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DynDNS and IPv6

Hi there!

Is it possible to update a freedns.afraid.org AAAA record with the IP of the UTM External interface?
If yes: How?

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0 scorpionking over 11 years ago

Well, with freedns.afraid.org it's quite easy as you can simply call an update URL:

freedns.afraid.org/.../update.php&address=1111:2222::ffff

So I wrote a little shell script which runs every 5 minutes (via cron) and checks if the registered IPv6 IP is the same as the newest one from UTM's WAN interface (eth1 in my case):

#!/bin/sh
#FreeDNS updater script

INTERFACE=eth1
UPDATEURLBASE="freedns.afraid.org/.../update.php&address="
DOMAIN=""
IPV6REGEX="((([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{7}(([0-9A-Fa-f]{1,4})|[[[[[[[[:)]]]]]]]])|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{6}(:|((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})|(:[0-9A-Fa-f]{1,4})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{5}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{4}(:[0-9A-Fa-f]{1,4}){0,1}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{3}(:[0-9A-Fa-f]{1,4}){0,2}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{2}(:[0-9A-Fa-f]{1,4}){0,3}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]](:[0-9A-Fa-f]{1,4}){0,4}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|([[[[[[[:(]]]]]]]:[0-9A-Fa-f]{1,4}){0,5}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))(%.+)?"

registered=$(nslookup -q=AAAA $DOMAIN|grep $DOMAIN|grep AAAA|egrep -i -o $IPV6REGEX)

current=$(ip -f inet6 addr show $INTERFACE|egrep -i -o "inet6.*scope global dynamic"|egrep -i -o $IPV6REGEX)

logger $0: "Running FreeDNS IPv6 Updater Script for hostname $DOMAIN..."
logger $0: "Current IPv6 of interface $INTERFACE is $current"

if [ "$current" != "$registered" ]; then
     logger $0: "This doesn't match the registered IPv6 address ($registered). Calling update URL..."
     updateurl=$UPDATEURLBASE$current
     wget -q -O /dev/null $updateurl
     logger $0: "Done."
else
     logger $0: "This matches the registered IPv6 address. Doing nothing."
fi

Don't be scared by the very long RegEx expression, it is to check that only the IPv6 address is grep'ed and nothing else.

So far this is working well. The future will show if I have to tweak my script further...

Reply

0 scorpionking over 11 years ago

Well, with freedns.afraid.org it's quite easy as you can simply call an update URL:

freedns.afraid.org/.../update.php&address=1111:2222::ffff

So I wrote a little shell script which runs every 5 minutes (via cron) and checks if the registered IPv6 IP is the same as the newest one from UTM's WAN interface (eth1 in my case):

#!/bin/sh
#FreeDNS updater script

INTERFACE=eth1
UPDATEURLBASE="freedns.afraid.org/.../update.php&address="
DOMAIN=""
IPV6REGEX="((([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{7}(([0-9A-Fa-f]{1,4})|[[[[[[[[:)]]]]]]]])|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{6}(:|((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})|(:[0-9A-Fa-f]{1,4})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{5}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{4}(:[0-9A-Fa-f]{1,4}){0,1}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{3}(:[0-9A-Fa-f]{1,4}){0,2}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]]{2}(:[0-9A-Fa-f]{1,4}){0,3}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(([0-9A-Fa-f]{1,4}[[[[[[[[:)]]]]]]]](:[0-9A-Fa-f]{1,4}){0,4}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|([[[[[[[:(]]]]]]]:[0-9A-Fa-f]{1,4}){0,5}(([[[[[[[:(]]]]]]](25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|((:[0-9A-Fa-f]{1,4}){1,2})))|(((25[0-5]|2[0-4]\d|[01]?\d{1,2})(\.(25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))(%.+)?"

registered=$(nslookup -q=AAAA $DOMAIN|grep $DOMAIN|grep AAAA|egrep -i -o $IPV6REGEX)

current=$(ip -f inet6 addr show $INTERFACE|egrep -i -o "inet6.*scope global dynamic"|egrep -i -o $IPV6REGEX)

logger $0: "Running FreeDNS IPv6 Updater Script for hostname $DOMAIN..."
logger $0: "Current IPv6 of interface $INTERFACE is $current"

if [ "$current" != "$registered" ]; then
     logger $0: "This doesn't match the registered IPv6 address ($registered). Calling update URL..."
     updateurl=$UPDATEURLBASE$current
     wget -q -O /dev/null $updateurl
     logger $0: "Done."
else
     logger $0: "This matches the registered IPv6 address. Doing nothing."
fi

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