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/**
* Copyright (c) 2020 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.tethering;
import android.content.Context;
import android.content.IntentFilter;
import java.net.NetworkInterface;
import java.util.Enumeration;
import se.leap.bitmaskclient.utils.Cmd;
/**
* This manager tries to figure out the current tethering states for Wifi, USB and Bluetooth
* The default behavior differs for failing attempts to get these states:
* Wifi: keeps old state
* USB: defaults to false
* Bluetooth defaults to false
* For Wifi there's a second method to check the current state (see TetheringBroadcastReceiver).
* Either of both methods can change the state if they succeed, but are ignored if they fail.
* This should avoid any interference between both methods.
*/
public class TetheringStateManager {
private static final String TAG = TetheringStateManager.class.getSimpleName();
private static TetheringStateManager instance;
private WifiManagerWrapper wifiManager;
private TetheringStateManager() { }
public static TetheringStateManager getInstance() {
if (instance == null) {
instance = new TetheringStateManager();
}
return instance;
}
public void init(Context context) {
TetheringBroadcastReceiver broadcastReceiver = new TetheringBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter("android.net.conn.TETHER_STATE_CHANGED");
intentFilter.addAction("android.net.wifi.WIFI_AP_STATE_CHANGED");
context.getApplicationContext().registerReceiver(broadcastReceiver, intentFilter);
instance.wifiManager = new WifiManagerWrapper(context);
updateWifiTetheringState();
updateUsbTetheringState();
updateBluetoothTetheringState();
}
private static boolean isWifiApEnabled() throws Exception {
return instance.wifiManager.isWifiAPEnabled();
}
private static boolean getUsbTetheringState() {
try {
for(Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface networkInterface = en.nextElement();
if(!networkInterface.isLoopback()){
if(networkInterface.getName().contains("rndis") || networkInterface.getName().contains("usb")){
return true;
}
}
}
} catch(Exception e){
e.printStackTrace();
}
return false;
}
private static boolean isBluetoothTetheringEnabled() {
StringBuilder log = new StringBuilder();
boolean hasBtPan = false;
try {
hasBtPan = Cmd.runBlockingCmd(new String[] {"ifconfig bt-pan"}, log) == 0;
//Log.d(TAG, "ifconfig result: " + log.toString());
} catch (Exception e) {
e.printStackTrace();
}
return hasBtPan;
}
static void updateUsbTetheringState() {
TetheringObservable.setUsbTethering(getUsbTetheringState());
}
static void updateBluetoothTetheringState() {
TetheringObservable.setBluetoothTethering(isBluetoothTetheringEnabled());
}
static void updateWifiTetheringState() {
boolean lastState = TetheringObservable.getInstance().isWifiTetheringEnabled();
try {
boolean currentState = isWifiApEnabled();
if (currentState != lastState) {
TetheringObservable.setWifiTethering(currentState);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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