| /* |
| * 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.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.Uri; |
| import android.net.wifi.WifiManager; |
| import android.os.FileUtils; |
| import android.os.Handler; |
| import android.os.ParcelFileDescriptor; |
| import android.os.Process; |
| import android.provider.Settings; |
| import android.util.Log; |
| |
| import java.io.BufferedOutputStream; |
| import java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| import java.io.CharArrayReader; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| import java.io.EOFException; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.Writer; |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| 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 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"; |
| |
| // Versioning of the state file. Increment this version |
| // number any time the set of state items is altered. |
| private static final int STATE_VERSION = 3; |
| |
| // 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_SIZE = 6; // 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 |
| STATE_SIZE // version 3 added STATE_GLOBAL |
| }; |
| |
| // Versioning of the 'full backup' format |
| private static final int FULL_BACKUP_VERSION = 2; |
| private static final int FULL_BACKUP_ADDED_GLOBAL = 2; // added the "global" entry |
| |
| 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"; |
| |
| private static final int COLUMN_NAME = 1; |
| private static final int COLUMN_VALUE = 2; |
| |
| private static final String[] PROJECTION = { |
| Settings.NameValueTable._ID, |
| Settings.NameValueTable.NAME, |
| Settings.NameValueTable.VALUE |
| }; |
| |
| private static final String FILE_WIFI_SUPPLICANT = "/data/misc/wifi/wpa_supplicant.conf"; |
| private static final String FILE_WIFI_SUPPLICANT_TEMPLATE = |
| "/system/etc/wifi/wpa_supplicant.conf"; |
| |
| // 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"; |
| |
| // 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"; |
| |
| // Delay in milliseconds between the restore operation and when we will bounce |
| // wifi in order to rewrite the supplicant config etc. |
| private static final long WIFI_BOUNCE_DELAY_MILLIS = 60 * 1000; // one minute |
| |
| private SettingsHelper mSettingsHelper; |
| private WifiManager mWfm; |
| private static String mWifiConfigFile; |
| |
| WifiRestoreRunnable mWifiRestore = null; |
| |
| // Class for capturing a network definition from the wifi supplicant config file |
| static class Network { |
| String ssid = ""; // equals() and hashCode() need these to be non-null |
| String key_mgmt = ""; |
| final ArrayList<String> rawLines = new ArrayList<String>(); |
| |
| public static Network readFromStream(BufferedReader in) { |
| final Network n = new Network(); |
| String line; |
| try { |
| while (in.ready()) { |
| line = in.readLine(); |
| if (line == null || line.startsWith("}")) { |
| break; |
| } |
| n.rememberLine(line); |
| } |
| } catch (IOException e) { |
| return null; |
| } |
| return n; |
| } |
| |
| void rememberLine(String line) { |
| // can't rely on particular whitespace patterns so strip leading/trailing |
| line = line.trim(); |
| if (line.isEmpty()) return; // only whitespace; drop the line |
| rawLines.add(line); |
| |
| // remember the ssid and key_mgmt lines for duplicate culling |
| if (line.startsWith("ssid")) { |
| ssid = line; |
| } else if (line.startsWith("key_mgmt")) { |
| key_mgmt = line; |
| } |
| } |
| |
| public void write(Writer w) throws IOException { |
| w.write("\nnetwork={\n"); |
| for (String line : rawLines) { |
| w.write("\t" + line + "\n"); |
| } |
| w.write("}\n"); |
| } |
| |
| public void dump() { |
| Log.v(TAG, "network={"); |
| for (String line : rawLines) { |
| Log.v(TAG, " " + line); |
| } |
| Log.v(TAG, "}"); |
| } |
| |
| // Same approach as Pair.equals() and Pair.hashCode() |
| @Override |
| public boolean equals(Object o) { |
| if (o == this) return true; |
| if (!(o instanceof Network)) return false; |
| final Network other; |
| try { |
| other = (Network) o; |
| } catch (ClassCastException e) { |
| return false; |
| } |
| return ssid.equals(other.ssid) && key_mgmt.equals(other.key_mgmt); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = 17; |
| result = 31 * result + ssid.hashCode(); |
| result = 31 * result + key_mgmt.hashCode(); |
| return result; |
| } |
| } |
| |
| // Ingest multiple wifi config file fragments, looking for network={} blocks |
| // and eliminating duplicates |
| class WifiNetworkSettings { |
| // One for fast lookup, one for maintaining ordering |
| final HashSet<Network> mKnownNetworks = new HashSet<Network>(); |
| final ArrayList<Network> mNetworks = new ArrayList<Network>(8); |
| |
| public void readNetworks(BufferedReader in) { |
| try { |
| String line; |
| while (in.ready()) { |
| line = in.readLine(); |
| if (line != null) { |
| // Parse out 'network=' decls so we can ignore duplicates |
| if (line.startsWith("network")) { |
| Network net = Network.readFromStream(in); |
| if (! mKnownNetworks.contains(net)) { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Adding " + net.ssid + " / " + net.key_mgmt); |
| } |
| mKnownNetworks.add(net); |
| mNetworks.add(net); |
| } else { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Dupe; skipped " + net.ssid + " / " + net.key_mgmt); |
| } |
| } |
| } |
| } |
| } |
| } catch (IOException e) { |
| // whatever happened, we're done now |
| } |
| } |
| |
| public void write(Writer w) throws IOException { |
| for (Network net : mNetworks) { |
| net.write(w); |
| } |
| } |
| |
| public void dump() { |
| for (Network net : mNetworks) { |
| net.dump(); |
| } |
| } |
| } |
| |
| @Override |
| public void onCreate() { |
| if (DEBUG_BACKUP) Log.d(TAG, "onCreate() invoked"); |
| |
| mSettingsHelper = new SettingsHelper(this); |
| super.onCreate(); |
| |
| WifiManager mWfm = (WifiManager) getSystemService(Context.WIFI_SERVICE); |
| if (mWfm != null) mWifiConfigFile = mWfm.getConfigFile(); |
| } |
| |
| @Override |
| public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, |
| ParcelFileDescriptor newState) throws IOException { |
| |
| byte[] systemSettingsData = getSystemSettings(); |
| byte[] secureSettingsData = getSecureSettings(); |
| byte[] globalSettingsData = getGlobalSettings(); |
| byte[] locale = mSettingsHelper.getLocaleData(); |
| byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT); |
| byte[] wifiConfigData = getFileData(mWifiConfigFile); |
| |
| 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] = |
| writeIfChanged(stateChecksums[STATE_WIFI_SUPPLICANT], KEY_WIFI_SUPPLICANT, |
| wifiSupplicantData, data); |
| stateChecksums[STATE_WIFI_CONFIG] = |
| writeIfChanged(stateChecksums[STATE_WIFI_CONFIG], KEY_WIFI_CONFIG, wifiConfigData, |
| data); |
| |
| writeNewChecksums(stateChecksums, newState); |
| } |
| |
| class WifiRestoreRunnable implements Runnable { |
| private byte[] restoredSupplicantData; |
| private byte[] restoredWifiConfigFile; |
| |
| void incorporateWifiSupplicant(BackupDataInput data) { |
| restoredSupplicantData = new byte[data.getDataSize()]; |
| if (restoredSupplicantData.length <= 0) return; |
| try { |
| data.readEntityData(restoredSupplicantData, 0, data.getDataSize()); |
| } catch (IOException e) { |
| Log.w(TAG, "Unable to read supplicant data"); |
| restoredSupplicantData = null; |
| } |
| } |
| |
| void incorporateWifiConfigFile(BackupDataInput data) { |
| restoredWifiConfigFile = new byte[data.getDataSize()]; |
| if (restoredWifiConfigFile.length <= 0) return; |
| try { |
| data.readEntityData(restoredWifiConfigFile, 0, data.getDataSize()); |
| } catch (IOException e) { |
| Log.w(TAG, "Unable to read config file"); |
| restoredWifiConfigFile = null; |
| } |
| } |
| |
| @Override |
| public void run() { |
| if (restoredSupplicantData != null || restoredWifiConfigFile != null) { |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Starting deferred restore of wifi data"); |
| } |
| final ContentResolver cr = getContentResolver(); |
| final int scanAlways = Settings.Global.getInt(cr, |
| Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0); |
| final int retainedWifiState = enableWifi(false); |
| if (scanAlways != 0) { |
| Settings.Global.putInt(cr, |
| Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0); |
| // !!! Give the wifi stack a moment to quiesce |
| try { Thread.sleep(1000); } catch (InterruptedException e) {} |
| } |
| if (restoredSupplicantData != null) { |
| restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, |
| restoredSupplicantData, restoredSupplicantData.length); |
| FileUtils.setPermissions(FILE_WIFI_SUPPLICANT, |
| FileUtils.S_IRUSR | FileUtils.S_IWUSR | |
| FileUtils.S_IRGRP | FileUtils.S_IWGRP, |
| Process.myUid(), Process.WIFI_UID); |
| } |
| if (restoredWifiConfigFile != null) { |
| restoreFileData(mWifiConfigFile, |
| restoredWifiConfigFile, restoredWifiConfigFile.length); |
| } |
| // restore the previous WIFI state. |
| if (scanAlways != 0) { |
| Settings.Global.putInt(cr, |
| Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, scanAlways); |
| } |
| enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED || |
| retainedWifiState == WifiManager.WIFI_STATE_ENABLING); |
| } |
| } |
| } |
| |
| // Instantiate the wifi-config restore runnable, scheduling it for execution |
| // a minute hence |
| void initWifiRestoreIfNecessary() { |
| if (mWifiRestore == null) { |
| mWifiRestore = new WifiRestoreRunnable(); |
| } |
| } |
| |
| @Override |
| public void onRestore(BackupDataInput data, int appVersionCode, |
| ParcelFileDescriptor newState) throws IOException { |
| |
| HashSet<String> movedToGlobal = new HashSet<String>(); |
| Settings.System.getMovedKeys(movedToGlobal); |
| Settings.Secure.getMovedKeys(movedToGlobal); |
| |
| while (data.readNextHeader()) { |
| final String key = data.getKey(); |
| final int size = data.getDataSize(); |
| if (KEY_SYSTEM.equals(key)) { |
| restoreSettings(data, Settings.System.CONTENT_URI, movedToGlobal); |
| mSettingsHelper.applyAudioSettings(); |
| } else if (KEY_SECURE.equals(key)) { |
| restoreSettings(data, Settings.Secure.CONTENT_URI, movedToGlobal); |
| } else if (KEY_GLOBAL.equals(key)) { |
| restoreSettings(data, Settings.Global.CONTENT_URI, null); |
| } else if (KEY_WIFI_SUPPLICANT.equals(key)) { |
| initWifiRestoreIfNecessary(); |
| mWifiRestore.incorporateWifiSupplicant(data); |
| } else if (KEY_LOCALE.equals(key)) { |
| byte[] localeData = new byte[size]; |
| data.readEntityData(localeData, 0, size); |
| mSettingsHelper.setLocaleData(localeData, size); |
| } else if (KEY_WIFI_CONFIG.equals(key)) { |
| initWifiRestoreIfNecessary(); |
| mWifiRestore.incorporateWifiConfigFile(data); |
| } else { |
| data.skipEntityData(); |
| } |
| } |
| |
| // If we have wifi data to restore, post a runnable to perform the |
| // bounce-and-update operation a little ways in the future. |
| if (mWifiRestore != null) { |
| new Handler(getMainLooper()).postDelayed(mWifiRestore, WIFI_BOUNCE_DELAY_MILLIS); |
| } |
| } |
| |
| @Override |
| public void onFullBackup(FullBackupDataOutput data) throws IOException { |
| byte[] systemSettingsData = getSystemSettings(); |
| byte[] secureSettingsData = getSecureSettings(); |
| byte[] globalSettingsData = getGlobalSettings(); |
| byte[] locale = mSettingsHelper.getLocaleData(); |
| byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT); |
| byte[] wifiConfigData = getFileData(mWifiConfigFile); |
| |
| // Write the data to the staging file, then emit that as our tarfile |
| // representation of the backed-up settings. |
| String root = getFilesDir().getAbsolutePath(); |
| File stage = new File(root, STAGE_FILE); |
| try { |
| FileOutputStream filestream = new FileOutputStream(stage); |
| BufferedOutputStream bufstream = new BufferedOutputStream(filestream); |
| DataOutputStream out = new DataOutputStream(bufstream); |
| |
| if (DEBUG_BACKUP) Log.d(TAG, "Writing flattened data version " + FULL_BACKUP_VERSION); |
| out.writeInt(FULL_BACKUP_VERSION); |
| |
| if (DEBUG_BACKUP) Log.d(TAG, systemSettingsData.length + " bytes of settings data"); |
| out.writeInt(systemSettingsData.length); |
| out.write(systemSettingsData); |
| if (DEBUG_BACKUP) Log.d(TAG, secureSettingsData.length + " bytes of secure settings data"); |
| out.writeInt(secureSettingsData.length); |
| out.write(secureSettingsData); |
| if (DEBUG_BACKUP) Log.d(TAG, globalSettingsData.length + " bytes of global settings data"); |
| out.writeInt(globalSettingsData.length); |
| out.write(globalSettingsData); |
| if (DEBUG_BACKUP) Log.d(TAG, locale.length + " bytes of locale data"); |
| out.writeInt(locale.length); |
| out.write(locale); |
| if (DEBUG_BACKUP) Log.d(TAG, wifiSupplicantData.length + " bytes of wifi supplicant data"); |
| out.writeInt(wifiSupplicantData.length); |
| out.write(wifiSupplicantData); |
| if (DEBUG_BACKUP) Log.d(TAG, wifiConfigData.length + " bytes of wifi config data"); |
| out.writeInt(wifiConfigData.length); |
| out.write(wifiConfigData); |
| |
| out.flush(); // also flushes downstream |
| |
| // now we're set to emit the tar stream |
| fullBackupFile(stage, data); |
| } finally { |
| stage.delete(); |
| } |
| } |
| |
| @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.getMovedKeys(movedToGlobal); |
| Settings.Secure.getMovedKeys(movedToGlobal); |
| |
| // 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); |
| |
| // 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); |
| |
| // 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); |
| } |
| |
| // 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); |
| |
| // wifi supplicant |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi supplicant data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| int retainedWifiState = enableWifi(false); |
| restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, buffer, nBytes); |
| FileUtils.setPermissions(FILE_WIFI_SUPPLICANT, |
| FileUtils.S_IRUSR | FileUtils.S_IWUSR | |
| FileUtils.S_IRGRP | FileUtils.S_IWGRP, |
| Process.myUid(), Process.WIFI_UID); |
| // retain the previous WIFI state. |
| enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED || |
| retainedWifiState == WifiManager.WIFI_STATE_ENABLING); |
| |
| // wifi config |
| nBytes = in.readInt(); |
| if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi config data"); |
| if (nBytes > buffer.length) buffer = new byte[nBytes]; |
| in.readFully(buffer, 0, nBytes); |
| restoreFileData(mWifiConfigFile, buffer, nBytes); |
| |
| if (DEBUG_BACKUP) Log.d(TAG, "Full restore complete."); |
| } else { |
| data.close(); |
| throw new IOException("Invalid file schema"); |
| } |
| } |
| |
| 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(); |
| 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 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 { |
| 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, Settings.System.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, Settings.Secure.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, Settings.Global.SETTINGS_TO_BACKUP); |
| } finally { |
| cursor.close(); |
| } |
| } |
| |
| private void restoreSettings(BackupDataInput data, Uri contentUri, |
| HashSet<String> movedToGlobal) { |
| 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); |
| } |
| |
| private void restoreSettings(byte[] settings, int bytes, Uri contentUri, |
| HashSet<String> movedToGlobal) { |
| if (DEBUG) { |
| Log.i(TAG, "restoreSettings: " + contentUri); |
| } |
| |
| // Figure out the white list and redirects to the global table. |
| String[] whitelist = null; |
| if (contentUri.equals(Settings.Secure.CONTENT_URI)) { |
| whitelist = Settings.Secure.SETTINGS_TO_BACKUP; |
| } else if (contentUri.equals(Settings.System.CONTENT_URI)) { |
| whitelist = Settings.System.SETTINGS_TO_BACKUP; |
| } else if (contentUri.equals(Settings.Global.CONTENT_URI)) { |
| whitelist = Settings.Global.SETTINGS_TO_BACKUP; |
| } else { |
| throw new IllegalArgumentException("Unknown URI: " + contentUri); |
| } |
| |
| // Restore only the white list data. |
| int pos = 0; |
| Map<String, String> cachedEntries = new HashMap<String, String>(); |
| ContentValues contentValues = new ContentValues(2); |
| SettingsHelper settingsHelper = mSettingsHelper; |
| |
| final int whiteListSize = whitelist.length; |
| for (int i = 0; i < whiteListSize; i++) { |
| String key = whitelist[i]; |
| String value = cachedEntries.remove(key); |
| |
| // If the value not cached, let us look it up. |
| if (value == null) { |
| 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 = length > 0 ? new String(settings, pos, length) : null; |
| pos += length; |
| if (key.equals(dataKey)) { |
| value = dataValue; |
| break; |
| } |
| cachedEntries.put(dataKey, dataValue); |
| } |
| } |
| |
| if (value == null) { |
| continue; |
| } |
| |
| final Uri destination = (movedToGlobal != null && movedToGlobal.contains(key)) |
| ? Settings.Global.CONTENT_URI |
| : contentUri; |
| |
| // The helper doesn't care what namespace the keys are in |
| if (settingsHelper.restoreValue(key, value)) { |
| contentValues.clear(); |
| contentValues.put(Settings.NameValueTable.NAME, key); |
| contentValues.put(Settings.NameValueTable.VALUE, value); |
| getContentResolver().insert(destination, contentValues); |
| } |
| |
| if (DEBUG) { |
| Log.d(TAG, "Restored setting: " + destination + " : "+ key + "=" + value); |
| } |
| } |
| } |
| |
| /** |
| * 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) { |
| final int settingsCount = settings.length; |
| byte[][] values = new byte[settingsCount * 2][]; // keys and values |
| if (!cursor.moveToFirst()) { |
| Log.e(TAG, "Couldn't read from the cursor"); |
| return new byte[0]; |
| } |
| |
| // Obtain the relevant data in a temporary array. |
| int totalSize = 0; |
| int backedUpSettingIndex = 0; |
| Map<String, String> cachedEntries = new HashMap<String, String>(); |
| for (int i = 0; i < settingsCount; i++) { |
| String key = settings[i]; |
| String value = cachedEntries.remove(key); |
| |
| // If the value not cached, let us look it up. |
| if (value == null) { |
| while (!cursor.isAfterLast()) { |
| String cursorKey = cursor.getString(COLUMN_NAME); |
| String cursorValue = cursor.getString(COLUMN_VALUE); |
| cursor.moveToNext(); |
| if (key.equals(cursorKey)) { |
| value = cursorValue; |
| break; |
| } |
| cachedEntries.put(cursorKey, cursorValue); |
| } |
| } |
| |
| if (value == null) { |
| continue; |
| } |
| |
| // Write the key and value in the intermediary array. |
| byte[] keyBytes = key.getBytes(); |
| totalSize += INTEGER_BYTE_COUNT + keyBytes.length; |
| values[backedUpSettingIndex * 2] = keyBytes; |
| |
| byte[] valueBytes = value.getBytes(); |
| 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++) { |
| pos = writeInt(result, pos, values[i].length); |
| pos = writeBytes(result, pos, values[i]); |
| } |
| return result; |
| } |
| |
| private byte[] getFileData(String filename) { |
| InputStream is = null; |
| try { |
| File file = new File(filename); |
| is = new FileInputStream(file); |
| |
| //Will truncate read on a very long file, |
| //should not happen for a config file |
| byte[] bytes = new byte[(int)file.length()]; |
| |
| int offset = 0; |
| int numRead = 0; |
| while (offset < bytes.length |
| && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) { |
| offset += numRead; |
| } |
| |
| //read failure |
| if (offset < bytes.length) { |
| Log.w(TAG, "Couldn't backup " + filename); |
| return EMPTY_DATA; |
| } |
| return bytes; |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't backup " + filename); |
| return EMPTY_DATA; |
| } finally { |
| if (is != null) { |
| try { |
| is.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| |
| } |
| |
| private void restoreFileData(String filename, byte[] bytes, int size) { |
| try { |
| File file = new File(filename); |
| if (file.exists()) file.delete(); |
| |
| OutputStream os = new BufferedOutputStream(new FileOutputStream(filename, true)); |
| os.write(bytes, 0, size); |
| os.close(); |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't restore " + filename); |
| } |
| } |
| |
| |
| private byte[] getWifiSupplicant(String filename) { |
| BufferedReader br = null; |
| try { |
| File file = new File(filename); |
| if (file.exists()) { |
| br = new BufferedReader(new FileReader(file)); |
| StringBuffer relevantLines = new StringBuffer(); |
| boolean started = false; |
| String line; |
| while ((line = br.readLine()) != null) { |
| if (!started && line.startsWith("network")) { |
| started = true; |
| } |
| if (started) { |
| relevantLines.append(line).append("\n"); |
| } |
| } |
| if (relevantLines.length() > 0) { |
| return relevantLines.toString().getBytes(); |
| } else { |
| return EMPTY_DATA; |
| } |
| } else { |
| return EMPTY_DATA; |
| } |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't backup " + filename); |
| return EMPTY_DATA; |
| } finally { |
| if (br != null) { |
| try { |
| br.close(); |
| } catch (IOException e) { |
| } |
| } |
| } |
| } |
| |
| private void restoreWifiSupplicant(String filename, byte[] bytes, int size) { |
| try { |
| WifiNetworkSettings supplicantImage = new WifiNetworkSettings(); |
| |
| File supplicantFile = new File(FILE_WIFI_SUPPLICANT); |
| if (supplicantFile.exists()) { |
| // Retain the existing APs; we'll append the restored ones to them |
| BufferedReader in = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT)); |
| supplicantImage.readNetworks(in); |
| in.close(); |
| |
| supplicantFile.delete(); |
| } |
| |
| // Incorporate the restore AP information |
| if (size > 0) { |
| char[] restoredAsBytes = new char[size]; |
| for (int i = 0; i < size; i++) restoredAsBytes[i] = (char) bytes[i]; |
| BufferedReader in = new BufferedReader(new CharArrayReader(restoredAsBytes)); |
| supplicantImage.readNetworks(in); |
| |
| if (DEBUG_BACKUP) { |
| Log.v(TAG, "Final AP list:"); |
| supplicantImage.dump(); |
| } |
| } |
| |
| // Install the correct default template |
| BufferedWriter bw = new BufferedWriter(new FileWriter(FILE_WIFI_SUPPLICANT)); |
| copyWifiSupplicantTemplate(bw); |
| |
| // Write the restored supplicant config and we're done |
| supplicantImage.write(bw); |
| bw.close(); |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't restore " + filename); |
| } |
| } |
| |
| private void copyWifiSupplicantTemplate(BufferedWriter bw) { |
| try { |
| BufferedReader br = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT_TEMPLATE)); |
| char[] temp = new char[1024]; |
| int size; |
| while ((size = br.read(temp)) > 0) { |
| bw.write(temp, 0, size); |
| } |
| br.close(); |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't copy wpa_supplicant file"); |
| } |
| } |
| |
| /** |
| * 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 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 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, 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; |
| } |
| |
| private int enableWifi(boolean enable) { |
| if (mWfm == null) { |
| mWfm = (WifiManager) getSystemService(Context.WIFI_SERVICE); |
| } |
| if (mWfm != null) { |
| int state = mWfm.getWifiState(); |
| mWfm.setWifiEnabled(enable); |
| return state; |
| } else { |
| Log.e(TAG, "Failed to fetch WifiManager instance"); |
| } |
| return WifiManager.WIFI_STATE_UNKNOWN; |
| } |
| } |
