Charles Kozlers Personal Website

<?php
 
	function emptyArray( $array )
	{
		$size = sizeof( $array );
		for( $i = 0; $i < $size; $i++ )
		{
			array_pop( $array );
		}
	}
?>

<?php
//Get remote host
$_get_addr = $_SERVER['REMOTE_ADDR'];
 
//Get the host from the address
$_get_host = gethostbyaddr( $_get_addr );
 
//Ban list array.  The text before => is a key name and
//after the => is the host you want to ban.  This allows
//for aliasing your problematic hostnames
$_config_hostbanlist = array( 
				russia1 => "nn-88-237.nm-s.ru"
			);
 
/*
Ban by full hostname.  The list is populated by the hostbanlist
array.  Simply it just compares their host with an entry in the 
hostbanlist array
*/
function isHostBanned( $host, $_ban_list )
{
	//Iterate each entry in the banned list array
	foreach( $_ban_list as $entry )
	{
		//If we get a match, return true (the host is banned)
		if( strtolower( $host ) == strtolower( $entry ) )
			return true;
	}
	return false;
}
 
/*
This will ban by IP.  This list is populated dynamically by the
hostbanlist variable.  It then resolves IP's for each hostname
in the list and then checks it.
*/
function isIPBanned( $_remote_addr, $_ban_list )
{
	foreach( $_ban_list as $entry )
	{
		$entry_ip = gethostbyname( strtolower( $entry ) );
		if( $_remote_addr == $entry_ip )
			return true;
	}
	return false;
}
function doAlert( $alert )
{
	echo "<script language='JavaScript'>window.alert( \"$alert\" )</script>";
}
 
/*
We will be checking for true/false of isIPBanned first since the IP banned list is populated by
the $_config_hostbanlist array and isIPBanned resolves the hostname to an IP.  Then, if that fails, it
also then checks the hostname and compares to the list again via hostname.
 
Flow:
 
isIPBanned? -> loop hostbanlist -> resolve IP for given loop iteration -> check IP resolved to REMOTE_ADDR
		-> Match? => Banned
		-> No Match? => Not in that list, assume they are either not in the list or 
				their IP could not be resolved.  Go to isHostBanned function
				to ensure they are not in the list
 
isHostBanned -> loop hostbanlist -> check if their host is equal to an entry in the array
		-> Match? => Banned
		-> No match? => Not banned
*/
 
if( isIPBanned( $_get_addr, $_config_hostbanlist ) || isHostBanned( $_get_host, $_config_hostbanlist ) )
{	
	doAlert( "You are banned" );
	echo "<br><br><br><p align='center'>Your host [$_get_host] and/or IP [$_get_addr] has been banned.  <br>
		Please contact <a href='mailto:webmaster@ckozler.net'>webmaster@ckozler.net</a> 
		if you feel you have reached this page in error</p>" . "<br>";
	exit;
}
?>

require('hostblock.php');