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<?php
/**
* Cached RDNS Lookup Provider
*
* Provides a service to look up the reverse DNS of an IP address, and caches
* the result in the database.
*/
class CachedRDnsLookupProvider implements IRDnsProvider
{
private $database;
public function __construct(PdoDatabase $database)
$this->database = $database;
}
public function getRdns($address)
$address = trim($address);
// lets look in our cache database first.
$rDns = RDnsCache::getByAddress($address, $this->database);
if ($rDns != null) {
// touch cache timer
$rDns->save();
return $rDns->getData();
// OK, it's not there, let's do an rdns lookup.
$result = @ gethostbyaddr($address);
if ($result !== false) {
$rDns = new RDnsCache();
$rDns->setDatabase($this->database);
$rDns->setAddress($address);
$rDns->setData($result);
return $result;
return null;
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