Start and maintain am openvpn connection

onlogin.sh

#!/bin/bash

# Test an IP address for validity:
# Usage:
#      valid_ip IP_ADDRESS
#      if [[ $? -eq 0 ]]; then echo good; else echo bad; fi
#   OR
#      if valid_ip IP_ADDRESS; then echo good; else echo bad; fi
#
function valid_ip()
{
	local  ip=$1
	local  stat=1

	if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
		OIFS=$IFS
		IFS='.'
		ip=($ip)
		IFS=$OIFS
		[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \
			&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]]
		stat=$?
		fi
		return $stat
}

# Set the origional IP address, without the proxy
nmcli con down "79cb5c38-f63e-4abe-9936-7cd1bcee4fb3" # Double check the proxy is offline
origip="$(curl -s http://ipv4.icanhazip.com/)"

# If run directly, execute some tests.
if valid_ip $origip; then
	echo "Valid IP"
else
	echo "Invalid IP"
	exit
fi

# Connect the the proxy without error on first run
nmcli con up "79cb5c38-f63e-4abe-9936-7cd1bcee4fb3"

while true
do
	if [ "$(curl -s http://ipv4.icanhazip.com/)" == "$origip"  ]; then
		echo "Error, IP has changed... reconnecting to the proxy"
		nmcli con down "79cb5c38-f63e-4abe-9936-7cd1bcee4fb3"
		sleep 1
		nmcli con up "79cb5c38-f63e-4abe-9936-7cd1bcee4fb3"
#	else
#		echo "Still behind a proxy"
	fi
		sleep 1800
done