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/*
* 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_.]", "");
}
}
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