Here is an example of an old implementation.

public class MyVpnService extends VpnService { private Thread mThread; private ParcelFileDescriptor mInterface; //a. Configure a builder for the interface. Builder builder = new Builder(); // Services interface @Override public int onStartCommand(Intent intent, int flags, int startId) { // Start a new session by creating a new thread. mThread = new Thread(new Runnable() { @Override public void run() { try { //a. Configure the TUN and get the interface. mInterface = builder.setSession("MyVPNService") .addAddress("192.168.0.1", 24) .addDnsServer("8.8.8.8") .addRoute("0.0.0.0", 0).establish(); //b. Packets to be sent are queued in this input stream. FileInputStream in = new FileInputStream( mInterface.getFileDescriptor()); //b. Packets received need to be written to this output stream. FileOutputStream out = new FileOutputStream( mInterface.getFileDescriptor()); //c. The UDP channel can be used to pass/get ip package to/from server DatagramChannel tunnel = DatagramChannel.open(); // Connect to the server, localhost is used for demonstration only. tunnel.connect(new InetSocketAddress("127.0.0.1", 8087)); //d. Protect this socket, so package send by it will not be feedback to the vpn service. protect(tunnel.socket()); //e. Use a loop to pass packets. while (true) { //get packet with in //put packet to tunnel //get packet form tunnel //return packet with out //sleep is a must Thread.sleep(100); } } catch (Exception e) { // Catch any exception e.printStackTrace(); } finally { try { if (mInterface != null) { mInterface.close(); mInterface = null; } } catch (Exception e) { } } } }, "MyVpnRunnable"); //start the service mThread.start(); return START_STICKY; } @Override public void onDestroy() { // TODO Auto-generated method stub if (mThread != null) { mThread.interrupt(); } super.onDestroy(); } }

Having carefully checked I found some errors and corrected them, a new question has now appeared in this part of the code.

  protect(tunnel.socket()); //e. Use a loop to pass packets. while (true) { //get packet with in //put packet to tunnel //get packet form tunnel //return packet with out //sleep is a must Thread.sleep(100); }

Please explain to me exactly what to write here to make a VPN connection work.

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