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/*
* Copyright (C) 2024 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.server.crashrecovery;
import android.annotation.AnyThread;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.VersionedPackage;
import android.net.ConnectivityModuleConnector;
import android.text.TextUtils;
import android.util.Slog;
import com.android.server.PackageWatchdog;
import com.android.server.pm.ApexManager;
import java.util.Collections;
import java.util.List;
/**
* Provides helper methods for the CrashRecovery APEX
*
* @hide
*/
public final class CrashRecoveryHelper {
private static final String TAG = "CrashRecoveryHelper";
private final ApexManager mApexManager;
private final Context mContext;
private final ConnectivityModuleConnector mConnectivityModuleConnector;
/** @hide */
public CrashRecoveryHelper(@NonNull Context context) {
mContext = context;
mApexManager = ApexManager.getInstance();
mConnectivityModuleConnector = ConnectivityModuleConnector.getInstance();
}
/**
* Returns true if the package name is the name of a module.
* If the package is an APK inside an APEX then it will use the parent's APEX package name
* do determine if it is a module or not.
* @hide
*/
@AnyThread
public boolean isModule(@NonNull String packageName) {
String apexPackageName =
mApexManager.getActiveApexPackageNameContainingPackage(packageName);
if (apexPackageName != null) {
packageName = apexPackageName;
}
PackageManager pm = mContext.getPackageManager();
try {
return pm.getModuleInfo(packageName, 0) != null;
} catch (PackageManager.NameNotFoundException ignore) {
return false;
}
}
/**
* Register health listeners for explicit package failures.
* Currently only registering for Connectivity Module health.
* @hide
*/
public void registerConnectivityModuleHealthListener(@NonNull int failureReason) {
// register listener for ConnectivityModule
mConnectivityModuleConnector.registerHealthListener(
packageName -> {
final VersionedPackage pkg = getVersionedPackage(packageName);
if (pkg == null) {
Slog.wtf(TAG, "NetworkStack failed but could not find its package");
return;
}
final List<VersionedPackage> pkgList = Collections.singletonList(pkg);
PackageWatchdog.getInstance(mContext).onPackageFailure(pkgList, failureReason);
});
}
@Nullable
private VersionedPackage getVersionedPackage(String packageName) {
final PackageManager pm = mContext.getPackageManager();
if (pm == null || TextUtils.isEmpty(packageName)) {
return null;
}
try {
final long versionCode = getPackageInfo(packageName).getLongVersionCode();
return new VersionedPackage(packageName, versionCode);
} catch (PackageManager.NameNotFoundException e) {
return null;
}
}
/**
* Gets PackageInfo for the given package. Matches any user and apex.
*
* @throws PackageManager.NameNotFoundException if no such package is installed.
*/
private PackageInfo getPackageInfo(String packageName)
throws PackageManager.NameNotFoundException {
PackageManager pm = mContext.getPackageManager();
try {
// The MATCH_ANY_USER flag doesn't mix well with the MATCH_APEX
// flag, so make two separate attempts to get the package info.
// We don't need both flags at the same time because we assume
// apex files are always installed for all users.
return pm.getPackageInfo(packageName, PackageManager.MATCH_ANY_USER);
} catch (PackageManager.NameNotFoundException e) {
return pm.getPackageInfo(packageName, PackageManager.MATCH_APEX);
}
}
}
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