1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* Copyright (C) 2011 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.cellbroadcastreceiver;
import android.app.IntentService;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.SystemProperties;
import android.preference.PreferenceManager;
import android.telephony.CellBroadcastMessage;
import android.telephony.SmsManager;
import android.text.TextUtils;
import android.util.Log;
import com.android.internal.telephony.gsm.SmsCbConstants;
import static com.android.cellbroadcastreceiver.CellBroadcastReceiver.DBG;
/**
* This service manages enabling and disabling ranges of message identifiers
* that the radio should listen for. It operates independently of the other
* services and runs at boot time and after exiting airplane mode.
*
* Note that the entire range of emergency channels is enabled. Test messages
* and lower priority broadcasts are filtered out in CellBroadcastAlertService
* if the user has not enabled them in settings.
*
* TODO: add notification to re-enable channels after a radio reset.
*/
public class CellBroadcastConfigService extends IntentService {
private static final String TAG = "CellBroadcastConfigService";
static final String ACTION_ENABLE_CHANNELS = "ACTION_ENABLE_CHANNELS";
public CellBroadcastConfigService() {
super(TAG); // use class name for worker thread name
}
private static void setChannelRange(SmsManager manager, String ranges, boolean enable) {
if (DBG)log("setChannelRange: " + ranges);
try {
for (String channelRange : ranges.split(",")) {
int dashIndex = channelRange.indexOf('-');
if (dashIndex != -1) {
int startId = Integer.decode(channelRange.substring(0, dashIndex).trim());
int endId = Integer.decode(channelRange.substring(dashIndex + 1).trim());
if (enable) {
if (DBG) log("enabling emergency IDs " + startId + '-' + endId);
manager.enableCellBroadcastRange(startId, endId);
} else {
if (DBG) log("disabling emergency IDs " + startId + '-' + endId);
manager.disableCellBroadcastRange(startId, endId);
}
} else {
int messageId = Integer.decode(channelRange.trim());
if (enable) {
if (DBG) log("enabling emergency message ID " + messageId);
manager.enableCellBroadcast(messageId);
} else {
if (DBG) log("disabling emergency message ID " + messageId);
manager.disableCellBroadcast(messageId);
}
}
}
} catch (NumberFormatException e) {
Log.e(TAG, "Number Format Exception parsing emergency channel range", e);
}
// Make sure CMAS Presidential is enabled (See 3GPP TS 22.268 Section 6.2).
if (DBG) log("setChannelRange: enabling CMAS Presidential");
manager.enableCellBroadcast(SmsCbConstants.MESSAGE_ID_CMAS_ALERT_PRESIDENTIAL_LEVEL);
}
/**
* Returns true if this is a standard or operator-defined emergency alert message.
* This includes all ETWS and CMAS alerts, except for AMBER alerts.
* @param message the message to test
* @return true if the message is an emergency alert; false otherwise
*/
static boolean isEmergencyAlertMessage(CellBroadcastMessage message) {
if (message.isEmergencyAlertMessage()) {
return true;
}
// Check for system property defining the emergency channel ranges to enable
String emergencyIdRange = SystemProperties.get("ro.cellbroadcast.emergencyids");
if (TextUtils.isEmpty(emergencyIdRange)) {
return false;
}
try {
int messageId = message.getServiceCategory();
for (String channelRange : emergencyIdRange.split(",")) {
int dashIndex = channelRange.indexOf('-');
if (dashIndex != -1) {
int startId = Integer.decode(channelRange.substring(0, dashIndex).trim());
int endId = Integer.decode(channelRange.substring(dashIndex + 1).trim());
if (messageId >= startId && messageId <= endId) {
return true;
}
} else {
int emergencyMessageId = Integer.decode(channelRange.trim());
if (emergencyMessageId == messageId) {
return true;
}
}
}
} catch (NumberFormatException e) {
Log.e(TAG, "Number Format Exception parsing emergency channel range", e);
}
return false;
}
@Override
protected void onHandleIntent(Intent intent) {
if (ACTION_ENABLE_CHANNELS.equals(intent.getAction())) {
try {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
Resources res = getResources();
// Check for system property defining the emergency channel ranges to enable
String emergencyIdRange = SystemProperties.get("ro.cellbroadcast.emergencyids");
boolean enableEmergencyAlerts = prefs.getBoolean(
CellBroadcastSettings.KEY_ENABLE_EMERGENCY_ALERTS, true);
boolean enableChannel50Alerts = res.getBoolean(R.bool.show_brazil_settings) &&
prefs.getBoolean(CellBroadcastSettings.KEY_ENABLE_CHANNEL_50_ALERTS, true);
SmsManager manager = SmsManager.getDefault();
if (enableEmergencyAlerts) {
if (DBG) log("enabling emergency cell broadcast channels");
if (!TextUtils.isEmpty(emergencyIdRange)) {
setChannelRange(manager, emergencyIdRange, true);
} else {
// No emergency channel system property, enable all emergency channels
manager.enableCellBroadcastRange(
SmsCbConstants.MESSAGE_ID_PWS_FIRST_IDENTIFIER,
SmsCbConstants.MESSAGE_ID_PWS_LAST_IDENTIFIER);
// CMAS Presidential must be on (See 3GPP TS 22.268 Section 6.2).
manager.enableCellBroadcast(
SmsCbConstants.MESSAGE_ID_CMAS_ALERT_PRESIDENTIAL_LEVEL);
}
if (DBG) log("enabled emergency cell broadcast channels");
} else {
// we may have enabled these channels previously, so try to disable them
if (DBG) log("disabling emergency cell broadcast channels");
if (!TextUtils.isEmpty(emergencyIdRange)) {
setChannelRange(manager, emergencyIdRange, false);
} else {
// No emergency channel system property, disable all emergency channels
// except for CMAS Presidential (See 3GPP TS 22.268 Section 6.2)
manager.disableCellBroadcastRange(
SmsCbConstants.MESSAGE_ID_PWS_FIRST_IDENTIFIER,
SmsCbConstants.MESSAGE_ID_PWS_LAST_IDENTIFIER);
manager.enableCellBroadcast(
SmsCbConstants.MESSAGE_ID_CMAS_ALERT_PRESIDENTIAL_LEVEL);
}
if (DBG) log("disabled emergency cell broadcast channels");
}
if (enableChannel50Alerts) {
if (DBG) log("enabling cell broadcast channel 50");
manager.enableCellBroadcast(50);
if (DBG) log("enabled cell broadcast channel 50");
} else {
if (DBG) log("disabling cell broadcast channel 50");
manager.disableCellBroadcast(50);
if (DBG) log("disabled cell broadcast channel 50");
}
} catch (Exception ex) {
Log.e(TAG, "exception enabling cell broadcast channels", ex);
}
}
}
private static void log(String msg) {
Log.d(TAG, msg);
}
}
|
