From de7ecc571b9ea81d5cad97e339e84f8084352741 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Fri, 4 May 2018 21:11:38 +0200
Subject: tun: allow darwin to auto assign names

---
 tun_darwin.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'tun_darwin.go')

diff --git a/tun_darwin.go b/tun_darwin.go
index a03347f..4d9b06d 100644
--- a/tun_darwin.go
+++ b/tun_darwin.go
@@ -46,9 +46,11 @@ var sockaddrCtlSize uintptr = 32
 
 func CreateTUN(name string) (TUNDevice, error) {
 	ifIndex := -1
-	fmt.Sscanf(name, "utun%d", &ifIndex)
-	if ifIndex < 0 {
-		return nil, fmt.Errorf("error parsing interface name %s, must be utun[0-9]+", name)
+	if (name != "utun") {
+		fmt.Sscanf(name, "utun%d", &ifIndex)
+		if ifIndex < 0 {
+			return nil, fmt.Errorf("Interface name must be utun[0-9]*")
+		}
 	}
 
 	fd, err := unix.Socket(unix.AF_SYSTEM, unix.SOCK_DGRAM, 2)
-- 
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