Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\HttpFoundation;
Chris@0: 
Chris@0: /**
Chris@0:  * Http utility functions.
Chris@0:  *
Chris@0:  * @author Fabien Potencier <fabien@symfony.com>
Chris@0:  */
Chris@0: class IpUtils
Chris@0: {
Chris@17:     private static $checkedIps = [];
Chris@12: 
Chris@0:     /**
Chris@0:      * This class should not be instantiated.
Chris@0:      */
Chris@0:     private function __construct()
Chris@0:     {
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
Chris@0:      *
Chris@0:      * @param string       $requestIp IP to check
Chris@0:      * @param string|array $ips       List of IPs or subnets (can be a string if only a single one)
Chris@0:      *
Chris@0:      * @return bool Whether the IP is valid
Chris@0:      */
Chris@0:     public static function checkIp($requestIp, $ips)
Chris@0:     {
Chris@17:         if (!\is_array($ips)) {
Chris@17:             $ips = [$ips];
Chris@0:         }
Chris@0: 
Chris@0:         $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
Chris@0: 
Chris@0:         foreach ($ips as $ip) {
Chris@0:             if (self::$method($requestIp, $ip)) {
Chris@0:                 return true;
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         return false;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Compares two IPv4 addresses.
Chris@0:      * In case a subnet is given, it checks if it contains the request IP.
Chris@0:      *
Chris@0:      * @param string $requestIp IPv4 address to check
Chris@0:      * @param string $ip        IPv4 address or subnet in CIDR notation
Chris@0:      *
Chris@0:      * @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet
Chris@0:      */
Chris@0:     public static function checkIp4($requestIp, $ip)
Chris@0:     {
Chris@12:         $cacheKey = $requestIp.'-'.$ip;
Chris@12:         if (isset(self::$checkedIps[$cacheKey])) {
Chris@12:             return self::$checkedIps[$cacheKey];
Chris@12:         }
Chris@12: 
Chris@0:         if (!filter_var($requestIp, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
Chris@12:             return self::$checkedIps[$cacheKey] = false;
Chris@0:         }
Chris@0: 
Chris@0:         if (false !== strpos($ip, '/')) {
Chris@0:             list($address, $netmask) = explode('/', $ip, 2);
Chris@0: 
Chris@14:             if ('0' === $netmask) {
Chris@12:                 return self::$checkedIps[$cacheKey] = filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
Chris@0:             }
Chris@0: 
Chris@0:             if ($netmask < 0 || $netmask > 32) {
Chris@12:                 return self::$checkedIps[$cacheKey] = false;
Chris@0:             }
Chris@0:         } else {
Chris@0:             $address = $ip;
Chris@0:             $netmask = 32;
Chris@0:         }
Chris@0: 
Chris@14:         if (false === ip2long($address)) {
Chris@14:             return self::$checkedIps[$cacheKey] = false;
Chris@14:         }
Chris@14: 
Chris@12:         return self::$checkedIps[$cacheKey] = 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * Compares two IPv6 addresses.
Chris@0:      * In case a subnet is given, it checks if it contains the request IP.
Chris@0:      *
Chris@0:      * @author David Soria Parra <dsp at php dot net>
Chris@0:      *
Chris@0:      * @see https://github.com/dsp/v6tools
Chris@0:      *
Chris@0:      * @param string $requestIp IPv6 address to check
Chris@0:      * @param string $ip        IPv6 address or subnet in CIDR notation
Chris@0:      *
Chris@0:      * @return bool Whether the IP is valid
Chris@0:      *
Chris@0:      * @throws \RuntimeException When IPV6 support is not enabled
Chris@0:      */
Chris@0:     public static function checkIp6($requestIp, $ip)
Chris@0:     {
Chris@12:         $cacheKey = $requestIp.'-'.$ip;
Chris@12:         if (isset(self::$checkedIps[$cacheKey])) {
Chris@12:             return self::$checkedIps[$cacheKey];
Chris@12:         }
Chris@12: 
Chris@17:         if (!((\extension_loaded('sockets') && \defined('AF_INET6')) || @inet_pton('::1'))) {
Chris@0:             throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
Chris@0:         }
Chris@0: 
Chris@0:         if (false !== strpos($ip, '/')) {
Chris@0:             list($address, $netmask) = explode('/', $ip, 2);
Chris@0: 
Chris@14:             if ('0' === $netmask) {
Chris@14:                 return (bool) unpack('n*', @inet_pton($address));
Chris@14:             }
Chris@14: 
Chris@0:             if ($netmask < 1 || $netmask > 128) {
Chris@12:                 return self::$checkedIps[$cacheKey] = false;
Chris@0:             }
Chris@0:         } else {
Chris@0:             $address = $ip;
Chris@0:             $netmask = 128;
Chris@0:         }
Chris@0: 
Chris@0:         $bytesAddr = unpack('n*', @inet_pton($address));
Chris@0:         $bytesTest = unpack('n*', @inet_pton($requestIp));
Chris@0: 
Chris@0:         if (!$bytesAddr || !$bytesTest) {
Chris@12:             return self::$checkedIps[$cacheKey] = false;
Chris@0:         }
Chris@0: 
Chris@0:         for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
Chris@0:             $left = $netmask - 16 * ($i - 1);
Chris@0:             $left = ($left <= 16) ? $left : 16;
Chris@0:             $mask = ~(0xffff >> $left) & 0xffff;
Chris@0:             if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
Chris@12:                 return self::$checkedIps[$cacheKey] = false;
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@12:         return self::$checkedIps[$cacheKey] = true;
Chris@0:     }
Chris@0: }