1: <?php
 2: 
 3: /**
 4:  * This file is part of the Nette Framework (https://nette.org)
 5:  * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
 6:  */
 7: 
 8: namespace Nette\Http;
 9: 
10: use Nette;
11: 
12: 
13: /**
14:  * Rendering helpers for HTTP.
15:  *
16:  * @author     David Grudl
17:  */
18: class Helpers
19: {
20: 
21:     /**
22:      * Is IP address in CIDR block?
23:      * @return bool
24:      */
25:     public static function ipMatch($ip, $mask)
26:     {
27:         list($mask, $size) = explode('/', $mask . '/');
28:         $tmp = function ($n) { return sprintf('%032b', $n); };
29:         $ip = implode('', array_map($tmp, unpack('N*', inet_pton($ip))));
30:         $mask = implode('', array_map($tmp, unpack('N*', inet_pton($mask))));
31:         $max = strlen($ip);
32:         if (!$max || $max !== strlen($mask) || $size < 0 || $size > $max) {
33:             return FALSE;
34:         }
35:         return strncmp($ip, $mask, $size === '' ? $max : $size) === 0;
36:     }
37: 
38: }
39: