generate ip host config list form the host file at http://someonewhocares.org/hosts/ . Useful for blocking adds, spyware and shocks sites for whole networks

hosts to ip host

<?php
/*
 * Hosts to ip host
 * 
 * @author Jesse Baird <jebaird@gmail.com>
 * @date 12/21/2012
 * 
 * Licensed under The MIT License
 * http://opensource.org/licenses/MIT
 * 
 * Make hosts file into ip host command for cisco ios
 * 
 * http://someonewhocares.org/hosts/
 * 
 
 * 
 * 
 * Back story / abstract 
 * 
 * I recently ditched add block plus for firefox because it was eating my machine alive. I switched to using hostsman witch is a great utility for windows. 
 * But I felt that there was a better way to block ads for my entire home network. Since I have a Cisco router I decided to set it up as a domain forwarder
 * I needed to setup a list of hosts to block. So I decided to make this script to pull the great hosts file from someonewhocares.org (many thanks to them!) 
 * But Cisco being Cisco didn't make it easy on me. If you get errors about not enough memory when trying to copy running-config to startup-config check out https://supportforums.cisco.com/docs/DOC-1841
 * 
 * TODO:
 * It would be nice to add in the comments into the config that are in this host file
 */

$TEST_MODE = FALSE;
 
/* 
 *
 * out put for the Cisco config
 */
const NEWLINE = "\n";
 
/*
 * chagne this to the ip you wish to redirect to
 */
$IP = '0.0.0.0';
$HOSTFILE_LOCATION = 'http://someonewhocares.org/hosts/zero/hosts';
/*
 * the path and output filename
 */
$FILENAME_OUT = './hosts-to-ip-host-config.txt';



$FILENAME_OUT_CONFIG_HEADER = "!The following hosts are from ".$HOSTFILE_LOCATION." generated from, hosts to ip host By Jesse Baird <jebaird@gmail.com>".NEWLINE;




/*#############################################
 * 
 *############################################# 
 */
 
echo "Fetching hosts file.....";

if( $TEST_MODE ){
$hosts = <<<HOST
#<localhost>
127.0.0.1   localhost
127.0.0.1 	localhost.localdomain
255.255.255.255	broadcasthost
::1		localhost
127.0.0.1 	local
fe80::1%lo0     localhost
#</localhost>

#<shock-sites>
# For example, to block unpleasant pages, try:
0.0.0.0 goatse.cx       # More information on sites such as 
0.0.0.0 www.goatse.cx   # these can be found in this article
0.0.0.0 oralse.cx       # en.wikipedia.org/wiki/List_of_shock_sites
0.0.0.0 www.oralse.cx
0.0.0.0 goatse.ca
0.0.0.0 www.goatse.ca
0.0.0.0 oralse.ca
0.0.0.0 www.oralse.ca
0.0.0.0 goat.cx
0.0.0.0 www.goat.cx
0.0.0.0 1girl1pitcher.org
0.0.0.0 1guy1cock.com
0.0.0.0 1man1jar.org

HOST;
	
}else{
	$hosts = file_get_contents( $HOSTFILE_LOCATION );	
}



echo "done\n";

echo "Stripping started...";

//strip out everything before the #</localhost>
$hosts = substr($hosts, strpos( $hosts, '#</localhost>') + 14 );

//remove all comments
$hosts = preg_replace('/#.+/', "\n", $hosts);
//remove most of the white space

$hosts = preg_replace('/\s{2,100}/', ' ', $hosts);

$hosts = preg_replace('/\n/', ' ', $hosts);
$hosts = preg_replace('/\r/', ' ', $hosts);

 /* 
 *
 * find all of the valid host names
 * http://stackoverflow.com/questions/106179/regular-expression-to-match-hostname-or-ip-address
 * 
 */
$hostNames = preg_split('/(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])/', $hosts);
//print_r($hostNames);
echo "done\n";

echo "There are ".count( $hostNames )." hosts. Building list...\n";

$ipHost ="";

foreach( $hostNames as $name ){
	$name = trim( $name );
	
	if( !$name ){
		continue;
	}
	$ipHost .= "ip host ".$name." ". $IP.NEWLINE;
	
}


file_put_contents($FILENAME_OUT, $FILENAME_OUT_CONFIG_HEADER.$ipHost );

echo "Done. Check ".$FILENAME_OUT. ' for the updated ip host list.';