Spawns OpenVPN connection and monitors external IP for changes. If a change is detected, qbittorrent-nox service is shut down and the SysAdmin is notified. This script has been updated to run daemonized, and on an IP change all of the relevant services are restarted. Put all of these files into the directory '/script'

-Dependencies-

1. qBitTorrent-nox installed and configured as a service named qbittorrent-nox (the default name).
2. OpenVPN installed.
3. ssmtp installed and configured to send email from command line. You can use an internal mail server if one is configured on this serever, or you can connect to an SMTP server of your choice. (This is optional and easily removed if you don't want to receive email notifications.)
4. You've put all of these files into '/script'. You'll probably need to create this directory.
5. You have valid credentials to connect to an OpenVPN server. This script is hard coded to use the 'config.ovpn' file for its configuration. You'll need to supply your own .ovpn file from your provider here, and your own user name and password in the 'pass.txt' file.

-killswitch.sh-

This is the script that actually does all of the work. Uncomment line 52 and fill in your email address.

-error.txt-

This is the subject and body of the email that is automatically sent by the server should the killswitch engage.

-pass.txt-

This is where your OpenVPN user name and password are stored in plain text. These are usually NOT your user name and password for your VPN service, if you pay for one!! The OpenVPN credentials are a string of letters and numbers, both for the user name and the password.

To daemonize: Create the file vpn.service at /etc/systemd/system with the following 7 lines:

[Unit] After=network.service [Service] WorkingDirectory=/script ExecStart=/script/killswitch.sh [Install] WantedBy=multi-user.target

I also chose to modify the qbittorrent-nox.service file to require that the vpn is running in order for it to also run. To do this, edit /etc/systemd/system/qbittorrent-nox.service and add the following line to the 'Unit' section:

Requires=vpn.service