generate.bash

#!/bin/bash

target_ip=255.255.255.255

whitelist=(
  localhost.localdomain
  local
  localhost
  broadcasthost
  0.0.0.0
)

# Ripped this list from Pi-Hole:
# https://raw.githubusercontent.com/pi-hole/pi-hole/master/adlists.default
hostfiles=(
  https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
  https://mirror1.malwaredomains.com/files/justdomains
  http://sysctl.org/cameleon/hosts
  https://zeustracker.abuse.ch/blocklist.php?download=domainblocklist
  https://s3.amazonaws.com/lists.disconnect.me/simple_tracking.txt
  https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt
  https://hosts-file.net/ad_servers.txt
)

regex_ip='[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
regex_whitelist="^($(sed -e 's#\.#\\.#g' -e 's# #|#g' <<<"${whitelist[@]}"))$"

function to_hosts {
  sed -e "s/^/$target_ip /"
}

function to_dnsmasq {
  sed -E "N;s#\\n#/#g;s#.*#address=/&/$target_ip#"
}

curl "${hostfiles[@]}" | \
  sed -E -e "s/^($regex_ip)?[[:space:]]+//g" -e 's/[[:space:]]*(#.*)?$//g' | \
  grep -E -v -e "$regex_whitelist" -e "[ #]" -e "^$" | \
  sort -u | \
  to_dnsmasq