I set up a simple python server that listens on a specific (highly unlikely to be guessed) url and when visited runs a shell script to add the visiting ip to ip

I set up a simple python server that listens on a specific (highly unlikely to be guessed) url and when visited runs a shell script to add the visiting ip to iptables dns whitelist. So I can visit a relatives house, go to that page then add my dns ip to their router (if they want me to). Also helps for when traveling or when isp renews dhcp lease.