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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
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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