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Avoid DNS timeouts by using host and cache if available

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This commit is contained in:
Savetheinternet 2011-12-03 11:52:31 +11:00
parent 3979d9a740
commit dbe3302987
3 changed files with 29 additions and 1 deletions
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24
inc/functions.php
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@ -487,6 +487,7 @@
$query->bindValue(':board', $board);
$query->execute() or error(db_error($query));
}
if($query->rowCount() < 1 && $config['ban_cidr'] && !isIPv6()) {
// my most insane SQL query yet
$query = prepare("SELECT `set`, `expires`, `reason`, `board`, `uri`, `bans`.`id` FROM `bans` LEFT JOIN `boards` ON `boards`.`id` = `board` WHERE (`board` IS NULL OR `uri` = :board)
@ -1472,4 +1473,27 @@
}
}
function rDNS($ip_addr) {
global $config;
if($config['cache']['enabled'] && ($host = cache::get('rdns_' . $ip_addr))) {
return $host;
}
if(!$config['dns_system']) {
$host = gethostbyaddr($ip_addr);
} else {
$resp = shell_exec('host -W 1 ' . $ip_addr);
if(preg_match('/domain name pointer ([^\s]+)$/', $resp, $m))
$host = $m[1];
else
$host = $ip_addr;
}
if($config['cache']['enabled'])
cache::set('rdns_' . $ip_addr, $host, 3600);
return $host;
}
?>