Wrapper script for managing connection to a VPN server using openconnect

vpn.sh

#!/bin/bash

# Connect to a VPN server using openconnect

prog_name=$(basename $0)
pid_file="/var/run/openconnect"
default_server="https://vpn.example.com/"

help () {
    echo "Usage: $prog_name [-c server] [-d]"
    echo
    echo "Options"
    echo "    -c, --connect <server> Connect to the specified VPN server"
    echo "    -d, --disconnect       Disconnect the active VPN connection"
    echo
}

connect () {
    if [ -n "$1" ]; then
        server=$1
    else
        server=$default_server
    fi

    if [ -f $pid_file ] && ps -p $(< $pid_file) >/dev/null 2>&1; then
        echo "Already connected to VPN server"
        exit 1
    fi

    sudo openconnect -b --pid-file=$pid_file $server
}

disconnect () {
    if [ -f $pid_file ]; then
        sudo pkill -SIGINT -F $pid_file
    else
        echo "Not connected to VPN server"
        exit 1
    fi
}

subcommand="$1"
case $subcommand in
    -h|--help|"")
    help
    ;;
    -c|--connect|connect)
    shift
    connect $@
    ;;
    -d|--disconnect|disconnect)
    disconnect
    ;;
    *)
    echo "Error: '$subcommand' is not a known command." >&2
    echo "       Run '$prog_name --help' for a list of known commands." >&2
    exit 1
    ;;
esac