Generate a poisoned configuration file which bind can eat for blocking domain names. The file the script eats contains one domain per line.

update_dns_adblock_filters

#!/bin/bash
#Created by Sam Gleske
#Thu Jun  7 20:43:09 EDT 2012
adblockfile="dns_ad_block_list.txt"
adblocklistdir="/media/backup/Operating Systems - Linux/Fedora/16/configs"
adblocklist="${adblocklistdir}/${adblockfile}"
backup_dir="/media/backup/Operating Systems - Linux/Fedora/16/configs/etc/named"
outfile="/etc/named/named.conf.ads.block"

echo "Creating a unique domain list."
cp -f "$adblocklist" "${adblocklistdir}/${adblockfile%.txt}.bak.txt" || exit 1
grep '^#' "$adblocklist" > "/tmp/$adblockfile"
sort -u "$adblocklist" | grep -v '#' >> "/tmp/$adblockfile" || exit 1
mv "/tmp/$adblockfile" "$adblocklist" || exit 1
chown sam:users "$adblocklist" "${adblocklistdir}/${adblockfile%.txt}.bak.txt" || exit 1
chmod 644 "$adblocklist" "${adblocklistdir}/${adblockfile%.txt}.bak.txt" || exit 1

echo "Converting ad block list to DNS zone file."
grep -v '#' "${adblocklist}" | awk '$0 != "" { print "zone \""$1"\" in { type master ; file \"poison\" ; };" }' > "$outfile" || exit 1

echo "Back up new zone file."
cp -f "$outfile" "${backup_dir}/" || exit 1

echo "Done."
exit 0