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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 RdataEncoder |
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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|array $rdata |
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* |
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* @return string |
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* |
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* @throws UnsupportedTypeException|\InvalidArgumentException |
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*/ |
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public static function encodeRdata(int $type, $rdata): string |
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{ |
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if (!array_key_exists($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 $rdata): string |
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{ |
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if (!filter_var($rdata, FILTER_VALIDATE_IP)) { |
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throw new \InvalidArgumentException(sprintf('The IP address "%s" is invalid.', $rdata)); |
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} |
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return inet_pton($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 $rdata): string |
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{ |
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return Encoder::encodeDomainName($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 array $rdata |
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* @return string |
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*/ |
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public static function soa(array $rdata): string |
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{ |
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return |
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Encoder::encodeDomainName($rdata['mname']). |
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Encoder::encodeDomainName($rdata['rname']). |
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1 |
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pack( |
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'NNNNN', |
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$rdata['serial'], |
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$rdata['refresh'], |
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$rdata['retry'], |
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$rdata['expire'], |
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$rdata['minimum'] |
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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 array $rdata |
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* @return string |
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*/ |
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public static function mx(array $rdata): string |
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{ |
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return pack('n', (int) $rdata['preference']).Encoder::encodeDomainName($rdata['exchange']); |
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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 $rdata): string |
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{ |
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$rdata = substr($rdata, 0, 255); |
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return chr(strlen($rdata)).$rdata; |
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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 array $rdata |
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* @return string |
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*/ |
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public static function srv(array $rdata): string |
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{ |
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return pack('nnn', (int) $rdata['priority'], (int) $rdata['weight'], (int) $rdata['port']). |
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Encoder::encodeDomainName($rdata['target']); |
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} |
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} |
samuelwilliams /
PHP-DNS-SERVER
