Script to update a Google Domains DNS record

google-domains-dynamic-dns-update.sh

#!/bin/bash

### Google Domains provides an API to update a DNS "Syntheitc record". This script
### updates a record with the script-runner's public IP, as resolved using a DNS
### lookup.
###
### Google Dynamic DNS: https://support.google.com/domains/answer/6147083
### Synthetic Records: https://support.google.com/domains/answer/6069273

USERNAME=""
PASSWORD=""
HOSTNAME="yoursubdomain.yourdomain.here"

# Resolve current public IP
IP=$( dig +short myip.opendns.com @resolver1.opendns.com )
# Update Google DNS Record
URL="https://${USERNAME}:${PASSWORD}@domains.google.com/nic/update?hostname=${HOSTNAME}&myip=${IP}"
curl -s $URL

Should it work the same way if my agent has a n IPv6 address? Because it doesn't seem to work for me.

The documentation suggests the API supports IPv6 updates.

https://support.google.com/domains/answer/6147083

You may need to modify the script to url-encode the ip address (the colons in particular). Rather than composing the Url as a single string, you could add the data parameters component through curl's method, which will do the encoding:

curl --data-urlencode "myip=${IP}" https://domains.google.com/etc.

https://curl.haxx.se/docs/manpage.html#--data-urlencode

Thanks for the quick response.
The .sh script works and returns "good 'my IPv6 address'".
However my domain only works if I am connected in the same network as the server. But is a type my IPv4 address in a browser on a device that is not in the same network it actually works.

I don't know what's the problem.

@rafaelfranco-vera

This will make it IP4
IP=$( curl -4s "https://domains.google.com/checkip" )

Bonus! Clean output
curl -sw '\n' $URL

I think it would be slightly more secure to do this so your username and password are not in plain text (url) provided you're making an HTTPS request:
curl --user ${USERNAME}:${PASSWORD} -s $URL

I did something similar with python, avoiding calls from google domains. Today I have the script running every 5 minutes.

https://github.com/rafex/updateGoogleDomains

I'm getting badagent when trying to run in macosx terminal
Nevermind fixed it. Changed to use Google domains to get IP

only posting here because i was drawn in by the search engine... never transmit your username and password in anything but TLS and proper TLS... dont be a fool its not worth it in the end.
you can use this for ip address retrieval

currentipaddress="$(wget -q -O - checkip.dyndns.org | sed -e 's/.Current IP Address: //' -e 's/<.$//')"

or you can use this if you are directly connected... change to your correct network interface though

currentipaddress="$(ifconfig eth1 | grep -o "inet addr:([0-9]{1,3}.){3}[0-9]{1,3}" | sed 's/inet addr://')"

and this is the curl request that i have formed and it works perfectly everytime.

curloutput=$(curl -s --data-urlencode "[email protected]" --data-urlencode "myip=$currentipaddress" -H "Host: domains.google.com" -u "$username:$password" "https://domains.google.com/nic/update")

echo "$curloutput" to wherever you want

I know this is an old thread but you can just send a request to the URL and not include the IP just pass the username and password.
The API will then use the IP the request was sent from.

e.g.
curl https://username:[email protected]/nic/update?hostname=subdomain.yourdomain.com

For more details see the section at the bottom of this page labelled "Using the API to update your Dynamic DNS record"
https://support.google.com/domains/answer/6147083?hl=en-GB

I had to change line 15 to IP=$( curl ifconfig.me ). Other than that the script works.

https://username:[email protected]/nic/update?hostname=subdomain.yourdomain.com

A stare is born

Does anyone know if there is an update to this to work with Squarespace since Google Domains has retired?

Squarespace does not offer an API for DNS configuration. There is no practical mechanism to programmatically manage dynamic DNS records for domains they manage.

I’m a bit confused why you need DDNS for squarespace? Isn’t that a static address? I recommend transferring your domains over to cloudflare. They do have an API you can use. I found a project called DDClient on GitHub that you can run every hour to update your record.

…

On Sun, 16 Jun 2024 at 2:37 PM, jlrosssc ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Does anyone know if there is an update to this to work with Squarespace since Google Domains has retired? — Reply to this email directly, view it on GitHub <https://gist.github.com/cyrusboadway/5a7b715665f33c237996#gistcomment-5090553> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHJNB2YH4LN3UCX4NQ3X6P3ZHWIKZBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVAZTCNJVHE2TAONHORZGSZ3HMVZKMY3SMVQXIZI> . You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .

Squarespace has a registrar & DNS business, independent of their hosting services: https://domains.squarespace.com

Squarespace purchased all Google Domains registrations: https://support.google.com/domains/answer/13689670

Any users whose domain registrations were transferred with the purchase would need to find a new registrar if they want a DDNS API.