Simple utility to share the ip of a server with a dynamic address.
To setup, you need a server B with a known address, a server A you want to share the address and a client C.
On server B, upload the files in the directory server. Create a .htuser file with htpasswd -c .htuser username and enter some password. Edit the config.php file and add a secret random phrase.
On server A and client C, upload the files in the directory client. Enter the address of server B and the chosen username, password and secret phrase in the config.sh. On server A setup a cron job to run set_ip.sh in a regular interval. On the client C you can now query the current address of server B with get_ip.sh.