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@cyrusboadway
Created February 20, 2016 17:21
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Script to update a Google Domains DNS record
#!/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
@wluo
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wluo commented Oct 5, 2019

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

@rafex
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rafex commented Oct 23, 2019

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

@jaddriggers
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jaddriggers commented Dec 20, 2019

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

@rip057
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rip057 commented Feb 10, 2020

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=$(curl -s --data-urlencode "hostname=@.domain.com" --data-urlencode "myip=$currentipaddress" -H "Host: domains.google.com" -u "$username:$password" "https://domains.google.com/nic/update")

echo "$curloutput" to wherever you want

@AdamKearn
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AdamKearn commented May 20, 2020

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:password@domains.google.com/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

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ghost commented Dec 8, 2020

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

@Dayday10
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A stare is born

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

@cyrusboadway
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Author

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

@AdamKearn
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AdamKearn commented Jun 18, 2024 via email

@cyrusboadway
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cyrusboadway commented Jun 18, 2024

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.

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