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#!/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.$$
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.