From a810f82ce2a03c93962e39e92c44efa0c17eac5e Mon Sep 17 00:00:00 2001
From: Koen J <git@unkto.com>
Date: Fri, 6 Jun 2025 11:20:04 +0200
Subject: [PATCH] Added boolean setting to allow link local casting over ipv4.

---
 .../main/java/com/futo/platformplayer/Settings.kt   |  5 +++++
 .../com/futo/platformplayer/casting/StateCasting.kt | 13 ++++++++++---
 app/src/main/res/values/strings.xml                 |  2 ++
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/com/futo/platformplayer/Settings.kt b/app/src/main/java/com/futo/platformplayer/Settings.kt
index 560ceb0a..281523c6 100644
--- a/app/src/main/java/com/futo/platformplayer/Settings.kt
+++ b/app/src/main/java/com/futo/platformplayer/Settings.kt
@@ -628,6 +628,11 @@ class Settings : FragmentedStorageFileJson() {
         @Serializable(with = FlexibleBooleanSerializer::class)
         var allowIpv6: Boolean = true;
 
+        @AdvancedField
+        @FormField(R.string.allow_ipv4, FieldForm.TOGGLE, R.string.allow_ipv4_description, 5)
+        @Serializable(with = FlexibleBooleanSerializer::class)
+        var allowLinkLocalIpv4: Boolean = false;
+
         /*TODO: Should we have a different casting quality?
         @FormField("Preferred Casting Quality", FieldForm.DROPDOWN, "", 3)
         @DropdownFieldOptionsId(R.array.preferred_quality_array)
diff --git a/app/src/main/java/com/futo/platformplayer/casting/StateCasting.kt b/app/src/main/java/com/futo/platformplayer/casting/StateCasting.kt
index b2c2156c..1e8e1830 100644
--- a/app/src/main/java/com/futo/platformplayer/casting/StateCasting.kt
+++ b/app/src/main/java/com/futo/platformplayer/casting/StateCasting.kt
@@ -1221,9 +1221,16 @@ class StateCasting {
 
     private fun getLocalUrl(ad: CastingDevice): String {
         var address = ad.localAddress!!
-        if (address.isLinkLocalAddress) {
-            address = findPreferredAddress() ?: address
-            Logger.i(TAG, "Selected casting address: $address")
+        if (Settings.instance.casting.allowLinkLocalIpv4) {
+            if (address.isLinkLocalAddress && address is Inet6Address) {
+                address = findPreferredAddress() ?: address
+                Logger.i(TAG, "Selected casting address: $address")
+            }
+        } else {
+            if (address.isLinkLocalAddress) {
+                address = findPreferredAddress() ?: address
+                Logger.i(TAG, "Selected casting address: $address")
+            }
         }
         return "http://${address.toUrlAddress().trim('/')}:${_castServer.port}";
     }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 98f542c0..cd96fd44 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -76,6 +76,8 @@
     <string name="always_proxy_requests_description">Always proxy requests when casting data through the device.</string>
     <string name="allow_ipv6">Allow IPV6</string>
     <string name="allow_ipv6_description">If casting over IPV6 is allowed, can cause issues on some networks</string>
+    <string name="allow_ipv4">Allow Link Local IPV4</string>
+    <string name="allow_ipv4_description">If casting over IPV4 link local is allowed, can cause issues on some networks</string>
     <string name="discover">Discover</string>
     <string name="find_new_video_sources_to_add">Find new video sources to add</string>
     <string name="these_sources_have_been_disabled">These sources have been disabled</string>