| /* |
| * Copyright (C) 2013 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.cellbroadcastservice; |
| |
| import static android.Manifest.permission.ACCESS_COARSE_LOCATION; |
| import static android.Manifest.permission.ACCESS_FINE_LOCATION; |
| |
| import static com.android.cellbroadcastservice.CbSendMessageCalculator.SEND_MESSAGE_ACTION_AMBIGUOUS; |
| import static com.android.cellbroadcastservice.CbSendMessageCalculator.SEND_MESSAGE_ACTION_DONT_SEND; |
| import static com.android.cellbroadcastservice.CbSendMessageCalculator.SEND_MESSAGE_ACTION_NO_COORDINATES; |
| import static com.android.cellbroadcastservice.CbSendMessageCalculator.SEND_MESSAGE_ACTION_SEND; |
| import static com.android.cellbroadcastservice.CbSendMessageCalculator.SEND_MESSAGE_ACTION_SENT; |
| import static com.android.cellbroadcastservice.CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_ERROR__TYPE__UNEXPECTED_CDMA_MESSAGE_TYPE_FROM_FWK; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.app.Activity; |
| import android.content.BroadcastReceiver; |
| import android.content.ContentValues; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.pm.ApplicationInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| import android.content.res.Resources; |
| import android.database.Cursor; |
| import android.location.Location; |
| import android.location.LocationListener; |
| import android.location.LocationManager; |
| import android.location.LocationRequest; |
| import android.net.Uri; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.HandlerExecutor; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.provider.Telephony; |
| import android.provider.Telephony.CellBroadcasts; |
| import android.telephony.CbGeoUtils.LatLng; |
| import android.telephony.CellBroadcastIntents; |
| import android.telephony.SmsCbMessage; |
| import android.telephony.SubscriptionManager; |
| import android.telephony.cdma.CdmaSmsCbProgramData; |
| import android.text.TextUtils; |
| import android.util.LocalLog; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.PrintWriter; |
| import java.text.DateFormat; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.TimeUnit; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * Dispatch new Cell Broadcasts to receivers. Acquires a private wakelock until the broadcast |
| * completes and our result receiver is called. |
| */ |
| public class CellBroadcastHandler extends WakeLockStateMachine { |
| private static final String TAG = "CellBroadcastHandler"; |
| |
| /** |
| * CellBroadcast apex name |
| */ |
| private static final String CB_APEX_NAME = "com.android.cellbroadcast"; |
| |
| /** |
| * Path where CB apex is mounted (/apex/com.android.cellbroadcast) |
| */ |
| private static final String CB_APEX_PATH = new File("/apex", CB_APEX_NAME).getAbsolutePath(); |
| |
| private static final String EXTRA_MESSAGE = "message"; |
| |
| /** |
| * To disable cell broadcast duplicate detection for debugging purposes |
| * <code>adb shell am broadcast -a com.android.cellbroadcastservice.action.DUPLICATE_DETECTION |
| * --ez enable false</code> |
| * |
| * To enable cell broadcast duplicate detection for debugging purposes |
| * <code>adb shell am broadcast -a com.android.cellbroadcastservice.action.DUPLICATE_DETECTION |
| * --ez enable true</code> |
| */ |
| private static final String ACTION_DUPLICATE_DETECTION = |
| "com.android.cellbroadcastservice.action.DUPLICATE_DETECTION"; |
| |
| /** |
| * The extra for cell broadcast duplicate detection enable/disable |
| */ |
| private static final String EXTRA_ENABLE = "enable"; |
| |
| private final LocalLog mLocalLog = new LocalLog(100); |
| |
| private static final boolean IS_DEBUGGABLE = SystemProperties.getInt("ro.debuggable", 0) == 1; |
| |
| /** Uses to request the location update. */ |
| private final LocationRequester mLocationRequester; |
| |
| /** Used to inject new calculators during unit testing */ |
| @NonNull protected final CbSendMessageCalculatorFactory mCbSendMessageCalculatorFactory; |
| |
| /** Timestamp of last airplane mode on */ |
| protected long mLastAirplaneModeTime = 0; |
| |
| /** Resource cache */ |
| private final Map<Integer, Resources> mResourcesCache = new HashMap<>(); |
| |
| /** Whether performing duplicate detection or not. Note this is for debugging purposes only. */ |
| private boolean mEnableDuplicateDetection = true; |
| |
| /** |
| * Service category equivalent map. The key is the GSM service category, the value is the CDMA |
| * service category. |
| */ |
| private final Map<Integer, Integer> mServiceCategoryCrossRATMap; |
| |
| private BroadcastReceiver mReceiver = new BroadcastReceiver() { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| switch (intent.getAction()) { |
| case Intent.ACTION_AIRPLANE_MODE_CHANGED: |
| boolean airplaneModeOn = intent.getBooleanExtra("state", false); |
| if (airplaneModeOn) { |
| mLastAirplaneModeTime = System.currentTimeMillis(); |
| log("Airplane mode on."); |
| } |
| break; |
| case ACTION_DUPLICATE_DETECTION: |
| mEnableDuplicateDetection = intent.getBooleanExtra(EXTRA_ENABLE, |
| true); |
| log("Duplicate detection " + (mEnableDuplicateDetection |
| ? "enabled" : "disabled")); |
| break; |
| default: |
| log("Unhandled broadcast " + intent.getAction()); |
| } |
| } |
| }; |
| |
| private CellBroadcastHandler(Context context) { |
| this(CellBroadcastHandler.class.getSimpleName(), context, Looper.myLooper(), |
| new CbSendMessageCalculatorFactory(), null); |
| } |
| |
| /** |
| * Allows tests to inject new calculators |
| */ |
| @VisibleForTesting |
| public static class CbSendMessageCalculatorFactory { |
| public CbSendMessageCalculatorFactory() { |
| } |
| |
| /** |
| * Creates new calculator |
| * @param context context |
| * @param fences the geo fences to use in the calculator |
| * @return a new instance of the calculator |
| */ |
| public CbSendMessageCalculator createNew(@NonNull final Context context, |
| @NonNull final List<android.telephony.CbGeoUtils.Geometry> fences) { |
| return new CbSendMessageCalculator(context, fences); |
| } |
| } |
| |
| @VisibleForTesting |
| public CellBroadcastHandler(String debugTag, Context context, Looper looper, |
| @NonNull final CbSendMessageCalculatorFactory cbSendMessageCalculatorFactory, |
| @Nullable HandlerHelper handlerHelper) { |
| super(debugTag, context, looper); |
| |
| if (handlerHelper == null) { |
| // Would have preferred to not have handlerHelper has nullable and pass this through the |
| // default ctor. Had trouble doing this because getHander() can't be called until |
| // the type is fully constructed. |
| handlerHelper = new HandlerHelper(getHandler()); |
| } |
| mCbSendMessageCalculatorFactory = cbSendMessageCalculatorFactory; |
| mLocationRequester = new LocationRequester( |
| context, |
| (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE), |
| handlerHelper, getName()); |
| |
| // Adding GSM / CDMA service category mapping. |
| mServiceCategoryCrossRATMap = Stream.of(new Integer[][] { |
| // Presidential alert |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_PRESIDENTIAL_LEVEL, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_PRESIDENTIAL_LEVEL_ALERT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_PRESIDENTIAL_LEVEL_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_PRESIDENTIAL_LEVEL_ALERT}, |
| |
| // Extreme alert |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_IMMEDIATE_OBSERVED, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_EXTREME_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_IMMEDIATE_OBSERVED_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_EXTREME_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_IMMEDIATE_LIKELY, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_EXTREME_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_IMMEDIATE_LIKELY_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_EXTREME_THREAT}, |
| |
| // Severe alert |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_EXPECTED_OBSERVED, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_EXPECTED_OBSERVED_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_EXPECTED_LIKELY, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_EXTREME_EXPECTED_LIKELY_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_IMMEDIATE_OBSERVED, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_IMMEDIATE_OBSERVED_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_IMMEDIATE_LIKELY, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_IMMEDIATE_LIKELY_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_EXPECTED_OBSERVED, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_EXPECTED_OBSERVED_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_EXPECTED_LIKELY, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_SEVERE_EXPECTED_LIKELY_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_SEVERE_THREAT}, |
| |
| // Amber alert |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_CHILD_ABDUCTION_EMERGENCY, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_CHILD_ABDUCTION_EMERGENCY_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY}, |
| |
| // Monthly test alert |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_REQUIRED_MONTHLY_TEST, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_TEST_MESSAGE}, |
| { SmsCbConstants.MESSAGE_ID_CMAS_ALERT_REQUIRED_MONTHLY_TEST_LANGUAGE, |
| CdmaSmsCbProgramData.CATEGORY_CMAS_TEST_MESSAGE}, |
| }).collect(Collectors.toMap(data -> data[0], data -> data[1])); |
| |
| IntentFilter intentFilter = new IntentFilter(); |
| intentFilter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED); |
| if (IS_DEBUGGABLE) { |
| intentFilter.addAction(ACTION_DUPLICATE_DETECTION); |
| } |
| |
| mContext.registerReceiver(mReceiver, intentFilter); |
| } |
| |
| public void cleanup() { |
| if (DBG) log("CellBroadcastHandler cleanup"); |
| mContext.unregisterReceiver(mReceiver); |
| } |
| |
| /** |
| * Create a new CellBroadcastHandler. |
| * @param context the context to use for dispatching Intents |
| * @return the new handler |
| */ |
| public static CellBroadcastHandler makeCellBroadcastHandler(Context context) { |
| CellBroadcastHandler handler = new CellBroadcastHandler(context); |
| handler.start(); |
| return handler; |
| } |
| |
| /** |
| * Handle Cell Broadcast messages from {@code CdmaInboundSmsHandler}. |
| * 3GPP-format Cell Broadcast messages sent from radio are handled in the subclass. |
| * |
| * @param message the message to process |
| * @return true if need to wait for geo-fencing or an ordered broadcast was sent. |
| */ |
| @Override |
| @VisibleForTesting |
| public boolean handleSmsMessage(Message message) { |
| if (message.obj instanceof SmsCbMessage) { |
| if (!isDuplicate((SmsCbMessage) message.obj)) { |
| handleBroadcastSms((SmsCbMessage) message.obj); |
| return true; |
| } else { |
| CellBroadcastStatsLog.write(CellBroadcastStatsLog.CB_MESSAGE_FILTERED, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__TYPE__CDMA, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__FILTER__DUPLICATE_MESSAGE); |
| } |
| return false; |
| } else { |
| final String errorMessage = |
| "handleSmsMessage got object of type: " + message.obj.getClass().getName(); |
| loge(errorMessage); |
| CellBroadcastStatsLog.write(CellBroadcastStatsLog.CB_MESSAGE_ERROR, |
| CELL_BROADCAST_MESSAGE_ERROR__TYPE__UNEXPECTED_CDMA_MESSAGE_TYPE_FROM_FWK, |
| errorMessage); |
| return false; |
| } |
| } |
| |
| /** |
| * Get the maximum time for waiting location. |
| * |
| * @param message Cell broadcast message |
| * @return The maximum waiting time in second |
| */ |
| protected int getMaxLocationWaitingTime(SmsCbMessage message) { |
| int maximumTime = message.getMaximumWaitingDuration(); |
| if (maximumTime == SmsCbMessage.MAXIMUM_WAIT_TIME_NOT_SET) { |
| Resources res = getResources(message.getSubscriptionId()); |
| maximumTime = res.getInteger(R.integer.max_location_waiting_time); |
| } |
| return maximumTime; |
| } |
| |
| /** |
| * Dispatch a Cell Broadcast message to listeners. |
| * @param message the Cell Broadcast to broadcast |
| */ |
| protected void handleBroadcastSms(SmsCbMessage message) { |
| int slotIndex = message.getSlotIndex(); |
| |
| // TODO: Database inserting can be time consuming, therefore this should be changed to |
| // asynchronous. |
| ContentValues cv = message.getContentValues(); |
| Uri uri = mContext.getContentResolver().insert(CellBroadcasts.CONTENT_URI, cv); |
| |
| if (message.needGeoFencingCheck()) { |
| int maximumWaitingTime = getMaxLocationWaitingTime(message); |
| if (DBG) { |
| log("Requesting location for geo-fencing. serialNumber = " |
| + message.getSerialNumber() + ", maximumWaitingTime = " |
| + maximumWaitingTime); |
| } |
| |
| CbSendMessageCalculator calculator = |
| mCbSendMessageCalculatorFactory.createNew(mContext, message.getGeometries()); |
| requestLocationUpdate(new LocationUpdateCallback() { |
| @Override |
| public void onLocationUpdate(@NonNull LatLng location, |
| float accuracy) { |
| if (VDBG) { |
| logd("onLocationUpdate: location=" + location |
| + ", acc=" + accuracy + ". " + getMessageString(message)); |
| } |
| performGeoFencing(message, uri, calculator, location, slotIndex, |
| accuracy); |
| if (!isMessageInAmbiguousState(calculator)) { |
| cancelLocationRequest(); |
| } |
| } |
| |
| @Override |
| public void onLocationUnavailable() { |
| CellBroadcastHandler.this.onLocationUnavailable( |
| calculator, message, uri, slotIndex); |
| } |
| }, maximumWaitingTime); |
| } else { |
| if (DBG) { |
| log("Broadcast the message directly because no geo-fencing required, " |
| + " needGeoFencing = " + message.needGeoFencingCheck() + ". " |
| + getMessageString(message)); |
| } |
| broadcastMessage(message, uri, slotIndex); |
| } |
| } |
| |
| /** |
| * Returns true if the message calculator is in a non-ambiguous state. |
| * |
| * </b>Note:</b> NO_COORDINATES is considered ambiguous because we received no information |
| * in this case. |
| * @param calculator the message calculator |
| * @return whether or not the message is handled |
| */ |
| protected boolean isMessageInAmbiguousState(CbSendMessageCalculator calculator) { |
| return calculator.getAction() == SEND_MESSAGE_ACTION_AMBIGUOUS |
| || calculator.getAction() == SEND_MESSAGE_ACTION_NO_COORDINATES; |
| } |
| |
| /** |
| * Cancels the location request |
| */ |
| protected void cancelLocationRequest() { |
| this.mLocationRequester.cancel(); |
| } |
| |
| /** |
| * When location requester cannot send anymore updates, we look at the calculated action and |
| * determine whether or not we should send it. |
| * |
| * see: {@code CellBroadcastHandler.LocationUpdateCallback#onLocationUnavailable} for more info. |
| * |
| * @param calculator the send message calculator |
| * @param message the cell broadcast message received |
| * @param uri the message's uri |
| * @param slotIndex the slot |
| */ |
| protected void onLocationUnavailable(CbSendMessageCalculator calculator, SmsCbMessage message, |
| Uri uri, int slotIndex) { |
| @CbSendMessageCalculator.SendMessageAction int action = calculator.getAction(); |
| if (DBG) { |
| logd("onLocationUnavailable: action=" |
| + CbSendMessageCalculator.getActionString(action) + ". " |
| + getMessageString(message)); |
| } |
| |
| if (isMessageInAmbiguousState(calculator)) { |
| /* Case 1. If we reached the end of the location time out and we are still in an |
| ambiguous state or no coordinates state, we send the message. |
| Case 2. If we don't have permissions, then no location was received and the |
| calculator's action is NO_COORDINATES, which means we also send. */ |
| broadcastGeofenceMessage(message, uri, slotIndex, calculator); |
| } else if (action == SEND_MESSAGE_ACTION_DONT_SEND) { |
| geofenceMessageNotRequired(message); |
| } |
| } |
| |
| /** |
| * Check the location based on geographical scope defined in 3GPP TS 23.041 section 9.4.1.2.1. |
| * |
| * The Geographical Scope (GS) indicates the geographical area over which the Message Code |
| * is unique, and the display mode. The CBS message is not necessarily broadcast by all cells |
| * within the geographical area. When two CBS messages are received with identical Serial |
| * Numbers/Message Identifiers in two different cells, the Geographical Scope may be used to |
| * determine if the CBS messages are indeed identical. |
| * |
| * @param message The current message |
| * @param messageToCheck The older message in the database to be checked |
| * @return {@code true} if within the same area, otherwise {@code false}, which should be |
| * be considered as a new message. |
| */ |
| private boolean isSameLocation(SmsCbMessage message, |
| SmsCbMessage messageToCheck) { |
| if (message.getGeographicalScope() != messageToCheck.getGeographicalScope()) { |
| return false; |
| } |
| |
| // only cell wide (which means that if a message is displayed it is desirable that the |
| // message is removed from the screen when the UE selects the next cell and if any CBS |
| // message is received in the next cell it is to be regarded as "new"). |
| if (message.getGeographicalScope() == SmsCbMessage.GEOGRAPHICAL_SCOPE_CELL_WIDE_IMMEDIATE |
| || message.getGeographicalScope() == SmsCbMessage.GEOGRAPHICAL_SCOPE_CELL_WIDE) { |
| return message.getLocation().isInLocationArea(messageToCheck.getLocation()); |
| } |
| |
| // Service Area wide (which means that a CBS message with the same Message Code and Update |
| // Number may or may not be "new" in the next cell according to whether the next cell is |
| // in the same Service Area as the current cell) |
| if (message.getGeographicalScope() == SmsCbMessage.GEOGRAPHICAL_SCOPE_LOCATION_AREA_WIDE) { |
| if (!message.getLocation().getPlmn().equals(messageToCheck.getLocation().getPlmn())) { |
| return false; |
| } |
| |
| return message.getLocation().getLac() != -1 |
| && message.getLocation().getLac() == messageToCheck.getLocation().getLac(); |
| } |
| |
| // PLMN wide (which means that the Message Code and/or Update Number must change in the |
| // next cell, of the PLMN, for the CBS message to be "new". The CBS message is only relevant |
| // to the PLMN in which it is broadcast, so any change of PLMN (including a change to |
| // another PLMN which is an ePLMN) means the CBS message is "new") |
| if (message.getGeographicalScope() == SmsCbMessage.GEOGRAPHICAL_SCOPE_PLMN_WIDE) { |
| return !TextUtils.isEmpty(message.getLocation().getPlmn()) |
| && message.getLocation().getPlmn().equals( |
| messageToCheck.getLocation().getPlmn()); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Check if the message is a duplicate |
| * |
| * @param message Cell broadcast message |
| * @return {@code true} if this message is a duplicate |
| */ |
| @VisibleForTesting |
| public boolean isDuplicate(SmsCbMessage message) { |
| if (!mEnableDuplicateDetection) { |
| log("Duplicate detection was disabled for debugging purposes."); |
| return false; |
| } |
| |
| // Find the cell broadcast message identify by the message identifier and serial number |
| // and is not broadcasted. |
| String where = CellBroadcasts.RECEIVED_TIME + ">?"; |
| |
| Resources res = getResources(message.getSubscriptionId()); |
| |
| // Only consider cell broadcast messages received within certain period. |
| // By default it's 24 hours. |
| long expirationDuration = res.getInteger(R.integer.message_expiration_time); |
| long dupCheckTime = System.currentTimeMillis() - expirationDuration; |
| |
| // Some carriers require reset duplication detection after airplane mode or reboot. |
| if (res.getBoolean(R.bool.reset_on_power_cycle_or_airplane_mode)) { |
| dupCheckTime = Long.max(dupCheckTime, mLastAirplaneModeTime); |
| dupCheckTime = Long.max(dupCheckTime, |
| System.currentTimeMillis() - SystemClock.elapsedRealtime()); |
| } |
| |
| List<SmsCbMessage> cbMessages = new ArrayList<>(); |
| |
| try (Cursor cursor = mContext.getContentResolver().query(CellBroadcasts.CONTENT_URI, |
| CellBroadcastProvider.QUERY_COLUMNS, |
| where, |
| new String[] {Long.toString(dupCheckTime)}, |
| null)) { |
| if (cursor != null) { |
| while (cursor.moveToNext()) { |
| cbMessages.add(SmsCbMessage.createFromCursor(cursor)); |
| } |
| } |
| } |
| |
| boolean compareMessageBody = res.getBoolean(R.bool.duplicate_compare_body); |
| boolean compareServiceCategory = res.getBoolean(R.bool.duplicate_compare_service_category); |
| boolean crossSimDuplicateDetection = res.getBoolean(R.bool.cross_sim_duplicate_detection); |
| |
| log("Found " + cbMessages.size() + " messages since " |
| + DateFormat.getDateTimeInstance().format(dupCheckTime)); |
| log("compareMessageBody=" + compareMessageBody + ", compareServiceCategory=" |
| + compareServiceCategory + ", crossSimDuplicateDetection=" |
| + crossSimDuplicateDetection); |
| for (SmsCbMessage messageToCheck : cbMessages) { |
| // If messages are from different slots, then we only compare the message body. |
| if (VDBG) log("Checking the message " + messageToCheck); |
| if (crossSimDuplicateDetection |
| && message.getSlotIndex() != messageToCheck.getSlotIndex()) { |
| if (TextUtils.equals(message.getMessageBody(), messageToCheck.getMessageBody())) { |
| log("Duplicate message detected from different slot. " + message); |
| return true; |
| } |
| if (VDBG) log("Not from the same slot."); |
| } else { |
| // Check serial number if message is from the same carrier. |
| if (message.getSerialNumber() != messageToCheck.getSerialNumber()) { |
| if (VDBG) log("Serial number does not match."); |
| // Not a dup. Check next one. |
| continue; |
| } |
| |
| // ETWS primary / secondary should be treated differently. |
| if (message.isEtwsMessage() && messageToCheck.isEtwsMessage() |
| && message.getEtwsWarningInfo().isPrimary() |
| != messageToCheck.getEtwsWarningInfo().isPrimary()) { |
| if (VDBG) log("ETWS primary/secondary does not match."); |
| // Not a dup. Check next one. |
| continue; |
| } |
| |
| // Check if the message category is different. |
| if (compareServiceCategory |
| && message.getServiceCategory() != messageToCheck.getServiceCategory() |
| && !Objects.equals(mServiceCategoryCrossRATMap.get( |
| message.getServiceCategory()), messageToCheck.getServiceCategory()) |
| && !Objects.equals(mServiceCategoryCrossRATMap.get( |
| messageToCheck.getServiceCategory()), |
| message.getServiceCategory())) { |
| if (VDBG) log("Category does not match."); |
| // Not a dup. Check next one. |
| continue; |
| } |
| |
| // Check if the message location is different. Note this is only applicable to |
| // 3GPP format cell broadcast messages. |
| if (message.getMessageFormat() == SmsCbMessage.MESSAGE_FORMAT_3GPP |
| && messageToCheck.getMessageFormat() == SmsCbMessage.MESSAGE_FORMAT_3GPP |
| && !isSameLocation(message, messageToCheck)) { |
| if (VDBG) log("Location does not match."); |
| // Not a dup. Check next one. |
| continue; |
| } |
| |
| // Compare message body if needed. |
| if (!compareMessageBody || TextUtils.equals( |
| message.getMessageBody(), messageToCheck.getMessageBody())) { |
| log("Duplicate message detected. " + message); |
| return true; |
| } else { |
| if (VDBG) log("Body does not match."); |
| } |
| } |
| } |
| |
| log("Not a duplicate message. " + message); |
| return false; |
| } |
| |
| /** |
| * Perform a geo-fencing check for {@code message}. Broadcast the {@code message} if the |
| * {@code location} is inside the {@code broadcastArea}. |
| * @param message the message need to geo-fencing check |
| * @param uri the message's uri |
| * @param calculator the message calculator |
| * @param location current location |
| * @param slotIndex the index of the slot |
| * @param accuracy the accuracy of the coordinate given in meters |
| */ |
| @VisibleForTesting |
| public void performGeoFencing(SmsCbMessage message, Uri uri, |
| CbSendMessageCalculator calculator, LatLng location, int slotIndex, float accuracy) { |
| |
| logd(calculator.toString() + ", current action=" |
| + CbSendMessageCalculator.getActionString(calculator.getAction())); |
| |
| if (calculator.getAction() == SEND_MESSAGE_ACTION_SENT) { |
| if (VDBG) { |
| logd("performGeoFencing:" + getMessageString(message)); |
| } |
| return; |
| } |
| |
| if (uri != null) { |
| ContentValues cv = new ContentValues(); |
| cv.put(CellBroadcasts.LOCATION_CHECK_TIME, System.currentTimeMillis()); |
| mContext.getContentResolver().update(CellBroadcasts.CONTENT_URI, cv, |
| CellBroadcasts._ID + "=?", new String[] {uri.getLastPathSegment()}); |
| } |
| |
| |
| calculator.addCoordinate(location, accuracy); |
| |
| if (VDBG) { |
| logd("Device location new action = " |
| + CbSendMessageCalculator.getActionString(calculator.getAction()) |
| + ", threshold = " + calculator.getThreshold() |
| + ", geos=" + CbGeoUtils.encodeGeometriesToString(calculator.getFences()) |
| + ". " + getMessageString(message)); |
| } |
| |
| if (calculator.getAction() == SEND_MESSAGE_ACTION_SEND) { |
| broadcastGeofenceMessage(message, uri, slotIndex, calculator); |
| return; |
| } |
| } |
| |
| protected void geofenceMessageNotRequired(SmsCbMessage message) { |
| if (message.getMessageFormat() == SmsCbMessage.MESSAGE_FORMAT_3GPP) { |
| CellBroadcastStatsLog.write(CellBroadcastStatsLog.CB_MESSAGE_FILTERED, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__TYPE__GSM, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__FILTER__GEOFENCED_MESSAGE); |
| } else if (message.getMessageFormat() == SmsCbMessage.MESSAGE_FORMAT_3GPP2) { |
| CellBroadcastStatsLog.write(CellBroadcastStatsLog.CB_MESSAGE_FILTERED, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__TYPE__CDMA, |
| CellBroadcastStatsLog.CELL_BROADCAST_MESSAGE_FILTERED__FILTER__GEOFENCED_MESSAGE); |
| } |
| |
| sendMessage(EVENT_BROADCAST_NOT_REQUIRED); |
| } |
| |
| /** |
| * Requests a stream of updates for {@code maximumWaitTimeSec} seconds. |
| * @param callback the callback used to communicate back to the caller |
| * @param maximumWaitTimeSec the maximum wait time of this request. If location is not updated |
| * within the maximum wait time, {@code callback#onLocationUnavailable()} will be called. |
| */ |
| protected void requestLocationUpdate(LocationUpdateCallback callback, int maximumWaitTimeSec) { |
| mLocationRequester.requestLocationUpdate(callback, maximumWaitTimeSec); |
| } |
| |
| /** |
| * Get the subscription ID for a phone ID, or INVALID_SUBSCRIPTION_ID if the phone does not |
| * have an active sub |
| * @param phoneId the phoneId to use |
| * @return the associated sub id |
| */ |
| protected static int getSubIdForPhone(Context context, int phoneId) { |
| SubscriptionManager subMan = |
| (SubscriptionManager) context.getSystemService( |
| Context.TELEPHONY_SUBSCRIPTION_SERVICE); |
| int[] subIds = subMan.getSubscriptionIds(phoneId); |
| if (subIds != null) { |
| return subIds[0]; |
| } else { |
| return SubscriptionManager.INVALID_SUBSCRIPTION_ID; |
| } |
| } |
| |
| /** |
| * Put the phone ID and sub ID into an intent as extras. |
| */ |
| public static void putPhoneIdAndSubIdExtra(Context context, Intent intent, int phoneId) { |
| int subId = getSubIdForPhone(context, phoneId); |
| if (subId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) { |
| intent.putExtra("subscription", subId); |
| intent.putExtra(SubscriptionManager.EXTRA_SUBSCRIPTION_INDEX, subId); |
| } |
| intent.putExtra("phone", phoneId); |
| intent.putExtra(SubscriptionManager.EXTRA_SLOT_INDEX, phoneId); |
| } |
| |
| /** |
| * Call when dealing with messages that are checked against a geofence. |
| * |
| * @param message the message being broadcast |
| * @param messageUri the message uri |
| * @param slotIndex the slot index |
| * @param calculator the messages send message calculator |
| */ |
| protected void broadcastGeofenceMessage(@NonNull SmsCbMessage message, @Nullable Uri messageUri, |
| int slotIndex, CbSendMessageCalculator calculator) { |
| // Check that the message wasn't already SENT |
| if (calculator.getAction() == CbSendMessageCalculator.SEND_MESSAGE_ACTION_SENT) { |
| return; |
| } |
| |
| if (VDBG) { |
| logd("broadcastGeofenceMessage: mark as sent. " + getMessageString(message)); |
| } |
| // Mark the message as SENT |
| calculator.markAsSent(); |
| |
| // Broadcast the message |
| broadcastMessage(message, messageUri, slotIndex); |
| } |
| |
| /** |
| * Broadcast the {@code message} to the applications. |
| * @param message a message need to broadcast |
| * @param messageUri message's uri |
| */ |
| protected void broadcastMessage(@NonNull SmsCbMessage message, @Nullable Uri messageUri, |
| int slotIndex) { |
| String msg; |
| Intent intent; |
| if (VDBG) { |
| logd("broadcastMessage: " + getMessageString(message)); |
| } |
| |
| if (message.isEmergencyMessage()) { |
| msg = "Dispatching emergency SMS CB, SmsCbMessage is: " + message; |
| log(msg); |
| mLocalLog.log(msg); |
| intent = new Intent(Telephony.Sms.Intents.ACTION_SMS_EMERGENCY_CB_RECEIVED); |
| //Emergency alerts need to be delivered with high priority |
| intent.addFlags(Intent.FLAG_RECEIVER_FOREGROUND); |
| |
| intent.putExtra(EXTRA_MESSAGE, message); |
| putPhoneIdAndSubIdExtra(mContext, intent, slotIndex); |
| |
| if (IS_DEBUGGABLE) { |
| // Send additional broadcast intent to the specified package. This is only for sl4a |
| // automation tests. |
| String[] testPkgs = mContext.getResources().getStringArray( |
| R.array.test_cell_broadcast_receiver_packages); |
| if (testPkgs != null) { |
| Intent additionalIntent = new Intent(intent); |
| for (String pkg : testPkgs) { |
| additionalIntent.setPackage(pkg); |
| mContext.createContextAsUser(UserHandle.ALL, 0).sendOrderedBroadcast( |
| intent, null, (Bundle) null, null, getHandler(), |
| Activity.RESULT_OK, null, null); |
| |
| } |
| } |
| } |
| |
| List<String> pkgs = new ArrayList<>(); |
| pkgs.add(getDefaultCBRPackageName(mContext, intent)); |
| pkgs.addAll(Arrays.asList(mContext.getResources().getStringArray( |
| R.array.additional_cell_broadcast_receiver_packages))); |
| if (pkgs != null) { |
| mReceiverCount.addAndGet(pkgs.size()); |
| for (String pkg : pkgs) { |
| // Explicitly send the intent to all the configured cell broadcast receivers. |
| intent.setPackage(pkg); |
| mContext.createContextAsUser(UserHandle.ALL, 0).sendOrderedBroadcast( |
| intent, null, (Bundle) null, mOrderedBroadcastReceiver, getHandler(), |
| Activity.RESULT_OK, null, null); |
| } |
| } |
| } else { |
| msg = "Dispatching SMS CB, SmsCbMessage is: " + message; |
| log(msg); |
| mLocalLog.log(msg); |
| // Send implicit intent since there are various 3rd party carrier apps listen to |
| // this intent. |
| |
| mReceiverCount.incrementAndGet(); |
| CellBroadcastIntents.sendSmsCbReceivedBroadcast( |
| mContext, UserHandle.ALL, message, mOrderedBroadcastReceiver, getHandler(), |
| Activity.RESULT_OK, slotIndex); |
| } |
| |
| if (messageUri != null) { |
| ContentValues cv = new ContentValues(); |
| cv.put(CellBroadcasts.MESSAGE_BROADCASTED, 1); |
| mContext.getContentResolver().update(CellBroadcasts.CONTENT_URI, cv, |
| CellBroadcasts._ID + "=?", new String[] {messageUri.getLastPathSegment()}); |
| } |
| } |
| |
| /** |
| * Checks if the app's path starts with CB_APEX_PATH |
| */ |
| private static boolean isAppInCBApex(ApplicationInfo appInfo) { |
| return appInfo.sourceDir.startsWith(CB_APEX_PATH); |
| } |
| |
| /** |
| * Find the name of the default CBR package. The criteria is that it belongs to CB apex and |
| * handles the given intent. |
| */ |
| static String getDefaultCBRPackageName(Context context, Intent intent) { |
| PackageManager packageManager = context.getPackageManager(); |
| List<ResolveInfo> cbrPackages = packageManager.queryBroadcastReceivers(intent, 0); |
| |
| // remove apps that don't live in the CellBroadcast apex |
| cbrPackages.removeIf(info -> |
| !isAppInCBApex(info.activityInfo.applicationInfo)); |
| |
| if (cbrPackages.isEmpty()) { |
| Log.e(TAG, "getCBRPackageNames: no package found"); |
| return null; |
| } |
| |
| if (cbrPackages.size() > 1) { |
| // multiple apps found, log an error but continue |
| Log.e(TAG, "Found > 1 APK in CB apex that can resolve " + intent.getAction() + ": " |
| + cbrPackages.stream() |
| .map(info -> info.activityInfo.applicationInfo.packageName) |
| .collect(Collectors.joining(", "))); |
| } |
| |
| // Assume the first ResolveInfo is the one we're looking for |
| ResolveInfo info = cbrPackages.get(0); |
| return info.activityInfo.applicationInfo.packageName; |
| } |
| |
| /** |
| * Get the device resource based on SIM |
| * |
| * @param subId Subscription index |
| * |
| * @return The resource |
| */ |
| public @NonNull Resources getResources(int subId) { |
| if (subId == SubscriptionManager.DEFAULT_SUBSCRIPTION_ID |
| || !SubscriptionManager.isValidSubscriptionId(subId)) { |
| return mContext.getResources(); |
| } |
| |
| if (mResourcesCache.containsKey(subId)) { |
| return mResourcesCache.get(subId); |
| } |
| |
| Resources res = SubscriptionManager.getResourcesForSubId(mContext, subId); |
| mResourcesCache.put(subId, res); |
| |
| return res; |
| } |
| |
| @Override |
| public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| pw.println("CellBroadcastHandler:"); |
| mLocalLog.dump(fd, pw, args); |
| pw.flush(); |
| } |
| |
| /** The callback interface of a location request. */ |
| public interface LocationUpdateCallback { |
| /** |
| * Called when the location update is available. |
| * @param location a location in (latitude, longitude) format. |
| * @param accuracy the accuracy of the location given from location manager. Given in |
| * meters. |
| */ |
| void onLocationUpdate(@NonNull LatLng location, float accuracy); |
| |
| /** |
| * This is called in the following scenarios: |
| * 1. The max time limit of the LocationRequester was reached, and consequently, |
| * no more location updates will be sent. |
| * 2. The service does not have permission to request a location update. |
| * 3. The LocationRequester was explicitly cancelled. |
| */ |
| void onLocationUnavailable(); |
| } |
| |
| private static final class LocationRequester { |
| /** |
| * Fused location provider, which means GPS plus network based providers (cell, wifi, etc..) |
| */ |
| //TODO: Should make LocationManager.FUSED_PROVIDER system API in S. |
| private static final String FUSED_PROVIDER = "fused"; |
| |
| /** |
| * The interval in which location requests will be sent. |
| * see more: <code>LocationRequest#setInterval</code> |
| */ |
| private static final long LOCATION_REQUEST_INTERVAL_MILLIS = 1000; |
| |
| private final LocationManager mLocationManager; |
| private final List<LocationUpdateCallback> mCallbacks; |
| private final HandlerHelper mHandlerHelper; |
| private final Context mContext; |
| |
| private final LocationListener mLocationListener; |
| private boolean mLocationUpdateInProgress; |
| private final Runnable mLocationUnavailable; |
| private final String mDebugTag; |
| |
| LocationRequester(Context context, LocationManager locationManager, |
| HandlerHelper handlerHelper, String debugTag) { |
| mLocationManager = locationManager; |
| mCallbacks = new ArrayList<>(); |
| mContext = context; |
| mHandlerHelper = handlerHelper; |
| mLocationUpdateInProgress = false; |
| mLocationUnavailable = this::onLocationUnavailable; |
| |
| // Location request did not cancel itself when using this::onLocationListener |
| mLocationListener = this::onLocationUpdate; |
| mDebugTag = debugTag; |
| } |
| |
| /** |
| * Requests a stream of updates for {@code maximumWaitTimeSec} seconds. |
| * @param callback the callback used to communicate back to the caller |
| * @param maximumWaitTimeSec the maximum wait time of this request. If location is not |
| * updated within the maximum wait time, |
| * {@code callback#onLocationUnavailable()} will be called. |
| */ |
| void requestLocationUpdate(@NonNull LocationUpdateCallback callback, |
| int maximumWaitTimeSec) { |
| mHandlerHelper.post(() -> requestLocationUpdateInternal(callback, maximumWaitTimeSec)); |
| } |
| |
| private void onLocationUpdate(@NonNull Location location) { |
| if (location == null) { |
| /* onLocationUpdate should neverreceive a null location, but, covering all of our |
| bases here. */ |
| Log.wtf(mDebugTag, "Location is never supposed to be null"); |
| return; |
| } |
| |
| LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); |
| float accuracy = location.getAccuracy(); |
| if (DBG) { |
| Log.d(mDebugTag, "onLocationUpdate: received location update"); |
| } |
| |
| for (LocationUpdateCallback callback : mCallbacks) { |
| callback.onLocationUpdate(latLng, accuracy); |
| } |
| } |
| |
| private void onLocationUnavailable() { |
| Log.d(mDebugTag, "onLocationUnavailable: called"); |
| locationRequesterCycleComplete(); |
| } |
| |
| /* This should only be called if all of the messages are handled. */ |
| public void cancel() { |
| if (mLocationUpdateInProgress) { |
| Log.d(mDebugTag, "cancel: location update in progress"); |
| mHandlerHelper.removeCallbacks(mLocationUnavailable); |
| locationRequesterCycleComplete(); |
| } else { |
| Log.d(mDebugTag, "cancel: location update NOT in progress"); |
| } |
| } |
| |
| private void locationRequesterCycleComplete() { |
| try { |
| for (LocationUpdateCallback callback : mCallbacks) { |
| callback.onLocationUnavailable(); |
| } |
| } finally { |
| mLocationManager.removeUpdates(mLocationListener); |
| // Reset the state of location requester for the next request |
| mCallbacks.clear(); |
| mLocationUpdateInProgress = false; |
| } |
| } |
| |
| private void requestLocationUpdateInternal(@NonNull LocationUpdateCallback callback, |
| int maximumWaitTimeS) { |
| if (DBG) Log.d(mDebugTag, "requestLocationUpdate"); |
| if (!hasPermission(ACCESS_FINE_LOCATION) && !hasPermission(ACCESS_COARSE_LOCATION)) { |
| if (DBG) { |
| Log.e(mDebugTag, |
| "Can't request location update because of no location permission"); |
| } |
| callback.onLocationUnavailable(); |
| return; |
| } |
| |
| if (!mLocationUpdateInProgress) { |
| try { |
| /* We will continue to send updates until the location timeout is reached. The |
| location timeout case is handled through onLocationUnavailable. */ |
| LocationRequest request = LocationRequest.create() |
| .setProvider(FUSED_PROVIDER) |
| .setQuality(LocationRequest.ACCURACY_FINE) |
| .setInterval(LOCATION_REQUEST_INTERVAL_MILLIS); |
| if (DBG) { |
| Log.d(mDebugTag, "Location request=" + request); |
| } |
| mLocationManager.requestLocationUpdates(request, |
| new HandlerExecutor(mHandlerHelper.getHandler()), |
| mLocationListener); |
| |
| // TODO: Remove the following workaround in S. We need to enforce the timeout |
| // before location manager adds the support for timeout value which is less |
| // than 30 seconds. After that we can rely on location manager's timeout |
| // mechanism. |
| mHandlerHelper.postDelayed(mLocationUnavailable, |
| TimeUnit.SECONDS.toMillis(maximumWaitTimeS)); |
| } catch (IllegalArgumentException e) { |
| Log.e(mDebugTag, "Cannot get current location. e=" + e); |
| callback.onLocationUnavailable(); |
| return; |
| } |
| mLocationUpdateInProgress = true; |
| } |
| mCallbacks.add(callback); |
| } |
| |
| private boolean hasPermission(String permission) { |
| // TODO: remove the check. This will always return true because cell broadcast service |
| // is running under the UID Process.NETWORK_STACK_UID, which is below 10000. It will be |
| // automatically granted with all runtime permissions. |
| return mContext.checkPermission(permission, Process.myPid(), Process.myUid()) |
| == PackageManager.PERMISSION_GRANTED; |
| } |
| } |
| |
| /** |
| * Provides message identifiers that are helpful when logging messages. |
| * |
| * @param message the message to log |
| * @return a helpful message |
| */ |
| protected static String getMessageString(SmsCbMessage message) { |
| return "msg=(" |
| + message.getServiceCategory() + "," |
| + message.getSerialNumber() + ")"; |
| } |
| |
| |
| /** |
| * Wraps the {@code Handler} in order to mock the methods. |
| */ |
| @VisibleForTesting |
| public static class HandlerHelper { |
| |
| private final Handler mHandler; |
| |
| public HandlerHelper(@NonNull final Handler handler) { |
| mHandler = handler; |
| } |
| |
| /** |
| * Posts {@code r} to {@code handler} with a delay of {@code delayMillis} |
| * |
| * @param r the runnable callback |
| * @param delayMillis the number of milliseconds to delay |
| */ |
| public void postDelayed(Runnable r, long delayMillis) { |
| mHandler.postDelayed(r, delayMillis); |
| } |
| |
| /** |
| * Posts {@code r} to the underlying handler |
| * |
| * @param r the runnable callback |
| */ |
| public void post(Runnable r) { |
| mHandler.post(r); |
| } |
| |
| /** |
| * Gets the underlying handler |
| * @return the handler |
| */ |
| public Handler getHandler() { |
| return mHandler; |
| } |
| |
| /** |
| * Remove any pending posts of Runnable r that are in the message queue. |
| */ |
| public void removeCallbacks(Runnable r) { |
| mHandler.removeCallbacks(r); |
| } |
| } |
| } |
