SettingsBackupAgent.java revision 2efd2dbbac9eac89620683696c6076463c3a1cd6
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.providers.settings; 18 19import java.io.BufferedOutputStream; 20import java.io.BufferedReader; 21import java.io.BufferedWriter; 22import java.io.DataInputStream; 23import java.io.DataOutputStream; 24import java.io.EOFException; 25import java.io.File; 26import java.io.FileInputStream; 27import java.io.FileOutputStream; 28import java.io.FileReader; 29import java.io.FileWriter; 30import java.io.InputStream; 31import java.io.IOException; 32import java.io.OutputStream; 33import java.util.Arrays; 34import java.util.zip.CRC32; 35 36import android.app.backup.BackupDataInput; 37import android.app.backup.BackupDataOutput; 38import android.app.backup.BackupAgentHelper; 39import android.app.backup.FullBackupDataOutput; 40import android.content.ContentValues; 41import android.content.Context; 42import android.database.Cursor; 43import android.net.Uri; 44import android.net.wifi.WifiManager; 45import android.os.FileUtils; 46import android.os.ParcelFileDescriptor; 47import android.os.Process; 48import android.provider.Settings; 49import android.text.TextUtils; 50import android.util.Log; 51 52/** 53 * Performs backup and restore of the System and Secure settings. 54 * List of settings that are backed up are stored in the Settings.java file 55 */ 56public class SettingsBackupAgent extends BackupAgentHelper { 57 private static final boolean DEBUG = false; 58 private static final boolean DEBUG_BACKUP = DEBUG || true; 59 60 private static final String KEY_SYSTEM = "system"; 61 private static final String KEY_SECURE = "secure"; 62 private static final String KEY_LOCALE = "locale"; 63 64 //Version 2 adds STATE_WIFI_CONFIG 65 private static final int STATE_VERSION_1 = 1; 66 private static final int STATE_VERSION_1_SIZE = 4; 67 68 // Versioning of the state file. Increment this version 69 // number any time the set of state items is altered. 70 private static final int STATE_VERSION = 2; 71 72 private static final int STATE_SYSTEM = 0; 73 private static final int STATE_SECURE = 1; 74 private static final int STATE_LOCALE = 2; 75 private static final int STATE_WIFI_SUPPLICANT = 3; 76 private static final int STATE_WIFI_CONFIG = 4; 77 private static final int STATE_SIZE = 5; // The number of state items 78 79 // Versioning of the 'full backup' format 80 private static final int FULL_BACKUP_VERSION = 1; 81 82 private static String[] sortedSystemKeys = null; 83 private static String[] sortedSecureKeys = null; 84 85 private static final byte[] EMPTY_DATA = new byte[0]; 86 87 private static final String TAG = "SettingsBackupAgent"; 88 89 private static final int COLUMN_NAME = 1; 90 private static final int COLUMN_VALUE = 2; 91 92 private static final String[] PROJECTION = { 93 Settings.NameValueTable._ID, 94 Settings.NameValueTable.NAME, 95 Settings.NameValueTable.VALUE 96 }; 97 98 private static final String FILE_WIFI_SUPPLICANT = "/data/misc/wifi/wpa_supplicant.conf"; 99 private static final String FILE_WIFI_SUPPLICANT_TEMPLATE = 100 "/system/etc/wifi/wpa_supplicant.conf"; 101 102 // the key to store the WIFI data under, should be sorted as last, so restore happens last. 103 // use very late unicode character to quasi-guarantee last sort position. 104 private static final String KEY_WIFI_SUPPLICANT = "\uffedWIFI"; 105 private static final String KEY_WIFI_CONFIG = "\uffedCONFIG_WIFI"; 106 107 // Name of the temporary file we use during full backup/restore. This is 108 // stored in the full-backup tarfile as well, so should not be changed. 109 private static final String STAGE_FILE = "flattened-data"; 110 111 private SettingsHelper mSettingsHelper; 112 private WifiManager mWfm; 113 private static String mWifiConfigFile; 114 115 public void onCreate() { 116 if (DEBUG_BACKUP) Log.d(TAG, "onCreate() invoked"); 117 118 mSettingsHelper = new SettingsHelper(this); 119 super.onCreate(); 120 121 WifiManager mWfm = (WifiManager) getSystemService(Context.WIFI_SERVICE); 122 if (mWfm != null) mWifiConfigFile = mWfm.getConfigFile(); 123 } 124 125 @Override 126 public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data, 127 ParcelFileDescriptor newState) throws IOException { 128 129 byte[] systemSettingsData = getSystemSettings(); 130 byte[] secureSettingsData = getSecureSettings(); 131 byte[] locale = mSettingsHelper.getLocaleData(); 132 byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT); 133 byte[] wifiConfigData = getFileData(mWifiConfigFile); 134 135 long[] stateChecksums = readOldChecksums(oldState); 136 137 stateChecksums[STATE_SYSTEM] = 138 writeIfChanged(stateChecksums[STATE_SYSTEM], KEY_SYSTEM, systemSettingsData, data); 139 stateChecksums[STATE_SECURE] = 140 writeIfChanged(stateChecksums[STATE_SECURE], KEY_SECURE, secureSettingsData, data); 141 stateChecksums[STATE_LOCALE] = 142 writeIfChanged(stateChecksums[STATE_LOCALE], KEY_LOCALE, locale, data); 143 stateChecksums[STATE_WIFI_SUPPLICANT] = 144 writeIfChanged(stateChecksums[STATE_WIFI_SUPPLICANT], KEY_WIFI_SUPPLICANT, 145 wifiSupplicantData, data); 146 stateChecksums[STATE_WIFI_CONFIG] = 147 writeIfChanged(stateChecksums[STATE_WIFI_CONFIG], KEY_WIFI_CONFIG, wifiConfigData, 148 data); 149 150 writeNewChecksums(stateChecksums, newState); 151 } 152 153 @Override 154 public void onRestore(BackupDataInput data, int appVersionCode, 155 ParcelFileDescriptor newState) throws IOException { 156 157 while (data.readNextHeader()) { 158 final String key = data.getKey(); 159 final int size = data.getDataSize(); 160 if (KEY_SYSTEM.equals(key)) { 161 restoreSettings(data, Settings.System.CONTENT_URI); 162 mSettingsHelper.applyAudioSettings(); 163 } else if (KEY_SECURE.equals(key)) { 164 restoreSettings(data, Settings.Secure.CONTENT_URI); 165 } else if (KEY_WIFI_SUPPLICANT.equals(key)) { 166 int retainedWifiState = enableWifi(false); 167 restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, data); 168 FileUtils.setPermissions(FILE_WIFI_SUPPLICANT, 169 FileUtils.S_IRUSR | FileUtils.S_IWUSR | 170 FileUtils.S_IRGRP | FileUtils.S_IWGRP, 171 Process.myUid(), Process.WIFI_UID); 172 // retain the previous WIFI state. 173 enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED || 174 retainedWifiState == WifiManager.WIFI_STATE_ENABLING); 175 } else if (KEY_LOCALE.equals(key)) { 176 byte[] localeData = new byte[size]; 177 data.readEntityData(localeData, 0, size); 178 mSettingsHelper.setLocaleData(localeData, size); 179 } else if (KEY_WIFI_CONFIG.equals(key)) { 180 restoreFileData(mWifiConfigFile, data); 181 } else { 182 data.skipEntityData(); 183 } 184 } 185 } 186 187 @Override 188 public void onFullBackup(FullBackupDataOutput data) throws IOException { 189 byte[] systemSettingsData = getSystemSettings(); 190 byte[] secureSettingsData = getSecureSettings(); 191 byte[] locale = mSettingsHelper.getLocaleData(); 192 byte[] wifiSupplicantData = getWifiSupplicant(FILE_WIFI_SUPPLICANT); 193 byte[] wifiConfigData = getFileData(mWifiConfigFile); 194 195 // Write the data to the staging file, then emit that as our tarfile 196 // representation of the backed-up settings. 197 String root = getFilesDir().getAbsolutePath(); 198 File stage = new File(root, STAGE_FILE); 199 try { 200 FileOutputStream filestream = new FileOutputStream(stage); 201 BufferedOutputStream bufstream = new BufferedOutputStream(filestream); 202 DataOutputStream out = new DataOutputStream(bufstream); 203 204 if (DEBUG_BACKUP) Log.d(TAG, "Writing flattened data version " + FULL_BACKUP_VERSION); 205 out.writeInt(FULL_BACKUP_VERSION); 206 207 if (DEBUG_BACKUP) Log.d(TAG, systemSettingsData.length + " bytes of settings data"); 208 out.writeInt(systemSettingsData.length); 209 out.write(systemSettingsData); 210 if (DEBUG_BACKUP) Log.d(TAG, secureSettingsData.length + " bytes of secure settings data"); 211 out.writeInt(secureSettingsData.length); 212 out.write(secureSettingsData); 213 if (DEBUG_BACKUP) Log.d(TAG, locale.length + " bytes of locale data"); 214 out.writeInt(locale.length); 215 out.write(locale); 216 if (DEBUG_BACKUP) Log.d(TAG, wifiSupplicantData.length + " bytes of wifi supplicant data"); 217 out.writeInt(wifiSupplicantData.length); 218 out.write(wifiSupplicantData); 219 if (DEBUG_BACKUP) Log.d(TAG, wifiConfigData.length + " bytes of wifi config data"); 220 out.writeInt(wifiConfigData.length); 221 out.write(wifiConfigData); 222 223 out.flush(); // also flushes downstream 224 225 // now we're set to emit the tar stream 226 fullBackupFile(stage, data); 227 } finally { 228 stage.delete(); 229 } 230 } 231 232 @Override 233 public void onRestoreFile(ParcelFileDescriptor data, long size, 234 int type, String domain, String relpath, long mode, long mtime) 235 throws IOException { 236 if (DEBUG_BACKUP) Log.d(TAG, "onRestoreFile() invoked"); 237 // Our data is actually a blob of flattened settings data identical to that 238 // produced during incremental backups. Just unpack and apply it all in 239 // turn. 240 FileInputStream instream = new FileInputStream(data.getFileDescriptor()); 241 DataInputStream in = new DataInputStream(instream); 242 243 int version = in.readInt(); 244 if (DEBUG_BACKUP) Log.d(TAG, "Flattened data version " + version); 245 if (version == FULL_BACKUP_VERSION) { 246 // system settings data first 247 int nBytes = in.readInt(); 248 if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of settings data"); 249 byte[] buffer = new byte[nBytes]; 250 in.readFully(buffer, 0, nBytes); 251 restoreSettings(buffer, nBytes, Settings.System.CONTENT_URI); 252 253 // secure settings 254 nBytes = in.readInt(); 255 if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of secure settings data"); 256 if (nBytes > buffer.length) buffer = new byte[nBytes]; 257 in.readFully(buffer, 0, nBytes); 258 restoreSettings(buffer, nBytes, Settings.Secure.CONTENT_URI); 259 260 // locale 261 nBytes = in.readInt(); 262 if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of locale data"); 263 if (nBytes > buffer.length) buffer = new byte[nBytes]; 264 in.readFully(buffer, 0, nBytes); 265 mSettingsHelper.setLocaleData(buffer, nBytes); 266 267 // wifi supplicant 268 nBytes = in.readInt(); 269 if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi supplicant data"); 270 if (nBytes > buffer.length) buffer = new byte[nBytes]; 271 in.readFully(buffer, 0, nBytes); 272 int retainedWifiState = enableWifi(false); 273 restoreWifiSupplicant(FILE_WIFI_SUPPLICANT, buffer, nBytes); 274 FileUtils.setPermissions(FILE_WIFI_SUPPLICANT, 275 FileUtils.S_IRUSR | FileUtils.S_IWUSR | 276 FileUtils.S_IRGRP | FileUtils.S_IWGRP, 277 Process.myUid(), Process.WIFI_UID); 278 // retain the previous WIFI state. 279 enableWifi(retainedWifiState == WifiManager.WIFI_STATE_ENABLED || 280 retainedWifiState == WifiManager.WIFI_STATE_ENABLING); 281 282 // wifi config 283 nBytes = in.readInt(); 284 if (DEBUG_BACKUP) Log.d(TAG, nBytes + " bytes of wifi config data"); 285 if (nBytes > buffer.length) buffer = new byte[nBytes]; 286 in.readFully(buffer, 0, nBytes); 287 restoreFileData(mWifiConfigFile, buffer, nBytes); 288 289 if (DEBUG_BACKUP) Log.d(TAG, "Full restore complete."); 290 } else { 291 data.close(); 292 throw new IOException("Invalid file schema"); 293 } 294 } 295 296 private long[] readOldChecksums(ParcelFileDescriptor oldState) throws IOException { 297 long[] stateChecksums = new long[STATE_SIZE]; 298 299 DataInputStream dataInput = new DataInputStream( 300 new FileInputStream(oldState.getFileDescriptor())); 301 302 try { 303 int stateVersion = dataInput.readInt(); 304 if (stateVersion == STATE_VERSION_1) { 305 for (int i = 0; i < STATE_VERSION_1_SIZE; i++) { 306 stateChecksums[i] = dataInput.readLong(); 307 } 308 } else if (stateVersion == STATE_VERSION) { 309 for (int i = 0; i < STATE_SIZE; i++) { 310 stateChecksums[i] = dataInput.readLong(); 311 } 312 } 313 } catch (EOFException eof) { 314 // With the default 0 checksum we'll wind up forcing a backup of 315 // any unhandled data sets, which is appropriate. 316 } 317 dataInput.close(); 318 return stateChecksums; 319 } 320 321 private void writeNewChecksums(long[] checksums, ParcelFileDescriptor newState) 322 throws IOException { 323 DataOutputStream dataOutput = new DataOutputStream( 324 new FileOutputStream(newState.getFileDescriptor())); 325 326 dataOutput.writeInt(STATE_VERSION); 327 for (int i = 0; i < STATE_SIZE; i++) { 328 dataOutput.writeLong(checksums[i]); 329 } 330 dataOutput.close(); 331 } 332 333 private long writeIfChanged(long oldChecksum, String key, byte[] data, 334 BackupDataOutput output) { 335 CRC32 checkSummer = new CRC32(); 336 checkSummer.update(data); 337 long newChecksum = checkSummer.getValue(); 338 if (oldChecksum == newChecksum) { 339 return oldChecksum; 340 } 341 try { 342 output.writeEntityHeader(key, data.length); 343 output.writeEntityData(data, data.length); 344 } catch (IOException ioe) { 345 // Bail 346 } 347 return newChecksum; 348 } 349 350 private byte[] getSystemSettings() { 351 Cursor sortedCursor = getContentResolver().query(Settings.System.CONTENT_URI, PROJECTION, 352 null, null, Settings.NameValueTable.NAME); 353 // Copy and sort the array 354 if (sortedSystemKeys == null) { 355 sortedSystemKeys = copyAndSort(Settings.System.SETTINGS_TO_BACKUP); 356 } 357 byte[] result = extractRelevantValues(sortedCursor, sortedSystemKeys); 358 sortedCursor.close(); 359 return result; 360 } 361 362 private byte[] getSecureSettings() { 363 Cursor sortedCursor = getContentResolver().query(Settings.Secure.CONTENT_URI, PROJECTION, 364 null, null, Settings.NameValueTable.NAME); 365 // Copy and sort the array 366 if (sortedSecureKeys == null) { 367 sortedSecureKeys = copyAndSort(Settings.Secure.SETTINGS_TO_BACKUP); 368 } 369 byte[] result = extractRelevantValues(sortedCursor, sortedSecureKeys); 370 sortedCursor.close(); 371 return result; 372 } 373 374 private void restoreSettings(BackupDataInput data, Uri contentUri) { 375 byte[] settings = new byte[data.getDataSize()]; 376 try { 377 data.readEntityData(settings, 0, settings.length); 378 } catch (IOException ioe) { 379 Log.e(TAG, "Couldn't read entity data"); 380 return; 381 } 382 restoreSettings(settings, settings.length, contentUri); 383 } 384 385 private void restoreSettings(byte[] settings, int bytes, Uri contentUri) { 386 if (DEBUG) Log.i(TAG, "restoreSettings: " + contentUri); 387 String[] whitelist = null; 388 if (contentUri.equals(Settings.Secure.CONTENT_URI)) { 389 whitelist = Settings.Secure.SETTINGS_TO_BACKUP; 390 } else if (contentUri.equals(Settings.System.CONTENT_URI)) { 391 whitelist = Settings.System.SETTINGS_TO_BACKUP; 392 } 393 394 ContentValues cv = new ContentValues(2); 395 int pos = 0; 396 while (pos < bytes) { 397 int length = readInt(settings, pos); 398 pos += 4; 399 String settingName = length > 0? new String(settings, pos, length) : null; 400 pos += length; 401 length = readInt(settings, pos); 402 pos += 4; 403 String settingValue = length > 0? new String(settings, pos, length) : null; 404 pos += length; 405 if (!TextUtils.isEmpty(settingName) && !TextUtils.isEmpty(settingValue)) { 406 //Log.i(TAG, "Restore " + settingName + " = " + settingValue); 407 408 // Only restore settings in our list of known-acceptable data 409 if (invalidSavedSetting(whitelist, settingName)) { 410 continue; 411 } 412 413 if (mSettingsHelper.restoreValue(settingName, settingValue)) { 414 cv.clear(); 415 cv.put(Settings.NameValueTable.NAME, settingName); 416 cv.put(Settings.NameValueTable.VALUE, settingValue); 417 getContentResolver().insert(contentUri, cv); 418 } 419 } 420 } 421 } 422 423 // Returns 'true' if the given setting is one that we refuse to restore 424 private boolean invalidSavedSetting(String[] knownNames, String candidate) { 425 // no filter? allow everything 426 if (knownNames == null) { 427 return false; 428 } 429 430 // whitelisted setting? allow it 431 for (String name : knownNames) { 432 if (name.equals(candidate)) { 433 return false; 434 } 435 } 436 437 // refuse everything else 438 if (DEBUG) Log.v(TAG, "Ignoring restore datum: " + candidate); 439 return true; 440 } 441 442 private String[] copyAndSort(String[] keys) { 443 String[] sortedKeys = new String[keys.length]; 444 System.arraycopy(keys, 0, sortedKeys, 0, keys.length); 445 Arrays.sort(sortedKeys); 446 return sortedKeys; 447 } 448 449 /** 450 * Given a cursor sorted by key name and a set of keys sorted by name, 451 * extract the required keys and values and write them to a byte array. 452 * @param sortedCursor 453 * @param sortedKeys 454 * @return 455 */ 456 byte[] extractRelevantValues(Cursor sortedCursor, String[] sortedKeys) { 457 byte[][] values = new byte[sortedKeys.length * 2][]; // keys and values 458 if (!sortedCursor.moveToFirst()) { 459 Log.e(TAG, "Couldn't read from the cursor"); 460 return new byte[0]; 461 } 462 int keyIndex = 0; 463 int totalSize = 0; 464 while (!sortedCursor.isAfterLast()) { 465 String name = sortedCursor.getString(COLUMN_NAME); 466 while (sortedKeys[keyIndex].compareTo(name.toString()) < 0) { 467 keyIndex++; 468 if (keyIndex == sortedKeys.length) break; 469 } 470 if (keyIndex < sortedKeys.length && name.equals(sortedKeys[keyIndex])) { 471 String value = sortedCursor.getString(COLUMN_VALUE); 472 byte[] nameBytes = name.toString().getBytes(); 473 totalSize += 4 + nameBytes.length; 474 values[keyIndex * 2] = nameBytes; 475 byte[] valueBytes; 476 if (TextUtils.isEmpty(value)) { 477 valueBytes = null; 478 totalSize += 4; 479 } else { 480 valueBytes = value.toString().getBytes(); 481 totalSize += 4 + valueBytes.length; 482 //Log.i(TAG, "Backing up " + name + " = " + value); 483 } 484 values[keyIndex * 2 + 1] = valueBytes; 485 keyIndex++; 486 } 487 if (keyIndex == sortedKeys.length || !sortedCursor.moveToNext()) { 488 break; 489 } 490 } 491 492 byte[] result = new byte[totalSize]; 493 int pos = 0; 494 for (int i = 0; i < sortedKeys.length * 2; i++) { 495 if (values[i] != null) { 496 pos = writeInt(result, pos, values[i].length); 497 pos = writeBytes(result, pos, values[i]); 498 } 499 } 500 return result; 501 } 502 503 private byte[] getFileData(String filename) { 504 InputStream is = null; 505 try { 506 File file = new File(filename); 507 is = new FileInputStream(file); 508 509 //Will truncate read on a very long file, 510 //should not happen for a config file 511 byte[] bytes = new byte[(int)file.length()]; 512 513 int offset = 0; 514 int numRead = 0; 515 while (offset < bytes.length 516 && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) { 517 offset += numRead; 518 } 519 520 //read failure 521 if (offset < bytes.length) { 522 Log.w(TAG, "Couldn't backup " + filename); 523 return EMPTY_DATA; 524 } 525 return bytes; 526 } catch (IOException ioe) { 527 Log.w(TAG, "Couldn't backup " + filename); 528 return EMPTY_DATA; 529 } finally { 530 if (is != null) { 531 try { 532 is.close(); 533 } catch (IOException e) { 534 } 535 } 536 } 537 538 } 539 540 private void restoreFileData(String filename, BackupDataInput data) { 541 byte[] bytes = new byte[data.getDataSize()]; 542 if (bytes.length <= 0) return; 543 try { 544 data.readEntityData(bytes, 0, data.getDataSize()); 545 restoreFileData(filename, bytes, bytes.length); 546 } catch (IOException e) { 547 Log.w(TAG, "Unable to read file data for " + filename); 548 } 549 } 550 551 private void restoreFileData(String filename, byte[] bytes, int size) { 552 try { 553 File file = new File(filename); 554 if (file.exists()) file.delete(); 555 556 OutputStream os = new BufferedOutputStream(new FileOutputStream(filename, true)); 557 os.write(bytes, 0, size); 558 os.close(); 559 } catch (IOException ioe) { 560 Log.w(TAG, "Couldn't restore " + filename); 561 } 562 } 563 564 565 private byte[] getWifiSupplicant(String filename) { 566 BufferedReader br = null; 567 try { 568 File file = new File(filename); 569 if (file.exists()) { 570 br = new BufferedReader(new FileReader(file)); 571 StringBuffer relevantLines = new StringBuffer(); 572 boolean started = false; 573 String line; 574 while ((line = br.readLine()) != null) { 575 if (!started && line.startsWith("network")) { 576 started = true; 577 } 578 if (started) { 579 relevantLines.append(line).append("\n"); 580 } 581 } 582 if (relevantLines.length() > 0) { 583 return relevantLines.toString().getBytes(); 584 } else { 585 return EMPTY_DATA; 586 } 587 } else { 588 return EMPTY_DATA; 589 } 590 } catch (IOException ioe) { 591 Log.w(TAG, "Couldn't backup " + filename); 592 return EMPTY_DATA; 593 } finally { 594 if (br != null) { 595 try { 596 br.close(); 597 } catch (IOException e) { 598 } 599 } 600 } 601 } 602 603 private void restoreWifiSupplicant(String filename, BackupDataInput data) { 604 byte[] bytes = new byte[data.getDataSize()]; 605 if (bytes.length <= 0) return; 606 try { 607 data.readEntityData(bytes, 0, data.getDataSize()); 608 restoreWifiSupplicant(filename, bytes, bytes.length); 609 } catch (IOException e) { 610 Log.w(TAG, "Unable to read supplicant data"); 611 } 612 } 613 614 private void restoreWifiSupplicant(String filename, byte[] bytes, int size) { 615 try { 616 File supplicantFile = new File(FILE_WIFI_SUPPLICANT); 617 if (supplicantFile.exists()) supplicantFile.delete(); 618 copyWifiSupplicantTemplate(); 619 620 OutputStream os = new BufferedOutputStream(new FileOutputStream(filename, true)); 621 os.write("\n".getBytes()); 622 os.write(bytes, 0, size); 623 os.close(); 624 } catch (IOException ioe) { 625 Log.w(TAG, "Couldn't restore " + filename); 626 } 627 } 628 629 private void copyWifiSupplicantTemplate() { 630 try { 631 BufferedReader br = new BufferedReader(new FileReader(FILE_WIFI_SUPPLICANT_TEMPLATE)); 632 BufferedWriter bw = new BufferedWriter(new FileWriter(FILE_WIFI_SUPPLICANT)); 633 char[] temp = new char[1024]; 634 int size; 635 while ((size = br.read(temp)) > 0) { 636 bw.write(temp, 0, size); 637 } 638 bw.close(); 639 br.close(); 640 } catch (IOException ioe) { 641 Log.w(TAG, "Couldn't copy wpa_supplicant file"); 642 } 643 } 644 645 /** 646 * Write an int in BigEndian into the byte array. 647 * @param out byte array 648 * @param pos current pos in array 649 * @param value integer to write 650 * @return the index after adding the size of an int (4) 651 */ 652 private int writeInt(byte[] out, int pos, int value) { 653 out[pos + 0] = (byte) ((value >> 24) & 0xFF); 654 out[pos + 1] = (byte) ((value >> 16) & 0xFF); 655 out[pos + 2] = (byte) ((value >> 8) & 0xFF); 656 out[pos + 3] = (byte) ((value >> 0) & 0xFF); 657 return pos + 4; 658 } 659 660 private int writeBytes(byte[] out, int pos, byte[] value) { 661 System.arraycopy(value, 0, out, pos, value.length); 662 return pos + value.length; 663 } 664 665 private int readInt(byte[] in, int pos) { 666 int result = 667 ((in[pos ] & 0xFF) << 24) | 668 ((in[pos + 1] & 0xFF) << 16) | 669 ((in[pos + 2] & 0xFF) << 8) | 670 ((in[pos + 3] & 0xFF) << 0); 671 return result; 672 } 673 674 private int enableWifi(boolean enable) { 675 if (mWfm != null) { 676 int state = mWfm.getWifiState(); 677 mWfm.setWifiEnabled(enable); 678 return state; 679 } 680 return WifiManager.WIFI_STATE_UNKNOWN; 681 } 682} 683