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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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use Badcow\DNS\Validator; |
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/** |
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* Class CaaRdata. |
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* |
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* CAA is defined in RFC 6844 |
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* |
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* @see https://tools.ietf.org/html/rfc6844 |
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* |
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* @author Samuel Williams <[email protected]> |
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*/ |
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class CAA implements RdataInterface |
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{ |
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use RdataTrait; |
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const TYPE = 'CAA'; |
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const TYPE_CODE = 257; |
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const TAG_ISSUE = 'issue'; |
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const TAG_ISSUEWILD = 'issuewild'; |
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const TAG_IODEF = 'iodef'; |
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const ALLOWED_TAGS = [self::TAG_ISSUE, self::TAG_ISSUEWILD, self::TAG_IODEF]; |
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/** |
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* It is currently used to represent the critical flag. |
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* |
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* @var int |
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*/ |
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private $flag; |
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/** |
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* An ASCII string that represents the identifier of the property represented by the record. |
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* The RFC currently defines 3 available tags: |
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* - issue: explicitly authorizes a single certificate authority to issue a certificate (any type) for the hostname. |
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* - issuewild: explicitly authorizes a single certificate authority to issue a wildcard certificate (and only wildcard) for the hostname. |
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* - iodef: specifies a URL to which a certificate authority may report policy violations. |
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* |
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* @var string |
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*/ |
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private $tag; |
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/** |
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* @var string |
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*/ |
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private $value; |
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/** |
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* @return int |
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*/ |
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public function getFlag(): ?int |
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{ |
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return $this->flag; |
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} |
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/** |
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* @throws \InvalidArgumentException |
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*/ |
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public function setFlag(int $flag): void |
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{ |
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if (!Validator::isUnsignedInteger($flag, 8)) { |
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throw new \InvalidArgumentException('Flag must be an unsigned 8-bit integer.'); |
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} |
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$this->flag = $flag; |
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} |
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/** |
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* @return string |
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*/ |
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public function getTag(): ?string |
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{ |
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return $this->tag; |
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} |
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/** |
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* @throws \InvalidArgumentException |
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*/ |
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public function setTag(string $tag): void |
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{ |
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$tag = strtolower($tag); |
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if (!in_array($tag, static::ALLOWED_TAGS)) { |
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throw new \InvalidArgumentException('Tag can be one of this type "issue", "issuewild", or "iodef".'); |
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} |
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$this->tag = $tag; |
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} |
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public function getValue(): ?string |
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{ |
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return $this->value; |
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} |
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public function setValue(string $value): void |
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{ |
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$this->value = $value; |
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} |
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public function toText(): string |
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{ |
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if (!isset($this->tag) || !isset($this->flag) || !isset($this->value)) { |
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throw new \InvalidArgumentException('All CAA parameters must be set.'); |
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} |
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return sprintf('%d %s "%s"', |
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$this->flag, |
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$this->tag ?? '', |
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$this->value ?? '' |
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); |
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} |
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public function toWire(): string |
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{ |
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if (!isset($this->tag) || !isset($this->flag) || !isset($this->value)) { |
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throw new \InvalidArgumentException('All CAA parameters must be set.'); |
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} |
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return chr($this->flag). |
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chr(strlen($this->tag)). |
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$this->tag. |
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$this->value; |
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} |
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public function fromWire(string $rdata, int &$offset = 0, ?int $rdLength = null): void |
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{ |
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$this->setFlag(ord($rdata[$offset])); |
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++$offset; |
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$tagLen = ord($rdata[$offset]); |
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++$offset; |
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$this->setTag(substr($rdata, $offset, $tagLen)); |
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$offset += $tagLen; |
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$valueLen = ($rdLength ?? strlen($rdata)) - 2 - $tagLen; |
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$this->setValue(substr($rdata, $offset, $valueLen)); |
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$offset = $offset += $valueLen; |
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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->setFlag((int) array_shift($rdata)); |
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$this->setTag((string) array_shift($rdata)); |
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$rdata = implode('', $rdata); |
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$this->setValue(trim($rdata, '"')); |
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} |
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} |
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Badcow /
DNS
