#!/bin/sh
# Rebuilds subnets with subnetmask to CIDR style
# M.W. Baurichter (c) 2005  v.02

if [ $# -lt 1 ];
then
 clear
 echo ">> No file given"
 echo ">> Need file in syntax xxx.xxx.xxx.xxx nnn.nnn.hhh.hhh"
 echo ">> where xxx.xxx.xxx is IP addresss and nnn.nnn.hhh.hhh is subnet mask"
 echo ""
 exit 0;
fi

if [ -e rebuild.txt ]
then
   mv rebuild.txt rebuild.old
fi

echo -n "Checking if IP Addresses are valid ..."
for i in `awk '{print $1}' $1`
do
 GREP_PARAM="^[[:digit:]]*\.[[:digit:]]*\.[[:digit:]]*\.[[:digit:]]*"
 IPF=`echo $i | grep -c $GREP_PARAM`
if [ $IPF == 0 ] ; then
        echo -e "Failed: Invalid IP address ($i)!"
        exit 1
fi
done
echo " Done"

echo -n "Creating CIDR file ..."
for i in `awk ' /255./ {print $1"/"$2} ' $1`
do 
 ip=`echo $i|cut -d "/" -f1`
 cidr=`/usr/local/bin/whatmask $i|grep CIDR|cut -d " " -f4`
 echo $ip$cidr >> rebuild.txt
done

echo " Done"
echo "File saved as rebuild.txt"