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- 27.10.2014
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IpUtils.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation;
013
014 /**
015 * Http utility functions.
016 *
017 * @author Fabien Potencier <fabien@symfony.com>
018 */
019 class IpUtils
020 {
021 /**
022 * This class should not be instantiated
023 */
024 private function __construct()
025 {
026 }
027
028 /**
029 * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets
030 *
031 * @param string $requestIp IP to check
032 * @param string|array $ips List of IPs or subnets (can be a string if only a single one)
033 *
034 * @return bool Whether the IP is valid
035 */
036 public static function checkIp($requestIp, $ips)
037 {
038 if (!is_array($ips)) {
039 $ips = array($ips);
040 }
041
042 $method = false !== strpos($requestIp, ':') ? 'checkIp6' : 'checkIp4';
043
044 foreach ($ips as $ip) {
045 if (self::$method($requestIp, $ip)) {
046 return true;
047 }
048 }
049
050 return false;
051 }
052
053 /**
054 * Compares two IPv4 addresses.
055 * In case a subnet is given, it checks if it contains the request IP.
056 *
057 * @param string $requestIp IPv4 address to check
058 * @param string $ip IPv4 address or subnet in CIDR notation
059 *
060 * @return bool Whether the IP is valid
061 */
062 public static function checkIp4($requestIp, $ip)
063 {
064 if (false !== strpos($ip, '/')) {
065 list($address, $netmask) = explode('/', $ip, 2);
066
067 if ($netmask < 1 || $netmask > 32) {
068 return false;
069 }
070 } else {
071 $address = $ip;
072 $netmask = 32;
073 }
074
075 return 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
076 }
077
078 /**
079 * Compares two IPv6 addresses.
080 * In case a subnet is given, it checks if it contains the request IP.
081 *
082 * @author David Soria Parra <dsp at php dot net>
083 * @see https://github.com/dsp/v6tools
084 *
085 * @param string $requestIp IPv6 address to check
086 * @param string $ip IPv6 address or subnet in CIDR notation
087 *
088 * @return bool Whether the IP is valid
089 *
090 * @throws \RuntimeException When IPV6 support is not enabled
091 */
092 public static function checkIp6($requestIp, $ip)
093 {
094 if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) {
095 throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
096 }
097
098 if (false !== strpos($ip, '/')) {
099 list($address, $netmask) = explode('/', $ip, 2);
100
101 if ($netmask < 1 || $netmask > 128) {
102 return false;
103 }
104 } else {
105 $address = $ip;
106 $netmask = 128;
107 }
108
109 $bytesAddr = unpack("n*", inet_pton($address));
110 $bytesTest = unpack("n*", inet_pton($requestIp));
111
112 for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; $i++) {
113 $left = $netmask - 16 * ($i-1);
114 $left = ($left <= 16) ? $left : 16;
115 $mask = ~(0xffff >> $left) & 0xffff;
116 if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
117 return false;
118 }
119 }
120
121 return true;
122 }
123 }
124