1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/**
* 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 android.util.Log;
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();
}
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;
}
public static String getWifiAddressRange() {
String interfaceAddress = getWifiInterfaceAddress();
if (interfaceAddress.split("\\.").length == 4) {
String result = interfaceAddress.substring(0, interfaceAddress.lastIndexOf("."));
result = result + ".0/24";
return result;
}
return "";
}
@VisibleForTesting
static String getWifiInterfaceAddress() {
NetworkInterface networkInterface = getWlanInterface();
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 getWifiInterfaceName() {
NetworkInterface networkInterface = getWlanInterface();
if (networkInterface != null) {
return networkInterface.getName();
}
return "";
}
private static NetworkInterface getWlanInterface() {
try {
for(Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface networkInterface = en.nextElement();
if(!networkInterface.isLoopback()){
if(networkInterface.getName().contains("wlan") || networkInterface.getName().contains("eth")){
return networkInterface;
}
}
}
} catch(Exception e){
e.printStackTrace();
}
return null;
}
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() {
WifiManagerWrapper manager = getInstance().wifiManager;
try {
TetheringObservable.setWifiTethering(manager.isWifiAPEnabled(), getWifiAddressRange(), getWifiInterfaceName());
} catch (Exception e) {
e.printStackTrace();
}
}
}
|
