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Rafael Montagud rmontagud

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<?php
// Simple DNSBL/RBL PHP function - trust me, it's better than checkdnsrr, fsock, socket_create, Net::DNSBL and Net::DNS
// Here's a [better] way to quickly check if an IP is in a DNSBL / RBL. It works on Windows and Linux,
// assuming nslookup is installed. It also supports timeout in seconds.
function ipInDnsBlacklist($ip, $server, $timeout=1) {
$response = array();
$host = implode(".", array_reverse(explode('.', $ip))).'.'.$server.'.';
$cmd = sprintf('nslookup -type=A -timeout=%d %s 2>&1', $timeout, escapeshellarg($host));
@exec($cmd, $response);