Check whether device is connected to a VPN

Question

I am able to check whether a device is connected to the internet using:

var connected: Bool = true
var zeroAddress = sockaddr_in()
zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
zeroAddress.sin_family = sa_family_t(AF_INET)
let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
    SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
}
var flags = SCNetworkReachabilityFlags()
if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
    connected = false
}
let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
let needsConnection = (flags.rawValue & UInt2(kSCNetworkFlagsConnectionRequired)) != 0

if isReachable && !needsConnection && connected {
    login(usernameTextField.text!, password: appPassword.text!, environment: environmentUrl)
} else {
    let alert = UIAlertView()
    alert.title = "No internet connection detected."
    alert.addButtonWithTitle("OK")
    alert.show()

    return
}

But is there any way of checking whether the device is connected to a VPN? The app that I am writing requires a VPN for access, so rather than allowing a user to attempt a login when not connected to a VPN, I would like to prompt them prior (better user experience in my opinion).

Thank you for your help.

Answer 1

I made it work for Swift 3/4 by using the following code:

private var isConnectedToVpn: Bool {
    if let settings = CFNetworkCopySystemProxySettings()?.takeRetainedValue() as? Dictionary<String, Any>,
        let scopes = settings["__SCOPED__"] as? [String:Any] {
        for (key, _) in scopes {
         if key.contains("tap") || key.contains("tun") || key.contains("ppp") || key.contains("ipsec") {
                return true
            }
        }
    }
    return false
}