dyndns-cloudflare-updater

A lightweight PHP script that updates your dns records at Cloudflare when pinged by your router.

You will need:

• A Cloudflare account (it doesn't matter whether it's free or a paid plan)
• A webspace with PHP support (just for this script)
• A router that can ping this updater (tested with FRITZ!Box 7490 by AVM)

Configuration

Step 1: Get your token

First of all you need a Cloudflare API token with specified permissions:

• Zone / DNS / Edit
• Zone / DNS / Read

Select your zone in Zone Resources:

• Include / Specific zone / example.com

For security reasons it's recommended limit the access to your webserver's ip in "Client IP Address Filtering". You can copy and paste the token in the $config array (token).

Step 2: Set up your domain

Stay logged in on Cloudflare! After that you need to create A and AAAA records (e.g. dyndns.example.com) and you have to copy the Zone ID. The Zone ID is shown on the domain overview. You can adapt the Zone ID into the $config array.

Step 3: Set up your router

Finalize the updater by inserting the credentials on your router settings. User and password are stored unencrypted and without any hash in the $config array because the routers pass them on as a get variable anyway... The URL should look like this:

    https://example.com/updater.php?user=<username>&password=<pass>&host=<domain>&ip=<ipaddr>&ip6=<ip6addr>