Vpnservice Android pour capturer les paquets ne capturera pas les paquets

je cherche ma réponse depuis quelques heures maintenant et je n'arrive pas à la comprendre. S'il vous plaît aider.

ce que je veux faire est d'utiliser le service VpnService sous Android pour saisir des paquets réseau comme l'application tPacketCapture

j'ai commencé par utiliser le code échantillon ToyVpn de google et de le modifier afin de ne pas envoyer les données à un serveur. Cependant, je ne suis pas sûr que ce soit correct.

mon configure la méthode utilise l'adresse IP wlan pour le classeur.addAddress() avant d'appeler établir(). J'utilise un nexus 7 et j'ai utilisé "adb shell netcfg / grep wlan0" pour obtenir l'adresse:

wlan0 UP 192.168.0.6 / 24 0x00001043 10: bf: 48:bf: 5f :9d

et l'ajouter dans ma méthode:

    private void configure() throws Exception {
    // If the old interface has exactly the same parameters, use it!
    if (mInterface != null) {
        Log.i(TAG, "Using the previous interface");
        return;
    }

    // Configure a builder while parsing the parameters.
    Builder builder = new Builder();
    builder.setMtu(1500);
    builder.addAddress("192.168.0.6", 24);

    try {
        mInterface.close();
    } catch (Exception e) {
        // ignore
    }

    mInterface = builder.establish();
}

après avoir appelé ceci, j'appelle la méthode run que j'ai modifiée pour passer une chaîne au lieu d'une adresse Inetsocket et ceci est pas important parce que je ne l'utilise nulle part:

    private void run(String run) throws Exception {
    configure();

    FileInputStream in = new FileInputStream(mInterface.getFileDescriptor());

    // Allocate the buffer for a single packet.
    ByteBuffer packet = ByteBuffer.allocate(32767);

    // We use a timer to determine the status of the tunnel. It
    // works on both sides. A positive value means sending, and
    // any other means receiving. We start with receiving.
    int timer = 0;

    // We keep forwarding packets till something goes wrong.
    while (true) {
        // Assume that we did not make any progress in this iteration.
        boolean idle = true;

        // Read the outgoing packet from the input stream.
        int length = in.read(packet.array());
        if (length > 0) {

            Log.i(TAG,"************new packet");
            while (packet.hasRemaining()) {
                Log.i(TAG,""+packet.get());
                //System.out.print((char) packet.get());
            }

            // Write the outgoing packet to the tunnel.
            packet.limit(length);
            //  tunnel.write(packet);
            packet.clear();

            // There might be more outgoing packets.
            idle = false;

            // If we were receiving, switch to sending.
            if (timer < 1) {
                timer = 1;
            }
        }
    }
}

quand je fais ADB logcat, rien ne se passe. Suis-je le faire correctement? Je me sens comme je suis en manque de quelque chose.

Merci!

EDIT:

des logs je vois les lignes suivantes:

I/ActivityManager(  460): START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.android.toyvpn/.ToyVpnClient} from pid 10247
I/ActivityManager(  460): Start proc com.example.android.toyvpn for activity com.example.android.toyvpn/.ToyVpnClient: pid=10287 uid=10122 gids={50122, 3003, 1028}
I/ActivityManager(  460): Displayed com.example.android.toyvpn/.ToyVpnClient: +1s144ms
I/Vpn     (  460): Switched from [Legacy VPN] to com.example.android.toyvpn
D/Vpn     (  460): setting state=IDLE, reason=prepare
I/ToyVpnService(10287): running vpnService
D/Vpn     (  460): setting state=CONNECTING, reason=establish
D/VpnJni  (  460): Address added on tun0: 192.168.0.6/24
I/Vpn     (  460): Established by com.example.android.toyvpn.ToyVpnService on tun0
W/ContextImpl(  460): Calling a method in the system process without a qualified user: android.app.ContextImpl.bindService:1406 com.android.server.connectivity.Vpn.establish:289 com.android.server.ConnectivityService.establishVpn:3263 android.net.IConnectivityManager$Stub.onTransact:504 android.os.Binder.execTransact:351 
D/Vpn     (  460): setting state=AUTHENTICATING, reason=establish

on dirait qu'il se connecte.

source:

public class ToyVpnService extends VpnService implements Handler.Callback, Runnable {
    private static final String TAG = "ToyVpnService";

    private Handler mHandler;
    private Thread mThread;

    private ParcelFileDescriptor mInterface;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // The handler is only used to show messages.
        if (mHandler == null) {
            mHandler = new Handler(this);
        }

        // Stop the previous session by interrupting the thread.
        if (mThread != null) {
            mThread.interrupt();
        }

        // Start a new session by creating a new thread.
        mThread = new Thread(this, "ToyVpnThread");
        mThread.start();
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        if (mThread != null) {
            mThread.interrupt();
        }
    }

    @Override
    public boolean handleMessage(Message message) {
        if (message != null) {
            Toast.makeText(this, message.what, Toast.LENGTH_SHORT).show();
        }
        return true;
    }

    @Override
    public synchronized void run() {
        Log.i(TAG,"running vpnService");
        try {
            runVpnConnection();
        } catch (Exception e) {
            e.printStackTrace();
            //Log.e(TAG, "Got " + e.toString());
        } finally {
            try {
                mInterface.close();
            } catch (Exception e) {
                // ignore
            }
            mInterface = null;

            mHandler.sendEmptyMessage(R.string.disconnected);
            Log.i(TAG, "Exiting");
        }
    }

    private boolean runVpnConnection() throws Exception {

        configure();

        FileInputStream in = new FileInputStream(mInterface.getFileDescriptor());

        // Allocate the buffer for a single packet.
        ByteBuffer packet = ByteBuffer.allocate(32767);

        // We keep forwarding packets till something goes wrong.
        while (true) {
            // Assume that we did not make any progress in this iteration.
            boolean idle = true;

            // Read the outgoing packet from the input stream.
            int length = in.read(packet.array());
            if (length > 0) {

                Log.i(TAG,"************new packet");
                System.exit(-1);
                while (packet.hasRemaining()) {
                    Log.i(TAG,""+packet.get());
                    //System.out.print((char) packet.get());
                }
                packet.limit(length);
                //  tunnel.write(packet);
                packet.clear();

                // There might be more outgoing packets.
                idle = false;
            }
            Thread.sleep(50);
        }
    }

    public String getLocalIpAddress()
    {
        try {
            for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
                NetworkInterface intf = en.nextElement();
                for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
                    InetAddress inetAddress = enumIpAddr.nextElement();
                    Log.i(TAG,"****** INET ADDRESS ******");
                    Log.i(TAG,"address: "+inetAddress.getHostAddress());
                    Log.i(TAG,"hostname: "+inetAddress.getHostName());
                    Log.i(TAG,"address.toString(): "+inetAddress.getHostAddress().toString());
                    if (!inetAddress.isLoopbackAddress()) {
                        //IPAddresses.setText(inetAddress.getHostAddress().toString());
                        Log.i(TAG,"IS NOT LOOPBACK ADDRESS: "+inetAddress.getHostAddress().toString());
                        return inetAddress.getHostAddress().toString();
                    } else{
                        Log.i(TAG,"It is a loopback address");
                    }
                }
            }
        } catch (SocketException ex) {
            String LOG_TAG = null;
            Log.e(LOG_TAG, ex.toString());
        }

        return null;
    }

    private void configure() throws Exception {
        // If the old interface has exactly the same parameters, use it!
        if (mInterface != null) {
            Log.i(TAG, "Using the previous interface");
            return;
        }

        // Configure a builder while parsing the parameters.
        Builder builder = new Builder();
        builder.setMtu(1500);
        builder.addAddress("192.168.0.6", 24);
        try {
            mInterface.close();
        } catch (Exception e) {
            // ignore
        }

        mInterface = builder.establish();
    }
}