auto-connect.sh is a script file which you can use to monitor your OpenVPN connection for disconnects, update both UFW and your OpenVPN file and reconnect for you. This is really handy for VPN providers that rotate IP addresses frequently and you wish to restrict traffic when your server isn't connected to the VPN of your choosing. Works with private internet access, NordVPN, ProtonVPN etc.
dig - For updating the IP address list
UFW - For your killswitch
OpenVPN - To connect to your VPN
This script uses two template files, openvpn.ovpn.template and user.rules.template. In both files, place [content] where the domain or IP addresses would normally be. In the OpenVPN connection file this is the line beginning remote and for the UFW user.rules file, next to any other IP configuration. Templates are provided as examples.
The script currently expects your user.rules file to live in /etc/ufw/user.rules, you may need to adjust this.
Usage is pretty simple, just call with a domain to refresh IP addresses from and your device name to monitor (normally ton0).
./auto-connect.sh "my.vpn.domain" "tun0"
Works well with cron
*/1 * * * * cd /home/account/openvpn && ./ac.sh "my.vpn.domain" "tun0" > out.out
I'm no UNIX expert; this script may contains bugs and no doubt can be improved. If you have any suggestions, i'm very open to merge requests ❤