Dynamic IP update for vultr Firewall

This script was intended to be able to use vultr firewall and block all IPs and only whitelist your own IP.
because vultr don't accept a dynamic DDNS domain (like no-ip)

This script will update vultr with your new ip every time it changes

for example i have a freepbx server running in vultr so i set a firewall to only allow my location to access the server

Setup

Assuming you have a vultr account (if you dont have one you can use my affiliate link and Get $100 for the first 30 days)

• go to the firewall tab, and click 'Add Firewall Group'
• select the protocol you would like to open for yourself like TCP
• enter the port or range for example 1 - 65535
• select one source the ip (not important as the script will update it
• IMPORTANT, add a any word as a note to your rule, so the api can find it, for example i use my username mbrctv

Config

api_key vultr api key
firewallgroup the firewall ID
notes the note you added for reference
ddns_domain (Optional) the ddns domain if you have
smtp_server (Optional, defaults to gmail) user (Optional, defaults to from_email) username passed in smtp server authentication password (Optional) smtp server password
from_email (Optional) if you want email notification each time the IP changed
to_email (Optional) array of emails (can be array with only 1 email)
from_name (Optional) sender name

you can set api_key as global, or set it for each firewall rule you can set email or in global or for each firewall

Looping

To loop forever with a configurable delay between polls edit ddns.py and set loop_forever to True. The delay time is configurable, defaulting to 60 seconds.

Windows Task

Create a task in Task Scheduler to run every 30 minutes. Follow the Microsoft guide for basic task creation.

Open Task Scheduler and click "Create Task...". Give it a name and create a new trigger. Click "Daily". Under "Advanced Settings" click to repeat the task every 30 minutes and change "for a duration of" to "Indefinitely". Add a new action to start a program and browse to your Python executable. Add the ddns.py script as an argument.

Changelog

20/12/2021 - molexx

• update to vultr API v2
• configurable smtp server
• configurable smtp login/username
• optional loop forever
• more error handling, include info in the email
• don't require logging.yaml
• convert to unix format line endings
• add shebang to the top of the file to allow direct execution ./ddns.py
• support python 3.5 (for older raspberry pi installs)

molexx forked this from https://github.com/MBRCTV/VultrFirewallDynamicDNS

credit for https://github.com/andyjsmith/Vultr-Dynamic-DNS