From ac898bb35afde34a383f72726c2818d082933e8d Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 4 May 2018 21:20:19 +0200
Subject: [PATCH] tun: print automatically assigned interface name to stdout

This way scripts know what process they just started.
---
 tun_darwin.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tun_darwin.go b/tun_darwin.go
index 4d9b06d..5514563 100644
--- a/tun_darwin.go
+++ b/tun_darwin.go
@@ -98,7 +98,13 @@ func CreateTUN(name string) (TUNDevice, error) {
 		return nil, fmt.Errorf("SYS_CONNECT: %v", errno)
 	}
 
-	return CreateTUNFromFile(os.NewFile(uintptr(fd), ""))
+	tun, err := CreateTUNFromFile(os.NewFile(uintptr(fd), ""))
+
+	if err == nil && name == "utun" {
+		fmt.Printf("OS assigned interface: %s\n", tun.(*NativeTun).name)
+	}
+
+	return tun, err
 }
 
 func CreateTUNFromFile(file *os.File) (TUNDevice, error) {