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   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      private static $checkedIps = [];
  22  
  23      /**
  24       * This class should not be instantiated.
  25       */
  26      private function __construct()
  27      {
  28      }
  29  
  30      /**
  31       * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
  32       *
  33       * @param string       $requestIp IP to check
  34       * @param string|array $ips       List of IPs or subnets (can be a string if only a single one)
  35       *
  36       * @return bool Whether the IP is valid
  37       */
  38      public static function checkIp($requestIp, $ips)
  39      {
  40          if (!\is_array($ips)) {
  41              $ips = [$ips];
  42          }
  43  
  44          $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
  45  
  46          foreach ($ips as $ip) {
  47              if (self::$method($requestIp, $ip)) {
  48                  return true;
  49              }
  50          }
  51  
  52          return false;
  53      }
  54  
  55      /**
  56       * Compares two IPv4 addresses.
  57       * In case a subnet is given, it checks if it contains the request IP.
  58       *
  59       * @param string $requestIp IPv4 address to check
  60       * @param string $ip        IPv4 address or subnet in CIDR notation
  61       *
  62       * @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet
  63       */
  64      public static function checkIp4($requestIp, $ip)
  65      {
  66          $cacheKey = $requestIp.'-'.$ip;
  67          if (isset(self::$checkedIps[$cacheKey])) {
  68              return self::$checkedIps[$cacheKey];
  69          }
  70  
  71          if (!filter_var($requestIp, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4)) {
  72              return self::$checkedIps[$cacheKey] = false;
  73          }
  74  
  75          if (false !== strpos($ip, '/')) {
  76              list($address, $netmask) = explode('/', $ip, 2);
  77  
  78              if ('0' === $netmask) {
  79                  return self::$checkedIps[$cacheKey] = filter_var($address, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
  80              }
  81  
  82              if ($netmask < 0 || $netmask > 32) {
  83                  return self::$checkedIps[$cacheKey] = false;
  84              }
  85          } else {
  86              $address = $ip;
  87              $netmask = 32;
  88          }
  89  
  90          if (false === ip2long($address)) {
  91              return self::$checkedIps[$cacheKey] = false;
  92          }
  93  
  94          return self::$checkedIps[$cacheKey] = 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
  95      }
  96  
  97      /**
  98       * Compares two IPv6 addresses.
  99       * In case a subnet is given, it checks if it contains the request IP.
 100       *
 101       * @author David Soria Parra <dsp at php dot net>
 102       *
 103       * @see https://github.com/dsp/v6tools
 104       *
 105       * @param string $requestIp IPv6 address to check
 106       * @param string $ip        IPv6 address or subnet in CIDR notation
 107       *
 108       * @return bool Whether the IP is valid
 109       *
 110       * @throws \RuntimeException When IPV6 support is not enabled
 111       */
 112      public static function checkIp6($requestIp, $ip)
 113      {
 114          $cacheKey = $requestIp.'-'.$ip;
 115          if (isset(self::$checkedIps[$cacheKey])) {
 116              return self::$checkedIps[$cacheKey];
 117          }
 118  
 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".');
 121          }
 122  
 123          if (false !== strpos($ip, '/')) {
 124              list($address, $netmask) = explode('/', $ip, 2);
 125  
 126              if ('0' === $netmask) {
 127                  return (bool) unpack('n*', @inet_pton($address));
 128              }
 129  
 130              if ($netmask < 1 || $netmask > 128) {
 131                  return self::$checkedIps[$cacheKey] = false;
 132              }
 133          } else {
 134              $address = $ip;
 135              $netmask = 128;
 136          }
 137  
 138          $bytesAddr = unpack('n*', @inet_pton($address));
 139          $bytesTest = unpack('n*', @inet_pton($requestIp));
 140  
 141          if (!$bytesAddr || !$bytesTest) {
 142              return self::$checkedIps[$cacheKey] = false;
 143          }
 144  
 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[$cacheKey] = false;
 151              }
 152          }
 153  
 154          return self::$checkedIps[$cacheKey] = true;
 155      }
 156  }