#!/bin/bash
# dnscheck.sh
# usage: dnscheck.sh domainname.tld
# Check all DNS servers for $1 domain and show serial number
# Written by FrankB@FrankB.us 09/06/07

if [ ! $1 ]; then
   echo "missing domain name"
   echo "usage:  dnsreport domainname.tld"
else
   master_server=`dig $1 soa | grep SOA | grep -v "^;" | awk '{print $5}'`
   echo "$master_server is master NS for $1"
   master_serial=`dig @$master_server $1 soa | grep SOA | grep -v "^;" | awk '{print $7}'`
   dig @$master_server $1 ns | grep NS | grep -v "^;" | awk '{print $5}' > /tmp/ns-list$$
   echo "Server:			Serial:"
   for server in `cat /tmp/ns-list$$`; do
      echo -n " $server	"
      serial=`dig @$server $1 soa | grep SOA | grep -v "^;" | awk '{print $7}'`
      if [ -z $serial ]; then 
	 if [ -u /usr/bin/fping ]; then
            echo "no response, `fping $server`"
	 else
            echo "no response"
	 fi
      elif [ $master_serial = $serial ]; then
         echo "$serial"
      else
         echo "$serial Out of Sync"
      fi
   done
   /bin/rm -f /tmp/ns-list$$
fi