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Full Discussion: DNS circular verify script
Top Forums Shell Programming and Scripting DNS circular verify script Post 302800815 by snoman1 on Tuesday 30th of April 2013 02:41:21 PM
Old 04-30-2013
DNS circular verify script
I have modified a script to do a circular DNS look up.

The theory is this
for a given subnet build a range if IP's
do a reverse look up on those IP's
take the output of the reverse look up then and do a forward look up
If the returns match up give a good status
If not return a fail status.

It runs really nice except when it runs into multi-homed IP's.
I am now trying to script in to check if the reverse lookup returns more than one entry, and if so then do a look up on any returns.

Any ideas?

Code:
#!/bin/bash
# Update NETS as needed
#
NETS="00.000.000"
echo
echo "STATE   ADDRESS -------> NAME -------------------> ADDRESS"
echo '-------------------------------------------------------------------'
for NET in $NETS; do
  for n in $(seq 1 254); do
    A=${NET}.${n}                    # builds the range of the subnet
    HOST=$(dig -x $A +short)         # reverse lookup
    if test -n "$HOST"; then         # If string has nonzero length then continue

      for MULTI in `dig +short  -x $HOST`; do
      ADDR=$(dig $HOST +short)       # Now do forward lookup
 done
      if test "$A" = "$ADDR"; then   # if host = IP, then mark it as OK
        echo -e "ok\t$A -> $HOST -> $ADDR"
      elif test -n "$ADDR"; then
        echo -e "fail\t$A -> $HOST -> $ADDR"
      else
        echo -e "fail\t$A -> $HOST -> [unassigned]"
      fi
    fi
  done
done
echo DONE
exit 0

 

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LEARN ABOUT DEBIAN

inetutils-ifconfig

IFCONFIG(1)							   User Commands						       IFCONFIG(1)

NAME

       ifconfig - configure network interfaces

SYNOPSIS

       ifconfig [OPTION...]

DESCRIPTION

	      NAME [ADDR] [broadcast BRDADDR] [pointopoint|dstaddr DSTADDR]

	      [netmask MASK] [metric N] [mtu N] [txqueuelen N] [up|down] [FLAGS]

       Configure network interfaces.

       -a, --all
	      display all available interfaces

       -A, --address=ADDR
	      set interface address to ADDR

       -B, -b, --broadcast=ADDR, --brdaddr=ADDR
	      set broadcast address to ADDR

       -d, -p, --dstaddr=ADDR, --peer=ADDR
	      set destination (peer) address to ADDR

       --down shut the interface down

       --format=FORMAT
	      select output format (or set back to default)

       -F, --flags=FLAG[,FLAG...] set interface flags

       -i, --interface=NAME
	      configure network interface NAME

       -m, --netmask=MASK
	      set netmask to MASK

       --metric=N
	      set metric of interface to N

       -M, --mtu=N
	      set mtu of interface to N

       -s, --short
	      short output format

       --up   activate the interface (default if address is given)

       -v, --verbose
	      output information when configuring interface

	      Linux-specific options

       -T, --txqlen=N
	      set transmit queue length to N

       -?, --help
	      give this help list

       --usage
	      give a short usage message

       -V, --version
	      print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

       Known flags are: allmulti, automedia, debug, loopback, multicast, portsel, running, trailers, up

AUTHOR

       Written by Marcus Brinkmann.

REPORTING BUGS

       Report bugs to <bug-inetutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for ifconfig is maintained as a Texinfo manual.  If the info and ifconfig programs are properly installed at your
       site, the command

	      info ifconfig

       should give you access to the complete manual.

GNU inetutils 1.9						   December 2011						       IFCONFIG(1)
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