
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*/ |
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private $digest; |
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4 |
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public function getKeyTag(): int |
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{ |
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return $this->keyTag; |
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} |
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public function setKeyTag(int $keyTag): void |
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{ |
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$this->keyTag = $keyTag; |
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} |
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public function getAlgorithm(): int |
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{ |
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return $this->algorithm; |
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} |
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public function setAlgorithm(int $algorithm): void |
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{ |
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$this->algorithm = $algorithm; |
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} |
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4 |
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public function getDigestType(): int |
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{ |
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return $this->digestType; |
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} |
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public function setDigestType(int $digestType): void |
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{ |
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$this->digestType = $digestType; |
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} |
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/** |
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* @return string the digest in its binary representation |
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*/ |
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public function getDigest(): string |
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4 |
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{ |
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return $this->digest; |
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} |
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/** |
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* @param string $digest the digest in its binary representation |
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*/ |
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public function setDigest(string $digest): void |
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{ |
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$this->digest = $digest; |
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} |
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/** |
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* Calculates the digest by concatenating the canonical form of the fully qualified owner name of the DNSKEY RR with |
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* the DNSKEY RDATA, and then applying the digest algorithm. |
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* |
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* @param string $owner canonical form of the fully qualified owner name of the DNSKEY RR |
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* @param DNSKEY $dnskey Owner's DNSKEY |
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*/ |
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public function calculateDigest(string $owner, DNSKEY $dnskey): void |
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{ |
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if (static::DIGEST_SHA1 !== $this->digestType) { |
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throw new InvalidArgumentException('Can only calculate SHA-1 digests.'); |
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} |
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$this->digest = sha1(Message::encodeName(strtolower($owner)).$dnskey->toWire(), true); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toText(): string |
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{ |
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return sprintf( |
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'%s %s %s %s', |
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$this->keyTag, |
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$this->algorithm, |
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$this->digestType, |
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strtoupper(bin2hex($this->digest)) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toWire(): string |
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{ |
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return pack('nCC', $this->keyTag, $this->algorithm, $this->digestType).$this->digest; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function fromText(string $text): void |
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{ |
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$rdata = explode(Tokens::SPACE, $text); |
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$this->setKeyTag((int) array_shift($rdata)); |
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$this->setAlgorithm((int) array_shift($rdata)); |
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$this->setDigestType((int) array_shift($rdata)); |
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if (false === $digest = hex2bin((string) array_shift($rdata))) { |
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throw new InvalidArgumentException(sprintf('The digest is not a valid hexadecimal string.')); |
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} |
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$this->setDigest($digest); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): void |
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{ |
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$digestLen = ($rdLength ?? strlen($rdata)) - 4; |
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$integers = unpack('ntag/Calgorithm/Cdtype', $rdata, $offset); |
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$offset += 4; |
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$this->setKeyTag($integers['tag']); |
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$this->setAlgorithm($integers['algorithm']); |
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$this->setDigestType($integers['dtype']); |
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$this->setDigest(substr($rdata, $offset, $digestLen)); |
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$offset += $digestLen; |
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} |
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} |
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Badcow /
DNS
