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#!/bin/bash
# snippet from https://stackoverflow.com/questions/10768160/ip-address-converter
ip2dec () {
local a b c d ip=$@
IFS=. read -r a b c d <<< "$ip"
printf '%d\n' "$((a * 256 ** 3 + b * 256 ** 2 + c * 256 + d))"
}
# Only run this if there is a hypen present in $1
if [[ "$1" =~ "-" ]]; then
# This only works with real bash (<<<) - split IP addresses into array with
# hyphen as delimiter
readarray -d - -t strarr <<< $1
ipaddrcheck --is-ipv4-single ${strarr[0]}
if [ $? -gt 0 ]; then
exit 1
fi
ipaddrcheck --is-ipv4-single ${strarr[1]}
if [ $? -gt 0 ]; then
exit 1
fi
start=$(ip2dec ${strarr[0]})
stop=$(ip2dec ${strarr[1]})
if [ $start -ge $stop ]; then
exit 1
fi
fi
exit 0
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