Fix WIFI state permission

app/src/main/java/io/nekohasekai/sfa/bg/DefaultNetworkMonitor.kt

@@ -4,6 +4,7 @@ import android.net.Network
 import android.os.Build
 import io.nekohasekai.libbox.InterfaceUpdateListener
 import io.nekohasekai.sfa.Application
+import java.net.NetworkInterface
 
 object DefaultNetworkMonitor {
 
@@ -35,8 +36,22 @@ object DefaultNetworkMonitor {
         newNetwork: Network?
     ) {
         val listener = listener ?: return
-        val link = Application.connectivity.getLinkProperties(newNetwork ?: return) ?: return
-        listener.updateDefaultInterface(link.interfaceName, -1)
+        if (newNetwork != null) {
+            val interfaceName =
+                (Application.connectivity.getLinkProperties(newNetwork) ?: return).interfaceName
+            for (times in 0 until 10) {
+                var interfaceIndex: Int
+                try {
+                    interfaceIndex = NetworkInterface.getByName(interfaceName).index
+                } catch (e: Exception) {
+                    Thread.sleep(100)
+                    continue
+                }
+                listener.updateDefaultInterface(interfaceName, interfaceIndex)
+            }
+        } else {
+            listener.updateDefaultInterface("", -1)
+        }
     }