From 18a515a5eb146442e5552b2954481905d2903a32 Mon Sep 17 00:00:00 2001
From: ginuerzh <ginuerzh@gmail.com>
Date: Mon, 3 Feb 2020 21:05:42 +0800
Subject: [PATCH] fix tun for darwin

---
 cmd/gost/route.go | 1 +
 tuntap.go         | 1 +
 tuntap_darwin.go  | 7 ++++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/cmd/gost/route.go b/cmd/gost/route.go
index ac840cf..4032884 100644
--- a/cmd/gost/route.go
+++ b/cmd/gost/route.go
@@ -450,6 +450,7 @@ func (r *route) GenRouters() ([]router, error) {
 			cfg := gost.TunConfig{
 				Name:    node.Get("name"),
 				Addr:    node.Get("net"),
+				Peer:    node.Get("peer"),
 				MTU:     node.GetInt("mtu"),
 				Routes:  tunRoutes,
 				Gateway: node.Get("gw"),
diff --git a/tuntap.go b/tuntap.go
index 43ed893..d490a58 100644
--- a/tuntap.go
+++ b/tuntap.go
@@ -48,6 +48,7 @@ type IPRoute struct {
 type TunConfig struct {
 	Name    string
 	Addr    string
+	Peer    string // peer addr of point-to-point on MacOS
 	MTU     int
 	Routes  []IPRoute
 	Gateway string
diff --git a/tuntap_darwin.go b/tuntap_darwin.go
index 51cdd9e..ffe2ac7 100644
--- a/tuntap_darwin.go
+++ b/tuntap_darwin.go
@@ -29,7 +29,12 @@ func createTun(cfg TunConfig) (conn net.Conn, itf *net.Interface, err error) {
 		mtu = DefaultMTU
 	}
 
-	cmd := fmt.Sprintf("ifconfig %s inet %s mtu %d up", ifce.Name(), cfg.Addr, mtu)
+	peer := cfg.Peer
+	if peer == "" {
+		peer = ip.String()
+	}
+	cmd := fmt.Sprintf("ifconfig %s inet %s %s mtu %d up",
+		ifce.Name(), cfg.Addr, peer, mtu)
 	log.Log("[tun]", cmd)
 	args := strings.Split(cmd, " ")
 	if er := exec.Command(args[0], args[1:]...).Run(); er != nil {