From 6849e26ee75bde87e146396d4b4f89633798da7a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Mon, 3 Aug 2026 18:42:55 +0800
Subject: [PATCH] tailscale: Fix system interface network category on Windows

---
 go.mod                                   |  2 +-
 protocol/tailscale/tun_device_windows.go | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/go.mod b/go.mod
index 1ac1b1e2..62fe76eb 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ require (
 	github.com/coder/websocket v1.8.14
 	github.com/cretz/bine v0.2.0
 	github.com/database64128/tfo-go/v2 v2.3.2
+	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa
 	github.com/go-chi/chi/v5 v5.2.5
 	github.com/go-chi/render v1.0.3
 	github.com/godbus/dbus/v5 v5.2.2
@@ -73,7 +74,6 @@ require (
 	github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6 // indirect
 	github.com/database64128/netx-go v0.1.1 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect
 	github.com/dgrijalva/jwt-go/v4 v4.0.0-preview1 // indirect
 	github.com/ebitengine/purego v0.10.0 // indirect
 	github.com/florianl/go-nfqueue/v2 v2.0.2 // indirect
diff --git a/protocol/tailscale/tun_device_windows.go b/protocol/tailscale/tun_device_windows.go
index 8c9e87ce..37f813cb 100644
--- a/protocol/tailscale/tun_device_windows.go
+++ b/protocol/tailscale/tun_device_windows.go
@@ -11,6 +11,9 @@ import (
 	singTun "github.com/sagernet/sing-tun"
 	"github.com/sagernet/sing/common/logger"
 	wgTun "github.com/sagernet/wireguard-go/tun"
+
+	"github.com/dblohm7/wingoes/com"
+	"golang.org/x/sys/windows/svc"
 )
 
 type tunDeviceAdapter struct {
@@ -21,7 +24,23 @@ type tunDeviceAdapter struct {
 	closeOnce sync.Once
 }
 
-func newTunDeviceAdapter(tun singTun.Tun, mtu int, _ logger.ContextLogger) (wgTun.Device, error) {
+var comRuntimeOnce sync.Once
+
+func newTunDeviceAdapter(tun singTun.Tun, mtu int, contextLogger logger.ContextLogger) (wgTun.Device, error) {
+	// wgengine/router/osrouter/ifconfig_windows.go setPrivateNetwork assumes COM
+	// is initialized process-wide, which upstream performs only in tailscaled's
+	// main package; library consumers must do it themselves.
+	comRuntimeOnce.Do(func() {
+		processType := com.ConsoleApp
+		isService, serviceErr := svc.IsWindowsService()
+		if serviceErr == nil && isService {
+			processType = com.Service
+		}
+		err := com.StartRuntime(processType)
+		if err != nil {
+			contextLogger.Warn("initialize COM runtime: ", err)
+		}
+	})
 	winTun, ok := tun.(singTun.WinTun)
 	if !ok {
 		return nil, errors.New("not a windows tun device")