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<?php |
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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\Ip; |
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use Badcow\DNS\Validator; |
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class Toolbox |
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{ |
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/** |
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* Expands an IPv6 address to its full, non-short hand representation. |
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* |
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* @param string $ip IPv6 address |
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* @throws \InvalidArgumentException |
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* |
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* @return string |
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*/ |
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public static function expandIpv6($ip) |
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{ |
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if (!Validator::validateIpv6Address($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', inet_pton($ip)); |
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$ip = substr(preg_replace('/([A-f0-9]{4})/', '$1:', $hex['hex']), 0, -1); |
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return $ip; |
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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:ffff: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 $ip IPv6 address |
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* @return string Expanded incomplete IPv6 address |
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*/ |
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public static function expandIncompleteIpv6($ip) |
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{ |
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$parts = explode(':', $ip); |
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foreach ($parts as $i => $part) { |
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$parts[$i] = str_pad($part, 4, '0', STR_PAD_LEFT); |
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} |
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return implode(':', $parts); |
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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 second 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 $ip IPv6 address |
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* @throws \InvalidArgumentException |
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* |
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* @return string Contracted IPv6 address |
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*/ |
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public static function contractIpv6($ip) |
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{ |
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if (!Validator::validateIpv6Address($ip)) { |
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throw new \InvalidArgumentException(sprintf('"%s" is not a valid IPv6 address.', $ip)); |
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} |
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$ip = self::expandIpv6($ip); |
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$hextets = explode(':', $ip); |
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$decimals = []; |
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foreach ($hextets as $hextet) { |
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$decimals[] = hexdec($hextet); |
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} |
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$zeroes = []; |
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$flag = false; |
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foreach ($decimals as $i => $n) { |
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if (0 === $n) { |
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if (true === $flag) { |
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$arg = end($zeroes); |
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$arg['n'] += 1; |
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} else { |
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$flag = true; |
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$arg = ['i' => $i, 'n' => 1]; |
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} |
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$zeroes[$arg['i']] = $arg; |
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continue; |
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} |
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$flag = false; |
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} |
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$i_0 = -1; |
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$n_0 = 0; |
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if (count($zeroes) > 0) { |
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$n = 0; |
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foreach ($zeroes as $arg) { |
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if ($arg['n'] >= $n) { |
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$i_0 = $arg['i']; |
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$n_0 = $arg['n']; |
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} |
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} |
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} |
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$ip = ''; |
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foreach ($decimals as $i => $decimal) { |
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if ($i > $i_0 && $i < $i_0 + $n_0) { |
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continue; |
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} |
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if ($i === $i_0) { |
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$ip .= '::'; |
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continue; |
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} |
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$ip .= (string) dechex($decimal); |
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$ip .= ($i < 7) ? ':' : ''; |
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} |
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return preg_replace('/\:{3}/', '::', $ip); |
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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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* @param $ip |
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* |
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* @return string |
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*/ |
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public static function reverseIpv4($ip) |
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{ |
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$parts = array_reverse(explode('.', $ip)); |
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$address = implode('.', $parts); |
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$address .= '.in-addr.arpa.'; |
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return $address; |
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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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* @param string $ip |
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* |
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* @return string |
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*/ |
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public static function reverseIpv6($ip) |
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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($ip); |
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$address = implode('.', str_split($ip)); |
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$address .= '.ip6.arpa.'; |
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return $address; |
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} |
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} |
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Badcow /
DNS
