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use `host` if available for standard DNS lookups too

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This commit is contained in:
Michael Save 2012-03-15 14:00:25 +11:00
parent 81c9b612bc
commit 3179eef338
1 changed files with 29 additions and 4 deletions
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31
inc/functions.php
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@ -1302,8 +1302,8 @@
foreach($config['dnsbl'] as &$blacklist) {
$lookup = $ip . '.' . $blacklist;
$host = gethostbyname($lookup);
if($host != $lookup) {
$host = DNS($lookup);
if($host !== false) {
// On NXDOMAIN (meaning it's not in the blacklist), gethostbyname() returns the host unchanged.
if(preg_match('/^127\.0\.0\./', $host) && $host != '127.0.0.10')
error(sprintf($config['error']['dnsbl'], $blacklist));
@ -1672,4 +1672,29 @@
return $host;
}
?>
function DNS($host) {
global $config;
if($config['cache']['enabled'] && ($host = cache::get('dns_' . $host))) {
return $host;
}
if(!$config['dns_system']) {
$ip_addr = gethostbyname($host);
if($ip_addr == $host)
return false;
} else {
$resp = shell_exec('host -W 1 ' . $host);
if(preg_match('/has address ([^\s]+)$/', $resp, $m))
$ip_addr = $m[1];
else
return false;
}
if($config['cache']['enabled'])
cache::set('dns_' . $ip_addr, $host, 3600);
return $host;
}