ua-vpn

#!/bin/bash

# Exit on error
set -e

function _ {
[ -x "$(command -v $1)" ] || {
        echo "Error: '$1' is not installed." >&2
        exit 1
    }
}

# You must have these binaries in your system.
_ docker
_ curl
_ systemd-resolve # likely to be installed
# ---------------

IMAGE_NAME="ua-snx-vpn"

function update {

echo ""
echo "Copying ua-vpn script to /usr/local/bin [with sudo].."
curl -Lks https://raw.githubusercontent.com/eupedrosa/ua-snx-vpn/master/ua-vpn > /tmp/ua-vpn
chmod +x /tmp/ua-vpn
sudo mv /tmp/ua-vpn /usr/local/bin

} # end install

function status {
container=$(docker ps -f 'name=ua-vpn' -f 'status=running' -q)
test -z "$container" && {
    echo "Disconnected"
    return
}

echo "VPN Container is running.."
test ! -d /sys/class/net/tunsnx && {
    echo "The VPN tunnel does not exist, something is wrong.."
    exit 1
}

rx_bytes=`cat /sys/class/net/tunsnx/statistics/rx_bytes`
rx_dropped=`cat /sys/class/net/tunsnx/statistics/rx_dropped`

tx_bytes=`cat /sys/class/net/tunsnx/statistics/tx_bytes`
tx_dropped=`cat /sys/class/net/tunsnx/statistics/tx_dropped`

echo -e "TX Bytes: $tx_bytes \tDropped: $tx_dropped"
echo -e "RX Bytes: $rx_bytes \tDropped: $rx_dropped"

}


function up {

container=$(docker ps -f 'name=ua-vpn' -f 'status=running' -q)
test ! -z "$container" && {
    echo "VPN container already running.."
    return
}

read -p 'UA username: ' VPN_USER
read -sp 'Password: '   VPN_PWD
echo ""

docker run --rm --name ua-vpn --network host --cap-add=ALL -v /lib/modules:/lib/modules \
    -e VPN_USER=$VPN_USER -e VPN_PWD=$VPN_PWD -td $IMAGE_NAME > /dev/null

# Give it time to create the connection
sleep 2

# Make sure it is running
container=$(docker ps -f 'name=ua-vpn' -f 'status=running' -q)
test -z "$container" && {
    echo "VPN connection failed.."
    return
}

echo "VPN connected.."
echo "Setting DNS server [with sudo].."

# DNS servers 193.136.172.{20,21}
# DNS suffix ua.pt
sudo systemd-resolve -i tunsnx --set-dns=193.136.172.20 --set-dns=193.136.172.21 --set-domain=ua.pt

echo "Done"

} # end up

function down {

container=$(docker ps -f 'name=ua-vpn' -f 'status=running' -q)
test -z "$container" && {
    echo "VPN container is not running.."
    return
}

echo "Terminating VPN connection.."
docker exec ua-vpn snx -d > /dev/null
docker stop -t 1 ua-vpn > /dev/null
echo "Done"

} # end down

function usage {

echo "usage: `basename $0` [command]"
echo ""
echo "Commands"
echo "  up        Create the VPN connection."
echo "  down      Terminate ther VPN connection."
echo "  update    Update the UA's VPN docker image and this script."
echo "  status    Show connection status."

} # end status

[ $# -eq 0 ] && { usage; exit; }

case $1 in
    up) up ;;
    down) down ;;
    update) update ;;
    status) status ;;
    *) usage ;;
esac