84 lines
2.6 KiB
PHP
84 lines
2.6 KiB
PHP
<?
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/*
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* Calculate the effective registered domain of a fully qualified domain name.
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*
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* <@LICENSE>
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to you under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* </@LICENSE>
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*
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* Florian Sager, 25.07.2008, sager@agitos.de
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*/
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/*
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* Remove subdomains from a signing domain to get the registered domain.
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*
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* dkim-reputation.org blocks signing domains on the level of registered domains
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* to rate senders who use e.g. a.spamdomain.tld, b.spamdomain.tld, ... under
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* the most common identifier - the registered domain - finally.
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*
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* This function returns NULL if $signingDomain is TLD itself
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*/
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function getRegisteredDomain($signingDomain) {
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global $tldTree;
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$signingDomainParts = explode('.', $signingDomain);
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$result = findRegisteredDomain($signingDomainParts, $tldTree);
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if ($result===NULL || $result=="") {
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// this is an invalid domain name
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return NULL;
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}
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// assure there is at least 1 TLD in the stripped signing domain
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if (!strpos($result, '.')) {
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$cnt = count($signingDomainParts);
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if ($cnt==1 || $signingDomainParts[$cnt-2]=="") return NULL;
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return $signingDomainParts[$cnt-2].'.'.$signingDomainParts[$cnt-1];
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}
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return $result;
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}
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// recursive helper method
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function findRegisteredDomain($remainingSigningDomainParts, &$treeNode) {
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$sub = array_pop($remainingSigningDomainParts);
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$result = NULL;
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if (isset($treeNode['!'])) {
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return '#';
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} else if (is_array($treeNode) && array_key_exists($sub, $treeNode)) {
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$result = findRegisteredDomain($remainingSigningDomainParts, $treeNode[$sub]);
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} else if (is_array($treeNode) && array_key_exists('*', $treeNode)) {
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$result = findRegisteredDomain($remainingSigningDomainParts, $treeNode['*']);
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} else {
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return $sub;
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}
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// this is a hack 'cause PHP interpretes '' as NULL
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if ($result == '#') {
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return $sub;
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} else if (strlen($result)>0) {
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return $result.'.'.$sub;
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}
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return NULL;
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}
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?>
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