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55 lines
1.1 KiB
PHP
55 lines
1.1 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* SPDX-FileCopyrightText: 2022 Nextcloud GmbH and Nextcloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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namespace OC\Net;
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use function filter_var;
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use function in_array;
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use function strrchr;
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use function substr;
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use function substr_count;
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/**
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* Classifier for network hostnames
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*
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* @internal
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*/
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class HostnameClassifier {
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private const LOCAL_TOPLEVEL_DOMAINS = [
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'local',
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'localhost',
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'intranet',
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'internal',
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'private',
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'corp',
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'home',
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'lan',
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];
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/**
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* Check host identifier for local hostname
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*
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* IP addresses are not considered local. Use the IpAddressClassifier for those.
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*/
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public function isLocalHostname(string $hostname): bool {
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// Disallow local network top-level domains from RFC 6762
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$topLevelDomain = substr((strrchr($hostname, '.') ?: ''), 1);
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if (in_array($topLevelDomain, self::LOCAL_TOPLEVEL_DOMAINS)) {
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return true;
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}
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// Disallow hostname only
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if (substr_count($hostname, '.') === 0 && !filter_var($hostname, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
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return true;
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}
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return false;
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}
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}
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