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