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