Google Domains DDNS registration script

ddns-start

#!/bin/sh
# see: https://github.com/RMerl/asuswrt-merlin/wiki/Custom-DDNS#google-domains
# this script could go into /jffs/scripts of a router running Merlin's asus-wrt firmware
# you must then choose the "Custom" option for DDNS in the router's web interface
# it registers the WAN IP of the router with Google Domains' DDNS system

# get your login info from yout Google Domains dashboard
IP=$1
USER=
PASS=
DOMAIN=
HOST=

curl https://$USER:$PASS@domains.google.com/nic/update?hostname=$HOST.$DOMAIN

if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1 
  echo "DDNS update done."
else
  /sbin/ddns_custom_updated 0
  echo "DDNS update failed."
fi