Linode PHP Dydns Server

A Dydns server using the Linode API based on the work of

• Nico Kaiser https://github.com/nicokaiser/Dyndns
• and Travis Maynard https://travismaynard.com/writing/dynamic-dns-using-the-linode-api

Implements a Dyndns compatible server

• https://help.dyn.com/remote-access-api/perform-update/
• https://help.dyn.com/remote-access-api/return-codes/

##On your Linode

• go to the DNS manager and create a A/AAA record e.g. home.example.com
• go to Accounts/Users and Permisions and create a new user https://manager.linode.com/user/edit
• set the user to a restricted user "Yes - this user can only do what I specify"
• go to Accounts/Users Edit Permisions and disable all permissions except "DNS Zone Grants" for the domain e.g. example.com
• login into the linode as the new user and create an API key using "my profile" "API Keys" https://manager.linode.com/profile/api

##Obtaining your Linode DomainID and Resource ID

To find your Domain ID, simply paste your API key into the following URL and view it in your browser. https://api.linode.com/?api_key=your-api-key&api_action=domain.list

This will return a JSON object listing all of the domains that are registered on your Linode account. Simply locate the domain that you will be using for dynamic dns and take note of the value in the DOMAINID property.

To find your Resource ID, simply input your API key and your newly obtained Domain ID in the following URL and view it in your browser. https://api.linode.com/?api_key=your-api-key&api_action=domain.resource.list&domainid=your-domain-id

This will also return a JSON object. Find the record that contains the A/AAA record you created using the linode DNS manager and note the Resource ID.

##Installation

nic subfolder

Create a subfolder nic on your web server WWW folder e.g. http://www.example.com/nic

Change directory to the nic folder.

Install Composer

sudo apt-get update
sudo apt-get install curl php5-cli git
curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/local/bin --filename=composer

Add Dyndns as a dependency

composer require mhornsby/dyndns:*

Setup the nic folder

cp vendor/mhornsby/dyndns/nic/update.php .
cp vendor/mhornsby/dyndns/nic/htaccess .htaccess

Setup /etc/dyndns

sudo mkdir /etc/dyndns`
sudo cp -r vendor/mhornsby/dyndns/etc:dyndns /etc/dyndns`
cd /etc/dyndns

• setup linode.api_key enter the Linode API key into
• setup linode.resourceid e.g. home.example.com:your-resource-id
• setup linode.domainidid e.g. *.example.com:your-domainid-id
• setup dyndns.host e.g. *.example.com:user1
• setup dyndns.user e.g. htpasswd -c -d /etc/dyndns/dyndns.user user1

Testing

Test your setup with http://user1:[email protected]/nic/update?hostname=home.example.com&myip=1.2.3.4

Dyndns Return Codes

• good The update was successful, and the hostname is now updated.
• badauth The username and password pair do not match a real user.
• notfqdn The hostname specified is not a fully-qualified domain name (not in the form hostname.dyndns.org or domain.com).
• nohost The hostname specified does not exist in this user account (or is not in the service specified in the system parameter)
• badagent The user agent was not sent or HTTP method is not permitted (we recommend use of GET request method).
• dnserr DNS error encountered
• 911 There is a problem or scheduled maintenance on our side.

Debug

Debuging is enabled by default in nic/update.php via these two lines

->setConfig('debug', true)  // enable debugging
->setConfig('debugFile', '/tmp/dyndns.log') // debug file

Implemented fields

• hostname Comma separated list of hostnames that you wish to update (up to 20 hostnames per request). This is a required field. Example: hostname=dynhost1.yourdomain.tld,dynhost2.yourdomain.tld myip` IP address to set for the update. Defaults to the best IP address the server can determine.