adblock merlin -- USB example

#!/bin/sh

# services-start by mark3748 August 30, 2015
# original script by Todd Stein (toddbstein@gmail.com), Saturday, October 25, 2014 -- https://github.com/tablespoon/fun/blob/master/adblocker.sh
# modified for use on ASUS-WRT routers running Merlin firmware

# Periodically download lists of known ad and malware servers, and prevents traffic from being sent to them.
# This is a complete rewrite of a script originally written by teffalump (https://gist.github.com/teffalump/7227752).



HOST_LISTS="
    http://adaway.org/hosts.txt
    http://www.malwaredomainlist.com/hostslist/hosts.txt
    http://www.mvps.org/winhelp2002/hosts.txt
    http://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&startdate%5Bday%5D=&startdate%5Bmonth%5D=&star
"

BLOCKLIST=/tmp/mnt/My_Passport/ADBLOCK/adblocker_hostlist
BLACKLIST=/tmp/mnt/My_Passport/ADBLOCK/adblocker_blacklist
WHITELIST=/tmp/mnt/My_Passport/ADBLOCK/adblocker_whitelist

# get script's absolute path and escape spaces
cd "${0%/*}"
SCRIPT_NAME="$PWD/${0##*/}"
SCRIPT_NAME="${SCRIPT_NAME// /' '}"
cd "$OLDPWD"

# await internet connectivity before proceeding (in case rc.local executes this script before connectivity is achieved)
until ping -c1 -w3 google.com || ping -c1 -w3 yahoo.com; do
    sleep 5
done &>/dev/null

# initialize block list
>"$BLOCKLIST"

# grab blacklisted domains if any have been specified
[ -s "$BLACKLIST" ] && awk '/^[^#]/ { print "0.0.0.0",$1 }' "$BLACKLIST" >>"$BLOCKLIST"

# grab host lists from the internet
wget -qO- $HOST_LISTS | grep -w ^0.0.0.0 | sed $'s/\r$//' | sort -u > "$BLOCKLIST"

# remove any whitelisted domains from the block list
if [ -s "$WHITELIST" ]; then
    # create a pipe-delimited list of all non-commented words in whitelist
    white_listed_regex=`echo \`grep -o '^[^#]\+' "$WHITELIST"\` | tr ' ' '|'`
    sed -ri "/$white_listed_regex/d" "$BLOCKLIST"
fi

# add IPv6 blocking
sed -ri 's/([^ ]+)$/\1\n::      \1/' "$BLOCKLIST"

# add block list to dnsmasq config
cp $BLOCKLIST  /jffs/dnsmasq.adblock.conf
echo "#adblocking" > /tmp/mnt/My_Passport/ADBLOCK/dnsmasq.conf.add
echo "address=/0.0.0.0/0.0.0.0" >> /jffs/configs/dnsmasq.conf.add
echo "ptr-record=0.0.0.0.in-addr.arpa,0.0.0.0" >> /jffs/configs/dnsmasq.conf.add
echo "addn-hosts=/tmp/mnt/My_Passport/ADBLOCK/dnsmasq.adblock.conf" >> /jffs/configs/dnsmasq.conf.add

# restart dnsmasq service
service restart_dnsmasq