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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      /**
  22       * This class should not be instantiated.
  23       */
  24      private function __construct()
  25      {
  26      }
  27  
  28      /**
  29       * Checks if an IPv4 or IPv6 address is contained in the list of given IPs or subnets.
  30       *
  31       * @param string       $requestIp IP to check
  32       * @param string|array $ips       List of IPs or subnets (can be a string if only a single one)
  33       *
  34       * @return bool Whether the IP is valid
  35       */
  36      public static function checkIp($requestIp, $ips)
  37      {
  38          if (!is_array($ips)) {
  39              $ips = array($ips);
  40          }
  41  
  42          $method = substr_count($requestIp, ':') > 1 ? 'checkIp6' : 'checkIp4';
  43  
  44          foreach ($ips as $ip) {
  45              if (self::$method($requestIp, $ip)) {
  46                  return true;
  47              }
  48          }
  49  
  50          return false;
  51      }
  52  
  53      /**
  54       * Compares two IPv4 addresses.
  55       * In case a subnet is given, it checks if it contains the request IP.
  56       *
  57       * @param string $requestIp IPv4 address to check
  58       * @param string $ip        IPv4 address or subnet in CIDR notation
  59       *
  60       * @return bool Whether the request IP matches the IP, or whether the request IP is within the CIDR subnet.
  61       */
  62      public static function checkIp4($requestIp, $ip)
  63      {
  64          if (false !== strpos($ip, '/')) {
  65              list($address, $netmask) = explode('/', $ip, 2);
  66  
  67              if ($netmask === '0') {
  68                  // Ensure IP is valid - using ip2long below implicitly validates, but we need to do it manually here
  69                  return filter_var($address, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
  70              }
  71  
  72              if ($netmask < 0 || $netmask > 32) {
  73                  return false;
  74              }
  75          } else {
  76              $address = $ip;
  77              $netmask = 32;
  78          }
  79  
  80          return 0 === substr_compare(sprintf('%032b', ip2long($requestIp)), sprintf('%032b', ip2long($address)), 0, $netmask);
  81      }
  82  
  83      /**
  84       * Compares two IPv6 addresses.
  85       * In case a subnet is given, it checks if it contains the request IP.
  86       *
  87       * @author David Soria Parra <dsp at php dot net>
  88       *
  89       * @see https://github.com/dsp/v6tools
  90       *
  91       * @param string $requestIp IPv6 address to check
  92       * @param string $ip        IPv6 address or subnet in CIDR notation
  93       *
  94       * @return bool Whether the IP is valid
  95       *
  96       * @throws \RuntimeException When IPV6 support is not enabled
  97       */
  98      public static function checkIp6($requestIp, $ip)
  99      {
 100          if (!((extension_loaded('sockets') && defined('AF_INET6')) || @inet_pton('::1'))) {
 101              throw new \RuntimeException('Unable to check Ipv6. Check that PHP was not compiled with option "disable-ipv6".');
 102          }
 103  
 104          if (false !== strpos($ip, '/')) {
 105              list($address, $netmask) = explode('/', $ip, 2);
 106  
 107              if ($netmask < 1 || $netmask > 128) {
 108                  return false;
 109              }
 110          } else {
 111              $address = $ip;
 112              $netmask = 128;
 113          }
 114  
 115          $bytesAddr = unpack('n*', @inet_pton($address));
 116          $bytesTest = unpack('n*', @inet_pton($requestIp));
 117  
 118          if (!$bytesAddr || !$bytesTest) {
 119              return false;
 120          }
 121  
 122          for ($i = 1, $ceil = ceil($netmask / 16); $i <= $ceil; ++$i) {
 123              $left = $netmask - 16 * ($i - 1);
 124              $left = ($left <= 16) ? $left : 16;
 125              $mask = ~(0xffff >> $left) & 0xffff;
 126              if (($bytesAddr[$i] & $mask) != ($bytesTest[$i] & $mask)) {
 127                  return false;
 128              }
 129          }
 130  
 131          return true;
 132      }
 133  }