/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.connectivity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.hardware.usb.UsbManager;
import android.net.ConnectivityManager;
import android.net.IConnectivityManager;
import android.net.INetworkManagementEventObserver;
import android.net.INetworkStatsService;
import android.net.InterfaceConfiguration;
import android.net.LinkAddress;
import android.net.LinkProperties;
import android.net.NetworkInfo;
import android.net.NetworkUtils;
import android.os.Binder;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.INetworkManagementService;
import android.os.Looper;
import android.os.Message;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import android.util.Log;
import com.android.internal.telephony.Phone;
import com.android.internal.util.IState;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;
import com.google.android.collect.Lists;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Inet4Address;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;
/**
* @hide
*
* Timeout
*
* TODO - look for parent classes and code sharing
*/
public class Tethering extends INetworkManagementEventObserver.Stub {
private Context mContext;
private final static String TAG = "Tethering";
private final static boolean DBG = true;
private final static boolean VDBG = false;
// TODO - remove both of these - should be part of interface inspection/selection stuff
private String[] mTetherableUsbRegexs;
private String[] mTetherableWifiRegexs;
private String[] mTetherableBluetoothRegexs;
private Collection<Integer> mUpstreamIfaceTypes;
// used to synchronize public access to members
private Object mPublicSync;
private static final Integer MOBILE_TYPE = new Integer(ConnectivityManager.TYPE_MOBILE);
private static final Integer HIPRI_TYPE = new Integer(ConnectivityManager.TYPE_MOBILE_HIPRI);
private static final Integer DUN_TYPE = new Integer(ConnectivityManager.TYPE_MOBILE_DUN);
// if we have to connect to mobile, what APN type should we use? Calculated by examining the
// upstream type list and the DUN_REQUIRED secure-setting
private int mPreferredUpstreamMobileApn = ConnectivityManager.TYPE_NONE;
private final INetworkManagementService mNMService;
private final INetworkStatsService mStatsService;
private final IConnectivityManager mConnService;
private Looper mLooper;
private HandlerThread mThread;
private HashMap<String, TetherInterfaceSM> mIfaces; // all tethered/tetherable ifaces
private BroadcastReceiver mStateReceiver;
private static final String USB_NEAR_IFACE_ADDR = "192.168.42.129";
private static final int USB_PREFIX_LENGTH = 24;
// USB is 192.168.42.1 and 255.255.255.0
// Wifi is 192.168.43.1 and 255.255.255.0
// BT is limited to max default of 5 connections. 192.168.44.1 to 192.168.48.1
// with 255.255.255.0
private String[] mDhcpRange;
private static final String[] DHCP_DEFAULT_RANGE = {
"192.168.42.2", "192.168.42.254", "192.168.43.2", "192.168.43.254",
"192.168.44.2", "192.168.44.254", "192.168.45.2", "192.168.45.254",
"192.168.46.2", "192.168.46.254", "192.168.47.2", "192.168.47.254",
"192.168.48.2", "192.168.48.254",
};
private String[] mDefaultDnsServers;
private static final String DNS_DEFAULT_SERVER1 = "8.8.8.8";
private static final String DNS_DEFAULT_SERVER2 = "8.8.4.4";
private StateMachine mTetherMasterSM;
private Notification mTetheredNotification;
private boolean mRndisEnabled; // track the RNDIS function enabled state
private boolean mUsbTetherRequested; // true if USB tethering should be started
// when RNDIS is enabled
public Tethering(Context context, INetworkManagementService nmService,
INetworkStatsService statsService, IConnectivityManager connService, Looper looper) {
mContext = context;
mNMService = nmService;
mStatsService = statsService;
mConnService = connService;
mLooper = looper;
mPublicSync = new Object();
mIfaces = new HashMap<String, TetherInterfaceSM>();
// make our own thread so we don't anr the system
mThread = new HandlerThread("Tethering");
mThread.start();
mLooper = mThread.getLooper();
mTetherMasterSM = new TetherMasterSM("TetherMaster", mLooper);
mTetherMasterSM.start();
mStateReceiver = new StateReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(UsbManager.ACTION_USB_STATE);
filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
mContext.registerReceiver(mStateReceiver, filter);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_MEDIA_SHARED);
filter.addAction(Intent.ACTION_MEDIA_UNSHARED);
filter.addDataScheme("file");
mContext.registerReceiver(mStateReceiver, filter);
mDhcpRange = context.getResources().getStringArray(
com.android.internal.R.array.config_tether_dhcp_range);
if ((mDhcpRange.length == 0) || (mDhcpRange.length % 2 ==1)) {
mDhcpRange = DHCP_DEFAULT_RANGE;
}
// load device config info
updateConfiguration();
// TODO - remove and rely on real notifications of the current iface
mDefaultDnsServers = new String[2];
mDefaultDnsServers[0] = DNS_DEFAULT_SERVER1;
mDefaultDnsServers[1] = DNS_DEFAULT_SERVER2;
}
void updateConfiguration() {
String[] tetherableUsbRegexs = mContext.getResources().getStringArray(
com.android.internal.R.array.config_tether_usb_regexs);
String[] tetherableWifiRegexs = mContext.getResources().getStringArray(
com.android.internal.R.array.config_tether_wifi_regexs);
String[] tetherableBluetoothRegexs = mContext.getResources().getStringArray(
com.android.internal.R.array.config_tether_bluetooth_regexs);
int ifaceTypes[] = mContext.getResources().getIntArray(
com.android.internal.R.array.config_tether_upstream_types);
Collection<Integer> upstreamIfaceTypes = new ArrayList();
for (int i : ifaceTypes) {
upstreamIfaceTypes.add(new Integer(i));
}
synchronized (mPublicSync) {
mTetherableUsbRegexs = tetherableUsbRegexs;
mTetherableWifiRegexs = tetherableWifiRegexs;
mTetherableBluetoothRegexs = tetherableBluetoothRegexs;
mUpstreamIfaceTypes = upstreamIfaceTypes;
}
// check if the upstream type list needs to be modified due to secure-settings
checkDunRequired();
}
public void interfaceStatusChanged(String iface, boolean up) {
if (VDBG) Log.d(TAG, "interfaceStatusChanged " + iface + ", " + up);
boolean found = false;
boolean usb = false;
synchronized (mPublicSync) {
if (isWifi(iface)) {
found = true;
} else if (isUsb(iface)) {
found = true;
usb = true;
} else if (isBluetooth(iface)) {
found = true;
}
if (found == false) return;
TetherInterfaceSM sm = mIfaces.get(iface);
if (up) {
if (sm == null) {
sm = new TetherInterfaceSM(iface, mLooper, usb);
mIfaces.put(iface, sm);
sm.start();
}
} else {
if (isUsb(iface)) {
// ignore usb0 down after enabling RNDIS
// we will handle disconnect in interfaceRemoved instead
if (VDBG) Log.d(TAG, "ignore interface down for " + iface);
} else if (sm != null) {
sm.sendMessage(TetherInterfaceSM.CMD_INTERFACE_DOWN);
mIfaces.remove(iface);
}
}
}
}
public void interfaceLinkStateChanged(String iface, boolean up) {
if (VDBG) Log.d(TAG, "interfaceLinkStateChanged " + iface + ", " + up);
interfaceStatusChanged(iface, up);
}
private boolean isUsb(String iface) {
synchronized (mPublicSync) {
for (String regex : mTetherableUsbRegexs) {
if (iface.matches(regex)) return true;
}
return false;
}
}
public boolean isWifi(String iface) {
synchronized (mPublicSync) {
for (String regex : mTetherableWifiRegexs) {
if (iface.matches(regex)) return true;
}
return false;
}
}
public boolean isBluetooth(String iface) {
synchronized (mPublicSync) {
for (String regex : mTetherableBluetoothRegexs) {
if (iface.matches(regex)) return true;
}
return false;
}
}
public void interfaceAdded(String iface) {
if (VDBG) Log.d(TAG, "interfaceAdded " + iface);
boolean found = false;
boolean usb = false;
synchronized (mPublicSync) {
if (isWifi(iface)) {
found = true;
}
if (isUsb(iface)) {
found = true;
usb = true;
}
if (isBluetooth(iface)) {
found = true;
}
if (found == false) {
if (VDBG) Log.d(TAG, iface + " is not a tetherable iface, ignoring");
return;
}
TetherInterfaceSM sm = mIfaces.get(iface);
if (sm != null) {
if (VDBG) Log.d(TAG, "active iface (" + iface + ") reported as added, ignoring");
return;
}
sm = new TetherInterfaceSM(iface, mLooper, usb);
mIfaces.put(iface, sm);
sm.start();
}
}
public void interfaceRemoved(String iface) {
if (VDBG) Log.d(TAG, "interfaceRemoved " + iface);
synchronized (mPublicSync) {
TetherInterfaceSM sm = mIfaces.get(iface);
if (sm == null) {
if (VDBG) {
Log.e(TAG, "attempting to remove unknown iface (" + iface + "), ignoring");
}
return;
}
sm.sendMessage(TetherInterfaceSM.CMD_INTERFACE_DOWN);
mIfaces.remove(iface);
}
}
public void limitReached(String limitName, String iface) {}
public int tether(String iface) {
if (DBG) Log.d(TAG, "Tethering " + iface);
TetherInterfaceSM sm = null;
synchronized (mPublicSync) {
sm = mIfaces.get(iface);
}
if (sm == null) {
Log.e(TAG, "Tried to Tether an unknown iface :" + iface + ", ignoring");
return ConnectivityManager.TETHER_ERROR_UNKNOWN_IFACE;
}
if (!sm.isAvailable() && !sm.isErrored()) {
Log.e(TAG, "Tried to Tether an unavailable iface :" + iface + ", ignoring");
return ConnectivityManager.TETHER_ERROR_UNAVAIL_IFACE;
}
sm.sendMessage(TetherInterfaceSM.CMD_TETHER_REQUESTED);
return ConnectivityManager.TETHER_ERROR_NO_ERROR;
}
public int untether(String iface) {
if (DBG) Log.d(TAG, "Untethering " + iface);
TetherInterfaceSM sm = null;
synchronized (mPublicSync) {
sm = mIfaces.get(iface);
}
if (sm == null) {
Log.e(TAG, "Tried to Untether an unknown iface :" + iface + ", ignoring");
return ConnectivityManager.TETHER_ERROR_UNKNOWN_IFACE;
}
if (sm.isErrored()) {
Log.e(TAG, "Tried to Untethered an errored iface :" + iface + ", ignoring");
return ConnectivityManager.TETHER_ERROR_UNAVAIL_IFACE;
}
sm.sendMessage(TetherInterfaceSM.CMD_TETHER_UNREQUESTED);
return ConnectivityManager.TETHER_ERROR_NO_ERROR;
}
public int getLastTetherError(String iface) {
TetherInterfaceSM sm = null;
synchronized (mPublicSync) {
sm = mIfaces.get(iface);
if (sm == null) {
Log.e(TAG, "Tried to getLastTetherError on an unknown iface :" + iface +
", ignoring");
return ConnectivityManager.TETHER_ERROR_UNKNOWN_IFACE;
}
return sm.getLastError();
}
}
// TODO - move all private methods used only by the state machine into the state machine
// to clarify what needs synchronized protection.
private void sendTetherStateChangedBroadcast() {
try {
if (!mConnService.isTetheringSupported()) return;
} catch (RemoteException e) {
return;
}
ArrayList<String> availableList = new ArrayList<String>();
ArrayList<String> activeList = new ArrayList<String>();
ArrayList<String> erroredList = new ArrayList<String>();
boolean wifiTethered = false;
boolean usbTethered = false;
boolean bluetoothTethered = false;
synchronized (mPublicSync) {
Set ifaces = mIfaces.keySet();
for (Object iface : ifaces) {
TetherInterfaceSM sm = mIfaces.get(iface);
if (sm != null) {
if (sm.isErrored()) {
erroredList.add((String)iface);
} else if (sm.isAvailable()) {
availableList.add((String)iface);
} else if (sm.isTethered()) {
if (isUsb((String)iface)) {
usbTethered = true;
} else if (isWifi((String)iface)) {
wifiTethered = true;
} else if (isBluetooth((String)iface)) {
bluetoothTethered = true;
}
activeList.add((String)iface);
}
}
}
}
Intent broadcast = new Intent(ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
broadcast.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING |
Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
broadcast.putStringArrayListExtra(ConnectivityManager.EXTRA_AVAILABLE_TETHER,
availableList);
broadcast.putStringArrayListExtra(ConnectivityManager.EXTRA_ACTIVE_TETHER, activeList);
broadcast.putStringArrayListExtra(ConnectivityManager.EXTRA_ERRORED_TETHER,
erroredList);
mContext.sendStickyBroadcast(broadcast);
if (DBG) {
Log.d(TAG, "sendTetherStateChangedBroadcast " + availableList.size() + ", " +
activeList.size() + ", " + erroredList.size());
}
if (usbTethered) {
if (wifiTethered || bluetoothTethered) {
showTetheredNotification(com.android.internal.R.drawable.stat_sys_tether_general);
} else {
showTetheredNotification(com.android.internal.R.drawable.stat_sys_tether_usb);
}
} else if (wifiTethered) {
if (bluetoothTethered) {
showTetheredNotification(com.android.internal.R.drawable.stat_sys_tether_general);
} else {
showTetheredNotification(com.android.internal.R.drawable.stat_sys_tether_wifi);
}
} else if (bluetoothTethered) {
showTetheredNotification(com.android.internal.R.drawable.stat_sys_tether_bluetooth);
} else {
clearTetheredNotification();
}
}
private void showTetheredNotification(int icon) {
NotificationManager notificationManager =
(NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (notificationManager == null) {
return;
}
if (mTetheredNotification != null) {
if (mTetheredNotification.icon == icon) {
return;
}
notificationManager.cancel(mTetheredNotification.icon);
}
Intent intent = new Intent();
intent.setClassName("com.android.settings", "com.android.settings.TetherSettings");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
PendingIntent pi = PendingIntent.getActivity(mContext, 0, intent, 0);
Resources r = Resources.getSystem();
CharSequence title = r.getText(com.android.internal.R.string.tethered_notification_title);
CharSequence message = r.getText(com.android.internal.R.string.
tethered_notification_message);
if (mTetheredNotification == null) {
mTetheredNotification = new Notification();
mTetheredNotification.when = 0;
}
mTetheredNotification.icon = icon;
mTetheredNotification.defaults &= ~Notification.DEFAULT_SOUND;
mTetheredNotification.flags = Notification.FLAG_ONGOING_EVENT;
mTetheredNotification.tickerText = title;
mTetheredNotification.setLatestEventInfo(mContext, title, message, pi);
notificationManager.notify(mTetheredNotification.icon, mTetheredNotification);
}
private void clearTetheredNotification() {
NotificationManager notificationManager =
(NotificationManager)mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (notificationManager != null && mTetheredNotification != null) {
notificationManager.cancel(mTetheredNotification.icon);
mTetheredNotification = null;
}
}
private class StateReceiver extends BroadcastReceiver {
public void onReceive(Context content, Intent intent) {
String action = intent.getAction();
if (action.equals(UsbManager.ACTION_USB_STATE)) {
synchronized (Tethering.this.mPublicSync) {
boolean usbConnected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
mRndisEnabled = intent.getBooleanExtra(UsbManager.USB_FUNCTION_RNDIS, false);
// start tethering if we have a request pending
if (usbConnected && mRndisEnabled && mUsbTetherRequested) {
tetherUsb(true);
}
mUsbTetherRequested = false;
}
} else if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {
if (VDBG) Log.d(TAG, "Tethering got CONNECTIVITY_ACTION");
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_UPSTREAM_CHANGED);
}
}
}
private void tetherUsb(boolean enable) {
if (VDBG) Log.d(TAG, "tetherUsb " + enable);
String[] ifaces = new String[0];
try {
ifaces = mNMService.listInterfaces();
} catch (Exception e) {
Log.e(TAG, "Error listing Interfaces", e);
return;
}
for (String iface : ifaces) {
if (isUsb(iface)) {
int result = (enable ? tether(iface) : untether(iface));
if (result == ConnectivityManager.TETHER_ERROR_NO_ERROR) {
return;
}
}
}
Log.e(TAG, "unable start or stop USB tethering");
}
// configured when we start tethering and unconfig'd on error or conclusion
private boolean configureUsbIface(boolean enabled) {
if (VDBG) Log.d(TAG, "configureUsbIface(" + enabled + ")");
// toggle the USB interfaces
String[] ifaces = new String[0];
try {
ifaces = mNMService.listInterfaces();
} catch (Exception e) {
Log.e(TAG, "Error listing Interfaces", e);
return false;
}
for (String iface : ifaces) {
if (isUsb(iface)) {
InterfaceConfiguration ifcg = null;
try {
ifcg = mNMService.getInterfaceConfig(iface);
if (ifcg != null) {
InetAddress addr = NetworkUtils.numericToInetAddress(USB_NEAR_IFACE_ADDR);
ifcg.addr = new LinkAddress(addr, USB_PREFIX_LENGTH);
if (enabled) {
ifcg.interfaceFlags = ifcg.interfaceFlags.replace("down", "up");
} else {
ifcg.interfaceFlags = ifcg.interfaceFlags.replace("up", "down");
}
ifcg.interfaceFlags = ifcg.interfaceFlags.replace("running", "");
ifcg.interfaceFlags = ifcg.interfaceFlags.replace(" "," ");
mNMService.setInterfaceConfig(iface, ifcg);
}
} catch (Exception e) {
Log.e(TAG, "Error configuring interface " + iface, e);
return false;
}
}
}
return true;
}
// TODO - return copies so people can't tamper
public String[] getTetherableUsbRegexs() {
return mTetherableUsbRegexs;
}
public String[] getTetherableWifiRegexs() {
return mTetherableWifiRegexs;
}
public String[] getTetherableBluetoothRegexs() {
return mTetherableBluetoothRegexs;
}
public int setUsbTethering(boolean enable) {
if (VDBG) Log.d(TAG, "setUsbTethering(" + enable + ")");
UsbManager usbManager = (UsbManager)mContext.getSystemService(Context.USB_SERVICE);
synchronized (mPublicSync) {
if (enable) {
if (mRndisEnabled) {
tetherUsb(true);
} else {
mUsbTetherRequested = true;
usbManager.setCurrentFunction(UsbManager.USB_FUNCTION_RNDIS, false);
}
} else {
tetherUsb(false);
if (mRndisEnabled) {
usbManager.setCurrentFunction(null, false);
}
mUsbTetherRequested = false;
}
}
return ConnectivityManager.TETHER_ERROR_NO_ERROR;
}
public int[] getUpstreamIfaceTypes() {
int values[];
synchronized (mPublicSync) {
updateConfiguration();
values = new int[mUpstreamIfaceTypes.size()];
Iterator<Integer> iterator = mUpstreamIfaceTypes.iterator();
for (int i=0; i < mUpstreamIfaceTypes.size(); i++) {
values[i] = iterator.next();
}
}
return values;
}
public void checkDunRequired() {
int secureSetting = Settings.Secure.getInt(mContext.getContentResolver(),
Settings.Secure.TETHER_DUN_REQUIRED, 2);
synchronized (mPublicSync) {
// 2 = not set, 0 = DUN not required, 1 = DUN required
if (secureSetting != 2) {
int requiredApn = (secureSetting == 1 ?
ConnectivityManager.TYPE_MOBILE_DUN :
ConnectivityManager.TYPE_MOBILE_HIPRI);
if (requiredApn == ConnectivityManager.TYPE_MOBILE_DUN) {
while (mUpstreamIfaceTypes.contains(MOBILE_TYPE)) {
mUpstreamIfaceTypes.remove(MOBILE_TYPE);
}
while (mUpstreamIfaceTypes.contains(HIPRI_TYPE)) {
mUpstreamIfaceTypes.remove(HIPRI_TYPE);
}
if (mUpstreamIfaceTypes.contains(DUN_TYPE) == false) {
mUpstreamIfaceTypes.add(DUN_TYPE);
}
} else {
while (mUpstreamIfaceTypes.contains(DUN_TYPE)) {
mUpstreamIfaceTypes.remove(DUN_TYPE);
}
if (mUpstreamIfaceTypes.contains(MOBILE_TYPE) == false) {
mUpstreamIfaceTypes.add(MOBILE_TYPE);
}
if (mUpstreamIfaceTypes.contains(HIPRI_TYPE) == false) {
mUpstreamIfaceTypes.add(HIPRI_TYPE);
}
}
}
if (mUpstreamIfaceTypes.contains(DUN_TYPE)) {
mPreferredUpstreamMobileApn = ConnectivityManager.TYPE_MOBILE_DUN;
} else {
mPreferredUpstreamMobileApn = ConnectivityManager.TYPE_MOBILE_HIPRI;
}
}
}
// TODO review API - maybe return ArrayList<String> here and below?
public String[] getTetheredIfaces() {
ArrayList<String> list = new ArrayList<String>();
synchronized (mPublicSync) {
Set keys = mIfaces.keySet();
for (Object key : keys) {
TetherInterfaceSM sm = mIfaces.get(key);
if (sm.isTethered()) {
list.add((String)key);
}
}
}
String[] retVal = new String[list.size()];
for (int i=0; i < list.size(); i++) {
retVal[i] = list.get(i);
}
return retVal;
}
public String[] getTetheredIfacePairs() {
final ArrayList<String> list = Lists.newArrayList();
synchronized (mPublicSync) {
for (TetherInterfaceSM sm : mIfaces.values()) {
if (sm.isTethered()) {
list.add(sm.mMyUpstreamIfaceName);
list.add(sm.mIfaceName);
}
}
}
return list.toArray(new String[list.size()]);
}
public String[] getTetherableIfaces() {
ArrayList<String> list = new ArrayList<String>();
synchronized (mPublicSync) {
Set keys = mIfaces.keySet();
for (Object key : keys) {
TetherInterfaceSM sm = mIfaces.get(key);
if (sm.isAvailable()) {
list.add((String)key);
}
}
}
String[] retVal = new String[list.size()];
for (int i=0; i < list.size(); i++) {
retVal[i] = list.get(i);
}
return retVal;
}
public String[] getErroredIfaces() {
ArrayList<String> list = new ArrayList<String>();
synchronized (mPublicSync) {
Set keys = mIfaces.keySet();
for (Object key : keys) {
TetherInterfaceSM sm = mIfaces.get(key);
if (sm.isErrored()) {
list.add((String)key);
}
}
}
String[] retVal = new String[list.size()];
for (int i= 0; i< list.size(); i++) {
retVal[i] = list.get(i);
}
return retVal;
}
//TODO: Temporary handling upstream change triggered without
// CONNECTIVITY_ACTION. Only to accomodate interface
// switch during HO.
// @see bug/4455071
public void handleTetherIfaceChange() {
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_UPSTREAM_CHANGED);
}
class TetherInterfaceSM extends StateMachine {
// notification from the master SM that it's not in tether mode
static final int CMD_TETHER_MODE_DEAD = 1;
// request from the user that it wants to tether
static final int CMD_TETHER_REQUESTED = 2;
// request from the user that it wants to untether
static final int CMD_TETHER_UNREQUESTED = 3;
// notification that this interface is down
static final int CMD_INTERFACE_DOWN = 4;
// notification that this interface is up
static final int CMD_INTERFACE_UP = 5;
// notification from the master SM that it had an error turning on cellular dun
static final int CMD_CELL_DUN_ERROR = 6;
// notification from the master SM that it had trouble enabling IP Forwarding
static final int CMD_IP_FORWARDING_ENABLE_ERROR = 7;
// notification from the master SM that it had trouble disabling IP Forwarding
static final int CMD_IP_FORWARDING_DISABLE_ERROR = 8;
// notification from the master SM that it had trouble staring tethering
static final int CMD_START_TETHERING_ERROR = 9;
// notification from the master SM that it had trouble stopping tethering
static final int CMD_STOP_TETHERING_ERROR = 10;
// notification from the master SM that it had trouble setting the DNS forwarders
static final int CMD_SET_DNS_FORWARDERS_ERROR = 11;
// the upstream connection has changed
static final int CMD_TETHER_CONNECTION_CHANGED = 12;
private State mDefaultState;
private State mInitialState;
private State mStartingState;
private State mTetheredState;
private State mUnavailableState;
private boolean mAvailable;
private boolean mTethered;
int mLastError;
String mIfaceName;
String mMyUpstreamIfaceName; // may change over time
boolean mUsb;
TetherInterfaceSM(String name, Looper looper, boolean usb) {
super(name, looper);
mIfaceName = name;
mUsb = usb;
setLastError(ConnectivityManager.TETHER_ERROR_NO_ERROR);
mInitialState = new InitialState();
addState(mInitialState);
mStartingState = new StartingState();
addState(mStartingState);
mTetheredState = new TetheredState();
addState(mTetheredState);
mUnavailableState = new UnavailableState();
addState(mUnavailableState);
setInitialState(mInitialState);
}
public String toString() {
String res = new String();
res += mIfaceName + " - ";
IState current = getCurrentState();
if (current == mInitialState) res += "InitialState";
if (current == mStartingState) res += "StartingState";
if (current == mTetheredState) res += "TetheredState";
if (current == mUnavailableState) res += "UnavailableState";
if (mAvailable) res += " - Available";
if (mTethered) res += " - Tethered";
res += " - lastError =" + mLastError;
return res;
}
public int getLastError() {
synchronized (Tethering.this.mPublicSync) {
return mLastError;
}
}
private void setLastError(int error) {
synchronized (Tethering.this.mPublicSync) {
mLastError = error;
if (isErrored()) {
if (mUsb) {
// note everything's been unwound by this point so nothing to do on
// further error..
Tethering.this.configureUsbIface(false);
}
}
}
}
public boolean isAvailable() {
synchronized (Tethering.this.mPublicSync) {
return mAvailable;
}
}
private void setAvailable(boolean available) {
synchronized (Tethering.this.mPublicSync) {
mAvailable = available;
}
}
public boolean isTethered() {
synchronized (Tethering.this.mPublicSync) {
return mTethered;
}
}
private void setTethered(boolean tethered) {
synchronized (Tethering.this.mPublicSync) {
mTethered = tethered;
}
}
public boolean isErrored() {
synchronized (Tethering.this.mPublicSync) {
return (mLastError != ConnectivityManager.TETHER_ERROR_NO_ERROR);
}
}
class InitialState extends State {
@Override
public void enter() {
setAvailable(true);
setTethered(false);
sendTetherStateChangedBroadcast();
}
@Override
public boolean processMessage(Message message) {
if (DBG) Log.d(TAG, "InitialState.processMessage what=" + message.what);
boolean retValue = true;
switch (message.what) {
case CMD_TETHER_REQUESTED:
setLastError(ConnectivityManager.TETHER_ERROR_NO_ERROR);
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_TETHER_MODE_REQUESTED,
TetherInterfaceSM.this);
transitionTo(mStartingState);
break;
case CMD_INTERFACE_DOWN:
transitionTo(mUnavailableState);
break;
default:
retValue = false;
break;
}
return retValue;
}
}
class StartingState extends State {
@Override
public void enter() {
setAvailable(false);
if (mUsb) {
if (!Tethering.this.configureUsbIface(true)) {
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_TETHER_MODE_UNREQUESTED,
TetherInterfaceSM.this);
setLastError(ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR);
transitionTo(mInitialState);
return;
}
}
sendTetherStateChangedBroadcast();
// Skipping StartingState
transitionTo(mTetheredState);
}
@Override
public boolean processMessage(Message message) {
if (DBG) Log.d(TAG, "StartingState.processMessage what=" + message.what);
boolean retValue = true;
switch (message.what) {
// maybe a parent class?
case CMD_TETHER_UNREQUESTED:
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_TETHER_MODE_UNREQUESTED,
TetherInterfaceSM.this);
if (mUsb) {
if (!Tethering.this.configureUsbIface(false)) {
setLastErrorAndTransitionToInitialState(
ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR);
break;
}
}
transitionTo(mInitialState);
break;
case CMD_CELL_DUN_ERROR:
case CMD_IP_FORWARDING_ENABLE_ERROR:
case CMD_IP_FORWARDING_DISABLE_ERROR:
case CMD_START_TETHERING_ERROR:
case CMD_STOP_TETHERING_ERROR:
case CMD_SET_DNS_FORWARDERS_ERROR:
setLastErrorAndTransitionToInitialState(
ConnectivityManager.TETHER_ERROR_MASTER_ERROR);
break;
case CMD_INTERFACE_DOWN:
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_TETHER_MODE_UNREQUESTED,
TetherInterfaceSM.this);
transitionTo(mUnavailableState);
break;
default:
retValue = false;
}
return retValue;
}
}
class TetheredState extends State {
@Override
public void enter() {
try {
mNMService.tetherInterface(mIfaceName);
} catch (Exception e) {
Log.e(TAG, "Error Tethering: " + e.toString());
setLastError(ConnectivityManager.TETHER_ERROR_TETHER_IFACE_ERROR);
transitionTo(mInitialState);
return;
}
if (DBG) Log.d(TAG, "Tethered " + mIfaceName);
setAvailable(false);
setTethered(true);
sendTetherStateChangedBroadcast();
}
private void cleanupUpstream() {
if (mMyUpstreamIfaceName != null) {
// note that we don't care about errors here.
// sometimes interfaces are gone before we get
// to remove their rules, which generates errors.
// just do the best we can.
try {
// about to tear down NAT; gather remaining statistics
mStatsService.forceUpdate();
} catch (Exception e) {
if (VDBG) Log.e(TAG, "Exception in forceUpdate: " + e.toString());
}
try {
mNMService.disableNat(mIfaceName, mMyUpstreamIfaceName);
} catch (Exception e) {
if (VDBG) Log.e(TAG, "Exception in disableNat: " + e.toString());
}
mMyUpstreamIfaceName = null;
}
return;
}
@Override
public boolean processMessage(Message message) {
if (DBG) Log.d(TAG, "TetheredState.processMessage what=" + message.what);
boolean retValue = true;
boolean error = false;
switch (message.what) {
case CMD_TETHER_UNREQUESTED:
case CMD_INTERFACE_DOWN:
cleanupUpstream();
try {
mNMService.untetherInterface(mIfaceName);
} catch (Exception e) {
setLastErrorAndTransitionToInitialState(
ConnectivityManager.TETHER_ERROR_UNTETHER_IFACE_ERROR);
break;
}
mTetherMasterSM.sendMessage(TetherMasterSM.CMD_TETHER_MODE_UNREQUESTED,
TetherInterfaceSM.this);
if (message.what == CMD_TETHER_UNREQUESTED) {
if (mUsb) {
if (!Tethering.this.configureUsbIface(false)) {
setLastError(
ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR);
}
}
transitionTo(mInitialState);
} else if (message.what == CMD_INTERFACE_DOWN) {
transitionTo(mUnavailableState);
}
if (DBG) Log.d(TAG, "Untethered " + mIfaceName);
break;
case CMD_TETHER_CONNECTION_CHANGED:
String newUpstreamIfaceName = (String)(message.obj);
if ((mMyUpstreamIfaceName == null && newUpstreamIfaceName == null) ||
(mMyUpstreamIfaceName != null &&
mMyUpstreamIfaceName.equals(newUpstreamIfaceName))) {
if (VDBG) Log.d(TAG, "Connection changed noop - dropping");
break;
}
cleanupUpstream();
if (newUpstreamIfaceName != null) {
try {
mNMService.enableNat(mIfaceName, newUpstreamIfaceName);
} catch (Exception e) {
Log.e(TAG, "Exception enabling Nat: " + e.toString());
try {
mNMService.untetherInterface(mIfaceName);
} catch (Exception ee) {}
setLastError(ConnectivityManager.TETHER_ERROR_ENABLE_NAT_ERROR);
transitionTo(mInitialState);
return true;
}
}
mMyUpstreamIfaceName = newUpstreamIfaceName;
break;
case CMD_CELL_DUN_ERROR:
case CMD_IP_FORWARDING_ENABLE_ERROR:
case CMD_IP_FORWARDING_DISABLE_ERROR:
case CMD_START_TETHERING_ERROR:
case CMD_STOP_TETHERING_ERROR:
case CMD_SET_DNS_FORWARDERS_ERROR:
error = true;
// fall through
case CMD_TETHER_MODE_DEAD:
cleanupUpstream();
try {
mNMService.untetherInterface(mIfaceName);
} catch (Exception e) {
setLastErrorAndTransitionToInitialState(
ConnectivityManager.TETHER_ERROR_UNTETHER_IFACE_ERROR);
break;
}
if (error) {
setLastErrorAndTransitionToInitialState(
ConnectivityManager.TETHER_ERROR_MASTER_ERROR);
break;
}
if (DBG) Log.d(TAG, "Tether lost upstream connection " + mIfaceName);
sendTetherStateChangedBroadcast();
if (mUsb) {
if (!Tethering.this.configureUsbIface(false)) {
setLastError(ConnectivityManager.TETHER_ERROR_IFACE_CFG_ERROR);
}
}
transitionTo(mInitialState);
break;
default:
retValue = false;
break;
}
return retValue;
}
}
class UnavailableState extends State {
@Override
public void enter() {
setAvailable(false);
setLastError(ConnectivityManager.TETHER_ERROR_NO_ERROR);
setTethered(false);
sendTetherStateChangedBroadcast();
}
@Override
public boolean processMessage(Message message) {
boolean retValue = true;
switch (message.what) {
case CMD_INTERFACE_UP:
transitionTo(mInitialState);
break;
default:
retValue = false;
break;
}
return retValue;
}
}
void setLastErrorAndTransitionToInitialState(int error) {
setLastError(error);
transitionTo(mInitialState);
}
}
class TetherMasterSM extends StateMachine {
// an interface SM has requested Tethering
static final int CMD_TETHER_MODE_REQUESTED = 1;
// an interface SM has unrequested Tethering
static final int CMD_TETHER_MODE_UNREQUESTED = 2;
// upstream connection change - do the right thing
static final int CMD_UPSTREAM_CHANGED = 3;
// we received notice that the cellular DUN connection is up
static final int CMD_CELL_CONNECTION_RENEW = 4;
// we don't have a valid upstream conn, check again after a delay
static final int CMD_RETRY_UPSTREAM = 5;
// This indicates what a timeout event relates to. A state that
// sends itself a delayed timeout event and handles incoming timeout events
// should inc this when it is entered and whenever it sends a new timeout event.
// We do not flush the old ones.
private int mSequenceNumber;
private State mInitialState;
private State mTetherModeAliveState;
private State mSetIpForwardingEnabledErrorState;
private State mSetIpForwardingDisabledErrorState;
private State mStartTetheringErrorState;
private State mStopTetheringErrorState;
private State mSetDnsForwardersErrorState;
private ArrayList mNotifyList;
private int mCurrentConnectionSequence;
private int mMobileApnReserved = ConnectivityManager.TYPE_NONE;
private String mUpstreamIfaceName = null;
private static final int UPSTREAM_SETTLE_TIME_MS = 10000;
private static final int CELL_CONNECTION_RENEW_MS = 40000;
TetherMasterSM(String name, Looper looper) {
super(name, looper);
//Add states
mInitialState = new InitialState();
addState(mInitialState);
mTetherModeAliveState = new TetherModeAliveState();
addState(mTetherModeAliveState);
mSetIpForwardingEnabledErrorState = new SetIpForwardingEnabledErrorState();
addState(mSetIpForwardingEnabledErrorState);
mSetIpForwardingDisabledErrorState = new SetIpForwardingDisabledErrorState();
addState(mSetIpForwardingDisabledErrorState);
mStartTetheringErrorState = new StartTetheringErrorState();
addState(mStartTetheringErrorState);
mStopTetheringErrorState = new StopTetheringErrorState();
addState(mStopTetheringErrorState);
mSetDnsForwardersErrorState = new SetDnsForwardersErrorState();
addState(mSetDnsForwardersErrorState);
mNotifyList = new ArrayList();
setInitialState(mInitialState);
}
class TetherMasterUtilState extends State {
protected final static boolean TRY_TO_SETUP_MOBILE_CONNECTION = true;
protected final static boolean WAIT_FOR_NETWORK_TO_SETTLE = false;
@Override
public boolean processMessage(Message m) {
return false;
}
protected String enableString(int apnType) {
switch (apnType) {
case ConnectivityManager.TYPE_MOBILE_DUN:
return Phone.FEATURE_ENABLE_DUN_ALWAYS;
case ConnectivityManager.TYPE_MOBILE:
case ConnectivityManager.TYPE_MOBILE_HIPRI:
return Phone.FEATURE_ENABLE_HIPRI;
}
return null;
}
protected boolean turnOnUpstreamMobileConnection(int apnType) {
boolean retValue = true;
if (apnType == ConnectivityManager.TYPE_NONE) return false;
if (apnType != mMobileApnReserved) turnOffUpstreamMobileConnection();
int result = Phone.APN_REQUEST_FAILED;
String enableString = enableString(apnType);
if (enableString == null) return false;
try {
result = mConnService.startUsingNetworkFeature(ConnectivityManager.TYPE_MOBILE,
enableString, new Binder());
} catch (Exception e) {
}
switch (result) {
case Phone.APN_ALREADY_ACTIVE:
case Phone.APN_REQUEST_STARTED:
mMobileApnReserved = apnType;
Message m = obtainMessage(CMD_CELL_CONNECTION_RENEW);
m.arg1 = ++mCurrentConnectionSequence;
sendMessageDelayed(m, CELL_CONNECTION_RENEW_MS);
break;
case Phone.APN_REQUEST_FAILED:
default:
retValue = false;
break;
}
return retValue;
}
protected boolean turnOffUpstreamMobileConnection() {
if (mMobileApnReserved != ConnectivityManager.TYPE_NONE) {
try {
mConnService.stopUsingNetworkFeature(ConnectivityManager.TYPE_MOBILE,
enableString(mMobileApnReserved));
} catch (Exception e) {
return false;
}
mMobileApnReserved = ConnectivityManager.TYPE_NONE;
}
return true;
}
protected boolean turnOnMasterTetherSettings() {
try {
mNMService.setIpForwardingEnabled(true);
} catch (Exception e) {
transitionTo(mSetIpForwardingEnabledErrorState);
return false;
}
try {
mNMService.startTethering(mDhcpRange);
} catch (Exception e) {
try {
mNMService.stopTethering();
mNMService.startTethering(mDhcpRange);
} catch (Exception ee) {
transitionTo(mStartTetheringErrorState);
return false;
}
}
try {
mNMService.setDnsForwarders(mDefaultDnsServers);
} catch (Exception e) {
transitionTo(mSetDnsForwardersErrorState);
return false;
}
return true;
}
protected boolean turnOffMasterTetherSettings() {
try {
mNMService.stopTethering();
} catch (Exception e) {
transitionTo(mStopTetheringErrorState);
return false;
}
try {
mNMService.setIpForwardingEnabled(false);
} catch (Exception e) {
transitionTo(mSetIpForwardingDisabledErrorState);
return false;
}
transitionTo(mInitialState);
return true;
}
protected void chooseUpstreamType(boolean tryCell) {
int upType = ConnectivityManager.TYPE_NONE;
String iface = null;
updateConfiguration();
synchronized (mPublicSync) {
if (VDBG) {
Log.d(TAG, "chooseUpstreamType has upstream iface types:");
for (Integer netType : mUpstreamIfaceTypes) {
Log.d(TAG, " " + netType);
}
}
for (Integer netType : mUpstreamIfaceTypes) {
NetworkInfo info = null;
try {
info = mConnService.getNetworkInfo(netType.intValue());
} catch (RemoteException e) { }
if ((info != null) && info.isConnected()) {
upType = netType.intValue();
break;
}
}
}
if (DBG) {
Log.d(TAG, "chooseUpstreamType(" + tryCell + "), preferredApn ="
+ mPreferredUpstreamMobileApn + ", got type=" + upType);
}
// if we're on DUN, put our own grab on it
if (upType == ConnectivityManager.TYPE_MOBILE_DUN ||
upType == ConnectivityManager.TYPE_MOBILE_HIPRI) {
turnOnUpstreamMobileConnection(upType);
}
if (upType == ConnectivityManager.TYPE_NONE) {
boolean tryAgainLater = true;
if ((tryCell == TRY_TO_SETUP_MOBILE_CONNECTION) &&
(turnOnUpstreamMobileConnection(mPreferredUpstreamMobileApn) == true)) {
// we think mobile should be coming up - don't set a retry
tryAgainLater = false;
}
if (tryAgainLater) {
sendMessageDelayed(CMD_RETRY_UPSTREAM, UPSTREAM_SETTLE_TIME_MS);
}
} else {
LinkProperties linkProperties = null;
try {
linkProperties = mConnService.getLinkProperties(upType);
} catch (RemoteException e) { }
if (linkProperties != null) {
iface = linkProperties.getInterfaceName();
String[] dnsServers = mDefaultDnsServers;
Collection<InetAddress> dnses = linkProperties.getDnses();
if (dnses != null) {
// we currently only handle IPv4
ArrayList<InetAddress> v4Dnses =
new ArrayList<InetAddress>(dnses.size());
for (InetAddress dnsAddress : dnses) {
if (dnsAddress instanceof Inet4Address) {
v4Dnses.add(dnsAddress);
}
}
if (v4Dnses.size() > 0) {
dnsServers = NetworkUtils.makeStrings(v4Dnses);
}
}
try {
mNMService.setDnsForwarders(dnsServers);
} catch (Exception e) {
transitionTo(mSetDnsForwardersErrorState);
}
}
}
notifyTetheredOfNewUpstreamIface(iface);
}
protected void notifyTetheredOfNewUpstreamIface(String ifaceName) {
if (DBG) Log.d(TAG, "notifying tethered with iface =" + ifaceName);
mUpstreamIfaceName = ifaceName;
for (Object o : mNotifyList) {
TetherInterfaceSM sm = (TetherInterfaceSM)o;
sm.sendMessage(TetherInterfaceSM.CMD_TETHER_CONNECTION_CHANGED,
ifaceName);
}
}
}
class InitialState extends TetherMasterUtilState {
@Override
public void enter() {
}
@Override
public boolean processMessage(Message message) {
if (DBG) Log.d(TAG, "MasterInitialState.processMessage what=" + message.what);
boolean retValue = true;
switch (message.what) {
case CMD_TETHER_MODE_REQUESTED:
TetherInterfaceSM who = (TetherInterfaceSM)message.obj;
if (VDBG) Log.d(TAG, "Tether Mode requested by " + who.toString());
mNotifyList.add(who);
transitionTo(mTetherModeAliveState);
break;
case CMD_TETHER_MODE_UNREQUESTED:
who = (TetherInterfaceSM)message.obj;
if (VDBG) Log.d(TAG, "Tether Mode unrequested by " + who.toString());
int index = mNotifyList.indexOf(who);
if (index != -1) {
mNotifyList.remove(who);
}
break;
default:
retValue = false;
break;
}
return retValue;
}
}
class TetherModeAliveState extends TetherMasterUtilState {
boolean mTryCell = !WAIT_FOR_NETWORK_TO_SETTLE;
@Override
public void enter() {
turnOnMasterTetherSettings(); // may transition us out
mTryCell = !WAIT_FOR_NETWORK_TO_SETTLE; // better try something first pass
// or crazy tests cases will fail
chooseUpstreamType(mTryCell);
mTryCell = !mTryCell;
}
@Override
public void exit() {
turnOffUpstreamMobileConnection();
notifyTetheredOfNewUpstreamIface(null);
}
@Override
public boolean processMessage(Message message) {
if (DBG) Log.d(TAG, "TetherModeAliveState.processMessage what=" + message.what);
boolean retValue = true;
switch (message.what) {
case CMD_TETHER_MODE_REQUESTED:
TetherInterfaceSM who = (TetherInterfaceSM)message.obj;
mNotifyList.add(who);
who.sendMessage(TetherInterfaceSM.CMD_TETHER_CONNECTION_CHANGED,
mUpstreamIfaceName);
break;
case CMD_TETHER_MODE_UNREQUESTED:
who = (TetherInterfaceSM)message.obj;
int index = mNotifyList.indexOf(who);
if (index != -1) {
mNotifyList.remove(index);
if (mNotifyList.isEmpty()) {
turnOffMasterTetherSettings(); // transitions appropriately
}
}
break;
case CMD_UPSTREAM_CHANGED:
// need to try DUN immediately if Wifi goes down
mTryCell = !WAIT_FOR_NETWORK_TO_SETTLE;
chooseUpstreamType(mTryCell);
mTryCell = !mTryCell;
break;
case CMD_CELL_CONNECTION_RENEW:
// make sure we're still using a requested connection - may have found
// wifi or something since then.
if (mCurrentConnectionSequence == message.arg1) {
if (VDBG) {
Log.d(TAG, "renewing mobile connection - requeuing for another " +
CELL_CONNECTION_RENEW_MS + "ms");
}
turnOnUpstreamMobileConnection(mMobileApnReserved);
}
break;
case CMD_RETRY_UPSTREAM:
chooseUpstreamType(mTryCell);
mTryCell = !mTryCell;
break;
default:
retValue = false;
break;
}
return retValue;
}
}
class ErrorState extends State {
int mErrorNotification;
@Override
public boolean processMessage(Message message) {
boolean retValue = true;
switch (message.what) {
case CMD_TETHER_MODE_REQUESTED:
TetherInterfaceSM who = (TetherInterfaceSM)message.obj;
who.sendMessage(mErrorNotification);
break;
default:
retValue = false;
}
return retValue;
}
void notify(int msgType) {
mErrorNotification = msgType;
for (Object o : mNotifyList) {
TetherInterfaceSM sm = (TetherInterfaceSM)o;
sm.sendMessage(msgType);
}
}
}
class SetIpForwardingEnabledErrorState extends ErrorState {
@Override
public void enter() {
Log.e(TAG, "Error in setIpForwardingEnabled");
notify(TetherInterfaceSM.CMD_IP_FORWARDING_ENABLE_ERROR);
}
}
class SetIpForwardingDisabledErrorState extends ErrorState {
@Override
public void enter() {
Log.e(TAG, "Error in setIpForwardingDisabled");
notify(TetherInterfaceSM.CMD_IP_FORWARDING_DISABLE_ERROR);
}
}
class StartTetheringErrorState extends ErrorState {
@Override
public void enter() {
Log.e(TAG, "Error in startTethering");
notify(TetherInterfaceSM.CMD_START_TETHERING_ERROR);
try {
mNMService.setIpForwardingEnabled(false);
} catch (Exception e) {}
}
}
class StopTetheringErrorState extends ErrorState {
@Override
public void enter() {
Log.e(TAG, "Error in stopTethering");
notify(TetherInterfaceSM.CMD_STOP_TETHERING_ERROR);
try {
mNMService.setIpForwardingEnabled(false);
} catch (Exception e) {}
}
}
class SetDnsForwardersErrorState extends ErrorState {
@Override
public void enter() {
Log.e(TAG, "Error in setDnsForwarders");
notify(TetherInterfaceSM.CMD_SET_DNS_FORWARDERS_ERROR);
try {
mNMService.stopTethering();
} catch (Exception e) {}
try {
mNMService.setIpForwardingEnabled(false);
} catch (Exception e) {}
}
}
}
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (mContext.checkCallingOrSelfPermission(
android.Manifest.permission.DUMP) != PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump ConnectivityService.Tether " +
"from from pid=" + Binder.getCallingPid() + ", uid=" +
Binder.getCallingUid());
return;
}
synchronized (mPublicSync) {
pw.println("mUpstreamIfaceTypes: ");
for (Integer netType : mUpstreamIfaceTypes) {
pw.println(" " + netType);
}
pw.println();
pw.println("Tether state:");
for (Object o : mIfaces.values()) {
pw.println(" "+o.toString());
}
}
pw.println();
return;
}
}