From fe89bbded22d3d6ccda685d11828ec696510bc03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Wed, 15 Mar 2023 21:47:16 +0800
Subject: [PATCH] Create gVisor stack by default in NE

---
 stack.go                |  3 ++-
 stack_default.go        |  7 +++++++
 stack_default_darwin.go | 10 ++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 stack_default.go
 create mode 100644 stack_default_darwin.go

diff --git a/stack.go b/stack.go
index 1eed543..83612a9 100644
--- a/stack.go
+++ b/stack.go
@@ -24,6 +24,7 @@ type StackOptions struct {
 	UDPTimeout             int64
 	Handler                Handler
 	Logger                 logger.Logger
+	UnderPlatform          bool
 }
 
 func NewStack(
@@ -32,7 +33,7 @@ func NewStack(
 ) (Stack, error) {
 	switch stack {
 	case "":
-		return NewSystem(options)
+		return defaultStack(options)
 	case "gvisor":
 		return NewGVisor(options)
 	case "system":
diff --git a/stack_default.go b/stack_default.go
new file mode 100644
index 0000000..28de3da
--- /dev/null
+++ b/stack_default.go
@@ -0,0 +1,7 @@
+//go:build !darwin
+
+package tun
+
+func defaultStack(options StackOptions) (Stack, error) {
+	return NewSystem(options)
+}
diff --git a/stack_default_darwin.go b/stack_default_darwin.go
new file mode 100644
index 0000000..530ea2b
--- /dev/null
+++ b/stack_default_darwin.go
@@ -0,0 +1,10 @@
+package tun
+
+func defaultStack(options StackOptions) (Stack, error) {
+	if options.UnderPlatform {
+		// Apple Network Extension conflicts with system stack.
+		return NewGVisor(options)
+	} else {
+		return NewSystem(options)
+	}
+}