openwrt manual ddns update script

30-skan-ddns

#!/bin/sh

# update via ddns
# /etc/hotplug.d/iface/30-skan-ddns

[ "$INTERFACE" != "wan" ] && ( [ "$ACTION" != "ifup" ] || [ "$ACTION" != "update" ] ) && exit 0

user='username-here'
password='password-here'
token="hmac-md5:$user:$password"

host='rtr'
zone='home-okc.flame.org'
server='dns01.flame.org'

ipaddr=`ifconfig eth1 | grep 'inet addr:' | awk '{ print $2}' | cut -f2 -d:`
ipaddr6=`ifconfig eth1 | grep 'inet6 addr:' | grep Global | awk '{ print $3 }' | cut -f1 -d/`

if [ -z "$ipaddr$ipaddr6" ] ; then
	echo "Not updating as we have no external addresses"
	exit 1
fi

rm -f /tmp/ddns.$$
echo >> /tmp/ddns.$$ server $server
echo >> /tmp/ddns.$$ zone $zone.
if [ -n "$ipaddr" ] ; then
	echo >> /tmp/ddns.$$ update delete $host.$zone. A
	echo >> /tmp/ddns.$$ update add $host.$zone. 86400 A $ipaddr
fi
if [ -n "$ipaddr6" ] ; then
	echo >> /tmp/ddns.$$ update delete $host.$zone. AAAA
	echo >> /tmp/ddns.$$ update add $host.$zone. 86400 AAAA $ipaddr6
fi
echo >> /tmp/ddns.$$ show
echo >> /tmp/ddns.$$ send
cat /tmp/ddns.$$ | nsupdate -y $token -v
rm -f /tmp/ddns.$$