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/**
* Copyright (c) 2020 LEAP Encryption Access Project and contributors
*
* 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.pluggableTransports;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import java.util.Observable;
import java.util.Observer;
import de.blinkt.openvpn.core.ConnectionStatus;
import de.blinkt.openvpn.core.VpnStatus;
import se.leap.bitmaskclient.eip.EipStatus;
public class ShapeshifterClient implements Observer {
public static final String DISPATCHER_PORT = "4430";
public static final String DISPATCHER_IP = "127.0.0.1";
private static final int MAX_RETRY = 5;
private static final int RETRY_TIME = 4000;
private static final String TAG = ShapeshifterClient.class.getSimpleName();
private final shapeshifter.Shapeshifter_ shapeShifter;
private boolean isErrorHandling;
private boolean noNetwork;
private int retry = 0;
private final Handler reconnectHandler;
@Deprecated
public class ShapeshifterLogger implements shapeshifter.Logger {
@Override
public void log(String s) {
Log.e(TAG, "SHAPESHIFTER ERROR: " + s);
VpnStatus.logError(s);
isErrorHandling = true;
close();
if (retry < MAX_RETRY && !noNetwork) {
retry++;
reconnectHandler.postDelayed(ShapeshifterClient.this::reconnect, RETRY_TIME);
} else {
VpnStatus.logError(VpnStatus.ErrorType.SHAPESHIFTER);
}
}
}
public ShapeshifterClient(Obfs4Options options) {
shapeShifter = new shapeshifter.Shapeshifter_();
shapeShifter.setLogger(new ShapeshifterLogger());
setup(options);
Looper.prepare();
reconnectHandler = new Handler();
EipStatus.getInstance().addObserver(this);
Log.d(TAG, "shapeshifter initialized with: \n" + shapeShifter.toString());
}
private void setup(Obfs4Options options) {
shapeShifter.setSocksAddr(DISPATCHER_IP+":"+DISPATCHER_PORT);
shapeShifter.setTarget(options.gatewayIP +":"+options.transport.getPorts()[0]);
shapeShifter.setCert(options.transport.getOptions().getCert());
}
public void setOptions(Obfs4Options options) {
setup(options);
}
public void start() {
try {
shapeShifter.open();
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG, "SHAPESHIFTER ERROR: " + e.getLocalizedMessage());
VpnStatus.logError(VpnStatus.ErrorType.SHAPESHIFTER);
VpnStatus.logError(e.getLocalizedMessage());
}
}
private void close() {
try {
shapeShifter.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private void reconnect() {
try {
shapeShifter.open();
retry = 0;
isErrorHandling = false;
} catch (Exception e) {
e.printStackTrace();
Log.e(TAG, "SHAPESHIFTER RECONNECTION ERROR: " + e.getLocalizedMessage());
VpnStatus.logError("Unable to reconnect shapeshifter: " + e.getLocalizedMessage());
}
}
public boolean stop() {
try {
shapeShifter.close();
return true;
} catch (Exception e) {
e.printStackTrace();
VpnStatus.logError(e.getLocalizedMessage());
}
EipStatus.getInstance().deleteObserver(this);
return false;
}
@Override
public void update(Observable observable, Object arg) {
if (observable instanceof EipStatus) {
EipStatus status = (EipStatus) observable;
if (status.getLevel() == ConnectionStatus.LEVEL_NONETWORK) {
noNetwork = true;
} else {
noNetwork = false;
if (isErrorHandling) {
isErrorHandling = false;
close();
start();
}
}
}
}
}
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