bash_scripts/open_connection at master · ericsherlock/bash_scripts · GitHub

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# /bin/bash

#This Script Sets Up VPN and SSH connection back to home machines

#Usage Information
usage() {
	echo "Usage: [PROGRAM_NAME] [OPTION]"
	echo "Usage: OPTIONS: [ -h | --your_home ] [ -f | --other_host ]"
}

#Exit Function
exit_func () {

        if [ $1 == 1 ]; then
                echo "Exit 1 --> Incorrect Number Of Arguments."
                exit 1
        elif [ $1 == 2 ]; then
                echo "Exit 2 --> VPN Connection Could Not Be Established"
                exit 2
	elif [ $1 == 3 ]; then
		echo "Exit 3 --> Unable To Break Connection"
		exit 3
        elif [ $1 == 0 ]; then
                echo "Exit 0 --> Success!"
		exit 0
        fi
}

#Method To Open Connection
establish_connection () {

	#Open Terminal and OpenVPN Into
	gnome-terminal -e "openvpn --config /path/to/your/.ovpn/file"

	#Check If Connection Was Successful
	if [ !"$(check_connection)" ]; then
		echo "Connection Status --> Failure."
		usage
		exit_func 2
	elif [ "$(check_connection)" ]; then
		echo "Connection Status --> Success!"
		return 0
	fi
}

#Check Connection Pings A Host I Know To Be On Network To Check If I Am On VPN
check_connection () {

	for i in 1 2
	do
		ping -c3 "IP on Your Network"
		res=$?

		if [ $res == 0 ]; then
			return $res
		else
			continue
		fi
	done
}

#Kills All OpenVPN Connections
break_connection () {

	killall openvpn
	return 0
}

#If Number Of Arguments Is Correct
if [ $# -eq 1 ]; then
	while [ "$1" != "" ]; do
		#Check On The Arguments Passed In
		case $1 in
			#Based On Argument, Connect To VPN, Else Print Usage And Exit
			-h | --your_home )	if [ "$(establish_connection)" ]; then
							ssh user@your_home
							break_connection
							exit_func 0
						elif [ !"$(establish_connection)" ]; then
							usage
							exit_func 2
						fi
						;;

			-f | --other_user ) 	if [ "$(establish_connection)" ]; then
							ssh user@other_user
							break_connection
							exit_func 0
						elif [ !"$(establish_connection)" ]; then
							usage
							exit_func 2
						fi
						;;
			-ff | --other-files )	if [ "$(establish_connection)" ]; then
							sftp user@other_user
							break_connection
							exit_func 0
						elif [ !"$(establish_connection)" ]; then
							usage
							exit_func 2
						fi
						;;
			-hf | --home-files )	if [ "$(establish_connection)" ]; then
							sftp user@your_home
							break_connection
							exit_func 0
						elif [ "$(establish_connection)" ]; then
							usage
							exit_func 2
						fi
						;;
			* )			usage
						exit_func 2
		esac
	done

else

	usage
	exit_func 1
fi