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/**
* Copyright (c) 2013 LEAP Encryption Access Project and contributers
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.leap.bitmaskclient.eip;
import static se.leap.bitmaskclient.base.models.Constants.EIP_ACTION_START_ALWAYS_ON_VPN;
import static se.leap.bitmaskclient.base.models.Constants.EIP_ACTION_START_BLOCKING_VPN;
import static se.leap.bitmaskclient.base.models.Constants.EIP_ACTION_STOP_BLOCKING_VPN;
import static se.leap.bitmaskclient.base.utils.ConfigHelper.getProviderFormattedString;
import android.app.Notification;
import android.content.Intent;
import android.net.VpnService;
import android.os.Binder;
import android.os.Build;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.ParcelFileDescriptor;
import android.system.OsConstants;
import android.util.Log;
import java.io.IOException;
import java.util.Observable;
import java.util.Observer;
import de.blinkt.openvpn.core.ConnectionStatus;
import de.blinkt.openvpn.core.VpnStatus;
import se.leap.bitmaskclient.R;
import se.leap.bitmaskclient.base.utils.PreferenceHelper;
public class VoidVpnService extends VpnService implements Observer, VpnNotificationManager.VpnServiceCallback {
static final String TAG = VoidVpnService.class.getSimpleName();
private ParcelFileDescriptor fd;
private final int ALWAYS_ON_MIN_API_LEVEL = Build.VERSION_CODES.N;
private static final String STATE_ESTABLISH = "ESTABLISHVOIDVPN";
public static final String NOTIFICATION_CHANNEL_NEWSTATUS_ID = "bitmask_void_vpn_news";
private EipStatus eipStatus;
private VpnNotificationManager notificationManager;
private HandlerThread handlerThread;
private Handler handler;
private final IBinder binder = new VoidVpnServiceBinder();
public class VoidVpnServiceBinder extends Binder {
VoidVpnService getService() {
// Return this instance of LocalService so clients can call public methods
return VoidVpnService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return binder;
}
@Override
public void onCreate() {
super.onCreate();
eipStatus = EipStatus.getInstance();
eipStatus.addObserver(this);
notificationManager = new VpnNotificationManager(this);
handlerThread = new HandlerThread("VoidVpnServiceHandlerThread", Thread.NORM_PRIORITY);
handlerThread.start();
handler = new Handler(handlerThread.getLooper());
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String action = intent != null ? intent.getAction() : "";
handler.removeCallbacksAndMessages(null);
if (EIP_ACTION_START_BLOCKING_VPN.equals(action)) {
handler.post(() -> {
establishBlockingVpn();
PreferenceHelper.isAlwaysOnSync(false);
Log.d(TAG, "start blocking vpn profile - always on = false");
});
} else if (intent == null || "android.net.VpnService".equals(action) && Build.VERSION.SDK_INT >= ALWAYS_ON_MIN_API_LEVEL) {
//only always-on feature triggers this
startWithForegroundNotification();
handler.post(() -> {
establishBlockingVpn();
PreferenceHelper.isAlwaysOnSync(true);
requestVpnWithLastSelectedProfile();
Log.d(TAG, "start blocking vpn profile - always on = true");
});
} else if (EIP_ACTION_STOP_BLOCKING_VPN.equals(action)) {
stop();
}
return START_STICKY;
}
@Override
public void onRevoke() {
super.onRevoke();
stop();
}
@Override
public void onDestroy() {
Log.d(TAG, "onDestroy");
super.onDestroy();
notificationManager.cancelAll();
eipStatus.deleteObserver(this);
}
private void stop() {
handlerThread.interrupt();
closeFd();
VpnStatus.updateStateString("NOPROCESS", "BLOCKING VPN STOPPED", R.string.state_noprocess, ConnectionStatus.LEVEL_NOTCONNECTED);
stopForeground(true);
stopSelf();
}
private void closeFd() {
try {
if (fd != null) {
fd.close();
fd = null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
private Builder prepareBlockingVpnProfile() {
Builder builder = new Builder();
builder.setSession("Blocking until running");
builder.addRoute("0.0.0.0", 0);
builder.addRoute("192.168.1.0", 24);
builder.addDnsServer("10.42.0.1");
builder.addAddress("10.42.0.8", 16);
builder.addRoute("::",0);
builder.addAddress("fc00::", 7);
allowAllAFFamilies(builder);
return builder;
}
private void allowAllAFFamilies(Builder builder) {
builder.allowFamily(OsConstants.AF_INET);
builder.allowFamily(OsConstants.AF_INET6);
}
private void establishBlockingVpn() {
try {
VpnStatus.logInfo(getProviderFormattedString(getResources(), R.string.void_vpn_establish));
VpnStatus.updateStateString(STATE_ESTABLISH, "",
R.string.void_vpn_establish, ConnectionStatus.LEVEL_BLOCKING);
Builder builder = prepareBlockingVpnProfile();
builder.addDisallowedApplication(getPackageName());
fd = builder.establish();
} catch (Exception e) {
// Catch any exception
e.printStackTrace();
VpnStatus.logError(R.string.void_vpn_error_establish);
}
}
private void requestVpnWithLastSelectedProfile() {
Intent startEIP = new Intent(getApplicationContext(), EIP.class);
startEIP.setAction(EIP_ACTION_START_ALWAYS_ON_VPN);
getApplicationContext().startService(startEIP);
}
@Override
public void update(Observable observable, Object arg) {
if (observable instanceof EipStatus) {
eipStatus = (EipStatus) observable;
}
if (handlerThread.isInterrupted() || !handlerThread.isAlive()) {
return;
}
if (eipStatus.isBlockingVpnEstablished()) {
String blockingMessage = getProviderFormattedString(getResources(), eipStatus.getLocalizedResId());
notificationManager.buildVoidVpnNotification(
blockingMessage,
blockingMessage,
eipStatus.getLevel(),
null
);
} else {
stopForeground(true);
}
}
@Override
public void onNotificationBuild(int notificationId, Notification notification) {
startForeground(notificationId, notification);
}
public void startWithForegroundNotification() {
notificationManager.createVoidVpnNotificationChannel();
String message = getString(R.string.state_disconnected);
notificationManager.buildVoidVpnNotification(
message,
message,
eipStatus.getLevel(),
this
);
}
}
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