From 02a8fe0693715841252dde03a410ababec41c6bf Mon Sep 17 00:00:00 2001
From: DHR60 <dehongren60@gmail.com>
Date: Sun, 12 Apr 2026 01:06:41 +0800
Subject: [PATCH] Add sing-box send-through

---
 .../Singbox/CoreConfigSingboxService.cs       |  4 ++
 .../Singbox/SingboxConfigTemplateService.cs   | 36 +++++++++++++++++
 .../V2ray/CoreConfigV2rayService.cs           | 39 -------------------
 .../V2ray/V2rayConfigTemplateService.cs       | 39 +++++++++++++++++++
 v2rayN/v2rayN.slnx                            |  1 +
 5 files changed, 80 insertions(+), 39 deletions(-)

diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/CoreConfigSingboxService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/CoreConfigSingboxService.cs
index 4f0203af..f0a4f0ef 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/CoreConfigSingboxService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/CoreConfigSingboxService.cs
@@ -57,6 +57,8 @@ public partial class CoreConfigSingboxService(CoreConfigContext context)
 
             ConvertGeo2Ruleset();
 
+            ApplyOutboundSendThrough();
+
             ret.Msg = string.Format(ResUI.SuccessfulConfiguration, "");
             ret.Success = true;
 
@@ -221,6 +223,7 @@ public partial class CoreConfigSingboxService(CoreConfigContext context)
                 _coreConfig.route.rules.Add(rule);
             }
 
+            ApplyOutboundSendThrough();
             ret.Success = true;
             ret.Data = JsonUtils.Serialize(_coreConfig);
             return ret;
@@ -279,6 +282,7 @@ public partial class CoreConfigSingboxService(CoreConfigContext context)
                 listen_port = port,
                 type = EInboundProtocol.mixed.ToString(),
             });
+            ApplyOutboundSendThrough();
 
             ret.Msg = string.Format(ResUI.SuccessfulConfiguration, "");
             ret.Success = true;
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
index 25b29701..d20aec1c 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/Singbox/SingboxConfigTemplateService.cs
@@ -58,4 +58,40 @@ public partial class CoreConfigSingboxService
 
         return JsonUtils.Serialize(fullConfigTemplateNode);
     }
+
+    private void ApplyOutboundSendThrough()
+    {
+        var sendThrough = _config.CoreBasicItem.SendThrough?.TrimEx();
+        foreach (var outbound in _coreConfig.outbounds ?? [])
+        {
+            outbound.inet4_bind_address = ShouldApplySendThrough(outbound, sendThrough) ? sendThrough : null;
+        }
+    }
+
+    private static bool ShouldApplySendThrough(Outbound4Sbox outbound, string? sendThrough)
+    {
+        if (sendThrough.IsNullOrEmpty())
+        {
+            return false;
+        }
+
+        if (outbound.type is "direct" or "block" or "dns" or "selector" or "urltest")
+        {
+            return false;
+        }
+
+        if (!outbound.detour.IsNullOrEmpty())
+        {
+            return false;
+        }
+
+        var outboundAddress = outbound.server ?? string.Empty;
+
+        if (outboundAddress.Equals("localhost", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        return !IPAddress.TryParse(outboundAddress, out var address) || !IPAddress.IsLoopback(address);
+    }
 }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
index 1e72de41..fb8d92a7 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/CoreConfigV2rayService.cs
@@ -407,43 +407,4 @@ public partial class CoreConfigV2rayService(CoreConfigContext context)
     }
 
     #endregion public gen function
-
-    private void ApplyOutboundSendThrough()
-    {
-        var sendThrough = _config.CoreBasicItem.SendThrough?.TrimEx();
-        foreach (var outbound in _coreConfig.outbounds ?? [])
-        {
-            outbound.sendThrough = ShouldApplySendThrough(outbound, sendThrough) ? sendThrough : null;
-        }
-    }
-
-    private static bool ShouldApplySendThrough(Outbounds4Ray outbound, string? sendThrough)
-    {
-        if (sendThrough.IsNullOrEmpty())
-        {
-            return false;
-        }
-
-        if (outbound.protocol is "freedom" or "blackhole" or "dns" or "loopback")
-        {
-            return false;
-        }
-
-        if (outbound.streamSettings?.sockopt?.dialerProxy.IsNullOrEmpty() == false)
-        {
-            return false;
-        }
-
-        var outboundAddress = outbound.settings?.servers?.FirstOrDefault()?.address
-            ?? outbound.settings?.vnext?.FirstOrDefault()?.address
-            ?? outbound.settings?.address?.ToString()
-            ?? string.Empty;
-
-        if (outboundAddress.Equals("localhost", StringComparison.OrdinalIgnoreCase))
-        {
-            return false;
-        }
-
-        return !IPAddress.TryParse(outboundAddress, out var address) || !IPAddress.IsLoopback(address);
-    }
 }
diff --git a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
index db7c3f32..6e563f0f 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/V2ray/V2rayConfigTemplateService.cs
@@ -127,4 +127,43 @@ public partial class CoreConfigV2rayService
 
         return JsonUtils.Serialize(fullConfigTemplateNode);
     }
+
+    private void ApplyOutboundSendThrough()
+    {
+        var sendThrough = _config.CoreBasicItem.SendThrough?.TrimEx();
+        foreach (var outbound in _coreConfig.outbounds ?? [])
+        {
+            outbound.sendThrough = ShouldApplySendThrough(outbound, sendThrough) ? sendThrough : null;
+        }
+    }
+
+    private static bool ShouldApplySendThrough(Outbounds4Ray outbound, string? sendThrough)
+    {
+        if (sendThrough.IsNullOrEmpty())
+        {
+            return false;
+        }
+
+        if (outbound.protocol is "freedom" or "blackhole" or "dns" or "loopback")
+        {
+            return false;
+        }
+
+        if (outbound.streamSettings?.sockopt?.dialerProxy.IsNullOrEmpty() == false)
+        {
+            return false;
+        }
+
+        var outboundAddress = outbound.settings?.servers?.FirstOrDefault()?.address
+                              ?? outbound.settings?.vnext?.FirstOrDefault()?.address
+                              ?? outbound.settings?.address?.ToString()
+                              ?? string.Empty;
+
+        if (outboundAddress.Equals("localhost", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        return !IPAddress.TryParse(outboundAddress, out var address) || !IPAddress.IsLoopback(address);
+    }
 }
diff --git a/v2rayN/v2rayN.slnx b/v2rayN/v2rayN.slnx
index 1550478b..4042dad1 100644
--- a/v2rayN/v2rayN.slnx
+++ b/v2rayN/v2rayN.slnx
@@ -16,6 +16,7 @@
   </Folder>
   <Project Path="AmazTool/AmazTool.csproj" />
   <Project Path="GlobalHotKeys/src/GlobalHotKeys/GlobalHotKeys.csproj" />
+  <Project Path="ServiceLib.Tests/ServiceLib.Tests.csproj" />
   <Project Path="ServiceLib/ServiceLib.csproj" />
   <Project Path="v2rayN.Desktop/v2rayN.Desktop.csproj" />
   <Project Path="v2rayN/v2rayN.csproj" />