#-
# Copyright 2017-2025 Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#!/usr/bin/bash

SCRIPT_DIR=$(dirname $(realpath $0))
CONFIG_FILE=$SCRIPT_DIR/config

# Configurations
CONF_DIR=YOUR_CONFIG_DIR
CONF_FILE=YOUR_CONFIG_FILE
TYPE=THE_DEFAULT_VPN
# Gateway of the VPN:
vpngw=VPN_IP
devtun=tun0

set_terminal_title()
{
	echo -ne "\033]0;$1 VPN\007"
}

del_route()
{
	echo "ip route del $1 via $vpngw dev $devtun"
	ip route del $1 via $vpngw dev $devtun
}

add_route()
{
	echo "ip route add $1 via $vpngw dev $devtun"
	ip route add $1 via $vpngw dev $devtun
}

set_routes()
{
	local c=0
	local sec=10
	while [ -z `ip addr | grep -E '^[0-9]' | awk '{print $2}' | sed 's/:$//' | grep $devtun` ]; do
		echo Waiting for $devtun
		sleep 1
		c=`expr $c + 1`
		if [ $c -gt $sec ]; then
			echo $devtun not created. Exiting.
			exit 1
		fi
	done

	echo "$devtun ready."
}

add_config()
{
	local config_file=
	local config_name=

	while [ -z "$config_file" ]; do
		echo -n "Set OpenVPN config file: "
		read config_file
	done

	while [ -z "$config_name" ]; do
		echo -n "Set a name for the config file: "
		read config_name
	done
	config_file=$(eval realpath "$config_file")

	echo "CONF_${config_name^^}=$config_file" > "$CONFIG_FILE"
}

check_config()
{
	[ -f "$CONFIG_FILE" ] && return
	add_config
}

check_config

ISROOT=`id -u`

if [ $ISROOT != 0 ]; then
    echo 'You must be root to run vpn'
    exit 1
fi

if [ ! -z $1 ]; then
    TYPE=$1
fi

# Change title of current terminal
set_terminal_title $TYPE

set_routes &
openvpn $CONF_DIR/$TYPE/$CONF_FILE