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LeafOS / LeafOS-Project / android_frameworks_base / 8a970637208207955fb6a719bd82902384b3c743 / . / services / java / com / android / server / BackupManagerService.java
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/*
* Copyright (C) 2009 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.ActivityManagerNative;
import android.app.AlarmManager;
import android.app.AppGlobals;
import android.app.IActivityManager;
import android.app.IApplicationThread;
import android.app.IBackupAgent;
import android.app.PendingIntent;
import android.app.backup.BackupAgent;
import android.app.backup.BackupDataOutput;
import android.app.backup.FullBackup;
import android.app.backup.RestoreSet;
import android.app.backup.IBackupManager;
import android.app.backup.IFullBackupRestoreObserver;
import android.app.backup.IRestoreObserver;
import android.app.backup.IRestoreSession;
import android.content.ActivityNotFoundException;
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.ServiceConnection;
import android.content.pm.ApplicationInfo;
import android.content.pm.IPackageDataObserver;
import android.content.pm.IPackageDeleteObserver;
import android.content.pm.IPackageInstallObserver;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.pm.Signature;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.Binder;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.os.PowerManager;
import android.os.Process;
import android.os.RemoteException;
import android.os.SELinux;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.UserHandle;
import android.os.WorkSource;
import android.os.Environment.UserEnvironment;
import android.os.storage.IMountService;
import android.provider.Settings;
import android.util.EventLog;
import android.util.Log;
import android.util.Slog;
import android.util.SparseArray;
import android.util.StringBuilderPrinter;
import com.android.internal.backup.BackupConstants;
import com.android.internal.backup.IBackupTransport;
import com.android.internal.backup.IObbBackupService;
import com.android.server.EventLogTags;
import com.android.server.PackageManagerBackupAgent.Metadata;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterInputStream;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
class BackupManagerService extends IBackupManager.Stub {
private static final String TAG = "BackupManagerService";
private static final boolean DEBUG = true;
private static final boolean MORE_DEBUG = false;
// Historical and current algorithm names
static final String PBKDF_CURRENT = "PBKDF2WithHmacSHA1";
static final String PBKDF_FALLBACK = "PBKDF2WithHmacSHA1And8bit";
// Name and current contents version of the full-backup manifest file
static final String BACKUP_MANIFEST_FILENAME = "_manifest";
static final int BACKUP_MANIFEST_VERSION = 1;
static final String BACKUP_FILE_HEADER_MAGIC = "ANDROID BACKUP\n";
static final int BACKUP_FILE_VERSION = 2;
static final int BACKUP_PW_FILE_VERSION = 2;
static final boolean COMPRESS_FULL_BACKUPS = true; // should be true in production
static final String SHARED_BACKUP_AGENT_PACKAGE = "com.android.sharedstoragebackup";
static final String SERVICE_ACTION_TRANSPORT_HOST = "android.backup.TRANSPORT_HOST";
// How often we perform a backup pass. Privileged external callers can
// trigger an immediate pass.
private static final long BACKUP_INTERVAL = AlarmManager.INTERVAL_HOUR;
// Random variation in backup scheduling time to avoid server load spikes
private static final int FUZZ_MILLIS = 5 * 60 * 1000;
// The amount of time between the initial provisioning of the device and
// the first backup pass.
private static final long FIRST_BACKUP_INTERVAL = 12 * AlarmManager.INTERVAL_HOUR;
// Retry interval for clear/init when the transport is unavailable
private static final long TRANSPORT_RETRY_INTERVAL = 1 * AlarmManager.INTERVAL_HOUR;
private static final String RUN_BACKUP_ACTION = "android.app.backup.intent.RUN";
private static final String RUN_INITIALIZE_ACTION = "android.app.backup.intent.INIT";
private static final String RUN_CLEAR_ACTION = "android.app.backup.intent.CLEAR";
private static final int MSG_RUN_BACKUP = 1;
private static final int MSG_RUN_FULL_BACKUP = 2;
private static final int MSG_RUN_RESTORE = 3;
private static final int MSG_RUN_CLEAR = 4;
private static final int MSG_RUN_INITIALIZE = 5;
private static final int MSG_RUN_GET_RESTORE_SETS = 6;
private static final int MSG_TIMEOUT = 7;
private static final int MSG_RESTORE_TIMEOUT = 8;
private static final int MSG_FULL_CONFIRMATION_TIMEOUT = 9;
private static final int MSG_RUN_FULL_RESTORE = 10;
private static final int MSG_RETRY_INIT = 11;
private static final int MSG_RETRY_CLEAR = 12;
// backup task state machine tick
static final int MSG_BACKUP_RESTORE_STEP = 20;
static final int MSG_OP_COMPLETE = 21;
// Timeout interval for deciding that a bind or clear-data has taken too long
static final long TIMEOUT_INTERVAL = 10 * 1000;
// Timeout intervals for agent backup & restore operations
static final long TIMEOUT_BACKUP_INTERVAL = 30 * 1000;
static final long TIMEOUT_FULL_BACKUP_INTERVAL = 5 * 60 * 1000;
static final long TIMEOUT_SHARED_BACKUP_INTERVAL = 30 * 60 * 1000;
static final long TIMEOUT_RESTORE_INTERVAL = 60 * 1000;
// User confirmation timeout for a full backup/restore operation. It's this long in
// order to give them time to enter the backup password.
static final long TIMEOUT_FULL_CONFIRMATION = 60 * 1000;
private Context mContext;
private PackageManager mPackageManager;
IPackageManager mPackageManagerBinder;
private IActivityManager mActivityManager;
private PowerManager mPowerManager;
private AlarmManager mAlarmManager;
private IMountService mMountService;
IBackupManager mBackupManagerBinder;
boolean mEnabled; // access to this is synchronized on 'this'
boolean mProvisioned;
boolean mAutoRestore;
PowerManager.WakeLock mWakelock;
HandlerThread mHandlerThread;
BackupHandler mBackupHandler;
PendingIntent mRunBackupIntent, mRunInitIntent;
BroadcastReceiver mRunBackupReceiver, mRunInitReceiver;
// map UIDs to the set of participating packages under that UID
final SparseArray<HashSet<String>> mBackupParticipants
= new SparseArray<HashSet<String>>();
// set of backup services that have pending changes
class BackupRequest {
public String packageName;
BackupRequest(String pkgName) {
packageName = pkgName;
}
public String toString() {
return "BackupRequest{pkg=" + packageName + "}";
}
}
// Backups that we haven't started yet. Keys are package names.
HashMap<String,BackupRequest> mPendingBackups
= new HashMap<String,BackupRequest>();
// Pseudoname that we use for the Package Manager metadata "package"
static final String PACKAGE_MANAGER_SENTINEL = "@pm@";
// locking around the pending-backup management
final Object mQueueLock = new Object();
// The thread performing the sequence of queued backups binds to each app's agent
// in succession. Bind notifications are asynchronously delivered through the
// Activity Manager; use this lock object to signal when a requested binding has
// completed.
final Object mAgentConnectLock = new Object();
IBackupAgent mConnectedAgent;
volatile boolean mBackupRunning;
volatile boolean mConnecting;
volatile long mLastBackupPass;
volatile long mNextBackupPass;
// For debugging, we maintain a progress trace of operations during backup
static final boolean DEBUG_BACKUP_TRACE = true;
final List<String> mBackupTrace = new ArrayList<String>();
// A similar synchronization mechanism around clearing apps' data for restore
final Object mClearDataLock = new Object();
volatile boolean mClearingData;
// Transport bookkeeping
final HashMap<String,String> mTransportNames
= new HashMap<String,String>(); // component name -> registration name
final HashMap<String,IBackupTransport> mTransports
= new HashMap<String,IBackupTransport>(); // registration name -> binder
final ArrayList<TransportConnection> mTransportConnections
= new ArrayList<TransportConnection>();
String mCurrentTransport;
ActiveRestoreSession mActiveRestoreSession;
// Watch the device provisioning operation during setup
ContentObserver mProvisionedObserver;
class ProvisionedObserver extends ContentObserver {
public ProvisionedObserver(Handler handler) {
super(handler);
}
public void onChange(boolean selfChange) {
final boolean wasProvisioned = mProvisioned;
final boolean isProvisioned = deviceIsProvisioned();
// latch: never unprovision
mProvisioned = wasProvisioned || isProvisioned;
if (MORE_DEBUG) {
Slog.d(TAG, "Provisioning change: was=" + wasProvisioned
+ " is=" + isProvisioned + " now=" + mProvisioned);
}
synchronized (mQueueLock) {
if (mProvisioned && !wasProvisioned && mEnabled) {
// we're now good to go, so start the backup alarms
if (MORE_DEBUG) Slog.d(TAG, "Now provisioned, so starting backups");
startBackupAlarmsLocked(FIRST_BACKUP_INTERVAL);
}
}
}
}
class RestoreGetSetsParams {
public IBackupTransport transport;
public ActiveRestoreSession session;
public IRestoreObserver observer;
RestoreGetSetsParams(IBackupTransport _transport, ActiveRestoreSession _session,
IRestoreObserver _observer) {
transport = _transport;
session = _session;
observer = _observer;
}
}
class RestoreParams {
public IBackupTransport transport;
public String dirName;
public IRestoreObserver observer;
public long token;
public PackageInfo pkgInfo;
public int pmToken; // in post-install restore, the PM's token for this transaction
public boolean needFullBackup;
public String[] filterSet;
RestoreParams(IBackupTransport _transport, String _dirName, IRestoreObserver _obs,
long _token, PackageInfo _pkg, int _pmToken, boolean _needFullBackup) {
transport = _transport;
dirName = _dirName;
observer = _obs;
token = _token;
pkgInfo = _pkg;
pmToken = _pmToken;
needFullBackup = _needFullBackup;
filterSet = null;
}
RestoreParams(IBackupTransport _transport, String _dirName, IRestoreObserver _obs,
long _token, boolean _needFullBackup) {
transport = _transport;
dirName = _dirName;
observer = _obs;
token = _token;
pkgInfo = null;
pmToken = 0;
needFullBackup = _needFullBackup;
filterSet = null;
}
RestoreParams(IBackupTransport _transport, String _dirName, IRestoreObserver _obs,
long _token, String[] _filterSet, boolean _needFullBackup) {
transport = _transport;
dirName = _dirName;
observer = _obs;
token = _token;
pkgInfo = null;
pmToken = 0;
needFullBackup = _needFullBackup;
filterSet = _filterSet;
}
}
class ClearParams {
public IBackupTransport transport;
public PackageInfo packageInfo;
ClearParams(IBackupTransport _transport, PackageInfo _info) {
transport = _transport;
packageInfo = _info;
}
}
class ClearRetryParams {
public String transportName;
public String packageName;
ClearRetryParams(String transport, String pkg) {
transportName = transport;
packageName = pkg;
}
}
class FullParams {
public ParcelFileDescriptor fd;
public final AtomicBoolean latch;
public IFullBackupRestoreObserver observer;
public String curPassword; // filled in by the confirmation step
public String encryptPassword;
FullParams() {
latch = new AtomicBoolean(false);
}
}
class FullBackupParams extends FullParams {
public boolean includeApks;
public boolean includeObbs;
public boolean includeShared;
public boolean allApps;
public boolean includeSystem;
public String[] packages;
FullBackupParams(ParcelFileDescriptor output, boolean saveApks, boolean saveObbs,
boolean saveShared, boolean doAllApps, boolean doSystem, String[] pkgList) {
fd = output;
includeApks = saveApks;
includeObbs = saveObbs;
includeShared = saveShared;
allApps = doAllApps;
includeSystem = doSystem;
packages = pkgList;
}
}
class FullRestoreParams extends FullParams {
FullRestoreParams(ParcelFileDescriptor input) {
fd = input;
}
}
// Bookkeeping of in-flight operations for timeout etc. purposes. The operation
// token is the index of the entry in the pending-operations list.
static final int OP_PENDING = 0;
static final int OP_ACKNOWLEDGED = 1;
static final int OP_TIMEOUT = -1;
class Operation {
public int state;
public BackupRestoreTask callback;
Operation(int initialState, BackupRestoreTask callbackObj) {
state = initialState;
callback = callbackObj;
}
}
final SparseArray<Operation> mCurrentOperations = new SparseArray<Operation>();
final Object mCurrentOpLock = new Object();
final Random mTokenGenerator = new Random();
final SparseArray<FullParams> mFullConfirmations = new SparseArray<FullParams>();
// Where we keep our journal files and other bookkeeping
File mBaseStateDir;
File mDataDir;
File mJournalDir;
File mJournal;
// Backup password, if any, and the file where it's saved. What is stored is not the
// password text itself; it's the result of a PBKDF2 hash with a randomly chosen (but
// persisted) salt. Validation is performed by running the challenge text through the
// same PBKDF2 cycle with the persisted salt; if the resulting derived key string matches
// the saved hash string, then the challenge text matches the originally supplied
// password text.
private final SecureRandom mRng = new SecureRandom();
private String mPasswordHash;
private File mPasswordHashFile;
private int mPasswordVersion;
private File mPasswordVersionFile;
private byte[] mPasswordSalt;
// Configuration of PBKDF2 that we use for generating pw hashes and intermediate keys
static final int PBKDF2_HASH_ROUNDS = 10000;
static final int PBKDF2_KEY_SIZE = 256; // bits
static final int PBKDF2_SALT_SIZE = 512; // bits
static final String ENCRYPTION_ALGORITHM_NAME = "AES-256";
// Keep a log of all the apps we've ever backed up, and what the
// dataset tokens are for both the current backup dataset and
// the ancestral dataset.
private File mEverStored;
HashSet<String> mEverStoredApps = new HashSet<String>();
static final int CURRENT_ANCESTRAL_RECORD_VERSION = 1; // increment when the schema changes
File mTokenFile;
Set<String> mAncestralPackages = null;
long mAncestralToken = 0;
long mCurrentToken = 0;
// Persistently track the need to do a full init
static final String INIT_SENTINEL_FILE_NAME = "_need_init_";
HashSet<String> mPendingInits = new HashSet<String>(); // transport names
// Utility: build a new random integer token
int generateToken() {
int token;
do {
synchronized (mTokenGenerator) {
token = mTokenGenerator.nextInt();
}
} while (token < 0);
return token;
}
// ----- Asynchronous backup/restore handler thread -----
private class BackupHandler extends Handler {
public BackupHandler(Looper looper) {
super(looper);
}
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_RUN_BACKUP:
{
mLastBackupPass = System.currentTimeMillis();
mNextBackupPass = mLastBackupPass + BACKUP_INTERVAL;
IBackupTransport transport = getTransport(mCurrentTransport);
if (transport == null) {
Slog.v(TAG, "Backup requested but no transport available");
synchronized (mQueueLock) {
mBackupRunning = false;
}
mWakelock.release();
break;
}
// snapshot the pending-backup set and work on that
ArrayList<BackupRequest> queue = new ArrayList<BackupRequest>();
File oldJournal = mJournal;
synchronized (mQueueLock) {
// Do we have any work to do? Construct the work queue
// then release the synchronization lock to actually run
// the backup.
if (mPendingBackups.size() > 0) {
for (BackupRequest b: mPendingBackups.values()) {
queue.add(b);
}
if (DEBUG) Slog.v(TAG, "clearing pending backups");
mPendingBackups.clear();
// Start a new backup-queue journal file too
mJournal = null;
}
}
// At this point, we have started a new journal file, and the old
// file identity is being passed to the backup processing task.
// When it completes successfully, that old journal file will be
// deleted. If we crash prior to that, the old journal is parsed
// at next boot and the journaled requests fulfilled.
boolean staged = true;
if (queue.size() > 0) {
// Spin up a backup state sequence and set it running
try {
String dirName = transport.transportDirName();
PerformBackupTask pbt = new PerformBackupTask(transport, dirName,
queue, oldJournal);
Message pbtMessage = obtainMessage(MSG_BACKUP_RESTORE_STEP, pbt);
sendMessage(pbtMessage);
} catch (RemoteException e) {
// unable to ask the transport its dir name -- transient failure, since
// the above check succeeded. Try again next time.
Slog.e(TAG, "Transport became unavailable attempting backup");
staged = false;
}
} else {
Slog.v(TAG, "Backup requested but nothing pending");
staged = false;
}
if (!staged) {
// if we didn't actually hand off the wakelock, rewind until next time
synchronized (mQueueLock) {
mBackupRunning = false;
}
mWakelock.release();
}
break;
}
case MSG_BACKUP_RESTORE_STEP:
{
try {
BackupRestoreTask task = (BackupRestoreTask) msg.obj;
if (MORE_DEBUG) Slog.v(TAG, "Got next step for " + task + ", executing");
task.execute();
} catch (ClassCastException e) {
Slog.e(TAG, "Invalid backup task in flight, obj=" + msg.obj);
}
break;
}
case MSG_OP_COMPLETE:
{
try {
BackupRestoreTask task = (BackupRestoreTask) msg.obj;
task.operationComplete();
} catch (ClassCastException e) {
Slog.e(TAG, "Invalid completion in flight, obj=" + msg.obj);
}
break;
}
case MSG_RUN_FULL_BACKUP:
{
// TODO: refactor full backup to be a looper-based state machine
// similar to normal backup/restore.
FullBackupParams params = (FullBackupParams)msg.obj;
PerformFullBackupTask task = new PerformFullBackupTask(params.fd,
params.observer, params.includeApks, params.includeObbs,
params.includeShared, params.curPassword, params.encryptPassword,
params.allApps, params.includeSystem, params.packages, params.latch);
(new Thread(task)).start();
break;
}
case MSG_RUN_RESTORE:
{
RestoreParams params = (RestoreParams)msg.obj;
Slog.d(TAG, "MSG_RUN_RESTORE observer=" + params.observer);
PerformRestoreTask task = new PerformRestoreTask(
params.transport, params.dirName, params.observer,
params.token, params.pkgInfo, params.pmToken,
params.needFullBackup, params.filterSet);
Message restoreMsg = obtainMessage(MSG_BACKUP_RESTORE_STEP, task);
sendMessage(restoreMsg);
break;
}
case MSG_RUN_FULL_RESTORE:
{
// TODO: refactor full restore to be a looper-based state machine
// similar to normal backup/restore.
FullRestoreParams params = (FullRestoreParams)msg.obj;
PerformFullRestoreTask task = new PerformFullRestoreTask(params.fd,
params.curPassword, params.encryptPassword,
params.observer, params.latch);
(new Thread(task)).start();
break;
}
case MSG_RUN_CLEAR:
{
ClearParams params = (ClearParams)msg.obj;
(new PerformClearTask(params.transport, params.packageInfo)).run();
break;
}
case MSG_RETRY_CLEAR:
{
// reenqueues if the transport remains unavailable
ClearRetryParams params = (ClearRetryParams)msg.obj;
clearBackupData(params.transportName, params.packageName);
break;
}
case MSG_RUN_INITIALIZE:
{
HashSet<String> queue;
// Snapshot the pending-init queue and work on that
synchronized (mQueueLock) {
queue = new HashSet<String>(mPendingInits);
mPendingInits.clear();
}
(new PerformInitializeTask(queue)).run();
break;
}
case MSG_RETRY_INIT:
{
synchronized (mQueueLock) {
recordInitPendingLocked(msg.arg1 != 0, (String)msg.obj);
mAlarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
mRunInitIntent);
}
break;
}
case MSG_RUN_GET_RESTORE_SETS:
{
// Like other async operations, this is entered with the wakelock held
RestoreSet[] sets = null;
RestoreGetSetsParams params = (RestoreGetSetsParams)msg.obj;
try {
sets = params.transport.getAvailableRestoreSets();
// cache the result in the active session
synchronized (params.session) {
params.session.mRestoreSets = sets;
}
if (sets == null) EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
} catch (Exception e) {
Slog.e(TAG, "Error from transport getting set list");
} finally {
if (params.observer != null) {
try {
params.observer.restoreSetsAvailable(sets);
} catch (RemoteException re) {
Slog.e(TAG, "Unable to report listing to observer");
} catch (Exception e) {
Slog.e(TAG, "Restore observer threw", e);
}
}
// Done: reset the session timeout clock
removeMessages(MSG_RESTORE_TIMEOUT);
sendEmptyMessageDelayed(MSG_RESTORE_TIMEOUT, TIMEOUT_RESTORE_INTERVAL);
mWakelock.release();
}
break;
}
case MSG_TIMEOUT:
{
handleTimeout(msg.arg1, msg.obj);
break;
}
case MSG_RESTORE_TIMEOUT:
{
synchronized (BackupManagerService.this) {
if (mActiveRestoreSession != null) {
// Client app left the restore session dangling. We know that it
// can't be in the middle of an actual restore operation because
// the timeout is suspended while a restore is in progress. Clean
// up now.
Slog.w(TAG, "Restore session timed out; aborting");
post(mActiveRestoreSession.new EndRestoreRunnable(
BackupManagerService.this, mActiveRestoreSession));
}
}
}
case MSG_FULL_CONFIRMATION_TIMEOUT:
{
synchronized (mFullConfirmations) {
FullParams params = mFullConfirmations.get(msg.arg1);
if (params != null) {
Slog.i(TAG, "Full backup/restore timed out waiting for user confirmation");
// Release the waiter; timeout == completion
signalFullBackupRestoreCompletion(params);
// Remove the token from the set
mFullConfirmations.delete(msg.arg1);
// Report a timeout to the observer, if any
if (params.observer != null) {
try {
params.observer.onTimeout();
} catch (RemoteException e) {
/* don't care if the app has gone away */
}
}
} else {
Slog.d(TAG, "couldn't find params for token " + msg.arg1);
}
}
break;
}
}
}
}
// ----- Debug-only backup operation trace -----
void addBackupTrace(String s) {
if (DEBUG_BACKUP_TRACE) {
synchronized (mBackupTrace) {
mBackupTrace.add(s);
}
}
}
void clearBackupTrace() {
if (DEBUG_BACKUP_TRACE) {
synchronized (mBackupTrace) {
mBackupTrace.clear();
}
}
}
// ----- Main service implementation -----
public BackupManagerService(Context context) {
mContext = context;
mPackageManager = context.getPackageManager();
mPackageManagerBinder = AppGlobals.getPackageManager();
mActivityManager = ActivityManagerNative.getDefault();
mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
mPowerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
mMountService = IMountService.Stub.asInterface(ServiceManager.getService("mount"));
mBackupManagerBinder = asInterface(asBinder());
// spin up the backup/restore handler thread
mHandlerThread = new HandlerThread("backup", Process.THREAD_PRIORITY_BACKGROUND);
mHandlerThread.start();
mBackupHandler = new BackupHandler(mHandlerThread.getLooper());
// Set up our bookkeeping
final ContentResolver resolver = context.getContentResolver();
boolean areEnabled = Settings.Secure.getInt(resolver,
Settings.Secure.BACKUP_ENABLED, 0) != 0;
mProvisioned = Settings.Global.getInt(resolver,
Settings.Global.DEVICE_PROVISIONED, 0) != 0;
mAutoRestore = Settings.Secure.getInt(resolver,
Settings.Secure.BACKUP_AUTO_RESTORE, 1) != 0;
mProvisionedObserver = new ProvisionedObserver(mBackupHandler);
resolver.registerContentObserver(
Settings.Global.getUriFor(Settings.Global.DEVICE_PROVISIONED),
false, mProvisionedObserver);
// If Encrypted file systems is enabled or disabled, this call will return the
// correct directory.
mBaseStateDir = new File(Environment.getSecureDataDirectory(), "backup");
mBaseStateDir.mkdirs();
if (!SELinux.restorecon(mBaseStateDir)) {
Slog.e(TAG, "SELinux restorecon failed on " + mBaseStateDir);
}
mDataDir = Environment.getDownloadCacheDirectory();
mPasswordVersion = 1; // unless we hear otherwise
mPasswordVersionFile = new File(mBaseStateDir, "pwversion");
if (mPasswordVersionFile.exists()) {
FileInputStream fin = null;
DataInputStream in = null;
try {
fin = new FileInputStream(mPasswordVersionFile);
in = new DataInputStream(fin);
mPasswordVersion = in.readInt();
} catch (IOException e) {
Slog.e(TAG, "Unable to read backup pw version");
} finally {
try {
if (in != null) in.close();
if (fin != null) fin.close();
} catch (IOException e) {
Slog.w(TAG, "Error closing pw version files");
}
}
}
mPasswordHashFile = new File(mBaseStateDir, "pwhash");
if (mPasswordHashFile.exists()) {
FileInputStream fin = null;
DataInputStream in = null;
try {
fin = new FileInputStream(mPasswordHashFile);
in = new DataInputStream(new BufferedInputStream(fin));
// integer length of the salt array, followed by the salt,
// then the hex pw hash string
int saltLen = in.readInt();
byte[] salt = new byte[saltLen];
in.readFully(salt);
mPasswordHash = in.readUTF();
mPasswordSalt = salt;
} catch (IOException e) {
Slog.e(TAG, "Unable to read saved backup pw hash");
} finally {
try {
if (in != null) in.close();
if (fin != null) fin.close();
} catch (IOException e) {
Slog.w(TAG, "Unable to close streams");
}
}
}
// Alarm receivers for scheduled backups & initialization operations
mRunBackupReceiver = new RunBackupReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction(RUN_BACKUP_ACTION);
context.registerReceiver(mRunBackupReceiver, filter,
android.Manifest.permission.BACKUP, null);
mRunInitReceiver = new RunInitializeReceiver();
filter = new IntentFilter();
filter.addAction(RUN_INITIALIZE_ACTION);
context.registerReceiver(mRunInitReceiver, filter,
android.Manifest.permission.BACKUP, null);
Intent backupIntent = new Intent(RUN_BACKUP_ACTION);
backupIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mRunBackupIntent = PendingIntent.getBroadcast(context, MSG_RUN_BACKUP, backupIntent, 0);
Intent initIntent = new Intent(RUN_INITIALIZE_ACTION);
backupIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
mRunInitIntent = PendingIntent.getBroadcast(context, MSG_RUN_INITIALIZE, initIntent, 0);
// Set up the backup-request journaling
mJournalDir = new File(mBaseStateDir, "pending");
mJournalDir.mkdirs(); // creates mBaseStateDir along the way
mJournal = null; // will be created on first use
// Set up the various sorts of package tracking we do
initPackageTracking();
// Build our mapping of uid to backup client services. This implicitly
// schedules a backup pass on the Package Manager metadata the first
// time anything needs to be backed up.
synchronized (mBackupParticipants) {
addPackageParticipantsLocked(null);
}
// Set up our transport options and initialize the default transport
// TODO: Don't create transports that we don't need to?
mCurrentTransport = Settings.Secure.getString(context.getContentResolver(),
Settings.Secure.BACKUP_TRANSPORT);
if ("".equals(mCurrentTransport)) {
mCurrentTransport = null;
}
if (DEBUG) Slog.v(TAG, "Starting with transport " + mCurrentTransport);
// Find transport hosts and bind to their services
Intent transportServiceIntent = new Intent(SERVICE_ACTION_TRANSPORT_HOST);
List<ResolveInfo> hosts = mPackageManager.queryIntentServicesAsUser(
transportServiceIntent, 0, UserHandle.USER_OWNER);
if (DEBUG) {
Slog.v(TAG, "Found transports: " + ((hosts == null) ? "null" : hosts.size()));
}
if (hosts != null) {
if (MORE_DEBUG) {
for (int i = 0; i < hosts.size(); i++) {
ServiceInfo info = hosts.get(i).serviceInfo;
Slog.v(TAG, " " + info.packageName + "/" + info.name);
}
}
for (int i = 0; i < hosts.size(); i++) {
try {
ServiceInfo info = hosts.get(i).serviceInfo;
PackageInfo packInfo = mPackageManager.getPackageInfo(info.packageName, 0);
if ((packInfo.applicationInfo.flags & ApplicationInfo.FLAG_PRIVILEGED) != 0) {
ComponentName svcName = new ComponentName(info.packageName, info.name);
if (DEBUG) {
Slog.i(TAG, "Binding to transport host " + svcName);
}
Intent intent = new Intent(transportServiceIntent);
intent.setComponent(svcName);
TransportConnection connection = new TransportConnection();
mTransportConnections.add(connection);
context.bindServiceAsUser(intent,
connection, Context.BIND_AUTO_CREATE,
UserHandle.OWNER);
} else {
Slog.w(TAG, "Transport package not privileged: " + info.packageName);
}
} catch (Exception e) {
Slog.e(TAG, "Problem resolving transport service: " + e.getMessage());
}
}
}
// Now that we know about valid backup participants, parse any
// leftover journal files into the pending backup set
parseLeftoverJournals();
// Power management
mWakelock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*backup*");
// Start the backup passes going
setBackupEnabled(areEnabled);
}
private class RunBackupReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (RUN_BACKUP_ACTION.equals(intent.getAction())) {
synchronized (mQueueLock) {
if (mPendingInits.size() > 0) {
// If there are pending init operations, we process those
// and then settle into the usual periodic backup schedule.
if (DEBUG) Slog.v(TAG, "Init pending at scheduled backup");
try {
mAlarmManager.cancel(mRunInitIntent);
mRunInitIntent.send();
} catch (PendingIntent.CanceledException ce) {
Slog.e(TAG, "Run init intent cancelled");
// can't really do more than bail here
}
} else {
// Don't run backups now if we're disabled or not yet
// fully set up.
if (mEnabled && mProvisioned) {
if (!mBackupRunning) {
if (DEBUG) Slog.v(TAG, "Running a backup pass");
// Acquire the wakelock and pass it to the backup thread. it will
// be released once backup concludes.
mBackupRunning = true;
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_BACKUP);
mBackupHandler.sendMessage(msg);
} else {
Slog.i(TAG, "Backup time but one already running");
}
} else {
Slog.w(TAG, "Backup pass but e=" + mEnabled + " p=" + mProvisioned);
}
}
}
}
}
}
private class RunInitializeReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
if (RUN_INITIALIZE_ACTION.equals(intent.getAction())) {
synchronized (mQueueLock) {
if (DEBUG) Slog.v(TAG, "Running a device init");
// Acquire the wakelock and pass it to the init thread. it will
// be released once init concludes.
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_INITIALIZE);
mBackupHandler.sendMessage(msg);
}
}
}
}
private void initPackageTracking() {
if (DEBUG) Slog.v(TAG, "Initializing package tracking");
// Remember our ancestral dataset
mTokenFile = new File(mBaseStateDir, "ancestral");
try {
RandomAccessFile tf = new RandomAccessFile(mTokenFile, "r");
int version = tf.readInt();
if (version == CURRENT_ANCESTRAL_RECORD_VERSION) {
mAncestralToken = tf.readLong();
mCurrentToken = tf.readLong();
int numPackages = tf.readInt();
if (numPackages >= 0) {
mAncestralPackages = new HashSet<String>();
for (int i = 0; i < numPackages; i++) {
String pkgName = tf.readUTF();
mAncestralPackages.add(pkgName);
}
}
}
tf.close();
} catch (FileNotFoundException fnf) {
// Probably innocuous
Slog.v(TAG, "No ancestral data");
} catch (IOException e) {
Slog.w(TAG, "Unable to read token file", e);
}
// Keep a log of what apps we've ever backed up. Because we might have
// rebooted in the middle of an operation that was removing something from
// this log, we sanity-check its contents here and reconstruct it.
mEverStored = new File(mBaseStateDir, "processed");
File tempProcessedFile = new File(mBaseStateDir, "processed.new");
// If we were in the middle of removing something from the ever-backed-up
// file, there might be a transient "processed.new" file still present.
// Ignore it -- we'll validate "processed" against the current package set.
if (tempProcessedFile.exists()) {
tempProcessedFile.delete();
}
// If there are previous contents, parse them out then start a new
// file to continue the recordkeeping.
if (mEverStored.exists()) {
RandomAccessFile temp = null;
RandomAccessFile in = null;
try {
temp = new RandomAccessFile(tempProcessedFile, "rws");
in = new RandomAccessFile(mEverStored, "r");
while (true) {
PackageInfo info;
String pkg = in.readUTF();
try {
info = mPackageManager.getPackageInfo(pkg, 0);
mEverStoredApps.add(pkg);
temp.writeUTF(pkg);
if (MORE_DEBUG) Slog.v(TAG, " + " + pkg);
} catch (NameNotFoundException e) {
// nope, this package was uninstalled; don't include it
if (MORE_DEBUG) Slog.v(TAG, " - " + pkg);
}
}
} catch (EOFException e) {
// Once we've rewritten the backup history log, atomically replace the
// old one with the new one then reopen the file for continuing use.
if (!tempProcessedFile.renameTo(mEverStored)) {
Slog.e(TAG, "Error renaming " + tempProcessedFile + " to " + mEverStored);
}
} catch (IOException e) {
Slog.e(TAG, "Error in processed file", e);
} finally {
try { if (temp != null) temp.close(); } catch (IOException e) {}
try { if (in != null) in.close(); } catch (IOException e) {}
}
}
// Register for broadcasts about package install, etc., so we can
// update the provider list.
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_PACKAGE_ADDED);
filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
filter.addDataScheme("package");
mContext.registerReceiver(mBroadcastReceiver, filter);
// Register for events related to sdcard installation.
IntentFilter sdFilter = new IntentFilter();
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
mContext.registerReceiver(mBroadcastReceiver, sdFilter);
}
private void parseLeftoverJournals() {
for (File f : mJournalDir.listFiles()) {
if (mJournal == null || f.compareTo(mJournal) != 0) {
// This isn't the current journal, so it must be a leftover. Read
// out the package names mentioned there and schedule them for
// backup.
RandomAccessFile in = null;
try {
Slog.i(TAG, "Found stale backup journal, scheduling");
in = new RandomAccessFile(f, "r");
while (true) {
String packageName = in.readUTF();
Slog.i(TAG, " " + packageName);
dataChangedImpl(packageName);
}
} catch (EOFException e) {
// no more data; we're done
} catch (Exception e) {
Slog.e(TAG, "Can't read " + f, e);
} finally {
// close/delete the file
try { if (in != null) in.close(); } catch (IOException e) {}
f.delete();
}
}
}
}
private SecretKey buildPasswordKey(String algorithm, String pw, byte[] salt, int rounds) {
return buildCharArrayKey(algorithm, pw.toCharArray(), salt, rounds);
}
private SecretKey buildCharArrayKey(String algorithm, char[] pwArray, byte[] salt, int rounds) {
try {
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(algorithm);
KeySpec ks = new PBEKeySpec(pwArray, salt, rounds, PBKDF2_KEY_SIZE);
return keyFactory.generateSecret(ks);
} catch (InvalidKeySpecException e) {
Slog.e(TAG, "Invalid key spec for PBKDF2!");
} catch (NoSuchAlgorithmException e) {
Slog.e(TAG, "PBKDF2 unavailable!");
}
return null;
}
private String buildPasswordHash(String algorithm, String pw, byte[] salt, int rounds) {
SecretKey key = buildPasswordKey(algorithm, pw, salt, rounds);
if (key != null) {
return byteArrayToHex(key.getEncoded());
}
return null;
}
private String byteArrayToHex(byte[] data) {
StringBuilder buf = new StringBuilder(data.length * 2);
for (int i = 0; i < data.length; i++) {
buf.append(Byte.toHexString(data[i], true));
}
return buf.toString();
}
private byte[] hexToByteArray(String digits) {
final int bytes = digits.length() / 2;
if (2*bytes != digits.length()) {
throw new IllegalArgumentException("Hex string must have an even number of digits");
}
byte[] result = new byte[bytes];
for (int i = 0; i < digits.length(); i += 2) {
result[i/2] = (byte) Integer.parseInt(digits.substring(i, i+2), 16);
}
return result;
}
private byte[] makeKeyChecksum(String algorithm, byte[] pwBytes, byte[] salt, int rounds) {
char[] mkAsChar = new char[pwBytes.length];
for (int i = 0; i < pwBytes.length; i++) {
mkAsChar[i] = (char) pwBytes[i];
}
Key checksum = buildCharArrayKey(algorithm, mkAsChar, salt, rounds);
return checksum.getEncoded();
}
// Used for generating random salts or passwords
private byte[] randomBytes(int bits) {
byte[] array = new byte[bits / 8];
mRng.nextBytes(array);
return array;
}
// Backup password management
boolean passwordMatchesSaved(String algorithm, String candidatePw, int rounds) {
// First, on an encrypted device we require matching the device pw
final boolean isEncrypted;
try {
isEncrypted = (mMountService.getEncryptionState() != MountService.ENCRYPTION_STATE_NONE);
if (isEncrypted) {
if (DEBUG) {
Slog.i(TAG, "Device encrypted; verifying against device data pw");
}
// 0 means the password validated
// -2 means device not encrypted
// Any other result is either password failure or an error condition,
// so we refuse the match
final int result = mMountService.verifyEncryptionPassword(candidatePw);
if (result == 0) {
if (MORE_DEBUG) Slog.d(TAG, "Pw verifies");
return true;
} else if (result != -2) {
if (MORE_DEBUG) Slog.d(TAG, "Pw mismatch");
return false;
} else {
// ...else the device is supposedly not encrypted. HOWEVER, the
// query about the encryption state said that the device *is*
// encrypted, so ... we may have a problem. Log it and refuse
// the backup.
Slog.e(TAG, "verified encryption state mismatch against query; no match allowed");
return false;
}
}
} catch (Exception e) {
// Something went wrong talking to the mount service. This is very bad;
// assume that we fail password validation.
return false;
}
if (mPasswordHash == null) {
// no current password case -- require that 'currentPw' be null or empty
if (candidatePw == null || "".equals(candidatePw)) {
return true;
} // else the non-empty candidate does not match the empty stored pw
} else {
// hash the stated current pw and compare to the stored one
if (candidatePw != null && candidatePw.length() > 0) {
String currentPwHash = buildPasswordHash(algorithm, candidatePw, mPasswordSalt, rounds);
if (mPasswordHash.equalsIgnoreCase(currentPwHash)) {
// candidate hash matches the stored hash -- the password matches
return true;
}
} // else the stored pw is nonempty but the candidate is empty; no match
}
return false;
}
@Override
public boolean setBackupPassword(String currentPw, String newPw) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupPassword");
// When processing v1 passwords we may need to try two different PBKDF2 checksum regimes
final boolean pbkdf2Fallback = (mPasswordVersion < BACKUP_PW_FILE_VERSION);
// If the supplied pw doesn't hash to the the saved one, fail. The password
// might be caught in the legacy crypto mismatch; verify that too.
if (!passwordMatchesSaved(PBKDF_CURRENT, currentPw, PBKDF2_HASH_ROUNDS)
&& !(pbkdf2Fallback && passwordMatchesSaved(PBKDF_FALLBACK,
currentPw, PBKDF2_HASH_ROUNDS))) {
return false;
}
// Snap up to current on the pw file version
mPasswordVersion = BACKUP_PW_FILE_VERSION;
FileOutputStream pwFout = null;
DataOutputStream pwOut = null;
try {
pwFout = new FileOutputStream(mPasswordVersionFile);
pwOut = new DataOutputStream(pwFout);
pwOut.writeInt(mPasswordVersion);
} catch (IOException e) {
Slog.e(TAG, "Unable to write backup pw version; password not changed");
return false;
} finally {
try {
if (pwOut != null) pwOut.close();
if (pwFout != null) pwFout.close();
} catch (IOException e) {
Slog.w(TAG, "Unable to close pw version record");
}
}
// Clearing the password is okay
if (newPw == null || newPw.isEmpty()) {
if (mPasswordHashFile.exists()) {
if (!mPasswordHashFile.delete()) {
// Unable to delete the old pw file, so fail
Slog.e(TAG, "Unable to clear backup password");
return false;
}
}
mPasswordHash = null;
mPasswordSalt = null;
return true;
}
try {
// Okay, build the hash of the new backup password
byte[] salt = randomBytes(PBKDF2_SALT_SIZE);
String newPwHash = buildPasswordHash(PBKDF_CURRENT, newPw, salt, PBKDF2_HASH_ROUNDS);
OutputStream pwf = null, buffer = null;
DataOutputStream out = null;
try {
pwf = new FileOutputStream(mPasswordHashFile);
buffer = new BufferedOutputStream(pwf);
out = new DataOutputStream(buffer);
// integer length of the salt array, followed by the salt,
// then the hex pw hash string
out.writeInt(salt.length);
out.write(salt);
out.writeUTF(newPwHash);
out.flush();
mPasswordHash = newPwHash;
mPasswordSalt = salt;
return true;
} finally {
if (out != null) out.close();
if (buffer != null) buffer.close();
if (pwf != null) pwf.close();
}
} catch (IOException e) {
Slog.e(TAG, "Unable to set backup password");
}
return false;
}
@Override
public boolean hasBackupPassword() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"hasBackupPassword");
try {
return (mMountService.getEncryptionState() != IMountService.ENCRYPTION_STATE_NONE)
|| (mPasswordHash != null && mPasswordHash.length() > 0);
} catch (Exception e) {
// If we can't talk to the mount service we have a serious problem; fail
// "secure" i.e. assuming that we require a password
return true;
}
}
private boolean backupPasswordMatches(String currentPw) {
if (hasBackupPassword()) {
final boolean pbkdf2Fallback = (mPasswordVersion < BACKUP_PW_FILE_VERSION);
if (!passwordMatchesSaved(PBKDF_CURRENT, currentPw, PBKDF2_HASH_ROUNDS)
&& !(pbkdf2Fallback && passwordMatchesSaved(PBKDF_FALLBACK,
currentPw, PBKDF2_HASH_ROUNDS))) {
if (DEBUG) Slog.w(TAG, "Backup password mismatch; aborting");
return false;
}
}
return true;
}
// Maintain persistent state around whether need to do an initialize operation.
// Must be called with the queue lock held.
void recordInitPendingLocked(boolean isPending, String transportName) {
if (DEBUG) Slog.i(TAG, "recordInitPendingLocked: " + isPending
+ " on transport " + transportName);
mBackupHandler.removeMessages(MSG_RETRY_INIT);
try {
IBackupTransport transport = getTransport(transportName);
if (transport != null) {
String transportDirName = transport.transportDirName();
File stateDir = new File(mBaseStateDir, transportDirName);
File initPendingFile = new File(stateDir, INIT_SENTINEL_FILE_NAME);
if (isPending) {
// We need an init before we can proceed with sending backup data.
// Record that with an entry in our set of pending inits, as well as
// journaling it via creation of a sentinel file.
mPendingInits.add(transportName);
try {
(new FileOutputStream(initPendingFile)).close();
} catch (IOException ioe) {
// Something is badly wrong with our permissions; just try to move on
}
} else {
// No more initialization needed; wipe the journal and reset our state.
initPendingFile.delete();
mPendingInits.remove(transportName);
}
return; // done; don't fall through to the error case
}
} catch (RemoteException e) {
// transport threw when asked its name; fall through to the lookup-failed case
}
// The named transport doesn't exist or threw. This operation is
// important, so we record the need for a an init and post a message
// to retry the init later.
if (isPending) {
mPendingInits.add(transportName);
mBackupHandler.sendMessageDelayed(
mBackupHandler.obtainMessage(MSG_RETRY_INIT,
(isPending ? 1 : 0),
0,
transportName),
TRANSPORT_RETRY_INTERVAL);
}
}
// Reset all of our bookkeeping, in response to having been told that
// the backend data has been wiped [due to idle expiry, for example],
// so we must re-upload all saved settings.
void resetBackupState(File stateFileDir) {
synchronized (mQueueLock) {
// Wipe the "what we've ever backed up" tracking
mEverStoredApps.clear();
mEverStored.delete();
mCurrentToken = 0;
writeRestoreTokens();
// Remove all the state files
for (File sf : stateFileDir.listFiles()) {
// ... but don't touch the needs-init sentinel
if (!sf.getName().equals(INIT_SENTINEL_FILE_NAME)) {
sf.delete();
}
}
}
// Enqueue a new backup of every participant
synchronized (mBackupParticipants) {
final int N = mBackupParticipants.size();
for (int i=0; i<N; i++) {
HashSet<String> participants = mBackupParticipants.valueAt(i);
if (participants != null) {
for (String packageName : participants) {
dataChangedImpl(packageName);
}
}
}
}
}
// Add a transport to our set of available backends. If 'transport' is null, this
// is an unregistration, and the transport's entry is removed from our bookkeeping.
private void registerTransport(String name, String component, IBackupTransport transport) {
synchronized (mTransports) {
if (DEBUG) Slog.v(TAG, "Registering transport "
+ component + "::" + name + " = " + transport);
if (transport != null) {
mTransports.put(name, transport);
mTransportNames.put(component, name);
} else {
mTransports.remove(mTransportNames.get(component));
mTransportNames.remove(component);
// Nothing further to do in the unregistration case
return;
}
}
// If the init sentinel file exists, we need to be sure to perform the init
// as soon as practical. We also create the state directory at registration
// time to ensure it's present from the outset.
try {
String transportName = transport.transportDirName();
File stateDir = new File(mBaseStateDir, transportName);
stateDir.mkdirs();
File initSentinel = new File(stateDir, INIT_SENTINEL_FILE_NAME);
if (initSentinel.exists()) {
synchronized (mQueueLock) {
mPendingInits.add(transportName);
// TODO: pick a better starting time than now + 1 minute
long delay = 1000 * 60; // one minute, in milliseconds
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + delay, mRunInitIntent);
}
}
} catch (RemoteException e) {
// the transport threw when asked its file naming prefs; declare it invalid
Slog.e(TAG, "Unable to register transport as " + name);
mTransportNames.remove(component);
mTransports.remove(name);
}
}
// ----- Track installation/removal of packages -----
BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
if (DEBUG) Slog.d(TAG, "Received broadcast " + intent);
String action = intent.getAction();
boolean replacing = false;
boolean added = false;
Bundle extras = intent.getExtras();
String pkgList[] = null;
if (Intent.ACTION_PACKAGE_ADDED.equals(action) ||
Intent.ACTION_PACKAGE_REMOVED.equals(action)) {
Uri uri = intent.getData();
if (uri == null) {
return;
}
String pkgName = uri.getSchemeSpecificPart();
if (pkgName != null) {
pkgList = new String[] { pkgName };
}
added = Intent.ACTION_PACKAGE_ADDED.equals(action);
replacing = extras.getBoolean(Intent.EXTRA_REPLACING, false);
} else if (Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE.equals(action)) {
added = true;
pkgList = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
} else if (Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action)) {
added = false;
pkgList = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
}
if (pkgList == null || pkgList.length == 0) {
return;
}
final int uid = extras.getInt(Intent.EXTRA_UID);
if (added) {
synchronized (mBackupParticipants) {
if (replacing) {
// This is the package-replaced case; we just remove the entry
// under the old uid and fall through to re-add.
removePackageParticipantsLocked(pkgList, uid);
}
addPackageParticipantsLocked(pkgList);
}
} else {
if (replacing) {
// The package is being updated. We'll receive a PACKAGE_ADDED shortly.
} else {
synchronized (mBackupParticipants) {
removePackageParticipantsLocked(pkgList, uid);
}
}
}
}
};
// ----- Track connection to transports service -----
class TransportConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName component, IBinder service) {
if (DEBUG) Slog.v(TAG, "Connected to transport " + component);
try {
IBackupTransport transport = IBackupTransport.Stub.asInterface(service);
registerTransport(transport.name(), component.flattenToShortString(), transport);
} catch (RemoteException e) {
Slog.e(TAG, "Unable to register transport " + component);
}
}
@Override
public void onServiceDisconnected(ComponentName component) {
if (DEBUG) Slog.v(TAG, "Disconnected from transport " + component);
registerTransport(null, component.flattenToShortString(), null);
}
};
// Add the backup agents in the given packages to our set of known backup participants.
// If 'packageNames' is null, adds all backup agents in the whole system.
void addPackageParticipantsLocked(String[] packageNames) {
// Look for apps that define the android:backupAgent attribute
List<PackageInfo> targetApps = allAgentPackages();
if (packageNames != null) {
if (DEBUG) Slog.v(TAG, "addPackageParticipantsLocked: #" + packageNames.length);
for (String packageName : packageNames) {
addPackageParticipantsLockedInner(packageName, targetApps);
}
} else {
if (DEBUG) Slog.v(TAG, "addPackageParticipantsLocked: all");
addPackageParticipantsLockedInner(null, targetApps);
}
}
private void addPackageParticipantsLockedInner(String packageName,
List<PackageInfo> targetPkgs) {
if (MORE_DEBUG) {
Slog.v(TAG, "Examining " + packageName + " for backup agent");
}
for (PackageInfo pkg : targetPkgs) {
if (packageName == null || pkg.packageName.equals(packageName)) {
int uid = pkg.applicationInfo.uid;
HashSet<String> set = mBackupParticipants.get(uid);
if (set == null) {
set = new HashSet<String>();
mBackupParticipants.put(uid, set);
}
set.add(pkg.packageName);
if (MORE_DEBUG) Slog.v(TAG, "Agent found; added");
// Schedule a backup for it on general principles
if (DEBUG) Slog.i(TAG, "Scheduling backup for new app " + pkg.packageName);
dataChangedImpl(pkg.packageName);
}
}
}
// Remove the given packages' entries from our known active set.
void removePackageParticipantsLocked(String[] packageNames, int oldUid) {
if (packageNames == null) {
Slog.w(TAG, "removePackageParticipants with null list");
return;
}
if (DEBUG) Slog.v(TAG, "removePackageParticipantsLocked: uid=" + oldUid
+ " #" + packageNames.length);
for (String pkg : packageNames) {
// Known previous UID, so we know which package set to check
HashSet<String> set = mBackupParticipants.get(oldUid);
if (set != null && set.contains(pkg)) {
removePackageFromSetLocked(set, pkg);
if (set.isEmpty()) {
if (MORE_DEBUG) Slog.v(TAG, " last one of this uid; purging set");
mBackupParticipants.remove(oldUid);
}
}
}
}
private void removePackageFromSetLocked(final HashSet<String> set,
final String packageName) {
if (set.contains(packageName)) {
// Found it. Remove this one package from the bookkeeping, and
// if it's the last participating app under this uid we drop the
// (now-empty) set as well.
// Note that we deliberately leave it 'known' in the "ever backed up"
// bookkeeping so that its current-dataset data will be retrieved
// if the app is subsequently reinstalled
if (MORE_DEBUG) Slog.v(TAG, " removing participant " + packageName);
set.remove(packageName);
mPendingBackups.remove(packageName);
}
}
// Returns the set of all applications that define an android:backupAgent attribute
List<PackageInfo> allAgentPackages() {
// !!! TODO: cache this and regenerate only when necessary
int flags = PackageManager.GET_SIGNATURES;
List<PackageInfo> packages = mPackageManager.getInstalledPackages(flags);
int N = packages.size();
for (int a = N-1; a >= 0; a--) {
PackageInfo pkg = packages.get(a);
try {
ApplicationInfo app = pkg.applicationInfo;
if (((app.flags&ApplicationInfo.FLAG_ALLOW_BACKUP) == 0)
|| app.backupAgentName == null) {
packages.remove(a);
}
else {
// we will need the shared library path, so look that up and store it here
app = mPackageManager.getApplicationInfo(pkg.packageName,
PackageManager.GET_SHARED_LIBRARY_FILES);
pkg.applicationInfo.sharedLibraryFiles = app.sharedLibraryFiles;
}
} catch (NameNotFoundException e) {
packages.remove(a);
}
}
return packages;
}
// Called from the backup task: record that the given app has been successfully
// backed up at least once
void logBackupComplete(String packageName) {
if (packageName.equals(PACKAGE_MANAGER_SENTINEL)) return;
synchronized (mEverStoredApps) {
if (!mEverStoredApps.add(packageName)) return;
RandomAccessFile out = null;
try {
out = new RandomAccessFile(mEverStored, "rws");
out.seek(out.length());
out.writeUTF(packageName);
} catch (IOException e) {
Slog.e(TAG, "Can't log backup of " + packageName + " to " + mEverStored);
} finally {
try { if (out != null) out.close(); } catch (IOException e) {}
}
}
}
// Remove our awareness of having ever backed up the given package
void removeEverBackedUp(String packageName) {
if (DEBUG) Slog.v(TAG, "Removing backed-up knowledge of " + packageName);
if (MORE_DEBUG) Slog.v(TAG, "New set:");
synchronized (mEverStoredApps) {
// Rewrite the file and rename to overwrite. If we reboot in the middle,
// we'll recognize on initialization time that the package no longer
// exists and fix it up then.
File tempKnownFile = new File(mBaseStateDir, "processed.new");
RandomAccessFile known = null;
try {
known = new RandomAccessFile(tempKnownFile, "rws");
mEverStoredApps.remove(packageName);
for (String s : mEverStoredApps) {
known.writeUTF(s);
if (MORE_DEBUG) Slog.v(TAG, " " + s);
}
known.close();
known = null;
if (!tempKnownFile.renameTo(mEverStored)) {
throw new IOException("Can't rename " + tempKnownFile + " to " + mEverStored);
}
} catch (IOException e) {
// Bad: we couldn't create the new copy. For safety's sake we
// abandon the whole process and remove all what's-backed-up
// state entirely, meaning we'll force a backup pass for every
// participant on the next boot or [re]install.
Slog.w(TAG, "Error rewriting " + mEverStored, e);
mEverStoredApps.clear();
tempKnownFile.delete();
mEverStored.delete();
} finally {
try { if (known != null) known.close(); } catch (IOException e) {}
}
}
}
// Persistently record the current and ancestral backup tokens as well
// as the set of packages with data [supposedly] available in the
// ancestral dataset.
void writeRestoreTokens() {
try {
RandomAccessFile af = new RandomAccessFile(mTokenFile, "rwd");
// First, the version number of this record, for futureproofing
af.writeInt(CURRENT_ANCESTRAL_RECORD_VERSION);
// Write the ancestral and current tokens
af.writeLong(mAncestralToken);
af.writeLong(mCurrentToken);
// Now write the set of ancestral packages
if (mAncestralPackages == null) {
af.writeInt(-1);
} else {
af.writeInt(mAncestralPackages.size());
if (DEBUG) Slog.v(TAG, "Ancestral packages: " + mAncestralPackages.size());
for (String pkgName : mAncestralPackages) {
af.writeUTF(pkgName);
if (MORE_DEBUG) Slog.v(TAG, " " + pkgName);
}
}
af.close();
} catch (IOException e) {
Slog.w(TAG, "Unable to write token file:", e);
}
}
// Return the given transport
private IBackupTransport getTransport(String transportName) {
synchronized (mTransports) {
IBackupTransport transport = mTransports.get(transportName);
if (transport == null) {
Slog.w(TAG, "Requested unavailable transport: " + transportName);
}
return transport;
}
}
// fire off a backup agent, blocking until it attaches or times out
IBackupAgent bindToAgentSynchronous(ApplicationInfo app, int mode) {
IBackupAgent agent = null;
synchronized(mAgentConnectLock) {
mConnecting = true;
mConnectedAgent = null;
try {
if (mActivityManager.bindBackupAgent(app, mode)) {
Slog.d(TAG, "awaiting agent for " + app);
// success; wait for the agent to arrive
// only wait 10 seconds for the bind to happen
long timeoutMark = System.currentTimeMillis() + TIMEOUT_INTERVAL;
while (mConnecting && mConnectedAgent == null
&& (System.currentTimeMillis() < timeoutMark)) {
try {
mAgentConnectLock.wait(5000);
} catch (InterruptedException e) {
// just bail
if (DEBUG) Slog.w(TAG, "Interrupted: " + e);
mActivityManager.clearPendingBackup();
return null;
}
}
// if we timed out with no connect, abort and move on
if (mConnecting == true) {
Slog.w(TAG, "Timeout waiting for agent " + app);
mActivityManager.clearPendingBackup();
return null;
}
if (DEBUG) Slog.i(TAG, "got agent " + mConnectedAgent);
agent = mConnectedAgent;
}
} catch (RemoteException e) {
// can't happen - ActivityManager is local
}
}
return agent;
}
// clear an application's data, blocking until the operation completes or times out
void clearApplicationDataSynchronous(String packageName) {
// Don't wipe packages marked allowClearUserData=false
try {
PackageInfo info = mPackageManager.getPackageInfo(packageName, 0);
if ((info.applicationInfo.flags & ApplicationInfo.FLAG_ALLOW_CLEAR_USER_DATA) == 0) {
if (MORE_DEBUG) Slog.i(TAG, "allowClearUserData=false so not wiping "
+ packageName);
return;
}
} catch (NameNotFoundException e) {
Slog.w(TAG, "Tried to clear data for " + packageName + " but not found");
return;
}
ClearDataObserver observer = new ClearDataObserver();
synchronized(mClearDataLock) {
mClearingData = true;
try {
mActivityManager.clearApplicationUserData(packageName, observer, 0);
} catch (RemoteException e) {
// can't happen because the activity manager is in this process
}
// only wait 10 seconds for the clear data to happen
long timeoutMark = System.currentTimeMillis() + TIMEOUT_INTERVAL;
while (mClearingData && (System.currentTimeMillis() < timeoutMark)) {
try {
mClearDataLock.wait(5000);
} catch (InterruptedException e) {
// won't happen, but still.
mClearingData = false;
}
}
}
}
class ClearDataObserver extends IPackageDataObserver.Stub {
public void onRemoveCompleted(String packageName, boolean succeeded) {
synchronized(mClearDataLock) {
mClearingData = false;
mClearDataLock.notifyAll();
}
}
}
// Get the restore-set token for the best-available restore set for this package:
// the active set if possible, else the ancestral one. Returns zero if none available.
long getAvailableRestoreToken(String packageName) {
long token = mAncestralToken;
synchronized (mQueueLock) {
if (mEverStoredApps.contains(packageName)) {
token = mCurrentToken;
}
}
return token;
}
// -----
// Interface and methods used by the asynchronous-with-timeout backup/restore operations
interface BackupRestoreTask {
// Execute one tick of whatever state machine the task implements
void execute();
// An operation that wanted a callback has completed
void operationComplete();
// An operation that wanted a callback has timed out
void handleTimeout();
}
void prepareOperationTimeout(int token, long interval, BackupRestoreTask callback) {
if (MORE_DEBUG) Slog.v(TAG, "starting timeout: token=" + Integer.toHexString(token)
+ " interval=" + interval);
synchronized (mCurrentOpLock) {
mCurrentOperations.put(token, new Operation(OP_PENDING, callback));
Message msg = mBackupHandler.obtainMessage(MSG_TIMEOUT, token, 0, callback);
mBackupHandler.sendMessageDelayed(msg, interval);
}
}
// synchronous waiter case
boolean waitUntilOperationComplete(int token) {
if (MORE_DEBUG) Slog.i(TAG, "Blocking until operation complete for "
+ Integer.toHexString(token));
int finalState = OP_PENDING;
Operation op = null;
synchronized (mCurrentOpLock) {
while (true) {
op = mCurrentOperations.get(token);
if (op == null) {
// mysterious disappearance: treat as success with no callback
break;
} else {
if (op.state == OP_PENDING) {
try {
mCurrentOpLock.wait();
} catch (InterruptedException e) {}
// When the wait is notified we loop around and recheck the current state
} else {
// No longer pending; we're done
finalState = op.state;
break;
}
}
}
}
mBackupHandler.removeMessages(MSG_TIMEOUT);
if (MORE_DEBUG) Slog.v(TAG, "operation " + Integer.toHexString(token)
+ " complete: finalState=" + finalState);
return finalState == OP_ACKNOWLEDGED;
}
void handleTimeout(int token, Object obj) {
// Notify any synchronous waiters
Operation op = null;
synchronized (mCurrentOpLock) {
op = mCurrentOperations.get(token);
if (MORE_DEBUG) {
if (op == null) Slog.w(TAG, "Timeout of token " + Integer.toHexString(token)
+ " but no op found");
}
int state = (op != null) ? op.state : OP_TIMEOUT;
if (state == OP_PENDING) {
if (DEBUG) Slog.v(TAG, "TIMEOUT: token=" + Integer.toHexString(token));
op.state = OP_TIMEOUT;
mCurrentOperations.put(token, op);
}
mCurrentOpLock.notifyAll();
}
// If there's a TimeoutHandler for this event, call it
if (op != null && op.callback != null) {
op.callback.handleTimeout();
}
}
// ----- Back up a set of applications via a worker thread -----
enum BackupState {
INITIAL,
RUNNING_QUEUE,
FINAL
}
class PerformBackupTask implements BackupRestoreTask {
private static final String TAG = "PerformBackupTask";
IBackupTransport mTransport;
ArrayList<BackupRequest> mQueue;
ArrayList<BackupRequest> mOriginalQueue;
File mStateDir;
File mJournal;
BackupState mCurrentState;
// carried information about the current in-flight operation
PackageInfo mCurrentPackage;
File mSavedStateName;
File mBackupDataName;
File mNewStateName;
ParcelFileDescriptor mSavedState;
ParcelFileDescriptor mBackupData;
ParcelFileDescriptor mNewState;
int mStatus;
boolean mFinished;
public PerformBackupTask(IBackupTransport transport, String dirName,
ArrayList<BackupRequest> queue, File journal) {
mTransport = transport;
mOriginalQueue = queue;
mJournal = journal;
mStateDir = new File(mBaseStateDir, dirName);
mCurrentState = BackupState.INITIAL;
mFinished = false;
addBackupTrace("STATE => INITIAL");
}
// Main entry point: perform one chunk of work, updating the state as appropriate
// and reposting the next chunk to the primary backup handler thread.
@Override
public void execute() {
switch (mCurrentState) {
case INITIAL:
beginBackup();
break;
case RUNNING_QUEUE:
invokeNextAgent();
break;
case FINAL:
if (!mFinished) finalizeBackup();
else {
Slog.e(TAG, "Duplicate finish");
}
mFinished = true;
break;
}
}
// We're starting a backup pass. Initialize the transport and send
// the PM metadata blob if we haven't already.
void beginBackup() {
if (DEBUG_BACKUP_TRACE) {
clearBackupTrace();
StringBuilder b = new StringBuilder(256);
b.append("beginBackup: [");
for (BackupRequest req : mOriginalQueue) {
b.append(' ');
b.append(req.packageName);
}
b.append(" ]");
addBackupTrace(b.toString());
}
mStatus = BackupConstants.TRANSPORT_OK;
// Sanity check: if the queue is empty we have no work to do.
if (mOriginalQueue.isEmpty()) {
Slog.w(TAG, "Backup begun with an empty queue - nothing to do.");
addBackupTrace("queue empty at begin");
executeNextState(BackupState.FINAL);
return;
}
// We need to retain the original queue contents in case of transport
// failure, but we want a working copy that we can manipulate along
// the way.
mQueue = (ArrayList<BackupRequest>) mOriginalQueue.clone();
if (DEBUG) Slog.v(TAG, "Beginning backup of " + mQueue.size() + " targets");
File pmState = new File(mStateDir, PACKAGE_MANAGER_SENTINEL);
try {
final String transportName = mTransport.transportDirName();
EventLog.writeEvent(EventLogTags.BACKUP_START, transportName);
// If we haven't stored package manager metadata yet, we must init the transport.
if (mStatus == BackupConstants.TRANSPORT_OK && pmState.length() <= 0) {
Slog.i(TAG, "Initializing (wiping) backup state and transport storage");
addBackupTrace("initializing transport " + transportName);
resetBackupState(mStateDir); // Just to make sure.
mStatus = mTransport.initializeDevice();
addBackupTrace("transport.initializeDevice() == " + mStatus);
if (mStatus == BackupConstants.TRANSPORT_OK) {
EventLog.writeEvent(EventLogTags.BACKUP_INITIALIZE);
} else {
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, "(initialize)");
Slog.e(TAG, "Transport error in initializeDevice()");
}
}
// The package manager doesn't have a proper <application> etc, but since
// it's running here in the system process we can just set up its agent
// directly and use a synthetic BackupRequest. We always run this pass
// because it's cheap and this way we guarantee that we don't get out of
// step even if we're selecting among various transports at run time.
if (mStatus == BackupConstants.TRANSPORT_OK) {
PackageManagerBackupAgent pmAgent = new PackageManagerBackupAgent(
mPackageManager, allAgentPackages());
mStatus = invokeAgentForBackup(PACKAGE_MANAGER_SENTINEL,
IBackupAgent.Stub.asInterface(pmAgent.onBind()), mTransport);
addBackupTrace("PMBA invoke: " + mStatus);
}
if (mStatus == BackupConstants.TRANSPORT_NOT_INITIALIZED) {
// The backend reports that our dataset has been wiped. Note this in
// the event log; the no-success code below will reset the backup
// state as well.
EventLog.writeEvent(EventLogTags.BACKUP_RESET, mTransport.transportDirName());
}
} catch (Exception e) {
Slog.e(TAG, "Error in backup thread", e);
addBackupTrace("Exception in backup thread: " + e);
mStatus = BackupConstants.TRANSPORT_ERROR;
} finally {
// If we've succeeded so far, invokeAgentForBackup() will have run the PM
// metadata and its completion/timeout callback will continue the state
// machine chain. If it failed that won't happen; we handle that now.
addBackupTrace("exiting prelim: " + mStatus);
if (mStatus != BackupConstants.TRANSPORT_OK) {
// if things went wrong at this point, we need to
// restage everything and try again later.
resetBackupState(mStateDir); // Just to make sure.
executeNextState(BackupState.FINAL);
}
}
}
// Transport has been initialized and the PM metadata submitted successfully
// if that was warranted. Now we process the single next thing in the queue.
void invokeNextAgent() {
mStatus = BackupConstants.TRANSPORT_OK;
addBackupTrace("invoke q=" + mQueue.size());
// Sanity check that we have work to do. If not, skip to the end where
// we reestablish the wakelock invariants etc.
if (mQueue.isEmpty()) {
if (DEBUG) Slog.i(TAG, "queue now empty");
executeNextState(BackupState.FINAL);
return;
}
// pop the entry we're going to process on this step
BackupRequest request = mQueue.get(0);
mQueue.remove(0);
Slog.d(TAG, "starting agent for backup of " + request);
addBackupTrace("launch agent for " + request.packageName);
// Verify that the requested app exists; it might be something that
// requested a backup but was then uninstalled. The request was
// journalled and rather than tamper with the journal it's safer
// to sanity-check here. This also gives us the classname of the
// package's backup agent.
try {
mCurrentPackage = mPackageManager.getPackageInfo(request.packageName,
PackageManager.GET_SIGNATURES);
if (mCurrentPackage.applicationInfo.backupAgentName == null) {
// The manifest has changed but we had a stale backup request pending.
// This won't happen again because the app won't be requesting further
// backups.
Slog.i(TAG, "Package " + request.packageName
+ " no longer supports backup; skipping");
addBackupTrace("skipping - no agent, completion is noop");
executeNextState(BackupState.RUNNING_QUEUE);
return;
}
if ((mCurrentPackage.applicationInfo.flags & ApplicationInfo.FLAG_STOPPED) != 0) {
// The app has been force-stopped or cleared or just installed,
// and not yet launched out of that state, so just as it won't
// receive broadcasts, we won't run it for backup.
addBackupTrace("skipping - stopped");
executeNextState(BackupState.RUNNING_QUEUE);
return;
}
IBackupAgent agent = null;
try {
mWakelock.setWorkSource(new WorkSource(mCurrentPackage.applicationInfo.uid));
agent = bindToAgentSynchronous(mCurrentPackage.applicationInfo,
IApplicationThread.BACKUP_MODE_INCREMENTAL);
addBackupTrace("agent bound; a? = " + (agent != null));
if (agent != null) {
mStatus = invokeAgentForBackup(request.packageName, agent, mTransport);
// at this point we'll either get a completion callback from the
// agent, or a timeout message on the main handler. either way, we're
// done here as long as we're successful so far.
} else {
// Timeout waiting for the agent
mStatus = BackupConstants.AGENT_ERROR;
}
} catch (SecurityException ex) {
// Try for the next one.
Slog.d(TAG, "error in bind/backup", ex);
mStatus = BackupConstants.AGENT_ERROR;
addBackupTrace("agent SE");
}
} catch (NameNotFoundException e) {
Slog.d(TAG, "Package does not exist; skipping");
addBackupTrace("no such package");
mStatus = BackupConstants.AGENT_UNKNOWN;
} finally {
mWakelock.setWorkSource(null);
// If there was an agent error, no timeout/completion handling will occur.
// That means we need to direct to the next state ourselves.
if (mStatus != BackupConstants.TRANSPORT_OK) {
BackupState nextState = BackupState.RUNNING_QUEUE;
// An agent-level failure means we reenqueue this one agent for
// a later retry, but otherwise proceed normally.
if (mStatus == BackupConstants.AGENT_ERROR) {
if (MORE_DEBUG) Slog.i(TAG, "Agent failure for " + request.packageName
+ " - restaging");
dataChangedImpl(request.packageName);
mStatus = BackupConstants.TRANSPORT_OK;
if (mQueue.isEmpty()) nextState = BackupState.FINAL;
} else if (mStatus == BackupConstants.AGENT_UNKNOWN) {
// Failed lookup of the app, so we couldn't bring up an agent, but
// we're otherwise fine. Just drop it and go on to the next as usual.
mStatus = BackupConstants.TRANSPORT_OK;
} else {
// Transport-level failure means we reenqueue everything
revertAndEndBackup();
nextState = BackupState.FINAL;
}
executeNextState(nextState);
} else {
addBackupTrace("expecting completion/timeout callback");
}
}
}
void finalizeBackup() {
addBackupTrace("finishing");
// Either backup was successful, in which case we of course do not need
// this pass's journal any more; or it failed, in which case we just
// re-enqueued all of these packages in the current active journal.
// Either way, we no longer need this pass's journal.
if (mJournal != null && !mJournal.delete()) {
Slog.e(TAG, "Unable to remove backup journal file " + mJournal);
}
// If everything actually went through and this is the first time we've
// done a backup, we can now record what the current backup dataset token
// is.
if ((mCurrentToken == 0) && (mStatus == BackupConstants.TRANSPORT_OK)) {
addBackupTrace("success; recording token");
try {
mCurrentToken = mTransport.getCurrentRestoreSet();
writeRestoreTokens();
} catch (RemoteException e) {
// nothing for it at this point, unfortunately, but this will be
// recorded the next time we fully succeed.
addBackupTrace("transport threw returning token");
}
}
// Set up the next backup pass - at this point we can set mBackupRunning
// to false to allow another pass to fire, because we're done with the
// state machine sequence and the wakelock is refcounted.
synchronized (mQueueLock) {
mBackupRunning = false;
if (mStatus == BackupConstants.TRANSPORT_NOT_INITIALIZED) {
// Make sure we back up everything and perform the one-time init
clearMetadata();
if (DEBUG) Slog.d(TAG, "Server requires init; rerunning");
addBackupTrace("init required; rerunning");
backupNow();
}
}
// Only once we're entirely finished do we release the wakelock
clearBackupTrace();
Slog.i(TAG, "Backup pass finished.");
mWakelock.release();
}
// Remove the PM metadata state. This will generate an init on the next pass.
void clearMetadata() {
final File pmState = new File(mStateDir, PACKAGE_MANAGER_SENTINEL);
if (pmState.exists()) pmState.delete();
}
// Invoke an agent's doBackup() and start a timeout message spinning on the main
// handler in case it doesn't get back to us.
int invokeAgentForBackup(String packageName, IBackupAgent agent,
IBackupTransport transport) {
if (DEBUG) Slog.d(TAG, "invokeAgentForBackup on " + packageName);
addBackupTrace("invoking " + packageName);
mSavedStateName = new File(mStateDir, packageName);
mBackupDataName = new File(mDataDir, packageName + ".data");
mNewStateName = new File(mStateDir, packageName + ".new");
mSavedState = null;
mBackupData = null;
mNewState = null;
final int token = generateToken();
try {
// Look up the package info & signatures. This is first so that if it
// throws an exception, there's no file setup yet that would need to
// be unraveled.
if (packageName.equals(PACKAGE_MANAGER_SENTINEL)) {
// The metadata 'package' is synthetic; construct one and make
// sure our global state is pointed at it
mCurrentPackage = new PackageInfo();
mCurrentPackage.packageName = packageName;
}
// In a full backup, we pass a null ParcelFileDescriptor as
// the saved-state "file". This is by definition an incremental,
// so we build a saved state file to pass.
mSavedState = ParcelFileDescriptor.open(mSavedStateName,
ParcelFileDescriptor.MODE_READ_ONLY |
ParcelFileDescriptor.MODE_CREATE); // Make an empty file if necessary
mBackupData = ParcelFileDescriptor.open(mBackupDataName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
if (!SELinux.restorecon(mBackupDataName)) {
Slog.e(TAG, "SELinux restorecon failed on " + mBackupDataName);
}
mNewState = ParcelFileDescriptor.open(mNewStateName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
// Initiate the target's backup pass
addBackupTrace("setting timeout");
prepareOperationTimeout(token, TIMEOUT_BACKUP_INTERVAL, this);
addBackupTrace("calling agent doBackup()");
agent.doBackup(mSavedState, mBackupData, mNewState, token, mBackupManagerBinder);
} catch (Exception e) {
Slog.e(TAG, "Error invoking for backup on " + packageName);
addBackupTrace("exception: " + e);
EventLog.writeEvent(EventLogTags.BACKUP_AGENT_FAILURE, packageName,
e.toString());
agentErrorCleanup();
return BackupConstants.AGENT_ERROR;
}
// At this point the agent is off and running. The next thing to happen will
// either be a callback from the agent, at which point we'll process its data
// for transport, or a timeout. Either way the next phase will happen in
// response to the TimeoutHandler interface callbacks.
addBackupTrace("invoke success");
return BackupConstants.TRANSPORT_OK;
}
@Override
public void operationComplete() {
// Okay, the agent successfully reported back to us. Spin the data off to the
// transport and proceed with the next stage.
if (MORE_DEBUG) Slog.v(TAG, "operationComplete(): sending data to transport for "
+ mCurrentPackage.packageName);
mBackupHandler.removeMessages(MSG_TIMEOUT);
clearAgentState();
addBackupTrace("operation complete");
ParcelFileDescriptor backupData = null;
mStatus = BackupConstants.TRANSPORT_OK;
try {
int size = (int) mBackupDataName.length();
if (size > 0) {
if (mStatus == BackupConstants.TRANSPORT_OK) {
backupData = ParcelFileDescriptor.open(mBackupDataName,
ParcelFileDescriptor.MODE_READ_ONLY);
addBackupTrace("sending data to transport");
mStatus = mTransport.performBackup(mCurrentPackage, backupData);
}
// TODO - We call finishBackup() for each application backed up, because
// we need to know now whether it succeeded or failed. Instead, we should
// hold off on finishBackup() until the end, which implies holding off on
// renaming *all* the output state files (see below) until that happens.
addBackupTrace("data delivered: " + mStatus);
if (mStatus == BackupConstants.TRANSPORT_OK) {
addBackupTrace("finishing op on transport");
mStatus = mTransport.finishBackup();
addBackupTrace("finished: " + mStatus);
}
} else {
if (DEBUG) Slog.i(TAG, "no backup data written; not calling transport");
addBackupTrace("no data to send");
}
// After successful transport, delete the now-stale data
// and juggle the files so that next time we supply the agent
// with the new state file it just created.
if (mStatus == BackupConstants.TRANSPORT_OK) {
mBackupDataName.delete();
mNewStateName.renameTo(mSavedStateName);
EventLog.writeEvent(EventLogTags.BACKUP_PACKAGE,
mCurrentPackage.packageName, size);
logBackupComplete(mCurrentPackage.packageName);
} else {
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE,
mCurrentPackage.packageName);
}
} catch (Exception e) {
Slog.e(TAG, "Transport error backing up " + mCurrentPackage.packageName, e);
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE,
mCurrentPackage.packageName);
mStatus = BackupConstants.TRANSPORT_ERROR;
} finally {
try { if (backupData != null) backupData.close(); } catch (IOException e) {}
}
// If we encountered an error here it's a transport-level failure. That
// means we need to halt everything and reschedule everything for next time.
final BackupState nextState;
if (mStatus != BackupConstants.TRANSPORT_OK) {
revertAndEndBackup();
nextState = BackupState.FINAL;
} else {
// Success! Proceed with the next app if any, otherwise we're done.
nextState = (mQueue.isEmpty()) ? BackupState.FINAL : BackupState.RUNNING_QUEUE;
}
executeNextState(nextState);
}
@Override
public void handleTimeout() {
// Whoops, the current agent timed out running doBackup(). Tidy up and restage
// it for the next time we run a backup pass.
// !!! TODO: keep track of failure counts per agent, and blacklist those which
// fail repeatedly (i.e. have proved themselves to be buggy).
Slog.e(TAG, "Timeout backing up " + mCurrentPackage.packageName);
EventLog.writeEvent(EventLogTags.BACKUP_AGENT_FAILURE, mCurrentPackage.packageName,
"timeout");
addBackupTrace("timeout of " + mCurrentPackage.packageName);
agentErrorCleanup();
dataChangedImpl(mCurrentPackage.packageName);
}
void revertAndEndBackup() {
if (MORE_DEBUG) Slog.i(TAG, "Reverting backup queue - restaging everything");
addBackupTrace("transport error; reverting");
for (BackupRequest request : mOriginalQueue) {
dataChangedImpl(request.packageName);
}
// We also want to reset the backup schedule based on whatever
// the transport suggests by way of retry/backoff time.
restartBackupAlarm();
}
void agentErrorCleanup() {
mBackupDataName.delete();
mNewStateName.delete();
clearAgentState();
executeNextState(mQueue.isEmpty() ? BackupState.FINAL : BackupState.RUNNING_QUEUE);
}
// Cleanup common to both success and failure cases
void clearAgentState() {
try { if (mSavedState != null) mSavedState.close(); } catch (IOException e) {}
try { if (mBackupData != null) mBackupData.close(); } catch (IOException e) {}
try { if (mNewState != null) mNewState.close(); } catch (IOException e) {}
mSavedState = mBackupData = mNewState = null;
synchronized (mCurrentOpLock) {
mCurrentOperations.clear();
}
// If this was a pseudopackage there's no associated Activity Manager state
if (mCurrentPackage.applicationInfo != null) {
addBackupTrace("unbinding " + mCurrentPackage.packageName);
try { // unbind even on timeout, just in case
mActivityManager.unbindBackupAgent(mCurrentPackage.applicationInfo);
} catch (RemoteException e) { /* can't happen; activity manager is local */ }
}
}
void restartBackupAlarm() {
addBackupTrace("setting backup trigger");
synchronized (mQueueLock) {
try {
startBackupAlarmsLocked(mTransport.requestBackupTime());
} catch (RemoteException e) { /* cannot happen */ }
}
}
void executeNextState(BackupState nextState) {
if (MORE_DEBUG) Slog.i(TAG, " => executing next step on "
+ this + " nextState=" + nextState);
addBackupTrace("executeNextState => " + nextState);
mCurrentState = nextState;
Message msg = mBackupHandler.obtainMessage(MSG_BACKUP_RESTORE_STEP, this);
mBackupHandler.sendMessage(msg);
}
}
// ----- Full backup/restore to a file/socket -----
abstract class ObbServiceClient {
public IObbBackupService mObbService;
public void setObbBinder(IObbBackupService binder) {
mObbService = binder;
}
}
class FullBackupObbConnection implements ServiceConnection {
volatile IObbBackupService mService;
FullBackupObbConnection() {
mService = null;
}
public void establish() {
if (DEBUG) Slog.i(TAG, "Initiating bind of OBB service on " + this);
Intent obbIntent = new Intent().setComponent(new ComponentName(
"com.android.sharedstoragebackup",
"com.android.sharedstoragebackup.ObbBackupService"));
BackupManagerService.this.mContext.bindService(
obbIntent, this, Context.BIND_AUTO_CREATE);
}
public void tearDown() {
BackupManagerService.this.mContext.unbindService(this);
}
public boolean backupObbs(PackageInfo pkg, OutputStream out) {
boolean success = false;
waitForConnection();
ParcelFileDescriptor[] pipes = null;
try {
pipes = ParcelFileDescriptor.createPipe();
int token = generateToken();
prepareOperationTimeout(token, TIMEOUT_FULL_BACKUP_INTERVAL, null);
mService.backupObbs(pkg.packageName, pipes[1], token, mBackupManagerBinder);
routeSocketDataToOutput(pipes[0], out);
success = waitUntilOperationComplete(token);
} catch (Exception e) {
Slog.w(TAG, "Unable to back up OBBs for " + pkg, e);
} finally {
try {
out.flush();
if (pipes != null) {
if (pipes[0] != null) pipes[0].close();
if (pipes[1] != null) pipes[1].close();
}
} catch (IOException e) {
Slog.w(TAG, "I/O error closing down OBB backup", e);
}
}
return success;
}
public void restoreObbFile(String pkgName, ParcelFileDescriptor data,
long fileSize, int type, String path, long mode, long mtime,
int token, IBackupManager callbackBinder) {
waitForConnection();
try {
mService.restoreObbFile(pkgName, data, fileSize, type, path, mode, mtime,
token, callbackBinder);
} catch (Exception e) {
Slog.w(TAG, "Unable to restore OBBs for " + pkgName, e);
}
}
private void waitForConnection() {
synchronized (this) {
while (mService == null) {
if (DEBUG) Slog.i(TAG, "...waiting for OBB service binding...");
try {
this.wait();
} catch (InterruptedException e) { /* never interrupted */ }
}
if (DEBUG) Slog.i(TAG, "Connected to OBB service; continuing");
}
}
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
synchronized (this) {
mService = IObbBackupService.Stub.asInterface(service);
if (DEBUG) Slog.i(TAG, "OBB service connection " + mService
+ " connected on " + this);
this.notifyAll();
}
}
@Override
public void onServiceDisconnected(ComponentName name) {
synchronized (this) {
mService = null;
if (DEBUG) Slog.i(TAG, "OBB service connection disconnected on " + this);
this.notifyAll();
}
}
}
private void routeSocketDataToOutput(ParcelFileDescriptor inPipe, OutputStream out)
throws IOException {
FileInputStream raw = new FileInputStream(inPipe.getFileDescriptor());
DataInputStream in = new DataInputStream(raw);
byte[] buffer = new byte[32 * 1024];
int chunkTotal;
while ((chunkTotal = in.readInt()) > 0) {
while (chunkTotal > 0) {
int toRead = (chunkTotal > buffer.length) ? buffer.length : chunkTotal;
int nRead = in.read(buffer, 0, toRead);
out.write(buffer, 0, nRead);
chunkTotal -= nRead;
}
}
}
class PerformFullBackupTask extends ObbServiceClient implements Runnable {
ParcelFileDescriptor mOutputFile;
DeflaterOutputStream mDeflater;
IFullBackupRestoreObserver mObserver;
boolean mIncludeApks;
boolean mIncludeObbs;
boolean mIncludeShared;
boolean mAllApps;
final boolean mIncludeSystem;
String[] mPackages;
String mCurrentPassword;
String mEncryptPassword;
AtomicBoolean mLatchObject;
File mFilesDir;
File mManifestFile;
class FullBackupRunner implements Runnable {
PackageInfo mPackage;
IBackupAgent mAgent;
ParcelFileDescriptor mPipe;
int mToken;
boolean mSendApk;
boolean mWriteManifest;
FullBackupRunner(PackageInfo pack, IBackupAgent agent, ParcelFileDescriptor pipe,
int token, boolean sendApk, boolean writeManifest) throws IOException {
mPackage = pack;
mAgent = agent;
mPipe = ParcelFileDescriptor.dup(pipe.getFileDescriptor());
mToken = token;
mSendApk = sendApk;
mWriteManifest = writeManifest;
}
@Override
public void run() {
try {
BackupDataOutput output = new BackupDataOutput(
mPipe.getFileDescriptor());
if (mWriteManifest) {
if (MORE_DEBUG) Slog.d(TAG, "Writing manifest for " + mPackage.packageName);
writeAppManifest(mPackage, mManifestFile, mSendApk);
FullBackup.backupToTar(mPackage.packageName, null, null,
mFilesDir.getAbsolutePath(),
mManifestFile.getAbsolutePath(),
output);
}
if (mSendApk) {
writeApkToBackup(mPackage, output);
}
if (DEBUG) Slog.d(TAG, "Calling doFullBackup() on " + mPackage.packageName);
prepareOperationTimeout(mToken, TIMEOUT_FULL_BACKUP_INTERVAL, null);
mAgent.doFullBackup(mPipe, mToken, mBackupManagerBinder);
} catch (IOException e) {
Slog.e(TAG, "Error running full backup for " + mPackage.packageName);
} catch (RemoteException e) {
Slog.e(TAG, "Remote agent vanished during full backup of "
+ mPackage.packageName);
} finally {
try {
mPipe.close();
} catch (IOException e) {}
}
}
}
PerformFullBackupTask(ParcelFileDescriptor fd, IFullBackupRestoreObserver observer,
boolean includeApks, boolean includeObbs, boolean includeShared,
String curPassword, String encryptPassword, boolean doAllApps,
boolean doSystem, String[] packages, AtomicBoolean latch) {
mOutputFile = fd;
mObserver = observer;
mIncludeApks = includeApks;
mIncludeObbs = includeObbs;
mIncludeShared = includeShared;
mAllApps = doAllApps;
mIncludeSystem = doSystem;
mPackages = packages;
mCurrentPassword = curPassword;
// when backing up, if there is a current backup password, we require that
// the user use a nonempty encryption password as well. if one is supplied
// in the UI we use that, but if the UI was left empty we fall back to the
// current backup password (which was supplied by the user as well).
if (encryptPassword == null || "".equals(encryptPassword)) {
mEncryptPassword = curPassword;
} else {
mEncryptPassword = encryptPassword;
}
mLatchObject = latch;
mFilesDir = new File("/data/system");
mManifestFile = new File(mFilesDir, BACKUP_MANIFEST_FILENAME);
}
@Override
public void run() {
Slog.i(TAG, "--- Performing full-dataset backup ---");
List<PackageInfo> packagesToBackup = new ArrayList<PackageInfo>();
FullBackupObbConnection obbConnection = new FullBackupObbConnection();
obbConnection.establish(); // we'll want this later
sendStartBackup();
// doAllApps supersedes the package set if any
if (mAllApps) {
packagesToBackup = mPackageManager.getInstalledPackages(
PackageManager.GET_SIGNATURES);
// Exclude system apps if we've been asked to do so
if (mIncludeSystem == false) {
for (int i = 0; i < packagesToBackup.size(); ) {
PackageInfo pkg = packagesToBackup.get(i);
if ((pkg.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
packagesToBackup.remove(i);
} else {
i++;
}
}
}
}
// Now process the command line argument packages, if any. Note that explicitly-
// named system-partition packages will be included even if includeSystem was
// set to false.
if (mPackages != null) {
for (String pkgName : mPackages) {
try {
packagesToBackup.add(mPackageManager.getPackageInfo(pkgName,
PackageManager.GET_SIGNATURES));
} catch (NameNotFoundException e) {
Slog.w(TAG, "Unknown package " + pkgName + ", skipping");
}
}
}
// Cull any packages that have indicated that backups are not permitted, as well
// as any explicit mention of the 'special' shared-storage agent package (we
// handle that one at the end).
for (int i = 0; i < packagesToBackup.size(); ) {
PackageInfo pkg = packagesToBackup.get(i);
if ((pkg.applicationInfo.flags & ApplicationInfo.FLAG_ALLOW_BACKUP) == 0
|| pkg.packageName.equals(SHARED_BACKUP_AGENT_PACKAGE)) {
packagesToBackup.remove(i);
} else {
i++;
}
}
// Cull any packages that run as system-domain uids but do not define their
// own backup agents
for (int i = 0; i < packagesToBackup.size(); ) {
PackageInfo pkg = packagesToBackup.get(i);
if ((pkg.applicationInfo.uid < Process.FIRST_APPLICATION_UID)
&& (pkg.applicationInfo.backupAgentName == null)) {
if (MORE_DEBUG) {
Slog.i(TAG, "... ignoring non-agent system package " + pkg.packageName);
}
packagesToBackup.remove(i);
} else {
i++;
}
}
FileOutputStream ofstream = new FileOutputStream(mOutputFile.getFileDescriptor());
OutputStream out = null;
PackageInfo pkg = null;
try {
boolean encrypting = (mEncryptPassword != null && mEncryptPassword.length() > 0);
boolean compressing = COMPRESS_FULL_BACKUPS;
OutputStream finalOutput = ofstream;
// Verify that the given password matches the currently-active
// backup password, if any
if (!backupPasswordMatches(mCurrentPassword)) {
if (DEBUG) Slog.w(TAG, "Backup password mismatch; aborting");
return;
}
// Write the global file header. All strings are UTF-8 encoded; lines end
// with a '\n' byte. Actual backup data begins immediately following the
// final '\n'.
//
// line 1: "ANDROID BACKUP"
// line 2: backup file format version, currently "2"
// line 3: compressed? "0" if not compressed, "1" if compressed.
// line 4: name of encryption algorithm [currently only "none" or "AES-256"]
//
// When line 4 is not "none", then additional header data follows:
//
// line 5: user password salt [hex]
// line 6: master key checksum salt [hex]
// line 7: number of PBKDF2 rounds to use (same for user & master) [decimal]
// line 8: IV of the user key [hex]
// line 9: master key blob [hex]
// IV of the master key, master key itself, master key checksum hash
//
// The master key checksum is the master key plus its checksum salt, run through
// 10k rounds of PBKDF2. This is used to verify that the user has supplied the
// correct password for decrypting the archive: the master key decrypted from
// the archive using the user-supplied password is also run through PBKDF2 in
// this way, and if the result does not match the checksum as stored in the
// archive, then we know that the user-supplied password does not match the
// archive's.
StringBuilder headerbuf = new StringBuilder(1024);
headerbuf.append(BACKUP_FILE_HEADER_MAGIC);
headerbuf.append(BACKUP_FILE_VERSION); // integer, no trailing \n
headerbuf.append(compressing ? "\n1\n" : "\n0\n");
try {
// Set up the encryption stage if appropriate, and emit the correct header
if (encrypting) {
finalOutput = emitAesBackupHeader(headerbuf, finalOutput);
} else {
headerbuf.append("none\n");
}
byte[] header = headerbuf.toString().getBytes("UTF-8");
ofstream.write(header);
// Set up the compression stage feeding into the encryption stage (if any)
if (compressing) {
Deflater deflater = new Deflater(Deflater.BEST_COMPRESSION);
finalOutput = new DeflaterOutputStream(finalOutput, deflater, true);
}
out = finalOutput;
} catch (Exception e) {
// Should never happen!
Slog.e(TAG, "Unable to emit archive header", e);
return;
}
// Shared storage if requested
if (mIncludeShared) {
try {
pkg = mPackageManager.getPackageInfo(SHARED_BACKUP_AGENT_PACKAGE, 0);
packagesToBackup.add(pkg);
} catch (NameNotFoundException e) {
Slog.e(TAG, "Unable to find shared-storage backup handler");
}
}
// Now back up the app data via the agent mechanism
int N = packagesToBackup.size();
for (int i = 0; i < N; i++) {
pkg = packagesToBackup.get(i);
backupOnePackage(pkg, out);
// after the app's agent runs to handle its private filesystem
// contents, back up any OBB content it has on its behalf.
if (mIncludeObbs) {
boolean obbOkay = obbConnection.backupObbs(pkg, out);
if (!obbOkay) {
throw new RuntimeException("Failure writing OBB stack for " + pkg);
}
}
}
// Done!
finalizeBackup(out);
} catch (RemoteException e) {
Slog.e(TAG, "App died during full backup");
} catch (Exception e) {
Slog.e(TAG, "Internal exception during full backup", e);
} finally {
tearDown(pkg);
try {
if (out != null) out.close();
mOutputFile.close();
} catch (IOException e) {
/* nothing we can do about this */
}
synchronized (mCurrentOpLock) {
mCurrentOperations.clear();
}
synchronized (mLatchObject) {
mLatchObject.set(true);
mLatchObject.notifyAll();
}
sendEndBackup();
obbConnection.tearDown();
if (DEBUG) Slog.d(TAG, "Full backup pass complete.");
mWakelock.release();
}
}
private OutputStream emitAesBackupHeader(StringBuilder headerbuf,
OutputStream ofstream) throws Exception {
// User key will be used to encrypt the master key.
byte[] newUserSalt = randomBytes(PBKDF2_SALT_SIZE);
SecretKey userKey = buildPasswordKey(PBKDF_CURRENT, mEncryptPassword, newUserSalt,
PBKDF2_HASH_ROUNDS);
// the master key is random for each backup
byte[] masterPw = new byte[256 / 8];
mRng.nextBytes(masterPw);
byte[] checksumSalt = randomBytes(PBKDF2_SALT_SIZE);
// primary encryption of the datastream with the random key
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKeySpec masterKeySpec = new SecretKeySpec(masterPw, "AES");
c.init(Cipher.ENCRYPT_MODE, masterKeySpec);
OutputStream finalOutput = new CipherOutputStream(ofstream, c);
// line 4: name of encryption algorithm
headerbuf.append(ENCRYPTION_ALGORITHM_NAME);
headerbuf.append('\n');
// line 5: user password salt [hex]
headerbuf.append(byteArrayToHex(newUserSalt));
headerbuf.append('\n');
// line 6: master key checksum salt [hex]
headerbuf.append(byteArrayToHex(checksumSalt));
headerbuf.append('\n');
// line 7: number of PBKDF2 rounds used [decimal]
headerbuf.append(PBKDF2_HASH_ROUNDS);
headerbuf.append('\n');
// line 8: IV of the user key [hex]
Cipher mkC = Cipher.getInstance("AES/CBC/PKCS5Padding");
mkC.init(Cipher.ENCRYPT_MODE, userKey);
byte[] IV = mkC.getIV();
headerbuf.append(byteArrayToHex(IV));
headerbuf.append('\n');
// line 9: master IV + key blob, encrypted by the user key [hex]. Blob format:
// [byte] IV length = Niv
// [array of Niv bytes] IV itself
// [byte] master key length = Nmk
// [array of Nmk bytes] master key itself
// [byte] MK checksum hash length = Nck
// [array of Nck bytes] master key checksum hash
//
// The checksum is the (master key + checksum salt), run through the
// stated number of PBKDF2 rounds
IV = c.getIV();
byte[] mk = masterKeySpec.getEncoded();
byte[] checksum = makeKeyChecksum(PBKDF_CURRENT, masterKeySpec.getEncoded(),
checksumSalt, PBKDF2_HASH_ROUNDS);
ByteArrayOutputStream blob = new ByteArrayOutputStream(IV.length + mk.length
+ checksum.length + 3);
DataOutputStream mkOut = new DataOutputStream(blob);
mkOut.writeByte(IV.length);
mkOut.write(IV);
mkOut.writeByte(mk.length);
mkOut.write(mk);
mkOut.writeByte(checksum.length);
mkOut.write(checksum);
mkOut.flush();
byte[] encryptedMk = mkC.doFinal(blob.toByteArray());
headerbuf.append(byteArrayToHex(encryptedMk));
headerbuf.append('\n');
return finalOutput;
}
private void backupOnePackage(PackageInfo pkg, OutputStream out)
throws RemoteException {
Slog.d(TAG, "Binding to full backup agent : " + pkg.packageName);
IBackupAgent agent = bindToAgentSynchronous(pkg.applicationInfo,
IApplicationThread.BACKUP_MODE_FULL);
if (agent != null) {
ParcelFileDescriptor[] pipes = null;
try {
pipes = ParcelFileDescriptor.createPipe();
ApplicationInfo app = pkg.applicationInfo;
final boolean isSharedStorage = pkg.packageName.equals(SHARED_BACKUP_AGENT_PACKAGE);
final boolean sendApk = mIncludeApks
&& !isSharedStorage
&& ((app.flags & ApplicationInfo.FLAG_FORWARD_LOCK) == 0)
&& ((app.flags & ApplicationInfo.FLAG_SYSTEM) == 0 ||
(app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0);
sendOnBackupPackage(isSharedStorage ? "Shared storage" : pkg.packageName);
final int token = generateToken();
FullBackupRunner runner = new FullBackupRunner(pkg, agent, pipes[1],
token, sendApk, !isSharedStorage);
pipes[1].close(); // the runner has dup'd it
pipes[1] = null;
Thread t = new Thread(runner);
t.start();
// Now pull data from the app and stuff it into the compressor
try {
routeSocketDataToOutput(pipes[0], out);
} catch (IOException e) {
Slog.i(TAG, "Caught exception reading from agent", e);
}
if (!waitUntilOperationComplete(token)) {
Slog.e(TAG, "Full backup failed on package " + pkg.packageName);
} else {
if (DEBUG) Slog.d(TAG, "Full package backup success: " + pkg.packageName);
}
} catch (IOException e) {
Slog.e(TAG, "Error backing up " + pkg.packageName, e);
} finally {
try {
// flush after every package
out.flush();
if (pipes != null) {
if (pipes[0] != null) pipes[0].close();
if (pipes[1] != null) pipes[1].close();
}
} catch (IOException e) {
Slog.w(TAG, "Error bringing down backup stack");
}
}
} else {
Slog.w(TAG, "Unable to bind to full agent for " + pkg.packageName);
}
tearDown(pkg);
}
private void writeApkToBackup(PackageInfo pkg, BackupDataOutput output) {
// Forward-locked apps, system-bundled .apks, etc are filtered out before we get here
final String appSourceDir = pkg.applicationInfo.sourceDir;
final String apkDir = new File(appSourceDir).getParent();
FullBackup.backupToTar(pkg.packageName, FullBackup.APK_TREE_TOKEN, null,
apkDir, appSourceDir, output);
// TODO: migrate this to SharedStorageBackup, since AID_SYSTEM
// doesn't have access to external storage.
// Save associated .obb content if it exists and we did save the apk
// check for .obb and save those too
final UserEnvironment userEnv = new UserEnvironment(UserHandle.USER_OWNER);
final File obbDir = userEnv.buildExternalStorageAppObbDirs(pkg.packageName)[0];
if (obbDir != null) {
if (MORE_DEBUG) Log.i(TAG, "obb dir: " + obbDir.getAbsolutePath());
File[] obbFiles = obbDir.listFiles();
if (obbFiles != null) {
final String obbDirName = obbDir.getAbsolutePath();
for (File obb : obbFiles) {
FullBackup.backupToTar(pkg.packageName, FullBackup.OBB_TREE_TOKEN, null,
obbDirName, obb.getAbsolutePath(), output);
}
}
}
}
private void finalizeBackup(OutputStream out) {
try {
// A standard 'tar' EOF sequence: two 512-byte blocks of all zeroes.
byte[] eof = new byte[512 * 2]; // newly allocated == zero filled
out.write(eof);
} catch (IOException e) {
Slog.w(TAG, "Error attempting to finalize backup stream");
}
}
private void writeAppManifest(PackageInfo pkg, File manifestFile, boolean withApk)
throws IOException {
// Manifest format. All data are strings ending in LF:
// BACKUP_MANIFEST_VERSION, currently 1
//
// Version 1:
// package name
// package's versionCode
// platform versionCode
// getInstallerPackageName() for this package (maybe empty)
// boolean: "1" if archive includes .apk; any other string means not
// number of signatures == N
// N*: signature byte array in ascii format per Signature.toCharsString()
StringBuilder builder = new StringBuilder(4096);
StringBuilderPrinter printer = new StringBuilderPrinter(builder);
printer.println(Integer.toString(BACKUP_MANIFEST_VERSION));
printer.println(pkg.packageName);
printer.println(Integer.toString(pkg.versionCode));
printer.println(Integer.toString(Build.VERSION.SDK_INT));
String installerName = mPackageManager.getInstallerPackageName(pkg.packageName);
printer.println((installerName != null) ? installerName : "");
printer.println(withApk ? "1" : "0");
if (pkg.signatures == null) {
printer.println("0");
} else {
printer.println(Integer.toString(pkg.signatures.length));
for (Signature sig : pkg.signatures) {
printer.println(sig.toCharsString());
}
}
FileOutputStream outstream = new FileOutputStream(manifestFile);
outstream.write(builder.toString().getBytes());
outstream.close();
}
private void tearDown(PackageInfo pkg) {
if (pkg != null) {
final ApplicationInfo app = pkg.applicationInfo;
if (app != null) {
try {
// unbind and tidy up even on timeout or failure, just in case
mActivityManager.unbindBackupAgent(app);
// The agent was running with a stub Application object, so shut it down.
if (app.uid != Process.SYSTEM_UID
&& app.uid != Process.PHONE_UID) {
if (MORE_DEBUG) Slog.d(TAG, "Backup complete, killing host process");
mActivityManager.killApplicationProcess(app.processName, app.uid);
} else {
if (MORE_DEBUG) Slog.d(TAG, "Not killing after restore: " + app.processName);
}
} catch (RemoteException e) {
Slog.d(TAG, "Lost app trying to shut down");
}
}
}
}
// wrappers for observer use
void sendStartBackup() {
if (mObserver != null) {
try {
mObserver.onStartBackup();
} catch (RemoteException e) {
Slog.w(TAG, "full backup observer went away: startBackup");
mObserver = null;
}
}
}
void sendOnBackupPackage(String name) {
if (mObserver != null) {
try {
// TODO: use a more user-friendly name string
mObserver.onBackupPackage(name);
} catch (RemoteException e) {
Slog.w(TAG, "full backup observer went away: backupPackage");
mObserver = null;
}
}
}
void sendEndBackup() {
if (mObserver != null) {
try {
mObserver.onEndBackup();
} catch (RemoteException e) {
Slog.w(TAG, "full backup observer went away: endBackup");
mObserver = null;
}
}
}
}
// ----- Full restore from a file/socket -----
// Description of a file in the restore datastream
static class FileMetadata {
String packageName; // name of the owning app
String installerPackageName; // name of the market-type app that installed the owner
int type; // e.g. BackupAgent.TYPE_DIRECTORY
String domain; // e.g. FullBackup.DATABASE_TREE_TOKEN
String path; // subpath within the semantic domain
long mode; // e.g. 0666 (actually int)
long mtime; // last mod time, UTC time_t (actually int)
long size; // bytes of content
@Override
public String toString() {
StringBuilder sb = new StringBuilder(128);
sb.append("FileMetadata{");
sb.append(packageName); sb.append(',');
sb.append(type); sb.append(',');
sb.append(domain); sb.append(':'); sb.append(path); sb.append(',');
sb.append(size);
sb.append('}');
return sb.toString();
}
}
enum RestorePolicy {
IGNORE,
ACCEPT,
ACCEPT_IF_APK
}
class PerformFullRestoreTask extends ObbServiceClient implements Runnable {
ParcelFileDescriptor mInputFile;
String mCurrentPassword;
String mDecryptPassword;
IFullBackupRestoreObserver mObserver;
AtomicBoolean mLatchObject;
IBackupAgent mAgent;
String mAgentPackage;
ApplicationInfo mTargetApp;
FullBackupObbConnection mObbConnection = null;
ParcelFileDescriptor[] mPipes = null;
long mBytes;
// possible handling states for a given package in the restore dataset
final HashMap<String, RestorePolicy> mPackagePolicies
= new HashMap<String, RestorePolicy>();
// installer package names for each encountered app, derived from the manifests
final HashMap<String, String> mPackageInstallers = new HashMap<String, String>();
// Signatures for a given package found in its manifest file
final HashMap<String, Signature[]> mManifestSignatures
= new HashMap<String, Signature[]>();
// Packages we've already wiped data on when restoring their first file
final HashSet<String> mClearedPackages = new HashSet<String>();
PerformFullRestoreTask(ParcelFileDescriptor fd, String curPassword, String decryptPassword,
IFullBackupRestoreObserver observer, AtomicBoolean latch) {
mInputFile = fd;
mCurrentPassword = curPassword;
mDecryptPassword = decryptPassword;
mObserver = observer;
mLatchObject = latch;
mAgent = null;
mAgentPackage = null;
mTargetApp = null;
mObbConnection = new FullBackupObbConnection();
// Which packages we've already wiped data on. We prepopulate this
// with a whitelist of packages known to be unclearable.
mClearedPackages.add("android");
mClearedPackages.add("com.android.providers.settings");
}
class RestoreFileRunnable implements Runnable {
IBackupAgent mAgent;
FileMetadata mInfo;
ParcelFileDescriptor mSocket;
int mToken;
RestoreFileRunnable(IBackupAgent agent, FileMetadata info,
ParcelFileDescriptor socket, int token) throws IOException {
mAgent = agent;
mInfo = info;
mToken = token;
// This class is used strictly for process-local binder invocations. The
// semantics of ParcelFileDescriptor differ in this case; in particular, we
// do not automatically get a 'dup'ed descriptor that we can can continue
// to use asynchronously from the caller. So, we make sure to dup it ourselves
// before proceeding to do the restore.
mSocket = ParcelFileDescriptor.dup(socket.getFileDescriptor());
}
@Override
public void run() {
try {
mAgent.doRestoreFile(mSocket, mInfo.size, mInfo.type,
mInfo.domain, mInfo.path, mInfo.mode, mInfo.mtime,
mToken, mBackupManagerBinder);
} catch (RemoteException e) {
// never happens; this is used strictly for local binder calls
}
}
}
@Override
public void run() {
Slog.i(TAG, "--- Performing full-dataset restore ---");
mObbConnection.establish();
sendStartRestore();
// Are we able to restore shared-storage data?
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
mPackagePolicies.put(SHARED_BACKUP_AGENT_PACKAGE, RestorePolicy.ACCEPT);
}
FileInputStream rawInStream = null;
DataInputStream rawDataIn = null;
try {
if (!backupPasswordMatches(mCurrentPassword)) {
if (DEBUG) Slog.w(TAG, "Backup password mismatch; aborting");
return;
}
mBytes = 0;
byte[] buffer = new byte[32 * 1024];
rawInStream = new FileInputStream(mInputFile.getFileDescriptor());
rawDataIn = new DataInputStream(rawInStream);
// First, parse out the unencrypted/uncompressed header
boolean compressed = false;
InputStream preCompressStream = rawInStream;
final InputStream in;
boolean okay = false;
final int headerLen = BACKUP_FILE_HEADER_MAGIC.length();
byte[] streamHeader = new byte[headerLen];
rawDataIn.readFully(streamHeader);
byte[] magicBytes = BACKUP_FILE_HEADER_MAGIC.getBytes("UTF-8");
if (Arrays.equals(magicBytes, streamHeader)) {
// okay, header looks good. now parse out the rest of the fields.
String s = readHeaderLine(rawInStream);
final int archiveVersion = Integer.parseInt(s);
if (archiveVersion <= BACKUP_FILE_VERSION) {
// okay, it's a version we recognize. if it's version 1, we may need
// to try two different PBKDF2 regimes to compare checksums.
final boolean pbkdf2Fallback = (archiveVersion == 1);
s = readHeaderLine(rawInStream);
compressed = (Integer.parseInt(s) != 0);
s = readHeaderLine(rawInStream);
if (s.equals("none")) {
// no more header to parse; we're good to go
okay = true;
} else if (mDecryptPassword != null && mDecryptPassword.length() > 0) {
preCompressStream = decodeAesHeaderAndInitialize(s, pbkdf2Fallback,
rawInStream);
if (preCompressStream != null) {
okay = true;
}
} else Slog.w(TAG, "Archive is encrypted but no password given");
} else Slog.w(TAG, "Wrong header version: " + s);
} else Slog.w(TAG, "Didn't read the right header magic");
if (!okay) {
Slog.w(TAG, "Invalid restore data; aborting.");
return;
}
// okay, use the right stream layer based on compression
in = (compressed) ? new InflaterInputStream(preCompressStream) : preCompressStream;
boolean didRestore;
do {
didRestore = restoreOneFile(in, buffer);
} while (didRestore);
if (MORE_DEBUG) Slog.v(TAG, "Done consuming input tarfile, total bytes=" + mBytes);
} catch (IOException e) {
Slog.e(TAG, "Unable to read restore input");
} finally {
tearDownPipes();
tearDownAgent(mTargetApp);
try {
if (rawDataIn != null) rawDataIn.close();
if (rawInStream != null) rawInStream.close();
mInputFile.close();
} catch (IOException e) {
Slog.w(TAG, "Close of restore data pipe threw", e);
/* nothing we can do about this */
}
synchronized (mCurrentOpLock) {
mCurrentOperations.clear();
}
synchronized (mLatchObject) {
mLatchObject.set(true);
mLatchObject.notifyAll();
}
mObbConnection.tearDown();
sendEndRestore();
Slog.d(TAG, "Full restore pass complete.");
mWakelock.release();
}
}
String readHeaderLine(InputStream in) throws IOException {
int c;
StringBuilder buffer = new StringBuilder(80);
while ((c = in.read()) >= 0) {
if (c == '\n') break; // consume and discard the newlines
buffer.append((char)c);
}
return buffer.toString();
}
InputStream attemptMasterKeyDecryption(String algorithm, byte[] userSalt, byte[] ckSalt,
int rounds, String userIvHex, String masterKeyBlobHex, InputStream rawInStream,
boolean doLog) {
InputStream result = null;
try {
Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKey userKey = buildPasswordKey(algorithm, mDecryptPassword, userSalt,
rounds);
byte[] IV = hexToByteArray(userIvHex);
IvParameterSpec ivSpec = new IvParameterSpec(IV);
c.init(Cipher.DECRYPT_MODE,
new SecretKeySpec(userKey.getEncoded(), "AES"),
ivSpec);
byte[] mkCipher = hexToByteArray(masterKeyBlobHex);
byte[] mkBlob = c.doFinal(mkCipher);
// first, the master key IV
int offset = 0;
int len = mkBlob[offset++];
IV = Arrays.copyOfRange(mkBlob, offset, offset + len);
offset += len;
// then the master key itself
len = mkBlob[offset++];
byte[] mk = Arrays.copyOfRange(mkBlob,
offset, offset + len);
offset += len;
// and finally the master key checksum hash
len = mkBlob[offset++];
byte[] mkChecksum = Arrays.copyOfRange(mkBlob,
offset, offset + len);
// now validate the decrypted master key against the checksum
byte[] calculatedCk = makeKeyChecksum(algorithm, mk, ckSalt, rounds);
if (Arrays.equals(calculatedCk, mkChecksum)) {
ivSpec = new IvParameterSpec(IV);
c.init(Cipher.DECRYPT_MODE,
new SecretKeySpec(mk, "AES"),
ivSpec);
// Only if all of the above worked properly will 'result' be assigned
result = new CipherInputStream(rawInStream, c);
} else if (doLog) Slog.w(TAG, "Incorrect password");
} catch (InvalidAlgorithmParameterException e) {
if (doLog) Slog.e(TAG, "Needed parameter spec unavailable!", e);
} catch (BadPaddingException e) {
// This case frequently occurs when the wrong password is used to decrypt
// the master key. Use the identical "incorrect password" log text as is
// used in the checksum failure log in order to avoid providing additional
// information to an attacker.
if (doLog) Slog.w(TAG, "Incorrect password");
} catch (IllegalBlockSizeException e) {
if (doLog) Slog.w(TAG, "Invalid block size in master key");
} catch (NoSuchAlgorithmException e) {
if (doLog) Slog.e(TAG, "Needed decryption algorithm unavailable!");
} catch (NoSuchPaddingException e) {
if (doLog) Slog.e(TAG, "Needed padding mechanism unavailable!");
} catch (InvalidKeyException e) {
if (doLog) Slog.w(TAG, "Illegal password; aborting");
}
return result;
}
InputStream decodeAesHeaderAndInitialize(String encryptionName, boolean pbkdf2Fallback,
InputStream rawInStream) {
InputStream result = null;
try {
if (encryptionName.equals(ENCRYPTION_ALGORITHM_NAME)) {
String userSaltHex = readHeaderLine(rawInStream); // 5
byte[] userSalt = hexToByteArray(userSaltHex);
String ckSaltHex = readHeaderLine(rawInStream); // 6
byte[] ckSalt = hexToByteArray(ckSaltHex);
int rounds = Integer.parseInt(readHeaderLine(rawInStream)); // 7
String userIvHex = readHeaderLine(rawInStream); // 8
String masterKeyBlobHex = readHeaderLine(rawInStream); // 9
// decrypt the master key blob
result = attemptMasterKeyDecryption(PBKDF_CURRENT, userSalt, ckSalt,
rounds, userIvHex, masterKeyBlobHex, rawInStream, false);
if (result == null && pbkdf2Fallback) {
result = attemptMasterKeyDecryption(PBKDF_FALLBACK, userSalt, ckSalt,
rounds, userIvHex, masterKeyBlobHex, rawInStream, true);
}
} else Slog.w(TAG, "Unsupported encryption method: " + encryptionName);
} catch (NumberFormatException e) {
Slog.w(TAG, "Can't parse restore data header");
} catch (IOException e) {
Slog.w(TAG, "Can't read input header");
}
return result;
}
boolean restoreOneFile(InputStream instream, byte[] buffer) {
FileMetadata info;
try {
info = readTarHeaders(instream);
if (info != null) {
if (MORE_DEBUG) {
dumpFileMetadata(info);
}
final String pkg = info.packageName;
if (!pkg.equals(mAgentPackage)) {
// okay, change in package; set up our various
// bookkeeping if we haven't seen it yet
if (!mPackagePolicies.containsKey(pkg)) {
mPackagePolicies.put(pkg, RestorePolicy.IGNORE);
}
// Clean up the previous agent relationship if necessary,
// and let the observer know we're considering a new app.
if (mAgent != null) {
if (DEBUG) Slog.d(TAG, "Saw new package; tearing down old one");
tearDownPipes();
tearDownAgent(mTargetApp);
mTargetApp = null;
mAgentPackage = null;
}
}
if (info.path.equals(BACKUP_MANIFEST_FILENAME)) {
mPackagePolicies.put(pkg, readAppManifest(info, instream));
mPackageInstallers.put(pkg, info.installerPackageName);
// We've read only the manifest content itself at this point,
// so consume the footer before looping around to the next
// input file
skipTarPadding(info.size, instream);
sendOnRestorePackage(pkg);
} else {
// Non-manifest, so it's actual file data. Is this a package
// we're ignoring?
boolean okay = true;
RestorePolicy policy = mPackagePolicies.get(pkg);
switch (policy) {
case IGNORE:
okay = false;
break;
case ACCEPT_IF_APK:
// If we're in accept-if-apk state, then the first file we
// see MUST be the apk.
if (info.domain.equals(FullBackup.APK_TREE_TOKEN)) {
if (DEBUG) Slog.d(TAG, "APK file; installing");
// Try to install the app.
String installerName = mPackageInstallers.get(pkg);
okay = installApk(info, installerName, instream);
// good to go; promote to ACCEPT
mPackagePolicies.put(pkg, (okay)
? RestorePolicy.ACCEPT
: RestorePolicy.IGNORE);
// At this point we've consumed this file entry
// ourselves, so just strip the tar footer and
// go on to the next file in the input stream
skipTarPadding(info.size, instream);
return true;
} else {
// File data before (or without) the apk. We can't
// handle it coherently in this case so ignore it.
mPackagePolicies.put(pkg, RestorePolicy.IGNORE);
okay = false;
}
break;
case ACCEPT:
if (info.domain.equals(FullBackup.APK_TREE_TOKEN)) {
if (DEBUG) Slog.d(TAG, "apk present but ACCEPT");
// we can take the data without the apk, so we
// *want* to do so. skip the apk by declaring this
// one file not-okay without changing the restore
// policy for the package.
okay = false;
}
break;
default:
// Something has gone dreadfully wrong when determining
// the restore policy from the manifest. Ignore the
// rest of this package's data.
Slog.e(TAG, "Invalid policy from manifest");
okay = false;
mPackagePolicies.put(pkg, RestorePolicy.IGNORE);
break;
}
// If the policy is satisfied, go ahead and set up to pipe the
// data to the agent.
if (DEBUG && okay && mAgent != null) {
Slog.i(TAG, "Reusing existing agent instance");
}
if (okay && mAgent == null) {
if (DEBUG) Slog.d(TAG, "Need to launch agent for " + pkg);
try {
mTargetApp = mPackageManager.getApplicationInfo(pkg, 0);
// If we haven't sent any data to this app yet, we probably
// need to clear it first. Check that.
if (!mClearedPackages.contains(pkg)) {
// apps with their own backup agents are
// responsible for coherently managing a full
// restore.
if (mTargetApp.backupAgentName == null) {
if (DEBUG) Slog.d(TAG, "Clearing app data preparatory to full restore");
clearApplicationDataSynchronous(pkg);
} else {
if (DEBUG) Slog.d(TAG, "backup agent ("
+ mTargetApp.backupAgentName + ") => no clear");
}
mClearedPackages.add(pkg);
} else {
if (DEBUG) Slog.d(TAG, "We've initialized this app already; no clear required");
}
// All set; now set up the IPC and launch the agent
setUpPipes();
mAgent = bindToAgentSynchronous(mTargetApp,
IApplicationThread.BACKUP_MODE_RESTORE_FULL);
mAgentPackage = pkg;
} catch (IOException e) {
// fall through to error handling
} catch (NameNotFoundException e) {
// fall through to error handling
}
if (mAgent == null) {
if (DEBUG) Slog.d(TAG, "Unable to create agent for " + pkg);
okay = false;
tearDownPipes();
mPackagePolicies.put(pkg, RestorePolicy.IGNORE);
}
}
// Sanity check: make sure we never give data to the wrong app. This
// should never happen but a little paranoia here won't go amiss.
if (okay && !pkg.equals(mAgentPackage)) {
Slog.e(TAG, "Restoring data for " + pkg
+ " but agent is for " + mAgentPackage);
okay = false;
}
// At this point we have an agent ready to handle the full
// restore data as well as a pipe for sending data to
// that agent. Tell the agent to start reading from the
// pipe.
if (okay) {
boolean agentSuccess = true;
long toCopy = info.size;
final int token = generateToken();
try {
prepareOperationTimeout(token, TIMEOUT_FULL_BACKUP_INTERVAL, null);
if (info.domain.equals(FullBackup.OBB_TREE_TOKEN)) {
if (DEBUG) Slog.d(TAG, "Restoring OBB file for " + pkg
+ " : " + info.path);
mObbConnection.restoreObbFile(pkg, mPipes[0],
info.size, info.type, info.path, info.mode,
info.mtime, token, mBackupManagerBinder);
} else {
if (DEBUG) Slog.d(TAG, "Invoking agent to restore file "
+ info.path);
// fire up the app's agent listening on the socket. If
// the agent is running in the system process we can't
// just invoke it asynchronously, so we provide a thread
// for it here.
if (mTargetApp.processName.equals("system")) {
Slog.d(TAG, "system process agent - spinning a thread");
RestoreFileRunnable runner = new RestoreFileRunnable(
mAgent, info, mPipes[0], token);
new Thread(runner).start();
} else {
mAgent.doRestoreFile(mPipes[0], info.size, info.type,
info.domain, info.path, info.mode, info.mtime,
token, mBackupManagerBinder);
}
}
} catch (IOException e) {
// couldn't dup the socket for a process-local restore
Slog.d(TAG, "Couldn't establish restore");
agentSuccess = false;
okay = false;
} catch (RemoteException e) {
// whoops, remote entity went away. We'll eat the content
// ourselves, then, and not copy it over.
Slog.e(TAG, "Agent crashed during full restore");
agentSuccess = false;
okay = false;
}
// Copy over the data if the agent is still good
if (okay) {
boolean pipeOkay = true;
FileOutputStream pipe = new FileOutputStream(
mPipes[1].getFileDescriptor());
while (toCopy > 0) {
int toRead = (toCopy > buffer.length)
? buffer.length : (int)toCopy;
int nRead = instream.read(buffer, 0, toRead);
if (nRead >= 0) mBytes += nRead;
if (nRead <= 0) break;
toCopy -= nRead;
// send it to the output pipe as long as things
// are still good
if (pipeOkay) {
try {
pipe.write(buffer, 0, nRead);
} catch (IOException e) {
Slog.e(TAG, "Failed to write to restore pipe", e);
pipeOkay = false;
}
}
}
// done sending that file! Now we just need to consume
// the delta from info.size to the end of block.
skipTarPadding(info.size, instream);
// and now that we've sent it all, wait for the remote
// side to acknowledge receipt
agentSuccess = waitUntilOperationComplete(token);
}
// okay, if the remote end failed at any point, deal with
// it by ignoring the rest of the restore on it
if (!agentSuccess) {
mBackupHandler.removeMessages(MSG_TIMEOUT);
tearDownPipes();
tearDownAgent(mTargetApp);
mAgent = null;
mPackagePolicies.put(pkg, RestorePolicy.IGNORE);
}
}
// Problems setting up the agent communication, or an already-
// ignored package: skip to the next tar stream entry by
// reading and discarding this file.
if (!okay) {
if (DEBUG) Slog.d(TAG, "[discarding file content]");
long bytesToConsume = (info.size + 511) & ~511;
while (bytesToConsume > 0) {
int toRead = (bytesToConsume > buffer.length)
? buffer.length : (int)bytesToConsume;
long nRead = instream.read(buffer, 0, toRead);
if (nRead >= 0) mBytes += nRead;
if (nRead <= 0) break;
bytesToConsume -= nRead;
}
}
}
}
} catch (IOException e) {
if (DEBUG) Slog.w(TAG, "io exception on restore socket read", e);
// treat as EOF
info = null;
}
return (info != null);
}
void setUpPipes() throws IOException {
mPipes = ParcelFileDescriptor.createPipe();
}
void tearDownPipes() {
if (mPipes != null) {
try {
mPipes[0].close();
mPipes[0] = null;
mPipes[1].close();
mPipes[1] = null;
} catch (IOException e) {
Slog.w(TAG, "Couldn't close agent pipes", e);
}
mPipes = null;
}
}
void tearDownAgent(ApplicationInfo app) {
if (mAgent != null) {
try {
// unbind and tidy up even on timeout or failure, just in case
mActivityManager.unbindBackupAgent(app);
// The agent was running with a stub Application object, so shut it down.
// !!! We hardcode the confirmation UI's package name here rather than use a
// manifest flag! TODO something less direct.
if (app.uid != Process.SYSTEM_UID
&& !app.packageName.equals("com.android.backupconfirm")) {
if (DEBUG) Slog.d(TAG, "Killing host process");
mActivityManager.killApplicationProcess(app.processName, app.uid);
} else {
if (DEBUG) Slog.d(TAG, "Not killing after full restore");
}
} catch (RemoteException e) {
Slog.d(TAG, "Lost app trying to shut down");
}
mAgent = null;
}
}
class RestoreInstallObserver extends IPackageInstallObserver.Stub {
final AtomicBoolean mDone = new AtomicBoolean();
String mPackageName;
int mResult;
public void reset() {
synchronized (mDone) {
mDone.set(false);
}
}
public void waitForCompletion() {
synchronized (mDone) {
while (mDone.get() == false) {
try {
mDone.wait();
} catch (InterruptedException e) { }
}
}
}
int getResult() {
return mResult;
}
@Override
public void packageInstalled(String packageName, int returnCode)
throws RemoteException {
synchronized (mDone) {
mResult = returnCode;
mPackageName = packageName;
mDone.set(true);
mDone.notifyAll();
}
}
}
class RestoreDeleteObserver extends IPackageDeleteObserver.Stub {
final AtomicBoolean mDone = new AtomicBoolean();
int mResult;
public void reset() {
synchronized (mDone) {
mDone.set(false);
}
}
public void waitForCompletion() {
synchronized (mDone) {
while (mDone.get() == false) {
try {
mDone.wait();
} catch (InterruptedException e) { }
}
}
}
@Override
public void packageDeleted(String packageName, int returnCode) throws RemoteException {
synchronized (mDone) {
mResult = returnCode;
mDone.set(true);
mDone.notifyAll();
}
}
}
final RestoreInstallObserver mInstallObserver = new RestoreInstallObserver();
final RestoreDeleteObserver mDeleteObserver = new RestoreDeleteObserver();
boolean installApk(FileMetadata info, String installerPackage, InputStream instream) {
boolean okay = true;
if (DEBUG) Slog.d(TAG, "Installing from backup: " + info.packageName);
// The file content is an .apk file. Copy it out to a staging location and
// attempt to install it.
File apkFile = new File(mDataDir, info.packageName);
try {
FileOutputStream apkStream = new FileOutputStream(apkFile);
byte[] buffer = new byte[32 * 1024];
long size = info.size;
while (size > 0) {
long toRead = (buffer.length < size) ? buffer.length : size;
int didRead = instream.read(buffer, 0, (int)toRead);
if (didRead >= 0) mBytes += didRead;
apkStream.write(buffer, 0, didRead);
size -= didRead;
}
apkStream.close();
// make sure the installer can read it
apkFile.setReadable(true, false);
// Now install it
Uri packageUri = Uri.fromFile(apkFile);
mInstallObserver.reset();
mPackageManager.installPackage(packageUri, mInstallObserver,
PackageManager.INSTALL_REPLACE_EXISTING | PackageManager.INSTALL_FROM_ADB,
installerPackage);
mInstallObserver.waitForCompletion();
if (mInstallObserver.getResult() != PackageManager.INSTALL_SUCCEEDED) {
// The only time we continue to accept install of data even if the
// apk install failed is if we had already determined that we could
// accept the data regardless.
if (mPackagePolicies.get(info.packageName) != RestorePolicy.ACCEPT) {
okay = false;
}
} else {
// Okay, the install succeeded. Make sure it was the right app.
boolean uninstall = false;
if (!mInstallObserver.mPackageName.equals(info.packageName)) {
Slog.w(TAG, "Restore stream claimed to include apk for "
+ info.packageName + " but apk was really "
+ mInstallObserver.mPackageName);
// delete the package we just put in place; it might be fraudulent
okay = false;
uninstall = true;
} else {
try {
PackageInfo pkg = mPackageManager.getPackageInfo(info.packageName,
PackageManager.GET_SIGNATURES);
if ((pkg.applicationInfo.flags & ApplicationInfo.FLAG_ALLOW_BACKUP) == 0) {
Slog.w(TAG, "Restore stream contains apk of package "
+ info.packageName + " but it disallows backup/restore");
okay = false;
} else {
// So far so good -- do the signatures match the manifest?
Signature[] sigs = mManifestSignatures.get(info.packageName);
if (signaturesMatch(sigs, pkg)) {
// If this is a system-uid app without a declared backup agent,
// don't restore any of the file data.
if ((pkg.applicationInfo.uid < Process.FIRST_APPLICATION_UID)
&& (pkg.applicationInfo.backupAgentName == null)) {
Slog.w(TAG, "Installed app " + info.packageName
+ " has restricted uid and no agent");
okay = false;
}
} else {
Slog.w(TAG, "Installed app " + info.packageName
+ " signatures do not match restore manifest");
okay = false;
uninstall = true;
}
}
} catch (NameNotFoundException e) {
Slog.w(TAG, "Install of package " + info.packageName
+ " succeeded but now not found");
okay = false;
}
}
// If we're not okay at this point, we need to delete the package
// that we just installed.
if (uninstall) {
mDeleteObserver.reset();
mPackageManager.deletePackage(mInstallObserver.mPackageName,
mDeleteObserver, 0);
mDeleteObserver.waitForCompletion();
}
}
} catch (IOException e) {
Slog.e(TAG, "Unable to transcribe restored apk for install");
okay = false;
} finally {
apkFile.delete();
}
return okay;
}
// Given an actual file content size, consume the post-content padding mandated
// by the tar format.
void skipTarPadding(long size, InputStream instream) throws IOException {
long partial = (size + 512) % 512;
if (partial > 0) {
final int needed = 512 - (int)partial;
byte[] buffer = new byte[needed];
if (readExactly(instream, buffer, 0, needed) == needed) {
mBytes += needed;
} else throw new IOException("Unexpected EOF in padding");
}
}
// Returns a policy constant; takes a buffer arg to reduce memory churn
RestorePolicy readAppManifest(FileMetadata info, InputStream instream)
throws IOException {
// Fail on suspiciously large manifest files
if (info.size > 64 * 1024) {
throw new IOException("Restore manifest too big; corrupt? size=" + info.size);
}
byte[] buffer = new byte[(int) info.size];
if (readExactly(instream, buffer, 0, (int)info.size) == info.size) {
mBytes += info.size;
} else throw new IOException("Unexpected EOF in manifest");
RestorePolicy policy = RestorePolicy.IGNORE;
String[] str = new String[1];
int offset = 0;
try {
offset = extractLine(buffer, offset, str);
int version = Integer.parseInt(str[0]);
if (version == BACKUP_MANIFEST_VERSION) {
offset = extractLine(buffer, offset, str);
String manifestPackage = str[0];
// TODO: handle <original-package>
if (manifestPackage.equals(info.packageName)) {
offset = extractLine(buffer, offset, str);
version = Integer.parseInt(str[0]); // app version
offset = extractLine(buffer, offset, str);
int platformVersion = Integer.parseInt(str[0]);
offset = extractLine(buffer, offset, str);
info.installerPackageName = (str[0].length() > 0) ? str[0] : null;
offset = extractLine(buffer, offset, str);
boolean hasApk = str[0].equals("1");
offset = extractLine(buffer, offset, str);
int numSigs = Integer.parseInt(str[0]);
if (numSigs > 0) {
Signature[] sigs = new Signature[numSigs];
for (int i = 0; i < numSigs; i++) {
offset = extractLine(buffer, offset, str);
sigs[i] = new Signature(str[0]);
}
mManifestSignatures.put(info.packageName, sigs);
// Okay, got the manifest info we need...
try {
PackageInfo pkgInfo = mPackageManager.getPackageInfo(
info.packageName, PackageManager.GET_SIGNATURES);
// Fall through to IGNORE if the app explicitly disallows backup
final int flags = pkgInfo.applicationInfo.flags;
if ((flags & ApplicationInfo.FLAG_ALLOW_BACKUP) != 0) {
// Restore system-uid-space packages only if they have
// defined a custom backup agent
if ((pkgInfo.applicationInfo.uid >= Process.FIRST_APPLICATION_UID)
|| (pkgInfo.applicationInfo.backupAgentName != null)) {
// Verify signatures against any installed version; if they
// don't match, then we fall though and ignore the data. The
// signatureMatch() method explicitly ignores the signature
// check for packages installed on the system partition, because
// such packages are signed with the platform cert instead of
// the app developer's cert, so they're different on every
// device.
if (signaturesMatch(sigs, pkgInfo)) {
if (pkgInfo.versionCode >= version) {
Slog.i(TAG, "Sig + version match; taking data");
policy = RestorePolicy.ACCEPT;
} else {
// The data is from a newer version of the app than
// is presently installed. That means we can only
// use it if the matching apk is also supplied.
Slog.d(TAG, "Data version " + version
+ " is newer than installed version "
+ pkgInfo.versionCode + " - requiring apk");
policy = RestorePolicy.ACCEPT_IF_APK;
}
} else {
Slog.w(TAG, "Restore manifest signatures do not match "
+ "installed application for " + info.packageName);
}
} else {
Slog.w(TAG, "Package " + info.packageName
+ " is system level with no agent");
}
} else {
if (DEBUG) Slog.i(TAG, "Restore manifest from "
+ info.packageName + " but allowBackup=false");
}
} catch (NameNotFoundException e) {
// Okay, the target app isn't installed. We can process
// the restore properly only if the dataset provides the
// apk file and we can successfully install it.
if (DEBUG) Slog.i(TAG, "Package " + info.packageName
+ " not installed; requiring apk in dataset");
policy = RestorePolicy.ACCEPT_IF_APK;
}
if (policy == RestorePolicy.ACCEPT_IF_APK && !hasApk) {
Slog.i(TAG, "Cannot restore package " + info.packageName
+ " without the matching .apk");
}
} else {
Slog.i(TAG, "Missing signature on backed-up package "
+ info.packageName);
}
} else {
Slog.i(TAG, "Expected package " + info.packageName
+ " but restore manifest claims " + manifestPackage);
}
} else {
Slog.i(TAG, "Unknown restore manifest version " + version
+ " for package " + info.packageName);
}
} catch (NumberFormatException e) {
Slog.w(TAG, "Corrupt restore manifest for package " + info.packageName);
} catch (IllegalArgumentException e) {
Slog.w(TAG, e.getMessage());
}
return policy;
}
// Builds a line from a byte buffer starting at 'offset', and returns
// the index of the next unconsumed data in the buffer.
int extractLine(byte[] buffer, int offset, String[] outStr) throws IOException {
final int end = buffer.length;
if (offset >= end) throw new IOException("Incomplete data");
int pos;
for (pos = offset; pos < end; pos++) {
byte c = buffer[pos];
// at LF we declare end of line, and return the next char as the
// starting point for the next time through
if (c == '\n') {
break;
}
}
outStr[0] = new String(buffer, offset, pos - offset);
pos++; // may be pointing an extra byte past the end but that's okay
return pos;
}
void dumpFileMetadata(FileMetadata info) {
if (DEBUG) {
StringBuilder b = new StringBuilder(128);
// mode string
b.append((info.type == BackupAgent.TYPE_DIRECTORY) ? 'd' : '-');
b.append(((info.mode & 0400) != 0) ? 'r' : '-');
b.append(((info.mode & 0200) != 0) ? 'w' : '-');
b.append(((info.mode & 0100) != 0) ? 'x' : '-');
b.append(((info.mode & 0040) != 0) ? 'r' : '-');
b.append(((info.mode & 0020) != 0) ? 'w' : '-');
b.append(((info.mode & 0010) != 0) ? 'x' : '-');
b.append(((info.mode & 0004) != 0) ? 'r' : '-');
b.append(((info.mode & 0002) != 0) ? 'w' : '-');
b.append(((info.mode & 0001) != 0) ? 'x' : '-');
b.append(String.format(" %9d ", info.size));
Date stamp = new Date(info.mtime);
b.append(new SimpleDateFormat("MMM dd HH:mm:ss ").format(stamp));
b.append(info.packageName);
b.append(" :: ");
b.append(info.domain);
b.append(" :: ");
b.append(info.path);
Slog.i(TAG, b.toString());
}
}
// Consume a tar file header block [sequence] and accumulate the relevant metadata
FileMetadata readTarHeaders(InputStream instream) throws IOException {
byte[] block = new byte[512];
FileMetadata info = null;
boolean gotHeader = readTarHeader(instream, block);
if (gotHeader) {
try {
// okay, presume we're okay, and extract the various metadata
info = new FileMetadata();
info.size = extractRadix(block, 124, 12, 8);
info.mtime = extractRadix(block, 136, 12, 8);
info.mode = extractRadix(block, 100, 8, 8);
info.path = extractString(block, 345, 155); // prefix
String path = extractString(block, 0, 100);
if (path.length() > 0) {
if (info.path.length() > 0) info.path += '/';
info.path += path;
}
// tar link indicator field: 1 byte at offset 156 in the header.
int typeChar = block[156];
if (typeChar == 'x') {
// pax extended header, so we need to read that
gotHeader = readPaxExtendedHeader(instream, info);
if (gotHeader) {
// and after a pax extended header comes another real header -- read
// that to find the real file type
gotHeader = readTarHeader(instream, block);
}
if (!gotHeader) throw new IOException("Bad or missing pax header");
typeChar = block[156];
}
switch (typeChar) {
case '0': info.type = BackupAgent.TYPE_FILE; break;
case '5': {
info.type = BackupAgent.TYPE_DIRECTORY;
if (info.size != 0) {
Slog.w(TAG, "Directory entry with nonzero size in header");
info.size = 0;
}
break;
}
case 0: {
// presume EOF
if (DEBUG) Slog.w(TAG, "Saw type=0 in tar header block, info=" + info);
return null;
}
default: {
Slog.e(TAG, "Unknown tar entity type: " + typeChar);
throw new IOException("Unknown entity type " + typeChar);
}
}
// Parse out the path
//
// first: apps/shared/unrecognized
if (FullBackup.SHARED_PREFIX.regionMatches(0,
info.path, 0, FullBackup.SHARED_PREFIX.length())) {
// File in shared storage. !!! TODO: implement this.
info.path = info.path.substring(FullBackup.SHARED_PREFIX.length());
info.packageName = SHARED_BACKUP_AGENT_PACKAGE;
info.domain = FullBackup.SHARED_STORAGE_TOKEN;
if (DEBUG) Slog.i(TAG, "File in shared storage: " + info.path);
} else if (FullBackup.APPS_PREFIX.regionMatches(0,
info.path, 0, FullBackup.APPS_PREFIX.length())) {
// App content! Parse out the package name and domain
// strip the apps/ prefix
info.path = info.path.substring(FullBackup.APPS_PREFIX.length());
// extract the package name
int slash = info.path.indexOf('/');
if (slash < 0) throw new IOException("Illegal semantic path in " + info.path);
info.packageName = info.path.substring(0, slash);
info.path = info.path.substring(slash+1);
// if it's a manifest we're done, otherwise parse out the domains
if (!info.path.equals(BACKUP_MANIFEST_FILENAME)) {
slash = info.path.indexOf('/');
if (slash < 0) throw new IOException("Illegal semantic path in non-manifest " + info.path);
info.domain = info.path.substring(0, slash);
info.path = info.path.substring(slash + 1);
}
}
} catch (IOException e) {
if (DEBUG) {
Slog.e(TAG, "Parse error in header: " + e.getMessage());
HEXLOG(block);
}
throw e;
}
}
return info;
}
private void HEXLOG(byte[] block) {
int offset = 0;
int todo = block.length;
StringBuilder buf = new StringBuilder(64);
while (todo > 0) {
buf.append(String.format("%04x ", offset));
int numThisLine = (todo > 16) ? 16 : todo;
for (int i = 0; i < numThisLine; i++) {
buf.append(String.format("%02x ", block[offset+i]));
}
Slog.i("hexdump", buf.toString());
buf.setLength(0);
todo -= numThisLine;
offset += numThisLine;
}
}
// Read exactly the given number of bytes into a buffer at the stated offset.
// Returns false if EOF is encountered before the requested number of bytes
// could be read.
int readExactly(InputStream in, byte[] buffer, int offset, int size)
throws IOException {
if (size <= 0) throw new IllegalArgumentException("size must be > 0");
int soFar = 0;
while (soFar < size) {
int nRead = in.read(buffer, offset + soFar, size - soFar);
if (nRead <= 0) {
if (MORE_DEBUG) Slog.w(TAG, "- wanted exactly " + size + " but got only " + soFar);
break;
}
soFar += nRead;
}
return soFar;
}
boolean readTarHeader(InputStream instream, byte[] block) throws IOException {
final int got = readExactly(instream, block, 0, 512);
if (got == 0) return false; // Clean EOF
if (got < 512) throw new IOException("Unable to read full block header");
mBytes += 512;
return true;
}
// overwrites 'info' fields based on the pax extended header
boolean readPaxExtendedHeader(InputStream instream, FileMetadata info)
throws IOException {
// We should never see a pax extended header larger than this
if (info.size > 32*1024) {
Slog.w(TAG, "Suspiciously large pax header size " + info.size
+ " - aborting");
throw new IOException("Sanity failure: pax header size " + info.size);
}
// read whole blocks, not just the content size
int numBlocks = (int)((info.size + 511) >> 9);
byte[] data = new byte[numBlocks * 512];
if (readExactly(instream, data, 0, data.length) < data.length) {
throw new IOException("Unable to read full pax header");
}
mBytes += data.length;
final int contentSize = (int) info.size;
int offset = 0;
do {
// extract the line at 'offset'
int eol = offset+1;
while (eol < contentSize && data[eol] != ' ') eol++;
if (eol >= contentSize) {
// error: we just hit EOD looking for the end of the size field
throw new IOException("Invalid pax data");
}
// eol points to the space between the count and the key
int linelen = (int) extractRadix(data, offset, eol - offset, 10);
int key = eol + 1; // start of key=value
eol = offset + linelen - 1; // trailing LF
int value;
for (value = key+1; data[value] != '=' && value <= eol; value++);
if (value > eol) {
throw new IOException("Invalid pax declaration");
}
// pax requires that key/value strings be in UTF-8
String keyStr = new String(data, key, value-key, "UTF-8");
// -1 to strip the trailing LF
String valStr = new String(data, value+1, eol-value-1, "UTF-8");
if ("path".equals(keyStr)) {
info.path = valStr;
} else if ("size".equals(keyStr)) {
info.size = Long.parseLong(valStr);
} else {
if (DEBUG) Slog.i(TAG, "Unhandled pax key: " + key);
}
offset += linelen;
} while (offset < contentSize);
return true;
}
long extractRadix(byte[] data, int offset, int maxChars, int radix)
throws IOException {
long value = 0;
final int end = offset + maxChars;
for (int i = offset; i < end; i++) {
final byte b = data[i];
// Numeric fields in tar can terminate with either NUL or SPC
if (b == 0 || b == ' ') break;
if (b < '0' || b > ('0' + radix - 1)) {
throw new IOException("Invalid number in header: '" + (char)b + "' for radix " + radix);
}
value = radix * value + (b - '0');
}
return value;
}
String extractString(byte[] data, int offset, int maxChars) throws IOException {
final int end = offset + maxChars;
int eos = offset;
// tar string fields terminate early with a NUL
while (eos < end && data[eos] != 0) eos++;
return new String(data, offset, eos-offset, "US-ASCII");
}
void sendStartRestore() {
if (mObserver != null) {
try {
mObserver.onStartRestore();
} catch (RemoteException e) {
Slog.w(TAG, "full restore observer went away: startRestore");
mObserver = null;
}
}
}
void sendOnRestorePackage(String name) {
if (mObserver != null) {
try {
// TODO: use a more user-friendly name string
mObserver.onRestorePackage(name);
} catch (RemoteException e) {
Slog.w(TAG, "full restore observer went away: restorePackage");
mObserver = null;
}
}
}
void sendEndRestore() {
if (mObserver != null) {
try {
mObserver.onEndRestore();
} catch (RemoteException e) {
Slog.w(TAG, "full restore observer went away: endRestore");
mObserver = null;
}
}
}
}
// ----- Restore handling -----
private boolean signaturesMatch(Signature[] storedSigs, PackageInfo target) {
// If the target resides on the system partition, we allow it to restore
// data from the like-named package in a restore set even if the signatures
// do not match. (Unlike general applications, those flashed to the system
// partition will be signed with the device's platform certificate, so on
// different phones the same system app will have different signatures.)
if ((target.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
if (DEBUG) Slog.v(TAG, "System app " + target.packageName + " - skipping sig check");
return true;
}
// Allow unsigned apps, but not signed on one device and unsigned on the other
// !!! TODO: is this the right policy?
Signature[] deviceSigs = target.signatures;
if (MORE_DEBUG) Slog.v(TAG, "signaturesMatch(): stored=" + storedSigs
+ " device=" + deviceSigs);
if ((storedSigs == null || storedSigs.length == 0)
&& (deviceSigs == null || deviceSigs.length == 0)) {
return true;
}
if (storedSigs == null || deviceSigs == null) {
return false;
}
// !!! TODO: this demands that every stored signature match one
// that is present on device, and does not demand the converse.
// Is this this right policy?
int nStored = storedSigs.length;
int nDevice = deviceSigs.length;
for (int i=0; i < nStored; i++) {
boolean match = false;
for (int j=0; j < nDevice; j++) {
if (storedSigs[i].equals(deviceSigs[j])) {
match = true;
break;
}
}
if (!match) {
return false;
}
}
return true;
}
enum RestoreState {
INITIAL,
DOWNLOAD_DATA,
PM_METADATA,
RUNNING_QUEUE,
FINAL
}
class PerformRestoreTask implements BackupRestoreTask {
private IBackupTransport mTransport;
private IRestoreObserver mObserver;
private long mToken;
private PackageInfo mTargetPackage;
private File mStateDir;
private int mPmToken;
private boolean mNeedFullBackup;
private HashSet<String> mFilterSet;
private long mStartRealtime;
private PackageManagerBackupAgent mPmAgent;
private List<PackageInfo> mAgentPackages;
private ArrayList<PackageInfo> mRestorePackages;
private RestoreState mCurrentState;
private int mCount;
private boolean mFinished;
private int mStatus;
private File mBackupDataName;
private File mNewStateName;
private File mSavedStateName;
private ParcelFileDescriptor mBackupData;
private ParcelFileDescriptor mNewState;
private PackageInfo mCurrentPackage;
class RestoreRequest {
public PackageInfo app;
public int storedAppVersion;
RestoreRequest(PackageInfo _app, int _version) {
app = _app;
storedAppVersion = _version;
}
}
PerformRestoreTask(IBackupTransport transport, String dirName, IRestoreObserver observer,
long restoreSetToken, PackageInfo targetPackage, int pmToken,
boolean needFullBackup, String[] filterSet) {
mCurrentState = RestoreState.INITIAL;
mFinished = false;
mPmAgent = null;
mTransport = transport;
mObserver = observer;
mToken = restoreSetToken;
mTargetPackage = targetPackage;
mPmToken = pmToken;
mNeedFullBackup = needFullBackup;
if (filterSet != null) {
mFilterSet = new HashSet<String>();
for (String pkg : filterSet) {
mFilterSet.add(pkg);
}
} else {
mFilterSet = null;
}
mStateDir = new File(mBaseStateDir, dirName);
}
// Execute one tick of whatever state machine the task implements
@Override
public void execute() {
if (MORE_DEBUG) Slog.v(TAG, "*** Executing restore step: " + mCurrentState);
switch (mCurrentState) {
case INITIAL:
beginRestore();
break;
case DOWNLOAD_DATA:
downloadRestoreData();
break;
case PM_METADATA:
restorePmMetadata();
break;
case RUNNING_QUEUE:
restoreNextAgent();
break;
case FINAL:
if (!mFinished) finalizeRestore();
else {
Slog.e(TAG, "Duplicate finish");
}
mFinished = true;
break;
}
}
// Initialize and set up for the PM metadata restore, which comes first
void beginRestore() {
// Don't account time doing the restore as inactivity of the app
// that has opened a restore session.
mBackupHandler.removeMessages(MSG_RESTORE_TIMEOUT);
// Assume error until we successfully init everything
mStatus = BackupConstants.TRANSPORT_ERROR;
try {
// TODO: Log this before getAvailableRestoreSets, somehow
EventLog.writeEvent(EventLogTags.RESTORE_START, mTransport.transportDirName(), mToken);
// Get the list of all packages which have backup enabled.
// (Include the Package Manager metadata pseudo-package first.)
mRestorePackages = new ArrayList<PackageInfo>();
PackageInfo omPackage = new PackageInfo();
omPackage.packageName = PACKAGE_MANAGER_SENTINEL;
mRestorePackages.add(omPackage);
mAgentPackages = allAgentPackages();
if (mTargetPackage == null) {
// if there's a filter set, strip out anything that isn't
// present before proceeding
if (mFilterSet != null) {
for (int i = mAgentPackages.size() - 1; i >= 0; i--) {
final PackageInfo pkg = mAgentPackages.get(i);
if (! mFilterSet.contains(pkg.packageName)) {
mAgentPackages.remove(i);
}
}
if (MORE_DEBUG) {
Slog.i(TAG, "Post-filter package set for restore:");
for (PackageInfo p : mAgentPackages) {
Slog.i(TAG, " " + p);
}
}
}
mRestorePackages.addAll(mAgentPackages);
} else {
// Just one package to attempt restore of
mRestorePackages.add(mTargetPackage);
}
// let the observer know that we're running
if (mObserver != null) {
try {
// !!! TODO: get an actual count from the transport after
// its startRestore() runs?
mObserver.restoreStarting(mRestorePackages.size());
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died at restoreStarting");
mObserver = null;
}
}
} catch (RemoteException e) {
// Something has gone catastrophically wrong with the transport
Slog.e(TAG, "Error communicating with transport for restore");
executeNextState(RestoreState.FINAL);
return;
}
mStatus = BackupConstants.TRANSPORT_OK;
executeNextState(RestoreState.DOWNLOAD_DATA);
}
void downloadRestoreData() {
// Note that the download phase can be very time consuming, but we're executing
// it inline here on the looper. This is "okay" because it is not calling out to
// third party code; the transport is "trusted," and so we assume it is being a
// good citizen and timing out etc when appropriate.
//
// TODO: when appropriate, move the download off the looper and rearrange the
// error handling around that.
try {
mStatus = mTransport.startRestore(mToken,
mRestorePackages.toArray(new PackageInfo[0]));
if (mStatus != BackupConstants.TRANSPORT_OK) {
Slog.e(TAG, "Error starting restore operation");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
executeNextState(RestoreState.FINAL);
return;
}
} catch (RemoteException e) {
Slog.e(TAG, "Error communicating with transport for restore");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
mStatus = BackupConstants.TRANSPORT_ERROR;
executeNextState(RestoreState.FINAL);
return;
}
// Successful download of the data to be parceled out to the apps, so off we go.
executeNextState(RestoreState.PM_METADATA);
}
void restorePmMetadata() {
try {
String packageName = mTransport.nextRestorePackage();
if (packageName == null) {
Slog.e(TAG, "Error getting first restore package");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
mStatus = BackupConstants.TRANSPORT_ERROR;
executeNextState(RestoreState.FINAL);
return;
} else if (packageName.equals("")) {
Slog.i(TAG, "No restore data available");
int millis = (int) (SystemClock.elapsedRealtime() - mStartRealtime);
EventLog.writeEvent(EventLogTags.RESTORE_SUCCESS, 0, millis);
mStatus = BackupConstants.TRANSPORT_OK;
executeNextState(RestoreState.FINAL);
return;
} else if (!packageName.equals(PACKAGE_MANAGER_SENTINEL)) {
Slog.e(TAG, "Expected restore data for \"" + PACKAGE_MANAGER_SENTINEL
+ "\", found only \"" + packageName + "\"");
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, PACKAGE_MANAGER_SENTINEL,
"Package manager data missing");
executeNextState(RestoreState.FINAL);
return;
}
// Pull the Package Manager metadata from the restore set first
PackageInfo omPackage = new PackageInfo();
omPackage.packageName = PACKAGE_MANAGER_SENTINEL;
mPmAgent = new PackageManagerBackupAgent(
mPackageManager, mAgentPackages);
initiateOneRestore(omPackage, 0, IBackupAgent.Stub.asInterface(mPmAgent.onBind()),
mNeedFullBackup);
// The PM agent called operationComplete() already, because our invocation
// of it is process-local and therefore synchronous. That means that a
// RUNNING_QUEUE message is already enqueued. Only if we're unable to
// proceed with running the queue do we remove that pending message and
// jump straight to the FINAL state.
// Verify that the backup set includes metadata. If not, we can't do
// signature/version verification etc, so we simply do not proceed with
// the restore operation.
if (!mPmAgent.hasMetadata()) {
Slog.e(TAG, "No restore metadata available, so not restoring settings");
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, PACKAGE_MANAGER_SENTINEL,
"Package manager restore metadata missing");
mStatus = BackupConstants.TRANSPORT_ERROR;
mBackupHandler.removeMessages(MSG_BACKUP_RESTORE_STEP, this);
executeNextState(RestoreState.FINAL);
return;
}
} catch (RemoteException e) {
Slog.e(TAG, "Error communicating with transport for restore");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
mStatus = BackupConstants.TRANSPORT_ERROR;
mBackupHandler.removeMessages(MSG_BACKUP_RESTORE_STEP, this);
executeNextState(RestoreState.FINAL);
return;
}
// Metadata is intact, so we can now run the restore queue. If we get here,
// we have already enqueued the necessary next-step message on the looper.
}
void restoreNextAgent() {
try {
String packageName = mTransport.nextRestorePackage();
if (packageName == null) {
Slog.e(TAG, "Error getting next restore package");
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
executeNextState(RestoreState.FINAL);
return;
} else if (packageName.equals("")) {
if (DEBUG) Slog.v(TAG, "No next package, finishing restore");
int millis = (int) (SystemClock.elapsedRealtime() - mStartRealtime);
EventLog.writeEvent(EventLogTags.RESTORE_SUCCESS, mCount, millis);
executeNextState(RestoreState.FINAL);
return;
}
if (mObserver != null) {
try {
mObserver.onUpdate(mCount, packageName);
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died in onUpdate");
mObserver = null;
}
}
Metadata metaInfo = mPmAgent.getRestoredMetadata(packageName);
if (metaInfo == null) {
Slog.e(TAG, "Missing metadata for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Package metadata missing");
executeNextState(RestoreState.RUNNING_QUEUE);
return;
}
PackageInfo packageInfo;
try {
int flags = PackageManager.GET_SIGNATURES;
packageInfo = mPackageManager.getPackageInfo(packageName, flags);
} catch (NameNotFoundException e) {
Slog.e(TAG, "Invalid package restoring data", e);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Package missing on device");
executeNextState(RestoreState.RUNNING_QUEUE);
return;
}
if (packageInfo.applicationInfo.backupAgentName == null
|| "".equals(packageInfo.applicationInfo.backupAgentName)) {
if (DEBUG) {
Slog.i(TAG, "Data exists for package " + packageName
+ " but app has no agent; skipping");
}
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Package has no agent");
executeNextState(RestoreState.RUNNING_QUEUE);
return;
}
if (metaInfo.versionCode > packageInfo.versionCode) {
// Data is from a "newer" version of the app than we have currently
// installed. If the app has not declared that it is prepared to
// handle this case, we do not attempt the restore.
if ((packageInfo.applicationInfo.flags
& ApplicationInfo.FLAG_RESTORE_ANY_VERSION) == 0) {
String message = "Version " + metaInfo.versionCode
+ " > installed version " + packageInfo.versionCode;
Slog.w(TAG, "Package " + packageName + ": " + message);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE,
packageName, message);
executeNextState(RestoreState.RUNNING_QUEUE);
return;
} else {
if (DEBUG) Slog.v(TAG, "Version " + metaInfo.versionCode
+ " > installed " + packageInfo.versionCode
+ " but restoreAnyVersion");
}
}
if (!signaturesMatch(metaInfo.signatures, packageInfo)) {
Slog.w(TAG, "Signature mismatch restoring " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Signature mismatch");
executeNextState(RestoreState.RUNNING_QUEUE);
return;
}
if (DEBUG) Slog.v(TAG, "Package " + packageName
+ " restore version [" + metaInfo.versionCode
+ "] is compatible with installed version ["
+ packageInfo.versionCode + "]");
// Then set up and bind the agent
IBackupAgent agent = bindToAgentSynchronous(
packageInfo.applicationInfo,
IApplicationThread.BACKUP_MODE_INCREMENTAL);
if (agent == null) {
Slog.w(TAG, "Can't find backup agent for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName,
"Restore agent missing");
executeNextState(RestoreState.RUNNING_QUEUE);
return;
}
// And then finally start the restore on this agent
try {
initiateOneRestore(packageInfo, metaInfo.versionCode, agent, mNeedFullBackup);
++mCount;
} catch (Exception e) {
Slog.e(TAG, "Error when attempting restore: " + e.toString());
agentErrorCleanup();
executeNextState(RestoreState.RUNNING_QUEUE);
}
} catch (RemoteException e) {
Slog.e(TAG, "Unable to fetch restore data from transport");
mStatus = BackupConstants.TRANSPORT_ERROR;
executeNextState(RestoreState.FINAL);
}
}
void finalizeRestore() {
if (MORE_DEBUG) Slog.d(TAG, "finishing restore mObserver=" + mObserver);
try {
mTransport.finishRestore();
} catch (RemoteException e) {
Slog.e(TAG, "Error finishing restore", e);
}
if (mObserver != null) {
try {
mObserver.restoreFinished(mStatus);
} catch (RemoteException e) {
Slog.d(TAG, "Restore observer died at restoreFinished");
}
}
// If this was a restoreAll operation, record that this was our
// ancestral dataset, as well as the set of apps that are possibly
// restoreable from the dataset
if (mTargetPackage == null && mPmAgent != null) {
mAncestralPackages = mPmAgent.getRestoredPackages();
mAncestralToken = mToken;
writeRestoreTokens();
}
// We must under all circumstances tell the Package Manager to
// proceed with install notifications if it's waiting for us.
if (mPmToken > 0) {
if (MORE_DEBUG) Slog.v(TAG, "finishing PM token " + mPmToken);
try {
mPackageManagerBinder.finishPackageInstall(mPmToken);
} catch (RemoteException e) { /* can't happen */ }
}
// Furthermore we need to reset the session timeout clock
mBackupHandler.removeMessages(MSG_RESTORE_TIMEOUT);
mBackupHandler.sendEmptyMessageDelayed(MSG_RESTORE_TIMEOUT,
TIMEOUT_RESTORE_INTERVAL);
// done; we can finally release the wakelock
Slog.i(TAG, "Restore complete.");
mWakelock.release();
}
// Call asynchronously into the app, passing it the restore data. The next step
// after this is always a callback, either operationComplete() or handleTimeout().
void initiateOneRestore(PackageInfo app, int appVersionCode, IBackupAgent agent,
boolean needFullBackup) {
mCurrentPackage = app;
final String packageName = app.packageName;
if (DEBUG) Slog.d(TAG, "initiateOneRestore packageName=" + packageName);
// !!! TODO: get the dirs from the transport
mBackupDataName = new File(mDataDir, packageName + ".restore");
mNewStateName = new File(mStateDir, packageName + ".new");
mSavedStateName = new File(mStateDir, packageName);
final int token = generateToken();
try {
// Run the transport's restore pass
mBackupData = ParcelFileDescriptor.open(mBackupDataName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
if (!SELinux.restorecon(mBackupDataName)) {
Slog.e(TAG, "SElinux restorecon failed for " + mBackupDataName);
}
if (mTransport.getRestoreData(mBackupData) != BackupConstants.TRANSPORT_OK) {
// Transport-level failure, so we wind everything up and
// terminate the restore operation.
Slog.e(TAG, "Error getting restore data for " + packageName);
EventLog.writeEvent(EventLogTags.RESTORE_TRANSPORT_FAILURE);
mBackupData.close();
mBackupDataName.delete();
executeNextState(RestoreState.FINAL);
return;
}
// Okay, we have the data. Now have the agent do the restore.
mBackupData.close();
mBackupData = ParcelFileDescriptor.open(mBackupDataName,
ParcelFileDescriptor.MODE_READ_ONLY);
mNewState = ParcelFileDescriptor.open(mNewStateName,
ParcelFileDescriptor.MODE_READ_WRITE |
ParcelFileDescriptor.MODE_CREATE |
ParcelFileDescriptor.MODE_TRUNCATE);
// Kick off the restore, checking for hung agents
prepareOperationTimeout(token, TIMEOUT_RESTORE_INTERVAL, this);
agent.doRestore(mBackupData, appVersionCode, mNewState, token, mBackupManagerBinder);
} catch (Exception e) {
Slog.e(TAG, "Unable to call app for restore: " + packageName, e);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE, packageName, e.toString());
agentErrorCleanup(); // clears any pending timeout messages as well
// After a restore failure we go back to running the queue. If there
// are no more packages to be restored that will be handled by the
// next step.
executeNextState(RestoreState.RUNNING_QUEUE);
}
}
void agentErrorCleanup() {
// If the agent fails restore, it might have put the app's data
// into an incoherent state. For consistency we wipe its data
// again in this case before continuing with normal teardown
clearApplicationDataSynchronous(mCurrentPackage.packageName);
agentCleanup();
}
void agentCleanup() {
mBackupDataName.delete();
try { if (mBackupData != null) mBackupData.close(); } catch (IOException e) {}
try { if (mNewState != null) mNewState.close(); } catch (IOException e) {}
mBackupData = mNewState = null;
// if everything went okay, remember the recorded state now
//
// !!! TODO: the restored data should be migrated on the server
// side into the current dataset. In that case the new state file
// we just created would reflect the data already extant in the
// backend, so there'd be nothing more to do. Until that happens,
// however, we need to make sure that we record the data to the
// current backend dataset. (Yes, this means shipping the data over
// the wire in both directions. That's bad, but consistency comes
// first, then efficiency.) Once we introduce server-side data
// migration to the newly-restored device's dataset, we will change
// the following from a discard of the newly-written state to the
// "correct" operation of renaming into the canonical state blob.
mNewStateName.delete(); // TODO: remove; see above comment
//mNewStateName.renameTo(mSavedStateName); // TODO: replace with this
// If this wasn't the PM pseudopackage, tear down the agent side
if (mCurrentPackage.applicationInfo != null) {
// unbind and tidy up even on timeout or failure
try {
mActivityManager.unbindBackupAgent(mCurrentPackage.applicationInfo);
// The agent was probably running with a stub Application object,
// which isn't a valid run mode for the main app logic. Shut
// down the app so that next time it's launched, it gets the
// usual full initialization. Note that this is only done for
// full-system restores: when a single app has requested a restore,
// it is explicitly not killed following that operation.
if (mTargetPackage == null && (mCurrentPackage.applicationInfo.flags
& ApplicationInfo.FLAG_KILL_AFTER_RESTORE) != 0) {
if (DEBUG) Slog.d(TAG, "Restore complete, killing host process of "
+ mCurrentPackage.applicationInfo.processName);
mActivityManager.killApplicationProcess(
mCurrentPackage.applicationInfo.processName,
mCurrentPackage.applicationInfo.uid);
}
} catch (RemoteException e) {
// can't happen; we run in the same process as the activity manager
}
}
// The caller is responsible for reestablishing the state machine; our
// responsibility here is to clear the decks for whatever comes next.
mBackupHandler.removeMessages(MSG_TIMEOUT, this);
synchronized (mCurrentOpLock) {
mCurrentOperations.clear();
}
}
// A call to agent.doRestore() has been positively acknowledged as complete
@Override
public void operationComplete() {
int size = (int) mBackupDataName.length();
EventLog.writeEvent(EventLogTags.RESTORE_PACKAGE, mCurrentPackage.packageName, size);
// Just go back to running the restore queue
agentCleanup();
executeNextState(RestoreState.RUNNING_QUEUE);
}
// A call to agent.doRestore() has timed out
@Override
public void handleTimeout() {
Slog.e(TAG, "Timeout restoring application " + mCurrentPackage.packageName);
EventLog.writeEvent(EventLogTags.RESTORE_AGENT_FAILURE,
mCurrentPackage.packageName, "restore timeout");
// Handle like an agent that threw on invocation: wipe it and go on to the next
agentErrorCleanup();
executeNextState(RestoreState.RUNNING_QUEUE);
}
void executeNextState(RestoreState nextState) {
if (MORE_DEBUG) Slog.i(TAG, " => executing next step on "
+ this + " nextState=" + nextState);
mCurrentState = nextState;
Message msg = mBackupHandler.obtainMessage(MSG_BACKUP_RESTORE_STEP, this);
mBackupHandler.sendMessage(msg);
}
}
class PerformClearTask implements Runnable {
IBackupTransport mTransport;
PackageInfo mPackage;
PerformClearTask(IBackupTransport transport, PackageInfo packageInfo) {
mTransport = transport;
mPackage = packageInfo;
}
public void run() {
try {
// Clear the on-device backup state to ensure a full backup next time
File stateDir = new File(mBaseStateDir, mTransport.transportDirName());
File stateFile = new File(stateDir, mPackage.packageName);
stateFile.delete();
// Tell the transport to remove all the persistent storage for the app
// TODO - need to handle failures
mTransport.clearBackupData(mPackage);
} catch (RemoteException e) {
// can't happen; the transport is local
} catch (Exception e) {
Slog.e(TAG, "Transport threw attempting to clear data for " + mPackage);
} finally {
try {
// TODO - need to handle failures
mTransport.finishBackup();
} catch (RemoteException e) {
// can't happen; the transport is local
}
// Last but not least, release the cpu
mWakelock.release();
}
}
}
class PerformInitializeTask implements Runnable {
HashSet<String> mQueue;
PerformInitializeTask(HashSet<String> transportNames) {
mQueue = transportNames;
}
public void run() {
try {
for (String transportName : mQueue) {
IBackupTransport transport = getTransport(transportName);
if (transport == null) {
Slog.e(TAG, "Requested init for " + transportName + " but not found");
continue;
}
Slog.i(TAG, "Initializing (wiping) backup transport storage: " + transportName);
EventLog.writeEvent(EventLogTags.BACKUP_START, transport.transportDirName());
long startRealtime = SystemClock.elapsedRealtime();
int status = transport.initializeDevice();
if (status == BackupConstants.TRANSPORT_OK) {
status = transport.finishBackup();
}
// Okay, the wipe really happened. Clean up our local bookkeeping.
if (status == BackupConstants.TRANSPORT_OK) {
Slog.i(TAG, "Device init successful");
int millis = (int) (SystemClock.elapsedRealtime() - startRealtime);
EventLog.writeEvent(EventLogTags.BACKUP_INITIALIZE);
resetBackupState(new File(mBaseStateDir, transport.transportDirName()));
EventLog.writeEvent(EventLogTags.BACKUP_SUCCESS, 0, millis);
synchronized (mQueueLock) {
recordInitPendingLocked(false, transportName);
}
} else {
// If this didn't work, requeue this one and try again
// after a suitable interval
Slog.e(TAG, "Transport error in initializeDevice()");
EventLog.writeEvent(EventLogTags.BACKUP_TRANSPORT_FAILURE, "(initialize)");
synchronized (mQueueLock) {
recordInitPendingLocked(true, transportName);
}
// do this via another alarm to make sure of the wakelock states
long delay = transport.requestBackupTime();
if (DEBUG) Slog.w(TAG, "init failed on "
+ transportName + " resched in " + delay);
mAlarmManager.set(AlarmManager.RTC_WAKEUP,
System.currentTimeMillis() + delay, mRunInitIntent);
}
}
} catch (RemoteException e) {
// can't happen; the transports are local
} catch (Exception e) {
Slog.e(TAG, "Unexpected error performing init", e);
} finally {
// Done; release the wakelock
mWakelock.release();
}
}
}
private void dataChangedImpl(String packageName) {
HashSet<String> targets = dataChangedTargets(packageName);
dataChangedImpl(packageName, targets);
}
private void dataChangedImpl(String packageName, HashSet<String> targets) {
// Record that we need a backup pass for the caller. Since multiple callers
// may share a uid, we need to note all candidates within that uid and schedule
// a backup pass for each of them.
EventLog.writeEvent(EventLogTags.BACKUP_DATA_CHANGED, packageName);
if (targets == null) {
Slog.w(TAG, "dataChanged but no participant pkg='" + packageName + "'"
+ " uid=" + Binder.getCallingUid());
return;
}
synchronized (mQueueLock) {
// Note that this client has made data changes that need to be backed up
if (targets.contains(packageName)) {
// Add the caller to the set of pending backups. If there is
// one already there, then overwrite it, but no harm done.
BackupRequest req = new BackupRequest(packageName);
if (mPendingBackups.put(packageName, req) == null) {
if (DEBUG) Slog.d(TAG, "Now staging backup of " + packageName);
// Journal this request in case of crash. The put()
// operation returned null when this package was not already
// in the set; we want to avoid touching the disk redundantly.
writeToJournalLocked(packageName);
if (MORE_DEBUG) {
int numKeys = mPendingBackups.size();
Slog.d(TAG, "Now awaiting backup for " + numKeys + " participants:");
for (BackupRequest b : mPendingBackups.values()) {
Slog.d(TAG, " + " + b);
}
}
}
}
}
}
// Note: packageName is currently unused, but may be in the future
private HashSet<String> dataChangedTargets(String packageName) {
// If the caller does not hold the BACKUP permission, it can only request a
// backup of its own data.
if ((mContext.checkPermission(android.Manifest.permission.BACKUP, Binder.getCallingPid(),
Binder.getCallingUid())) == PackageManager.PERMISSION_DENIED) {
synchronized (mBackupParticipants) {
return mBackupParticipants.get(Binder.getCallingUid());
}
}
// a caller with full permission can ask to back up any participating app
// !!! TODO: allow backup of ANY app?
HashSet<String> targets = new HashSet<String>();
synchronized (mBackupParticipants) {
int N = mBackupParticipants.size();
for (int i = 0; i < N; i++) {
HashSet<String> s = mBackupParticipants.valueAt(i);
if (s != null) {
targets.addAll(s);
}
}
}
return targets;
}
private void writeToJournalLocked(String str) {
RandomAccessFile out = null;
try {
if (mJournal == null) mJournal = File.createTempFile("journal", null, mJournalDir);
out = new RandomAccessFile(mJournal, "rws");
out.seek(out.length());
out.writeUTF(str);
} catch (IOException e) {
Slog.e(TAG, "Can't write " + str + " to backup journal", e);
mJournal = null;
} finally {
try { if (out != null) out.close(); } catch (IOException e) {}
}
}
// ----- IBackupManager binder interface -----
public void dataChanged(final String packageName) {
final int callingUserHandle = UserHandle.getCallingUserId();
if (callingUserHandle != UserHandle.USER_OWNER) {
// App is running under a non-owner user profile. For now, we do not back
// up data from secondary user profiles.
// TODO: backups for all user profiles.
if (MORE_DEBUG) {
Slog.v(TAG, "dataChanged(" + packageName + ") ignored because it's user "
+ callingUserHandle);
}
return;
}
final HashSet<String> targets = dataChangedTargets(packageName);
if (targets == null) {
Slog.w(TAG, "dataChanged but no participant pkg='" + packageName + "'"
+ " uid=" + Binder.getCallingUid());
return;
}
mBackupHandler.post(new Runnable() {
public void run() {
dataChangedImpl(packageName, targets);
}
});
}
// Clear the given package's backup data from the current transport
public void clearBackupData(String transportName, String packageName) {
if (DEBUG) Slog.v(TAG, "clearBackupData() of " + packageName + " on " + transportName);
PackageInfo info;
try {
info = mPackageManager.getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
} catch (NameNotFoundException e) {
Slog.d(TAG, "No such package '" + packageName + "' - not clearing backup data");
return;
}
// If the caller does not hold the BACKUP permission, it can only request a
// wipe of its own backed-up data.
HashSet<String> apps;
if ((mContext.checkPermission(android.Manifest.permission.BACKUP, Binder.getCallingPid(),
Binder.getCallingUid())) == PackageManager.PERMISSION_DENIED) {
apps = mBackupParticipants.get(Binder.getCallingUid());
} else {
// a caller with full permission can ask to back up any participating app
// !!! TODO: allow data-clear of ANY app?
if (DEBUG) Slog.v(TAG, "Privileged caller, allowing clear of other apps");
apps = new HashSet<String>();
int N = mBackupParticipants.size();
for (int i = 0; i < N; i++) {
HashSet<String> s = mBackupParticipants.valueAt(i);
if (s != null) {
apps.addAll(s);
}
}
}
// Is the given app an available participant?
if (apps.contains(packageName)) {
// found it; fire off the clear request
if (DEBUG) Slog.v(TAG, "Found the app - running clear process");
mBackupHandler.removeMessages(MSG_RETRY_CLEAR);
synchronized (mQueueLock) {
final IBackupTransport transport = getTransport(transportName);
if (transport == null) {
// transport is currently unavailable -- make sure to retry
Message msg = mBackupHandler.obtainMessage(MSG_RETRY_CLEAR,
new ClearRetryParams(transportName, packageName));
mBackupHandler.sendMessageDelayed(msg, TRANSPORT_RETRY_INTERVAL);
return;
}
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_CLEAR,
new ClearParams(transport, info));
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
}
}
}
// Run a backup pass immediately for any applications that have declared
// that they have pending updates.
public void backupNow() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "backupNow");
if (DEBUG) Slog.v(TAG, "Scheduling immediate backup pass");
synchronized (mQueueLock) {
// Because the alarms we are using can jitter, and we want an *immediate*
// backup pass to happen, we restart the timer beginning with "next time,"
// then manually fire the backup trigger intent ourselves.
startBackupAlarmsLocked(BACKUP_INTERVAL);
try {
mRunBackupIntent.send();
} catch (PendingIntent.CanceledException e) {
// should never happen
Slog.e(TAG, "run-backup intent cancelled!");
}
}
}
boolean deviceIsProvisioned() {
final ContentResolver resolver = mContext.getContentResolver();
return (Settings.Global.getInt(resolver, Settings.Global.DEVICE_PROVISIONED, 0) != 0);
}
// Run a *full* backup pass for the given package, writing the resulting data stream
// to the supplied file descriptor. This method is synchronous and does not return
// to the caller until the backup has been completed.
public void fullBackup(ParcelFileDescriptor fd, boolean includeApks,
boolean includeObbs, boolean includeShared,
boolean doAllApps, boolean includeSystem, String[] pkgList) {
mContext.enforceCallingPermission(android.Manifest.permission.BACKUP, "fullBackup");
final int callingUserHandle = UserHandle.getCallingUserId();
if (callingUserHandle != UserHandle.USER_OWNER) {
throw new IllegalStateException("Backup supported only for the device owner");
}
// Validate
if (!doAllApps) {
if (!includeShared) {
// If we're backing up shared data (sdcard or equivalent), then we can run
// without any supplied app names. Otherwise, we'd be doing no work, so
// report the error.
if (pkgList == null || pkgList.length == 0) {
throw new IllegalArgumentException(
"Backup requested but neither shared nor any apps named");
}
}
}
long oldId = Binder.clearCallingIdentity();
try {
// Doesn't make sense to do a full backup prior to setup
if (!deviceIsProvisioned()) {
Slog.i(TAG, "Full backup not supported before setup");
return;
}
if (DEBUG) Slog.v(TAG, "Requesting full backup: apks=" + includeApks
+ " obb=" + includeObbs + " shared=" + includeShared + " all=" + doAllApps
+ " pkgs=" + pkgList);
Slog.i(TAG, "Beginning full backup...");
FullBackupParams params = new FullBackupParams(fd, includeApks, includeObbs,
includeShared, doAllApps, includeSystem, pkgList);
final int token = generateToken();
synchronized (mFullConfirmations) {
mFullConfirmations.put(token, params);
}
// start up the confirmation UI
if (DEBUG) Slog.d(TAG, "Starting backup confirmation UI, token=" + token);
if (!startConfirmationUi(token, FullBackup.FULL_BACKUP_INTENT_ACTION)) {
Slog.e(TAG, "Unable to launch full backup confirmation");
mFullConfirmations.delete(token);
return;
}
// make sure the screen is lit for the user interaction
mPowerManager.userActivity(SystemClock.uptimeMillis(), false);
// start the confirmation countdown
startConfirmationTimeout(token, params);
// wait for the backup to be performed
if (DEBUG) Slog.d(TAG, "Waiting for full backup completion...");
waitForCompletion(params);
} finally {
try {
fd.close();
} catch (IOException e) {
// just eat it
}
Binder.restoreCallingIdentity(oldId);
Slog.d(TAG, "Full backup processing complete.");
}
}
public void fullRestore(ParcelFileDescriptor fd) {
mContext.enforceCallingPermission(android.Manifest.permission.BACKUP, "fullRestore");
final int callingUserHandle = UserHandle.getCallingUserId();
if (callingUserHandle != UserHandle.USER_OWNER) {
throw new IllegalStateException("Restore supported only for the device owner");
}
long oldId = Binder.clearCallingIdentity();
try {
// Check whether the device has been provisioned -- we don't handle
// full restores prior to completing the setup process.
if (!deviceIsProvisioned()) {
Slog.i(TAG, "Full restore not permitted before setup");
return;
}
Slog.i(TAG, "Beginning full restore...");
FullRestoreParams params = new FullRestoreParams(fd);
final int token = generateToken();
synchronized (mFullConfirmations) {
mFullConfirmations.put(token, params);
}
// start up the confirmation UI
if (DEBUG) Slog.d(TAG, "Starting restore confirmation UI, token=" + token);
if (!startConfirmationUi(token, FullBackup.FULL_RESTORE_INTENT_ACTION)) {
Slog.e(TAG, "Unable to launch full restore confirmation");
mFullConfirmations.delete(token);
return;
}
// make sure the screen is lit for the user interaction
mPowerManager.userActivity(SystemClock.uptimeMillis(), false);
// start the confirmation countdown
startConfirmationTimeout(token, params);
// wait for the restore to be performed
if (DEBUG) Slog.d(TAG, "Waiting for full restore completion...");
waitForCompletion(params);
} finally {
try {
fd.close();
} catch (IOException e) {
Slog.w(TAG, "Error trying to close fd after full restore: " + e);
}
Binder.restoreCallingIdentity(oldId);
Slog.i(TAG, "Full restore processing complete.");
}
}
boolean startConfirmationUi(int token, String action) {
try {
Intent confIntent = new Intent(action);
confIntent.setClassName("com.android.backupconfirm",
"com.android.backupconfirm.BackupRestoreConfirmation");
confIntent.putExtra(FullBackup.CONF_TOKEN_INTENT_EXTRA, token);
confIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(confIntent);
} catch (ActivityNotFoundException e) {
return false;
}
return true;
}
void startConfirmationTimeout(int token, FullParams params) {
if (MORE_DEBUG) Slog.d(TAG, "Posting conf timeout msg after "
+ TIMEOUT_FULL_CONFIRMATION + " millis");
Message msg = mBackupHandler.obtainMessage(MSG_FULL_CONFIRMATION_TIMEOUT,
token, 0, params);
mBackupHandler.sendMessageDelayed(msg, TIMEOUT_FULL_CONFIRMATION);
}
void waitForCompletion(FullParams params) {
synchronized (params.latch) {
while (params.latch.get() == false) {
try {
params.latch.wait();
} catch (InterruptedException e) { /* never interrupted */ }
}
}
}
void signalFullBackupRestoreCompletion(FullParams params) {
synchronized (params.latch) {
params.latch.set(true);
params.latch.notifyAll();
}
}
// Confirm that the previously-requested full backup/restore operation can proceed. This
// is used to require a user-facing disclosure about the operation.
@Override
public void acknowledgeFullBackupOrRestore(int token, boolean allow,
String curPassword, String encPpassword, IFullBackupRestoreObserver observer) {
if (DEBUG) Slog.d(TAG, "acknowledgeFullBackupOrRestore : token=" + token
+ " allow=" + allow);
// TODO: possibly require not just this signature-only permission, but even
// require that the specific designated confirmation-UI app uid is the caller?
mContext.enforceCallingPermission(android.Manifest.permission.BACKUP, "acknowledgeFullBackupOrRestore");
long oldId = Binder.clearCallingIdentity();
try {
FullParams params;
synchronized (mFullConfirmations) {
params = mFullConfirmations.get(token);
if (params != null) {
mBackupHandler.removeMessages(MSG_FULL_CONFIRMATION_TIMEOUT, params);
mFullConfirmations.delete(token);
if (allow) {
final int verb = params instanceof FullBackupParams
? MSG_RUN_FULL_BACKUP
: MSG_RUN_FULL_RESTORE;
params.observer = observer;
params.curPassword = curPassword;
boolean isEncrypted;
try {
isEncrypted = (mMountService.getEncryptionState() != MountService.ENCRYPTION_STATE_NONE);
if (isEncrypted) Slog.w(TAG, "Device is encrypted; forcing enc password");
} catch (RemoteException e) {
// couldn't contact the mount service; fail "safe" and assume encryption
Slog.e(TAG, "Unable to contact mount service!");
isEncrypted = true;
}
params.encryptPassword = (isEncrypted) ? curPassword : encPpassword;
if (DEBUG) Slog.d(TAG, "Sending conf message with verb " + verb);
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(verb, params);
mBackupHandler.sendMessage(msg);
} else {
Slog.w(TAG, "User rejected full backup/restore operation");
// indicate completion without having actually transferred any data
signalFullBackupRestoreCompletion(params);
}
} else {
Slog.w(TAG, "Attempted to ack full backup/restore with invalid token");
}
}
} finally {
Binder.restoreCallingIdentity(oldId);
}
}
// Enable/disable the backup service
@Override
public void setBackupEnabled(boolean enable) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupEnabled");
Slog.i(TAG, "Backup enabled => " + enable);
long oldId = Binder.clearCallingIdentity();
try {
boolean wasEnabled = mEnabled;
synchronized (this) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.BACKUP_ENABLED, enable ? 1 : 0);
mEnabled = enable;
}
synchronized (mQueueLock) {
if (enable && !wasEnabled && mProvisioned) {
// if we've just been enabled, start scheduling backup passes
startBackupAlarmsLocked(BACKUP_INTERVAL);
} else if (!enable) {
// No longer enabled, so stop running backups
if (DEBUG) Slog.i(TAG, "Opting out of backup");
mAlarmManager.cancel(mRunBackupIntent);
// This also constitutes an opt-out, so we wipe any data for
// this device from the backend. We start that process with
// an alarm in order to guarantee wakelock states.
if (wasEnabled && mProvisioned) {
// NOTE: we currently flush every registered transport, not just
// the currently-active one.
HashSet<String> allTransports;
synchronized (mTransports) {
allTransports = new HashSet<String>(mTransports.keySet());
}
// build the set of transports for which we are posting an init
for (String transport : allTransports) {
recordInitPendingLocked(true, transport);
}
mAlarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
mRunInitIntent);
}
}
}
} finally {
Binder.restoreCallingIdentity(oldId);
}
}
// Enable/disable automatic restore of app data at install time
public void setAutoRestore(boolean doAutoRestore) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setAutoRestore");
Slog.i(TAG, "Auto restore => " + doAutoRestore);
synchronized (this) {
Settings.Secure.putInt(mContext.getContentResolver(),
Settings.Secure.BACKUP_AUTO_RESTORE, doAutoRestore ? 1 : 0);
mAutoRestore = doAutoRestore;
}
}
// Mark the backup service as having been provisioned
public void setBackupProvisioned(boolean available) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"setBackupProvisioned");
/*
* This is now a no-op; provisioning is simply the device's own setup state.
*/
}
private void startBackupAlarmsLocked(long delayBeforeFirstBackup) {
// We used to use setInexactRepeating(), but that may be linked to
// backups running at :00 more often than not, creating load spikes.
// Schedule at an exact time for now, and also add a bit of "fuzz".
Random random = new Random();
long when = System.currentTimeMillis() + delayBeforeFirstBackup +
random.nextInt(FUZZ_MILLIS);
mAlarmManager.setRepeating(AlarmManager.RTC_WAKEUP, when,
BACKUP_INTERVAL + random.nextInt(FUZZ_MILLIS), mRunBackupIntent);
mNextBackupPass = when;
}
// Report whether the backup mechanism is currently enabled
public boolean isBackupEnabled() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "isBackupEnabled");
return mEnabled; // no need to synchronize just to read it
}
// Report the name of the currently active transport
public String getCurrentTransport() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getCurrentTransport");
if (MORE_DEBUG) Slog.v(TAG, "... getCurrentTransport() returning " + mCurrentTransport);
return mCurrentTransport;
}
// Report all known, available backup transports
public String[] listAllTransports() {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "listAllTransports");
String[] list = null;
ArrayList<String> known = new ArrayList<String>();
for (Map.Entry<String, IBackupTransport> entry : mTransports.entrySet()) {
if (entry.getValue() != null) {
known.add(entry.getKey());
}
}
if (known.size() > 0) {
list = new String[known.size()];
known.toArray(list);
}
return list;
}
// Select which transport to use for the next backup operation. If the given
// name is not one of the available transports, no action is taken and the method
// returns null.
public String selectBackupTransport(String transport) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP, "selectBackupTransport");
synchronized (mTransports) {
String prevTransport = null;
if (mTransports.get(transport) != null) {
prevTransport = mCurrentTransport;
mCurrentTransport = transport;
Settings.Secure.putString(mContext.getContentResolver(),
Settings.Secure.BACKUP_TRANSPORT, transport);
Slog.v(TAG, "selectBackupTransport() set " + mCurrentTransport
+ " returning " + prevTransport);
} else {
Slog.w(TAG, "Attempt to select unavailable transport " + transport);
}
return prevTransport;
}
}
// Supply the configuration Intent for the given transport. If the name is not one
// of the available transports, or if the transport does not supply any configuration
// UI, the method returns null.
public Intent getConfigurationIntent(String transportName) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getConfigurationIntent");
synchronized (mTransports) {
final IBackupTransport transport = mTransports.get(transportName);
if (transport != null) {
try {
final Intent intent = transport.configurationIntent();
if (MORE_DEBUG) Slog.d(TAG, "getConfigurationIntent() returning config intent "
+ intent);
return intent;
} catch (RemoteException e) {
/* fall through to return null */
}
}
}
return null;
}
// Supply the configuration summary string for the given transport. If the name is
// not one of the available transports, or if the transport does not supply any
// summary / destination string, the method can return null.
//
// This string is used VERBATIM as the summary text of the relevant Settings item!
public String getDestinationString(String transportName) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getDestinationString");
synchronized (mTransports) {
final IBackupTransport transport = mTransports.get(transportName);
if (transport != null) {
try {
final String text = transport.currentDestinationString();
if (MORE_DEBUG) Slog.d(TAG, "getDestinationString() returning " + text);
return text;
} catch (RemoteException e) {
/* fall through to return null */
}
}
}
return null;
}
// Callback: a requested backup agent has been instantiated. This should only
// be called from the Activity Manager.
public void agentConnected(String packageName, IBinder agentBinder) {
synchronized(mAgentConnectLock) {
if (Binder.getCallingUid() == Process.SYSTEM_UID) {
Slog.d(TAG, "agentConnected pkg=" + packageName + " agent=" + agentBinder);
IBackupAgent agent = IBackupAgent.Stub.asInterface(agentBinder);
mConnectedAgent = agent;
mConnecting = false;
} else {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " claiming agent connected");
}
mAgentConnectLock.notifyAll();
}
}
// Callback: a backup agent has failed to come up, or has unexpectedly quit.
// If the agent failed to come up in the first place, the agentBinder argument
// will be null. This should only be called from the Activity Manager.
public void agentDisconnected(String packageName) {
// TODO: handle backup being interrupted
synchronized(mAgentConnectLock) {
if (Binder.getCallingUid() == Process.SYSTEM_UID) {
mConnectedAgent = null;
mConnecting = false;
} else {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " claiming agent disconnected");
}
mAgentConnectLock.notifyAll();
}
}
// An application being installed will need a restore pass, then the Package Manager
// will need to be told when the restore is finished.
public void restoreAtInstall(String packageName, int token) {
if (Binder.getCallingUid() != Process.SYSTEM_UID) {
Slog.w(TAG, "Non-system process uid=" + Binder.getCallingUid()
+ " attemping install-time restore");
return;
}
boolean skip = false;
long restoreSet = getAvailableRestoreToken(packageName);
if (DEBUG) Slog.v(TAG, "restoreAtInstall pkg=" + packageName
+ " token=" + Integer.toHexString(token)
+ " restoreSet=" + Long.toHexString(restoreSet));
if (restoreSet == 0) {
if (MORE_DEBUG) Slog.i(TAG, "No restore set");
skip = true;
}
// Do we have a transport to fetch data for us?
IBackupTransport transport = getTransport(mCurrentTransport);
if (transport == null) {
if (DEBUG) Slog.w(TAG, "No transport");
skip = true;
}
if (!skip && mAutoRestore && mProvisioned) {
try {
// okay, we're going to attempt a restore of this package from this restore set.
// The eventual message back into the Package Manager to run the post-install
// steps for 'token' will be issued from the restore handling code.
// This can throw and so *must* happen before the wakelock is acquired
String dirName = transport.transportDirName();
// We can use a synthetic PackageInfo here because:
// 1. We know it's valid, since the Package Manager supplied the name
// 2. Only the packageName field will be used by the restore code
PackageInfo pkg = new PackageInfo();
pkg.packageName = packageName;
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(transport, dirName, null,
restoreSet, pkg, token, true);
mBackupHandler.sendMessage(msg);
} catch (RemoteException e) {
// Binding to the transport broke; back off and proceed with the installation.
Slog.e(TAG, "Unable to contact transport");
skip = true;
}
}
if (skip) {
// Auto-restore disabled or no way to attempt a restore; just tell the Package
// Manager to proceed with the post-install handling for this package.
if (DEBUG) Slog.v(TAG, "Skipping");
try {
mPackageManagerBinder.finishPackageInstall(token);
} catch (RemoteException e) { /* can't happen */ }
}
}
// Hand off a restore session
public IRestoreSession beginRestoreSession(String packageName, String transport) {
if (DEBUG) Slog.v(TAG, "beginRestoreSession: pkg=" + packageName
+ " transport=" + transport);
boolean needPermission = true;
if (transport == null) {
transport = mCurrentTransport;
if (packageName != null) {
PackageInfo app = null;
try {
app = mPackageManager.getPackageInfo(packageName, 0);
} catch (NameNotFoundException nnf) {
Slog.w(TAG, "Asked to restore nonexistent pkg " + packageName);
throw new IllegalArgumentException("Package " + packageName + " not found");
}
if (app.applicationInfo.uid == Binder.getCallingUid()) {
// So: using the current active transport, and the caller has asked
// that its own package will be restored. In this narrow use case
// we do not require the caller to hold the permission.
needPermission = false;
}
}
}
if (needPermission) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"beginRestoreSession");
} else {
if (DEBUG) Slog.d(TAG, "restoring self on current transport; no permission needed");
}
synchronized(this) {
if (mActiveRestoreSession != null) {
Slog.d(TAG, "Restore session requested but one already active");
return null;
}
mActiveRestoreSession = new ActiveRestoreSession(packageName, transport);
mBackupHandler.sendEmptyMessageDelayed(MSG_RESTORE_TIMEOUT, TIMEOUT_RESTORE_INTERVAL);
}
return mActiveRestoreSession;
}
void clearRestoreSession(ActiveRestoreSession currentSession) {
synchronized(this) {
if (currentSession != mActiveRestoreSession) {
Slog.e(TAG, "ending non-current restore session");
} else {
if (DEBUG) Slog.v(TAG, "Clearing restore session and halting timeout");
mActiveRestoreSession = null;
mBackupHandler.removeMessages(MSG_RESTORE_TIMEOUT);
}
}
}
// Note that a currently-active backup agent has notified us that it has
// completed the given outstanding asynchronous backup/restore operation.
@Override
public void opComplete(int token) {
if (MORE_DEBUG) Slog.v(TAG, "opComplete: " + Integer.toHexString(token));
Operation op = null;
synchronized (mCurrentOpLock) {
op = mCurrentOperations.get(token);
if (op != null) {
op.state = OP_ACKNOWLEDGED;
}
mCurrentOpLock.notifyAll();
}
// The completion callback, if any, is invoked on the handler
if (op != null && op.callback != null) {
Message msg = mBackupHandler.obtainMessage(MSG_OP_COMPLETE, op.callback);
mBackupHandler.sendMessage(msg);
}
}
// ----- Restore session -----
class ActiveRestoreSession extends IRestoreSession.Stub {
private static final String TAG = "RestoreSession";
private String mPackageName;
private IBackupTransport mRestoreTransport = null;
RestoreSet[] mRestoreSets = null;
boolean mEnded = false;
ActiveRestoreSession(String packageName, String transport) {
mPackageName = packageName;
mRestoreTransport = getTransport(transport);
}
// --- Binder interface ---
public synchronized int getAvailableRestoreSets(IRestoreObserver observer) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"getAvailableRestoreSets");
if (observer == null) {
throw new IllegalArgumentException("Observer must not be null");
}
if (mEnded) {
throw new IllegalStateException("Restore session already ended");
}
long oldId = Binder.clearCallingIdentity();
try {
if (mRestoreTransport == null) {
Slog.w(TAG, "Null transport getting restore sets");
return -1;
}
// spin off the transport request to our service thread
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_GET_RESTORE_SETS,
new RestoreGetSetsParams(mRestoreTransport, this, observer));
mBackupHandler.sendMessage(msg);
return 0;
} catch (Exception e) {
Slog.e(TAG, "Error in getAvailableRestoreSets", e);
return -1;
} finally {
Binder.restoreCallingIdentity(oldId);
}
}
public synchronized int restoreAll(long token, IRestoreObserver observer) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"performRestore");
if (DEBUG) Slog.d(TAG, "restoreAll token=" + Long.toHexString(token)
+ " observer=" + observer);
if (mEnded) {
throw new IllegalStateException("Restore session already ended");
}
if (mRestoreTransport == null || mRestoreSets == null) {
Slog.e(TAG, "Ignoring restoreAll() with no restore set");
return -1;
}
if (mPackageName != null) {
Slog.e(TAG, "Ignoring restoreAll() on single-package session");
return -1;
}
String dirName;
try {
dirName = mRestoreTransport.transportDirName();
} catch (RemoteException e) {
// Transport went AWOL; fail.
Slog.e(TAG, "Unable to contact transport for restore");
return -1;
}
synchronized (mQueueLock) {
for (int i = 0; i < mRestoreSets.length; i++) {
if (token == mRestoreSets[i].token) {
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(mRestoreTransport, dirName,
observer, token, true);
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
return 0;
}
}
}
Slog.w(TAG, "Restore token " + Long.toHexString(token) + " not found");
return -1;
}
public synchronized int restoreSome(long token, IRestoreObserver observer,
String[] packages) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.BACKUP,
"performRestore");
if (DEBUG) {
StringBuilder b = new StringBuilder(128);
b.append("restoreSome token=");
b.append(Long.toHexString(token));
b.append(" observer=");
b.append(observer.toString());
b.append(" packages=");
if (packages == null) {
b.append("null");
} else {
b.append('{');
boolean first = true;
for (String s : packages) {
if (!first) {
b.append(", ");
} else first = false;
b.append(s);
}
b.append('}');
}
Slog.d(TAG, b.toString());
}
if (mEnded) {
throw new IllegalStateException("Restore session already ended");
}
if (mRestoreTransport == null || mRestoreSets == null) {
Slog.e(TAG, "Ignoring restoreAll() with no restore set");
return -1;
}
if (mPackageName != null) {
Slog.e(TAG, "Ignoring restoreAll() on single-package session");
return -1;
}
String dirName;
try {
dirName = mRestoreTransport.transportDirName();
} catch (RemoteException e) {
// Transport went AWOL; fail.
Slog.e(TAG, "Unable to contact transport for restore");
return -1;
}
synchronized (mQueueLock) {
for (int i = 0; i < mRestoreSets.length; i++) {
if (token == mRestoreSets[i].token) {
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(mRestoreTransport, dirName, observer, token,
packages, true);
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
return 0;
}
}
}
Slog.w(TAG, "Restore token " + Long.toHexString(token) + " not found");
return -1;
}
public synchronized int restorePackage(String packageName, IRestoreObserver observer) {
if (DEBUG) Slog.v(TAG, "restorePackage pkg=" + packageName + " obs=" + observer);
if (mEnded) {
throw new IllegalStateException("Restore session already ended");
}
if (mPackageName != null) {
if (! mPackageName.equals(packageName)) {
Slog.e(TAG, "Ignoring attempt to restore pkg=" + packageName
+ " on session for package " + mPackageName);
return -1;
}
}
PackageInfo app = null;
try {
app = mPackageManager.getPackageInfo(packageName, 0);
} catch (NameNotFoundException nnf) {
Slog.w(TAG, "Asked to restore nonexistent pkg " + packageName);
return -1;
}
// If the caller is not privileged and is not coming from the target
// app's uid, throw a permission exception back to the caller.
int perm = mContext.checkPermission(android.Manifest.permission.BACKUP,
Binder.getCallingPid(), Binder.getCallingUid());
if ((perm == PackageManager.PERMISSION_DENIED) &&
(app.applicationInfo.uid != Binder.getCallingUid())) {
Slog.w(TAG, "restorePackage: bad packageName=" + packageName
+ " or calling uid=" + Binder.getCallingUid());
throw new SecurityException("No permission to restore other packages");
}
// If the package has no backup agent, we obviously cannot proceed
if (app.applicationInfo.backupAgentName == null) {
Slog.w(TAG, "Asked to restore package " + packageName + " with no agent");
return -1;
}
// So far so good; we're allowed to try to restore this package. Now
// check whether there is data for it in the current dataset, falling back
// to the ancestral dataset if not.
long token = getAvailableRestoreToken(packageName);
// If we didn't come up with a place to look -- no ancestral dataset and
// the app has never been backed up from this device -- there's nothing
// to do but return failure.
if (token == 0) {
if (DEBUG) Slog.w(TAG, "No data available for this package; not restoring");
return -1;
}
String dirName;
try {
dirName = mRestoreTransport.transportDirName();
} catch (RemoteException e) {
// Transport went AWOL; fail.
Slog.e(TAG, "Unable to contact transport for restore");
return -1;
}
// Ready to go: enqueue the restore request and claim success
long oldId = Binder.clearCallingIdentity();
mWakelock.acquire();
Message msg = mBackupHandler.obtainMessage(MSG_RUN_RESTORE);
msg.obj = new RestoreParams(mRestoreTransport, dirName,
observer, token, app, 0, false);
mBackupHandler.sendMessage(msg);
Binder.restoreCallingIdentity(oldId);
return 0;
}
// Posted to the handler to tear down a restore session in a cleanly synchronized way
class EndRestoreRunnable implements Runnable {
BackupManagerService mBackupManager;
ActiveRestoreSession mSession;
EndRestoreRunnable(BackupManagerService manager, ActiveRestoreSession session) {
mBackupManager = manager;
mSession = session;
}
public void run() {
// clean up the session's bookkeeping
synchronized (mSession) {
try {
if (mSession.mRestoreTransport != null) {
mSession.mRestoreTransport.finishRestore();
}
} catch (Exception e) {
Slog.e(TAG, "Error in finishRestore", e);
} finally {
mSession.mRestoreTransport = null;
mSession.mEnded = true;
}
}
// clean up the BackupManagerService side of the bookkeeping
// and cancel any pending timeout message
mBackupManager.clearRestoreSession(mSession);
}
}
public synchronized void endRestoreSession() {
if (DEBUG) Slog.d(TAG, "endRestoreSession");
if (mEnded) {
throw new IllegalStateException("Restore session already ended");
}
mBackupHandler.post(new EndRestoreRunnable(BackupManagerService.this, this));
}
}
@Override
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);
long identityToken = Binder.clearCallingIdentity();
try {
dumpInternal(pw);
} finally {
Binder.restoreCallingIdentity(identityToken);
}
}
private void dumpInternal(PrintWriter pw) {
synchronized (mQueueLock) {
pw.println("Backup Manager is " + (mEnabled ? "enabled" : "disabled")
+ " / " + (!mProvisioned ? "not " : "") + "provisioned / "
+ (this.mPendingInits.size() == 0 ? "not " : "") + "pending init");
pw.println("Auto-restore is " + (mAutoRestore ? "enabled" : "disabled"));
if (mBackupRunning) pw.println("Backup currently running");
pw.println("Last backup pass started: " + mLastBackupPass
+ " (now = " + System.currentTimeMillis() + ')');
pw.println(" next scheduled: " + mNextBackupPass);
pw.println("Available transports:");
for (String t : listAllTransports()) {
pw.println((t.equals(mCurrentTransport) ? " * " : " ") + t);
try {
IBackupTransport transport = getTransport(t);
File dir = new File(mBaseStateDir, transport.transportDirName());
pw.println(" destination: " + transport.currentDestinationString());
pw.println(" intent: " + transport.configurationIntent());
for (File f : dir.listFiles()) {
pw.println(" " + f.getName() + " - " + f.length() + " state bytes");
}
} catch (Exception e) {
Slog.e(TAG, "Error in transport", e);
pw.println(" Error: " + e);
}
}
pw.println("Pending init: " + mPendingInits.size());
for (String s : mPendingInits) {
pw.println(" " + s);
}
if (DEBUG_BACKUP_TRACE) {
synchronized (mBackupTrace) {
if (!mBackupTrace.isEmpty()) {
pw.println("Most recent backup trace:");
for (String s : mBackupTrace) {
pw.println(" " + s);
}
}
}
}
int N = mBackupParticipants.size();
pw.println("Participants:");
for (int i=0; i<N; i++) {
int uid = mBackupParticipants.keyAt(i);
pw.print(" uid: ");
pw.println(uid);
HashSet<String> participants = mBackupParticipants.valueAt(i);
for (String app: participants) {
pw.println(" " + app);
}
}
pw.println("Ancestral packages: "
+ (mAncestralPackages == null ? "none" : mAncestralPackages.size()));
if (mAncestralPackages != null) {
for (String pkg : mAncestralPackages) {
pw.println(" " + pkg);
}
}
pw.println("Ever backed up: " + mEverStoredApps.size());
for (String pkg : mEverStoredApps) {
pw.println(" " + pkg);
}
pw.println("Pending backup: " + mPendingBackups.size());
for (BackupRequest req : mPendingBackups.values()) {
pw.println(" " + req);
}
}
}
}