| /* |
| * Copyright (C) 2018 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; |
| |
| import static android.os.Binder.getCallingUid; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.Service; |
| import android.content.Intent; |
| import android.net.INetworkStackConnector; |
| import android.os.IBinder; |
| import android.os.Process; |
| |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| |
| /** |
| * Android service used to start the network stack when bound to via an intent. |
| * |
| * <p>The service returns a binder for the system server to communicate with the network stack. |
| */ |
| public class NetworkStackService extends Service { |
| private static final String TAG = NetworkStackService.class.getSimpleName(); |
| |
| /** |
| * Create a binder connector for the system server to communicate with the network stack. |
| * |
| * <p>On platforms where the network stack runs in the system server process, this method may |
| * be called directly instead of obtaining the connector by binding to the service. |
| */ |
| public static IBinder makeConnector() { |
| return new NetworkStackConnector(); |
| } |
| |
| @NonNull |
| @Override |
| public IBinder onBind(Intent intent) { |
| return makeConnector(); |
| } |
| |
| private static class NetworkStackConnector extends INetworkStackConnector.Stub { |
| // TODO: makeDhcpServer(), etc. will go here. |
| |
| @Override |
| protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter fout, |
| @Nullable String[] args) { |
| checkCaller(); |
| fout.println("NetworkStack logs:"); |
| // TODO: dump logs here |
| } |
| } |
| |
| private static void checkCaller() { |
| // TODO: check that the calling PID is the system server. |
| if (getCallingUid() != Process.SYSTEM_UID && getCallingUid() != Process.ROOT_UID) { |
| throw new SecurityException("Invalid caller: " + getCallingUid()); |
| } |
| } |
| } |