Add DnsResolverServiceManager

    method @Deprecated public void onUpstreamChanged(@Nullable android.net.Network);

  }

  public class DnsResolverServiceManager {

    method @NonNull @RequiresPermission(android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK) public static android.os.IBinder getService(@NonNull android.content.Context);

  }

  public class EthernetManager {

    method @NonNull @RequiresPermission(anyOf={android.Manifest.permission.NETWORK_STACK, android.net.NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK}) public android.net.EthernetManager.TetheredInterfaceRequest requestTetheredInterface(@NonNull java.util.concurrent.Executor, @NonNull android.net.EthernetManager.TetheredInterfaceCallback);

  }

/*

 * Copyright (C) 2020 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.annotation.RequiresPermission;

import android.annotation.SystemApi;

import android.content.Context;

import android.os.IBinder;

import android.os.ServiceManager;

import java.util.Objects;

/**

 * Provides a way to obtain the DnsResolver binder objects.

 *

 * @hide

 */

@SystemApi

public class DnsResolverServiceManager {

    /**

     * Name to retrieve a {@link android.net.IDnsResolver} IBinder.

     */

    private static final String DNS_RESOLVER_SERVICE = "dnsresolver";

    private DnsResolverServiceManager() {}

    /**

     * Get an {@link IBinder} representing the DnsResolver stable AIDL interface

     *

     * @param context the context for permission check.

     * @return {@link android.net.IDnsResolver} IBinder.

     */

    @NonNull

    @RequiresPermission(NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK)

    public static IBinder getService(@NonNull final Context context) {

        Objects.requireNonNull(context);

        context.enforceCallingOrSelfPermission(NetworkStack.PERMISSION_MAINLINE_NETWORK_STACK,

                "DnsResolverServiceManager");

        try {

            return ServiceManager.getServiceOrThrow(DNS_RESOLVER_SERVICE);

        } catch (ServiceManager.ServiceNotFoundException e) {

            // Catch ServiceManager#ServiceNotFoundException and rethrow IllegalStateException

            // because ServiceManager#ServiceNotFoundException is @hide so that it can't be listed

            // on the system api. Thus, rethrow IllegalStateException if dns resolver service cannot

            // be found.

            throw new IllegalStateException("Cannot find dns resolver service.");

        }

    }

}