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web/vendor/symfony/http-foundation/IpUtils.php

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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, $ip)
+    {
+        if (!filter_var($requestIp, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
+            return false;
+        }
+
+        if (false !== strpos($ip, '/')) {
+            list($address, $netmask) = explode('/', $ip, 2);
+
+            if ($netmask === '0') {
+                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));
+
+        if (!$bytesAddr || !$bytesTest) {
+            return false;
+        }
+
+        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;
+    }
+}