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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 function filter_var;
use function in_array;
use function strrchr;
use function substr;
use function substr_count;
/**
* Classifier for network hostnames
*
* @internal
*/
class HostnameClassifier {
private const LOCAL_TOPLEVEL_DOMAINS = [
'local',
'localhost',
'intranet',
'internal',
'private',
'corp',
'home',
'lan',
];
/**
* Check host identifier for local hostname
*
* IP addresses are not considered local. Use the IpAddressClassifier for those.
*/
public function isLocalHostname(string $hostname): bool {
// Disallow local network top-level domains from RFC 6762
$topLevelDomain = substr((strrchr($hostname, '.') ?: ''), 1);
if (in_array($topLevelDomain, self::LOCAL_TOPLEVEL_DOMAINS)) {
return true;
}
// Disallow hostname only
if (substr_count($hostname, '.') === 0 && !filter_var($hostname, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return true;
}
return false;
}
}
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