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<?php |
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/* |
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* This file is part of PHP DNS Server. |
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* |
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* (c) Yif Swery <[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 yswery\DNS; |
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class RdataDecoder |
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{ |
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/** |
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* Maps an RData type to its decoder method. |
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* |
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* @var array |
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*/ |
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private static $methodMap = [ |
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RecordTypeEnum::TYPE_A => 'a', |
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RecordTypeEnum::TYPE_AAAA => 'a', |
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RecordTypeEnum::TYPE_CNAME => 'cname', |
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RecordTypeEnum::TYPE_DNAME => 'cname', |
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RecordTypeEnum::TYPE_NS => 'cname', |
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RecordTypeEnum::TYPE_PTR => 'cname', |
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RecordTypeEnum::TYPE_SOA => 'soa', |
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RecordTypeEnum::TYPE_MX => 'mx', |
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RecordTypeEnum::TYPE_TXT => 'txt', |
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RecordTypeEnum::TYPE_SRV => 'srv', |
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]; |
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/** |
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* @param int $type |
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* @param string $rdata |
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* |
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* @return array|string |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public static function decodeRdata(int $type, string $rdata) |
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{ |
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if (!array_key_exists($type, self::$methodMap)) { |
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throw new UnsupportedTypeException( |
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sprintf('Record type "%s" is not a supported type.', RecordTypeEnum::getName($type)) |
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); |
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} |
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return call_user_func(['self', self::$methodMap[$type]], $rdata); |
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} |
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/** |
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* Used for A and AAAA records. |
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* |
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* @param string $rdata |
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* @return string |
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*/ |
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public static function a(string $rdata): string |
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{ |
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return inet_ntop($rdata); |
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} |
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/** |
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* Used for CNAME, DNAME, NS, and PTR records. |
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* |
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* @param string $rdata |
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* @return string |
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*/ |
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public static function cname(string $rdata): string |
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{ |
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return Decoder::decodeDomainName($rdata); |
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} |
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/** |
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* Exclusively for SOA records. |
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* |
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* @param string $rdata |
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* @return array |
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*/ |
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public static function soa(string $rdata): array |
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{ |
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$offset = 0; |
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return array_merge( |
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[ |
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'mname' => Decoder::decodeDomainName($rdata, $offset), |
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'rname' => Decoder::decodeDomainName($rdata, $offset), |
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], |
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unpack('Nserial/Nrefresh/Nretry/Nexpire/Nminimum', substr($rdata, $offset)) |
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); |
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} |
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/** |
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* Exclusively for MX records. |
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* |
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* @param string $rdata |
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* @return array |
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*/ |
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public static function mx(string $rdata): array |
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{ |
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return [ |
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'preference' => unpack('npreference', $rdata)['preference'], |
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'exchange' => Decoder::decodeDomainName(substr($rdata, 2)), |
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]; |
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} |
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/** |
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* Exclusively for TXT records. |
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* |
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* @param string $rdata |
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* @return string |
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*/ |
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public static function txt(string $rdata): string |
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{ |
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$len = ord($rdata[0]); |
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if ((strlen($rdata) + 1) < $len) { |
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return null; |
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} |
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return substr($rdata, 1, $len); |
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} |
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/** |
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* Exclusively for SRV records. |
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* |
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* @param string $rdata |
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* @return array |
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*/ |
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public static function srv(string $rdata): array |
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{ |
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$offset = 6; |
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$values = unpack('npriority/nweight/nport', $rdata); |
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$values['target'] = Decoder::decodeDomainName($rdata, $offset); |
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return $values; |
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} |
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} |
samuelwilliams /
PHP-DNS-SERVER
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