PHPSome php programming tricks
Detect User's IP
<?php
if(!function_exists("gethost")){
function gethost($ip) {
$list=explode(",", $ip);
$ret="";
foreach($list as $item) {
$item=trim($item);
$tmp=@gethostbyaddr($item);
if($tmp==$item) $tmp="";
$ret.=$tmp." ";
}
$ret=trim($ret);
return addslashes($ret);
}
}
function isValidIP($ip){
if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ||
filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) return true;
else return false;
}
function getFirstIP($ip,$delim){
if (strstr($ip, $delim)) {
$ips = explode($delim, $ip);
foreach($ips as $ip) {
if (isValidIP($ip)) return $ip;
}
return $ips;
} else return $ip;
}
$ips = array();
$proxies = array();
$logmsg="";
if (!empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
if (isValidIP($_SERVER["HTTP_X_FORWARDED_FOR"])) {
if (!in_array($_SERVER["HTTP_X_FORWARDED_FOR"],$proxies)) $proxies[] = $_SERVER["HTTP_X_FORWARDED_FOR"];
} else {
$logmsg.= "Proxy (HTTP_X_FORWARDED_FOR) not valid: ".$_SERVER["HTTP_X_FORWARDED_FOR"]."\n";
}
}
if (!empty($_SERVER["HTTP_VIA"])) {
$via_ignorelist = array(
"1.1 squid.test (squid/3.5.20)"
);
if (isValidIP($_SERVER["HTTP_VIA"])) {
if (!in_array($_SERVER["HTTP_VIA"],$proxies)) $proxies[] = $_SERVER['HTTP_VIA'];
} else {
if (!in_array($_SERVER["HTTP_VIA"],$via_ignorelist)) $logmsg.= "Proxy (HTTP_VIA) not valid: ".$_SERVER["HTTP_VIA"]."\n";
}
}
if (!empty($_SERVER["REMOTE_ADDR"])) {
if (isValidIP($_SERVER["REMOTE_ADDR"])) {
if (!in_array($_SERVER["REMOTE_ADDR"],$ips)) $ips[] = $_SERVER["REMOTE_ADDR"];
} else {
$logmsg.= "IP (REMOTE_ADDR) not valid: ".$_SERVER["REMOTE_ADDR"]."\n";
}
}
if (!empty($_SERVER["HTTP_CLIENT_IP"]) && isValidIP($_SERVER["HTTP_CLIENT_IP"])) {
if (isValidIP($_SERVER["HTTP_CLIENT_IP"])) {
if (!in_array($_SERVER["HTTP_CLIENT_IP"],$ips)) $ips[] = $_SERVER["HTTP_CLIENT_IP"];
} else {
$logmsg.= "IP (HTTP_CLIENT_IP) not valid: ".$_SERVER["HTTP_CLIENT_IP"]."\n";
}
}
if (!empty($ips)) $ip = $ips[0];
else $ip = "unknown";
if (!empty($proxies)) $proxy = $proxies[0];
else $proxy = "";
if (count($ips) > 1) $logmsg .= "Multiple ip's: ".implode(" ", $ips)."\n";
if (count($proxies) > 1) $logmsg .= "Multiple proxies: ".implode(" ", $proxies)."\n";
if($ip != "unknown") {
if (isValidIP($ip)) $host=gethost($ip);
else $host="[Invalid IP]";
} else $host = "";
if ($logmsg) {
$file=fopen("$prefix/logs/getip.txt", "a");
$msg = getinfo()."\n".$logmsg;
fwrite($file, $msg);
fclose($file);
}
/*if (!isValidIP($ip)) {
$ret=getFirstIP($ip,',');
if (gettype($ret) == "array") {
foreach ($ret as $ip){
$ret2=getFirstIP($ip,':');
if (gettype($ret2) == "array"){
$ip=false;
} else $ip = $ret2;
}
} else $ip = $ret;
if (!isValidIP($ip)) {
$ret=getFirstIP($ip,':');
if (gettype($ret) == "array"){
$ip=false;
} else $ip = $ret;
}
}*/
?>
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