VPN Manager Script

vpn.sh

#!/bin/bash

PS3="Select item: "


function vpnActive() {
	ip -f inet addr show tun0 > /dev/null 2>&1
	if [ $? -eq 0 ] ; then return 0 ; else return 1 ; fi
}


function d2b() {
    printf "%08d" $(echo "obase=2;$1"|bc)
}


function getPortForwarding {
	if vpnActive
	then
		IPv4_ADDR=$(ip -f inet addr show tun0 | awk '/inet / {print $2}' | cut -d'/' -f1)
		IFS='.' read -ra ADDR <<< "$IPv4_ADDR"
		port_bin="$(d2b ${ADDR[2]})$(d2b ${ADDR[3]})"
		port_dec=$(printf "%04d" $(echo "ibase=2;${port_bin:4}"|bc))
		echo ""
		echo "Usable Ports for PortFowarding:"
		for i in 1 2 3; do
    			echo "$i$port_dec"
		done
	else
		echo ""
		echo "VPN not active!"
	fi
}


function connect { 
	echo ""
	if [[ ${1:0:3} != "HTB" ]]
	then 
		echo "Enabling kill switch"
		sudo ufw enable
	fi
	echo $1 > /tmp/vpn.tmp
	echo "Starting VPN $1"
	sudo systemctl start openvpn-client@$1
	exit 0
}


function disconnect {
	echo ""
	if test -f "/tmp/vpn.tmp"; then
		VPN=$(cat /tmp/vpn.tmp)
		echo "Disconnect from VPN $VPN"
		sudo systemctl stop openvpn-client@$VPN
		rm -f /tmp/vpn.tmp
		if [[ ${VPN:0:3} != "HTB" ]]
		then 
			echo "Disable kill switch"
			sudo ufw disable
		fi
		exit 0
	else
		echo "No active VPN found!"
		exit 1
	fi
} 


function menuHTB {
	items=(
	"HTB_Academy"         
	"HTB_Server"             
	"HTB_StartingPoint"          
	)

	select item in "${items[@]}"
	do
		case $REPLY in
			q) exit 0;;
			*) 
			if [ -z "$item" ]; then echo "Invalid choice!"; menuHTB; else connect $item; fi
			exit 0;;
		esac
	done
}


function menuPerfectPrivacy {
	items=(
	"Amsterdam"         
	"Basel"             
	"Belgrade"          
	"Berlin"            
	"Calais"            
	"Chicago"         
	"Copenhagen"      
	"Dallas"          
	"Erfurt"    
	"Frankfurt" 
	"Hamburg"   
	"Hongkong"  
	"Jerusalem" 
	"London"    
	"LosAngeles"
	"Madrid"    
	"Malmoe"    
	"Manchester"
	"Miami"     
	"Milan"     
	"Montreal"  
	"Moscow"    
	"NewYork"   
	"Nuremberg" 
	"Oslo"     
	"Paris"    
	"Prague"   
	"Reykjavik"
	"Riga"     
	"Rotterdam"
	"Singapore"
	"Stockholm"
	"Sydney"
	"Tokyo"
	"Vienna"
	"Warsaw"
	"Zurich"
	)

	select item in "${items[@]}"
	do
		case $REPLY in
			q) exit 0;;
			*) 
			if [ -z "$item" ]; then echo "Invalid choice!"; menuPerfectPrivacy; else connect $item; fi
			exit 0;;
		esac
	done
}


echo "VPN Manager:"
select item in "HackTheBox" "Perfect Privacy" "PortForwarding" "Disconnect" "Quit"
do
	case $REPLY in
		1) menuHTB; break;;
		2) menuPerfectPrivacy; break;;
		3) getPortForwarding; break;;
		4|x|d) disconnect; break;;
		5|q) exit 0; break;;
	esac
done