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android_frameworks_base/services/java/com/android/server/ConnectivityService.java

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Initial Contribution
2008-10-21 07:00:00 -07:00
/*
* 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 android.app.Notification;
import android.app.NotificationManager;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.ConnectivityManager;
import android.net.IConnectivityManager;
import android.net.MobileDataStateTracker;
import android.net.NetworkInfo;
import android.net.NetworkStateTracker;
import android.net.wifi.WifiStateTracker;
import android.os.Binder;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.ServiceManager;
import android.os.SystemProperties;
import android.provider.Settings;
import android.telephony.TelephonyManager;
import android.util.EventLog;
import android.util.Log;
import java.io.FileDescriptor;
import java.io.PrintWriter;
/**
* {@hide}
*/
public class ConnectivityService extends IConnectivityManager.Stub {
private static final boolean DBG = false;
private static final String TAG = "ConnectivityService";
// Event log tags (must be in sync with event-log-tags)
private static final int EVENTLOG_CONNECTIVITY_STATE_CHANGED = 50020;
/**
* Sometimes we want to refer to the individual network state
* trackers separately, and sometimes we just want to treat them
* abstractly.
*/
private NetworkStateTracker mNetTrackers[];
private boolean mTeardownRequested[];
private WifiStateTracker mWifiStateTracker;
private MobileDataStateTracker mMobileDataStateTracker;
private WifiWatchdogService mWifiWatchdogService;
private Context mContext;
private int mNetworkPreference;
private NetworkStateTracker mActiveNetwork;
private int mNumDnsEntries;
private static int mDnsChangeCounter;
private boolean mTestMode;
private static ConnectivityService sServiceInstance;
private static class ConnectivityThread extends Thread {
private Context mContext;
private ConnectivityThread(Context context) {
super("ConnectivityThread");
mContext = context;
}
@Override
public void run() {
Looper.prepare();
synchronized (this) {
sServiceInstance = new ConnectivityService(mContext);
notifyAll();
}
Looper.loop();
}
public static ConnectivityService getServiceInstance(Context context) {
ConnectivityThread thread = new ConnectivityThread(context);
thread.start();
synchronized (thread) {
while (sServiceInstance == null) {
try {
// Wait until sServiceInstance has been initialized.
thread.wait();
} catch (InterruptedException e) {
}
}
}
return sServiceInstance;
}
}
public static ConnectivityService getInstance(Context context) {
return ConnectivityThread.getServiceInstance(context);
}
private ConnectivityService(Context context) {
if (DBG) Log.v(TAG, "ConnectivityService starting up");
mContext = context;
mNetTrackers = new NetworkStateTracker[2];
mTeardownRequested = new boolean[2];
Handler handler = new MyHandler();
mNetworkPreference = getPersistedNetworkPreference();
/*
* Create the network state trackers for Wi-Fi and mobile
* data. Maybe this could be done with a factory class,
* but it's not clear that it's worth it, given that
* the number of different network types is not going
* to change very often.
*/
if (DBG) Log.v(TAG, "Starting Wifi Service.");
mWifiStateTracker = new WifiStateTracker(context, handler);
WifiService wifiService = new WifiService(context, mWifiStateTracker);
ServiceManager.addService(Context.WIFI_SERVICE, wifiService);
// The WifiStateTracker should appear first in the list
mNetTrackers[ConnectivityManager.TYPE_WIFI] = mWifiStateTracker;
mMobileDataStateTracker = new MobileDataStateTracker(context, handler);
mNetTrackers[ConnectivityManager.TYPE_MOBILE] = mMobileDataStateTracker;
mActiveNetwork = null;
mNumDnsEntries = 0;
mTestMode = SystemProperties.get("cm.test.mode").equals("true")
&& SystemProperties.get("ro.build.type").equals("eng");
for (NetworkStateTracker t : mNetTrackers)
t.startMonitoring();
// Constructing this starts it too
mWifiWatchdogService = new WifiWatchdogService(context, mWifiStateTracker);
}
/**
* Sets the preferred network.
* @param preference the new preference
*/
public synchronized void setNetworkPreference(int preference) {
enforceChangePermission();
if (ConnectivityManager.isNetworkTypeValid(preference)) {
int oldPreference = mNetworkPreference;
persistNetworkPreference(preference);
if (mNetworkPreference != oldPreference)
enforcePreference();
}
}
public int getNetworkPreference() {
enforceAccessPermission();
return mNetworkPreference;
}
private void persistNetworkPreference(int networkPreference) {
final ContentResolver cr = mContext.getContentResolver();
Settings.System.putInt(cr, Settings.System.NETWORK_PREFERENCE, networkPreference);
}
private int getPersistedNetworkPreference() {
final ContentResolver cr = mContext.getContentResolver();
final int networkPrefSetting = Settings.System
.getInt(cr, Settings.System.NETWORK_PREFERENCE, -1);
if (networkPrefSetting != -1) {
return networkPrefSetting;
}
return ConnectivityManager.DEFAULT_NETWORK_PREFERENCE;
}
/**
* Make the state of network connectivity conform to the preference settings.
* In this method, we only tear down a non-preferred network. Establishing
* a connection to the preferred network is taken care of when we handle
* the disconnect event from the non-preferred network
* (see {@link #handleDisconnect(NetworkInfo)}).
*/
private void enforcePreference() {
if (mActiveNetwork == null)
return;
for (NetworkStateTracker t : mNetTrackers) {
if (t == mActiveNetwork) {
int netType = t.getNetworkInfo().getType();
int otherNetType = ((netType == ConnectivityManager.TYPE_WIFI) ?
ConnectivityManager.TYPE_MOBILE :
ConnectivityManager.TYPE_WIFI);
if (t.getNetworkInfo().getType() != mNetworkPreference) {
NetworkStateTracker otherTracker = mNetTrackers[otherNetType];
if (otherTracker.isAvailable()) {
teardown(t);
}
}
}
}
}
private boolean teardown(NetworkStateTracker netTracker) {
if (netTracker.teardown()) {
mTeardownRequested[netTracker.getNetworkInfo().getType()] = true;
return true;
} else {
return false;
}
}
/**
* Return NetworkInfo for the active network interface. It is assumed that at most
* one network is active at a time. If more than one is active, it is indeterminate
* which will be returned.
* @return the info for the active network, or {@code null} if none is active
*/
public NetworkInfo getActiveNetworkInfo() {
enforceAccessPermission();
for (NetworkStateTracker t : mNetTrackers) {
NetworkInfo info = t.getNetworkInfo();
if (info.isConnected()) {
return info;
}
}
return null;
}
public NetworkInfo getNetworkInfo(int networkType) {
enforceAccessPermission();
if (ConnectivityManager.isNetworkTypeValid(networkType)) {
NetworkStateTracker t = mNetTrackers[networkType];
if (t != null)
return t.getNetworkInfo();
}
return null;
}
public NetworkInfo[] getAllNetworkInfo() {
enforceAccessPermission();
NetworkInfo[] result = new NetworkInfo[mNetTrackers.length];
int i = 0;
for (NetworkStateTracker t : mNetTrackers) {
result[i++] = t.getNetworkInfo();
}
return result;
}
public boolean setRadios(boolean turnOn) {
boolean result = true;
enforceChangePermission();
for (NetworkStateTracker t : mNetTrackers) {
result = t.setRadio(turnOn) && result;
}
return result;
}
public boolean setRadio(int netType, boolean turnOn) {
enforceChangePermission();
if (!ConnectivityManager.isNetworkTypeValid(netType)) {
return false;
}
NetworkStateTracker tracker = mNetTrackers[netType];
return tracker != null && tracker.setRadio(turnOn);
}
public int startUsingNetworkFeature(int networkType, String feature) {
enforceChangePermission();
if (!ConnectivityManager.isNetworkTypeValid(networkType)) {
return -1;
}
NetworkStateTracker tracker = mNetTrackers[networkType];
if (tracker != null) {
return tracker.startUsingNetworkFeature(feature, getCallingPid(), getCallingUid());
}
return -1;
}
public int stopUsingNetworkFeature(int networkType, String feature) {
enforceChangePermission();
if (!ConnectivityManager.isNetworkTypeValid(networkType)) {
return -1;
}
NetworkStateTracker tracker = mNetTrackers[networkType];
if (tracker != null) {
return tracker.stopUsingNetworkFeature(feature, getCallingPid(), getCallingUid());
}
return -1;
}
/**
* Ensure that a network route exists to deliver traffic to the specified
* host via the specified network interface.
* @param networkType the type of the network over which traffic to the specified
* host is to be routed
* @param hostAddress the IP address of the host to which the route is desired
* @return {@code true} on success, {@code false} on failure
*/
public boolean requestRouteToHost(int networkType, int hostAddress) {
enforceChangePermission();
if (!ConnectivityManager.isNetworkTypeValid(networkType)) {
return false;
}
NetworkStateTracker tracker = mNetTrackers[networkType];
/*
* If there's only one connected network, and it's the one requested,
* then we don't have to do anything - the requested route already
* exists. If it's not the requested network, then it's not possible
* to establish the requested route. Finally, if there is more than
* one connected network, then we must insert an entry in the routing
* table.
*/
if (getNumConnectedNetworks() > 1) {
return tracker.requestRouteToHost(hostAddress);
} else {
return tracker.getNetworkInfo().getType() == networkType;
}
}
private int getNumConnectedNetworks() {
int numConnectedNets = 0;
for (NetworkStateTracker nt : mNetTrackers) {
if (nt.getNetworkInfo().isConnected()
&& !mTeardownRequested[nt.getNetworkInfo().getType()]) {
++numConnectedNets;
}
}
return numConnectedNets;
}
private void enforceAccessPermission() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.ACCESS_NETWORK_STATE,
"ConnectivityService");
}
private void enforceChangePermission() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.CHANGE_NETWORK_STATE,
"ConnectivityService");
}
/**
* Handle a {@code DISCONNECTED} event. If this pertains to the non-active network,
* we ignore it. If it is for the active network, we send out a broadcast.
* But first, we check whether it might be possible to connect to a different
* network.
* @param info the {@code NetworkInfo} for the network
*/
private void handleDisconnect(NetworkInfo info) {
if (DBG) Log.v(TAG, "Handle DISCONNECT for " + info.getTypeName());
/*
* If the disconnected network is not the active one, then don't report
* this as a loss of connectivity. What probably happened is that we're
* getting the disconnect for a network that we explicitly disabled
* in accordance with network preference policies.
*/
mTeardownRequested[info.getType()] = false;
if (mActiveNetwork == null || info.getType() != mActiveNetwork.getNetworkInfo().getType())
return;
NetworkStateTracker newNet;
if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
newNet = mWifiStateTracker;
} else /* info().getType() == TYPE_WIFI */ {
newNet = mMobileDataStateTracker;
}
NetworkInfo switchTo = null;
if (newNet.isAvailable()) {
mActiveNetwork = newNet;
switchTo = newNet.getNetworkInfo();
switchTo.setFailover(true);
if (!switchTo.isConnectedOrConnecting())
newNet.reconnect();
}
boolean otherNetworkConnected = false;
Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION);
intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info);
if (info.isFailover()) {
intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true);
info.setFailover(false);
}
if (info.getReason() != null) {
intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason());
}
if (info.getExtraInfo() != null) {
intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, info.getExtraInfo());
}
if (switchTo != null) {
otherNetworkConnected = switchTo.isConnected();
if (DBG) {
if (otherNetworkConnected) {
Log.v(TAG, "Switching to already connected " + switchTo.getTypeName());
} else {
Log.v(TAG, "Attempting to switch to " + switchTo.getTypeName());
}
}
intent.putExtra(ConnectivityManager.EXTRA_OTHER_NETWORK_INFO, switchTo);
} else {
intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, true);
}
if (DBG) Log.v(TAG, "Sending DISCONNECT bcast for " + info.getTypeName() +
(switchTo == null ? "" : " other=" + switchTo.getTypeName()));
mContext.sendStickyBroadcast(intent);
/*
* If the failover network is already connected, then immediately send out
* a followup broadcast indicating successful failover
*/
if (switchTo != null && otherNetworkConnected)
sendConnectedBroadcast(switchTo);
}
private void sendConnectedBroadcast(NetworkInfo info) {
Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION);
intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info);
if (info.isFailover()) {
intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true);
info.setFailover(false);
}
if (info.getReason() != null) {
intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason());
}
if (info.getExtraInfo() != null) {
intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, info.getExtraInfo());
}
mContext.sendStickyBroadcast(intent);
}
private void handleConnectionFailure(NetworkInfo info) {
mTeardownRequested[info.getType()] = false;
if (getActiveNetworkInfo() == null) {
String reason = info.getReason();
String extraInfo = info.getExtraInfo();
if (DBG) {
String reasonText;
if (reason == null) {
reasonText = ".";
} else {
reasonText = " (" + reason + ").";
}
Log.v(TAG, "Attempt to connect to " + info.getTypeName() + " failed" + reasonText);
}
Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION);
intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info);
intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, true);
if (reason != null) {
intent.putExtra(ConnectivityManager.EXTRA_REASON, reason);
}
if (extraInfo != null) {
intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, extraInfo);
}
if (info.isFailover()) {
intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true);
info.setFailover(false);
}
mContext.sendStickyBroadcast(intent);
}
}
private void handleConnect(NetworkInfo info) {
if (DBG) Log.v(TAG, "Handle CONNECT for " + info.getTypeName());
// snapshot isFailover, because sendConnectedBroadcast() resets it
boolean isFailover = info.isFailover();
NetworkStateTracker thisNet = mNetTrackers[info.getType()];
NetworkStateTracker deadnet = null;
NetworkStateTracker otherNet;
if (info.getType() == ConnectivityManager.TYPE_MOBILE) {
otherNet = mWifiStateTracker;
} else /* info().getType() == TYPE_WIFI */ {
otherNet = mMobileDataStateTracker;
}
/*
* Check policy to see whether we are now connected to a network that
* takes precedence over the other one. If so, we need to tear down
* the other one.
*/
NetworkInfo wifiInfo = mWifiStateTracker.getNetworkInfo();
NetworkInfo mobileInfo = mMobileDataStateTracker.getNetworkInfo();
if (wifiInfo.isConnected() && mobileInfo.isConnected()) {
if (mNetworkPreference == ConnectivityManager.TYPE_WIFI)
deadnet = mMobileDataStateTracker;
else
deadnet = mWifiStateTracker;
}
boolean toredown = false;
mTeardownRequested[info.getType()] = false;
if (!mTestMode && deadnet != null) {
if (DBG) Log.v(TAG, "Policy requires " +
deadnet.getNetworkInfo().getTypeName() + " teardown");
toredown = teardown(deadnet);
if (DBG && !toredown) {
Log.d(TAG, "Network declined teardown request");
}
}
if (!toredown || deadnet.getNetworkInfo().getType() != info.getType()) {
mActiveNetwork = thisNet;
if (DBG) Log.v(TAG, "Sending CONNECT bcast for " + info.getTypeName());
thisNet.updateNetworkSettings();
sendConnectedBroadcast(info);
if (isFailover) {
otherNet.releaseWakeLock();
}
} else {
if (DBG) Log.v(TAG, "Not broadcasting CONNECT_ACTION to torn down network " +
info.getTypeName());
}
}
private void handleScanResultsAvailable(NetworkInfo info) {
int networkType = info.getType();
if (networkType != ConnectivityManager.TYPE_WIFI) {
if (DBG) Log.v(TAG, "Got ScanResultsAvailable for " + info.getTypeName() + " network."
+ " Don't know how to handle.");
}
mNetTrackers[networkType].interpretScanResultsAvailable();
}
private void handleNotificationChange(boolean visible, int id, Notification notification) {
NotificationManager notificationManager = (NotificationManager) mContext
.getSystemService(Context.NOTIFICATION_SERVICE);
if (visible) {
notificationManager.notify(id, notification);
} else {
notificationManager.cancel(id);
}
}
/**
* After any kind of change in the connectivity state of any network,
* make sure that anything that depends on the connectivity state of
* more than one network is set up correctly. We're mainly concerned
* with making sure that the list of DNS servers is set up according
* to which networks are connected, and ensuring that the right routing
* table entries exist.
*/
private void handleConnectivityChange() {
/*
* If both mobile and wifi are enabled, add the host routes that
* will allow MMS traffic to pass on the mobile network. But
* remove the default route for the mobile network, so that there
* will be only one default route, to ensure that all traffic
* except MMS will travel via Wi-Fi.
*/
int numConnectedNets = handleConfigurationChange();
if (numConnectedNets > 1) {
mMobileDataStateTracker.addPrivateRoutes();
mMobileDataStateTracker.removeDefaultRoute();
} else if (mMobileDataStateTracker.getNetworkInfo().isConnected()) {
mMobileDataStateTracker.removePrivateRoutes();
mMobileDataStateTracker.restoreDefaultRoute();
}
}
private int handleConfigurationChange() {
/*
* Set DNS properties. Always put Wi-Fi entries at the front of
* the list if it is active.
*/
int index = 1;
String lastDns = "";
int numConnectedNets = 0;
int incrValue = ConnectivityManager.TYPE_MOBILE - ConnectivityManager.TYPE_WIFI;
int stopValue = ConnectivityManager.TYPE_MOBILE + incrValue;
for (int net = ConnectivityManager.TYPE_WIFI; net != stopValue; net += incrValue) {
NetworkStateTracker nt = mNetTrackers[net];
if (nt.getNetworkInfo().isConnected()
&& !mTeardownRequested[nt.getNetworkInfo().getType()]) {
++numConnectedNets;
String[] dnsList = nt.getNameServers();
for (int i = 0; i < dnsList.length && dnsList[i] != null; i++) {
// skip duplicate entries
if (!dnsList[i].equals(lastDns)) {
SystemProperties.set("net.dns" + index++, dnsList[i]);
lastDns = dnsList[i];
}
}
}
}
// Null out any DNS properties that are no longer used
for (int i = index; i <= mNumDnsEntries; i++) {
SystemProperties.set("net.dns" + i, "");
}
mNumDnsEntries = index - 1;
// Notify the name resolver library of the change
SystemProperties.set("net.dnschange", String.valueOf(mDnsChangeCounter++));
return numConnectedNets;
}
@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (mContext.checkCallingPermission(android.Manifest.permission.DUMP)
!= PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump ConnectivityService from from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
if (mActiveNetwork == null) {
pw.println("No active network");
} else {
pw.println("Active network: " + mActiveNetwork.getNetworkInfo().getTypeName());
}
pw.println();
for (NetworkStateTracker nst : mNetTrackers) {
pw.println(nst.getNetworkInfo());
pw.println(nst);
pw.println();
}
}
private class MyHandler extends Handler {
@Override
public void handleMessage(Message msg) {
NetworkInfo info;
switch (msg.what) {
case NetworkStateTracker.EVENT_STATE_CHANGED:
info = (NetworkInfo) msg.obj;
if (DBG) Log.v(TAG, "ConnectivityChange for " + info.getTypeName() + ": " +
info.getState() + "/" + info.getDetailedState());
// Connectivity state changed:
// [31-11] Reserved for future use
// [10-9] Mobile network connection type (as defined by the TelephonyManager)
// [8-3] Detailed state ordinal (as defined by NetworkInfo.DetailedState)
// [2-0] Network type (as defined by ConnectivityManager)
int eventLogParam = (info.getType() & 0x7) |
((info.getDetailedState().ordinal() & 0x3f) << 3) |
(TelephonyManager.getDefault().getNetworkType() << 9);
EventLog.writeEvent(EVENTLOG_CONNECTIVITY_STATE_CHANGED, eventLogParam);
if (info.getDetailedState() == NetworkInfo.DetailedState.FAILED) {
handleConnectionFailure(info);
} else if (info.getState() == NetworkInfo.State.DISCONNECTED) {
handleDisconnect(info);
} else if (info.getState() == NetworkInfo.State.SUSPENDED) {
// TODO: need to think this over.
// the logic here is, handle SUSPENDED the same as DISCONNECTED. The
// only difference being we are broadcasting an intent with NetworkInfo
// that's suspended. This allows the applications an opportunity to
// handle DISCONNECTED and SUSPENDED differently, or not.
handleDisconnect(info);
} else if (info.getState() == NetworkInfo.State.CONNECTED) {
handleConnect(info);
}
handleConnectivityChange();
break;
case NetworkStateTracker.EVENT_SCAN_RESULTS_AVAILABLE:
info = (NetworkInfo) msg.obj;
handleScanResultsAvailable(info);
break;
case NetworkStateTracker.EVENT_NOTIFICATION_CHANGED:
handleNotificationChange(msg.arg1 == 1, msg.arg2, (Notification) msg.obj);
case NetworkStateTracker.EVENT_CONFIGURATION_CHANGED:
handleConfigurationChange();
break;
}
}
}
}
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