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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\Parser\Tokens; |
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class NSEC implements RdataInterface |
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{ |
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use RdataTrait; |
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const TYPE = 'NSEC'; |
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const TYPE_CODE = 47; |
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/** |
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* The Next Domain field contains the next owner name (in the canonical |
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* ordering of the zone) that has authoritative data or contains a |
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* delegation point NS RR set. |
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* {@link https://tools.ietf.org/html/rfc4034#section-4.1.1}. |
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* |
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* @var string |
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*/ |
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private $nextDomainName; |
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/** |
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* @var array |
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*/ |
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private $types = []; |
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/** |
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* @return string |
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*/ |
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public function getNextDomainName(): string |
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{ |
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return $this->nextDomainName; |
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} |
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/** |
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* @param string $nextDomainName |
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*/ |
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public function setNextDomainName(string $nextDomainName): void |
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{ |
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$this->nextDomainName = $nextDomainName; |
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} |
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/** |
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* @param string $type |
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*/ |
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public function addType(string $type): void |
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{ |
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$this->types[] = $type; |
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} |
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/** |
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* Clears the types from the RDATA. |
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*/ |
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public function clearTypes(): void |
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{ |
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$this->types = []; |
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} |
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/** |
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* @return array |
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*/ |
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public function getTypes(): array |
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{ |
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return $this->types; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toText(): string |
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{ |
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return sprintf( |
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'%s %s', |
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$this->nextDomainName, |
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implode(' ', $this->types) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public function toWire(): string |
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{ |
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return self::encodeName($this->nextDomainName).self::renderBitmap($this->types); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function fromText(string $text): RdataInterface |
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{ |
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$iterator = new \ArrayIterator(explode(Tokens::SPACE, $text)); |
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$nsec = new self(); |
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$nsec->setNextDomainName($iterator->current()); |
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$iterator->next(); |
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while ($iterator->valid()) { |
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$nsec->addType($iterator->current()); |
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$iterator->next(); |
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} |
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return $nsec; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public static function fromWire(string $rdata): RdataInterface |
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{ |
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$nsec = new self(); |
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$offset = 0; |
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$nsec->setNextDomainName(self::decodeName($rdata, $offset)); |
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$types = self::parseBitmap($rdata, $offset); |
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array_map([$nsec, 'addType'], $types); |
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return $nsec; |
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} |
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/** |
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* @param string $rdata |
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* @param int $offset |
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* |
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* @return string[] |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public static function parseBitmap(string $rdata, int &$offset): array |
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{ |
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$bytes = unpack('C*', $rdata, $offset); |
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$types = []; |
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while (count($bytes) > 0) { |
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$mask = ''; |
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$window = array_shift($bytes); |
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$len = array_shift($bytes); |
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for ($i = 0; $i < $len; ++$i) { |
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$mask .= str_pad(decbin(array_shift($bytes)), 8, '0', STR_PAD_LEFT); |
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} |
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$offset = 0; |
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while (false !== $pos = strpos($mask, '1', $offset)) { |
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$types[] = TypeCodes::getName((int) $window * 256 + $pos); |
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$offset = $pos + 1; |
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} |
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} |
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return $types; |
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} |
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/** |
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* @param string[] $types |
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* |
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* @return string |
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* |
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* @throws UnsupportedTypeException |
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*/ |
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public static function renderBitmap(array $types): string |
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{ |
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$blocks = []; |
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foreach ($types as $type) { |
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$int = TypeCodes::getTypeCode($type); |
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$window = $int >> 8; |
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$int = $int & 0b11111111; |
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$mod = $int % 8; |
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$mask = $blocks[$window] ?? str_repeat("\0", 32); |
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$byteNum = ($int - $mod) / 8; |
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$byte = ord($mask[$byteNum]) | (128 >> $mod); |
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$mask[$byteNum] = chr($byte); |
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$blocks[$window] = $mask; |
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} |
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$encoded = ''; |
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foreach ($blocks as $n => $mask) { |
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$mask = rtrim($mask, "\0"); |
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$encoded .= chr($n).chr(strlen($mask)).$mask; |
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} |
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return $encoded; |
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} |
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} |
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Badcow /
DNS
