| /* |
| * 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 java.io.BufferedReader; |
| import java.io.BufferedWriter; |
| 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.util.Arrays; |
| import java.util.zip.CRC32; |
| |
| import android.backup.BackupDataInput; |
| import android.backup.BackupDataOutput; |
| import android.backup.BackupHelperAgent; |
| 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.ParcelFileDescriptor; |
| import android.os.Process; |
| import android.provider.Settings; |
| import android.text.TextUtils; |
| import android.util.Log; |
| |
| /** |
| * 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 BackupHelperAgent { |
| // STOPSHIP: set DEBUG to false |
| private static final boolean DEBUG = true; |
| |
| private static final String KEY_SYSTEM = "system"; |
| private static final String KEY_SECURE = "secure"; |
| 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 = 1; |
| |
| 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 = 3; |
| private static final int STATE_SIZE = 4; // The number of state items |
| |
| private static String[] sortedSystemKeys = null; |
| private static String[] sortedSecureKeys = null; |
| |
| 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 SettingsHelper mSettingsHelper; |
| |
| public void onCreate() { |
| mSettingsHelper = new SettingsHelper(this); |
| super.onCreate(); |
| } |
| |
| @Override |
| public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, |
| ParcelFileDescriptor newState) throws IOException { |
| |
| byte[] systemSettingsData = getSystemSettings(); |
| byte[] secureSettingsData = getSecureSettings(); |
| byte[] locale = mSettingsHelper.getLocaleData(); |
| byte[] wifiData = getWifiSupplicant(FILE_WIFI_SUPPLICANT); |
| |
| 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_LOCALE] = |
| writeIfChanged(stateChecksums[STATE_LOCALE], KEY_LOCALE, locale, data); |
| stateChecksums[STATE_WIFI] = |
| writeIfChanged(stateChecksums[STATE_WIFI], KEY_WIFI_SUPPLICANT, wifiData, data); |
| |
| writeNewChecksums(stateChecksums, newState); |
| } |
| |
| @Override |
| public void onRestore(BackupDataInput data, int appVersionCode, |
| ParcelFileDescriptor newState) throws IOException { |
| |
| while (data.readNextHeader()) { |
| final String key = data.getKey(); |
| final int size = data.getDataSize(); |
| if (KEY_SYSTEM.equals(key)) { |
| restoreSettings(data, Settings.System.CONTENT_URI); |
| mSettingsHelper.applyAudioSettings(); |
| } else if (KEY_SECURE.equals(key)) { |
| restoreSettings(data, Settings.Secure.CONTENT_URI); |
| } else if (KEY_WIFI_SUPPLICANT.equals(key)) { |
| int retainedWifiState = enableWifi(false); |
| restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, data); |
| 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); |
| } else if (KEY_LOCALE.equals(key)) { |
| byte[] localeData = new byte[size]; |
| data.readEntityData(localeData, 0, size); |
| mSettingsHelper.setLocaleData(localeData); |
| } else { |
| data.skipEntityData(); |
| } |
| } |
| } |
| |
| 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) { |
| for (int i = 0; i < STATE_SIZE; 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 sortedCursor = getContentResolver().query(Settings.System.CONTENT_URI, PROJECTION, |
| null, null, Settings.NameValueTable.NAME); |
| // Copy and sort the array |
| if (sortedSystemKeys == null) { |
| sortedSystemKeys = copyAndSort(Settings.System.SETTINGS_TO_BACKUP); |
| } |
| byte[] result = extractRelevantValues(sortedCursor, sortedSystemKeys); |
| sortedCursor.close(); |
| return result; |
| } |
| |
| private byte[] getSecureSettings() { |
| Cursor sortedCursor = getContentResolver().query(Settings.Secure.CONTENT_URI, PROJECTION, |
| null, null, Settings.NameValueTable.NAME); |
| // Copy and sort the array |
| if (sortedSecureKeys == null) { |
| sortedSecureKeys = copyAndSort(Settings.Secure.SETTINGS_TO_BACKUP); |
| } |
| byte[] result = extractRelevantValues(sortedCursor, sortedSecureKeys); |
| sortedCursor.close(); |
| return result; |
| } |
| |
| private void restoreSettings(BackupDataInput data, Uri contentUri) { |
| if (DEBUG) Log.i(TAG, "restoreSettings: " + contentUri); |
| 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; |
| } |
| |
| ContentValues cv = new ContentValues(2); |
| 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; |
| } |
| int pos = 0; |
| while (pos < settings.length) { |
| int length = readInt(settings, pos); |
| pos += 4; |
| String settingName = length > 0? new String(settings, pos, length) : null; |
| pos += length; |
| length = readInt(settings, pos); |
| pos += 4; |
| String settingValue = length > 0? new String(settings, pos, length) : null; |
| pos += length; |
| if (!TextUtils.isEmpty(settingName) && !TextUtils.isEmpty(settingValue)) { |
| //Log.i(TAG, "Restore " + settingName + " = " + settingValue); |
| |
| // Only restore settings in our list of known-acceptable data |
| if (invalidSavedSetting(whitelist, settingName)) { |
| continue; |
| } |
| |
| if (mSettingsHelper.restoreValue(settingName, settingValue)) { |
| cv.clear(); |
| cv.put(Settings.NameValueTable.NAME, settingName); |
| cv.put(Settings.NameValueTable.VALUE, settingValue); |
| getContentResolver().insert(contentUri, cv); |
| } |
| } |
| } |
| } |
| |
| // Returns 'true' if the given setting is one that we refuse to restore |
| private boolean invalidSavedSetting(String[] knownNames, String candidate) { |
| // no filter? allow everything |
| if (knownNames == null) { |
| return false; |
| } |
| |
| // whitelisted setting? allow it |
| for (String name : knownNames) { |
| if (name.equals(candidate)) { |
| return false; |
| } |
| } |
| |
| // refuse everything else |
| if (DEBUG) Log.v(TAG, "Ignoring restore datum: " + candidate); |
| return true; |
| } |
| |
| private String[] copyAndSort(String[] keys) { |
| String[] sortedKeys = new String[keys.length]; |
| System.arraycopy(keys, 0, sortedKeys, 0, keys.length); |
| Arrays.sort(sortedKeys); |
| return sortedKeys; |
| } |
| |
| /** |
| * Given a cursor sorted by key name and a set of keys sorted by name, |
| * extract the required keys and values and write them to a byte array. |
| * @param sortedCursor |
| * @param sortedKeys |
| * @return |
| */ |
| byte[] extractRelevantValues(Cursor sortedCursor, String[] sortedKeys) { |
| byte[][] values = new byte[sortedKeys.length * 2][]; // keys and values |
| if (!sortedCursor.moveToFirst()) { |
| Log.e(TAG, "Couldn't read from the cursor"); |
| return new byte[0]; |
| } |
| int keyIndex = 0; |
| int totalSize = 0; |
| while (!sortedCursor.isAfterLast()) { |
| String name = sortedCursor.getString(COLUMN_NAME); |
| while (sortedKeys[keyIndex].compareTo(name.toString()) < 0) { |
| keyIndex++; |
| if (keyIndex == sortedKeys.length) break; |
| } |
| if (keyIndex < sortedKeys.length && name.equals(sortedKeys[keyIndex])) { |
| String value = sortedCursor.getString(COLUMN_VALUE); |
| byte[] nameBytes = name.toString().getBytes(); |
| totalSize += 4 + nameBytes.length; |
| values[keyIndex * 2] = nameBytes; |
| byte[] valueBytes; |
| if (TextUtils.isEmpty(value)) { |
| valueBytes = null; |
| totalSize += 4; |
| } else { |
| valueBytes = value.toString().getBytes(); |
| totalSize += 4 + valueBytes.length; |
| //Log.i(TAG, "Backing up " + name + " = " + value); |
| } |
| values[keyIndex * 2 + 1] = valueBytes; |
| keyIndex++; |
| } |
| if (keyIndex == sortedKeys.length || !sortedCursor.moveToNext()) { |
| break; |
| } |
| } |
| |
| byte[] result = new byte[totalSize]; |
| int pos = 0; |
| for (int i = 0; i < sortedKeys.length * 2; i++) { |
| if (values[i] != null) { |
| pos = writeInt(result, pos, values[i].length); |
| pos = writeBytes(result, pos, values[i]); |
| } |
| } |
| return result; |
| } |
| |
| private byte[] getWifiSupplicant(String filename) { |
| try { |
| File file = new File(filename); |
| if (file.exists()) { |
| BufferedReader 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; |
| } |
| } |
| |
| private void restoreWifiSupplicant(String filename, BackupDataInput data) { |
| byte[] bytes = new byte[data.getDataSize()]; |
| if (bytes.length <= 0) return; |
| try { |
| data.readEntityData(bytes, 0, bytes.length); |
| File supplicantFile = new File(FILE_WIFI_SUPPLICANT); |
| if (supplicantFile.exists()) supplicantFile.delete(); |
| copyWifiSupplicantTemplate(); |
| |
| FileOutputStream fos = new FileOutputStream(filename, true); |
| fos.write("\n".getBytes()); |
| fos.write(bytes); |
| } catch (IOException ioe) { |
| Log.w(TAG, "Couldn't restore " + filename); |
| } |
| } |
| |
| private void copyWifiSupplicantTemplate() { |
| try { |
| BufferedReader br = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT_TEMPLATE)); |
| BufferedWriter bw = new BufferedWriter(new FileWriter(FILE_WIFI_SUPPLICANT)); |
| char[] temp = new char[1024]; |
| int size; |
| while ((size = br.read(temp)) > 0) { |
| bw.write(temp, 0, size); |
| } |
| bw.close(); |
| 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) |
| */ |
| 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 + 4; |
| } |
| |
| 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) { |
| WifiManager wfm = (WifiManager) getSystemService(Context.WIFI_SERVICE); |
| if (wfm != null) { |
| int state = wfm.getWifiState(); |
| wfm.setWifiEnabled(enable); |
| return state; |
| } |
| return WifiManager.WIFI_STATE_UNKNOWN; |
| } |
| } |