#!/bin/sh

## router IP address
router_ip_address=192.168.1.1

## black-listed domains
blacklist=~/blocked-domains

## ~/blocked-domains is a list of domains to block, one per line
## after a space or tab, comments can be used:
##	adserver.com all ads, all the time

## adblock-wrt54g
## (c) atom@smasher.org, 5 Sep 2006
## PGP = 762A 3B98 A3C3 96C9 C6B7  582A B88D 52E4 D9F5 7808
## distributed under GPL - http://www.gnu.org/copyleft/gpl.html

## some builds of DD-WRT v24-sp1 have a bug that starts multiple
## dnsmasq processes, and causes blocked sites to only be blocked
## for a minute or two. if that happens, it's probably easiest to
## install a different DD-WRT build.

## the black-list is in "~/blocked-domains"
## format the list into a dnsmasq.conf file and write to the temp file
#awk '{print "address=/"$1"/127.0.0.1"}' < ~/blocked-domains > /tmp/${tmp}

## make a backup copy of the original dnsmasq.conf, if a backup doesn't exist
## append the formatted block list to dnsmasq.conf
## kill and restart dnsmasq

awk '$1 ~ /./ {print "address=/"$1"/127.0.0.1"}' < ${blacklist} | \
    ssh root@${router_ip_address} '[ -f /tmp/dnsmasq.conf.orig ] &&	\
    cp /tmp/dnsmasq.conf.orig /tmp/dnsmasq.conf ||			\
    cp /tmp/dnsmasq.conf /tmp/dnsmasq.conf.orig
    cat - >> /tmp/dnsmasq.conf &&					\
    killall dnsmasq
    dnsmasq --conf-file=/tmp/dnsmasq.conf'