#!/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 and source available
#   freely and without charge, in accordance with the LGPL.
#   see here: http://www.gnu.org/licenses/lgpl.txt 
#  
#   27May03: added whois scan, helpfile and speed control

VER="0.1.4 alpha"
VERSTR="nsscan Ver. $VER.\
(c) Chuck Geigner, http://chux0r.org"

USAGE="\nUsage: \tnsscan -[B|C] ipaddr [-s [/path/file]] \n\
OR: \tnsscan -[d|h] --(use nsscan -h for help)--"
USAGE2="\nExamples: \n\
To scan the C class range of IP's 10.5.60.0 (technically, CIDR 10.5.60.0/24):\n\
\t$ nsscan -c 10.5.60.0&\n\
To review the results of the scan:\n\
\t$ nsscan -d\n"

# Speeds: 1=slow/complete 2=med/med 3=fast
SPEED=1

OUTFILE="/tmp/nsscan.log"

if [ "$1" = "-display" -o "$1" = "-d" -o "$1" = "--display" ]; then
   if [ ! -f $OUTFILE ]; then
      echo "$OUTFILE: File not found."
      exit
   else
      more $OUTFILE
      exit
   fi
elif [ "$1" = "-help" -o "$1" = "-h" -o "$1" = "--help" ]; then
   echo $USAGE
   echo $USAGE2
   exit 
fi
if [ $# -lt 2 ]; then
   echo "nsscan 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 - ${SPEED}`
            echo ${ARGS[$CT]} 
         done
         echo "\n\c"
         exit
      else
         echo "Enter name of output file: \c"
         read OUTFILE
      fi
   fi
fi

cat /dev/null > $OUTFILE
echo ${VERSTR} >> $OUTFILE

if [ "$1" = "-B" -o "$1" = "-b" ]; then
   Q4=255
   Q3=255
   echo "scanning B-class network $Q1.$Q2.0.0..."
   whois -h whois.arin.net $Q1.$Q2.0.0 2> /dev/null >> $OUTFILE
      while [ $Q3 -ge 0 ]
      do
         while [ $Q4 -ge 0 ]
         do
            VAR=`nslookup $Q1.$Q2.$Q3.$Q4 2> /dev/null |\
                 grep -v ddress |\
                 grep -v Server|\
                 cut -d: -f2|\
                 sed "s/ //g"`
            echo "$VAR    $Q1.$Q2.$Q3.$Q4\c" >> $OUTFILE 
            Q4=`expr $Q4 - ${SPEED}`
         done
         Q4=255
         Q3=`expr $Q3 - ${SPEED}`
      done
      echo "nsscan $Q1.$Q2.0.0 scan complete."
      exit

elif [ "$1" = "-C" -o "$1" = "-c" ]; then
   Q4=0
   echo "scanning C-class network $Q1.$Q2.$Q3.0..."
   whois -h whois.arin.net $Q1.$Q2.$Q3.0 2> /dev/null >> ${OUTFILE} 
   while [ $Q4 -le 255 ]
   do
      VAR=`nslookup $Q1.$Q2.$Q3.$Q4 2> /dev/null |\
           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 + ${SPEED}`
   done
   echo "nsscan $Q1.$Q2.$Q3.0 scan complete."
   exit

else
   echo $USAGE
   exit 
fi