OnBootReceiver: Attempt at checking for interface availability at boot

It probably needs some more polish

Author: elluisian

app/src/main/java/net/christianbeier/droidvnc_ng/OnBootReceiver.java

@@ -30,14 +30,29 @@
 import android.content.SharedPreferences;
 import android.os.Build;
 import androidx.preference.PreferenceManager;
+import androidx.core.app.NotificationCompat;
+import androidx.core.app.NotificationManagerCompat;
+import android.app.NotificationManager;
+import android.app.NotificationChannel;
 import android.os.SystemClock;
 import android.util.Log;
 
+import java.util.ArrayList;
+
+import java.net.InetAddress;
+import java.net.Socket;
+import java.net.InetSocketAddress;
+import java.io.IOException;
+
+
 
 public class OnBootReceiver extends BroadcastReceiver {
 
     private static final String TAG = "OnBootReceiver";
 
+    public static String NOTIFICATION_ID = "notification-id";
+    public static String NOTIFICATION = "notification" ;
+
     public void onReceive(Context context, Intent arg1)
     {
         if(Intent.ACTION_BOOT_COMPLETED.equals(arg1.getAction())) {
@@ -52,9 +67,18 @@ public void onReceive(Context context, Intent arg1)
                 return;
             }
 
+            // Check for availability of listenIf
+            String listenIf = prefs.getString(Constants.PREFS_KEY_SETTINGS_LISTEN_INTERFACE, defaults.getListenInterface());
+            NetworkInterfaceTester nit = NetworkInterfaceTester.getInstance(context);
+            if (!nit.isIfEnabled(listenIf)) {
+                Log.w(TAG, "onReceive: interface \"" + listenIf + "\" not available, sending a notification");
+                this.sendNotification(context, listenIf);
+                return;
+            }
+
             Intent intent = new Intent(context, MainService.class);
             intent.setAction(MainService.ACTION_START);
-            intent.putExtra(MainService.EXTRA_LISTEN_INTERFACE, prefs.getString(Constants.PREFS_KEY_SETTINGS_LISTEN_INTERFACE, defaults.getListenInterface()));
+            intent.putExtra(MainService.EXTRA_LISTEN_INTERFACE, listenIf);
             intent.putExtra(MainService.EXTRA_PORT, prefs.getInt(Constants.PREFS_KEY_SETTINGS_PORT, defaults.getPort()));
             intent.putExtra(MainService.EXTRA_PASSWORD, prefs.getString(Constants.PREFS_KEY_SETTINGS_PASSWORD, defaults.getPassword()));
             intent.putExtra(MainService.EXTRA_FILE_TRANSFER, prefs.getBoolean(Constants.PREFS_KEY_SETTINGS_FILE_TRANSFER, defaults.getFileTransfer()));
@@ -88,4 +112,27 @@ public void onReceive(Context context, Intent arg1)
         }
     }
 
-}
+
+    private void sendNotification(Context context, String listenIf) {
+        NotificationManager manager = context.getSystemService(NotificationManager.class);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            NotificationChannel serviceChannel = new NotificationChannel(
+                context.getPackageName(),
+                "ListenIf NA Channel",
+                NotificationManager.IMPORTANCE_DEFAULT
+            );
+            manager.createNotificationChannel(serviceChannel);
+        }
+
+        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, context.getPackageName())
+            .setSmallIcon(R.drawable.ic_notification)
+            .setContentTitle(context.getResources().getString(R.string.app_name))
+            .setContentText(
+                 String.format("Failed to connect to interface \"%s\", is it down perhaps?", listenIf))
+            .setSilent(false)
+            .setOngoing(true);
+
+        manager.notify(9, builder.build());
+    }
+}