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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.checkDumpPermission;
import static com.android.server.util.PermissionUtil.checkNetworkStackCallingPermission;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.INetworkMonitor;
import android.net.INetworkMonitorCallbacks;
import android.net.INetworkStackConnector;
import android.net.Network;
import android.net.NetworkRequest;
import android.net.PrivateDnsConfigParcel;
import android.net.dhcp.DhcpServer;
import android.net.dhcp.DhcpServingParams;
import android.net.dhcp.DhcpServingParamsParcel;
import android.net.dhcp.IDhcpServerCallbacks;
import android.net.shared.PrivateDnsConfig;
import android.net.util.SharedLog;
import android.os.IBinder;
import android.os.RemoteException;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.util.IndentingPrintWriter;
import com.android.server.connectivity.NetworkMonitor;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayDeque;
/**
* 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(Context context) {
return new NetworkStackConnector(context);
}
@NonNull
@Override
public IBinder onBind(Intent intent) {
return makeConnector(this);
}
private static class NetworkStackConnector extends INetworkStackConnector.Stub {
private static final int NUM_VALIDATION_LOG_LINES = 20;
private final Context mContext;
private final ConnectivityManager mCm;
private static final int MAX_VALIDATION_LOGS = 10;
@GuardedBy("mValidationLogs")
private final ArrayDeque<SharedLog> mValidationLogs = new ArrayDeque<>(MAX_VALIDATION_LOGS);
private SharedLog addValidationLogs(Network network, String name) {
final SharedLog log = new SharedLog(NUM_VALIDATION_LOG_LINES, network + " - " + name);
synchronized (mValidationLogs) {
while (mValidationLogs.size() >= MAX_VALIDATION_LOGS) {
mValidationLogs.removeLast();
}
mValidationLogs.addFirst(log);
}
return log;
}
NetworkStackConnector(Context context) {
mContext = context;
mCm = context.getSystemService(ConnectivityManager.class);
}
@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
public void makeNetworkMonitor(int netId, String name, INetworkMonitorCallbacks cb)
throws RemoteException {
final Network network = new Network(netId, false /* privateDnsBypass */);
final NetworkRequest defaultRequest = mCm.getDefaultRequest();
final SharedLog log = addValidationLogs(network, name);
final NetworkMonitor nm = new NetworkMonitor(
mContext, cb, network, defaultRequest, log);
cb.onNetworkMonitorCreated(new NetworkMonitorImpl(nm));
}
@Override
protected void dump(@NonNull FileDescriptor fd, @NonNull PrintWriter fout,
@Nullable String[] args) {
checkDumpPermission();
final IndentingPrintWriter pw = new IndentingPrintWriter(fout, " ");
pw.println("NetworkStack logs:");
mLog.dump(fd, pw, args);
pw.println();
pw.println("Validation logs (most recent first):");
synchronized (mValidationLogs) {
for (SharedLog p : mValidationLogs) {
pw.println(p.getTag());
pw.increaseIndent();
p.dump(fd, pw, args);
pw.decreaseIndent();
}
}
}
}
private static class NetworkMonitorImpl extends INetworkMonitor.Stub {
private final NetworkMonitor mNm;
NetworkMonitorImpl(NetworkMonitor nm) {
mNm = nm;
}
@Override
public void start() {
checkNetworkStackCallingPermission();
mNm.start();
}
@Override
public void launchCaptivePortalApp() {
checkNetworkStackCallingPermission();
mNm.launchCaptivePortalApp();
}
@Override
public void forceReevaluation(int uid) {
checkNetworkStackCallingPermission();
mNm.forceReevaluation(uid);
}
@Override
public void notifyPrivateDnsChanged(PrivateDnsConfigParcel config) {
checkNetworkStackCallingPermission();
mNm.notifyPrivateDnsSettingsChanged(PrivateDnsConfig.fromParcel(config));
}
@Override
public void notifyDnsResponse(int returnCode) {
checkNetworkStackCallingPermission();
mNm.notifyDnsResponse(returnCode);
}
@Override
public void notifySystemReady() {
checkNetworkStackCallingPermission();
mNm.notifySystemReady();
}
@Override
public void notifyNetworkConnected() {
checkNetworkStackCallingPermission();
mNm.notifyNetworkConnected();
}
@Override
public void notifyNetworkDisconnected() {
checkNetworkStackCallingPermission();
mNm.notifyNetworkDisconnected();
}
@Override
public void notifyLinkPropertiesChanged() {
checkNetworkStackCallingPermission();
mNm.notifyLinkPropertiesChanged();
}
@Override
public void notifyNetworkCapabilitiesChanged() {
checkNetworkStackCallingPermission();
mNm.notifyNetworkCapabilitiesChanged();
}
}
}
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