From 35b98f945fb2628d5aca5adf050f53703aea7501 Mon Sep 17 00:00:00 2001
From: DHR60 <dehongren60@gmail.com>
Date: Sun, 19 Apr 2026 05:42:55 +0000
Subject: [PATCH] Support new fragment (#9122)

---
 v2rayN/ServiceLib/Handler/ConfigHandler.cs    |  2 +-
 v2rayN/ServiceLib/Models/V2rayConfig.cs       | 18 +++-
 .../CoreConfig/V2ray/V2rayOutboundService.cs  | 97 +++++++++++++------
 3 files changed, 84 insertions(+), 33 deletions(-)

diff --git a/v2rayN/ServiceLib/Handler/ConfigHandler.cs b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
index da7258a7..a49f12f7 100644
--- a/v2rayN/ServiceLib/Handler/ConfigHandler.cs
+++ b/v2rayN/ServiceLib/Handler/ConfigHandler.cs
@@ -162,7 +162,7 @@ public static class ConfigHandler
         config.Fragment4RayItem ??= new()
         {
             Packets = "tlshello",
-            Length = "100-200",
+            Length = "50-100",
             Interval = "10-20"
         };
         config.GlobalHotkeys ??= new();
diff --git a/v2rayN/ServiceLib/Models/V2rayConfig.cs b/v2rayN/ServiceLib/Models/V2rayConfig.cs
index 909a37fb..b6aaa2df 100644
--- a/v2rayN/ServiceLib/Models/V2rayConfig.cs
+++ b/v2rayN/ServiceLib/Models/V2rayConfig.cs
@@ -140,11 +140,10 @@ public class Outboundsettings4Ray
 
     public int? userLevel { get; set; }
 
-    public FragmentItem4Ray? fragment { get; set; }
-
     public string? secretKey { get; set; }
 
-    public Object? address { get; set; }
+    public object? address { get; set; }
+
     public int? port { get; set; }
 
     public List<WireguardPeer4Ray>? peers { get; set; }
@@ -501,6 +500,19 @@ public class MaskSettings4Ray
 {
     public string? password { get; set; }
     public string? domain { get; set; }
+    // fragment
+    public string? packets { get; set; }
+    public string? length { get; set; }
+    public string? delay { get; set; }
+    // noise
+    public int? reset { get; set; }
+    public List<NoiseMask4Ray>? noise { get; set; }
+}
+
+public class NoiseMask4Ray
+{
+    public string? rand { get; set; }
+    public string? delay { get; set; }
 }
 
 public class QuicParams4Ray
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
index d40ed8a3..8b3da6b5 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayOutboundService.cs
@@ -12,6 +12,10 @@ public partial class CoreConfigV2rayService
             GenObservatory(multipleLoad);
             GenBalancer(multipleLoad);
         }
+        if (_config.CoreBasicItem.EnableFragment)
+        {
+            ApplyOutboundFragment();
+        }
         if (context.IsTunEnabled)
         {
             _coreConfig.outbounds.Add(BuildDnsOutbound());
@@ -29,35 +33,6 @@ public partial class CoreConfigV2rayService
         {
             proxyOutboundList.Add(BuildProxyOutbound(baseTagName));
         }
-
-        if (_config.CoreBasicItem.EnableFragment)
-        {
-            var fragmentOutbound = new Outbounds4Ray
-            {
-                protocol = "freedom",
-                tag = $"frag-{baseTagName}",
-                settings = new()
-                {
-                    fragment = new()
-                    {
-                        packets = _config.Fragment4RayItem?.Packets,
-                        length = _config.Fragment4RayItem?.Length,
-                        interval = _config.Fragment4RayItem?.Interval
-                    }
-                }
-            };
-            var actOutboundWithTlsList =
-                proxyOutboundList.Where(n => n.streamSettings?.security.IsNullOrEmpty() == false
-                                             && (n.streamSettings?.sockopt?.dialerProxy?.IsNullOrEmpty() ?? true)).ToList();
-            if (actOutboundWithTlsList.Count > 0)
-            {
-                proxyOutboundList.Add(fragmentOutbound);
-            }
-            foreach (var outbound in actOutboundWithTlsList)
-            {
-                FillDialerProxy(outbound, fragmentOutbound.tag);
-            }
-        }
         return proxyOutboundList;
     }
 
@@ -837,4 +812,68 @@ public partial class CoreConfigV2rayService
         var outbound = new Outbounds4Ray { tag = Global.DnsOutboundTag, protocol = "dns", };
         return outbound;
     }
+
+    private void ApplyOutboundFragment()
+    {
+        var actOutboundWithTlsList =
+            _coreConfig.outbounds.Where(n => n.streamSettings?.security.IsNullOrEmpty() == false
+                                             && (n.streamSettings?.sockopt?.dialerProxy?.IsNullOrEmpty() ?? true))
+                .ToList();
+
+        var configPackets = _config.Fragment4RayItem?.Packets ?? "tlshello";
+        var configLength = _config.Fragment4RayItem?.Length ?? "50-100";
+        var configDelay = _config.Fragment4RayItem?.Interval ?? "10-20";
+
+        var fragmentMask = new Mask4Ray
+        {
+            type = "fragment",
+            settings = new MaskSettings4Ray
+            {
+                packets = configPackets,
+                length = configLength,
+                delay = configDelay,
+            }
+        };
+        var noiseMask = new Mask4Ray
+        {
+            type = "noise",
+            settings = new MaskSettings4Ray
+            {
+                length = "10-20",
+                delay = "10-16",
+            }
+        };
+
+        foreach (var outbound in actOutboundWithTlsList)
+        {
+            //var packets = configPackets;
+            //if (outbound.streamSettings.security == Global.StreamSecurityReality
+            //    && packets == "tlshello")
+            //{
+            //    packets = "1-3";
+            //}
+            //else if (outbound.streamSettings.security == Global.StreamSecurity
+            //         && packets != "tlshello")
+            //{
+            //    packets = "tlshello";
+            //}
+            var finalMaskJsonObj = JsonUtils.ParseJson(JsonUtils.Serialize(outbound.streamSettings?.finalmask)) as JsonObject ?? new JsonObject();
+            // tcp fragment
+            var tcpFinalmaskList = finalMaskJsonObj["tcp"] as JsonArray ?? [];
+            if (tcpFinalmaskList.Count == 0)
+            {
+                tcpFinalmaskList.Add(JsonUtils.SerializeToNode(fragmentMask));
+                finalMaskJsonObj["tcp"] = tcpFinalmaskList;
+            }
+            // udp noise
+            var udpFinalmaskList = finalMaskJsonObj["udp"] as JsonArray ?? [];
+            if (udpFinalmaskList.Count == 0)
+            {
+                udpFinalmaskList.Add(JsonUtils.SerializeToNode(noiseMask));
+                finalMaskJsonObj["udp"] = udpFinalmaskList;
+            }
+            // write back
+            outbound.streamSettings.finalmask = finalMaskJsonObj;
+        }
+    }
 }