content: /*
   * 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 android.net;
  
  import android.annotation.NonNull;
  import android.os.ParcelFileDescriptor;
  import android.os.RemoteException;
  import android.util.Log;
  
  import java.net.InetAddress;
  import java.util.concurrent.Executor;
  
  /** @hide */
  public final class NattSocketKeepalive extends SocketKeepalive {
      /** The NAT-T destination port for IPsec */
      public static final int NATT_PORT = 4500;
  
      @NonNull private final InetAddress mSource;
      @NonNull private final InetAddress mDestination;
      private final int mResourceId;
  
      NattSocketKeepalive(@NonNull IConnectivityManager service,
              @NonNull Network network,
              @NonNull ParcelFileDescriptor pfd,
              int resourceId,
              @NonNull InetAddress source,
              @NonNull InetAddress destination,
              @NonNull Executor executor,
              @NonNull Callback callback) {
          super(service, network, pfd, executor, callback);
          mSource = source;
          mDestination = destination;
          mResourceId = resourceId;
      }
  
      @Override
      void startImpl(int intervalSec) {
          mExecutor.execute(() -> {
              try {
                  mService.startNattKeepaliveWithFd(mNetwork, mPfd.getFileDescriptor(), mResourceId,
                          intervalSec, mCallback,
                          mSource.getHostAddress(), mDestination.getHostAddress());
              } catch (RemoteException e) {
                  Log.e(TAG, "Error starting socket keepalive: ", e);
                  throw e.rethrowFromSystemServer();
              }
          });
      }
  
      @Override
      void stopImpl() {
          mExecutor.execute(() -> {
              try {
                  if (mSlot != null) {
                      mService.stopKeepalive(mNetwork, mSlot);
                  }
              } catch (RemoteException e) {
                  Log.e(TAG, "Error stopping socket keepalive: ", e);
                  throw e.rethrowFromSystemServer();
              }
          });
      }
  }
  