2015-10-24 18:01:55 +00:00
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package eu.faircode.netguard;
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import android.app.PendingIntent;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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2015-10-25 09:29:49 +00:00
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import android.content.SharedPreferences;
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2015-10-24 18:01:55 +00:00
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import android.net.ConnectivityManager;
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import android.net.NetworkInfo;
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import android.net.VpnService;
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import android.os.ParcelFileDescriptor;
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2015-10-24 19:50:29 +00:00
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import android.preference.PreferenceManager;
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2015-10-24 18:01:55 +00:00
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import android.util.Log;
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import java.io.FileInputStream;
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import java.io.IOException;
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public class BlackHoleService extends VpnService implements Runnable {
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private static final String TAG = "NetGuard.BlackHole";
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2015-10-25 09:29:49 +00:00
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private Thread thread = null;
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public static final String EXTRA_COMMAND = "Command";
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2015-10-24 18:01:55 +00:00
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2015-10-25 09:29:49 +00:00
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public enum Command {start, reload, stop}
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2015-10-24 18:01:55 +00:00
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@Override
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public int onStartCommand(Intent intent, int flags, int startId) {
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2015-10-25 09:29:49 +00:00
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
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boolean enabled = prefs.getBoolean("enabled", false);
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Command cmd = (intent == null ? Command.start : (Command) intent.getSerializableExtra(EXTRA_COMMAND));
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Log.i(TAG, "Start intent=" + intent + " command=" + cmd + " enabled=" + enabled + " running=" + (thread != null));
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if (cmd == Command.reload || cmd == Command.stop) {
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if (thread != null) {
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2015-10-25 10:55:49 +00:00
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Log.i(TAG, "Stopping thread=" + thread);
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2015-10-25 09:29:49 +00:00
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thread.interrupt();
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}
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if (cmd == Command.stop)
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stopSelf();
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}
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2015-10-24 18:01:55 +00:00
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2015-10-25 09:29:49 +00:00
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if (cmd == Command.start || cmd == Command.reload) {
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if (enabled && (thread == null || thread.isInterrupted())) {
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Log.i(TAG, "Starting");
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thread = new Thread(this, "BlackHoleThread");
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thread.start();
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2015-10-25 10:55:49 +00:00
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Log.i(TAG, "Started thread=" + thread);
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2015-10-25 09:29:49 +00:00
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}
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2015-10-24 18:01:55 +00:00
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}
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return START_STICKY;
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}
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private BroadcastReceiver connectivityChangedReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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2015-10-25 09:29:49 +00:00
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Log.i(TAG, "Received " + intent);
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Util.logExtras(TAG, intent);
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if (intent.hasExtra(ConnectivityManager.EXTRA_NETWORK_TYPE) &&
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intent.getIntExtra(ConnectivityManager.EXTRA_NETWORK_TYPE, ConnectivityManager.TYPE_DUMMY) == ConnectivityManager.TYPE_WIFI) {
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Intent service = new Intent(BlackHoleService.this, BlackHoleService.class);
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service.putExtra(BlackHoleService.EXTRA_COMMAND, Command.reload);
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startService(service);
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}
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2015-10-24 18:01:55 +00:00
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}
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};
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@Override
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public void onCreate() {
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super.onCreate();
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2015-10-24 19:50:29 +00:00
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Log.i(TAG, "Create");
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2015-10-24 18:01:55 +00:00
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IntentFilter intentFilter = new IntentFilter();
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intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
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registerReceiver(connectivityChangedReceiver, intentFilter);
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}
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@Override
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public void onDestroy() {
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Log.i(TAG, "Destroy");
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2015-10-25 10:55:49 +00:00
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if (thread != null) {
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Log.i(TAG, "Interrupt thread=" + thread);
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2015-10-24 18:01:55 +00:00
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thread.interrupt();
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2015-10-25 10:55:49 +00:00
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}
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2015-10-24 18:01:55 +00:00
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unregisterReceiver(connectivityChangedReceiver);
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super.onDestroy();
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}
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@Override
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public void onRevoke() {
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Log.i(TAG, "Revoke");
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2015-10-25 10:55:49 +00:00
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if (thread != null) {
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Log.i(TAG, "Interrupt thread=" + thread);
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2015-10-24 18:01:55 +00:00
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thread.interrupt();
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2015-10-25 10:55:49 +00:00
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}
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2015-10-25 09:29:49 +00:00
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SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
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prefs.edit().putBoolean("enabled", false).apply();
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2015-10-24 18:01:55 +00:00
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super.onRevoke();
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}
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@Override
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2015-10-25 09:29:49 +00:00
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public synchronized void run() {
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2015-10-25 10:55:49 +00:00
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Log.i(TAG, "Run thread=" + Thread.currentThread());
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2015-10-24 18:01:55 +00:00
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ParcelFileDescriptor pfd = null;
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try {
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2015-10-24 19:50:29 +00:00
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// Check if Wi-Fi connection
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2015-10-24 18:01:55 +00:00
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ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
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NetworkInfo ni = cm.getActiveNetworkInfo();
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boolean wifi = (ni != null && ni.getType() == ConnectivityManager.TYPE_WIFI);
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Log.i(TAG, "wifi=" + wifi);
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2015-10-24 19:50:29 +00:00
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// Build VPN service
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2015-10-24 18:01:55 +00:00
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final Builder builder = new Builder();
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builder.setSession("BlackHoleService");
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builder.addAddress("10.1.10.1", 32);
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builder.addRoute("0.0.0.0", 0);
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2015-10-25 11:52:54 +00:00
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builder.setBlocking(false);
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2015-10-24 18:01:55 +00:00
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// Add list of allowed applications
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for (Rule rule : Rule.getRules(this))
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if (!(wifi ? rule.wifi_blocked : rule.other_blocked)) {
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Log.i(TAG, "Allowing " + rule.info.packageName);
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builder.addDisallowedApplication(rule.info.packageName);
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}
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Intent intent = new Intent(this, ActivityMain.class);
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PendingIntent pi = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
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builder.setConfigureIntent(pi);
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2015-10-24 19:50:29 +00:00
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// Start VPN service
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2015-10-24 18:01:55 +00:00
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pfd = builder.establish();
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2015-10-24 19:50:29 +00:00
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// Drop all packets
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2015-10-25 10:55:49 +00:00
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Log.i(TAG, "Loop start thread=" + Thread.currentThread());
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2015-10-24 19:50:29 +00:00
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FileInputStream in = new FileInputStream(pfd.getFileDescriptor());
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2015-10-25 10:55:49 +00:00
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while (!Thread.currentThread().isInterrupted() && pfd.getFileDescriptor().valid())
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2015-10-25 11:52:54 +00:00
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if (in.skip(32768) < 0)
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try {
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Thread.sleep(1000);
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} catch (InterruptedException ignored) {
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}
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2015-10-25 10:55:49 +00:00
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Log.i(TAG, "Loop exit thread=" + Thread.currentThread());
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2015-10-25 09:29:49 +00:00
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2015-10-24 18:01:55 +00:00
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} catch (Throwable ex) {
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Log.e(TAG, ex.toString() + "\n" + Log.getStackTraceString(ex));
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2015-10-25 09:29:49 +00:00
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2015-10-24 18:01:55 +00:00
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} finally {
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if (pfd != null)
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try {
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pfd.close();
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} catch (IOException ex) {
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Log.e(TAG, ex.toString() + "\n" + Log.getStackTraceString(ex));
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}
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}
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}
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}
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