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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\Validator; |
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/** |
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* @see https://tools.ietf.org/html/rfc1035#section-3.3.12 |
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*/ |
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class PTR extends CNAME |
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{ |
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const TYPE = 'PTR'; |
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const TYPE_CODE = 12; |
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/** |
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* Expands an IPv6 address to its full, non-shorthand representation. |
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* |
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* E.g. 2001:db8:9a::42 -> 2001:0db8:009a:0000:0000:0000:0000:0042 |
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* |
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* @param string $ip IPv6 address |
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* |
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* @throws \InvalidArgumentException |
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*/ |
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public static function expandIpv6(string $ip): string |
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{ |
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if (!Validator::ipv6($ip)) { |
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throw new \InvalidArgumentException(sprintf('"%s" is not a valid IPv6 address.', $ip)); |
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} |
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if (false === $packed = inet_pton($ip)) { |
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throw new \InvalidArgumentException(sprintf('"%s" is not a valid IPv6 address.', $ip)); |
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} |
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$hex = unpack('H*hex', $packed); |
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return implode(':', str_split($hex['hex'], 4)); |
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} |
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/** |
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* This function will expand in incomplete IPv6 address. |
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* An incomplete IPv6 address is of the form `2001:db8:ff:abcd` |
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* i.e. one where there is less than eight hextets. |
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* |
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* @param string $ip IPv6 address |
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* |
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* @return string Expanded incomplete IPv6 address |
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*/ |
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public static function expandIncompleteIpv6(string $ip): string |
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{ |
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$hextets = array_map(function ($hextet) { |
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return str_pad($hextet, 4, '0', STR_PAD_LEFT); |
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}, explode(':', $ip)); |
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return implode(':', $hextets); |
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} |
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/** |
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* Takes a valid IPv6 address and contracts it |
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* to its shorter version. |
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* |
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* E.g.: 2001:0000:0000:acad:0000:0000:0000:0001 -> 2001:0:0:acad::1 |
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* |
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* Note: If there is more than one set of consecutive hextets, the function |
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* will favour the larger of the sets. If both sets of zeroes are the same |
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* the first will be favoured in the omission of zeroes. |
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* |
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* E.g.: 2001:0000:0000:ab80:2390:0000:0000:000a -> 2001:0:0:ab80:2390::a |
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* |
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* @param string $ip IPv6 address |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return string Contracted IPv6 address |
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*/ |
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public static function contractIpv6(string $ip): string |
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{ |
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$packed = inet_pton($ip); |
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if (!Validator::ipv6($ip) || false === $packed) { |
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throw new \InvalidArgumentException(sprintf('"%s" is not a valid IPv6 address.', $ip)); |
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} |
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$unpacked = inet_ntop($packed); |
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if (false === $unpacked) { |
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throw new \InvalidArgumentException(sprintf('"%s" could not be contracted.', $ip)); |
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} |
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return $unpacked; |
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} |
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/** |
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* Creates a reverse IPv4 address. |
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* |
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* E.g. 192.168.1.213 -> 213.1.168.192.in-addr.arpa. |
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* |
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* @param string $ip Valid IPv4 address |
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* |
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* @return string Reversed IP address appended with ".in-addr.arpa." |
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*/ |
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public static function reverseIpv4(string $ip): string |
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{ |
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$octets = array_reverse(explode('.', $ip)); |
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return implode('.', $octets).'.in-addr.arpa.'; |
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} |
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/** |
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* Creates a reverse IPv6 address. |
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* |
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* E.g. 2001:db8::567:89ab -> b.a.9.8.7.6.5.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa. |
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* |
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* @param string $ip A full or partial IPv6 address |
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* @param bool $appendSuffix Whether or not to append ".ip6.arpa.' suffix. |
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* |
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* @return string The reversed address appended with ".ip6.arpa." |
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*/ |
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public static function reverseIpv6(string $ip, bool $appendSuffix = true): string |
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{ |
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try { |
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$ip = self::expandIpv6($ip); |
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} catch (\InvalidArgumentException $e) { |
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$ip = self::expandIncompleteIpv6($ip); |
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} |
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$ip = str_replace(':', '', $ip); |
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$ip = strrev($ip); |
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$ip = implode('.', str_split($ip)); |
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$ip .= $appendSuffix ? '.ip6.arpa.' : ''; |
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return $ip; |
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} |
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} |
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Badcow /
DNS
