#!/bin/ksh
#############################################################
#
#   NSSCAN: scans a b or c class ip range for names
#
#   Chuck Geigner: Nov 12, 2001
#
#   Copyleft 2001. Distribute this script in its entirety as
#   you wish, keeping all attributions.
#

OUTFILE="/tmp/nsscan.log"
USAGE="Usage: nsscan -[B|C] ipaddr [-s [/path/file]]\
OR:    nsscan -d"

if [ $# -lt 2 -a "$1" != "-d" ]; then
   echo "Needs 2 args. "
   echo $USAGE
   exit
fi
if [ ! -f /usr/bin/nslookup -o ! -f /bin/nslookup ]; then
   echo "Missing prerequisite: nslookup"
   exit
fi

Q1=`echo $2 | cut -d. -f1`
Q2=`echo $2 | cut -d. -f2`
Q3=`echo $2 | cut -d. -f3`
Q4=`echo $2 | cut -d. -f4`

if [ $# -gt 2 ]; then
   if [ "$3" = "-save" -o "$3" = "-s" ]; then
      if [ $# -eq 4 ]; then
         OUTFILE="$4"
      elif [ $# -gt 4 ]; then
         echo "extraneous values given:\c"
         CT=$#
         set -A ARGS "$@"
         while [ $CT -gt 3 ]
         do
            CT=`expr $CT - 1`
            echo ${ARGS[$CT]}
         done
         echo "\n\c"
         exit
      else
         echo "Enter name of output file: \c"
         read OUTFILE
      fi
   fi
fi
if [ "$1" = "-B" ]; then
   cat /dev/null > $OUTFILE
   Q4=255
   Q3=255
   echo "scanning B-class network $Q1.$Q2.0.0..."
   echo "Proceed? (y/n): \c"
   read GATE
   if [ "$GATE" = "y" -o "$GATE" = "Y" ]; then
      while [ $Q3 -ge 0 ]
      do
         while [ $Q4 -ge 0 ]
         do
            VAR=`nslookup $Q1.$Q2.$Q3.$Q4|grep -v ddress|grep -v Server|cut -d: -f2|sed "s/ //g"`
            echo "$VAR    $Q1.$Q2.$Q3.$Q4\c" >> $OUTFILE
            Q4=`expr $Q4 - 1`
         done
         Q4=255
         Q3=`expr $Q3 - 1`
      done
   else
      echo "Aborting B-class scan..."
      exit
   fi

elif [ "$1" = "-C" ]; then
   cat /dev/null > $OUTFILE
   Q4=0
   echo "scanning C-class network $Q1.$Q2.$Q3.0..."
   while [ $Q4 -le 255 ]
   do
      VAR=`nslookup $Q1.$Q2.$Q3.$Q4|grep -v ddress|grep -v Server|cut -d: -f2|sed "s/ //g" 2>/dev/
null`
      if [ -n "$VAR" ]; then
         echo "$VAR\t\t$Q1.$Q2.$Q3.$Q4\c" >> $OUTFILE
      fi
      Q4=`expr $Q4 + 1`
   done

elif [ "$1" = "-display" -o "$1" = "-d" ]; then
   if [ ! -f $OUTFILE ]; then
      echo "$OUTFILE: File not found."
      exit
   else
      more $OUTFILE
   fi

else
   echo $USAGE
   exit
fi