| /* |
| * Copyright (C) 2016 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.devicepolicy; |
| |
| import android.app.admin.DeviceAdminReceiver; |
| import android.app.admin.ConnectEvent; |
| import android.app.admin.DnsEvent; |
| import android.app.admin.NetworkEvent; |
| import android.net.IIpConnectivityMetrics; |
| import android.net.INetdEventCallback; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * A Handler class for managing network logging on a background thread. |
| */ |
| final class NetworkLoggingHandler extends Handler { |
| |
| private static final String TAG = NetworkLoggingHandler.class.getSimpleName(); |
| |
| static final String NETWORK_EVENT_KEY = "network_event"; |
| |
| // est. ~128kB of memory usage per full batch TODO(mkarpinski): fine tune based on testing data |
| // If this value changes, update DevicePolicyManager#retrieveNetworkLogs() javadoc |
| private static final int MAX_EVENTS_PER_BATCH = 1200; |
| static final long BATCH_FINALIZATION_TIMEOUT_MS = TimeUnit.MINUTES.toMillis(90); |
| |
| static final int LOG_NETWORK_EVENT_MSG = 1; |
| static final int FINALIZE_BATCH_MSG = 2; |
| |
| private final DevicePolicyManagerService mDpm; |
| |
| // threadsafe as it's Handler's thread confined |
| @GuardedBy("this") |
| private ArrayList<NetworkEvent> mNetworkEvents = new ArrayList<NetworkEvent>(); |
| |
| @GuardedBy("this") |
| private ArrayList<NetworkEvent> mFullBatch; |
| |
| // each full batch is represented by its token, which the DPC has to provide back to revieve it |
| @GuardedBy("this") |
| private long mCurrentFullBatchToken; |
| |
| NetworkLoggingHandler(Looper looper, DevicePolicyManagerService dpm) { |
| super(looper); |
| mDpm = dpm; |
| } |
| |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case LOG_NETWORK_EVENT_MSG: { |
| NetworkEvent networkEvent = msg.getData().getParcelable(NETWORK_EVENT_KEY); |
| if (networkEvent != null) { |
| mNetworkEvents.add(networkEvent); |
| if (mNetworkEvents.size() >= MAX_EVENTS_PER_BATCH) { |
| finalizeBatchAndNotifyDeviceOwner(); |
| } |
| } |
| break; |
| } |
| case FINALIZE_BATCH_MSG: { |
| finalizeBatchAndNotifyDeviceOwner(); |
| break; |
| } |
| } |
| } |
| |
| void scheduleBatchFinalization(long delay) { |
| removeMessages(FINALIZE_BATCH_MSG); |
| sendMessageDelayed(obtainMessage(FINALIZE_BATCH_MSG), delay); |
| } |
| |
| private synchronized void finalizeBatchAndNotifyDeviceOwner() { |
| mFullBatch = mNetworkEvents; |
| // start a new batch from scratch |
| mNetworkEvents = new ArrayList<NetworkEvent>(); |
| scheduleBatchFinalization(BATCH_FINALIZATION_TIMEOUT_MS); |
| // notify DO that there's a new non-empty batch waiting |
| if (mFullBatch.size() > 0) { |
| mCurrentFullBatchToken++; |
| Bundle extras = new Bundle(); |
| extras.putLong(DeviceAdminReceiver.EXTRA_NETWORK_LOGS_TOKEN, mCurrentFullBatchToken); |
| extras.putInt(DeviceAdminReceiver.EXTRA_NETWORK_LOGS_COUNT, mFullBatch.size()); |
| Log.d(TAG, "Sending network logging batch broadcast to device owner, batchToken: " |
| + mCurrentFullBatchToken); |
| mDpm.sendDeviceOwnerCommand(DeviceAdminReceiver.ACTION_NETWORK_LOGS_AVAILABLE, extras); |
| } else { |
| mFullBatch = null; |
| } |
| } |
| |
| synchronized List<NetworkEvent> retrieveFullLogBatch(long batchToken) { |
| if (batchToken != mCurrentFullBatchToken) { |
| return null; |
| } |
| return mFullBatch; |
| } |
| } |
| |