Adblock skript for OpenWrt. Tested on Attitude Adjustment 12.09

adblock

#!/bin/sh /etc/rc.common

# Copy this skript to /etc/init.d/adblock and enable:
#   chmod +x /etc/init.d/adblock
#   /etc/init.d/adblock enable

START=90

ADS='http://pgl.yoyo.org/as/serverlist.php?hostformat=dnsmasq&showintro=0&mimetype=plaintext'

WWW2="/tmp/www2"
GIF1="1.gif"

DM_CONF=/var/etc/dnsmasq.conf
DM_BAD=/var/etc/dnsmasq.bad

ssd=start-stop-daemon

UPID1=/var/run/uhttpd_main.pid
UPID2=/var/run/uhttpd_www2.pid
UH=/usr/sbin/uhttpd

start() {
	mkdir -p $WWW2
	echo -ne 'GIF89a1010\x8000\xff\xff\xff000!\xf9\x0400000,000010100\x02\x02D10;' | tr 01 '\000\001' > $WWW2/$GIF1

	# Choose an unused IP
	ip=$(uci get network.lan.ipaddr)
	ip2=10.3.5.3
	case $ip in 10.3.*) ip2=10.4.6.4 ;; esac
	ifconfig br-lan:1 inet $ip2 netmask 255.255.255.255

	# Restart uhttpd to listen only LAN
	if [ -f "$UPID1" ]; then
		uargs="$(cat /proc/$(cat $UPID1)/cmdline | tr '\000' ' ' | cut -d ' ' -f 2- )"
		if echo "$uargs" | grep -q '0.0.0.0'; then
			uargs=$(echo $uargs | sed -e "s/0\.0\.0\.0/$ip/")
			$ssd -Kqs HUP -p $UPID1
			sleep 1
			$ssd -Sqbmp $UPID1 -x $UH -- $uargs
		fi
	fi

	# Start another uhttpd
	$ssd -Sqbmp $UPID2 -x $UH -- -f -h $WWW2 -E /$GIF1 -I $GIF1 -p $ip2:80

	# Add rules to dnsmasq
	wget -qO $DM_BAD "$ADS" && sed -i -e "s/127\.0\.0\.1/$ip2/" $DM_BAD
	if [ -f $DM_CONF -a -f $DM_BAD ] && ! grep -q $DM_BAD $DM_CONF; then
		$ssd -Kqn dnsmasq
		sleep 1
		echo "conf-file=$DM_BAD" >> $DM_CONF
		$ssd -Sqx dnsmasq -- -C $DM_CONF
	fi
}

stop() {
	$ssd -Kqs HUP -p $UPID2
}

Thanks!
Here is my suggestion https://gist.github.com/someon/9609363
This script run in background and updates bad hosts list every 6 hours.