| /* |
| * 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.INetd; |
| import android.net.INetworkMonitor; |
| import android.net.INetworkMonitorCallbacks; |
| import android.net.INetworkStackConnector; |
| import android.net.Network; |
| 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.ip.IIpClientCallbacks; |
| import android.net.ip.IpClient; |
| 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.lang.ref.WeakReference; |
| import java.util.ArrayDeque; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| |
| /** |
| * 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(); |
| private static NetworkStackConnector sConnector; |
| |
| /** |
| * 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 synchronized IBinder makeConnector(Context context) { |
| if (sConnector == null) { |
| sConnector = new NetworkStackConnector(context); |
| } |
| return sConnector; |
| } |
| |
| @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 INetd mNetd; |
| private final NetworkObserverRegistry mObserverRegistry; |
| private final ConnectivityManager mCm; |
| @GuardedBy("mIpClients") |
| private final ArrayList<WeakReference<IpClient>> mIpClients = new ArrayList<>(); |
| |
| 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; |
| mNetd = INetd.Stub.asInterface( |
| (IBinder) context.getSystemService(Context.NETD_SERVICE)); |
| mObserverRegistry = new NetworkObserverRegistry(); |
| mCm = context.getSystemService(ConnectivityManager.class); |
| |
| try { |
| mObserverRegistry.register(mNetd); |
| } catch (RemoteException e) { |
| mLog.e("Error registering observer on Netd", e); |
| } |
| } |
| |
| @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(Network network, String name, INetworkMonitorCallbacks cb) |
| throws RemoteException { |
| final SharedLog log = addValidationLogs(network, name); |
| final NetworkMonitor nm = new NetworkMonitor(mContext, cb, network, log); |
| cb.onNetworkMonitorCreated(new NetworkMonitorImpl(nm)); |
| } |
| |
| @Override |
| public void makeIpClient(String ifName, IIpClientCallbacks cb) throws RemoteException { |
| final IpClient ipClient = new IpClient(mContext, ifName, cb, mObserverRegistry); |
| |
| synchronized (mIpClients) { |
| final Iterator<WeakReference<IpClient>> it = mIpClients.iterator(); |
| while (it.hasNext()) { |
| final IpClient ipc = it.next().get(); |
| if (ipc == null) { |
| it.remove(); |
| } |
| } |
| mIpClients.add(new WeakReference<>(ipClient)); |
| } |
| |
| cb.onIpClientCreated(ipClient.makeConnector()); |
| } |
| |
| @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); |
| |
| // Dump full IpClient logs for non-GCed clients |
| pw.println(); |
| pw.println("Recently active IpClient logs:"); |
| final ArrayList<IpClient> ipClients = new ArrayList<>(); |
| final HashSet<String> dumpedIpClientIfaces = new HashSet<>(); |
| synchronized (mIpClients) { |
| for (WeakReference<IpClient> ipcRef : mIpClients) { |
| final IpClient ipc = ipcRef.get(); |
| if (ipc != null) { |
| ipClients.add(ipc); |
| } |
| } |
| } |
| |
| for (IpClient ipc : ipClients) { |
| pw.println(ipc.getName()); |
| pw.increaseIndent(); |
| ipc.dump(fd, pw, args); |
| pw.decreaseIndent(); |
| dumpedIpClientIfaces.add(ipc.getInterfaceName()); |
| } |
| |
| // State machine and connectivity metrics logs are kept for GCed IpClients |
| pw.println(); |
| pw.println("Other IpClient logs:"); |
| IpClient.dumpAllLogs(fout, dumpedIpClientIfaces); |
| |
| 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 notifyCaptivePortalAppFinished(int response) { |
| checkNetworkStackCallingPermission(); |
| mNm.notifyCaptivePortalAppFinished(response); |
| } |
| |
| @Override |
| public void notifyAcceptPartialConnectivity() { |
| checkNetworkStackCallingPermission(); |
| mNm.notifyAcceptPartialConnectivity(); |
| } |
| |
| @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(); |
| } |
| } |
| } |