<?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 $ips List of IPs or subnets (can be a string if only a single one)
*
* @return boolean Whether the IP is valid
*/
public static function checkIp($requestIp, $ips)
{
if (!is_array($ips)) {
$ips = array($ips);
}
$method = false !== strpos($requestIp, ':') ? '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 $ip IPv4 address or subnet in CIDR notation
*
* @return boolean Whether the IP is valid
*/
public static function checkIp4($requestIp, $ip)
{
if (false !== strpos($ip, '/')) {
list($address, $netmask) = explode('/', $ip, 2);
if ($netmask < 1 || $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 $ip IPv6 address or subnet in CIDR notation
*
* @return boolean Whether the IP is valid
*
* @throws \RuntimeException When IPV6 support is not enabled
*/
public static function checkIp6($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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