| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.providers.settings; |
| |
| import android.annotation.UserIdInt; |
| import android.app.backup.BackupAgentHelper; |
| import android.app.backup.BackupDataInput; |
| import android.app.backup.BackupDataOutput; |
| import android.app.backup.FullBackupDataOutput; |
| import android.content.ContentResolver; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.net.NetworkPolicy; |
| import android.net.NetworkPolicyManager; |
| import android.net.Uri; |
| import android.net.wifi.SoftApConfiguration; |
| import android.net.wifi.WifiManager; |
| import android.os.Build; |
| import android.os.ParcelFileDescriptor; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| import android.provider.settings.backup.DeviceSpecificSettings; |
| import android.provider.settings.backup.GlobalSettings; |
| import android.provider.settings.backup.SecureSettings; |
| import android.provider.settings.backup.SystemSettings; |
| import android.provider.settings.validators.GlobalSettingsValidators; |
| import android.provider.settings.validators.SecureSettingsValidators; |
| import android.provider.settings.validators.SystemSettingsValidators; |
| import android.provider.settings.validators.Validator; |
| import android.util.ArrayMap; |
| import android.util.ArraySet; |
| import android.util.BackupUtils; |
| import android.util.FeatureFlagUtils; |
| import android.util.Log; |
| import android.util.Slog; |
| import android.view.Display; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.ArrayUtils; |
| import com.android.internal.widget.LockPatternUtils; |
| import com.android.settingslib.display.DisplayDensityConfiguration; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.EOFException; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.time.DateTimeException; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.zip.CRC32; |
| |
| /** |
| * Performs backup and restore of the System and Secure settings. |
| * List of settings that are backed up are stored in the Settings.java file |
| */ |
| public class SettingsBackupAgent extends BackupAgentHelper { |
| private static final boolean DEBUG = false; |
| private static final boolean DEBUG_BACKUP = DEBUG || false; |
| |
| private static final byte[] NULL_VALUE = new byte[0]; |
| private static final int NULL_SIZE = -1; |
| |
| private static final String KEY_SYSTEM = "system"; |
| private static final String KEY_SECURE = "secure"; |
| private static final String KEY_GLOBAL = "global"; |
| private static final String KEY_LOCALE = "locale"; |
| private static final String KEY_LOCK_SETTINGS = "lock_settings"; |
| private static final String KEY_SOFTAP_CONFIG = "softap_config"; |
| private static final String KEY_NETWORK_POLICIES = "network_policies"; |
| private static final String KEY_WIFI_NEW_CONFIG = "wifi_new_config"; |
| private static final String KEY_DEVICE_SPECIFIC_CONFIG = "device_specific_config"; |
| |
| // Versioning of the state file. Increment this version |
| // number any time the set of state items is altered. |
| private static final int STATE_VERSION = 8; |
| |
| // Versioning of the Network Policies backup payload. |
| private static final int NETWORK_POLICIES_BACKUP_VERSION = 1; |
| |
| |
| // Slots in the checksum array. Never insert new items in the middle |
| // of this array; new slots must be appended. |
| private static final int STATE_SYSTEM = 0; |
| private static final int STATE_SECURE = 1; |
| private static final int STATE_LOCALE = 2; |
| private static final int STATE_WIFI_SUPPLICANT = 3; |
| private static final int STATE_WIFI_CONFIG = 4; |
| private static final int STATE_GLOBAL = 5; |
| private static final int STATE_LOCK_SETTINGS = 6; |
| private static final int STATE_SOFTAP_CONFIG = 7; |
| private static final int STATE_NETWORK_POLICIES = 8; |
| private static final int STATE_WIFI_NEW_CONFIG = 9; |
| private static final int STATE_DEVICE_CONFIG = 10; |
| |
| private static final int STATE_SIZE = 11; // The current number of state items |
| |
| // Number of entries in the checksum array at various version numbers |
| private static final int STATE_SIZES[] = { |
| 0, |
| 4, // version 1 |
| 5, // version 2 added STATE_WIFI_CONFIG |
| 6, // version 3 added STATE_GLOBAL |
| 7, // version 4 added STATE_LOCK_SETTINGS |
| 8, // version 5 added STATE_SOFTAP_CONFIG |
| 9, // version 6 added STATE_NETWORK_POLICIES |
| 10, // version 7 added STATE_WIFI_NEW_CONFIG |
| STATE_SIZE // version 8 added STATE_DEVICE_CONFIG |
| }; |
| |
| private static final int FULL_BACKUP_ADDED_GLOBAL = 2; // added the "global" entry |
| private static final int FULL_BACKUP_ADDED_LOCK_SETTINGS = 3; // added the "lock_settings" entry |
| private static final int FULL_BACKUP_ADDED_SOFTAP_CONF = 4; //added the "softap_config" entry |
| private static final int FULL_BACKUP_ADDED_NETWORK_POLICIES = 5; //added "network_policies" |
| private static final int FULL_BACKUP_ADDED_WIFI_NEW = 6; // added "wifi_new_config" entry |
| private static final int FULL_BACKUP_ADDED_DEVICE_SPECIFIC = 7; // added "device specific" entry |
| // Versioning of the 'full backup' format |
| // Increment this version any time a new item is added |
| private static final int FULL_BACKUP_VERSION = FULL_BACKUP_ADDED_DEVICE_SPECIFIC; |
| |
| private static final int INTEGER_BYTE_COUNT = Integer.SIZE / Byte.SIZE; |
| |
| private static final byte[] EMPTY_DATA = new byte[0]; |
| |
| private static final String TAG = "SettingsBackupAgent"; |
| |
| @VisibleForTesting |
| static final String[] PROJECTION = { |
| Settings.NameValueTable.NAME, |
| Settings.NameValueTable.VALUE |
| }; |
| |
| // Versioning of the 'device specific' section of a backup |
| // Increment this any time the format is changed or data added. |
| @VisibleForTesting |
| static final int DEVICE_SPECIFIC_VERSION = 1; |
| |
| // the key to store the WIFI data under, should be sorted as last, so restore happens last. |
| // use very late unicode character to quasi-guarantee last sort position. |
| private static final String KEY_WIFI_SUPPLICANT = "\uffedWIFI"; |
| private static final String KEY_WIFI_CONFIG = "\uffedCONFIG_WIFI"; |
| |
| // Keys within the lock settings section |
| private static final String KEY_LOCK_SETTINGS_OWNER_INFO_ENABLED = "owner_info_enabled"; |
| private static final String KEY_LOCK_SETTINGS_OWNER_INFO = "owner_info"; |
| private static final String KEY_LOCK_SETTINGS_VISIBLE_PATTERN_ENABLED = |
| "visible_pattern_enabled"; |
| private static final String KEY_LOCK_SETTINGS_POWER_BUTTON_INSTANTLY_LOCKS = |
| "power_button_instantly_locks"; |
| |
| // Name of the temporary file we use during full backup/restore. This is |
| // stored in the full-backup tarfile as well, so should not be changed. |
| private static final String STAGE_FILE = "flattened-data"; |
| |
| // List of keys that support restore to lower version of the SDK, introduced in Android P |
| private static final ArraySet<String> RESTORE_FROM_HIGHER_SDK_INT_SUPPORTED_KEYS = |
| new ArraySet<String>(Arrays.asList(new String[] { |
| KEY_NETWORK_POLICIES, |
| KEY_WIFI_NEW_CONFIG, |
| KEY_SYSTEM, |
| KEY_SECURE, |
| KEY_GLOBAL, |
| })); |
| |
| @VisibleForTesting |
| SettingsHelper mSettingsHelper; |
| |
| private WifiManager mWifiManager; |
| |
| // Version of the SDK that com.android.providers.settings package has been restored from. |
| // Populated in onRestore(). |
| private int mRestoredFromSdkInt; |
| |
| @Override |
| public void onCreate() { |
| if (DEBUG_BACKUP) Log.d(TAG, "onCreate() invoked"); |
| |
| mSettingsHelper = new SettingsHelper(this); |
| mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); |
| super.onCreate(); |
| } |
| |
| @Override |
| public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, |
| ParcelFileDescriptor newState) throws IOException { |
| |
| byte[] systemSettingsData = getSystemSettings(); |
| byte[] secureSettingsData = getSecureSettings(); |
| byte[] globalSettingsData = getGlobalSettings(); |
| byte[] lockSettingsData = getLockSettings(UserHandle.myUserId()); |
| byte[] locale = mSettingsHelper.getLocaleData(); |
| byte[] softApConfigData = getSoftAPConfiguration(); |
| byte[] netPoliciesData = getNetworkPolicies(); |
| byte[] wifiFullConfigData = getNewWifiConfigData(); |
| byte[] deviceSpecificInformation = getDeviceSpecificConfiguration(); |
| |
| long[] stateChecksums = readOldChecksums(oldState); |
| |
| stateChecksums[STATE_SYSTEM] = |
| writeIfChanged(stateChecksums[STATE_SYSTEM], KEY_SYSTEM, systemSettingsData, data); |
| stateChecksums[STATE_SECURE] = |
| writeIfChanged(stateChecksums[STATE_SECURE], KEY_SECURE, secureSettingsData, data); |
| stateChecksums[STATE_GLOBAL] = |
| writeIfChanged(stateChecksums[STATE_GLOBAL], KEY_GLOBAL, globalSettingsData, data); |
| stateChecksums[STATE_LOCALE] = |
| writeIfChanged(stateChecksums[STATE_LOCALE], KEY_LOCALE, locale, data); |
| stateChecksums[STATE_WIFI_SUPPLICANT] = 0; |
| stateChecksums[STATE_WIFI_CONFIG] = 0; |
| stateChecksums[STATE_LOCK_SETTINGS] = |
| writeIfChanged(stateChecksums[STATE_LOCK_SETTINGS], KEY_LOCK_SETTINGS, |
| lockSettingsData, data); |
| stateChecksums[STATE_SOFTAP_CONFIG] = |
| writeIfChanged(stateChecksums[STATE_SOFTAP_CONFIG], KEY_SOFTAP_CONFIG, |
| softApConfigData, data); |
| stateChecksums[STATE_NETWORK_POLICIES] = |
| writeIfChanged(stateChecksums[STATE_NETWORK_POLICIES], KEY_NETWORK_POLICIES, |
| netPoliciesData, data); |
| stateChecksums[STATE_WIFI_NEW_CONFIG] = |
| writeIfChanged(stateChecksums[STATE_WIFI_NEW_CONFIG], KEY_WIFI_NEW_CONFIG, |
| wifiFullConfigData, data); |
| stateChecksums[STATE_DEVICE_CONFIG] = |
| writeIfChanged(stateChecksums[STATE_DEVICE_CONFIG], KEY_DEVICE_SPECIFIC_CONFIG, |
| deviceSpecificInformation, data); |
| |
| writeNewChecksums(stateChecksums, newState); |
| } |
| |
| @Override |
| public void onRestore(BackupDataInput data, int appVersionCode, |
| ParcelFileDescriptor newState) { |
| throw new RuntimeException("SettingsBackupAgent has been migrated to use key exclusion"); |
| } |
| |
| @Override |
| public void onRestore(BackupDataInput data, long appVersionCode, |
| ParcelFileDescriptor newState, Set<String> dynamicBlockList) throws IOException { |
| |
| if (DEBUG) { |
| Log.d(TAG, "onRestore(): appVersionCode: " + appVersionCode |
| + "; Build.VERSION.SDK_INT: " + Build.VERSION.SDK_INT); |
| } |
| |
| boolean overrideRestoreAnyVersion = Settings.Global.getInt(getContentResolver(), |
| Settings.Global.OVERRIDE_SETTINGS_PROVIDER_RESTORE_ANY_VERSION, 0) == 1; |
| if ((appVersionCode > Build.VERSION.SDK_INT) && overrideRestoreAnyVersion) { |
| Log.w(TAG, "Ignoring restore from API" + appVersionCode + " to API" |
| + Build.VERSION.SDK_INT + " due to settings flag override."); |
| return; |
| } |
| |
| // versionCode of com.android.providers.settings corresponds to SDK_INT |
| mRestoredFromSdkInt = (int) appVersionCode; |
| |
| HashSet<String> movedToGlobal = new HashSet<String>(); |
| Settings.System.getMovedToGlobalSettings(movedToGlobal); |
| Settings.Secure.getMovedToGlobalSettings(movedToGlobal); |
| Set<String> movedToSecure = getMovedToSecureSettings(); |
| |
| Set<String> preservedGlobalSettings = getSettingsToPreserveInRestore( |
| Settings.Global.CONTENT_URI); |
| Set<String> preservedSecureSettings = getSettingsToPreserveInRestore( |
| Settings.Secure.CONTENT_URI); |
| Set<String> preservedSystemSettings = getSettingsToPreserveInRestore( |
| Settings.System.CONTENT_URI); |
| Set<String> preservedSettings = new HashSet<>(preservedGlobalSettings); |
| preservedSettings.addAll(preservedSecureSettings); |
| preservedSettings.addAll(preservedSystemSettings); |
| |
| byte[] restoredWifiSupplicantData = null; |
| byte[] restoredWifiIpConfigData = null; |
| |
| while (data.readNextHeader()) { |
| final String key = data.getKey(); |
| final int size = data.getDataSize(); |
| |
| // bail out of restoring from higher SDK_INT version for unsupported keys |
| if (appVersionCode > Build.VERSION.SDK_INT |
| && !RESTORE_FROM_HIGHER_SDK_INT_SUPPORTED_KEYS.contains(key)) { |
| Log.w(TAG, "Not restoring unrecognized key '" |
| + key + "' from future version " + appVersionCode); |
| data.skipEntityData(); |
| continue; |
| } |
| |
| switch (key) { |
| case KEY_SYSTEM : |
| restoreSettings(data, Settings.System.CONTENT_URI, movedToGlobal, |
| movedToSecure, R.array.restore_blocked_system_settings, |
| dynamicBlockList, |
| preservedSystemSettings); |
| mSettingsHelper.applyAudioSettings(); |
| break; |
| |
| case KEY_SECURE : |
| restoreSettings( |
| data, |
| Settings.Secure.CONTENT_URI, |
| movedToGlobal, |
| null, |
| R.array.restore_blocked_secure_settings, |
| dynamicBlockList, |
| preservedSecureSettings); |
| break; |
| |
| case KEY_GLOBAL : |
| restoreSettings( |
| data, |
| Settings.Global.CONTENT_URI, |
| null, |
| movedToSecure, |
| R.array.restore_blocked_global_settings, |
| dynamicBlockList, |
| preservedGlobalSettings); |
| break; |
| |
| case KEY_WIFI_SUPPLICANT : |
| restoredWifiSupplicantData = new byte[size]; |
| data.readEntityData(restoredWifiSupplicantData, 0, size); |
| break; |
| |
| case KEY_LOCALE : |
| byte[] localeData = new byte[size]; |
| data.readEntityData(localeData, 0, size); |
| mSettingsHelper.setLocaleData(localeData, size); |
| break; |
| |
| case KEY_WIFI_CONFIG : |
| restoredWifiIpConfigData = new byte[size]; |
| data.readEntityData(restoredWifiIpConfigData, 0, size); |
| break; |
| |
| case KEY_LOCK_SETTINGS : |
| restoreLockSettings(UserHandle.myUserId(), data); |
| break; |
| |
| case KEY_SOFTAP_CONFIG : |
| byte[] softapData = new byte[size]; |
| data.readEntityData(softapData, 0, size); |
| restoreSoftApConfiguration(softapData); |
| break; |
| |
| case KEY_NETWORK_POLICIES: |
| byte[] netPoliciesData = new byte[size]; |
| data.readEntityData(netPoliciesData, 0, size); |
| restoreNetworkPolicies(netPoliciesData); |
| break; |
| |
| case KEY_WIFI_NEW_CONFIG: |
| byte[] restoredWifiNewConfigData = new byte[size]; |
| data.readEntityData(restoredWifiNewConfigData, 0, size); |
| restoreNewWifiConfigData(restoredWifiNewConfigData); |
| break; |
| |
| case KEY_DEVICE_SPECIFIC_CONFIG: |
| byte[] restoredDeviceSpecificConfig = new byte[size]; |
| data.readEntityData(restoredDeviceSpecificConfig, 0, size); |
| restoreDeviceSpecificConfig( |
| restoredDeviceSpecificConfig, |
| R.array.restore_blocked_device_specific_settings, |
| dynamicBlockList, |
| preservedSettings); |
| break; |
| |
| default : |
| data.skipEntityData(); |
| |
| } |
| } |
| |
| // Do this at the end so that we also pull in the ipconfig data. |
| if (restoredWifiSupplicantData != null) { |
| restoreSupplicantWifiConfigData( |
| restoredWifiSupplicantData, restoredWifiIpConfigData); |
| } |
| } |
| |
| @Override |
| public void onFullBackup(FullBackupDataOutput data) throws IOException { |
| // Full backup of SettingsBackupAgent support was removed in Android P. If you want to adb |
| // backup com.android.providers.settings package use \"-keyvalue\" flag. |
| // Full restore of SettingsBackupAgent is still available for backwards compatibility. |
| } |
| |
| @Override |
| public void onRestoreFile(ParcelFileDescriptor data, long size, |
| int type, String domain, String relpath, long mode, long mtime) |
| throws IOException { |
| if (DEBUG_BACKUP) Log.d(TAG, "onRestoreFile() invoked"); |
| // Our data is actually a blob of flattened settings data identical to that |
| // produced during incremental backups. Just unpack and apply it all in |
| // turn. |
| FileInputStream instream = new FileInputStream(data.getFileDescriptor()); |
| DataInputStream in = new DataInputStream(instream); |
| |
| int version = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, "Flattened data version " + version); |
| if (version <= FULL_BACKUP_VERSION) { |
| // Generate the moved-to-global lookup table |
| HashSet<String> movedToGlobal = new HashSet<String>(); |
| Settings.System.getMovedToGlobalSettings(movedToGlobal); |
| Settings.Secure.getMovedToGlobalSettings(movedToGlobal); |
| Set<String> movedToSecure = getMovedToSecureSettings(); |
| |
| // system settings data first |
| int nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of settings data"); |
| byte[] buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| restoreSettings(buffer, nBytes, Settings.System.CONTENT_URI, movedToGlobal, |
| movedToSecure, R.array.restore_blocked_system_settings, |
| Collections.emptySet(), Collections.emptySet()); |
| |
| // secure settings |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of secure settings data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| restoreSettings( |
| buffer, |
| nBytes, |
| Settings.Secure.CONTENT_URI, |
| movedToGlobal, |
| null, |
| R.array.restore_blocked_secure_settings, |
| Collections.emptySet(), Collections.emptySet()); |
| |
| // Global only if sufficiently new |
| if (version >= FULL_BACKUP_ADDED_GLOBAL) { |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of global settings data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| movedToGlobal.clear(); // no redirection; this *is* the global namespace |
| restoreSettings(buffer, nBytes, Settings.Global.CONTENT_URI, movedToGlobal, |
| movedToSecure, R.array.restore_blocked_global_settings, |
| Collections.emptySet(), Collections.emptySet()); |
| } |
| |
| // locale |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of locale data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| mSettingsHelper.setLocaleData(buffer, nBytes); |
| |
| // Restore older backups performing the necessary migrations. |
| if (version < FULL_BACKUP_ADDED_WIFI_NEW) { |
| // wifi supplicant |
| int supplicant_size = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, supplicant_size + " bytes of wifi supplicant data"); |
| byte[] supplicant_buffer = new byte[supplicant_size]; |
| in.readFully(supplicant_buffer, 0, supplicant_size); |
| |
| // ip config |
| int ipconfig_size = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, ipconfig_size + " bytes of ip config data"); |
| byte[] ipconfig_buffer = new byte[ipconfig_size]; |
| in.readFully(ipconfig_buffer, 0, nBytes); |
| restoreSupplicantWifiConfigData(supplicant_buffer, ipconfig_buffer); |
| } |
| |
| if (version >= FULL_BACKUP_ADDED_LOCK_SETTINGS) { |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of lock settings data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| if (nBytes > 0) { |
| in.readFully(buffer, 0, nBytes); |
| restoreLockSettings(UserHandle.myUserId(), buffer, nBytes); |
| } |
| } |
| // softap config |
| if (version >= FULL_BACKUP_ADDED_SOFTAP_CONF) { |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of softap config data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| if (nBytes > 0) { |
| in.readFully(buffer, 0, nBytes); |
| restoreSoftApConfiguration(buffer); |
| } |
| } |
| // network policies |
| if (version >= FULL_BACKUP_ADDED_NETWORK_POLICIES) { |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of network policies data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| if (nBytes > 0) { |
| in.readFully(buffer, 0, nBytes); |
| restoreNetworkPolicies(buffer); |
| } |
| } |
| // Restore full wifi config data |
| if (version >= FULL_BACKUP_ADDED_WIFI_NEW) { |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of full wifi config data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| restoreNewWifiConfigData(buffer); |
| } |
| |
| if (DEBUG_BACKUP) Log.d(TAG, "Full restore complete."); |
| } else { |
| data.close(); |
| throw new IOException("Invalid file schema"); |
| } |
| } |
| |
| private Set<String> getMovedToSecureSettings() { |
| Set<String> movedToSecureSettings = new HashSet<>(); |
| Settings.Global.getMovedToSecureSettings(movedToSecureSettings); |
| Settings.System.getMovedToSecureSettings(movedToSecureSettings); |
| return movedToSecureSettings; |
| } |
| |
| private long[] readOldChecksums(ParcelFileDescriptor oldState) throws IOException { |
| long[] stateChecksums = new long[STATE_SIZE]; |
| |
| DataInputStream dataInput = new DataInputStream( |
| new FileInputStream(oldState.getFileDescriptor())); |
| |
| try { |
| int stateVersion = dataInput.readInt(); |
| if (stateVersion > STATE_VERSION) { |
| // Constrain the maximum state version this backup agent |
| // can handle in case a newer or corrupt backup set existed |
| stateVersion = STATE_VERSION; |
| } |
| for (int i = 0; i < STATE_SIZES[stateVersion]; i++) { |
| stateChecksums[i] = dataInput.readLong(); |
| } |
| } catch (EOFException eof) { |
| // With the default 0 checksum we'll wind up forcing a backup of |
| // any unhandled data sets, which is appropriate. |
| } |
| dataInput.close(); |
| return stateChecksums; |
| } |
| |
| private void writeNewChecksums(long[] checksums, ParcelFileDescriptor newState) |
| throws IOException { |
| DataOutputStream dataOutput = new DataOutputStream( |
| new BufferedOutputStream(new FileOutputStream(newState.getFileDescriptor()))); |
| |
| dataOutput.writeInt(STATE_VERSION); |
| for (int i = 0; i < STATE_SIZE; i++) { |
| dataOutput.writeLong(checksums[i]); |
| } |
| dataOutput.close(); |
| } |
| |
| private long writeIfChanged(long oldChecksum, String key, byte[] data, |
| BackupDataOutput output) { |
| CRC32 checkSummer = new CRC32(); |
| checkSummer.update(data); |
| long newChecksum = checkSummer.getValue(); |
| if (oldChecksum == newChecksum) { |
| return oldChecksum; |
| } |
| try { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Writing entity " + key + " of size " + data.length); |
| } |
| output.writeEntityHeader(key, data.length); |
| output.writeEntityData(data, data.length); |
| } catch (IOException ioe) { |
| // Bail |
| } |
| return newChecksum; |
| } |
| |
| private byte[] getSystemSettings() { |
| Cursor cursor = getContentResolver().query(Settings.System.CONTENT_URI, PROJECTION, null, |
| null, null); |
| try { |
| return extractRelevantValues(cursor, SystemSettings.SETTINGS_TO_BACKUP); |
| } finally { |
| cursor.close(); |
| } |
| } |
| |
| private byte[] getSecureSettings() { |
| Cursor cursor = getContentResolver().query(Settings.Secure.CONTENT_URI, PROJECTION, null, |
| null, null); |
| try { |
| return extractRelevantValues(cursor, SecureSettings.SETTINGS_TO_BACKUP); |
| } finally { |
| cursor.close(); |
| } |
| } |
| |
| private byte[] getGlobalSettings() { |
| Cursor cursor = getContentResolver().query(Settings.Global.CONTENT_URI, PROJECTION, null, |
| null, null); |
| try { |
| return extractRelevantValues(cursor, GlobalSettings.SETTINGS_TO_BACKUP); |
| } finally { |
| cursor.close(); |
| } |
| } |
| |
| /** |
| * Get names of the settings for which the current value should be preserved during restore. |
| */ |
| private Set<String> getSettingsToPreserveInRestore(Uri settingsUri) { |
| if (!FeatureFlagUtils.isEnabled(getBaseContext(), |
| FeatureFlagUtils.SETTINGS_DO_NOT_RESTORE_PRESERVED)) { |
| return Collections.emptySet(); |
| } |
| |
| Cursor cursor = getContentResolver().query(settingsUri, new String[] { |
| Settings.NameValueTable.NAME, Settings.NameValueTable.IS_PRESERVED_IN_RESTORE }, |
| /* selection */ null, /* selectionArgs */ null, /* sortOrder */ null); |
| |
| if (!cursor.moveToFirst()) { |
| Slog.i(TAG, "No settings to be preserved in restore"); |
| return Collections.emptySet(); |
| } |
| |
| int nameIndex = cursor.getColumnIndex(Settings.NameValueTable.NAME); |
| int isPreservedIndex = cursor.getColumnIndex( |
| Settings.NameValueTable.IS_PRESERVED_IN_RESTORE); |
| |
| Set<String> preservedSettings = new HashSet<>(); |
| while (!cursor.isAfterLast()) { |
| if (Boolean.parseBoolean(cursor.getString(isPreservedIndex))) { |
| preservedSettings.add(getQualifiedKeyForSetting(cursor.getString(nameIndex), |
| settingsUri)); |
| } |
| cursor.moveToNext(); |
| } |
| |
| return preservedSettings; |
| } |
| |
| /** |
| * Serialize the owner info and other lock settings |
| */ |
| private byte[] getLockSettings(@UserIdInt int userId) { |
| final LockPatternUtils lockPatternUtils = new LockPatternUtils(this); |
| final boolean ownerInfoEnabled = lockPatternUtils.isOwnerInfoEnabled(userId); |
| final String ownerInfo = lockPatternUtils.getOwnerInfo(userId); |
| final boolean lockPatternEnabled = lockPatternUtils.isLockPatternEnabled(userId); |
| final boolean visiblePatternEnabled = lockPatternUtils.isVisiblePatternEnabled(userId); |
| final boolean powerButtonInstantlyLocks = |
| lockPatternUtils.getPowerButtonInstantlyLocks(userId); |
| |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| DataOutputStream out = new DataOutputStream(baos); |
| try { |
| out.writeUTF(KEY_LOCK_SETTINGS_OWNER_INFO_ENABLED); |
| out.writeUTF(ownerInfoEnabled ? "1" : "0"); |
| if (ownerInfo != null) { |
| out.writeUTF(KEY_LOCK_SETTINGS_OWNER_INFO); |
| out.writeUTF(ownerInfo != null ? ownerInfo : ""); |
| } |
| if (lockPatternUtils.isVisiblePatternEverChosen(userId)) { |
| out.writeUTF(KEY_LOCK_SETTINGS_VISIBLE_PATTERN_ENABLED); |
| out.writeUTF(visiblePatternEnabled ? "1" : "0"); |
| } |
| if (lockPatternUtils.isPowerButtonInstantlyLocksEverChosen(userId)) { |
| out.writeUTF(KEY_LOCK_SETTINGS_POWER_BUTTON_INSTANTLY_LOCKS); |
| out.writeUTF(powerButtonInstantlyLocks ? "1" : "0"); |
| } |
| // End marker |
| out.writeUTF(""); |
| out.flush(); |
| } catch (IOException ioe) { |
| } |
| return baos.toByteArray(); |
| } |
| |
| private void restoreSettings( |
| BackupDataInput data, |
| Uri contentUri, |
| HashSet<String> movedToGlobal, |
| Set<String> movedToSecure, |
| int blockedSettingsArrayId, |
| Set<String> dynamicBlockList, |
| Set<String> settingsToPreserve) { |
| byte[] settings = new byte[data.getDataSize()]; |
| try { |
| data.readEntityData(settings, 0, settings.length); |
| } catch (IOException ioe) { |
| Log.e(TAG, "Couldn't read entity data"); |
| return; |
| } |
| restoreSettings( |
| settings, |
| settings.length, |
| contentUri, |
| movedToGlobal, |
| movedToSecure, |
| blockedSettingsArrayId, |
| dynamicBlockList, |
| settingsToPreserve); |
| } |
| |
| private void restoreSettings( |
| byte[] settings, |
| int bytes, |
| Uri contentUri, |
| HashSet<String> movedToGlobal, |
| Set<String> movedToSecure, |
| int blockedSettingsArrayId, |
| Set<String> dynamicBlockList, |
| Set<String> settingsToPreserve) { |
| restoreSettings( |
| settings, |
| 0, |
| bytes, |
| contentUri, |
| movedToGlobal, |
| movedToSecure, |
| blockedSettingsArrayId, |
| dynamicBlockList, |
| settingsToPreserve); |
| } |
| |
| @VisibleForTesting |
| void restoreSettings( |
| byte[] settings, |
| int pos, |
| int bytes, |
| Uri contentUri, |
| HashSet<String> movedToGlobal, |
| Set<String> movedToSecure, |
| int blockedSettingsArrayId, |
| Set<String> dynamicBlockList, |
| Set<String> settingsToPreserve) { |
| if (DEBUG) { |
| Log.i(TAG, "restoreSettings: " + contentUri); |
| } |
| |
| SettingsBackupWhitelist whitelist = getBackupWhitelist(contentUri); |
| |
| // Restore only the white list data. |
| final ArrayMap<String, String> cachedEntries = new ArrayMap<>(); |
| ContentValues contentValues = new ContentValues(2); |
| SettingsHelper settingsHelper = mSettingsHelper; |
| ContentResolver cr = getContentResolver(); |
| |
| Set<String> blockedSettings = getBlockedSettings(blockedSettingsArrayId); |
| |
| for (String key : whitelist.mSettingsWhitelist) { |
| boolean isBlockedBySystem = blockedSettings != null && blockedSettings.contains(key); |
| if (isBlockedBySystem || isBlockedByDynamicList(dynamicBlockList, contentUri, key)) { |
| Log.i( |
| TAG, |
| "Key " |
| + key |
| + " removed from restore by " |
| + (isBlockedBySystem ? "system" : "dynamic") |
| + " block list"); |
| continue; |
| } |
| |
| if (settingsToPreserve.contains(getQualifiedKeyForSetting(key, contentUri))) { |
| Log.i(TAG, "Skipping restore for setting " + key + " as it is marked as " |
| + "preserved"); |
| continue; |
| } |
| |
| String value = null; |
| boolean hasValueToRestore = false; |
| if (cachedEntries.indexOfKey(key) >= 0) { |
| value = cachedEntries.remove(key); |
| hasValueToRestore = true; |
| } else { |
| // If the value not cached, let us look it up. |
| while (pos < bytes) { |
| int length = readInt(settings, pos); |
| pos += INTEGER_BYTE_COUNT; |
| String dataKey = length >= 0 ? new String(settings, pos, length) : null; |
| pos += length; |
| length = readInt(settings, pos); |
| pos += INTEGER_BYTE_COUNT; |
| String dataValue = null; |
| if (length >= 0) { |
| dataValue = new String(settings, pos, length); |
| pos += length; |
| } |
| if (key.equals(dataKey)) { |
| value = dataValue; |
| hasValueToRestore = true; |
| break; |
| } |
| cachedEntries.put(dataKey, dataValue); |
| } |
| } |
| |
| if (!hasValueToRestore) { |
| continue; |
| } |
| |
| // only restore the settings that have valid values |
| if (!isValidSettingValue(key, value, whitelist.mSettingsValidators)) { |
| Log.w(TAG, "Attempted restore of " + key + " setting, but its value didn't pass" |
| + " validation, value: " + value); |
| continue; |
| } |
| |
| final Uri destination; |
| if (movedToGlobal != null && movedToGlobal.contains(key)) { |
| destination = Settings.Global.CONTENT_URI; |
| } else if (movedToSecure != null && movedToSecure.contains(key)) { |
| destination = Settings.Secure.CONTENT_URI; |
| } else { |
| destination = contentUri; |
| } |
| settingsHelper.restoreValue(this, cr, contentValues, destination, key, value, |
| mRestoredFromSdkInt); |
| |
| if (DEBUG) { |
| Log.d(TAG, "Restored setting: " + destination + " : " + key + "=" + value); |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| SettingsBackupWhitelist getBackupWhitelist(Uri contentUri) { |
| // Figure out the white list and redirects to the global table. We restore anything |
| // in either the backup whitelist or the legacy-restore whitelist for this table. |
| String[] whitelist; |
| Map<String, Validator> validators = null; |
| if (contentUri.equals(Settings.Secure.CONTENT_URI)) { |
| whitelist = ArrayUtils.concatElements(String.class, SecureSettings.SETTINGS_TO_BACKUP, |
| Settings.Secure.LEGACY_RESTORE_SETTINGS, |
| DeviceSpecificSettings.DEVICE_SPECIFIC_SETTINGS_TO_BACKUP); |
| validators = SecureSettingsValidators.VALIDATORS; |
| } else if (contentUri.equals(Settings.System.CONTENT_URI)) { |
| whitelist = ArrayUtils.concatElements(String.class, SystemSettings.SETTINGS_TO_BACKUP, |
| Settings.System.LEGACY_RESTORE_SETTINGS); |
| validators = SystemSettingsValidators.VALIDATORS; |
| } else if (contentUri.equals(Settings.Global.CONTENT_URI)) { |
| whitelist = ArrayUtils.concatElements(String.class, GlobalSettings.SETTINGS_TO_BACKUP, |
| Settings.Global.LEGACY_RESTORE_SETTINGS); |
| validators = GlobalSettingsValidators.VALIDATORS; |
| } else { |
| throw new IllegalArgumentException("Unknown URI: " + contentUri); |
| } |
| |
| return new SettingsBackupWhitelist(whitelist, validators); |
| } |
| |
| private boolean isBlockedByDynamicList(Set<String> dynamicBlockList, Uri areaUri, String key) { |
| String contentKey = Uri.withAppendedPath(areaUri, key).toString(); |
| return dynamicBlockList.contains(contentKey); |
| } |
| |
| @VisibleForTesting |
| static String getQualifiedKeyForSetting(String settingName, Uri settingUri) { |
| return Uri.withAppendedPath(settingUri, settingName).toString(); |
| } |
| |
| // There may be other sources of blocked settings, so I'm separating out this |
| // code to make it easy to modify in the future. |
| @VisibleForTesting |
| protected Set<String> getBlockedSettings(int blockedSettingsArrayId) { |
| String[] blockedSettings = getResources().getStringArray(blockedSettingsArrayId); |
| return new HashSet<>(Arrays.asList(blockedSettings)); |
| } |
| |
| private boolean isValidSettingValue(String key, String value, |
| Map<String, Validator> validators) { |
| if (key == null || validators == null) { |
| return false; |
| } |
| Validator validator = validators.get(key); |
| return (validator != null) && validator.validate(value); |
| } |
| |
| /** |
| * Restores the owner info enabled and other settings in LockSettings. |
| * |
| * @param buffer |
| * @param nBytes |
| */ |
| private void restoreLockSettings(@UserIdInt int userId, byte[] buffer, int nBytes) { |
| final LockPatternUtils lockPatternUtils = new LockPatternUtils(this); |
| |
| ByteArrayInputStream bais = new ByteArrayInputStream(buffer, 0, nBytes); |
| DataInputStream in = new DataInputStream(bais); |
| try { |
| String key; |
| // Read until empty string marker |
| while ((key = in.readUTF()).length() > 0) { |
| final String value = in.readUTF(); |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Restoring lock_settings " + key + " = " + value); |
| } |
| switch (key) { |
| case KEY_LOCK_SETTINGS_OWNER_INFO_ENABLED: |
| lockPatternUtils.setOwnerInfoEnabled("1".equals(value), userId); |
| break; |
| case KEY_LOCK_SETTINGS_OWNER_INFO: |
| lockPatternUtils.setOwnerInfo(value, userId); |
| break; |
| case KEY_LOCK_SETTINGS_VISIBLE_PATTERN_ENABLED: |
| lockPatternUtils.reportPatternWasChosen(userId); |
| lockPatternUtils.setVisiblePatternEnabled("1".equals(value), userId); |
| break; |
| case KEY_LOCK_SETTINGS_POWER_BUTTON_INSTANTLY_LOCKS: |
| lockPatternUtils.setPowerButtonInstantlyLocks("1".equals(value), userId); |
| break; |
| } |
| } |
| in.close(); |
| } catch (IOException ioe) { |
| } |
| } |
| |
| private void restoreLockSettings(@UserIdInt int userId, BackupDataInput data) { |
| final byte[] settings = new byte[data.getDataSize()]; |
| try { |
| data.readEntityData(settings, 0, settings.length); |
| } catch (IOException ioe) { |
| Log.e(TAG, "Couldn't read entity data"); |
| return; |
| } |
| restoreLockSettings(userId, settings, settings.length); |
| } |
| |
| /** |
| * Given a cursor and a set of keys, extract the required keys and |
| * values and write them to a byte array. |
| * |
| * @param cursor A cursor with settings data. |
| * @param settings The settings to extract. |
| * @return The byte array of extracted values. |
| */ |
| private byte[] extractRelevantValues(Cursor cursor, String[] settings) { |
| if (!cursor.moveToFirst()) { |
| Log.e(TAG, "Couldn't read from the cursor"); |
| return new byte[0]; |
| } |
| |
| final int nameColumnIndex = cursor.getColumnIndex(Settings.NameValueTable.NAME); |
| final int valueColumnIndex = cursor.getColumnIndex(Settings.NameValueTable.VALUE); |
| |
| // Obtain the relevant data in a temporary array. |
| int totalSize = 0; |
| int backedUpSettingIndex = 0; |
| final int settingsCount = settings.length; |
| final byte[][] values = new byte[settingsCount * 2][]; // keys and values |
| final ArrayMap<String, String> cachedEntries = new ArrayMap<>(); |
| for (int i = 0; i < settingsCount; i++) { |
| final String key = settings[i]; |
| |
| // If the value not cached, let us look it up. |
| String value = null; |
| boolean hasValueToBackup = false; |
| if (cachedEntries.indexOfKey(key) >= 0) { |
| value = cachedEntries.remove(key); |
| hasValueToBackup = true; |
| } else { |
| while (!cursor.isAfterLast()) { |
| final String cursorKey = cursor.getString(nameColumnIndex); |
| final String cursorValue = cursor.getString(valueColumnIndex); |
| cursor.moveToNext(); |
| if (key.equals(cursorKey)) { |
| value = cursorValue; |
| hasValueToBackup = true; |
| break; |
| } |
| cachedEntries.put(cursorKey, cursorValue); |
| } |
| } |
| |
| if (!hasValueToBackup) { |
| continue; |
| } |
| |
| // Intercept the keys and see if they need special handling |
| value = mSettingsHelper.onBackupValue(key, value); |
| |
| // Write the key and value in the intermediary array. |
| final byte[] keyBytes = key.getBytes(); |
| totalSize += INTEGER_BYTE_COUNT + keyBytes.length; |
| values[backedUpSettingIndex * 2] = keyBytes; |
| |
| final byte[] valueBytes = (value != null) ? value.getBytes() : NULL_VALUE; |
| totalSize += INTEGER_BYTE_COUNT + valueBytes.length; |
| values[backedUpSettingIndex * 2 + 1] = valueBytes; |
| |
| backedUpSettingIndex++; |
| |
| if (DEBUG) { |
| Log.d(TAG, "Backed up setting: " + key + "=" + value); |
| } |
| } |
| |
| // Aggregate the result. |
| byte[] result = new byte[totalSize]; |
| int pos = 0; |
| final int keyValuePairCount = backedUpSettingIndex * 2; |
| for (int i = 0; i < keyValuePairCount; i++) { |
| final byte[] value = values[i]; |
| if (value != NULL_VALUE) { |
| pos = writeInt(result, pos, value.length); |
| pos = writeBytes(result, pos, value); |
| } else { |
| pos = writeInt(result, pos, NULL_SIZE); |
| } |
| } |
| return result; |
| } |
| |
| private void restoreSupplicantWifiConfigData(byte[] supplicant_bytes, byte[] ipconfig_bytes) { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Applying restored supplicant wifi data"); |
| } |
| mWifiManager.restoreSupplicantBackupData(supplicant_bytes, ipconfig_bytes); |
| } |
| |
| private byte[] getSoftAPConfiguration() { |
| return mWifiManager.retrieveSoftApBackupData(); |
| } |
| |
| private void restoreSoftApConfiguration(byte[] data) { |
| SoftApConfiguration configInCloud = mWifiManager.restoreSoftApBackupData(data); |
| if (configInCloud != null) { |
| if (DEBUG) Log.d(TAG, "Successfully unMarshaled SoftApConfiguration "); |
| // Depending on device hardware, we may need to notify the user of a setting change |
| SoftApConfiguration storedConfig = mWifiManager.getSoftApConfiguration(); |
| if (!storedConfig.equals(configInCloud)) { |
| Log.d(TAG, "restored ap configuration requires a conversion, notify the user"); |
| WifiSoftApConfigChangedNotifier.notifyUserOfConfigConversion(this); |
| } |
| } |
| } |
| |
| private byte[] getNetworkPolicies() { |
| NetworkPolicyManager networkPolicyManager = |
| (NetworkPolicyManager) getSystemService(NETWORK_POLICY_SERVICE); |
| NetworkPolicy[] policies = networkPolicyManager.getNetworkPolicies(); |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| if (policies != null && policies.length != 0) { |
| DataOutputStream out = new DataOutputStream(baos); |
| try { |
| out.writeInt(NETWORK_POLICIES_BACKUP_VERSION); |
| out.writeInt(policies.length); |
| for (NetworkPolicy policy : policies) { |
| // We purposefully only backup policies that the user has |
| // defined; any inferred policies might include |
| // carrier-protected data that we can't export. |
| if (policy != null && !policy.inferred) { |
| byte[] marshaledPolicy = policy.getBytesForBackup(); |
| out.writeByte(BackupUtils.NOT_NULL); |
| out.writeInt(marshaledPolicy.length); |
| out.write(marshaledPolicy); |
| } else { |
| out.writeByte(BackupUtils.NULL); |
| } |
| } |
| } catch (IOException ioe) { |
| Log.e(TAG, "Failed to convert NetworkPolicies to byte array " + ioe.getMessage()); |
| baos.reset(); |
| } |
| } |
| return baos.toByteArray(); |
| } |
| |
| private byte[] getNewWifiConfigData() { |
| return mWifiManager.retrieveBackupData(); |
| } |
| |
| private void restoreNewWifiConfigData(byte[] bytes) { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Applying restored wifi data"); |
| } |
| mWifiManager.restoreBackupData(bytes); |
| } |
| |
| private void restoreNetworkPolicies(byte[] data) { |
| NetworkPolicyManager networkPolicyManager = |
| (NetworkPolicyManager) getSystemService(NETWORK_POLICY_SERVICE); |
| if (data != null && data.length != 0) { |
| DataInputStream in = new DataInputStream(new ByteArrayInputStream(data)); |
| try { |
| int version = in.readInt(); |
| if (version < 1 || version > NETWORK_POLICIES_BACKUP_VERSION) { |
| throw new BackupUtils.BadVersionException( |
| "Unknown Backup Serialization Version"); |
| } |
| int length = in.readInt(); |
| NetworkPolicy[] policies = new NetworkPolicy[length]; |
| for (int i = 0; i < length; i++) { |
| byte isNull = in.readByte(); |
| if (isNull == BackupUtils.NULL) continue; |
| int byteLength = in.readInt(); |
| byte[] policyData = new byte[byteLength]; |
| in.read(policyData, 0, byteLength); |
| policies[i] = NetworkPolicy.getNetworkPolicyFromBackup( |
| new DataInputStream(new ByteArrayInputStream(policyData))); |
| } |
| // Only set the policies if there was no error in the restore operation |
| networkPolicyManager.setNetworkPolicies(policies); |
| } catch (NullPointerException | IOException | BackupUtils.BadVersionException |
| | DateTimeException e) { |
| // NPE can be thrown when trying to instantiate a NetworkPolicy |
| Log.e(TAG, "Failed to convert byte array to NetworkPolicies " + e.getMessage()); |
| } |
| } |
| } |
| |
| @VisibleForTesting |
| byte[] getDeviceSpecificConfiguration() throws IOException { |
| try (ByteArrayOutputStream os = new ByteArrayOutputStream()) { |
| writeHeader(os); |
| os.write(getDeviceSpecificSettings()); |
| return os.toByteArray(); |
| } |
| } |
| |
| @VisibleForTesting |
| void writeHeader(OutputStream os) throws IOException { |
| os.write(toByteArray(DEVICE_SPECIFIC_VERSION)); |
| os.write(toByteArray(Build.MANUFACTURER)); |
| os.write(toByteArray(Build.PRODUCT)); |
| } |
| |
| private byte[] getDeviceSpecificSettings() { |
| try (Cursor cursor = |
| getContentResolver() |
| .query(Settings.Secure.CONTENT_URI, PROJECTION, null, null, null)) { |
| return extractRelevantValues( |
| cursor, DeviceSpecificSettings.DEVICE_SPECIFIC_SETTINGS_TO_BACKUP); |
| } |
| } |
| |
| /** |
| * Restore the device specific settings. |
| * |
| * @param data The byte array holding a backed up version of another devices settings. |
| * @param blockedSettingsArrayId The string array resource holding the settings not to restore. |
| * @param dynamicBlocklist The dynamic list of settings not to restore fed into this agent. |
| * @return true if the restore succeeded, false if it was stopped. |
| */ |
| @VisibleForTesting |
| boolean restoreDeviceSpecificConfig(byte[] data, int blockedSettingsArrayId, |
| Set<String> dynamicBlocklist, Set<String> preservedSettings) { |
| // We're using an AtomicInteger to wrap the position int and allow called methods to |
| // modify it. |
| AtomicInteger pos = new AtomicInteger(0); |
| if (!isSourceAcceptable(data, pos)) { |
| return false; |
| } |
| |
| Integer originalDensity = getPreviousDensity(); |
| |
| int dataStart = pos.get(); |
| restoreSettings( |
| data, |
| dataStart, |
| data.length, |
| Settings.Secure.CONTENT_URI, |
| null, |
| null, |
| blockedSettingsArrayId, |
| dynamicBlocklist, |
| preservedSettings); |
| |
| updateWindowManagerIfNeeded(originalDensity); |
| |
| return true; |
| } |
| |
| private void updateWindowManagerIfNeeded(Integer previousDensity) { |
| int newDensity; |
| try { |
| newDensity = getForcedDensity(); |
| } catch (Settings.SettingNotFoundException e) { |
| // If there's not density setting we can't perform a change. |
| return; |
| } |
| |
| if (previousDensity == null || previousDensity != newDensity) { |
| // From nothing to something is a change. |
| DisplayDensityConfiguration.setForcedDisplayDensity( |
| Display.DEFAULT_DISPLAY, newDensity); |
| } |
| } |
| |
| private Integer getPreviousDensity() { |
| try { |
| return getForcedDensity(); |
| } catch (Settings.SettingNotFoundException e) { |
| return null; |
| } |
| } |
| |
| private int getForcedDensity() throws Settings.SettingNotFoundException { |
| return Settings.Secure.getInt(getContentResolver(), Settings.Secure.DISPLAY_DENSITY_FORCED); |
| } |
| |
| @VisibleForTesting |
| boolean isSourceAcceptable(byte[] data, AtomicInteger pos) { |
| int version = readInt(data, pos); |
| if (version > DEVICE_SPECIFIC_VERSION) { |
| Slog.w(TAG, "Unable to restore device specific information; Backup is too new"); |
| return false; |
| } |
| |
| String sourceManufacturer = readString(data, pos); |
| if (!Objects.equals(Build.MANUFACTURER, sourceManufacturer)) { |
| Log.w( |
| TAG, |
| "Unable to restore device specific information; Manufacturer mismatch " |
| + "(\'" |
| + Build.MANUFACTURER |
| + "\' and \'" |
| + sourceManufacturer |
| + "\')"); |
| return false; |
| } |
| |
| String sourceProduct = readString(data, pos); |
| if (!Objects.equals(Build.PRODUCT, sourceProduct)) { |
| Log.w( |
| TAG, |
| "Unable to restore device specific information; Product mismatch (\'" |
| + Build.PRODUCT |
| + "\' and \'" |
| + sourceProduct |
| + "\')"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| @VisibleForTesting |
| static byte[] toByteArray(String value) { |
| if (value == null) { |
| return toByteArray(NULL_SIZE); |
| } |
| |
| byte[] stringBytes = value.getBytes(); |
| byte[] sizeAndString = new byte[stringBytes.length + INTEGER_BYTE_COUNT]; |
| writeInt(sizeAndString, 0, stringBytes.length); |
| writeBytes(sizeAndString, INTEGER_BYTE_COUNT, stringBytes); |
| return sizeAndString; |
| } |
| |
| @VisibleForTesting |
| static byte[] toByteArray(int value) { |
| byte[] result = new byte[INTEGER_BYTE_COUNT]; |
| writeInt(result, 0, value); |
| return result; |
| } |
| |
| private String readString(byte[] data, AtomicInteger pos) { |
| int byteCount = readInt(data, pos); |
| if (byteCount == NULL_SIZE) { |
| return null; |
| } |
| |
| int stringStart = pos.getAndAdd(byteCount); |
| return new String(data, stringStart, byteCount); |
| } |
| |
| /** |
| * Write an int in BigEndian into the byte array. |
| * @param out byte array |
| * @param pos current pos in array |
| * @param value integer to write |
| * @return the index after adding the size of an int (4) in bytes. |
| */ |
| private static int writeInt(byte[] out, int pos, int value) { |
| out[pos + 0] = (byte) ((value >> 24) & 0xFF); |
| out[pos + 1] = (byte) ((value >> 16) & 0xFF); |
| out[pos + 2] = (byte) ((value >> 8) & 0xFF); |
| out[pos + 3] = (byte) ((value >> 0) & 0xFF); |
| return pos + INTEGER_BYTE_COUNT; |
| } |
| |
| private static int writeBytes(byte[] out, int pos, byte[] value) { |
| System.arraycopy(value, 0, out, pos, value.length); |
| return pos + value.length; |
| } |
| |
| private int readInt(byte[] in, AtomicInteger pos) { |
| return readInt(in, pos.getAndAdd(INTEGER_BYTE_COUNT)); |
| } |
| |
| private int readInt(byte[] in, int pos) { |
| int result = ((in[pos] & 0xFF) << 24) |
| | ((in[pos + 1] & 0xFF) << 16) |
| | ((in[pos + 2] & 0xFF) << 8) |
| | ((in[pos + 3] & 0xFF) << 0); |
| return result; |
| } |
| |
| /** |
| * Store the whitelist of settings to be backed up and validators for them. |
| */ |
| @VisibleForTesting |
| static class SettingsBackupWhitelist { |
| final String[] mSettingsWhitelist; |
| final Map<String, Validator> mSettingsValidators; |
| |
| |
| SettingsBackupWhitelist(String[] settingsWhitelist, |
| Map<String, Validator> settingsValidators) { |
| mSettingsWhitelist = settingsWhitelist; |
| mSettingsValidators = settingsValidators; |
| } |
| } |
| } |
