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Author: admin
Posted: October 26th 2012

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blacklist lookup — by admin

description

This blacklist lookup function is a modification of this snippet. The difference is, that it returns if it suspects an ip is a spammer. If 50% or more of the lookups think your a spammer, the function returns true otherwise false.

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<?php

function blacklist($ip){

    $listed = true;

    $dnsbl_lookup = array(

        "dnsbl-1.uceprotect.net",

        "dnsbl-2.uceprotect.net",

        "dnsbl-3.uceprotect.net",

        "dnsbl.dronebl.org",

        "dnsbl.sorbs.net",

        "zen.spamhaus.org"

    ); // Add your preferred list of DNSBL's

    $lookups = count($dnsbl_lookup);

    $total = 0;

    if($ip){

        $reverse_ip = implode(".", array_reverse(explode(".", $ip)));

        foreach($dnsbl_lookup as $host){

            if(checkdnsrr($reverse_ip.".".$host.".", "A")){

                $total++;

            }

        }

    }

    $percent = ($total / $lookups) * 100;

    if($percent >= 50){

        return true;

    }else{

        return false;

    }

}



if(blacklist($_SERVER["REMOTE_ADDR"])){

    die("Your on the blacklist!");

}

// Continue with page