The state machine starts in {@link IdleState} state. When the {@link SMSDispatcher} receives a * new SMS from the radio, it calls {@link #dispatchNormalMessage}, * which sends a message to the state machine, causing the wakelock to be acquired in * {@link #haltedProcessMessage}, which transitions to {@link DeliveringState} state, where the message * is saved to the raw table, then acknowledged via the {@link SMSDispatcher} which called us. * *
After saving the SMS, if the message is complete (either single-part or the final segment
* of a multi-part SMS), we broadcast the completed PDUs as an ordered broadcast, then transition to
* {@link WaitingState} state to wait for the broadcast to complete. When the local
* {@link BroadcastReceiver} is called with the result, it sends {@link #EVENT_BROADCAST_COMPLETE}
* to the state machine, causing us to either broadcast the next pending message (if one has
* arrived while waiting for the broadcast to complete), or to transition back to the halted state
* after all messages are processed. Then the wakelock is released and we wait for the next SMS.
*/
public abstract class InboundSmsHandler extends StateMachine {
protected static final boolean DBG = true;
private static final boolean VDBG = false; // STOPSHIP if true, logs user data
/** Query projection for checking for duplicate message segments. */
private static final String[] PDU_PROJECTION = {
"pdu"
};
/** Query projection for combining concatenated message segments. */
private static final String[] PDU_SEQUENCE_PORT_PROJECTION = {
"pdu",
"sequence",
"destination_port"
};
static final int PDU_COLUMN = 0;
static final int SEQUENCE_COLUMN = 1;
static final int DESTINATION_PORT_COLUMN = 2;
static final int DATE_COLUMN = 3;
static final int REFERENCE_NUMBER_COLUMN = 4;
static final int COUNT_COLUMN = 5;
static final int ADDRESS_COLUMN = 6;
static final int ID_COLUMN = 7;
static final String SELECT_BY_ID = "_id=?";
static final String SELECT_BY_REFERENCE = "address=? AND reference_number=? AND count=?";
/** New SMS received as an AsyncResult. */
public static final int EVENT_NEW_SMS = 1;
/** Message type containing a {@link InboundSmsTracker} ready to broadcast to listeners. */
static final int EVENT_BROADCAST_SMS = 2;
/** Message from resultReceiver notifying {@link WaitingState} of a completed broadcast. */
static final int EVENT_BROADCAST_COMPLETE = 3;
/** Sent on exit from {@link WaitingState} to return to idle after sending all broadcasts. */
static final int EVENT_RETURN_TO_IDLE = 4;
/** Release wakelock after a short timeout when returning to idle state. */
static final int EVENT_RELEASE_WAKELOCK = 5;
/** Sent by {@link SmsBroadcastUndelivered} after cleaning the raw table. */
static final int EVENT_START_ACCEPTING_SMS = 6;
/** Update phone object */
static final int EVENT_UPDATE_PHONE_OBJECT = 7;
/** New SMS received as an AsyncResult. */
public static final int EVENT_INJECT_SMS = 8;
/** Wakelock release delay when returning to idle state. */
private static final int WAKELOCK_TIMEOUT = 3000;
/** URI for raw table of SMS provider. */
private static final Uri sRawUri = Uri.withAppendedPath(Telephony.Sms.CONTENT_URI, "raw");
protected final Context mContext;
private final ContentResolver mResolver;
/** Special handler for WAP push messages. */
private final WapPushOverSms mWapPush;
/** Wake lock to ensure device stays awake while dispatching the SMS intents. */
final PowerManager.WakeLock mWakeLock;
/** DefaultState throws an exception or logs an error for unhandled message types. */
final DefaultState mDefaultState = new DefaultState();
/** Startup state. Waiting for {@link SmsBroadcastUndelivered} to complete. */
final StartupState mStartupState = new StartupState();
/** Idle state. Waiting for messages to process. */
final IdleState mIdleState = new IdleState();
/** Delivering state. Saves the PDU in the raw table and acknowledges to SMSC. */
final DeliveringState mDeliveringState = new DeliveringState();
/** Broadcasting state. Waits for current broadcast to complete before delivering next. */
final WaitingState mWaitingState = new WaitingState();
/** Helper class to check whether storage is available for incoming messages. */
protected SmsStorageMonitor mStorageMonitor;
private final boolean mSmsReceiveDisabled;
protected PhoneBase mPhone;
protected CellBroadcastHandler mCellBroadcastHandler;
private UserManager mUserManager;
/**
* Create a new SMS broadcast helper.
* @param name the class name for logging
* @param context the context of the phone app
* @param storageMonitor the SmsStorageMonitor to check for storage availability
*/
protected InboundSmsHandler(String name, Context context, SmsStorageMonitor storageMonitor,
PhoneBase phone, CellBroadcastHandler cellBroadcastHandler) {
super(name);
mContext = context;
mStorageMonitor = storageMonitor;
mPhone = phone;
mCellBroadcastHandler = cellBroadcastHandler;
mResolver = context.getContentResolver();
mWapPush = new WapPushOverSms(context);
boolean smsCapable = mContext.getResources().getBoolean(
com.android.internal.R.bool.config_sms_capable);
mSmsReceiveDisabled = !SystemProperties.getBoolean(
TelephonyProperties.PROPERTY_SMS_RECEIVE, smsCapable);
PowerManager pm = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
mWakeLock.acquire(); // wake lock released after we enter idle state
mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
addState(mDefaultState);
addState(mStartupState, mDefaultState);
addState(mIdleState, mDefaultState);
addState(mDeliveringState, mDefaultState);
addState(mWaitingState, mDeliveringState);
setInitialState(mStartupState);
if (DBG) log("created InboundSmsHandler");
}
/**
* Tell the state machine to quit after processing all messages.
*/
public void dispose() {
quit();
}
/**
* Update the phone object when it changes.
*/
public void updatePhoneObject(PhoneBase phone) {
sendMessage(EVENT_UPDATE_PHONE_OBJECT, phone);
}
/**
* Dispose of the WAP push object and release the wakelock.
*/
@Override
protected void onQuitting() {
mWapPush.dispose();
while (mWakeLock.isHeld()) {
mWakeLock.release();
}
}
// CAF_MSIM Is this used anywhere ? if not remove it
public PhoneBase getPhone() {
return mPhone;
}
/**
* This parent state throws an exception (for debug builds) or prints an error for unhandled
* message types.
*/
class DefaultState extends State {
@Override
public boolean processMessage(Message msg) {
switch (msg.what) {
case EVENT_UPDATE_PHONE_OBJECT: {
onUpdatePhoneObject((PhoneBase) msg.obj);
break;
}
default: {
String errorText = "processMessage: unhandled message type " + msg.what +
" currState=" + getCurrentState().getName();
if (Build.IS_DEBUGGABLE) {
loge("---- Dumping InboundSmsHandler ----");
loge("Total records=" + getLogRecCount());
for (int i = Math.max(getLogRecSize() - 20, 0); i < getLogRecSize(); i++) {
loge("Rec[%d]: %s\n" + i + getLogRec(i).toString());
}
loge("---- Dumped InboundSmsHandler ----");
throw new RuntimeException(errorText);
} else {
loge(errorText);
}
break;
}
}
return HANDLED;
}
}
/**
* The Startup state waits for {@link SmsBroadcastUndelivered} to process the raw table and
* notify the state machine to broadcast any complete PDUs that might not have been broadcast.
*/
class StartupState extends State {
@Override
public boolean processMessage(Message msg) {
log("StartupState.processMessage:" + msg.what);
switch (msg.what) {
case EVENT_NEW_SMS:
case EVENT_INJECT_SMS:
case EVENT_BROADCAST_SMS:
deferMessage(msg);
return HANDLED;
case EVENT_START_ACCEPTING_SMS:
transitionTo(mIdleState);
return HANDLED;
case EVENT_BROADCAST_COMPLETE:
case EVENT_RETURN_TO_IDLE:
case EVENT_RELEASE_WAKELOCK:
default:
// let DefaultState handle these unexpected message types
return NOT_HANDLED;
}
}
}
/**
* In the idle state the wakelock is released until a new SM arrives, then we transition
* to Delivering mode to handle it, acquiring the wakelock on exit.
*/
class IdleState extends State {
@Override
public void enter() {
if (DBG) log("entering Idle state");
sendMessageDelayed(EVENT_RELEASE_WAKELOCK, WAKELOCK_TIMEOUT);
}
@Override
public void exit() {
mWakeLock.acquire();
if (DBG) log("acquired wakelock, leaving Idle state");
}
@Override
public boolean processMessage(Message msg) {
log("IdleState.processMessage:" + msg.what);
if (DBG) log("Idle state processing message type " + msg.what);
switch (msg.what) {
case EVENT_NEW_SMS:
case EVENT_INJECT_SMS:
case EVENT_BROADCAST_SMS:
deferMessage(msg);
transitionTo(mDeliveringState);
return HANDLED;
case EVENT_RELEASE_WAKELOCK:
mWakeLock.release();
if (DBG) {
if (mWakeLock.isHeld()) {
// this is okay as long as we call release() for every acquire()
log("mWakeLock is still held after release");
} else {
log("mWakeLock released");
}
}
return HANDLED;
case EVENT_RETURN_TO_IDLE:
// already in idle state; ignore
return HANDLED;
case EVENT_BROADCAST_COMPLETE:
case EVENT_START_ACCEPTING_SMS:
default:
// let DefaultState handle these unexpected message types
return NOT_HANDLED;
}
}
}
/**
* In the delivering state, the inbound SMS is processed and stored in the raw table.
* The message is acknowledged before we exit this state. If there is a message to broadcast,
* transition to {@link WaitingState} state to send the ordered broadcast and wait for the
* results. When all messages have been processed, the halting state will release the wakelock.
*/
class DeliveringState extends State {
@Override
public void enter() {
if (DBG) log("entering Delivering state");
}
@Override
public void exit() {
if (DBG) log("leaving Delivering state");
}
@Override
public boolean processMessage(Message msg) {
log("DeliveringState.processMessage:" + msg.what);
switch (msg.what) {
case EVENT_NEW_SMS:
// handle new SMS from RIL
handleNewSms((AsyncResult) msg.obj);
sendMessage(EVENT_RETURN_TO_IDLE);
return HANDLED;
case EVENT_INJECT_SMS:
// handle new injected SMS
handleInjectSms((AsyncResult) msg.obj);
sendMessage(EVENT_RETURN_TO_IDLE);
return HANDLED;
case EVENT_BROADCAST_SMS:
// if any broadcasts were sent, transition to waiting state
if (processMessagePart((InboundSmsTracker) msg.obj)) {
transitionTo(mWaitingState);
}
return HANDLED;
case EVENT_RETURN_TO_IDLE:
// return to idle after processing all other messages
transitionTo(mIdleState);
return HANDLED;
case EVENT_RELEASE_WAKELOCK:
mWakeLock.release(); // decrement wakelock from previous entry to Idle
if (!mWakeLock.isHeld()) {
// wakelock should still be held until 3 seconds after we enter Idle
loge("mWakeLock released while delivering/broadcasting!");
}
return HANDLED;
// we shouldn't get this message type in this state, log error and halt.
case EVENT_BROADCAST_COMPLETE:
case EVENT_START_ACCEPTING_SMS:
default:
// let DefaultState handle these unexpected message types
return NOT_HANDLED;
}
}
}
/**
* The waiting state delegates handling of new SMS to parent {@link DeliveringState}, but
* defers handling of the {@link #EVENT_BROADCAST_SMS} phase until after the current
* result receiver sends {@link #EVENT_BROADCAST_COMPLETE}. Before transitioning to
* {@link DeliveringState}, {@link #EVENT_RETURN_TO_IDLE} is sent to transition to
* {@link IdleState} after any deferred {@link #EVENT_BROADCAST_SMS} messages are handled.
*/
class WaitingState extends State {
@Override
public boolean processMessage(Message msg) {
log("WaitingState.processMessage:" + msg.what);
switch (msg.what) {
case EVENT_BROADCAST_SMS:
// defer until the current broadcast completes
deferMessage(msg);
return HANDLED;
case EVENT_BROADCAST_COMPLETE:
// return to idle after handling all deferred messages
sendMessage(EVENT_RETURN_TO_IDLE);
transitionTo(mDeliveringState);
return HANDLED;
case EVENT_RETURN_TO_IDLE:
// not ready to return to idle; ignore
return HANDLED;
default:
// parent state handles the other message types
return NOT_HANDLED;
}
}
}
void handleNewSms(AsyncResult ar) {
if (ar.exception != null) {
loge("Exception processing incoming SMS: " + ar.exception);
return;
}
int result;
try {
SmsMessage sms = (SmsMessage) ar.result;
result = dispatchMessage(sms.mWrappedSmsMessage);
} catch (RuntimeException ex) {
loge("Exception dispatching message", ex);
result = Intents.RESULT_SMS_GENERIC_ERROR;
}
// RESULT_OK means that the SMS will be acknowledged by special handling,
// e.g. for SMS-PP data download. Any other result, we should ack here.
if (result != Activity.RESULT_OK) {
boolean handled = (result == Intents.RESULT_SMS_HANDLED);
notifyAndAcknowledgeLastIncomingSms(handled, result, null);
}
}
/**
* This method is called when a new SMS PDU is injected into application framework.
* @param ar is the AsyncResult that has the SMS PDU to be injected.
*/
void handleInjectSms(AsyncResult ar) {
int result;
PendingIntent receivedIntent = null;
try {
receivedIntent = (PendingIntent) ar.userObj;
SmsMessage sms = (SmsMessage) ar.result;
if (sms == null) {
result = Intents.RESULT_SMS_GENERIC_ERROR;
} else {
result = dispatchMessage(sms.mWrappedSmsMessage);
}
} catch (RuntimeException ex) {
loge("Exception dispatching message", ex);
result = Intents.RESULT_SMS_GENERIC_ERROR;
}
if (receivedIntent != null) {
try {
receivedIntent.send(result);
} catch (CanceledException e) { }
}
}
/**
* Process an SMS message from the RIL, calling subclass methods to handle 3GPP and
* 3GPP2-specific message types.
*
* @param smsb the SmsMessageBase object from the RIL
* @return a result code from {@link android.provider.Telephony.Sms.Intents},
* or {@link Activity#RESULT_OK} for delayed acknowledgment to SMSC
*/
public int dispatchMessage(SmsMessageBase smsb) {
// If sms is null, there was a parsing error.
if (smsb == null) {
loge("dispatchSmsMessage: message is null");
return Intents.RESULT_SMS_GENERIC_ERROR;
}
if (mSmsReceiveDisabled) {
// Device doesn't support receiving SMS,
log("Received short message on device which doesn't support "
+ "receiving SMS. Ignored.");
return Intents.RESULT_SMS_HANDLED;
}
return dispatchMessageRadioSpecific(smsb);
}
/**
* Process voicemail notification, SMS-PP data download, CDMA CMAS, CDMA WAP push, and other
* 3GPP/3GPP2-specific messages. Regular SMS messages are handled by calling the shared
* {@link #dispatchNormalMessage} from this class.
*
* @param smsb the SmsMessageBase object from the RIL
* @return a result code from {@link android.provider.Telephony.Sms.Intents},
* or {@link Activity#RESULT_OK} for delayed acknowledgment to SMSC
*/
protected abstract int dispatchMessageRadioSpecific(SmsMessageBase smsb);
/**
* Send an acknowledge message to the SMSC.
* @param success indicates that last message was successfully received.
* @param result result code indicating any error
* @param response callback message sent when operation completes.
*/
protected abstract void acknowledgeLastIncomingSms(boolean success,
int result, Message response);
/**
* Called when the phone changes the default method updates mPhone
* mStorageMonitor and mCellBroadcastHandler.updatePhoneObject.
* Override if different or other behavior is desired.
*
* @param phone
*/
protected void onUpdatePhoneObject(PhoneBase phone) {
mPhone = phone;
mStorageMonitor = mPhone.mSmsStorageMonitor;
log("onUpdatePhoneObject: phone=" + mPhone.getClass().getSimpleName());
}
/**
* Notify interested apps if the framework has rejected an incoming SMS,
* and send an acknowledge message to the network.
* @param success indicates that last message was successfully received.
* @param result result code indicating any error
* @param response callback message sent when operation completes.
*/
void notifyAndAcknowledgeLastIncomingSms(boolean success,
int result, Message response) {
if (!success) {
// broadcast SMS_REJECTED_ACTION intent
Intent intent = new Intent(Intents.SMS_REJECTED_ACTION);
intent.putExtra("result", result);
mContext.sendBroadcast(intent, android.Manifest.permission.RECEIVE_SMS);
}
acknowledgeLastIncomingSms(success, result, response);
}
/**
* Return true if this handler is for 3GPP2 messages; false for 3GPP format.
* @return true for the 3GPP2 handler; false for the 3GPP handler
*/
protected abstract boolean is3gpp2();
/**
* Dispatch a normal incoming SMS. This is called from {@link #dispatchMessageRadioSpecific}
* if no format-specific handling was required. Saves the PDU to the SMS provider raw table,
* creates an {@link InboundSmsTracker}, then sends it to the state machine as an
* {@link #EVENT_BROADCAST_SMS}. Returns {@link Intents#RESULT_SMS_HANDLED} or an error value.
*
* @param sms the message to dispatch
* @return {@link Intents#RESULT_SMS_HANDLED} if the message was accepted, or an error status
*/
protected int dispatchNormalMessage(SmsMessageBase sms) {
SmsHeader smsHeader = sms.getUserDataHeader();
InboundSmsTracker tracker;
if ((smsHeader == null) || (smsHeader.concatRef == null)) {
// Message is not concatenated.
int destPort = -1;
if (smsHeader != null && smsHeader.portAddrs != null) {
// The message was sent to a port.
destPort = smsHeader.portAddrs.destPort;
if (DBG) log("destination port: " + destPort);
}
tracker = new InboundSmsTracker(sms.getPdu(), sms.getTimestampMillis(), destPort,
is3gpp2(), false);
} else {
// Create a tracker for this message segment.
SmsHeader.ConcatRef concatRef = smsHeader.concatRef;
SmsHeader.PortAddrs portAddrs = smsHeader.portAddrs;
int destPort = (portAddrs != null ? portAddrs.destPort : -1);
tracker = new InboundSmsTracker(sms.getPdu(), sms.getTimestampMillis(), destPort,
is3gpp2(), sms.getOriginatingAddress(), concatRef.refNumber,
concatRef.seqNumber, concatRef.msgCount, false);
}
if (VDBG) log("created tracker: " + tracker);
return addTrackerToRawTableAndSendMessage(tracker);
}
/**
* Helper to add the tracker to the raw table and then send a message to broadcast it, if
* successful. Returns the SMS intent status to return to the SMSC.
* @param tracker the tracker to save to the raw table and then deliver
* @return {@link Intents#RESULT_SMS_HANDLED} or {@link Intents#RESULT_SMS_GENERIC_ERROR}
* or {@link Intents#RESULT_SMS_DUPLICATED}
*/
protected int addTrackerToRawTableAndSendMessage(InboundSmsTracker tracker) {
switch(addTrackerToRawTable(tracker)) {
case Intents.RESULT_SMS_HANDLED:
sendMessage(EVENT_BROADCAST_SMS, tracker);
return Intents.RESULT_SMS_HANDLED;
case Intents.RESULT_SMS_DUPLICATED:
return Intents.RESULT_SMS_HANDLED;
case Intents.RESULT_SMS_GENERIC_ERROR:
default:
return Intents.RESULT_SMS_GENERIC_ERROR;
}
}
/**
* Process the inbound SMS segment. If the message is complete, send it as an ordered
* broadcast to interested receivers and return true. If the message is a segment of an
* incomplete multi-part SMS, return false.
* @param tracker the tracker containing the message segment to process
* @return true if an ordered broadcast was sent; false if waiting for more message segments
*/
boolean processMessagePart(InboundSmsTracker tracker) {
int messageCount = tracker.getMessageCount();
byte[][] pdus;
int destPort = tracker.getDestPort();
if (messageCount == 1) {
// single-part message
pdus = new byte[][]{tracker.getPdu()};
} else {
// multi-part message
Cursor cursor = null;
try {
// used by several query selection arguments
String address = tracker.getAddress();
String refNumber = Integer.toString(tracker.getReferenceNumber());
String count = Integer.toString(tracker.getMessageCount());
// query for all segments and broadcast message if we have all the parts
String[] whereArgs = {address, refNumber, count};
cursor = mResolver.query(sRawUri, PDU_SEQUENCE_PORT_PROJECTION,
SELECT_BY_REFERENCE, whereArgs, null);
int cursorCount = cursor.getCount();
if (cursorCount < messageCount) {
// Wait for the other message parts to arrive. It's also possible for the last
// segment to arrive before processing the EVENT_BROADCAST_SMS for one of the
// earlier segments. In that case, the broadcast will be sent as soon as all
// segments are in the table, and any later EVENT_BROADCAST_SMS messages will
// get a row count of 0 and return.
return false;
}
// All the parts are in place, deal with them
pdus = new byte[messageCount][];
while (cursor.moveToNext()) {
// subtract offset to convert sequence to 0-based array index
int index = cursor.getInt(SEQUENCE_COLUMN) - tracker.getIndexOffset();
pdus[index] = HexDump.hexStringToByteArray(cursor.getString(PDU_COLUMN));
// Read the destination port from the first segment (needed for CDMA WAP PDU).
// It's not a bad idea to prefer the port from the first segment in other cases.
if (index == 0 && !cursor.isNull(DESTINATION_PORT_COLUMN)) {
int port = cursor.getInt(DESTINATION_PORT_COLUMN);
// strip format flags and convert to real port number, or -1
port = InboundSmsTracker.getRealDestPort(port);
if (port != -1) {
destPort = port;
}
}
}
} catch (SQLException e) {
loge("Can't access multipart SMS database", e);
return false;
} finally {
if (cursor != null) {
cursor.close();
}
}
}
BroadcastReceiver resultReceiver = new SmsBroadcastReceiver(tracker);
if (destPort == SmsHeader.PORT_WAP_PUSH) {
// Build up the data stream
ByteArrayOutputStream output = new ByteArrayOutputStream();
for (byte[] pdu : pdus) {
// 3GPP needs to extract the User Data from the PDU; 3GPP2 has already done this
if (!tracker.is3gpp2()) {
SmsMessage msg = SmsMessage.createFromPdu(pdu, SmsConstants.FORMAT_3GPP);
pdu = msg.getUserData();
}
output.write(pdu, 0, pdu.length);
}
int result = mWapPush.dispatchWapPdu(output.toByteArray(), resultReceiver, this);
if (DBG) log("dispatchWapPdu() returned " + result);
// result is Activity.RESULT_OK if an ordered broadcast was sent
return (result == Activity.RESULT_OK);
}
Intent intent = new Intent(Intents.SMS_FILTER_ACTION);
List