This script provides a simple API to control VPN connections in macOS.

vpn.sh

#!/bin/sh

# This script provides a simple API to control VPN connections in macOS.

DEFAULT_VPN="$(scutil --nc list | awk '/IPSec/ {print $5}' | sed 's/\"//g')"
COMMAND=$1
VPN_NAME=${2:-${DEFAULT_VPN}}

function turn_on_vpn() {
    echo $(scutil --nc start ${VPN_NAME})
    vpn_status=''
    get_vpn_status vpn_status
    echo "VPN Status: ${vpn_status}"

    if [ "${vpn_status}" == "Connected" ]
    then
        exit 0;
    else
        exit 1;
    fi
}

function turn_off_vpn() {
    echo $(scutil --nc stop "${VPN_NAME}")
    vpn_status=''
    get_vpn_status vpn_status
    echo "VPN Status: ${vpn_status}"

    if [ "${vpn_status}" == "Disconnected" ]
    then
        exit 0;
    else
        exit 1;
    fi
}

function get_vpn_status() {
    vpn_status=$(scutil --nc status "${VPN_NAME}" | sed -n 1p)
    eval "$1=${vpn_status}"
}

function display_vpn_status() {
    vpn_status=''
    get_vpn_status vpn_status
    echo "${vpn_status}"
}

function list_vpn_services() {
    echo "$(scutil --nc list | awk '/IPSec/ {print $5}' | sed 's/\"//g')"
} 

case ${COMMAND} in

up)
    turn_on_vpn
    ;;

down)
    turn_off_vpn
    ;;

status)
    display_vpn_status
    ;;

list)
    list_vpn_services
    ;;

*)
    echo "usage: vpn <command> [VPN Name]"
    echo ""
    echo "These are the VPN commands available:"
    echo ""
    echo "  up       Bring up the VPN connection"
    echo "  down     Stop the VPN connection"
    echo "  status   Get the VPN connection status"
    echo "  list     List VPN services configured"
    echo ""
    echo "Available VPNs:"
    echo ""
    echo "$(list_vpn_services)"
    ;;
esac