Converts http://www.nirsoft.net/countryip/mx.csv into a rules of tcpdump

mxcsv2tcpdump.sh

#!/bin/sh
# Converts http://www.nirsoft.net/countryip/mx.csv
# into a rules of tcpdump
#
# Copyright © 2015 Antonio Hernández Blas <hba.nihilismus@gmail.com>
# This program is free software. It comes without any warranty, to
# the extent permitted by applicable law. You can redistribute it
# and/or modify it under the terms of the Do What The Fuck You Want
# To Public License, Version 2, as published by Sam Hocevar. See
# http://www.wtfpl.net/ for more details.

function generate_network_for() {
  ipcalc ${1} - ${2} | tail -1
}

function get_ip_address() {
  echo ${1} | cut -d ',' -f ${2} | xargs
}

function print_list() {
  cat mx.csv | while read line; do

    from_ip_address=$(get_ip_address ${line} 1)
    to_ip_address=$(get_ip_address ${line} 2)

    if [ -z ${from_ip_address} ]; then
      continue
    fi

    generate_network_for ${from_ip_address} ${to_ip_address}
  done
}

function print_tcpdump_list() {
  networks="$(print_list)"
  is_the_first=true

  echo "("
  for network in ${networks}; do
    if ${is_the_first}; then
      echo "    srt net ${network}"
      is_the_first=false
    else
      echo "    ${1} src net ${network}"
    fi
  done
  echo ")"
}

case $# in
  1)
    print_tcpdump_list "${@}"
    ;;
  *)
    echo "Error, you need to indicate the logical operation for rules"
    echo "mxcsv2tcpdump.sh or|and"
    exit 1
    ;;
esac

# EOF