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<?php
declare(strict_types=1);
/*
* @copyright 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace OC\Net;
use IPLib\Address\IPv6;
use IPLib\Factory;
use IPLib\ParseStringFlag;
use Symfony\Component\HttpFoundation\IpUtils;
use function filter_var;
/**
* Classifier for IP addresses
*
* @internal
*/
class IpAddressClassifier {
private const LOCAL_ADDRESS_RANGES = [
'100.64.0.0/10', // See RFC 6598
'192.0.0.0/24', // See RFC 6890
];
/**
* Check host identifier for local IPv4 and IPv6 address ranges
*
* Hostnames are not considered local. Use the HostnameClassifier for those.
*
* @param string $ip
*
* @return bool
*/
public function isLocalAddress(string $ip): bool {
$parsedIp = Factory::parseAddressString(
$ip,
ParseStringFlag::IPV4_MAYBE_NON_DECIMAL | ParseStringFlag::IPV4ADDRESS_MAYBE_NON_QUAD_DOTTED
);
if ($parsedIp === null) {
/* Not an IP */
return false;
}
/* Replace by normalized form */
if ($parsedIp instanceof IPv6) {
$ip = (string)($parsedIp->toIPv4() ?? $parsedIp);
} else {
$ip = (string)$parsedIp;
}
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE)) {
/* Range address */
return true;
}
if (IpUtils::checkIp($ip, self::LOCAL_ADDRESS_RANGES)) {
/* Within local range */
return true;
}
return false;
}
}
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