use pnet::datalink::interfaces;

fn main() {
    let all_interfaces = interfaces();

    // Search for the OpenVPN interface - the one that is
    // up, not loopback, has an IP and point to point.
    let openvpn = all_interfaces
        .iter()
        .filter(|e| e.is_up() && !e.is_loopback() && e.ips.len() > 0 && e.is_point_to_point())
        .next();

    match openvpn {
        Some(_) => println!("VPN"),
        _ => println!(""),
    }
}