silverstripe-framework/control/IPUtils.php

130 lines
3.3 KiB
PHP

<?php
/**
* These helpful functions were lifted from the Symfony library
* https://github.com/symfony/http-foundation/blob/master/LICENSE
*
* Http utility functions.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
namespace SilverStripe\Control\Util;
/**
* 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 $ips List of IPs or subnets (can be a string if only a single one)
*
* @return bool Whether the IP is valid
*
* @package framework
* @subpackage core
*/
public static function checkIP($requestIP, $ips) {
if (!is_array($ips)) {
$ips = array($ips);
}
$method = substr_count($requestIP, ':') > 1 ? 'checkIP6' : 'checkIP4';
foreach ($ips as $ip) {
if (self::$method($requestIP, trim($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;
}
}