An alternative to DDNS

 

	# An alternative to DDNS
	#
	# What if you want to access your local home server from the internet but have a dynamic ip address?
	# Typically you use dynamic domain name resolution (ddns) for this. There are serveral providers out
	# there offering you a ddns subdomain. However, you have to create an account, spent money or accept
	# limitations of the provider.
	#
	# So, here an alternative:
	# – Create a Google Formular containing one input field: your ip address.
	# – From your local server, determine your current external ip address (e.g. by retrieving it from
	# a website).
	# – Whenever your ip changes, paste it to your google formular.
	# – Now, you only have to store/know a permanent link to your google sheet to read the current ip of
	# your home server.
	# – The python script below implements the idea. Feel free to run it on your home server.
	#
	# – Dependencies: Python, curl, google account
	# – Usage: Make sure to edit the variables formular_url and field_name according to your formular.
	#!/usr/bin/env python
	import subprocess
	import time
	if __name__ == '__main__':
	# The url to the formular
	formular_url = 'https://docs.google.com/forms/d/1POTEbzxEou_ZKpMM6M*************K5fNrkFX4/formResponse'
	# Inspect the source code of your Google Formular website to get the name of your field
	field_name = 'entry.1461371975'#my example
	old_ip = ''
	while True:
	try:
	current_ip = subprocess.check_output(['curl', 'ipecho.net/plain'])
	if old_ip != current_ip:
	subprocess.call(['curl', '–data', field_name + '=' + current_ip, formular_url])
	old_ip = current_ip
	except Exception as e:
	pass
	time.sleep(10*60)

view raw

ip_notify.py

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