修复 sing-box TUN 模式下 relay 出站的 mux 问题 (#9018)

* Fix sing-box selector generation for dynamic group tags

* 修复 TUN 模式下 DNS 失败及 Windows 提权重启后 TUN 状态丢失

* 按上游意见回滚 TUN 提权时保留启用状态的改动

v2rayN/ServiceLib/Common/ProcUtils.cs

@@ -46,7 +46,7 @@ public static class ProcUtils
         return null;
     }
 
-    public static void RebootAsAdmin(bool blAdmin = true)
+    public static bool RebootAsAdmin(bool blAdmin = true)
     {
         try
         {
@@ -58,11 +58,12 @@ public static class ProcUtils
                 FileName = Utils.GetExePath().AppendQuotes(),
                 Verb = blAdmin ? "runas" : null,
             };
-            _ = Process.Start(startInfo);
+            return Process.Start(startInfo) != null;
         }
         catch (Exception ex)
         {
             Logging.SaveLog(_tag, ex);
+            return false;
         }
     }
 }

v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxOutboundService.cs

@@ -345,6 +345,14 @@ public partial class CoreConfigSingboxService
     {
         try
         {
+            // The synthetic TUN relay outbound talks to the local Xray shadowsocks relay.
+            // Xray cannot terminate sing-box h2mux, so muxing here turns local relay traffic
+            // into sp.mux.sing-box.arpa pseudo-destinations and breaks DNS over TUN.
+            if (IsTunRelayProxyOutbound())
+            {
+                return;
+            }
+
             var muxEnabled = _node.MuxEnabled ?? _config.CoreBasicItem.MuxEnabled;
             if (muxEnabled && _config.Mux4SboxItem.Protocol.IsNotEmpty())
             {
@@ -364,6 +372,21 @@ public partial class CoreConfigSingboxService
         }
     }
 
+    private bool IsTunRelayProxyOutbound()
+    {
+        if (!context.IsTunEnabled
+            || _node.ConfigType != EConfigType.Shadowsocks
+            || _node.Address != Global.Loopback
+            || _node.Port != context.ProxyRelaySsPort
+            || _node.Password != Global.None)
+        {
+            return false;
+        }
+
+        var protocolExtra = _node.GetProtocolExtra();
+        return protocolExtra.SsMethod == Global.None;
+    }
+
     private void FillOutboundTls(Outbound4Sbox outbound)
     {
         try

v2rayN/ServiceLib/ViewModels/StatusBarViewModel.cs

@@ -490,6 +490,7 @@ public class StatusBarViewModel : MyReactiveObject
                 }
             }
         }
+
         await ConfigHandler.SaveConfig(_config);
         AppEvents.ReloadRequested.Publish();
     }