DNS Zone Serial Numbers

Wed Sep 16 15:42:06 UTC 1998

Come on jim, you can always run MacDNS 1.0.4 right?  Then do an applescript
to change it for you.

Sorry everyone I couldnt resist being a another MacOS user.  I think jim
also bought a new iMac...

Dave

At 3:25 PM -0000 9/16/98, James R. Cutler wrote:
>As long as one is interested in DNS zone SOA record serial numbers,
>it is convenient to use the following script to simplify the user
>interface and view.  Of course, this assumes an operating system
>with a shell.  I would love a translation to perl so I could run
>it on my MacOS machine. :)
>
>	JimC
>
><cut to here>
>#!/bin/sh
>if test "$1" = ""
>then
>    echo usage: $0 domain
>    exit 1
>fi
>DOMAIN=$1
>#
># Use nslookup to discover the nameservers for this domain ($1).
># Use awk to grab the name server names from the nameserver lines.
># (The names are always in the last field).  Use sort -u to weed out
># duplicates; we don't actually care about collation.
>#
>SERVERS=`nslookup -type=ns $DOMAIN |\
>                 awk '/nameserver/ {print $NF}' | sort -u`
>if test "$SERVERS" = ""
>then
>    #
>    # Didn't find any servers.  Just quit silently; nslookup will
>    # have detected this error and printed a message.  That will
>    # suffice.
>    #
>    exit 1
>fi
>#
># Check each server's SOA serial number.  The output from
># nslookup is saved in two tmp files: nso.$$ (standard output)
># and nse.$$ (standard error).  These files are rewritten on
># every iteration.  Turn off defname and search since we
># should be dealing with fully qualified names.
>#
># NOTE: this loop is rather long; don't be fooled.
>#
>for i in $SERVERS
>do
>  nslookup >/tmp/nso.$$ 2>/tmp/nse.$$ <<-EOF
>    server $i
>    set nosearch
>    set nodefname
>    set norecurse
>    set q=soa
>    $DOMAIN
>EOF
>  #
>  # Does this response indicate that the current server ($i) is
>  # authoritative?  The server is NOT authoritative if (a) the
>  # response says so, or (b) the response tells you to find
>  # authoritative info elsewhere.
>  #
>  if egrep "Non-authoritative|Authoritative answers can be" \
>                                          /tmp/nso.$$ >/dev/null
>  then
>    echo $i is not authoritative for $DOMAIN
>    continue
>  fi
>  #
>  # We know the server is authoritative; extract the serial number.
>  #
>  SERIAL=`cat /tmp/nso.$$ | grep serial | sed -e "s/.*= //"`
>  if test "$SERIAL" = ""
>  then
>    #
>    # We get here if SERIAL is null.  In this case, there should
>    # be an error message from nslookup; so cat the "standard
>    # error" file.
>    #
>    cat /tmp/nse.$$
>  else
>    #
>    # Report the server's name and its serial number.
>    #
>    echo $i has serial number $SERIAL
>  fi
>done  # end of the "for" loop
>#
># Delete the temporary files.
>#
>rm -f /tmp/nso.$$ /tmp/nse.$$
>-
>James R. Cutler
>EDS , 800 Tower Drive, Troy, MI 48098
>Phone: +1 248 265 7514   FAX: +1 248 265 7514
>EDS Internal Web: <http://www.iscg.eds.com/cutler/>
>World Wide Web: <http://www.ltu.edu/midecus/dechtm/cutler/cutler.htm>

Thank you,
David Diaz
Chief Technical Officer
Netrail, Inc

email:   davediaz at netrail.net
pager: 888-576-1018
office: 888-NETRAIL

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