1: <?php
  2: 
  3: /*
  4:  * This file is part of the Symfony package.
  5:  *
  6:  * (c) Fabien Potencier <fabien@symfony.com>
  7:  *
  8:  * For the full copyright and license information, please view the LICENSE
  9:  * file that was distributed with this source code.
 10:  */
 11: 
 12: namespace Symfony\Component\HttpFoundation;
 13: 
 14: /**
 15:  * Http utility functions.
 16:  *
 17:  * @author Fabien Potencier <fabien@symfony.com>
 18:  */
 19: class IpUtils
 20: {
 21:     /**
 22:      * This class should not be instantiated.
 23:      */
 24:     private function __construct()
 25:     {
 26:     }
 27: 
 28:     /**
 29:      * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
 30:      *
 31:      * @param string       $requestIp IP to check
 32:      * @param string|array $ips       List of IPs or subnets (can be a string if only a single one)
 33:      *
 34:      * @return bool Whether the IP is valid
 35:      */
 36:     public static function checkIp($requestIp, $ips)
 37:     {
 38:         if (!is_array($ips)) {
 39:             $ips = array($ips);
 40:         }
 41: 
 42:         $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
 43: 
 44:         foreach ($ips as $ip) {
 45:             if (self::$method($requestIp, $ip)) {
 46:                 return true;
 47:             }
 48:         }
 49: 
 50:         return false;
 51:     }
 52: 
 53:     /**
 54:      * Compares two IPv4 addresses.
 55:      * In case a subnet is given, it checks if it contains the request IP.
 56:      *
 57:      * @param string $requestIp IPv4 address to check
 58:      * @param string $ip        IPv4 address or subnet in CIDR notation
 59:      *
 60:      * @return bool Whether the IP is valid
 61:      */
 62:     public static function checkIp4($requestIp, $ip)
 63:     {
 64:         if (false !== strpos($ip, '/')) {
 65:             list($address, $netmask) = explode('/', $ip, 2);
 66: 
 67:             if ($netmask < 1 || $netmask > 32) {
 68:                 return false;
 69:             }
 70:         } else {
 71:             $address = $ip;
 72:             $netmask = 32;
 73:         }
 74: 
 75:         return 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
 76:     }
 77: 
 78:     /**
 79:      * Compares two IPv6 addresses.
 80:      * In case a subnet is given, it checks if it contains the request IP.
 81:      *
 82:      * @author David Soria Parra <dsp at php dot net>
 83:      *
 84:      * @see https://github.com/dsp/v6tools
 85:      *
 86:      * @param string $requestIp IPv6 address to check
 87:      * @param string $ip        IPv6 address or subnet in CIDR notation
 88:      *
 89:      * @return bool Whether the IP is valid
 90:      *
 91:      * @throws \RuntimeException When IPV6 support is not enabled
 92:      */
 93:     public static function checkIp6($requestIp, $ip)
 94:     {
 95:         if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) {
 96:             throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
 97:         }
 98: 
 99:         if (false !== strpos($ip, '/')) {
100:             list($address, $netmask) = explode('/', $ip, 2);
101: 
102:             if ($netmask < 1 || $netmask > 128) {
103:                 return false;
104:             }
105:         } else {
106:             $address = $ip;
107:             $netmask = 128;
108:         }
109: 
110:         $bytesAddr = unpack("n*", inet_pton($address));
111:         $bytesTest = unpack("n*", inet_pton($requestIp));
112: 
113:         for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; $i++) {
114:             $left = $netmask - 16 * ($i-1);
115:             $left = ($left <= 16) ? $left : 16;
116:             $mask = ~(0xffff >> $left) & 0xffff;
117:             if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
118:                 return false;
119:             }
120:         }
121: 
122:         return true;
123:     }
124: }
125: