scripts/hosts_swap at master · natemacinnes/scripts · GitHub

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#! /bin/bash
if [ "$1" == "update" ]; then
	if [ -e /etc/hosts.blk.master ]; then
		echo Checking for new hosts firewall file...
		lastdate=`stat -f "%Sm" -t "%a, %d %b %Y %H:%M:%S %Z" /etc/hosts.blk.master`
		modified=`curl -sS -I --header 'If-Modified-Since: $lastdate' http://winhelp2002.mvps.org/hosts.txt`
		if [[ $modified == *"200 OK"* ]]; then
			curl -z "$lastdate" -o /etc/hosts.blk.master http://winhelp2002.mvps.org/hosts.txt
			cp /etc/hosts.blk.master /etc/hosts.blk
			echo Firewall hosts file updated.
		else
			echo Current hosts firewall file up-to-date.
		fi
	else
		echo Downloading hosts firewall file
	        curl -o /etc/hosts.blk.master http://winhelp2002.mvps.org/hosts.txt
		cp /etc/hosts.blk.master /etc/hosts.blk
	fi
fi
echo Swapping hosts files...
if [ -f /etc/hosts_blk.txt ]; then
	echo Reverting file back to default...
	cp /etc/hosts.bk /etc/hosts
	rm /etc/hosts_blk.txt
     	echo Hosts file now default.
else
	echo Turning on hosts firewall...
 	cp /etc/hosts.blk /etc/hosts
	touch /etc/hosts_blk.txt
	echo Host file now blocking.
fi