Bash script to add myip.ms IP blacklist to iptables

block_ip.sh

#!/bin/bash

SETNAME="ip_blacklist"
SETNAME6="ip6_blacklist"
SOURCE="https://myip.ms/files/blacklist/general/full_blacklist_database.zip"
ADDRESSES=$(curl $SOURCE 2>/dev/null | gunzip | awk '$1 ~ /^[^#]/ {print $1}')

# only proceed if new ip's are obtained
if [ -n "$ADDRESSES" ]; then 
  # ensure list ipv4 exists
  ipset list $SETNAME &>/dev/null
  if [ $? -ne 0 ]; then
    ipset create $SETNAME hash:ip hashsize 32768 maxelem 200000
    iptables -I INPUT -m set --match-set $SETNAME src -j DROP
  fi

  # ensure list ipv6 exists
  ipset list $SETNAME6 &>/dev/null
  if [ $? -ne 0 ]; then
    ipset create $SETNAME6 hash:ip family inet6 hashsize 32768 maxelem 200000
    ip6tables -I INPUT -m set --match-set $SETNAME6 src -j DROP
  fi
  # clear existing ipv4 set
  ipset flush $SETNAME

  # clear existing ipv6 set
  ipset flush $SETNAME6

  # add each address to respective blacklist
  for ip in $ADDRESSES ;
    do
      if [[ $ip =~ .*:.* ]]
      then
        # ipv6
        ipset add $SETNAME6 $ip
      else
        # ipv4
        ipset add $SETNAME $ip
      fi
  done
fi