| /* |
| * Copyright (C) 2019 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.shell; |
| |
| import android.annotation.NonNull; |
| import android.content.ContentProvider; |
| import android.content.ContentValues; |
| import android.database.Cursor; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.ParcelFileDescriptor; |
| import android.os.Process; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| |
| /** ContentProvider to write and access heap dumps. */ |
| public class HeapDumpProvider extends ContentProvider { |
| private static final String FILENAME_SUFFIX = "_javaheap.bin"; |
| private static final Object sLock = new Object(); |
| |
| private File mRoot; |
| |
| @Override |
| public boolean onCreate() { |
| synchronized (sLock) { |
| mRoot = new File(getContext().createCredentialProtectedStorageContext().getFilesDir(), |
| "heapdumps"); |
| return mRoot.mkdir(); |
| } |
| } |
| |
| @Override |
| public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, |
| String sortOrder) { |
| return null; |
| } |
| |
| @Override |
| public String getType(Uri uri) { |
| return "application/octet-stream"; |
| } |
| |
| @Override |
| public Uri insert(Uri uri, ContentValues values) { |
| throw new UnsupportedOperationException("Insert not allowed."); |
| } |
| |
| @Override |
| public int delete(Uri uri, String selection, String[] selectionArgs) { |
| String path = sanitizePath(uri.getEncodedPath()); |
| String tag = Uri.decode(path); |
| return (new File(mRoot, tag)).delete() ? 1 : 0; |
| } |
| |
| @Override |
| public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { |
| throw new UnsupportedOperationException("Update not allowed."); |
| } |
| |
| @Override |
| public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException { |
| String path = sanitizePath(uri.getEncodedPath()); |
| String tag = Uri.decode(path); |
| final int pMode; |
| if (Binder.getCallingUid() == Process.SYSTEM_UID) { |
| pMode = ParcelFileDescriptor.MODE_CREATE |
| | ParcelFileDescriptor.MODE_TRUNCATE |
| | ParcelFileDescriptor.MODE_WRITE_ONLY; |
| } else { |
| pMode = ParcelFileDescriptor.MODE_READ_ONLY; |
| } |
| |
| synchronized (sLock) { |
| return ParcelFileDescriptor.open(new File(mRoot, tag), pMode); |
| } |
| } |
| |
| @NonNull |
| static Uri makeUri(@NonNull String procName) { |
| return Uri.parse("content://com.android.shell.heapdump/" + procName + FILENAME_SUFFIX); |
| } |
| |
| private String sanitizePath(String path) { |
| return path.replaceAll("[^a-zA-Z0-9_.]", ""); |
| } |
| } |