function phpAds_proxyLookup()
{
global $phpAds_config;
if (!$phpAds_config['proxy_lookup']) {
return;
}
$proxy = false;
if (isset($_SERVER['HTTP_VIA']) && $_SERVER['HTTP_VIA'] != '') {
$proxy = true;
}
if (isset($_SERVER['REMOTE_HOST'])) {
if (is_int(strpos($_SERVER['REMOTE_HOST'], 'proxy'))) {
$proxy = true;
}
if (is_int(strpos($_SERVER['REMOTE_HOST'], 'cache'))) {
$proxy = true;
}
if (is_int(strpos($_SERVER['REMOTE_HOST'], 'inktomi'))) {
$proxy = true;
}
}
if ($proxy) {
$IP = '';
// Overwrite host address if a suitable header is found
if (isset($_SERVER['HTTP_FORWARDED']) && $_SERVER['HTTP_FORWARDED'] != '') {
$IP = $_SERVER['HTTP_FORWARDED'];
}
if (isset($_SERVER['HTTP_FORWARDED_FOR']) && $_SERVER['HTTP_FORWARDED_FOR'] != '') {
$IP = $_SERVER['HTTP_FORWARDED_FOR'];
}
if (isset($_SERVER['HTTP_X_FORWARDED']) && $_SERVER['HTTP_X_FORWARDED'] != '') {
$IP = $_SERVER['HTTP_X_FORWARDED'];
}
if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'] != '') {
$IP = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
if (isset($_SERVER['HTTP_CLIENT_IP']) && $_SERVER['HTTP_CLIENT_IP'] != '') {
$IP = $_SERVER['HTTP_CLIENT_IP'];
}
// Get last item from list
$IP = explode(',', $IP);
$IP = trim($IP[count($IP) - 1]);
if ($IP && $IP != 'unknown' && !phpAds_PrivateSubnet($IP)) {
$_SERVER['REMOTE_ADDR'] = $IP;
$_SERVER['REMOTE_HOST'] = '';
}
}
}
if (isset($HTTP_SERVER_VARS['HTTP_FORWARDED_FOR']) && $HTTP_SERVER_VARS['HTTP_FORWARDED_FOR'] != '') {
$IP = $HTTP_SERVER_VARS['HTTP_FORWARDED_FOR'];
}
if (isset($HTTP_SERVER_VARS['HTTP_X_FORWARDED']) && $HTTP_SERVER_VARS['HTTP_X_FORWARDED'] != '') {
$IP = $HTTP_SERVER_VARS['HTTP_X_FORWARDED'];
}
if (isset($HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR']) && $HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR'] != '') {
$IP = $HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR'];
}
if (isset($HTTP_SERVER_VARS['HTTP_CLIENT_IP']) && $HTTP_SERVER_VARS['HTTP_CLIENT_IP'] != '') {
$IP = $HTTP_SERVER_VARS['HTTP_CLIENT_IP'];
}
// Get last item from list
$IP = explode(',', $IP);
$IP = trim($IP[count($IP) - 1]);
if ($IP && $IP != 'unknown' && !phpAds_PrivateSubnet($IP)) {
$HTTP_SERVER_VARS['REMOTE_ADDR'] = $IP;
$HTTP_SERVER_VARS['REMOTE_HOST'] = '';
}
}
}
// Reverse lookup
if (!isset($HTTP_SERVER_VARS['REMOTE_HOST']) || $HTTP_SERVER_VARS['REMOTE_HOST'] == '') {
if ($phpAds_config['reverse_lookup']) {
$HTTP_SERVER_VARS['REMOTE_HOST'] = @gethostbyaddr($HTTP_SERVER_VARS['REMOTE_ADDR']);
} else {
$HTTP_SERVER_VARS['REMOTE_HOST'] = $HTTP_SERVER_VARS['REMOTE_ADDR'];
}
}
// Geotracking
if ($phpAds_config['geotracking_type'] != '') {
