CellBroadcastReceiver.java revision a028d57ae657c29873abd1ba6969f6e4ce835eba 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.cellbroadcastreceiver;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.SharedPreferences;
23import android.os.RemoteException;
24import android.os.ServiceManager;
25import android.preference.PreferenceManager;
26import android.provider.Telephony;
27import android.telephony.TelephonyManager;
28import android.telephony.cdma.CdmaSmsCbProgramData;
29import android.util.Log;
30
31import com.android.internal.telephony.ITelephony;
32import com.android.internal.telephony.cdma.sms.SmsEnvelope;
33
34public class CellBroadcastReceiver extends BroadcastReceiver {
35    private static final String TAG = "CellBroadcastReceiver";
36    static final boolean DBG = true;    // STOPSHIP: change to false before ship
37
38    @Override
39    public void onReceive(Context context, Intent intent) {
40        onReceiveWithPrivilege(context, intent, false);
41    }
42
43    protected void onReceiveWithPrivilege(Context context, Intent intent, boolean privileged) {
44        if (DBG) log("onReceive " + intent);
45
46        String action = intent.getAction();
47
48        if (Intent.ACTION_BOOT_COMPLETED.equals(action)) {
49            startConfigService(context);
50        } else if (Intent.ACTION_AIRPLANE_MODE_CHANGED.equals(action)) {
51            boolean airplaneModeOn = intent.getBooleanExtra("state", false);
52            if (DBG) log("airplaneModeOn: " + airplaneModeOn);
53            if (!airplaneModeOn) {
54                startConfigService(context);
55            }
56        } else if (Telephony.Sms.Intents.SMS_EMERGENCY_CB_RECEIVED_ACTION.equals(action) ||
57                Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION.equals(action)) {
58            // If 'privileged' is false, it means that the intent was delivered to the base
59            // no-permissions receiver class.  If we get an SMS_CB_RECEIVED message that way, it
60            // means someone has tried to spoof the message by delivering it outside the normal
61            // permission-checked route, so we just ignore it.
62            if (privileged) {
63                intent.setClass(context, CellBroadcastAlertService.class);
64                context.startService(intent);
65            } else {
66                loge("ignoring unprivileged action received " + action);
67            }
68        } else if (Telephony.Sms.Intents.SMS_SERVICE_CATEGORY_PROGRAM_DATA_RECEIVED_ACTION
69                .equals(action)) {
70            if (privileged) {
71                CdmaSmsCbProgramData[] programDataList = (CdmaSmsCbProgramData[])
72                        intent.getParcelableArrayExtra("program_data_list");
73                if (programDataList != null) {
74                    handleCdmaSmsCbProgramData(context, programDataList);
75                } else {
76                    loge("SCPD intent received with no program_data_list");
77                }
78            } else {
79                loge("ignoring unprivileged action received " + action);
80            }
81        } else {
82            Log.w(TAG, "onReceive() unexpected action " + action);
83        }
84    }
85
86    /**
87     * Handle Service Category Program Data message.
88     * TODO: Send Service Category Program Results response message to sender
89     *
90     * @param context
91     * @param programDataList
92     */
93    private void handleCdmaSmsCbProgramData(Context context,
94            CdmaSmsCbProgramData[] programDataList) {
95        for (CdmaSmsCbProgramData programData : programDataList) {
96            switch (programData.getOperation()) {
97                case CdmaSmsCbProgramData.OPERATION_ADD_CATEGORY:
98                    tryCdmaSetCategory(context, programData.getCategory(), true);
99                    break;
100
101                case CdmaSmsCbProgramData.OPERATION_DELETE_CATEGORY:
102                    tryCdmaSetCategory(context, programData.getCategory(), false);
103                    break;
104
105                case CdmaSmsCbProgramData.OPERATION_CLEAR_CATEGORIES:
106                    tryCdmaSetCategory(context,
107                            SmsEnvelope.SERVICE_CATEGORY_CMAS_EXTREME_THREAT, false);
108                    tryCdmaSetCategory(context,
109                            SmsEnvelope.SERVICE_CATEGORY_CMAS_SEVERE_THREAT, false);
110                    tryCdmaSetCategory(context,
111                            SmsEnvelope.SERVICE_CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY, false);
112                    tryCdmaSetCategory(context,
113                            SmsEnvelope.SERVICE_CATEGORY_CMAS_TEST_MESSAGE, false);
114                    break;
115
116                default:
117                    loge("Ignoring unknown SCPD operation " + programData.getOperation());
118            }
119        }
120    }
121
122    private void tryCdmaSetCategory(Context context, int category, boolean enable) {
123        SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
124
125        switch (category) {
126            case SmsEnvelope.SERVICE_CATEGORY_CMAS_EXTREME_THREAT:
127                sharedPrefs.edit().putBoolean(
128                        CellBroadcastSettings.KEY_ENABLE_CMAS_EXTREME_THREAT_ALERTS, enable)
129                        .apply();
130                break;
131
132            case SmsEnvelope.SERVICE_CATEGORY_CMAS_SEVERE_THREAT:
133                sharedPrefs.edit().putBoolean(
134                        CellBroadcastSettings.KEY_ENABLE_CMAS_SEVERE_THREAT_ALERTS, enable)
135                        .apply();
136                break;
137
138            case SmsEnvelope.SERVICE_CATEGORY_CMAS_CHILD_ABDUCTION_EMERGENCY:
139                sharedPrefs.edit().putBoolean(
140                        CellBroadcastSettings.KEY_ENABLE_CMAS_AMBER_ALERTS, enable).apply();
141                break;
142
143            case SmsEnvelope.SERVICE_CATEGORY_CMAS_TEST_MESSAGE:
144                sharedPrefs.edit().putBoolean(
145                        CellBroadcastSettings.KEY_ENABLE_CMAS_TEST_ALERTS, enable).apply();
146                break;
147
148            default:
149                Log.w(TAG, "Ignoring SCPD command to " + (enable ? "enable" : "disable")
150                        + " alerts in category " + category);
151        }
152    }
153
154    /**
155     * Tell {@link CellBroadcastConfigService} to enable the CB channels.
156     * @param context the broadcast receiver context
157     */
158    static void startConfigService(Context context) {
159        Intent serviceIntent = new Intent(CellBroadcastConfigService.ACTION_ENABLE_CHANNELS,
160                null, context, CellBroadcastConfigService.class);
161        context.startService(serviceIntent);
162    }
163
164    /**
165     * @return true if the phone is a CDMA phone type
166     */
167    static boolean phoneIsCdma() {
168        boolean isCdma = false;
169        try {
170            ITelephony phone = ITelephony.Stub.asInterface(ServiceManager.checkService("phone"));
171            if (phone != null) {
172                isCdma = (phone.getActivePhoneType() == TelephonyManager.PHONE_TYPE_CDMA);
173            }
174        } catch (RemoteException e) {
175            Log.w(TAG, "phone.getActivePhoneType() failed", e);
176        }
177        return isCdma;
178    }
179
180    private static void log(String msg) {
181        Log.d(TAG, msg);
182    }
183
184    private static void loge(String msg) {
185        Log.e(TAG, msg);
186    }
187}
188