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Roman
Asked: 2012-01-24 06:54:47 +0800 CST

Using dd-wrt Dynamic DNS client with CloudFlare

  • 772

I'm trying to configure Dynamic DNS client on my router with dd-wrt (v24-sp2) firmware so it would dynamically change IP address in one of the DNS records. Unfortunately I encountered a problem… Here is an example request from their ddclient configuration:

https://www.cloudflare.com/api.html?a=DIUP&u=<my_login>&tkn=<my_token>&ip=<my_ip>&hosts=<my_record>

It works if I use it in browser, but in dd-wrt I get this output:

Tue Jan 24 00:36:47 2012: INADYN: Started 'INADYN Advanced version 1.96-ADV' - dynamic DNS updater. 
Tue Jan 24 00:36:47 2012: I:INADYN: IP address for alias '<my_record>' needs update to '<my_ip>' 
Tue Jan 24 00:36:48 2012: W:INADYN: Error validating DYNDNS svr answer. Check usr,pass,hostname! (HTTP/1.1 303 See Other 
Server: cloudflare-nginx 
Date: Mon, 23 Jan 2012 14:36:48 GMT 
Content-Type: text/plain 
Connection: close 
Expires: Sun, 25 Jan 1981 05:00:00 GMT 
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 
Pragma: no-cache 
Location: https://www.cloudflare.com/api.html?a=DIUP&u=<my_login>&tkn=<my_token>&ip=<my_ip>&hosts=<my_record> 
Vary: Accept-Encoding 
Set-Cookie: __cfduid=<id>; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.cloudflare.com 
Set-Cookie: __cfduid=<id>; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.www.cloudflare.com 

You must include an `a' paramiter, with a value of DIUP|wl|chl|nul|ban|comm_news|devmode|sec_lvl|ipv46|ob|cache_lvl|fpurge_ts|async|pre_purge|minify|stats|direct|zone_check|zone_ips|zone_errors|zone_agg|zone_search|zone_time|zone_grab|app|rec_se

URL from "Location" works perfectly and parameter "a" is included. What's the problem?

router ddns cloudflare

4 Answers

  1. Best Answer

    I don't think you can set it up where DD-WRT calls CloudFlare directly. The way I have it configured is to have DD-WRT call a PHP script on a remote web server, which then detects the client IP and sends the update request to CloudFlare via their API.

    DD-WRT DDNS settings

    DDNS Service: Custom
DYNDNS Server: <yourserver.com>
Username: <anything>
Password: <anything>
Host Name: <your domain name to update on cloudflare>
URL: /cloudflare_update.php?key=<your secret key>&hostname=

    cloudflare_update.php

    if(empty($_GET['key']) || ($_GET['key'] != "<your secret key>")) die;
$hostname = $_GET['hostname'];
$ip = $_SERVER['REMOTE_ADDR'];
$username = "<[email protected]>";
$api = "<your cloudflare api key>";
$curl = "https://www.cloudflare.com/api_json.html?a=DIUP&hosts=$hostname&u=$username&tkn=$api&ip=$ip";
$ch = curl_init($curl);
curl_exec($ch);
curl_close($ch);

    Instead of using HTTP basic auth I just use a random key.

    Make sure you create the DNS entry for the domain name you want to update on CloudFlare; the DIUP action parameter will only update the IP for an entry that already exists.

    • 9

  2. If you want to execute the update from your router then there is no getting around the fact that you need a little extra 'something' in the middle to convert your call into the CloudFlare format (if only DNS-O-Matic would add them to their supported services...). Rather than have to host an intermediate script yourself you can just use Google AppEngine (which is free) to do this re-posting for you. I use this:

    https://cloudflare-updater.appspot.com/

    Okay, you still have to call something other than CloudFlare to issue the update but at least you don't need to run an extra host or VPS etc. to do it yourself. It's completely transparent - only problem is that you don't get an errors returned so you need to check it's working yourself. Once it is working it should just run and run.

    • 3

  3. Noticing this is all outdated and now requires v4 api code to work.

    tested above an it fails - bad user,pass,xxxx info.

    reviewing this method https://github.com/ScottHelme/CloudFlareDDNS

    • 1

  4. Managed to get this working using this: https://github.com/dcerisano/Cloudflare-dynamic-dns

    Once you have your Cloudflare account setup the info required is easy to locate:

    You need: Zone ID

    Authorization key (aka Global api key)

    A-record ID for your domain (this is obtained by running the cloudflare-dns-id.sh script) I had to trim the script a little to make it work..

    curl -X GET "https://api.cloudflare.com/client/v4/zones/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/dns_records?type=A&name=dynamic" \ -H "X-Auth-Email: [email protected]" \ -H "X-Auth-Key: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" \ -H "Content-Type: application/json"

    I stored both scripts in /jffs making them executable.

    In terms of the Cloudflare side of things, I setup as per this guide for just the Cloudflare domain records:

    https://support.opendns.com/hc/en-us/community/posts/115000937008-How-to-set-up-DNS-O-MATIC-for-Cloudflare-and-the-other-way-around-and-a-FritzBox

    At Cloudflare you must set the following records:

    • Type: A | Name: dynamic | Value: “your WAN IP” ***

    • Type: CNAME | Name: “yourdomain.xyz” | Value: dynamic.”yourdomain.xyz”

    • Type: CNAME | Name: www | Value: “yourdomain.xyz”

    I setup a cron job to run cloudflare-ddns.sh every 5 minutes to check for IP changes.

    My DD-WRT router now auto updates Cloudflare whenever the WAN IP is changed...

    The above takes about 10 minutes to setup.

    • 1