Python implementation of a dynamic DNS Updater for afraid.org
Python libraries (Which should all come standard):
argparse
urllib2
ConfigParser
os
sys
re
xml.etree.cElementTree
The configuration file is split in to 3 sections:
[authentication]
api_key=insert_SHA1_key_here
[cache]
ip=0.0.0.0
[records]
host=base64_encoded_update_key
The default "example.cfg" is as follows:
[authentication]
api_key=
[cache]
ip=0.0.0.0
[records]
The api_key can be found by logging in to your afraid.org account and going to the the api page and clicking on either the "XML" or "ASCII" links.
Your url will then look like this:
http://freedns.afraid.org/api/?action=getdyndns&sha=API_KEY_HERE&style=xml
or
http://freedns.afraid.org/api/?action=getdyndns&sha=API_KEY_HERE
Copy your api key into the api_key= section of the config file.
This field is updated automatically by the script and stores the last known external IP Address that it found.
It starts off at 0.0.0.0, but will be updated the first time you run an update.
This field is also updated automatically by the script. When you run the script with the
--configure flag, you will interactively configure which records you want to update.
As long as you have the required python libraries, it should just work.
Once you have your configuration file properly configured, you may set this up on a cron and have it run at an interval of your choice, such as every 15 minutes:
*/15 * * * * python /path/to/dyndns.py /path/to/configuration/file
This implementation comes with a few options. At it's most basic usage, you will first want to configure your config file.
Follow the instructions above under the "api_key" section and put your afraid.org api_key in the config file.
Run dyndns.py in configuration mode:
python dyndns.py --configure example.cfg
Retreiving records from https://freedns.afraid.org/api/?action=getdyndns&sha=API_KEY_HERE&style=xml
Found 2 records
Delete all records (y/n): y
Save hosta.com to config file (y/n): y
Save hostb.com to config file (y/n): n
If your configuration file already has records saved to it, dyndns will ask if you want to delete all currently saved records. Usually you will want to do this if you have removed any records from the website, or just as a clean up.
The script will then run through each host and as you if you would like to save it to the configuration file or not.
This will leave you with a configuration file as follows:
[authentication]
api_key=API_KEY_HERE
[cache]
ip=0.0.0.0
[records]
hosta.com=base64_encoded_update_key
Once your configuration file is properly configured, just run it manually, or on a cron.
python dyndns.py example.cfg
This is strictly an informational option. This will fetch your current external ip and then display that, and your currently cached ip and exit. This will NOT update your configuration file.
python dyndns.py -c example.cfg
retreiving current external ip from http://checkip.dyndns.org
Current External IP Address: 1.2.3.4
Current Cached IP Address: 5.6.7.8
This is strictly an informational option. This will fetch your record information from afraid.org, display it to you, and exit.
python dyndns.py -r example.cfg
Retreiving records from https://freedns.afraid.org/api/?action=getdyndns&sha=API_KEY_HERE&style=xml
Record For: hosta.com
IP Address: 1.2.3.4
URL: https://freedns.afraid.org/dynamic/update.php?base64_encoded_update_key
Record For: hostb.com
IP Address: 2.3.4.5
URL: https://freedns.afraid.org/dynamic/update.php?base64_encoded_update_key
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