#! /bin/bash

# This script is used on the dns server to do the actual update of the zone file

zone=""
subdomain=""
old_ipv4=$(dig +short a ${subdomain} @127.0.0.1)
new_ipv4=$(cat /var/www/dnsping/tmp/ipv4_address)
old_ipv6=$(dig +short aaaa ${subdomain} @127.0.0.1)
new_ipv6=$(cat /var/www/dnsping/tmp/ipv6_address)

if [ "$new_ipv4" != "$old_ipv4" ] || [ "$new_ipv6" != "$old_ipv6" ];
then
	nsupdate -l << EOF
zone $zone
update delete ${subdomain} A
update delete ${subdomain} AAAA
update add ${subdomain} 10 A $new_ipv4
update add ${subdomain} 10 AAAA $new_ipv6
show
send
EOF
        logger "Updated dynamic IPv4 address from $old_ipv4 to $new_ipv4"
        logger "Updated dynamic IPv6 address from $old_ipv6 to $new_ipv6"
fi