/*
* Copyright (C) 2008 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;
import static android.net.wifi.WifiManager.WIFI_STATE_DISABLED;
import static android.net.wifi.WifiManager.WIFI_STATE_DISABLING;
import static android.net.wifi.WifiManager.WIFI_STATE_ENABLED;
import static android.net.wifi.WifiManager.WIFI_STATE_ENABLING;
import static android.net.wifi.WifiManager.WIFI_STATE_UNKNOWN;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.bluetooth.BluetoothA2dp;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.net.wifi.IWifiManager;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiNative;
import android.net.wifi.WifiStateTracker;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.SupplicantState;
import android.net.NetworkStateTracker;
import android.net.DhcpInfo;
import android.net.NetworkUtils;
import android.os.Binder;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.provider.Settings;
import android.util.Log;
import android.text.TextUtils;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import com.android.internal.app.IBatteryStats;
import android.backup.IBackupManager;
import com.android.server.am.BatteryStatsService;
/**
* WifiService handles remote WiFi operation requests by implementing
* the IWifiManager interface. It also creates a WifiMonitor to listen
* for Wifi-related events.
*
* @hide
*/
public class WifiService extends IWifiManager.Stub {
private static final String TAG = "WifiService";
private static final boolean DBG = false;
private static final Pattern scanResultPattern = Pattern.compile("\t+");
private final WifiStateTracker mWifiStateTracker;
private Context mContext;
private int mWifiState;
private AlarmManager mAlarmManager;
private PendingIntent mIdleIntent;
private static final int IDLE_REQUEST = 0;
private boolean mScreenOff;
private boolean mDeviceIdle;
private int mPluggedType;
// true if the user enabled Wifi while in airplane mode
private boolean mAirplaneModeOverwridden;
private final LockList mLocks = new LockList();
// some wifi lock statistics
private int mFullLocksAcquired;
private int mFullLocksReleased;
private int mScanLocksAcquired;
private int mScanLocksReleased;
private final List<Multicaster> mMulticasters =
new ArrayList<Multicaster>();
private int mMulticastEnabled;
private int mMulticastDisabled;
private final IBatteryStats mBatteryStats;
/**
* See {@link Settings.Gservices#WIFI_IDLE_MS}. This is the default value if a
* Settings.Gservices value is not present. This timeout value is chosen as
* the approximate point at which the battery drain caused by Wi-Fi
* being enabled but not active exceeds the battery drain caused by
* re-establishing a connection to the mobile data network.
*/
private static final long DEFAULT_IDLE_MILLIS = 15 * 60 * 1000; /* 15 minutes */
private static final String WAKELOCK_TAG = "WifiService";
/**
* The maximum amount of time to hold the wake lock after a disconnect
* caused by stopping the driver. Establishing an EDGE connection has been
* observed to take about 5 seconds under normal circumstances. This
* provides a bit of extra margin.
* <p>
* See {@link android.provider.Settings.Secure#WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS}.
* This is the default value if a Settings.Secure value is not present.
*/
private static final int DEFAULT_WAKELOCK_TIMEOUT = 8000;
// Wake lock used by driver-stop operation
private static PowerManager.WakeLock sDriverStopWakeLock;
// Wake lock used by other operations
private static PowerManager.WakeLock sWakeLock;
private static final int MESSAGE_ENABLE_WIFI = 0;
private static final int MESSAGE_DISABLE_WIFI = 1;
private static final int MESSAGE_STOP_WIFI = 2;
private static final int MESSAGE_START_WIFI = 3;
private static final int MESSAGE_RELEASE_WAKELOCK = 4;
private final WifiHandler mWifiHandler;
/*
* Cache of scan results objects (size is somewhat arbitrary)
*/
private static final int SCAN_RESULT_CACHE_SIZE = 80;
private final LinkedHashMap<String, ScanResult> mScanResultCache;
/*
* Character buffer used to parse scan results (optimization)
*/
private static final int SCAN_RESULT_BUFFER_SIZE = 512;
private boolean mNeedReconfig;
/*
* Last UID that asked to enable WIFI.
*/
private int mLastEnableUid = Process.myUid();
/**
* Number of allowed radio frequency channels in various regulatory domains.
* This list is sufficient for 802.11b/g networks (2.4GHz range).
*/
private static int[] sValidRegulatoryChannelCounts = new int[] {11, 13, 14};
private static final String ACTION_DEVICE_IDLE =
"com.android.server.WifiManager.action.DEVICE_IDLE";
WifiService(Context context, WifiStateTracker tracker) {
mContext = context;
mWifiStateTracker = tracker;
mWifiStateTracker.enableRssiPolling(true);
mBatteryStats = BatteryStatsService.getService();
mScanResultCache = new LinkedHashMap<String, ScanResult>(
SCAN_RESULT_CACHE_SIZE, 0.75f, true) {
/*
* Limit the cache size by SCAN_RESULT_CACHE_SIZE
* elements
*/
public boolean removeEldestEntry(Map.Entry eldest) {
return SCAN_RESULT_CACHE_SIZE < this.size();
}
};
HandlerThread wifiThread = new HandlerThread("WifiService");
wifiThread.start();
mWifiHandler = new WifiHandler(wifiThread.getLooper());
mWifiState = WIFI_STATE_DISABLED;
boolean wifiEnabled = getPersistedWifiEnabled();
mAlarmManager = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
Intent idleIntent = new Intent(ACTION_DEVICE_IDLE, null);
mIdleIntent = PendingIntent.getBroadcast(mContext, IDLE_REQUEST, idleIntent, 0);
PowerManager powerManager = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
sWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKELOCK_TAG);
sDriverStopWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, WAKELOCK_TAG);
mWifiStateTracker.setReleaseWakeLockCallback(
new Runnable() {
public void run() {
mWifiHandler.removeMessages(MESSAGE_RELEASE_WAKELOCK);
synchronized (sDriverStopWakeLock) {
if (sDriverStopWakeLock.isHeld()) {
sDriverStopWakeLock.release();
}
}
}
}
);
Log.i(TAG, "WifiService starting up with Wi-Fi " +
(wifiEnabled ? "enabled" : "disabled"));
mContext.registerReceiver(
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// clear our flag indicating the user has overwridden airplane mode
mAirplaneModeOverwridden = false;
updateWifiState();
}
},
new IntentFilter(Intent.ACTION_AIRPLANE_MODE_CHANGED));
setWifiEnabledBlocking(wifiEnabled, false, Process.myUid());
}
private boolean getPersistedWifiEnabled() {
final ContentResolver cr = mContext.getContentResolver();
try {
return Settings.Secure.getInt(cr, Settings.Secure.WIFI_ON) == 1;
} catch (Settings.SettingNotFoundException e) {
Settings.Secure.putInt(cr, Settings.Secure.WIFI_ON, 0);
return false;
}
}
private void persistWifiEnabled(boolean enabled) {
final ContentResolver cr = mContext.getContentResolver();
Settings.Secure.putInt(cr, Settings.Secure.WIFI_ON, enabled ? 1 : 0);
}
NetworkStateTracker getNetworkStateTracker() {
return mWifiStateTracker;
}
/**
* see {@link android.net.wifi.WifiManager#pingSupplicant()}
* @return {@code true} if the operation succeeds
*/
public boolean pingSupplicant() {
enforceChangePermission();
synchronized (mWifiStateTracker) {
return WifiNative.pingCommand();
}
}
/**
* see {@link android.net.wifi.WifiManager#startScan()}
* @return {@code true} if the operation succeeds
*/
public boolean startScan(boolean forceActive) {
enforceChangePermission();
synchronized (mWifiStateTracker) {
switch (mWifiStateTracker.getSupplicantState()) {
case DISCONNECTED:
case INACTIVE:
case SCANNING:
case DORMANT:
break;
default:
WifiNative.setScanResultHandlingCommand(
WifiStateTracker.SUPPL_SCAN_HANDLING_LIST_ONLY);
break;
}
return WifiNative.scanCommand(forceActive);
}
}
/**
* see {@link android.net.wifi.WifiManager#setWifiEnabled(boolean)}
* @param enable {@code true} to enable, {@code false} to disable.
* @return {@code true} if the enable/disable operation was
* started or is already in the queue.
*/
public boolean setWifiEnabled(boolean enable) {
enforceChangePermission();
if (mWifiHandler == null) return false;
synchronized (mWifiHandler) {
// caller may not have WAKE_LOCK permission - it's not required here
long ident = Binder.clearCallingIdentity();
sWakeLock.acquire();
Binder.restoreCallingIdentity(ident);
mLastEnableUid = Binder.getCallingUid();
// set a flag if the user is enabling Wifi while in airplane mode
mAirplaneModeOverwridden = (enable && isAirplaneModeOn() && isAirplaneToggleable());
sendEnableMessage(enable, true, Binder.getCallingUid());
}
return true;
}
/**
* Enables/disables Wi-Fi synchronously.
* @param enable {@code true} to turn Wi-Fi on, {@code false} to turn it off.
* @param persist {@code true} if the setting should be persisted.
* @param uid The UID of the process making the request.
* @return {@code true} if the operation succeeds (or if the existing state
* is the same as the requested state)
*/
private boolean setWifiEnabledBlocking(boolean enable, boolean persist, int uid) {
final int eventualWifiState = enable ? WIFI_STATE_ENABLED : WIFI_STATE_DISABLED;
if (mWifiState == eventualWifiState) {
return true;
}
if (enable && isAirplaneModeOn() && !mAirplaneModeOverwridden) {
return false;
}
setWifiEnabledState(enable ? WIFI_STATE_ENABLING : WIFI_STATE_DISABLING, uid);
if (enable) {
if (!WifiNative.loadDriver()) {
Log.e(TAG, "Failed to load Wi-Fi driver.");
setWifiEnabledState(WIFI_STATE_UNKNOWN, uid);
return false;
}
if (!WifiNative.startSupplicant()) {
WifiNative.unloadDriver();
Log.e(TAG, "Failed to start supplicant daemon.");
setWifiEnabledState(WIFI_STATE_UNKNOWN, uid);
return false;
}
registerForBroadcasts();
mWifiStateTracker.startEventLoop();
} else {
mContext.unregisterReceiver(mReceiver);
// Remove notification (it will no-op if it isn't visible)
mWifiStateTracker.setNotificationVisible(false, 0, false, 0);
boolean failedToStopSupplicantOrUnloadDriver = false;
if (!WifiNative.stopSupplicant()) {
Log.e(TAG, "Failed to stop supplicant daemon.");
setWifiEnabledState(WIFI_STATE_UNKNOWN, uid);
failedToStopSupplicantOrUnloadDriver = true;
}
// We must reset the interface before we unload the driver
mWifiStateTracker.resetInterface(false);
if (!WifiNative.unloadDriver()) {
Log.e(TAG, "Failed to unload Wi-Fi driver.");
if (!failedToStopSupplicantOrUnloadDriver) {
setWifiEnabledState(WIFI_STATE_UNKNOWN, uid);
failedToStopSupplicantOrUnloadDriver = true;
}
}
if (failedToStopSupplicantOrUnloadDriver) {
return false;
}
}
// Success!
if (persist) {
persistWifiEnabled(enable);
}
setWifiEnabledState(eventualWifiState, uid);
return true;
}
private void setWifiEnabledState(int wifiState, int uid) {
final int previousWifiState = mWifiState;
long ident = Binder.clearCallingIdentity();
try {
if (wifiState == WIFI_STATE_ENABLED) {
mBatteryStats.noteWifiOn(uid);
} else if (wifiState == WIFI_STATE_DISABLED) {
mBatteryStats.noteWifiOff(uid);
}
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
// Update state
mWifiState = wifiState;
// Broadcast
final Intent intent = new Intent(WifiManager.WIFI_STATE_CHANGED_ACTION);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
intent.putExtra(WifiManager.EXTRA_WIFI_STATE, wifiState);
intent.putExtra(WifiManager.EXTRA_PREVIOUS_WIFI_STATE, previousWifiState);
mContext.sendStickyBroadcast(intent);
}
private void enforceAccessPermission() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.ACCESS_WIFI_STATE,
"WifiService");
}
private void enforceChangePermission() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.CHANGE_WIFI_STATE,
"WifiService");
}
private void enforceMulticastChangePermission() {
mContext.enforceCallingOrSelfPermission(
android.Manifest.permission.CHANGE_WIFI_MULTICAST_STATE,
"WifiService");
}
/**
* see {@link WifiManager#getWifiState()}
* @return One of {@link WifiManager#WIFI_STATE_DISABLED},
* {@link WifiManager#WIFI_STATE_DISABLING},
* {@link WifiManager#WIFI_STATE_ENABLED},
* {@link WifiManager#WIFI_STATE_ENABLING},
* {@link WifiManager#WIFI_STATE_UNKNOWN}
*/
public int getWifiEnabledState() {
enforceAccessPermission();
return mWifiState;
}
/**
* see {@link android.net.wifi.WifiManager#disconnect()}
* @return {@code true} if the operation succeeds
*/
public boolean disconnect() {
enforceChangePermission();
synchronized (mWifiStateTracker) {
return WifiNative.disconnectCommand();
}
}
/**
* see {@link android.net.wifi.WifiManager#reconnect()}
* @return {@code true} if the operation succeeds
*/
public boolean reconnect() {
enforceChangePermission();
synchronized (mWifiStateTracker) {
return WifiNative.reconnectCommand();
}
}
/**
* see {@link android.net.wifi.WifiManager#reassociate()}
* @return {@code true} if the operation succeeds
*/
public boolean reassociate() {
enforceChangePermission();
synchronized (mWifiStateTracker) {
return WifiNative.reassociateCommand();
}
}
/**
* see {@link android.net.wifi.WifiManager#getConfiguredNetworks()}
* @return the list of configured networks
*/
public List<WifiConfiguration> getConfiguredNetworks() {
enforceAccessPermission();
String listStr;
/*
* We don't cache the list, because we want to allow
* for the possibility that the configuration file
* has been modified through some external means,
* such as the wpa_cli command line program.
*/
synchronized (mWifiStateTracker) {
listStr = WifiNative.listNetworksCommand();
}
List<WifiConfiguration> networks =
new ArrayList<WifiConfiguration>();
if (listStr == null)
return networks;
String[] lines = listStr.split("\n");
// Skip the first line, which is a header
for (int i = 1; i < lines.length; i++) {
String[] result = lines[i].split("\t");
// network-id | ssid | bssid | flags
WifiConfiguration config = new WifiConfiguration();
try {
config.networkId = Integer.parseInt(result[0]);
} catch(NumberFormatException e) {
continue;
}
if (result.length > 3) {
if (result[3].indexOf("[CURRENT]") != -1)
config.status = WifiConfiguration.Status.CURRENT;
else if (result[3].indexOf("[DISABLED]") != -1)
config.status = WifiConfiguration.Status.DISABLED;
else
config.status = WifiConfiguration.Status.ENABLED;
} else
config.status = WifiConfiguration.Status.ENABLED;
synchronized (mWifiStateTracker) {
readNetworkVariables(config);
}
networks.add(config);
}
return networks;
}
/**
* Read the variables from the supplicant daemon that are needed to
* fill in the WifiConfiguration object.
* <p/>
* The caller must hold the synchronization monitor.
* @param config the {@link WifiConfiguration} object to be filled in.
*/
private static void readNetworkVariables(WifiConfiguration config) {
int netId = config.networkId;
if (netId < 0)
return;
/*
* TODO: maybe should have a native method that takes an array of
* variable names and returns an array of values. But we'd still
* be doing a round trip to the supplicant daemon for each variable.
*/
String value;
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.ssidVarName);
if (!TextUtils.isEmpty(value)) {
config.SSID = value;
} else {
config.SSID = null;
}
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.bssidVarName);
if (!TextUtils.isEmpty(value)) {
config.BSSID = value;
} else {
config.BSSID = null;
}
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.priorityVarName);
config.priority = -1;
if (!TextUtils.isEmpty(value)) {
try {
config.priority = Integer.parseInt(value);
} catch (NumberFormatException ignore) {
}
}
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.hiddenSSIDVarName);
config.hiddenSSID = false;
if (!TextUtils.isEmpty(value)) {
try {
config.hiddenSSID = Integer.parseInt(value) != 0;
} catch (NumberFormatException ignore) {
}
}
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.wepTxKeyIdxVarName);
config.wepTxKeyIndex = -1;
if (!TextUtils.isEmpty(value)) {
try {
config.wepTxKeyIndex = Integer.parseInt(value);
} catch (NumberFormatException ignore) {
}
}
/*
* Get up to 4 WEP keys. Note that the actual keys are not passed back,
* just a "*" if the key is set, or the null string otherwise.
*/
for (int i = 0; i < 4; i++) {
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.wepKeyVarNames[i]);
if (!TextUtils.isEmpty(value)) {
config.wepKeys[i] = value;
} else {
config.wepKeys[i] = null;
}
}
/*
* Get the private shared key. Note that the actual keys are not passed back,
* just a "*" if the key is set, or the null string otherwise.
*/
value = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.pskVarName);
if (!TextUtils.isEmpty(value)) {
config.preSharedKey = value;
} else {
config.preSharedKey = null;
}
value = WifiNative.getNetworkVariableCommand(config.networkId,
WifiConfiguration.Protocol.varName);
if (!TextUtils.isEmpty(value)) {
String vals[] = value.split(" ");
for (String val : vals) {
int index =
lookupString(val, WifiConfiguration.Protocol.strings);
if (0 <= index) {
config.allowedProtocols.set(index);
}
}
}
value = WifiNative.getNetworkVariableCommand(config.networkId,
WifiConfiguration.KeyMgmt.varName);
if (!TextUtils.isEmpty(value)) {
String vals[] = value.split(" ");
for (String val : vals) {
int index =
lookupString(val, WifiConfiguration.KeyMgmt.strings);
if (0 <= index) {
config.allowedKeyManagement.set(index);
}
}
}
value = WifiNative.getNetworkVariableCommand(config.networkId,
WifiConfiguration.AuthAlgorithm.varName);
if (!TextUtils.isEmpty(value)) {
String vals[] = value.split(" ");
for (String val : vals) {
int index =
lookupString(val, WifiConfiguration.AuthAlgorithm.strings);
if (0 <= index) {
config.allowedAuthAlgorithms.set(index);
}
}
}
value = WifiNative.getNetworkVariableCommand(config.networkId,
WifiConfiguration.PairwiseCipher.varName);
if (!TextUtils.isEmpty(value)) {
String vals[] = value.split(" ");
for (String val : vals) {
int index =
lookupString(val, WifiConfiguration.PairwiseCipher.strings);
if (0 <= index) {
config.allowedPairwiseCiphers.set(index);
}
}
}
value = WifiNative.getNetworkVariableCommand(config.networkId,
WifiConfiguration.GroupCipher.varName);
if (!TextUtils.isEmpty(value)) {
String vals[] = value.split(" ");
for (String val : vals) {
int index =
lookupString(val, WifiConfiguration.GroupCipher.strings);
if (0 <= index) {
config.allowedGroupCiphers.set(index);
}
}
}
for (WifiConfiguration.EnterpriseField field :
config.enterpriseFields) {
value = WifiNative.getNetworkVariableCommand(netId,
field.varName());
if (!TextUtils.isEmpty(value)) {
field.setValue(value);
}
}
}
/**
* see {@link android.net.wifi.WifiManager#addOrUpdateNetwork(WifiConfiguration)}
* @return the supplicant-assigned identifier for the new or updated
* network if the operation succeeds, or {@code -1} if it fails
*/
public synchronized int addOrUpdateNetwork(WifiConfiguration config) {
enforceChangePermission();
/*
* If the supplied networkId is -1, we create a new empty
* network configuration. Otherwise, the networkId should
* refer to an existing configuration.
*/
int netId = config.networkId;
boolean newNetwork = netId == -1;
boolean doReconfig;
int currentPriority;
// networkId of -1 means we want to create a new network
if (newNetwork) {
netId = WifiNative.addNetworkCommand();
if (netId < 0) {
if (DBG) {
Log.d(TAG, "Failed to add a network!");
}
return -1;
}
doReconfig = true;
} else {
String priorityVal = WifiNative.getNetworkVariableCommand(netId, WifiConfiguration.priorityVarName);
currentPriority = -1;
if (!TextUtils.isEmpty(priorityVal)) {
try {
currentPriority = Integer.parseInt(priorityVal);
} catch (NumberFormatException ignore) {
}
}
doReconfig = currentPriority != config.priority;
}
mNeedReconfig = mNeedReconfig || doReconfig;
setVariables: {
/*
* Note that if a networkId for a non-existent network
* was supplied, then the first setNetworkVariableCommand()
* will fail, so we don't bother to make a separate check
* for the validity of the ID up front.
*/
if (config.SSID != null &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.ssidVarName,
config.SSID)) {
if (DBG) {
Log.d(TAG, "failed to set SSID: "+config.SSID);
}
break setVariables;
}
if (config.BSSID != null &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.bssidVarName,
config.BSSID)) {
if (DBG) {
Log.d(TAG, "failed to set BSSID: "+config.BSSID);
}
break setVariables;
}
String allowedKeyManagementString =
makeString(config.allowedKeyManagement, WifiConfiguration.KeyMgmt.strings);
if (config.allowedKeyManagement.cardinality() != 0 &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.KeyMgmt.varName,
allowedKeyManagementString)) {
if (DBG) {
Log.d(TAG, "failed to set key_mgmt: "+
allowedKeyManagementString);
}
break setVariables;
}
String allowedProtocolsString =
makeString(config.allowedProtocols, WifiConfiguration.Protocol.strings);
if (config.allowedProtocols.cardinality() != 0 &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.Protocol.varName,
allowedProtocolsString)) {
if (DBG) {
Log.d(TAG, "failed to set proto: "+
allowedProtocolsString);
}
break setVariables;
}
String allowedAuthAlgorithmsString =
makeString(config.allowedAuthAlgorithms, WifiConfiguration.AuthAlgorithm.strings);
if (config.allowedAuthAlgorithms.cardinality() != 0 &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.AuthAlgorithm.varName,
allowedAuthAlgorithmsString)) {
if (DBG) {
Log.d(TAG, "failed to set auth_alg: "+
allowedAuthAlgorithmsString);
}
break setVariables;
}
String allowedPairwiseCiphersString =
makeString(config.allowedPairwiseCiphers, WifiConfiguration.PairwiseCipher.strings);
if (config.allowedPairwiseCiphers.cardinality() != 0 &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.PairwiseCipher.varName,
allowedPairwiseCiphersString)) {
if (DBG) {
Log.d(TAG, "failed to set pairwise: "+
allowedPairwiseCiphersString);
}
break setVariables;
}
String allowedGroupCiphersString =
makeString(config.allowedGroupCiphers, WifiConfiguration.GroupCipher.strings);
if (config.allowedGroupCiphers.cardinality() != 0 &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.GroupCipher.varName,
allowedGroupCiphersString)) {
if (DBG) {
Log.d(TAG, "failed to set group: "+
allowedGroupCiphersString);
}
break setVariables;
}
// Prevent client screw-up by passing in a WifiConfiguration we gave it
// by preventing "*" as a key.
if (config.preSharedKey != null && !config.preSharedKey.equals("*") &&
!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.pskVarName,
config.preSharedKey)) {
if (DBG) {
Log.d(TAG, "failed to set psk: "+config.preSharedKey);
}
break setVariables;
}
boolean hasSetKey = false;
if (config.wepKeys != null) {
for (int i = 0; i < config.wepKeys.length; i++) {
// Prevent client screw-up by passing in a WifiConfiguration we gave it
// by preventing "*" as a key.
if (config.wepKeys[i] != null && !config.wepKeys[i].equals("*")) {
if (!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.wepKeyVarNames[i],
config.wepKeys[i])) {
if (DBG) {
Log.d(TAG,
"failed to set wep_key"+i+": " +
config.wepKeys[i]);
}
break setVariables;
}
hasSetKey = true;
}
}
}
if (hasSetKey) {
if (!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.wepTxKeyIdxVarName,
Integer.toString(config.wepTxKeyIndex))) {
if (DBG) {
Log.d(TAG,
"failed to set wep_tx_keyidx: "+
config.wepTxKeyIndex);
}
break setVariables;
}
}
if (!WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.priorityVarName,
Integer.toString(config.priority))) {
if (DBG) {
Log.d(TAG, config.SSID + ": failed to set priority: "
+config.priority);
}
break setVariables;
}
if (config.hiddenSSID && !WifiNative.setNetworkVariableCommand(
netId,
WifiConfiguration.hiddenSSIDVarName,
Integer.toString(config.hiddenSSID ? 1 : 0))) {
if (DBG) {
Log.d(TAG, config.SSID + ": failed to set hiddenSSID: "+
config.hiddenSSID);
}
break setVariables;
}
for (WifiConfiguration.EnterpriseField field
: config.enterpriseFields) {
String varName = field.varName();
String value = field.value();
if ((value != null) && !WifiNative.setNetworkVariableCommand(
netId,
varName,
value)) {
if (DBG) {
Log.d(TAG, config.SSID + ": failed to set " + varName +
": " + value);
}
break setVariables;
}
}
return netId;
}
/*
* For an update, if one of the setNetworkVariable operations fails,
* we might want to roll back all the changes already made. But the
* chances are that if anything is going to go wrong, it'll happen
* the first time we try to set one of the variables.
*/
if (newNetwork) {
removeNetwork(netId);
if (DBG) {
Log.d(TAG,
"Failed to set a network variable, removed network: "
+ netId);
}
}
return -1;
}
private static String makeString(BitSet set, String[] strings) {
StringBuffer buf = new StringBuffer();
int nextSetBit = -1;
/* Make sure all set bits are in [0, strings.length) to avoid
* going out of bounds on strings. (Shouldn't happen, but...) */
set = set.get(0, strings.length);
while ((nextSetBit = set.nextSetBit(nextSetBit + 1)) != -1) {
buf.append(strings[nextSetBit].replace('_', '-')).append(' ');
}
// remove trailing space
if (set.cardinality() > 0) {
buf.setLength(buf.length() - 1);
}
return buf.toString();
}
private static int lookupString(String string, String[] strings) {
int size = strings.length;
string = string.replace('-', '_');
for (int i = 0; i < size; i++)
if (string.equals(strings[i]))
return i;
if (DBG) {
// if we ever get here, we should probably add the
// value to WifiConfiguration to reflect that it's
// supported by the WPA supplicant
Log.w(TAG, "Failed to look-up a string: " + string);
}
return -1;
}
/**
* See {@link android.net.wifi.WifiManager#removeNetwork(int)}
* @param netId the integer that identifies the network configuration
* to the supplicant
* @return {@code true} if the operation succeeded
*/
public boolean removeNetwork(int netId) {
enforceChangePermission();
return mWifiStateTracker.removeNetwork(netId);
}
/**
* See {@link android.net.wifi.WifiManager#enableNetwork(int, boolean)}
* @param netId the integer that identifies the network configuration
* to the supplicant
* @param disableOthers if true, disable all other networks.
* @return {@code true} if the operation succeeded
*/
public boolean enableNetwork(int netId, boolean disableOthers) {
enforceChangePermission();
synchronized (mWifiStateTracker) {
String ifname = mWifiStateTracker.getInterfaceName();
NetworkUtils.enableInterface(ifname);
boolean result = WifiNative.enableNetworkCommand(netId, disableOthers);
if (!result) {
NetworkUtils.disableInterface(ifname);
}
return result;
}
}
/**
* See {@link android.net.wifi.WifiManager#disableNetwork(int)}
* @param netId the integer that identifies the network configuration
* to the supplicant
* @return {@code true} if the operation succeeded
*/
public boolean disableNetwork(int netId) {
enforceChangePermission();
synchronized (mWifiStateTracker) {
return WifiNative.disableNetworkCommand(netId);
}
}
/**
* See {@link android.net.wifi.WifiManager#getConnectionInfo()}
* @return the Wi-Fi information, contained in {@link WifiInfo}.
*/
public WifiInfo getConnectionInfo() {
enforceAccessPermission();
/*
* Make sure we have the latest information, by sending
* a status request to the supplicant.
*/
return mWifiStateTracker.requestConnectionInfo();
}
/**
* Return the results of the most recent access point scan, in the form of
* a list of {@link ScanResult} objects.
* @return the list of results
*/
public List<ScanResult> getScanResults() {
enforceAccessPermission();
String reply;
synchronized (mWifiStateTracker) {
reply = WifiNative.scanResultsCommand();
}
if (reply == null) {
return null;
}
List<ScanResult> scanList = new ArrayList<ScanResult>();
int lineCount = 0;
int replyLen = reply.length();
// Parse the result string, keeping in mind that the last line does
// not end with a newline.
for (int lineBeg = 0, lineEnd = 0; lineEnd <= replyLen; ++lineEnd) {
if (lineEnd == replyLen || reply.charAt(lineEnd) == '\n') {
++lineCount;
/*
* Skip the first line, which is a header
*/
if (lineCount == 1) {
lineBeg = lineEnd + 1;
continue;
}
if (lineEnd > lineBeg) {
String line = reply.substring(lineBeg, lineEnd);
ScanResult scanResult = parseScanResult(line);
if (scanResult != null) {
scanList.add(scanResult);
} else if (DBG) {
Log.w(TAG, "misformatted scan result for: " + line);
}
}
lineBeg = lineEnd + 1;
}
}
mWifiStateTracker.setScanResultsList(scanList);
return scanList;
}
/**
* Parse the scan result line passed to us by wpa_supplicant (helper).
* @param line the line to parse
* @return the {@link ScanResult} object
*/
private ScanResult parseScanResult(String line) {
ScanResult scanResult = null;
if (line != null) {
/*
* Cache implementation (LinkedHashMap) is not synchronized, thus,
* must synchronized here!
*/
synchronized (mScanResultCache) {
String[] result = scanResultPattern.split(line);
if (3 <= result.length && result.length <= 5) {
String bssid = result[0];
// bssid | frequency | level | flags | ssid
int frequency;
int level;
try {
frequency = Integer.parseInt(result[1]);
level = Integer.parseInt(result[2]);
/* some implementations avoid negative values by adding 256
* so we need to adjust for that here.
*/
if (level > 0) level -= 256;
} catch (NumberFormatException e) {
frequency = 0;
level = 0;
}
/*
* The formatting of the results returned by
* wpa_supplicant is intended to make the fields
* line up nicely when printed,
* not to make them easy to parse. So we have to
* apply some heuristics to figure out which field
* is the SSID and which field is the flags.
*/
String ssid;
String flags;
if (result.length == 4) {
if (result[3].charAt(0) == '[') {
flags = result[3];
ssid = "";
} else {
flags = "";
ssid = result[3];
}
} else if (result.length == 5) {
flags = result[3];
ssid = result[4];
} else {
// Here, we must have 3 fields: no flags and ssid
// set
flags = "";
ssid = "";
}
// bssid + ssid is the hash key
String key = bssid + ssid;
scanResult = mScanResultCache.get(key);
if (scanResult != null) {
scanResult.level = level;
scanResult.SSID = ssid;
scanResult.capabilities = flags;
scanResult.frequency = frequency;
} else {
// Do not add scan results that have no SSID set
if (0 < ssid.trim().length()) {
scanResult =
new ScanResult(
ssid, bssid, flags, level, frequency);
mScanResultCache.put(key, scanResult);
}
}
} else {
Log.w(TAG, "Misformatted scan result text with " +
result.length + " fields: " + line);
}
}
}
return scanResult;
}
/**
* Parse the "flags" field passed back in a scan result by wpa_supplicant,
* and construct a {@code WifiConfiguration} that describes the encryption,
* key management, and authenticaion capabilities of the access point.
* @param flags the string returned by wpa_supplicant
* @return the {@link WifiConfiguration} object, filled in
*/
WifiConfiguration parseScanFlags(String flags) {
WifiConfiguration config = new WifiConfiguration();
if (flags.length() == 0) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
}
// ... to be implemented
return config;
}
/**
* Tell the supplicant to persist the current list of configured networks.
* @return {@code true} if the operation succeeded
*/
public boolean saveConfiguration() {
boolean result;
enforceChangePermission();
synchronized (mWifiStateTracker) {
result = WifiNative.saveConfigCommand();
if (result && mNeedReconfig) {
mNeedReconfig = false;
result = WifiNative.reloadConfigCommand();
if (result) {
Intent intent = new Intent(WifiManager.NETWORK_IDS_CHANGED_ACTION);
mContext.sendBroadcast(intent);
}
}
}
// Inform the backup manager about a data change
IBackupManager ibm = IBackupManager.Stub.asInterface(
ServiceManager.getService(Context.BACKUP_SERVICE));
if (ibm != null) {
try {
ibm.dataChanged("com.android.providers.settings");
} catch (Exception e) {
// Try again later
}
}
return result;
}
/**
* Set the number of radio frequency channels that are allowed to be used
* in the current regulatory domain. This method should be used only
* if the correct number of channels cannot be determined automatically
* for some reason. If the operation is successful, the new value may be
* persisted as a Secure setting.
* @param numChannels the number of allowed channels. Must be greater than 0
* and less than or equal to 16.
* @param persist {@code true} if the setting should be remembered.
* @return {@code true} if the operation succeeds, {@code false} otherwise, e.g.,
* {@code numChannels} is outside the valid range.
*/
public boolean setNumAllowedChannels(int numChannels, boolean persist) {
Log.i(TAG, "WifiService trying to setNumAllowed to "+numChannels+
" with persist set to "+persist);
enforceChangePermission();
/*
* Validate the argument. We'd like to let the Wi-Fi driver do this,
* but if Wi-Fi isn't currently enabled, that's not possible, and
* we want to persist the setting anyway,so that it will take
* effect when Wi-Fi does become enabled.
*/
boolean found = false;
for (int validChan : sValidRegulatoryChannelCounts) {
if (validChan == numChannels) {
found = true;
break;
}
}
if (!found) {
return false;
}
if (persist) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.WIFI_NUM_ALLOWED_CHANNELS,
numChannels);
}
mWifiStateTracker.setNumAllowedChannels(numChannels);
return true;
}
/**
* Return the number of frequency channels that are allowed
* to be used in the current regulatory domain.
* @return the number of allowed channels, or {@code -1} if an error occurs
*/
public int getNumAllowedChannels() {
int numChannels;
enforceAccessPermission();
synchronized (mWifiStateTracker) {
/*
* If we can't get the value from the driver (e.g., because
* Wi-Fi is not currently enabled), get the value from
* Settings.
*/
numChannels = WifiNative.getNumAllowedChannelsCommand();
if (numChannels < 0) {
numChannels = Settings.Secure.getInt(mContext.getContentResolver(),
Settings.Secure.WIFI_NUM_ALLOWED_CHANNELS,
-1);
}
}
return numChannels;
}
/**
* Return the list of valid values for the number of allowed radio channels
* for various regulatory domains.
* @return the list of channel counts
*/
public int[] getValidChannelCounts() {
enforceAccessPermission();
return sValidRegulatoryChannelCounts;
}
/**
* Return the DHCP-assigned addresses from the last successful DHCP request,
* if any.
* @return the DHCP information
*/
public DhcpInfo getDhcpInfo() {
enforceAccessPermission();
return mWifiStateTracker.getDhcpInfo();
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
long idleMillis = Settings.Gservices.getLong(mContext.getContentResolver(),
Settings.Gservices.WIFI_IDLE_MS, DEFAULT_IDLE_MILLIS);
int stayAwakeConditions =
Settings.System.getInt(mContext.getContentResolver(),
Settings.System.STAY_ON_WHILE_PLUGGED_IN, 0);
if (action.equals(Intent.ACTION_SCREEN_ON)) {
Log.d(TAG, "ACTION_SCREEN_ON");
mAlarmManager.cancel(mIdleIntent);
mDeviceIdle = false;
mScreenOff = false;
mWifiStateTracker.enableRssiPolling(true);
} else if (action.equals(Intent.ACTION_SCREEN_OFF)) {
Log.d(TAG, "ACTION_SCREEN_OFF");
mScreenOff = true;
mWifiStateTracker.enableRssiPolling(false);
/*
* Set a timer to put Wi-Fi to sleep, but only if the screen is off
* AND the "stay on while plugged in" setting doesn't match the
* current power conditions (i.e, not plugged in, plugged in to USB,
* or plugged in to AC).
*/
if (!shouldWifiStayAwake(stayAwakeConditions, mPluggedType)) {
WifiInfo info = mWifiStateTracker.requestConnectionInfo();
if (info.getSupplicantState() != SupplicantState.COMPLETED) {
// we used to go to sleep immediately, but this caused some race conditions
// we don't have time to track down for this release. Delay instead, but not
// as long as we would if connected (below)
// TODO - fix the race conditions and switch back to the immediate turn-off
long triggerTime = System.currentTimeMillis() + (2*60*1000); // 2 min
Log.d(TAG, "setting ACTION_DEVICE_IDLE timer for 120,000 ms");
mAlarmManager.set(AlarmManager.RTC_WAKEUP, triggerTime, mIdleIntent);
// // do not keep Wifi awake when screen is off if Wifi is not associated
// mDeviceIdle = true;
// updateWifiState();
} else {
long triggerTime = System.currentTimeMillis() + idleMillis;
Log.d(TAG, "setting ACTION_DEVICE_IDLE timer for " + idleMillis + "ms");
mAlarmManager.set(AlarmManager.RTC_WAKEUP, triggerTime, mIdleIntent);
}
}
/* we can return now -- there's nothing to do until we get the idle intent back */
return;
} else if (action.equals(ACTION_DEVICE_IDLE)) {
Log.d(TAG, "got ACTION_DEVICE_IDLE");
mDeviceIdle = true;
} else if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
/*
* Set a timer to put Wi-Fi to sleep, but only if the screen is off
* AND we are transitioning from a state in which the device was supposed
* to stay awake to a state in which it is not supposed to stay awake.
* If "stay awake" state is not changing, we do nothing, to avoid resetting
* the already-set timer.
*/
int pluggedType = intent.getIntExtra("plugged", 0);
Log.d(TAG, "ACTION_BATTERY_CHANGED pluggedType: " + pluggedType);
if (mScreenOff && shouldWifiStayAwake(stayAwakeConditions, mPluggedType) &&
!shouldWifiStayAwake(stayAwakeConditions, pluggedType)) {
long triggerTime = System.currentTimeMillis() + idleMillis;
Log.d(TAG, "setting ACTION_DEVICE_IDLE timer for " + idleMillis + "ms");
mAlarmManager.set(AlarmManager.RTC_WAKEUP, triggerTime, mIdleIntent);
mPluggedType = pluggedType;
return;
}
mPluggedType = pluggedType;
} else if (action.equals(BluetoothA2dp.ACTION_SINK_STATE_CHANGED)) {
boolean isBluetoothPlaying =
intent.getIntExtra(
BluetoothA2dp.EXTRA_SINK_STATE,
BluetoothA2dp.STATE_DISCONNECTED) == BluetoothA2dp.STATE_PLAYING;
mWifiStateTracker.setBluetoothScanMode(isBluetoothPlaying);
} else {
return;
}
updateWifiState();
}
/**
* Determines whether the Wi-Fi chipset should stay awake or be put to
* sleep. Looks at the setting for the sleep policy and the current
* conditions.
*
* @see #shouldDeviceStayAwake(int, int)
*/
private boolean shouldWifiStayAwake(int stayAwakeConditions, int pluggedType) {
int wifiSleepPolicy = Settings.System.getInt(mContext.getContentResolver(),
Settings.System.WIFI_SLEEP_POLICY, Settings.System.WIFI_SLEEP_POLICY_DEFAULT);
if (wifiSleepPolicy == Settings.System.WIFI_SLEEP_POLICY_NEVER) {
// Never sleep
return true;
} else if ((wifiSleepPolicy == Settings.System.WIFI_SLEEP_POLICY_NEVER_WHILE_PLUGGED) &&
(pluggedType != 0)) {
// Never sleep while plugged, and we're plugged
return true;
} else {
// Default
return shouldDeviceStayAwake(stayAwakeConditions, pluggedType);
}
}
/**
* Determine whether the bit value corresponding to {@code pluggedType} is set in
* the bit string {@code stayAwakeConditions}. Because a {@code pluggedType} value
* of {@code 0} isn't really a plugged type, but rather an indication that the
* device isn't plugged in at all, there is no bit value corresponding to a
* {@code pluggedType} value of {@code 0}. That is why we shift by
* {@code pluggedType — 1} instead of by {@code pluggedType}.
* @param stayAwakeConditions a bit string specifying which "plugged types" should
* keep the device (and hence Wi-Fi) awake.
* @param pluggedType the type of plug (USB, AC, or none) for which the check is
* being made
* @return {@code true} if {@code pluggedType} indicates that the device is
* supposed to stay awake, {@code false} otherwise.
*/
private boolean shouldDeviceStayAwake(int stayAwakeConditions, int pluggedType) {
return (stayAwakeConditions & pluggedType) != 0;
}
};
private void sendEnableMessage(boolean enable, boolean persist, int uid) {
Message msg = Message.obtain(mWifiHandler,
(enable ? MESSAGE_ENABLE_WIFI : MESSAGE_DISABLE_WIFI),
(persist ? 1 : 0), uid);
msg.sendToTarget();
}
private void sendStartMessage(boolean scanOnlyMode) {
Message.obtain(mWifiHandler, MESSAGE_START_WIFI, scanOnlyMode ? 1 : 0, 0).sendToTarget();
}
private void updateWifiState() {
boolean wifiEnabled = getPersistedWifiEnabled();
boolean airplaneMode = isAirplaneModeOn() && !mAirplaneModeOverwridden;
boolean lockHeld = mLocks.hasLocks();
int strongestLockMode;
boolean wifiShouldBeEnabled = wifiEnabled && !airplaneMode;
boolean wifiShouldBeStarted = !mDeviceIdle || lockHeld;
if (mDeviceIdle && lockHeld) {
strongestLockMode = mLocks.getStrongestLockMode();
} else {
strongestLockMode = WifiManager.WIFI_MODE_FULL;
}
synchronized (mWifiHandler) {
if (mWifiState == WIFI_STATE_ENABLING && !airplaneMode) {
return;
}
if (wifiShouldBeEnabled) {
if (wifiShouldBeStarted) {
sWakeLock.acquire();
sendEnableMessage(true, false, mLastEnableUid);
sWakeLock.acquire();
sendStartMessage(strongestLockMode == WifiManager.WIFI_MODE_SCAN_ONLY);
} else {
int wakeLockTimeout =
Settings.Secure.getInt(
mContext.getContentResolver(),
Settings.Secure.WIFI_MOBILE_DATA_TRANSITION_WAKELOCK_TIMEOUT_MS,
DEFAULT_WAKELOCK_TIMEOUT);
/*
* The following wakelock is held in order to ensure
* that the connectivity manager has time to fail over
* to the mobile data network. The connectivity manager
* releases it once mobile data connectivity has been
* established. If connectivity cannot be established,
* the wakelock is released after wakeLockTimeout
* milliseconds have elapsed.
*/
sDriverStopWakeLock.acquire();
mWifiHandler.sendEmptyMessage(MESSAGE_STOP_WIFI);
mWifiHandler.sendEmptyMessageDelayed(MESSAGE_RELEASE_WAKELOCK, wakeLockTimeout);
}
} else {
sWakeLock.acquire();
sendEnableMessage(false, false, mLastEnableUid);
}
}
}
private void registerForBroadcasts() {
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_SCREEN_ON);
intentFilter.addAction(Intent.ACTION_SCREEN_OFF);
intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
intentFilter.addAction(ACTION_DEVICE_IDLE);
intentFilter.addAction(BluetoothA2dp.ACTION_SINK_STATE_CHANGED);
mContext.registerReceiver(mReceiver, intentFilter);
}
private boolean isAirplaneSensitive() {
String airplaneModeRadios = Settings.System.getString(mContext.getContentResolver(),
Settings.System.AIRPLANE_MODE_RADIOS);
return airplaneModeRadios == null
|| airplaneModeRadios.contains(Settings.System.RADIO_WIFI);
}
private boolean isAirplaneToggleable() {
String toggleableRadios = Settings.System.getString(mContext.getContentResolver(),
Settings.System.AIRPLANE_MODE_TOGGLEABLE_RADIOS);
return toggleableRadios != null
&& toggleableRadios.contains(Settings.System.RADIO_WIFI);
}
/**
* Returns true if Wi-Fi is sensitive to airplane mode, and airplane mode is
* currently on.
* @return {@code true} if airplane mode is on.
*/
private boolean isAirplaneModeOn() {
return isAirplaneSensitive() && Settings.System.getInt(mContext.getContentResolver(),
Settings.System.AIRPLANE_MODE_ON, 0) == 1;
}
/**
* Handler that allows posting to the WifiThread.
*/
private class WifiHandler extends Handler {
public WifiHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_ENABLE_WIFI:
setWifiEnabledBlocking(true, msg.arg1 == 1, msg.arg2);
sWakeLock.release();
break;
case MESSAGE_START_WIFI:
mWifiStateTracker.setScanOnlyMode(msg.arg1 != 0);
mWifiStateTracker.restart();
sWakeLock.release();
break;
case MESSAGE_DISABLE_WIFI:
// a non-zero msg.arg1 value means the "enabled" setting
// should be persisted
setWifiEnabledBlocking(false, msg.arg1 == 1, msg.arg2);
sWakeLock.release();
break;
case MESSAGE_STOP_WIFI:
mWifiStateTracker.disconnectAndStop();
// don't release wakelock
break;
case MESSAGE_RELEASE_WAKELOCK:
synchronized (sDriverStopWakeLock) {
if (sDriverStopWakeLock.isHeld()) {
sDriverStopWakeLock.release();
}
}
break;
}
}
}
@Override
protected 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 WifiService from from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
pw.println("Wi-Fi is " + stateName(mWifiState));
pw.println("Stay-awake conditions: " +
Settings.System.getInt(mContext.getContentResolver(),
Settings.System.STAY_ON_WHILE_PLUGGED_IN, 0));
pw.println();
pw.println("Internal state:");
pw.println(mWifiStateTracker);
pw.println();
pw.println("Latest scan results:");
List<ScanResult> scanResults = mWifiStateTracker.getScanResultsList();
if (scanResults != null && scanResults.size() != 0) {
pw.println(" BSSID Frequency RSSI Flags SSID");
for (ScanResult r : scanResults) {
pw.printf(" %17s %9d %5d %-16s %s%n",
r.BSSID,
r.frequency,
r.level,
r.capabilities,
r.SSID == null ? "" : r.SSID);
}
}
pw.println();
pw.println("Locks acquired: " + mFullLocksAcquired + " full, " +
mScanLocksAcquired + " scan");
pw.println("Locks released: " + mFullLocksReleased + " full, " +
mScanLocksReleased + " scan");
pw.println();
pw.println("Locks held:");
mLocks.dump(pw);
}
private static String stateName(int wifiState) {
switch (wifiState) {
case WIFI_STATE_DISABLING:
return "disabling";
case WIFI_STATE_DISABLED:
return "disabled";
case WIFI_STATE_ENABLING:
return "enabling";
case WIFI_STATE_ENABLED:
return "enabled";
case WIFI_STATE_UNKNOWN:
return "unknown state";
default:
return "[invalid state]";
}
}
private class WifiLock extends DeathRecipient {
WifiLock(int lockMode, String tag, IBinder binder) {
super(lockMode, tag, binder);
}
public void binderDied() {
synchronized (mLocks) {
releaseWifiLockLocked(mBinder);
}
}
public String toString() {
return "WifiLock{" + mTag + " type=" + mMode + " binder=" + mBinder + "}";
}
}
private class LockList {
private List<WifiLock> mList;
private LockList() {
mList = new ArrayList<WifiLock>();
}
private synchronized boolean hasLocks() {
return !mList.isEmpty();
}
private synchronized int getStrongestLockMode() {
if (mList.isEmpty()) {
return WifiManager.WIFI_MODE_FULL;
}
for (WifiLock l : mList) {
if (l.mMode == WifiManager.WIFI_MODE_FULL) {
return WifiManager.WIFI_MODE_FULL;
}
}
return WifiManager.WIFI_MODE_SCAN_ONLY;
}
private void addLock(WifiLock lock) {
if (findLockByBinder(lock.mBinder) < 0) {
mList.add(lock);
}
}
private WifiLock removeLock(IBinder binder) {
int index = findLockByBinder(binder);
if (index >= 0) {
WifiLock ret = mList.remove(index);
ret.unlinkDeathRecipient();
return ret;
} else {
return null;
}
}
private int findLockByBinder(IBinder binder) {
int size = mList.size();
for (int i = size - 1; i >= 0; i--)
if (mList.get(i).mBinder == binder)
return i;
return -1;
}
private void dump(PrintWriter pw) {
for (WifiLock l : mList) {
pw.print(" ");
pw.println(l);
}
}
}
public boolean acquireWifiLock(IBinder binder, int lockMode, String tag) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
if (lockMode != WifiManager.WIFI_MODE_FULL && lockMode != WifiManager.WIFI_MODE_SCAN_ONLY) {
return false;
}
WifiLock wifiLock = new WifiLock(lockMode, tag, binder);
synchronized (mLocks) {
return acquireWifiLockLocked(wifiLock);
}
}
private boolean acquireWifiLockLocked(WifiLock wifiLock) {
Log.d(TAG, "acquireWifiLockLocked: " + wifiLock);
mLocks.addLock(wifiLock);
int uid = Binder.getCallingUid();
long ident = Binder.clearCallingIdentity();
try {
switch(wifiLock.mMode) {
case WifiManager.WIFI_MODE_FULL:
++mFullLocksAcquired;
mBatteryStats.noteFullWifiLockAcquired(uid);
break;
case WifiManager.WIFI_MODE_SCAN_ONLY:
++mScanLocksAcquired;
mBatteryStats.noteScanWifiLockAcquired(uid);
break;
}
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
updateWifiState();
return true;
}
public boolean releaseWifiLock(IBinder lock) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.WAKE_LOCK, null);
synchronized (mLocks) {
return releaseWifiLockLocked(lock);
}
}
private boolean releaseWifiLockLocked(IBinder lock) {
boolean hadLock;
WifiLock wifiLock = mLocks.removeLock(lock);
Log.d(TAG, "releaseWifiLockLocked: " + wifiLock);
hadLock = (wifiLock != null);
if (hadLock) {
int uid = Binder.getCallingUid();
long ident = Binder.clearCallingIdentity();
try {
switch(wifiLock.mMode) {
case WifiManager.WIFI_MODE_FULL:
++mFullLocksReleased;
mBatteryStats.noteFullWifiLockReleased(uid);
break;
case WifiManager.WIFI_MODE_SCAN_ONLY:
++mScanLocksReleased;
mBatteryStats.noteScanWifiLockReleased(uid);
break;
}
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
// TODO - should this only happen if you hadLock?
updateWifiState();
return hadLock;
}
private abstract class DeathRecipient
implements IBinder.DeathRecipient {
String mTag;
int mMode;
IBinder mBinder;
DeathRecipient(int mode, String tag, IBinder binder) {
super();
mTag = tag;
mMode = mode;
mBinder = binder;
try {
mBinder.linkToDeath(this, 0);
} catch (RemoteException e) {
binderDied();
}
}
void unlinkDeathRecipient() {
mBinder.unlinkToDeath(this, 0);
}
}
private class Multicaster extends DeathRecipient {
Multicaster(String tag, IBinder binder) {
super(Binder.getCallingUid(), tag, binder);
}
public void binderDied() {
Log.e(TAG, "Multicaster binderDied");
synchronized (mMulticasters) {
int i = mMulticasters.indexOf(this);
if (i != -1) {
removeMulticasterLocked(i, mMode);
}
}
}
public String toString() {
return "Multicaster{" + mTag + " binder=" + mBinder + "}";
}
public int getUid() {
return mMode;
}
}
public void acquireMulticastLock(IBinder binder, String tag) {
enforceMulticastChangePermission();
synchronized (mMulticasters) {
mMulticastEnabled++;
mMulticasters.add(new Multicaster(tag, binder));
// Note that we could call stopPacketFiltering only when
// our new size == 1 (first call), but this function won't
// be called often and by making the stopPacket call each
// time we're less fragile and self-healing.
synchronized (mWifiStateTracker) {
WifiNative.stopPacketFiltering();
}
}
int uid = Binder.getCallingUid();
Long ident = Binder.clearCallingIdentity();
try {
mBatteryStats.noteWifiMulticastEnabled(uid);
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
public void releaseMulticastLock() {
enforceMulticastChangePermission();
int uid = Binder.getCallingUid();
synchronized (mMulticasters) {
mMulticastDisabled++;
int size = mMulticasters.size();
for (int i = size - 1; i >= 0; i--) {
Multicaster m = mMulticasters.get(i);
if ((m != null) && (m.getUid() == uid)) {
removeMulticasterLocked(i, uid);
}
}
}
}
private void removeMulticasterLocked(int i, int uid)
{
Multicaster removed = mMulticasters.remove(i);
if (removed != null) {
removed.unlinkDeathRecipient();
}
if (mMulticasters.size() == 0) {
synchronized (mWifiStateTracker) {
WifiNative.startPacketFiltering();
}
}
Long ident = Binder.clearCallingIdentity();
try {
mBatteryStats.noteWifiMulticastDisabled(uid);
} catch (RemoteException e) {
} finally {
Binder.restoreCallingIdentity(ident);
}
}
public boolean isMulticastEnabled() {
enforceAccessPermission();
synchronized (mMulticasters) {
return (mMulticasters.size() > 0);
}
}
}