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Edit File : IPv6.php \| Size : 7.21 KB
<?php // SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue // SPDX-License-Identifier: BSD-3-Clause declare(strict_types=1); namespace SimplePie\Net; /** * Class to validate and to work with IPv6 addresses. * * @copyright 2003-2005 The PHP Group * @license http://www.opensource.org/licenses/bsd-license.php * @link http://pear.php.net/package/Net_IPv6 * @author Alexander Merz <alexander.merz@web.de> * @author elfrink at introweb dot nl * @author Josh Peck <jmp at joshpeck dot org> * @author Sam Sneddon <geoffers@gmail.com> / class IPv6 { /* * Uncompresses an IPv6 address * * RFC 4291 allows you to compress consecutive zero pieces in an address to * '::'. This method expects a valid IPv6 address and expands the '::' to * the required number of zero pieces. * * Example: FF01::101 -> FF01:0:0:0:0:0:0:101 * ::1 -> 0:0:0:0:0:0:0:1 * * @author Alexander Merz <alexander.merz@web.de> * @author elfrink at introweb dot nl * @author Josh Peck <jmp at joshpeck dot org> * @copyright 2003-2005 The PHP Group * @license http://www.opensource.org/licenses/bsd-license.php * @param string $ip An IPv6 address * @return string The uncompressed IPv6 address / public static function uncompress(string $ip) { $c1 = -1; $c2 = -1; if (substr_count($ip, '::') === 1) { [$ip1, $ip2] = explode('::', $ip); if ($ip1 === '') { $c1 = -1; } else { $c1 = substr_count($ip1, ':'); } if ($ip2 === '') { $c2 = -1; } else { $c2 = substr_count($ip2, ':'); } if (strpos($ip2, '.') !== false) { $c2++; } // :: if ($c1 === -1 && $c2 === -1) { $ip = '0:0:0:0:0:0:0:0'; } // ::xxx elseif ($c1 === -1) { $fill = str_repeat('0:', 7 - $c2); $ip = str_replace('::', $fill, $ip); } // xxx:: elseif ($c2 === -1) { $fill = str_repeat(':0', 7 - $c1); $ip = str_replace('::', $fill, $ip); } // xxx::xxx else { $fill = ':' . str_repeat('0:', 6 - $c2 - $c1); $ip = str_replace('::', $fill, $ip); } } return $ip; } /* * Compresses an IPv6 address * * RFC 4291 allows you to compress consecutive zero pieces in an address to * '::'. This method expects a valid IPv6 address and compresses consecutive * zero pieces to '::'. * * Example: FF01:0:0:0:0:0:0:101 -> FF01::101 * 0:0:0:0:0:0:0:1 -> ::1 * * @see uncompress() * @param string $ip An IPv6 address * @return string The compressed IPv6 address / public static function compress(string $ip) { // Prepare the IP to be compressed $ip = self::uncompress($ip); $ip_parts = self::split_v6_v4($ip); // Replace all leading zeros $ip_parts[0] = (string) preg_replace('/(^\|:)0+([0-9])/', '\1\2', $ip_parts[0]); // Find bunches of zeros if (preg_match_all('/(?:^\|:)(?:0(?::\|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) { $max = 0; $pos = null; foreach ($matches[0] as $match) { if (strlen($match[0]) > $max) { $max = strlen($match[0]); $pos = $match[1]; } } assert($pos !== null, 'For PHPStan: Since the regex matched, there is at least one match. And because the pattern is non-empty, the loop will always end with $pos ≥ 1.'); $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max); } if ($ip_parts[1] !== '') { return implode(':', $ip_parts); } return $ip_parts[0]; } /* * Splits an IPv6 address into the IPv6 and IPv4 representation parts * * RFC 4291 allows you to represent the last two parts of an IPv6 address * using the standard IPv4 representation * * Example: 0:0:0:0:0:0:13.1.68.3 * 0:0:0:0:0:FFFF:129.144.52.38 * * @param string $ip An IPv6 address * @return array{string, string} [0] contains the IPv6 represented part, and [1] the IPv4 represented part / private static function split_v6_v4(string $ip): array { if (strpos($ip, '.') !== false) { $pos = strrpos($ip, ':'); assert($pos !== false, 'For PHPStan: IPv6 address must contain colon, since split_v6_v4 is only ever called after uncompress.'); $ipv6_part = substr($ip, 0, $pos); $ipv4_part = substr($ip, $pos + 1); return [$ipv6_part, $ipv4_part]; } return [$ip, '']; } /* * Checks an IPv6 address * * Checks if the given IP is a valid IPv6 address * * @param string $ip An IPv6 address * @return bool true if $ip is a valid IPv6 address / public static function check_ipv6(string $ip) { $ip = self::uncompress($ip); [$ipv6, $ipv4] = self::split_v6_v4($ip); $ipv6 = explode(':', $ipv6); $ipv4 = explode('.', $ipv4); if (count($ipv6) === 8 && count($ipv4) === 1 \|\| count($ipv6) === 6 && count($ipv4) === 4) { foreach ($ipv6 as $ipv6_part) { // The section can't be empty if ($ipv6_part === '') { return false; } // Nor can it be over four characters if (strlen($ipv6_part) > 4) { return false; } // Remove leading zeros (this is safe because of the above) $ipv6_part = ltrim($ipv6_part, '0'); if ($ipv6_part === '') { $ipv6_part = '0'; } // Check the value is valid $value = hexdec($ipv6_part); if ($value < 0 \|\| $value > 0xFFFF) { return false; } assert(is_int($value), 'For PHPStan: $value is only float when $ipv6_part > PHP_INT_MAX'); if (dechex($value) !== strtolower($ipv6_part)) { return false; } } if (count($ipv4) === 4) { foreach ($ipv4 as $ipv4_part) { $value = (int) $ipv4_part; if ((string) $value !== $ipv4_part \|\| $value < 0 \|\| $value > 0xFF) { return false; } } } return true; } return false; } /* * Checks if the given IP is a valid IPv6 address * * @codeCoverageIgnore * @deprecated Use {@see IPv6::check_ipv6()} instead * @see check_ipv6 * @param string $ip An IPv6 address * @return bool true if $ip is a valid IPv6 address */ public static function checkIPv6(string $ip) { return self::check_ipv6($ip); } } class_alias('SimplePie\Net\IPv6', 'SimplePie_Net_IPv6'); Back

Edit File : IPv6.php | Size : 7.21 KB

<?php

// SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue
// SPDX-License-Identifier: BSD-3-Clause

declare(strict_types=1);

namespace SimplePie\Net;

/**
 * Class to validate and to work with IPv6 addresses.
 *
 * @copyright 2003-2005 The PHP Group
 * @license http://www.opensource.org/licenses/bsd-license.php
 * @link http://pear.php.net/package/Net_IPv6
 * @author Alexander Merz <alexander.merz@web.de>
 * @author elfrink at introweb dot nl
 * @author Josh Peck <jmp at joshpeck dot org>
 * @author Sam Sneddon <geoffers@gmail.com>
 */
class IPv6
{
    /**
     * Uncompresses an IPv6 address
     *
     * RFC 4291 allows you to compress consecutive zero pieces in an address to
     * '::'. This method expects a valid IPv6 address and expands the '::' to
     * the required number of zero pieces.
     *
     * Example:  FF01::101   ->  FF01:0:0:0:0:0:0:101
     *           ::1         ->  0:0:0:0:0:0:0:1
     *
     * @author Alexander Merz <alexander.merz@web.de>
     * @author elfrink at introweb dot nl
     * @author Josh Peck <jmp at joshpeck dot org>
     * @copyright 2003-2005 The PHP Group
     * @license http://www.opensource.org/licenses/bsd-license.php
     * @param string $ip An IPv6 address
     * @return string The uncompressed IPv6 address
     */
    public static function uncompress(string $ip)
    {
        $c1 = -1;
        $c2 = -1;
        if (substr_count($ip, '::') === 1) {
            [$ip1, $ip2] = explode('::', $ip);
            if ($ip1 === '') {
                $c1 = -1;
            } else {
                $c1 = substr_count($ip1, ':');
            }
            if ($ip2 === '') {
                $c2 = -1;
            } else {
                $c2 = substr_count($ip2, ':');
            }
            if (strpos($ip2, '.') !== false) {
                $c2++;
            }
            // ::
            if ($c1 === -1 && $c2 === -1) {
                $ip = '0:0:0:0:0:0:0:0';
            }
            // ::xxx
            elseif ($c1 === -1) {
                $fill = str_repeat('0:', 7 - $c2);
                $ip = str_replace('::', $fill, $ip);
            }
            // xxx::
            elseif ($c2 === -1) {
                $fill = str_repeat(':0', 7 - $c1);
                $ip = str_replace('::', $fill, $ip);
            }
            // xxx::xxx
            else {
                $fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
                $ip = str_replace('::', $fill, $ip);
            }
        }
        return $ip;
    }

/**
     * Compresses an IPv6 address
     *
     * RFC 4291 allows you to compress consecutive zero pieces in an address to
     * '::'. This method expects a valid IPv6 address and compresses consecutive
     * zero pieces to '::'.
     *
     * Example:  FF01:0:0:0:0:0:0:101   ->  FF01::101
     *           0:0:0:0:0:0:0:1        ->  ::1
     *
     * @see uncompress()
     * @param string $ip An IPv6 address
     * @return string The compressed IPv6 address
     */
    public static function compress(string $ip)
    {
        // Prepare the IP to be compressed
        $ip = self::uncompress($ip);
        $ip_parts = self::split_v6_v4($ip);

// Replace all leading zeros
        $ip_parts[0] = (string) preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);

// Find bunches of zeros
        if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) {
            $max = 0;
            $pos = null;
            foreach ($matches[0] as $match) {
                if (strlen($match[0]) > $max) {
                    $max = strlen($match[0]);
                    $pos = $match[1];
                }
            }

assert($pos !== null, 'For PHPStan: Since the regex matched, there is at least one match. And because the pattern is non-empty, the loop will always end with $pos ≥ 1.');
            $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max);
        }

if ($ip_parts[1] !== '') {
            return implode(':', $ip_parts);
        }

return $ip_parts[0];
    }

/**
     * Splits an IPv6 address into the IPv6 and IPv4 representation parts
     *
     * RFC 4291 allows you to represent the last two parts of an IPv6 address
     * using the standard IPv4 representation
     *
     * Example:  0:0:0:0:0:0:13.1.68.3
     *           0:0:0:0:0:FFFF:129.144.52.38
     *
     * @param string $ip An IPv6 address
     * @return array{string, string} [0] contains the IPv6 represented part, and [1] the IPv4 represented part
     */
    private static function split_v6_v4(string $ip): array
    {
        if (strpos($ip, '.') !== false) {
            $pos = strrpos($ip, ':');
            assert($pos !== false, 'For PHPStan: IPv6 address must contain colon, since split_v6_v4 is only ever called after uncompress.');
            $ipv6_part = substr($ip, 0, $pos);
            $ipv4_part = substr($ip, $pos + 1);
            return [$ipv6_part, $ipv4_part];
        }

return [$ip, ''];
    }

/**
     * Checks an IPv6 address
     *
     * Checks if the given IP is a valid IPv6 address
     *
     * @param string $ip An IPv6 address
     * @return bool true if $ip is a valid IPv6 address
     */
    public static function check_ipv6(string $ip)
    {
        $ip = self::uncompress($ip);
        [$ipv6, $ipv4] = self::split_v6_v4($ip);
        $ipv6 = explode(':', $ipv6);
        $ipv4 = explode('.', $ipv4);
        if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) {
            foreach ($ipv6 as $ipv6_part) {
                // The section can't be empty
                if ($ipv6_part === '') {
                    return false;
                }

// Nor can it be over four characters
                if (strlen($ipv6_part) > 4) {
                    return false;
                }

// Remove leading zeros (this is safe because of the above)
                $ipv6_part = ltrim($ipv6_part, '0');
                if ($ipv6_part === '') {
                    $ipv6_part = '0';
                }

// Check the value is valid
                $value = hexdec($ipv6_part);
                if ($value < 0 || $value > 0xFFFF) {
                    return false;
                }
                assert(is_int($value), 'For PHPStan: $value is only float when $ipv6_part > PHP_INT_MAX');
                if (dechex($value) !== strtolower($ipv6_part)) {
                    return false;
                }
            }
            if (count($ipv4) === 4) {
                foreach ($ipv4 as $ipv4_part) {
                    $value = (int) $ipv4_part;
                    if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) {
                        return false;
                    }
                }
            }
            return true;
        }

return false;
    }

/**
     * Checks if the given IP is a valid IPv6 address
     *
     * @codeCoverageIgnore
     * @deprecated Use {@see IPv6::check_ipv6()} instead
     * @see check_ipv6
     * @param string $ip An IPv6 address
     * @return bool true if $ip is a valid IPv6 address
     */
    public static function checkIPv6(string $ip)
    {
        return self::check_ipv6($ip);
    }
}

class_alias('SimplePie\Net\IPv6', 'SimplePie_Net_IPv6');

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