tinydnsdyn: Dynamic DNS for ‘djbdns’

This is a basic dynamic client and server for the djbdns DNS server ‘tinydns’ by Dan Bernstein.

Requirements:

• Administrative access to a server running tinydns and hence daemontools or similar
• Administrative access to a *nix box on you local network
• Python installed on both client and server

Installation

Server

To install the server code:

1. Copy script and all files onto your server (i.e. /etc/tinydnsdyn/)
2. The supplied ‘run’ script is tailored for debian/ubuntu and may need to be changed.
3. Create a password file that contains the password on the first line
4. Start the service by symlinking this directory into your svscan directory (i.e. “ln $(pwd) /etc/service/” ).
5. An existing entry in the tinydns data file should already exist. This script will NOT add one. Only those hosts listed (with prefixes ’+’ and ’=’) are able to update their entries.

For example:

+groucho.example.com:192.168.0.2:3360
+groucho.example.com:192.168.0.2
=groucho.example.com:192.168.0.2:60
+*.groucho.example.com:192.168.0.2:60
+*.groucho.example.com:192.168.0.2

will all get updated if the host groucho.example.com does a request.

Client

To install the client code:

1. Copy the ‘tinydnsdyn-client’ script into your DNS client’s path (i.e. /usr/local/bin/)

2. Arrange to periodically run the ‘tinydnsdyn-client’ program (via cron et al) like so:

   tinydnsdyn-client --hostname=<myhostname> --server=<mydnsserver> <passfile>

Only the passfile option is required.

1. The password must obviously be the same and the requested host name must exist in the ‘data’ file.

The Python code is basic and inefficient but it should work. I take no responsibility for anything that may happen to any of your machines. That said, please let me know if there are any issues by creating a ticket on the tinydnsdyn tracker.