From 515908773fbaa10e34e00b630afb95476c0ba879 Mon Sep 17 00:00:00 2001
From: snow flurry <snow@datagirl.xyz>
Date: Mon, 21 Mar 2022 19:58:54 -0700
Subject: [PATCH] Further "rebase" tun_netbsd against tun_openbsd

Cleaning out some stuff from the older version of wireguard-go.
---
 tun/tun_netbsd.go | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/tun/tun_netbsd.go b/tun/tun_netbsd.go
index a5bc9db..0a24ed0 100644
--- a/tun/tun_netbsd.go
+++ b/tun/tun_netbsd.go
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: MIT
  *
- * Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
+ * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
  */
 
 package tun
@@ -8,7 +8,6 @@ package tun
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"sync"
@@ -26,11 +25,7 @@ type ifreq_mtu struct {
 	Pad0 [12]byte
 }
 
-const (
-	_TUNGIFHEAD = 0x40047441
-	_TUNSIFMODE = 0x80047458
-	_TUNSIFHEAD = 0x80047442
-)
+const _TUNSIFHEAD = 0x80047442
 
 type NativeTun struct {
 	name		string
@@ -106,16 +101,6 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
 	}
 }
 
-func errorIsEBUSY(err error) bool {
-	if pe, ok := err.(*os.PathError); ok {
-		err = pe.Err
-	}
-	if errno, ok := err.(syscall.Errno); ok && errno == syscall.EBUSY {
-		return true
-	}
-	return false
-}
-
 func CreateTUN(name string, mtu int) (Device, error) {
 	ifIndex := -1
 	if name != "tun" {
@@ -131,7 +116,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
 	if ifIndex != -1 {
 		tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0)
 	} else {
-		for ifIndex = 0; ifIndex < 256; ifIndex += 1 {
+		for ifIndex = 0; ifIndex < 256; ifIndex++ {
 			tunfile, err = os.OpenFile(fmt.Sprintf("/dev/tun%d", ifIndex), unix.O_RDWR, 0)
 			if err == nil || !errors.Is(err, syscall.EBUSY) {
 				break
@@ -175,7 +160,7 @@ func CreateTUN(name string, mtu int) (Device, error) {
 	if err == nil && name == "tun" {
 		fname := os.Getenv("WG_TUN_NAME_FILE")
 		if fname != "" {
-			ioutil.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0400)
+			os.WriteFile(fname, []byte(tun.(*NativeTun).name+"\n"), 0o400)
 		}
 	}
 
@@ -289,7 +274,7 @@ func (tun *NativeTun) Flush() error {
 
 func (tun *NativeTun) Close() error {
 	var err1, err2 error
-	tun.closeOnce.Do(func () {
+	tun.closeOnce.Do(func() {
 		err1 = tun.tunFile.Close()
 		if tun.routeSocket != -1 {
 			unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
@@ -315,7 +300,6 @@ func (tun *NativeTun) setMTU(n int) error {
 		unix.SOCK_DGRAM,
 		0,
 	)
-
 	if err != nil {
 		return err
 	}
@@ -350,7 +334,6 @@ func (tun *NativeTun) MTU() (int, error) {
 		unix.SOCK_DGRAM,
 		0,
 	)
-
 	if err != nil {
 		return 0, err
 	}