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/*
* 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.net.dhcp.IDhcpServer.STATUS_INVALID_ARGUMENT;
import static android.net.dhcp.IDhcpServer.STATUS_SUCCESS;
import static android.net.dhcp.IDhcpServer.STATUS_UNKNOWN_ERROR;
import static com.android.server.util.PermissionUtil.checkNetworkStackCallingPermission;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.Service;
import android.content.Intent;
import android.net.INetworkStackConnector;
import android.net.dhcp.DhcpServer;
import android.net.dhcp.DhcpServingParams;
import android.net.dhcp.DhcpServingParamsParcel;
import android.net.dhcp.IDhcpServerCallbacks;
import android.net.util.SharedLog;
import android.os.IBinder;
import android.os.RemoteException;
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 {
@NonNull
private final SharedLog mLog = new SharedLog(TAG);
@Override
public void makeDhcpServer(@NonNull String ifName, @NonNull DhcpServingParamsParcel params,
@NonNull IDhcpServerCallbacks cb) throws RemoteException {
checkNetworkStackCallingPermission();
final DhcpServer server;
try {
server = new DhcpServer(
ifName,
DhcpServingParams.fromParcelableObject(params),
mLog.forSubComponent(ifName + ".DHCP"));
} catch (DhcpServingParams.InvalidParameterException e) {
mLog.e("Invalid DhcpServingParams", e);
cb.onDhcpServerCreated(STATUS_INVALID_ARGUMENT, null);
return;
} catch (Exception e) {
mLog.e("Unknown error starting DhcpServer", e);
cb.onDhcpServerCreated(STATUS_UNKNOWN_ERROR, null);
return;
}
cb.onDhcpServerCreated(STATUS_SUCCESS, server);
}
@Override
protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter fout,
@Nullable String[] args) {
checkNetworkStackCallingPermission();
fout.println("NetworkStack logs:");
mLog.dump(fd, fout, args);
}
}
}
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