diff options
Diffstat (limited to 'app/src/main/java/se/leap/bitmaskclient/tethering/TetheringStateManager.java')
-rw-r--r-- | app/src/main/java/se/leap/bitmaskclient/tethering/TetheringStateManager.java | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/app/src/main/java/se/leap/bitmaskclient/tethering/TetheringStateManager.java b/app/src/main/java/se/leap/bitmaskclient/tethering/TetheringStateManager.java new file mode 100644 index 00000000..d3c934f6 --- /dev/null +++ b/app/src/main/java/se/leap/bitmaskclient/tethering/TetheringStateManager.java @@ -0,0 +1,181 @@ +/** + * 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 android.support.annotation.VisibleForTesting; + +import java.net.Inet4Address; +import java.net.InterfaceAddress; +import java.net.NetworkInterface; +import java.util.Enumeration; +import java.util.List; + +import se.leap.bitmaskclient.utils.Cmd; + +import static se.leap.bitmaskclient.utils.PreferenceHelper.isBluetoothTetheringAllowed; +import static se.leap.bitmaskclient.utils.PreferenceHelper.isUsbTetheringAllowed; +import static se.leap.bitmaskclient.utils.PreferenceHelper.isWifiTetheringAllowed; + +/** + * 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); + TetheringObservable.allowVpnWifiTethering(isWifiTetheringAllowed(context)); + TetheringObservable.allowVpnUsbTethering(isUsbTetheringAllowed(context)); + TetheringObservable.allowVpnBluetoothTethering(isBluetoothTetheringAllowed(context)); + updateWifiTetheringState(); + updateUsbTetheringState(); + updateBluetoothTetheringState(); + } + + static void updateWifiTetheringState() { + WifiManagerWrapper manager = getInstance().wifiManager; + try { + TetheringObservable.setWifiTethering(manager.isWifiAPEnabled(), getWifiAddressRange(), getWlanInterfaceName()); + } catch (Exception e) { + e.printStackTrace(); + } + } + + static void updateUsbTetheringState() { + TetheringObservable.setUsbTethering(isUsbTetheringEnabled(), getUsbAddressRange(), getUsbInterfaceName()); + } + + static void updateBluetoothTetheringState() { + //TetheringObservable.setBluetoothTethering(isBluetoothTetheringEnabled()); + } + + private static String getWifiAddressRange() { + String interfaceAddress = getInterfaceAddress(getWlanInterface()); + return getAddressRange(interfaceAddress); + } + + private static String getUsbAddressRange() { + String interfaceAddress = getInterfaceAddress(getUsbInterface()); + return getAddressRange(interfaceAddress); + } + + private static String getWlanInterfaceName() { + return getInterfaceName(getWlanInterface()); + } + + private static String getUsbInterfaceName() { + return getInterfaceName(getUsbInterface()); + } + + private static NetworkInterface getWlanInterface() { + return getNetworkInterface(new String[]{"wlan", "eth"}); + } + + private static NetworkInterface getUsbInterface() { + return getNetworkInterface(new String[]{"rndis", "usb"}); + } + + 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; + + } + + private static boolean isUsbTetheringEnabled() { + return getUsbInterface() != null; + } + + private static String getAddressRange(String interfaceAddress) { + if (interfaceAddress.split("\\.").length == 4) { + String result = interfaceAddress.substring(0, interfaceAddress.lastIndexOf(".")); + result = result + ".0/24"; + return result; + } + return ""; + } + + private static String getInterfaceAddress(NetworkInterface networkInterface) { + if (networkInterface != null) { + List<InterfaceAddress> ifaceAddresses = networkInterface.getInterfaceAddresses(); + for (InterfaceAddress ifaceAddres : ifaceAddresses) { + if (ifaceAddres.getAddress() instanceof Inet4Address) { + return ifaceAddres.getAddress().getHostAddress(); + } + } + } + return ""; + } + + private static String getInterfaceName(NetworkInterface networkInterface) { + if (networkInterface != null) { + return networkInterface.getName(); + } + return ""; + } + + private static NetworkInterface getNetworkInterface(String[] interfaceNames) { + try { + for(Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) { + NetworkInterface networkInterface = en.nextElement(); + if(!networkInterface.isLoopback()){ + for (String interfaceName : interfaceNames) { + if (networkInterface.getName().contains(interfaceName)) { + return networkInterface; + } + } + } + } + } catch(Exception e){ + e.printStackTrace(); + } + + return null; + } + +} |