My new hosting provide Strato offers DynDNS. I was searching for a DynDNS client for my OpenSolaris Home Server, but a small bash script does the job as good as any other client.
#! /bin/bash . ${HOME}/.dyndns.cfg DOMAINS=$(cat ${HOME}/.dyndns.domains) echo "$(date '+%Y-%m-%d %H:%M') $(basename $0)" for domain in ${DOMAINS}; do echo -n " ${domain} - " curl --silent --show-error --insecure --user ${LOGIN} "${UPDATE_URL}?hostname=${domain}" done
First, the login credentials (the $LOGIN variable) and the server's URL ($UPDATE_URL) are read from the config file ~/.dyndns.cfg.
Here an example config file:
LOGIN="jdoe:secret" UPDATE_URL="http://members.dyndns.org/nic/update" # DynDNS service # UPDATE_URL="https://dyndns.strato.com/nic/update" # Strato's DynDNS service
The file .dyndns.domains contains all the domains which should be updated.
They must be whitespace separated, I recomment to put one domain per line.
In the for loop, curl is used to update the domains.
Currently, I use the switch –insecure to disable the SSL certificate check.
As soon a I found out how to download the server certificate and check it in the correct way I will let you know in an update.
This script is part of my scripts collection, so you can find the latest version at http://bitbucket.org/andunix/scripts/src/tip/bin/cron-dyndns-update.
You can find the DynDNS protocol specification at http://www.dyndns.com/developers/specs/syntax.html.