Introduction
Introduction -- Introduction to Net_DNSBL
Description
PEAR::Net_DNSBL provides an easy way to check if a given Host or URL
is listed on an DNS-based Blackhole List (DNSBL, Real-time Blackhole
List or RBL) or Spam URI Realtime Blocklist (SURBL).
Please not that this currently only works with IPv4 IPs.
Usage
Let's start with a simple example to check if the remote host is
listed in two blacklists:
<?php
require_once 'Net/DNSBL.php';
$dnsbl = new Net_DNSBL();
$remoteIP = $_SERVER['REMOTE_ADDR'];
$remoteIP = '81.70.69.193';
$dnsbl->setBlacklists(array('sbl-xbl.spamhaus.org', 'bl.spamcop.net'));
if ($dnsbl->isListed($remoteIP)) {
// do something
}
?>
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This example shows how to check if an URL is listed in a SURBL:
<?php
require_once 'Net/DNSBL/SURBL.php';
$surbl = new Net_DNSBL_SURBL();
if ($surbl->isListed($addData['url'])) {
// do something
}
?>
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An example how to extract URLS from a text can be found on
http://www.phpfreaks.com/quickcode/Extract_All_URLs_on_a_Page/15.php
and be used this way:
<?php
foreach ($extracted_urls as $surbl_check_url) {
if ($surbl->isListed($surbl_check_url)) {
// do something
break;
}
}
?>
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Let's get some details, if our host is listed:
<?php
require_once 'Net/DNSBL.php';
$dnsbl = new Net_DNSBL();
$dnsbl->setBlacklists(array('sbl-xbl.spamhaus.org', 'bl.spamcop.net'));
if ($dnsbl->isListed($_SERVER['REMOTE_ADDR'])) {
var_dump($dnsbl->getDetails($_SERVER['REMOTE_ADDR']));
var_dump($dnsbl->getTxt($_SERVER['REMOTE_ADDR']));
var_dump($dnsbl->getListingBl($_SERVER['REMOTE_ADDR']));
var_dump($dnsbl->getListingRecord($_SERVER['REMOTE_ADDR']);
}
?>
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