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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\Resolver; |
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use yswery\DNS\UnsupportedTypeException; |
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use yswery\DNS\ResourceRecord; |
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use yswery\DNS\RecordTypeEnum; |
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/** |
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* Use the host system's configured DNS. |
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*/ |
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class SystemResolver extends AbstractResolver |
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{ |
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/** |
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* SystemResolver constructor. |
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* |
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* @param bool $recursionAvailable |
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* @param bool $authoritative |
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*/ |
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public function __construct($recursionAvailable = true, $authoritative = false) |
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{ |
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$this->allowRecursion = (bool) $recursionAvailable; |
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$this->isAuthoritative = (bool) $authoritative; |
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} |
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/** |
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* @param ResourceRecord[] $queries |
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* |
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* @return ResourceRecord[] |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public function getAnswer(array $queries, ?string $client = null): array |
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{ |
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$answer = []; |
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foreach ($queries as $query) { |
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$answer = array_merge($answer, $this->getRecordsRecursively($query)); |
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} |
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return $answer; |
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} |
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/** |
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* Resolve the $query using the system configured local DNS. |
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* |
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* @param ResourceRecord $query |
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* |
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* @return ResourceRecord[] |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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private function getRecordsRecursively(ResourceRecord $query): array |
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{ |
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$records = dns_get_record($query->getName(), $this->IANA2PHP($query->getType())); |
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$result = []; |
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foreach ($records as $record) { |
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$result[] = (new ResourceRecord()) |
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->setName($query->getName()) |
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->setClass($query->getClass()) |
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->setTtl($record['ttl']) |
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->setRdata($this->extractPhpRdata($record)) |
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->setType($query->getType()); |
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} |
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return $result; |
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} |
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/** |
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* @param array $resourceRecord |
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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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protected function extractPhpRdata(array $resourceRecord) |
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{ |
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$type = RecordTypeEnum::getTypeFromName($resourceRecord['type']); |
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switch ($type) { |
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case RecordTypeEnum::TYPE_A: |
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return $resourceRecord['ip']; |
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case RecordTypeEnum::TYPE_AAAA: |
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return $resourceRecord['ipv6']; |
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case RecordTypeEnum::TYPE_NS: |
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case RecordTypeEnum::TYPE_CNAME: |
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case RecordTypeEnum::TYPE_PTR: |
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return $resourceRecord['target']; |
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case RecordTypeEnum::TYPE_SOA: |
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return [ |
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'mname' => $resourceRecord['mname'], |
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'rname' => $resourceRecord['rname'], |
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'serial' => $resourceRecord['serial'], |
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'refresh' => $resourceRecord['refresh'], |
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'retry' => $resourceRecord['retry'], |
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'expire' => $resourceRecord['expire'], |
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'minimum' => $resourceRecord['minimum-ttl'], |
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]; |
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case RecordTypeEnum::TYPE_MX: |
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return [ |
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'preference' => $resourceRecord['pri'], |
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'exchange' => $resourceRecord['host'], |
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]; |
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case RecordTypeEnum::TYPE_TXT: |
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return $resourceRecord['txt']; |
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case RecordTypeEnum::TYPE_SRV: |
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return [ |
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'priority' => $resourceRecord['pri'], |
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'port' => $resourceRecord['port'], |
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'weight' => $resourceRecord['weight'], |
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'target' => $resourceRecord['target'], |
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]; |
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default: |
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throw new UnsupportedTypeException( |
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sprintf('Record type "%s" is not a supported type.', RecordTypeEnum::getName($type)) |
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); |
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} |
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} |
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/** |
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* Maps an IANA Rdata type to the built-in PHP DNS constant. |
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* |
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* @example $this->IANA_to_PHP(5) //Returns DNS_CNAME int(16) |
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* |
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* @param int $type the IANA RTYPE |
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* |
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* @return int the built-in PHP DNS_<type> constant or `false` if the type is not defined |
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* |
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* @throws UnsupportedTypeException|\InvalidArgumentException |
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*/ |
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private function IANA2PHP(int $type): int |
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{ |
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$constantName = 'DNS_'.RecordTypeEnum::getName($type); |
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if (!defined($constantName)) { |
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throw new UnsupportedTypeException(sprintf('Record type "%d" is not a supported type.', $type)); |
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} |
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$phpType = constant($constantName); |
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if (!is_int($phpType)) { |
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throw new \InvalidArgumentException(sprintf('Constant "%s" is not an integer.', $constantName)); |
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} |
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return $phpType; |
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} |
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} |
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samuelwilliams /
PHP-DNS-SERVER
