Detect behind VPN in android

Question

How to detect programatically if traffic is going through VPN without using intent to connect to VPNService. Is there some system call?

Answer 1

You can detect VPN with following code in android. Code will work in new and older version of android. Below code is in Kotlin.

    class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if(checkVPNStatus()) {
            Log.d("VPN-RAJ", "is VPN Connected YES")
        } else {
            Log.d("VPN-RAJ", "is VPN Connected NO")
        }
    }


    private fun checkVPNStatus(): Boolean {
        val connectivityManager = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager

        return if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            val network = connectivityManager.activeNetwork
            val capabilities = connectivityManager.getNetworkCapabilities(network)
            Log.d("VPN-RAJ", "in New Android Version")

            capabilities!= null && capabilities.hasTransport(NetworkCapabilities.TRANSPORT_VPN)

        } else {
            Log.d("VPN-RAJ", "in Old Android Version")

            connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_VPN)!!.isConnectedOrConnecting
        }


    }


}