| /* |
| * Copyright (C) 2018 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.appbinding; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.AppGlobals; |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.pm.IPackageManager; |
| import android.content.pm.ServiceInfo; |
| import android.database.ContentObserver; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.IInterface; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| import android.provider.Settings.Global; |
| import android.text.TextUtils; |
| import android.util.Slog; |
| import android.util.SparseBooleanArray; |
| |
| import com.android.internal.annotations.GuardedBy; |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.os.BackgroundThread; |
| import com.android.internal.util.DumpUtils; |
| import com.android.server.SystemService; |
| import com.android.server.am.PersistentConnection; |
| import com.android.server.appbinding.finders.AppServiceFinder; |
| import com.android.server.appbinding.finders.CarrierMessagingClientServiceFinder; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.util.ArrayList; |
| import java.util.function.Consumer; |
| |
| /** |
| * System server that keeps a binding to an app to keep it always running. |
| * |
| * <p>As of android Q, we only use it for the default SMS app. |
| * |
| * Relevant tests: |
| * atest CtsAppBindingHostTestCases |
| * |
| * TODO Maybe handle force-stop differently. Right now we just get "binder died" and re-bind |
| * after a timeout. b/116813347 |
| */ |
| public class AppBindingService extends Binder { |
| public static final String TAG = "AppBindingService"; |
| |
| public static final boolean DEBUG = false; // DO NOT SUBMIT WITH TRUE |
| |
| private final Object mLock = new Object(); |
| |
| private final Injector mInjector; |
| private final Context mContext; |
| private final Handler mHandler; |
| private final IPackageManager mIPackageManager; |
| |
| @GuardedBy("mLock") |
| private AppBindingConstants mConstants; |
| |
| @GuardedBy("mLock") |
| private final SparseBooleanArray mRunningUsers = new SparseBooleanArray(2); |
| |
| @GuardedBy("mLock") |
| private final ArrayList<AppServiceFinder> mApps = new ArrayList<>(); |
| |
| @GuardedBy("mLock") |
| private final ArrayList<AppServiceConnection> mConnections = new ArrayList<>(); |
| |
| static class Injector { |
| public IPackageManager getIPackageManager() { |
| return AppGlobals.getPackageManager(); |
| } |
| |
| public String getGlobalSettingString(ContentResolver resolver, String key) { |
| return Settings.Global.getString(resolver, key); |
| } |
| } |
| |
| /** |
| * {@link SystemService} for this service. |
| */ |
| public static class Lifecycle extends SystemService { |
| final AppBindingService mService; |
| |
| public Lifecycle(Context context) { |
| this(context, new Injector()); |
| } |
| |
| Lifecycle(Context context, Injector injector) { |
| super(context); |
| mService = new AppBindingService(injector, context); |
| } |
| |
| @Override |
| public void onStart() { |
| publishBinderService(Context.APP_BINDING_SERVICE, mService); |
| } |
| |
| @Override |
| public void onBootPhase(int phase) { |
| mService.onBootPhase(phase); |
| } |
| |
| @Override |
| public void onStartUser(int userHandle) { |
| mService.onStartUser(userHandle); |
| } |
| |
| @Override |
| public void onUnlockUser(int userId) { |
| mService.onUnlockUser(userId); |
| } |
| |
| @Override |
| public void onStopUser(int userHandle) { |
| mService.onStopUser(userHandle); |
| } |
| } |
| |
| private AppBindingService(Injector injector, Context context) { |
| mInjector = injector; |
| mContext = context; |
| |
| mIPackageManager = injector.getIPackageManager(); |
| |
| mHandler = BackgroundThread.getHandler(); |
| mApps.add(new CarrierMessagingClientServiceFinder(context, this::onAppChanged, mHandler)); |
| |
| // Initialize with the default value to make it non-null. |
| mConstants = AppBindingConstants.initializeFromString(""); |
| } |
| |
| private void forAllAppsLocked(Consumer<AppServiceFinder> consumer) { |
| for (int i = 0; i < mApps.size(); i++) { |
| consumer.accept(mApps.get(i)); |
| } |
| } |
| |
| private void onBootPhase(int phase) { |
| if (DEBUG) { |
| Slog.d(TAG, "onBootPhase: " + phase); |
| } |
| switch (phase) { |
| case SystemService.PHASE_ACTIVITY_MANAGER_READY: |
| onPhaseActivityManagerReady(); |
| break; |
| case SystemService.PHASE_THIRD_PARTY_APPS_CAN_START: |
| onPhaseThirdPartyAppsCanStart(); |
| break; |
| } |
| } |
| |
| /** |
| * Handle boot phase PHASE_ACTIVITY_MANAGER_READY. |
| */ |
| private void onPhaseActivityManagerReady() { |
| final IntentFilter packageFilter = new IntentFilter(); |
| packageFilter.addAction(Intent.ACTION_PACKAGE_ADDED); |
| packageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED); |
| packageFilter.addAction(Intent.ACTION_PACKAGE_CHANGED); |
| packageFilter.addDataScheme("package"); |
| |
| packageFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY); |
| mContext.registerReceiverAsUser(mPackageUserMonitor, UserHandle.ALL, |
| packageFilter, null, mHandler); |
| |
| final IntentFilter userFilter = new IntentFilter(); |
| userFilter.addAction(Intent.ACTION_USER_REMOVED); |
| mContext.registerReceiverAsUser(mPackageUserMonitor, UserHandle.ALL, |
| userFilter, null, mHandler); |
| |
| mContext.getContentResolver().registerContentObserver(Settings.Global.getUriFor( |
| Settings.Global.APP_BINDING_CONSTANTS), false, mSettingsObserver); |
| |
| refreshConstants(); |
| } |
| |
| private final ContentObserver mSettingsObserver = new ContentObserver(null) { |
| @Override |
| public void onChange(boolean selfChange) { |
| refreshConstants(); |
| } |
| }; |
| |
| private void refreshConstants() { |
| final String newSetting = mInjector.getGlobalSettingString( |
| mContext.getContentResolver(), Global.APP_BINDING_CONSTANTS); |
| |
| synchronized (mLock) { |
| if (TextUtils.equals(mConstants.sourceSettings, newSetting)) { |
| return; |
| } |
| Slog.i(TAG, "Updating constants with: " + newSetting); |
| mConstants = AppBindingConstants.initializeFromString(newSetting); |
| |
| rebindAllLocked("settings update"); |
| } |
| } |
| |
| @VisibleForTesting |
| final BroadcastReceiver mPackageUserMonitor = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (DEBUG) { |
| Slog.d(TAG, "Broadcast received: " + intent); |
| } |
| final int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, UserHandle.USER_NULL); |
| if (userId == UserHandle.USER_NULL) { |
| Slog.w(TAG, "Intent broadcast does not contain user handle: " + intent); |
| return; |
| } |
| |
| final String action = intent.getAction(); |
| |
| if (Intent.ACTION_USER_REMOVED.equals(action)) { |
| onUserRemoved(userId); |
| return; |
| } |
| |
| final Uri intentUri = intent.getData(); |
| final String packageName = (intentUri != null) ? intentUri.getSchemeSpecificPart() |
| : null; |
| if (packageName == null) { |
| Slog.w(TAG, "Intent broadcast does not contain package name: " + intent); |
| return; |
| } |
| |
| final boolean replacing = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false); |
| |
| switch (action) { |
| case Intent.ACTION_PACKAGE_ADDED: |
| if (replacing) { |
| handlePackageAddedReplacing(packageName, userId); |
| } |
| break; |
| case Intent.ACTION_PACKAGE_REMOVED: |
| if (!replacing) { |
| handlePackageRemoved(packageName, userId); |
| } |
| break; |
| case Intent.ACTION_PACKAGE_CHANGED: |
| handlePackageChanged(packageName, userId); |
| break; |
| } |
| } |
| }; |
| |
| /** |
| * Handle boot phase PHASE_THIRD_PARTY_APPS_CAN_START. |
| */ |
| private void onPhaseThirdPartyAppsCanStart() { |
| synchronized (mLock) { |
| forAllAppsLocked(AppServiceFinder::startMonitoring); |
| } |
| } |
| |
| /** User lifecycle callback. */ |
| private void onStartUser(int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "onStartUser: u" + userId); |
| } |
| synchronized (mLock) { |
| mRunningUsers.append(userId, true); |
| bindServicesLocked(userId, null, "user start"); |
| } |
| } |
| |
| /** User lifecycle callback. */ |
| private void onUnlockUser(int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "onUnlockUser: u" + userId); |
| } |
| synchronized (mLock) { |
| bindServicesLocked(userId, null, "user unlock"); |
| } |
| } |
| |
| /** User lifecycle callback. */ |
| private void onStopUser(int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "onStopUser: u" + userId); |
| } |
| synchronized (mLock) { |
| unbindServicesLocked(userId, null, "user stop"); |
| |
| mRunningUsers.delete(userId); |
| } |
| } |
| |
| private void onUserRemoved(int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "onUserRemoved: u" + userId); |
| } |
| synchronized (mLock) { |
| forAllAppsLocked((app) -> app.onUserRemoved(userId)); |
| |
| mRunningUsers.delete(userId); |
| } |
| } |
| |
| /** |
| * Called when a target package changes; e.g. when the user changes the default SMS app. |
| */ |
| private void onAppChanged(AppServiceFinder finder, int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "onAppChanged: u" + userId + " " + finder.getAppDescription()); |
| } |
| synchronized (mLock) { |
| final String reason = finder.getAppDescription() + " changed"; |
| unbindServicesLocked(userId, finder, reason); |
| bindServicesLocked(userId, finder, reason); |
| } |
| } |
| |
| @Nullable |
| private AppServiceFinder findFinderLocked(int userId, @NonNull String packageName) { |
| for (int i = 0; i < mApps.size(); i++) { |
| final AppServiceFinder app = mApps.get(i); |
| if (packageName.equals(app.getTargetPackage(userId))) { |
| return app; |
| } |
| } |
| return null; |
| } |
| |
| @Nullable |
| private AppServiceConnection findConnectionLock( |
| int userId, @NonNull AppServiceFinder target) { |
| for (int i = 0; i < mConnections.size(); i++) { |
| final AppServiceConnection conn = mConnections.get(i); |
| if ((conn.getUserId() == userId) && (conn.getFinder() == target)) { |
| return conn; |
| } |
| } |
| return null; |
| } |
| |
| private void handlePackageAddedReplacing(String packageName, int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "handlePackageAddedReplacing: u" + userId + " " + packageName); |
| } |
| synchronized (mLock) { |
| final AppServiceFinder finder = findFinderLocked(userId, packageName); |
| if (finder != null) { |
| unbindServicesLocked(userId, finder, "package update"); |
| bindServicesLocked(userId, finder, "package update"); |
| } |
| } |
| } |
| |
| private void handlePackageRemoved(String packageName, int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "handlePackageRemoved: u" + userId + " " + packageName); |
| } |
| synchronized (mLock) { |
| final AppServiceFinder finder = findFinderLocked(userId, packageName); |
| if (finder != null) { |
| unbindServicesLocked(userId, finder, "package uninstall"); |
| } |
| } |
| } |
| |
| private void handlePackageChanged(String packageName, int userId) { |
| if (DEBUG) { |
| Slog.d(TAG, "handlePackageChanged: u" + userId + " " + packageName); |
| } |
| synchronized (mLock) { |
| final AppServiceFinder finder = findFinderLocked(userId, packageName); |
| if (finder != null) { |
| unbindServicesLocked(userId, finder, "package changed"); |
| bindServicesLocked(userId, finder, "package changed"); |
| } |
| } |
| } |
| |
| private void rebindAllLocked(String reason) { |
| for (int i = 0; i < mRunningUsers.size(); i++) { |
| if (!mRunningUsers.valueAt(i)) { |
| continue; |
| } |
| final int userId = mRunningUsers.keyAt(i); |
| |
| unbindServicesLocked(userId, null, reason); |
| bindServicesLocked(userId, null, reason); |
| } |
| } |
| |
| private void bindServicesLocked(int userId, @Nullable AppServiceFinder target, |
| @NonNull String reasonForLog) { |
| for (int i = 0; i < mApps.size(); i++) { |
| final AppServiceFinder app = mApps.get(i); |
| if (target != null && target != app) { |
| continue; |
| } |
| |
| // Disconnect from existing binding. |
| final AppServiceConnection existingConn = findConnectionLock(userId, app); |
| if (existingConn != null) { |
| unbindServicesLocked(userId, target, reasonForLog); |
| } |
| |
| final ServiceInfo service = app.findService(userId, mIPackageManager, mConstants); |
| if (service == null) { |
| continue; |
| } |
| if (DEBUG) { |
| Slog.d(TAG, "bindServicesLocked: u" + userId + " " + app.getAppDescription() |
| + " binding " + service.getComponentName() + " for " + reasonForLog); |
| } |
| final AppServiceConnection conn = |
| new AppServiceConnection(mContext, userId, mConstants, mHandler, |
| app, service.getComponentName()); |
| mConnections.add(conn); |
| conn.bind(); |
| } |
| } |
| |
| private void unbindServicesLocked(int userId, @Nullable AppServiceFinder target, |
| @NonNull String reasonForLog) { |
| for (int i = mConnections.size() - 1; i >= 0; i--) { |
| final AppServiceConnection conn = mConnections.get(i); |
| if ((conn.getUserId() != userId) |
| || (target != null && conn.getFinder() != target)) { |
| continue; |
| } |
| if (DEBUG) { |
| Slog.d(TAG, "unbindServicesLocked: u" + userId |
| + " " + conn.getFinder().getAppDescription() |
| + " unbinding " + conn.getComponentName() + " for " + reasonForLog); |
| } |
| mConnections.remove(i); |
| conn.unbind(); |
| } |
| } |
| |
| private static class AppServiceConnection extends PersistentConnection<IInterface> { |
| private final AppBindingConstants mConstants; |
| private final AppServiceFinder mFinder; |
| |
| AppServiceConnection(Context context, int userId, AppBindingConstants constants, |
| Handler handler, AppServiceFinder finder, |
| @NonNull ComponentName componentName) { |
| super(TAG, context, handler, userId, componentName, |
| constants.SERVICE_RECONNECT_BACKOFF_SEC, |
| constants.SERVICE_RECONNECT_BACKOFF_INCREASE, |
| constants.SERVICE_RECONNECT_MAX_BACKOFF_SEC, |
| constants.SERVICE_STABLE_CONNECTION_THRESHOLD_SEC); |
| mFinder = finder; |
| mConstants = constants; |
| } |
| |
| @Override |
| protected int getBindFlags() { |
| return mFinder.getBindFlags(mConstants); |
| } |
| |
| @Override |
| protected IInterface asInterface(IBinder obj) { |
| return mFinder.asInterface(obj); |
| } |
| |
| public AppServiceFinder getFinder() { |
| return mFinder; |
| } |
| } |
| |
| @Override |
| public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| if (!DumpUtils.checkDumpPermission(mContext, TAG, pw)) return; |
| |
| if (args.length > 0 && "-s".equals(args[0])) { |
| dumpSimple(pw); |
| return; |
| } |
| |
| synchronized (mLock) { |
| mConstants.dump(" ", pw); |
| |
| pw.println(); |
| pw.print(" Running users:"); |
| for (int i = 0; i < mRunningUsers.size(); i++) { |
| if (mRunningUsers.valueAt(i)) { |
| pw.print(" "); |
| pw.print(mRunningUsers.keyAt(i)); |
| } |
| } |
| |
| pw.println(); |
| pw.println(" Connections:"); |
| for (int i = 0; i < mConnections.size(); i++) { |
| final AppServiceConnection conn = mConnections.get(i); |
| pw.print(" App type: "); |
| pw.print(conn.getFinder().getAppDescription()); |
| pw.println(); |
| |
| conn.dump(" ", pw); |
| } |
| if (mConnections.size() == 0) { |
| pw.println(" None:"); |
| } |
| |
| pw.println(); |
| pw.println(" Finders:"); |
| forAllAppsLocked((app) -> app.dump(" ", pw)); |
| } |
| } |
| |
| /** |
| * Print simple output for CTS. |
| */ |
| private void dumpSimple(PrintWriter pw) { |
| synchronized (mLock) { |
| for (int i = 0; i < mConnections.size(); i++) { |
| final AppServiceConnection conn = mConnections.get(i); |
| |
| pw.print("conn,"); |
| pw.print(conn.getFinder().getAppDescription()); |
| pw.print(","); |
| pw.print(conn.getUserId()); |
| pw.print(","); |
| pw.print(conn.getComponentName().getPackageName()); |
| pw.print(","); |
| pw.print(conn.getComponentName().getClassName()); |
| pw.print(","); |
| pw.print(conn.isBound() ? "bound" : "not-bound"); |
| pw.print(","); |
| pw.print(conn.isConnected() ? "connected" : "not-connected"); |
| pw.print(",#con="); |
| pw.print(conn.getNumConnected()); |
| pw.print(",#dis="); |
| pw.print(conn.getNumDisconnected()); |
| pw.print(",#died="); |
| pw.print(conn.getNumBindingDied()); |
| pw.print(",backoff="); |
| pw.print(conn.getNextBackoffMs()); |
| pw.println(); |
| } |
| forAllAppsLocked((app) -> app.dumpSimple(pw)); |
| } |
| } |
| |
| AppBindingConstants getConstantsForTest() { |
| return mConstants; |
| } |
| } |