/*
* Copyright (C) 2010 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 android.os;
import android.annotation.SystemApi;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.UserManager;
import android.text.TextUtils;
import android.util.Log;
import java.io.ByteArrayInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.security.GeneralSecurityException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import com.android.internal.logging.MetricsLogger;
import sun.security.pkcs.PKCS7;
import sun.security.pkcs.SignerInfo;
/**
* RecoverySystem contains methods for interacting with the Android
* recovery system (the separate partition that can be used to install
* system updates, wipe user data, etc.)
*/
public class RecoverySystem {
private static final String TAG = "RecoverySystem";
/**
* Default location of zip file containing public keys (X509
* certs) authorized to sign OTA updates.
*/
private static final File DEFAULT_KEYSTORE =
new File("/system/etc/security/otacerts.zip");
/** Send progress to listeners no more often than this (in ms). */
private static final long PUBLISH_PROGRESS_INTERVAL_MS = 500;
/** Used to communicate with recovery. See bootable/recovery/recovery.cpp. */
private static final File RECOVERY_DIR = new File("/cache/recovery");
private static final File LOG_FILE = new File(RECOVERY_DIR, "log");
private static final File LAST_INSTALL_FILE = new File(RECOVERY_DIR, "last_install");
private static final String LAST_PREFIX = "last_";
/**
* The recovery image uses this file to identify the location (i.e. blocks)
* of an OTA package on the /data partition. The block map file is
* generated by uncrypt.
*
* @hide
*/
public static final File BLOCK_MAP_FILE = new File(RECOVERY_DIR, "block.map");
/**
* UNCRYPT_PACKAGE_FILE stores the filename to be uncrypt'd, which will be
* read by uncrypt.
*
* @hide
*/
public static final File UNCRYPT_PACKAGE_FILE = new File(RECOVERY_DIR, "uncrypt_file");
/**
* UNCRYPT_STATUS_FILE stores the time cost (and error code in the case of a failure)
* of uncrypt.
*
* @hide
*/
public static final File UNCRYPT_STATUS_FILE = new File(RECOVERY_DIR, "uncrypt_status");
// Length limits for reading files.
private static final int LOG_FILE_MAX_LENGTH = 64 * 1024;
// Prevent concurrent execution of requests.
private static final Object sRequestLock = new Object();
private final IRecoverySystem mService;
/**
* Interface definition for a callback to be invoked regularly as
* verification proceeds.
*/
public interface ProgressListener {
/**
* Called periodically as the verification progresses.
*
* @param progress the approximate percentage of the
* verification that has been completed, ranging from 0
* to 100 (inclusive).
*/
public void onProgress(int progress);
}
/** @return the set of certs that can be used to sign an OTA package. */
private static HashSet<X509Certificate> getTrustedCerts(File keystore)
throws IOException, GeneralSecurityException {
HashSet<X509Certificate> trusted = new HashSet<X509Certificate>();
if (keystore == null) {
keystore = DEFAULT_KEYSTORE;
}
ZipFile zip = new ZipFile(keystore);
try {
CertificateFactory cf = CertificateFactory.getInstance("X.509");
Enumeration<? extends ZipEntry> entries = zip.entries();
while (entries.hasMoreElements()) {
ZipEntry entry = entries.nextElement();
InputStream is = zip.getInputStream(entry);
try {
trusted.add((X509Certificate) cf.generateCertificate(is));
} finally {
is.close();
}
}
} finally {
zip.close();
}
return trusted;
}
/**
* Verify the cryptographic signature of a system update package
* before installing it. Note that the package is also verified
* separately by the installer once the device is rebooted into
* the recovery system. This function will return only if the
* package was successfully verified; otherwise it will throw an
* exception.
*
* Verification of a package can take significant time, so this
* function should not be called from a UI thread. Interrupting
* the thread while this function is in progress will result in a
* SecurityException being thrown (and the thread's interrupt flag
* will be cleared).
*
* @param packageFile the package to be verified
* @param listener an object to receive periodic progress
* updates as verification proceeds. May be null.
* @param deviceCertsZipFile the zip file of certificates whose
* public keys we will accept. Verification succeeds if the
* package is signed by the private key corresponding to any
* public key in this file. May be null to use the system default
* file (currently "/system/etc/security/otacerts.zip").
*
* @throws IOException if there were any errors reading the
* package or certs files.
* @throws GeneralSecurityException if verification failed
*/
public static void verifyPackage(File packageFile,
ProgressListener listener,
File deviceCertsZipFile)
throws IOException, GeneralSecurityException {
final long fileLen = packageFile.length();
final RandomAccessFile raf = new RandomAccessFile(packageFile, "r");
try {
final long startTimeMillis = System.currentTimeMillis();
if (listener != null) {
listener.onProgress(0);
}
raf.seek(fileLen - 6);
byte[] footer = new byte[6];
raf.readFully(footer);
if (footer[2] != (byte)0xff || footer[3] != (byte)0xff) {
throw new SignatureException("no signature in file (no footer)");
}
final int commentSize = (footer[4] & 0xff) | ((footer[5] & 0xff) << 8);
final int signatureStart = (footer[0] & 0xff) | ((footer[1] & 0xff) << 8);
byte[] eocd = new byte[commentSize + 22];
raf.seek(fileLen - (commentSize + 22));
raf.readFully(eocd);
// Check that we have found the start of the
// end-of-central-directory record.
if (eocd[0] != (byte)0x50 || eocd[1] != (byte)0x4b ||
eocd[2] != (byte)0x05 || eocd[3] != (byte)0x06) {
throw new SignatureException("no signature in file (bad footer)");
}
for (int i = 4; i < eocd.length-3; ++i) {
if (eocd[i ] == (byte)0x50 && eocd[i+1] == (byte)0x4b &&
eocd[i+2] == (byte)0x05 && eocd[i+3] == (byte)0x06) {
throw new SignatureException("EOCD marker found after start of EOCD");
}
}
// Parse the signature
PKCS7 block =
new PKCS7(new ByteArrayInputStream(eocd, commentSize+22-signatureStart, signatureStart));
// Take the first certificate from the signature (packages
// should contain only one).
X509Certificate[] certificates = block.getCertificates();
if (certificates == null || certificates.length == 0) {
throw new SignatureException("signature contains no certificates");
}
X509Certificate cert = certificates[0];
PublicKey signatureKey = cert.getPublicKey();
SignerInfo[] signerInfos = block.getSignerInfos();
if (signerInfos == null || signerInfos.length == 0) {
throw new SignatureException("signature contains no signedData");
}
SignerInfo signerInfo = signerInfos[0];
// Check that the public key of the certificate contained
// in the package equals one of our trusted public keys.
boolean verified = false;
HashSet<X509Certificate> trusted = getTrustedCerts(
deviceCertsZipFile == null ? DEFAULT_KEYSTORE : deviceCertsZipFile);
for (X509Certificate c : trusted) {
if (c.getPublicKey().equals(signatureKey)) {
verified = true;
break;
}
}
if (!verified) {
throw new SignatureException("signature doesn't match any trusted key");
}
// The signature cert matches a trusted key. Now verify that
// the digest in the cert matches the actual file data.
raf.seek(0);
final ProgressListener listenerForInner = listener;
SignerInfo verifyResult = block.verify(signerInfo, new InputStream() {
// The signature covers all of the OTA package except the
// archive comment and its 2-byte length.
long toRead = fileLen - commentSize - 2;
long soFar = 0;
int lastPercent = 0;
long lastPublishTime = startTimeMillis;
@Override
public int read() throws IOException {
throw new UnsupportedOperationException();
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (soFar >= toRead) {
return -1;
}
if (Thread.currentThread().isInterrupted()) {
return -1;
}
int size = len;
if (soFar + size > toRead) {
size = (int)(toRead - soFar);
}
int read = raf.read(b, off, size);
soFar += read;
if (listenerForInner != null) {
long now = System.currentTimeMillis();
int p = (int)(soFar * 100 / toRead);
if (p > lastPercent &&
now - lastPublishTime > PUBLISH_PROGRESS_INTERVAL_MS) {
lastPercent = p;
lastPublishTime = now;
listenerForInner.onProgress(lastPercent);
}
}
return read;
}
});
final boolean interrupted = Thread.interrupted();
if (listener != null) {
listener.onProgress(100);
}
if (interrupted) {
throw new SignatureException("verification was interrupted");
}
if (verifyResult == null) {
throw new SignatureException("signature digest verification failed");
}
} finally {
raf.close();
}
}
/**
* Process a given package with uncrypt. No-op if the package is not on the
* /data partition.
*
* @param Context the Context to use
* @param packageFile the package to be processed
* @param listener an object to receive periodic progress updates as
* processing proceeds. May be null.
* @param handler the Handler upon which the callbacks will be
* executed.
*
* @throws IOException if there were any errors processing the package file.
*
* @hide
*/
@SystemApi
public static void processPackage(Context context,
File packageFile,
final ProgressListener listener,
final Handler handler)
throws IOException {
String filename = packageFile.getCanonicalPath();
if (!filename.startsWith("/data/")) {
return;
}
RecoverySystem rs = (RecoverySystem) context.getSystemService(Context.RECOVERY_SERVICE);
IRecoverySystemProgressListener progressListener = null;
if (listener != null) {
final Handler progressHandler;
if (handler != null) {
progressHandler = handler;
} else {
progressHandler = new Handler(context.getMainLooper());
}
progressListener = new IRecoverySystemProgressListener.Stub() {
int lastProgress = 0;
long lastPublishTime = System.currentTimeMillis();
@Override
public void onProgress(final int progress) {
final long now = System.currentTimeMillis();
progressHandler.post(new Runnable() {
@Override
public void run() {
if (progress > lastProgress &&
now - lastPublishTime > PUBLISH_PROGRESS_INTERVAL_MS) {
lastProgress = progress;
lastPublishTime = now;
listener.onProgress(progress);
}
}
});
}
};
}
if (!rs.uncrypt(filename, progressListener)) {
throw new IOException("process package failed");
}
}
/**
* Process a given package with uncrypt. No-op if the package is not on the
* /data partition.
*
* @param Context the Context to use
* @param packageFile the package to be processed
* @param listener an object to receive periodic progress updates as
* processing proceeds. May be null.
*
* @throws IOException if there were any errors processing the package file.
*
* @hide
*/
@SystemApi
public static void processPackage(Context context,
File packageFile,
final ProgressListener listener)
throws IOException {
processPackage(context, packageFile, listener, null);
}
/**
* Reboots the device in order to install the given update
* package.
* Requires the {@link android.Manifest.permission#REBOOT} permission.
*
* @param context the Context to use
* @param packageFile the update package to install. Must be on
* a partition mountable by recovery. (The set of partitions
* known to recovery may vary from device to device. Generally,
* /cache and /data are safe.)
*
* @throws IOException if writing the recovery command file
* fails, or if the reboot itself fails.
*/
public static void installPackage(Context context, File packageFile)
throws IOException {
installPackage(context, packageFile, false);
}
/**
* If the package hasn't been processed (i.e. uncrypt'd), set up
* UNCRYPT_PACKAGE_FILE and delete BLOCK_MAP_FILE to trigger uncrypt during the
* reboot.
*
* @param context the Context to use
* @param packageFile the update package to install. Must be on a
* partition mountable by recovery.
* @param processed if the package has been processed (uncrypt'd).
*
* @throws IOException if writing the recovery command file fails, or if
* the reboot itself fails.
*
* @hide
*/
@SystemApi
public static void installPackage(Context context, File packageFile, boolean processed)
throws IOException {
synchronized (sRequestLock) {
LOG_FILE.delete();
// Must delete the file in case it was created by system server.
UNCRYPT_PACKAGE_FILE.delete();
String filename = packageFile.getCanonicalPath();
Log.w(TAG, "!!! REBOOTING TO INSTALL " + filename + " !!!");
// If the package name ends with "_s.zip", it's a security update.
boolean securityUpdate = filename.endsWith("_s.zip");
// If the package is on the /data partition, the package needs to
// be processed (i.e. uncrypt'd). The caller specifies if that has
// been done in 'processed' parameter.
if (filename.startsWith("/data/")) {
if (processed) {
if (!BLOCK_MAP_FILE.exists()) {
Log.e(TAG, "Package claimed to have been processed but failed to find "
+ "the block map file.");
throw new IOException("Failed to find block map file");
}
} else {
FileWriter uncryptFile = new FileWriter(UNCRYPT_PACKAGE_FILE);
try {
uncryptFile.write(filename + "\n");
} finally {
uncryptFile.close();
}
// UNCRYPT_PACKAGE_FILE needs to be readable and writable
// by system server.
if (!UNCRYPT_PACKAGE_FILE.setReadable(true, false)
|| !UNCRYPT_PACKAGE_FILE.setWritable(true, false)) {
Log.e(TAG, "Error setting permission for " + UNCRYPT_PACKAGE_FILE);
}
BLOCK_MAP_FILE.delete();
}
// If the package is on the /data partition, use the block map
// file as the package name instead.
filename = "@/cache/recovery/block.map";
}
final String filenameArg = "--update_package=" + filename + "\n";
final String localeArg = "--locale=" + Locale.getDefault().toString() + "\n";
final String securityArg = "--security\n";
String command = filenameArg + localeArg;
if (securityUpdate) {
command += securityArg;
}
RecoverySystem rs = (RecoverySystem) context.getSystemService(
Context.RECOVERY_SERVICE);
if (!rs.setupBcb(command)) {
throw new IOException("Setup BCB failed");
}
// Having set up the BCB (bootloader control block), go ahead and reboot
PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
pm.reboot(PowerManager.REBOOT_RECOVERY_UPDATE);
throw new IOException("Reboot failed (no permissions?)");
}
}
/**
* Schedule to install the given package on next boot. The caller needs to
* ensure that the package must have been processed (uncrypt'd) if needed.
* It sets up the command in BCB (bootloader control block), which will
* be read by the bootloader and the recovery image.
*
* @param Context the Context to use.
* @param packageFile the package to be installed.
*
* @throws IOException if there were any errors setting up the BCB.
*
* @hide
*/
@SystemApi
public static void scheduleUpdateOnBoot(Context context, File packageFile)
throws IOException {
String filename = packageFile.getCanonicalPath();
boolean securityUpdate = filename.endsWith("_s.zip");
// If the package is on the /data partition, use the block map file as
// the package name instead.
if (filename.startsWith("/data/")) {
filename = "@/cache/recovery/block.map";
}
final String filenameArg = "--update_package=" + filename + "\n";
final String localeArg = "--locale=" + Locale.getDefault().toString() + "\n";
final String securityArg = "--security\n";
String command = filenameArg + localeArg;
if (securityUpdate) {
command += securityArg;
}
RecoverySystem rs = (RecoverySystem) context.getSystemService(Context.RECOVERY_SERVICE);
if (!rs.setupBcb(command)) {
throw new IOException("schedule update on boot failed");
}
}
/**
* Cancel any scheduled update by clearing up the BCB (bootloader control
* block).
*
* @param Context the Context to use.
*
* @throws IOException if there were any errors clearing up the BCB.
*
* @hide
*/
@SystemApi
public static void cancelScheduledUpdate(Context context)
throws IOException {
RecoverySystem rs = (RecoverySystem) context.getSystemService(Context.RECOVERY_SERVICE);
if (!rs.clearBcb()) {
throw new IOException("cancel scheduled update failed");
}
}
/**
* Reboots the device and wipes the user data and cache
* partitions. This is sometimes called a "factory reset", which
* is something of a misnomer because the system partition is not
* restored to its factory state. Requires the
* {@link android.Manifest.permission#REBOOT} permission.
*
* @param context the Context to use
*
* @throws IOException if writing the recovery command file
* fails, or if the reboot itself fails.
* @throws SecurityException if the current user is not allowed to wipe data.
*/
public static void rebootWipeUserData(Context context) throws IOException {
rebootWipeUserData(context, false /* shutdown */, context.getPackageName(),
false /* force */);
}
/** {@hide} */
public static void rebootWipeUserData(Context context, String reason) throws IOException {
rebootWipeUserData(context, false /* shutdown */, reason, false /* force */);
}
/** {@hide} */
public static void rebootWipeUserData(Context context, boolean shutdown)
throws IOException {
rebootWipeUserData(context, shutdown, context.getPackageName(), false /* force */);
}
/**
* Reboots the device and wipes the user data and cache
* partitions. This is sometimes called a "factory reset", which
* is something of a misnomer because the system partition is not
* restored to its factory state. Requires the
* {@link android.Manifest.permission#REBOOT} permission.
*
* @param context the Context to use
* @param shutdown if true, the device will be powered down after
* the wipe completes, rather than being rebooted
* back to the regular system.
* @param reason the reason for the wipe that is visible in the logs
* @param force whether the {@link UserManager.DISALLOW_FACTORY_RESET} user restriction
* should be ignored
*
* @throws IOException if writing the recovery command file
* fails, or if the reboot itself fails.
* @throws SecurityException if the current user is not allowed to wipe data.
*
* @hide
*/
public static void rebootWipeUserData(Context context, boolean shutdown, String reason,
boolean force) throws IOException {
UserManager um = (UserManager) context.getSystemService(Context.USER_SERVICE);
if (!force && um.hasUserRestriction(UserManager.DISALLOW_FACTORY_RESET)) {
throw new SecurityException("Wiping data is not allowed for this user.");
}
final ConditionVariable condition = new ConditionVariable();
Intent intent = new Intent("android.intent.action.MASTER_CLEAR_NOTIFICATION");
intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
context.sendOrderedBroadcastAsUser(intent, UserHandle.SYSTEM,
android.Manifest.permission.MASTER_CLEAR,
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
condition.open();
}
}, null, 0, null, null);
// Block until the ordered broadcast has completed.
condition.block();
String shutdownArg = null;
if (shutdown) {
shutdownArg = "--shutdown_after";
}
String reasonArg = null;
if (!TextUtils.isEmpty(reason)) {
reasonArg = "--reason=" + sanitizeArg(reason);
}
final String localeArg = "--locale=" + Locale.getDefault().toString();
bootCommand(context, shutdownArg, "--wipe_data", reasonArg, localeArg);
}
/**
* Reboot into the recovery system to wipe the /cache partition.
* @throws IOException if something goes wrong.
*/
public static void rebootWipeCache(Context context) throws IOException {
rebootWipeCache(context, context.getPackageName());
}
/** {@hide} */
public static void rebootWipeCache(Context context, String reason) throws IOException {
String reasonArg = null;
if (!TextUtils.isEmpty(reason)) {
reasonArg = "--reason=" + sanitizeArg(reason);
}
final String localeArg = "--locale=" + Locale.getDefault().toString();
bootCommand(context, "--wipe_cache", reasonArg, localeArg);
}
/**
* Reboot into recovery and wipe the A/B device.
*
* @param Context the Context to use.
* @param packageFile the wipe package to be applied.
* @param reason the reason to wipe.
*
* @throws IOException if something goes wrong.
*
* @hide
*/
@SystemApi
public static void rebootWipeAb(Context context, File packageFile, String reason)
throws IOException {
String reasonArg = null;
if (!TextUtils.isEmpty(reason)) {
reasonArg = "--reason=" + sanitizeArg(reason);
}
final String filename = packageFile.getCanonicalPath();
final String filenameArg = "--wipe_package=" + filename;
final String localeArg = "--locale=" + Locale.getDefault().toString();
bootCommand(context, "--wipe_ab", filenameArg, reasonArg, localeArg);
}
/**
* Reboot into the recovery system with the supplied argument.
* @param args to pass to the recovery utility.
* @throws IOException if something goes wrong.
*/
private static void bootCommand(Context context, String... args) throws IOException {
LOG_FILE.delete();
StringBuilder command = new StringBuilder();
for (String arg : args) {
if (!TextUtils.isEmpty(arg)) {
command.append(arg);
command.append("\n");
}
}
// Write the command into BCB (bootloader control block) and boot from
// there. Will not return unless failed.
RecoverySystem rs = (RecoverySystem) context.getSystemService(Context.RECOVERY_SERVICE);
rs.rebootRecoveryWithCommand(command.toString());
throw new IOException("Reboot failed (no permissions?)");
}
// Read last_install; then report time (in seconds) and I/O (in MiB) for
// this update to tron.
// Only report on the reboots immediately after an OTA update.
private static void parseLastInstallLog(Context context) {
try (BufferedReader in = new BufferedReader(new FileReader(LAST_INSTALL_FILE))) {
String line = null;
int bytesWrittenInMiB = -1, bytesStashedInMiB = -1;
int timeTotal = -1;
int uncryptTime = -1;
int sourceVersion = -1;
while ((line = in.readLine()) != null) {
// Here is an example of lines in last_install:
// ...
// time_total: 101
// bytes_written_vendor: 51074
// bytes_stashed_vendor: 200
int numIndex = line.indexOf(':');
if (numIndex == -1 || numIndex + 1 >= line.length()) {
continue;
}
String numString = line.substring(numIndex + 1).trim();
long parsedNum;
try {
parsedNum = Long.parseLong(numString);
} catch (NumberFormatException ignored) {
Log.e(TAG, "Failed to parse numbers in " + line);
continue;
}
final int MiB = 1024 * 1024;
int scaled;
try {
if (line.startsWith("bytes")) {
scaled = Math.toIntExact(parsedNum / MiB);
} else {
scaled = Math.toIntExact(parsedNum);
}
} catch (ArithmeticException ignored) {
Log.e(TAG, "Number overflows in " + line);
continue;
}
if (line.startsWith("time")) {
timeTotal = scaled;
} else if (line.startsWith("uncrypt_time")) {
uncryptTime = scaled;
} else if (line.startsWith("source_build")) {
sourceVersion = scaled;
} else if (line.startsWith("bytes_written")) {
bytesWrittenInMiB = (bytesWrittenInMiB == -1) ? scaled :
bytesWrittenInMiB + scaled;
} else if (line.startsWith("bytes_stashed")) {
bytesStashedInMiB = (bytesStashedInMiB == -1) ? scaled :
bytesStashedInMiB + scaled;
}
}
// Don't report data to tron if corresponding entry isn't found in last_install.
if (timeTotal != -1) {
MetricsLogger.histogram(context, "ota_time_total", timeTotal);
}
if (uncryptTime != -1) {
MetricsLogger.histogram(context, "ota_uncrypt_time", uncryptTime);
}
if (sourceVersion != -1) {
MetricsLogger.histogram(context, "ota_source_version", sourceVersion);
}
if (bytesWrittenInMiB != -1) {
MetricsLogger.histogram(context, "ota_written_in_MiBs", bytesWrittenInMiB);
}
if (bytesStashedInMiB != -1) {
MetricsLogger.histogram(context, "ota_stashed_in_MiBs", bytesStashedInMiB);
}
} catch (IOException e) {
Log.e(TAG, "Failed to read lines in last_install", e);
}
}
/**
* Called after booting to process and remove recovery-related files.
* @return the log file from recovery, or null if none was found.
*
* @hide
*/
public static String handleAftermath(Context context) {
// Record the tail of the LOG_FILE
String log = null;
try {
log = FileUtils.readTextFile(LOG_FILE, -LOG_FILE_MAX_LENGTH, "...\n");
} catch (FileNotFoundException e) {
Log.i(TAG, "No recovery log file");
} catch (IOException e) {
Log.e(TAG, "Error reading recovery log", e);
}
if (log != null) {
parseLastInstallLog(context);
}
// Only remove the OTA package if it's partially processed (uncrypt'd).
boolean reservePackage = BLOCK_MAP_FILE.exists();
if (!reservePackage && UNCRYPT_PACKAGE_FILE.exists()) {
String filename = null;
try {
filename = FileUtils.readTextFile(UNCRYPT_PACKAGE_FILE, 0, null);
} catch (IOException e) {
Log.e(TAG, "Error reading uncrypt file", e);
}
// Remove the OTA package on /data that has been (possibly
// partially) processed. (Bug: 24973532)
if (filename != null && filename.startsWith("/data")) {
if (UNCRYPT_PACKAGE_FILE.delete()) {
Log.i(TAG, "Deleted: " + filename);
} else {
Log.e(TAG, "Can't delete: " + filename);
}
}
}
// We keep the update logs (beginning with LAST_PREFIX), and optionally
// the block map file (BLOCK_MAP_FILE) for a package. BLOCK_MAP_FILE
// will be created at the end of a successful uncrypt. If seeing this
// file, we keep the block map file and the file that contains the
// package name (UNCRYPT_PACKAGE_FILE). This is to reduce the work for
// GmsCore to avoid re-downloading everything again.
String[] names = RECOVERY_DIR.list();
for (int i = 0; names != null && i < names.length; i++) {
if (names[i].startsWith(LAST_PREFIX)) continue;
if (reservePackage && names[i].equals(BLOCK_MAP_FILE.getName())) continue;
if (reservePackage && names[i].equals(UNCRYPT_PACKAGE_FILE.getName())) continue;
recursiveDelete(new File(RECOVERY_DIR, names[i]));
}
return log;
}
/**
* Internally, delete a given file or directory recursively.
*/
private static void recursiveDelete(File name) {
if (name.isDirectory()) {
String[] files = name.list();
for (int i = 0; files != null && i < files.length; i++) {
File f = new File(name, files[i]);
recursiveDelete(f);
}
}
if (!name.delete()) {
Log.e(TAG, "Can't delete: " + name);
} else {
Log.i(TAG, "Deleted: " + name);
}
}
/**
* Talks to RecoverySystemService via Binder to trigger uncrypt.
*/
private boolean uncrypt(String packageFile, IRecoverySystemProgressListener listener) {
try {
return mService.uncrypt(packageFile, listener);
} catch (RemoteException unused) {
}
return false;
}
/**
* Talks to RecoverySystemService via Binder to set up the BCB.
*/
private boolean setupBcb(String command) {
try {
return mService.setupBcb(command);
} catch (RemoteException unused) {
}
return false;
}
/**
* Talks to RecoverySystemService via Binder to clear up the BCB.
*/
private boolean clearBcb() {
try {
return mService.clearBcb();
} catch (RemoteException unused) {
}
return false;
}
/**
* Talks to RecoverySystemService via Binder to set up the BCB command and
* reboot into recovery accordingly.
*/
private void rebootRecoveryWithCommand(String command) {
try {
mService.rebootRecoveryWithCommand(command);
} catch (RemoteException ignored) {
}
}
/**
* Internally, recovery treats each line of the command file as a separate
* argv, so we only need to protect against newlines and nulls.
*/
private static String sanitizeArg(String arg) {
arg = arg.replace('\0', '?');
arg = arg.replace('\n', '?');
return arg;
}
/**
* @removed Was previously made visible by accident.
*/
public RecoverySystem() {
mService = null;
}
/**
* @hide
*/
public RecoverySystem(IRecoverySystem service) {
mService = service;
}
}