From 63d59c896674ac9f386fe9dd13dce2316cf27db6 Mon Sep 17 00:00:00 2001
From: Raymond Lai <airwave209gt@gmail.com>
Date: Fri, 29 Sep 2023 23:17:08 +0800
Subject: [PATCH] Force return IPv4 address when probing network interface for
 listening address

Fixes #3928.
---
 .../main/java/com/amaze/filemanager/utils/NetworkUtil.kt    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/app/src/main/java/com/amaze/filemanager/utils/NetworkUtil.kt b/app/src/main/java/com/amaze/filemanager/utils/NetworkUtil.kt
index 8bf5b4b4d6..ea501ea752 100644
--- a/app/src/main/java/com/amaze/filemanager/utils/NetworkUtil.kt
+++ b/app/src/main/java/com/amaze/filemanager/utils/NetworkUtil.kt
@@ -28,6 +28,7 @@ import android.net.wifi.WifiManager
 import android.os.Build
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
+import java.net.Inet4Address
 import java.net.InetAddress
 import java.net.NetworkInterface
 import java.net.UnknownHostException
@@ -97,7 +98,7 @@ object NetworkUtil {
     /**
      * Determine device's IP address.
      *
-     * Caveat: doesn't handle IPv6 addresses well.
+     * Caveat: doesn't handle IPv6 addresses well. Forcing return IPv4 if possible.
      */
     @JvmStatic
     fun getLocalInetAddress(context: Context): InetAddress? {
@@ -115,7 +116,8 @@ object NetworkUtil {
                 netinterface.inetAddresses.iterator().forEach { address ->
                     // this is the condition that sometimes gives problems
                     if (!address.isLoopbackAddress &&
-                        !address.isLinkLocalAddress
+                        !address.isLinkLocalAddress &&
+                        address is Inet4Address
                     ) {
                         return address
                     }