/*
	Gets a text description of the owner for an IP
	How to use this function: get_ip_owner('206.177.43.7');
	Returns: string
	
	Yes, this was written very quickly. The code isn't pretty.
*/

$cached_ips; //Cache the IPs that are looked up to minimize ARIN API calls
function get_ip_owner($ip){
	global $cached_ips;
	
	$ip = trim($ip);
	
	if(strlen($ip) <= 16){ //IPs are always less than or equal to 16 characters
		//If after stripping all but [0-9]/. number is same then it's an IP
		if($ip == filter_var($ip,FILTER_SANITIZE_NUMBER_FLOAT,FILTER_FLAG_ALLOW_FRACTION)){
			if(isset($cached_ips[$ip])) //Return out of cache if possible
				return $cached_ips[$ip];
			$data = file_get_contents('http://whois.arin.net/rest/nets;q='.$ip.'?showDetails=true&showARIN=false&ext=netref2');
			preg_match_all('/\<orgRef.*>(.*)<\/orgRef>/',$data,$matches);
			if(isset($matches[1][0])){
				$xml = simplexml_load_string(file_get_contents($matches[1][0]));
				$info = $xml->city.': ';
				$info .=  $xml->name.' ('.trim($xml->streetAddress->line[0]).', '.trim($xml->streetAddress->line[1]).')';
				$info = str_replace(', )',')',$info); //Remove trailing punctuation
				$cached_ips[$ip] = $info;
				if(strlen($info)>3) //Make sure it's something
					return $info;
			}else{
				$handle = $matches[0][0];
				$handle = substr($handle,strpos($handle,'handle="')+strlen('handle="'));
				$handle = substr($handle,0,strpos($handle,'">'));
				if(strlen($info)>3)
					return $handle;
			}
		}
	}
	
	return $ip; //Not an IP address, spit input back out
}