Created
May 25, 2017 01:51
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#!/bin/bash | |
############################ | |
## Methods | |
############################ | |
prefix_to_bit_netmask() { | |
prefix=$1; | |
shift=$(( 32 - prefix )); | |
bitmask="" | |
for (( i=0; i < 32; i++ )); do | |
num=0 | |
if [ $i -lt $prefix ]; then | |
num=1 | |
fi | |
space= | |
if [ $(( i % 8 )) -eq 0 ]; then | |
space=" "; | |
fi | |
bitmask="${bitmask}${space}${num}" | |
done | |
echo $bitmask | |
} | |
bit_netmask_to_wildcard_netmask() { | |
bitmask=$1; | |
wildcard_mask= | |
for octet in $bitmask; do | |
wildcard_mask="${wildcard_mask} $(( 255 - 2#$octet ))" | |
done | |
echo $wildcard_mask; | |
} | |
check_net_boundary() { | |
net=$1; | |
wildcard_mask=$2; | |
is_correct=1; | |
for (( i = 1; i <= 4; i++ )); do | |
net_octet=$(echo $net | cut -d '.' -f $i) | |
mask_octet=$(echo $wildcard_mask | cut -d ' ' -f $i) | |
if [ $mask_octet -gt 0 ]; then | |
if [ $(( $net_octet&$mask_octet )) -ne 0 ]; then | |
is_correct=0; | |
fi | |
fi | |
done | |
echo $is_correct; | |
} | |
####################### | |
## MAIN | |
####################### | |
OPTIND=1; | |
getopts "fibh" force; | |
shift $((OPTIND-1)) | |
if [ $force = 'h' ]; then | |
echo "" | |
echo -e "THIS SCRIPT WILL EXPAND A CIDR ADDRESS.\n\nSYNOPSIS\n ./cidr-to-ip.sh [OPTION(only one)] [STRING/FILENAME]\nDESCRIPTION\n -h Displays this help screen\n -f Forces a check for network boundary when given a STRING(s)\n -i Will read from an Input file (no network boundary check)\n -b Will do the same as –i but with network boundary check\n\nEXAMPLES\n ./cidr-to-ip.sh 192.168.0.1/24\n ./cidr-to-ip.sh 192.168.0.1/24 10.10.0.0/28\n ./cidr-to-ip.sh -f 192.168.0.0/16\n ./cidr-to-ip.sh -i inputfile.txt\n ./cidr-to-ip.sh -b inputfile.txt\n" | |
exit | |
fi | |
if [ $force = 'i' ] || [ $force = 'b' ]; then | |
old_IPS=$IPS | |
IPS=$'\n' | |
lines=($(cat $1)) # array | |
IPS=$old_IPS | |
else | |
lines=$@ | |
fi | |
for ip in ${lines[@]}; do | |
net=$(echo $ip | cut -d '/' -f 1); | |
prefix=$(echo $ip | cut -d '/' -f 2); | |
do_processing=1; | |
bit_netmask=$(prefix_to_bit_netmask $prefix); | |
wildcard_mask=$(bit_netmask_to_wildcard_netmask "$bit_netmask"); | |
is_net_boundary=$(check_net_boundary $net "$wildcard_mask"); | |
if [ $force = 'f' ] && [ $is_net_boundary -ne 1 ] || [ $force = 'b' ] && [ $is_net_boundary -ne 1 ] ; then | |
read -p "Not a network boundary! Continue anyway (y/N)? " -n 1 -r | |
echo ## move to a new line | |
if [[ $REPLY =~ ^[Yy]$ ]]; then | |
do_processing=1; | |
else | |
do_processing=0; | |
fi | |
fi | |
if [ $do_processing -eq 1 ]; then | |
str= | |
for (( i = 1; i <= 4; i++ )); do | |
range=$(echo $net | cut -d '.' -f $i) | |
mask_octet=$(echo $wildcard_mask | cut -d ' ' -f $i) | |
if [ $mask_octet -gt 0 ]; then | |
range="{$range..$(( $range | $mask_octet ))}"; | |
fi | |
str="${str} $range" | |
done | |
ips=$(echo $str | sed "s, ,\\.,g"); ## replace spaces with periods, a join... | |
eval echo $ips | tr ' ' '\n' | |
else | |
exit | |
fi | |
done |
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