ddns-add

#!/bin/bash
#
# This script adds a dynamic DNS entry for the host in the name servers. If the system is not joined to the domain, it uses the old nsupdate method.

#if [ `hostname | cut -b1` != "w" ]; then
#	exit
#fi


# WAIT

sleep $[ ( $RANDOM % 30 ) + 1 ]s

# Check for the correct interface and only output the correct one.
DFTETH=`ip route | grep default | awk '{print $5}'`

for i in $DFTETH; do
#	INTIP=`( ifconfig $i | grep "inet addr" | awk -F: '{print $2}' | head -n 1 | awk '{print $1}' ) 2> /dev/null`
	INTIP=`( ip route | grep "$DFTETH" | grep "src" | awk '{print $9}' ) 2> /dev/null`
	
	if [ $INTIP ]; then
		IP=$INTIP
		continue
	fi

done


# exit if hostname=localhost so we don't break windows. 
HN=`hostname | awk -F. '{print $1}'`
if [ ${HN} == "localhost" ]; then
	echo "hostname is localhost, failing"
        exit 1
fi


function oldupdate ()
{
        REVIP=`/sbin/ifconfig | grep "inet addr" | awk -F: '{print $2}' | head -n 1 | awk '{print $1}' | awk -F. '{print $4 "." $3 "." $2 "." $1 ".in-addr.arpa."}'`
        if [ ${HN} == "localhost" ]; then
                echo "Failed"
                exit 1
        fi
        SERVERS=`grep nameserver /etc/resolv.conf | awk '{print $2}'`
        for i in `echo $SERVERS`; do
                echo "server $i
                zone $DOMAIN
                update delete $HN.$DOMAIN A
                update add $HN.$DOMAIN 86400 A $IP
                send
                " | nsupdate 2> /dev/null

                echo "server $i
                update delete $REVIP PTR
                update add $REVIP 86400 PTR $HN.$DOMAIN
                send
                " | nsupdate 2> /dev/null
        done
}

function ddns-update ()
{
if [ -f /usr/share/centrifydc/libexec/addns ]; then
	if [ $ADVER == 5 ]; then
		echo "#################" >> /var/log/ddns-add.log
		echo $(date)  >> /var/log/ddns-add.log		
		echo "#################" >> /var/log/ddns-add.err
		echo $(date)  >> /var/log/ddns-add.err		
		echo "Running addns with force switch, check=$CHECK, IP=$IP, HN=$HN, DOMAIN=$DOMAIN" >> /var/log/ddns-add.log
		/usr/share/centrifydc/libexec/addns -UVmf -i $IP -d $DOMAIN 2>> /var/log/ddns-add.err >> /var/log/ddns-add.log
	else
		echo "#################" >> /var/log/ddns-add.log
                echo $(date) >> /var/log/ddns-add.log
		echo "#################" >> /var/log/ddns-add.err
                echo $(date) >> /var/log/ddns-add.err
		echo "Running addns without force switch" >> /var/log/ddns-add.log
		/usr/share/centrifydc/libexec/addns -UVm -i $IP -d $DOMAIN 2>> /var/log/ddns-add.err >> /var/log/ddns-add.log
	fi
fi


}

# check for adinfo
ADINFO=$(which adinfo 2> /dev/null)
if [ ! -f "$ADINFO" ]; then
	oldupdate
	exit
fi

# check for centrify version
ADVER=$(adinfo -v | awk '{ print $3}' | awk -F. '{print $1}')

# check to make sure we are joined to a zone
ZONE=`$ADINFO -z | awk -F\/ '{print $4}'`
if [ ! "$ZONE" ]; then
	oldupdate 
	exit
fi
DOMAIN=`/usr/bin/adinfo -d`

if [ "$ZONE" ] && [ "$IP" ]; then
	ddns-update
	COUNT=0
	while [ $COUNT -lt 10 ]; do
		TIMERTEST=`tail /var/log/ddns-add.err | grep -i time | grep -v "ADDNS TCP Timeout value"`
		if [ ! -z "$TIMERTEST" ]; then
	                sleep 10
	                ddns-update
		else
			exit
		fi
		let COUNT=COUNT+1
	done
	if [ $COUNT -gt 2 ]; then
		echo "found - $TIMERTEST" | mail -s "DNS update failed for `hostname` $COUNT times" test@example.com
	fi


fi