4 * This file is part of the Symfony package.
6 * (c) Fabien Potencier <fabien@symfony.com>
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
12 namespace Symfony\Component\HttpFoundation;
15 * Http utility functions.
17 * @author Fabien Potencier <fabien@symfony.com>
21 private static $checkedIps = array();
24 * This class should not be instantiated.
26 private function __construct()
31 * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
33 * @param string $requestIp IP to check
34 * @param string|array $ips List of IPs or subnets (can be a string if only a single one)
36 * @return bool Whether the IP is valid
38 public static function checkIp($requestIp, $ips)
40 if (!\is_array($ips)) {
44 $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
46 foreach ($ips as $ip) {
47 if (self::$method($requestIp, $ip)) {
56 * Compares two IPv4 addresses.
57 * In case a subnet is given, it checks if it contains the request IP.
59 * @param string $requestIp IPv4 address to check
60 * @param string $ip IPv4 address or subnet in CIDR notation
62 * @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet
64 public static function checkIp4($requestIp, $ip)
66 $cacheKey = $requestIp.'-'.$ip;
67 if (isset(self::$checkedIps[$cacheKey])) {
68 return self::$checkedIps[$cacheKey];
71 if (!filter_var($requestIp, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
72 return self::$checkedIps[$cacheKey] = false;
75 if (false !== strpos($ip, '/')) {
76 list($address, $netmask) = explode('/', $ip, 2);
78 if ('0' === $netmask) {
79 return self::$checkedIps[$cacheKey] = filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
82 if ($netmask < 0 || $netmask > 32) {
83 return self::$checkedIps[$cacheKey] = false;
90 if (false === ip2long($address)) {
91 return self::$checkedIps[$cacheKey] = false;
94 return self::$checkedIps[$cacheKey] = 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
98 * Compares two IPv6 addresses.
99 * In case a subnet is given, it checks if it contains the request IP.
101 * @author David Soria Parra <dsp at php dot net>
103 * @see https://github.com/dsp/v6tools
105 * @param string $requestIp IPv6 address to check
106 * @param string $ip IPv6 address or subnet in CIDR notation
108 * @return bool Whether the IP is valid
110 * @throws \RuntimeException When IPV6 support is not enabled
112 public static function checkIp6($requestIp, $ip)
114 $cacheKey = $requestIp.'-'.$ip;
115 if (isset(self::$checkedIps[$cacheKey])) {
116 return self::$checkedIps[$cacheKey];
119 if (!((\extension_loaded('sockets') && \defined('AF_INET6')) || @inet_pton('::1'))) {
120 throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
123 if (false !== strpos($ip, '/')) {
124 list($address, $netmask) = explode('/', $ip, 2);
126 if ('0' === $netmask) {
127 return (bool) unpack('n*', @inet_pton($address));
130 if ($netmask < 1 || $netmask > 128) {
131 return self::$checkedIps[$cacheKey] = false;
138 $bytesAddr = unpack('n*', @inet_pton($address));
139 $bytesTest = unpack('n*', @inet_pton($requestIp));
141 if (!$bytesAddr || !$bytesTest) {
142 return self::$checkedIps[$cacheKey] = false;
145 for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
146 $left = $netmask - 16 * ($i - 1);
147 $left = ($left <= 16) ? $left : 16;
148 $mask = ~(0xffff >> $left) & 0xffff;
149 if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
150 return self::$checkedIps[$cacheKey] = false;
154 return self::$checkedIps[$cacheKey] = true;