#!/bin/bash
# The purpose of this script is to check if VPN connection is active
# This script will be called (via a service) in 2 situations:
  # On a regular basis when transmission is running
    # This will be achieved with a timer started and stopped with transmission service
  # On transmission starting
# When the script exits with failure, associated service should try to start transmission service
  # NOTE not on transmission starting, as this script is not run by its service; it means there's an issue with VPN at
  # start, and this should be looked at manually
# Thus this script will be executed again
  # We can enter an infinite loop, but this will effectively prevent transmission from connecting
# If both services are stopped, this script will never be run by error

run_directory=$(dirname $(readlink -f "$0"))
source "$run_directory/variables.conf"

# Parameters
myip_request="curl -s -4 https://ifconfig.co"
vpn_service="openvpn-client@vpn.service"
transmission_service="transmission-daemon.service"

# Main process
ip=$($myip_request)
if [[ $ip = $real_ip ]]; then
  systemctl stop $transmission_service
  systemctl stop $vpn_service
  sleep 3
  systemctl start $vpn_service
  sleep 5
  exit 1
elif [[ $ip =~ (25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3} ]]; then
  exit 0
else
  exit 1
fi