Android/tv-casting-app: Adding defensive checks in Discovery/record p…

…arsing (#25464) * Checking if multicastLock isHeld before trying to release it, avoiding stopServiceDiscovery call if discovery failed to start * Android tv-casting-app: Adding defensive checks in DiscoveredNodeData constructor (#108) * Android tv-casting-app: Adding defensive null checks in DiscoveredNodeData constructor * Adding more defensive checks / exception handling
project-chip · Mar 7, 2023 · bfd9b2e · bfd9b2e
1 parent 4203370
commit bfd9b2e
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Showing 3 changed files with 49 additions and 18 deletions.
diff --git a/...ples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/DiscoveredNodeData.java b/...ples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/DiscoveredNodeData.java
@@ -18,13 +18,16 @@
 package com.chip.casting;
 
 import android.net.nsd.NsdServiceInfo;
+import android.util.Log;
 import java.net.InetAddress;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
 public class DiscoveredNodeData {
+  private static final String TAG = DiscoveredNodeData.class.getSimpleName();
+
   private static final int MAX_IP_ADDRESSES = 5;
   private static final int MAX_ROTATING_ID_LEN = 50;
   private static final String KEY_DEVICE_NAME = "DN";
@@ -51,26 +54,54 @@ public class DiscoveredNodeData {
 
   public DiscoveredNodeData(NsdServiceInfo serviceInfo) {
     Map<String, byte[]> attributes = serviceInfo.getAttributes();
-    this.deviceName = new String(attributes.get(KEY_DEVICE_NAME), StandardCharsets.UTF_8);
-    if (serviceInfo.getHost() != null) {
-      this.hostName = serviceInfo.getHost().getHostName();
-    }
-    this.deviceType =
-        Long.parseLong(new String(attributes.get(KEY_DEVICE_TYPE), StandardCharsets.UTF_8));
-
-    String vp = new String(attributes.get(KEY_VENDOR_PRODUCT), StandardCharsets.UTF_8);
-    if (vp != null) {
-      String[] vpArray = vp.split("\\+");
-      if (vpArray.length > 0) {
-        this.vendorId = Long.parseLong(vpArray[0]);
-        if (vpArray.length == 2) {
-          this.productId = Long.parseLong(vpArray[1]);
+
+    if (attributes != null) {
+      if (attributes.get(KEY_DEVICE_NAME) != null) {
+        this.deviceName = new String(attributes.get(KEY_DEVICE_NAME), StandardCharsets.UTF_8);
+      } else {
+        Log.e(TAG, "No device name (DN) found in DiscovoredNodeData");
+      }
+
+      if (attributes.get(KEY_DEVICE_TYPE) != null) {
+        try {
+          this.deviceType =
+              Long.parseLong(new String(attributes.get(KEY_DEVICE_TYPE), StandardCharsets.UTF_8));
+        } catch (NumberFormatException e) {
+          Log.e(TAG, "Could not parse TXT record for DT: " + e.getMessage());
         }
+      } else {
+        Log.e(TAG, "TXT Record for DT was null");
       }
+
+      if (attributes.get(KEY_VENDOR_PRODUCT) != null) {
+        String vp = new String(attributes.get(KEY_VENDOR_PRODUCT), StandardCharsets.UTF_8);
+        if (vp != null) {
+          String[] vpArray = vp.split("\\+");
+          try {
+            if (vpArray.length > 0) {
+              this.vendorId = Long.parseLong(vpArray[0]);
+              if (vpArray.length == 2) {
+                this.productId = Long.parseLong(vpArray[1]);
+              }
+            }
+          } catch (NumberFormatException e) {
+            Log.e(TAG, "Could not parse TXT record for VP: " + e.getMessage());
+          }
+        }
+      } else {
+        Log.e(TAG, "TXT Record for VP was null");
+      }
+    } else {
+      Log.e(TAG, "NsdServiceInfo.attributes was null");
     }
 
+    if (serviceInfo.getHost() != null) {
+      this.hostName = serviceInfo.getHost().getHostName();
+      this.ipAddresses = Arrays.asList(serviceInfo.getHost());
+    } else {
+      Log.e(TAG, "Host name was null");
+    }
     this.port = serviceInfo.getPort();
-    this.ipAddresses = Arrays.asList(serviceInfo.getHost());
     this.numIPs = 1;
   }
 

diff --git a/...es/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/NsdDiscoveryListener.java b/...es/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/NsdDiscoveryListener.java
@@ -111,7 +111,6 @@ public void onStartDiscoveryFailed(String serviceType, int errorCode) {
     failureCallback.handle(
         new MatterError(
             3, "NsdDiscoveryListener Discovery failed to start: Nsd Error code:" + errorCode));
-    nsdManager.stopServiceDiscovery(this);
   }
 
   @Override
@@ -123,6 +122,5 @@ public void onStopDiscoveryFailed(String serviceType, int errorCode) {
     failureCallback.handle(
         new MatterError(
             3, "NsdDiscoveryListener Discovery failed to stop: Nsd Error code:" + errorCode));
-    nsdManager.stopServiceDiscovery(this);
   }
 }
diff --git a/examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/TvCastingApp.java b/examples/tv-casting-app/android/App/app/src/main/jni/com/chip/casting/TvCastingApp.java
@@ -137,7 +137,9 @@ public void discoverVideoPlayerCommissioners(
               public void run() {
                 Log.d(TAG, "TvCastingApp stopping Video Player commissioner discovery");
                 nsdManager.stopServiceDiscovery(nsdDiscoveryListener);
-                multicastLock.release();
+                if (multicastLock.isHeld()) {
+                  multicastLock.release();
+                }
               }
             },
             discoveryDurationSeconds,