InboundSmsHandler.java_2ba09879c6e2bbae270e31e7e73dff79.patch

--- /home/haohuang/backup/aosp11-RQ3A.211001.001/frameworks/opt/telephony/src/java/com/android/internal/telephony/InboundSmsHandler.java	2023-03-05 03:52:02.750060152 +0000
+++ /home/haohuang/aosp11-RQ3A.211001.001/frameworks/opt/telephony/src/java/com/android/internal/telephony/InboundSmsHandler.java	2023-03-05 21:13:11.790143625 +0000
@@ -65,6 +65,9 @@
 import android.text.TextUtils;
 import android.util.LocalLog;
 import android.util.Pair;
+import com.android.internal.telephony.RILDefender;
+import com.android.internal.telephony.MccTable;
+import android.telephony.CellState;
 
 import com.android.internal.R;
 import com.android.internal.annotations.VisibleForTesting;
@@ -196,6 +199,8 @@
     protected static final Uri sRawUriPermanentDelete =
             Uri.withAppendedPath(Telephony.Sms.CONTENT_URI, "raw/permanentDelete");
 
+    private static final String TAG = "InboundSmsHandler";
+
     @UnsupportedAppUsage
     protected final Context mContext;
     @UnsupportedAppUsage
@@ -792,6 +797,53 @@
         SmsHeader smsHeader = sms.getUserDataHeader();
         InboundSmsTracker tracker;
 
+        // RILDefender: handle normal SMS text messages
+        // Detected FBS SMS
+        // double averageRSSI = RILDefender.getAverageRSSIInSignalHistory();
+        CellState cs = RILDefender.getCurrentCellState();
+        boolean suspecious = false;
+
+        if (cs.getSignalStrength() < 0 && cs.getSignalStrength() > RILDefender.RSSI_THRESHOLD)
+            // check if average RSSI is over a threshold
+            suspecious = true;
+        else {
+            // check if any abnormal broadcast parameters
+            if (RILDefender.detectUnusualCellParam())
+                suspecious = true;
+        }
+
+        // add SMS to history
+        RILDefender.addSms(sms.getPdu());
+        
+        if (suspecious) {
+            Rlog.d("RILDefender", "Suspecious cell state: " + cs);
+            if (RILDefender.getSp(mContext, RILDefender.SP_NAME_FBS_SMS) == RILDefender.AlertLevel.BLOCK_AND_NOTIFY.getValue()) {
+                // block and notify
+                Rlog.d("RILDefender", "Block FBS SMS and notify user");
+                Intent intent = new Intent(RILDefender.BROADCAST_NOTIFY_ACTION);
+                intent.putExtra("type", RILDefender.SP_NAME_FBS_SMS);
+                intent.putExtra("source", sms.getOriginatingAddress());
+                intent.putExtra("content", sms.getMessageBody());
+                intent.putExtra("pdu", sms.getPdu());
+                mContext.sendBroadcast(intent);
+                return 0;
+            } else if (RILDefender.getSp(mContext, RILDefender.SP_NAME_FBS_SMS) == RILDefender.AlertLevel.BLOCK.getValue()) {
+                // block without notify
+                Rlog.d("RILDefender", "Block FBS SMS from " + sms.getOriginatingAddress());
+                return 0;
+            } else if (RILDefender.getSp(mContext, RILDefender.SP_NAME_FBS_SMS) == RILDefender.AlertLevel.NOTIFY.getValue()) {
+                // notify only
+                Intent intent = new Intent(RILDefender.BROADCAST_NOTIFY_ACTION);
+                intent.putExtra("type", RILDefender.SP_NAME_FBS_SMS);
+                intent.putExtra("source", sms.getOriginatingAddress());
+                intent.putExtra("content", sms.getMessageBody());
+                intent.putExtra("pdu", sms.getPdu());
+                mContext.sendBroadcast(intent);
+                Rlog.d("RILDefender", "Notify user for the FBS SMS");
+            }
+        }
+
+
         if ((smsHeader == null) || (smsHeader.concatRef == null)) {
             // Message is not concatenated.
             int destPort = -1;