ASUS Merlin Google DDNS script (/jffs/scripts/ddns-start)

ddns-start

#!/bin/sh

host=
user=
pass=

wanip=$1
resolvedip=$(nslookup $host | grep $host -A1 | awk '/^Address / {print $3}')

if [ "$wanip" == "$resolvedip" ]; then
      logger "Google Domains DDNS: WAN IP ($wanip) unchanged, no update necessary"
      /sbin/ddns_custom_updated 1
else
        response=$(curl -s https://$user:$pass@domains.google.com/nic/update?hostname=$host&myip=$wanip)
        if [ "$response" == "good $wanip" ]; then
            logger "Google Domains DDNS: DNS updated to $wanip from $resolvedip"
            /sbin/ddns_custom_updated 1
        else
            logger "Google Domains DDNS: Update error. $response"
            /sbin/ddns_custom_updated 0
        fi
fi