From c4b43e35a772305858e610d879c2b9d47f4d9866 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 7 Feb 2019 18:24:28 +0100
Subject: wintun: add FlushInterface stub

---
 tun/tun_windows.go           |  5 +++++
 tun/wintun/wintun_windows.go | 17 +++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/tun/tun_windows.go b/tun/tun_windows.go
index 6449974..5f4f22a 100644
--- a/tun/tun_windows.go
+++ b/tun/tun_windows.go
@@ -65,6 +65,11 @@ func CreateTUN(ifname string) (TUNDevice, error) {
 		// Set interface name. (Ignore errors.)
 		wt.SetInterfaceName(ifname)
 	}
+	err = wt.FlushInterface()
+	if err != nil {
+		wt.DeleteInterface(0)
+		return nil, err
+	}
 
 	signalNameUTF16, err := windows.UTF16PtrFromString(wt.SignalEventName())
 	if err != nil {
diff --git a/tun/wintun/wintun_windows.go b/tun/wintun/wintun_windows.go
index 6adbb94..b7d84fa 100644
--- a/tun/wintun/wintun_windows.go
+++ b/tun/wintun/wintun_windows.go
@@ -322,9 +322,18 @@ func (wintun *Wintun) DeleteInterface(hwndParent uintptr) (bool, bool, error) {
 	return false, false, nil
 }
 
-///
-/// checkReboot checks device install parameters if a system reboot is required.
-///
+//
+// FlushInterface removes all properties from the interface and gives it only a very
+// vanilla IPv4 and IPv6 configuration with no addresses of any sort assigned.
+//
+func (wintun *Wintun) FlushInterface() error {
+	//TODO: implement me!
+	return nil
+}
+
+//
+// checkReboot checks device install parameters if a system reboot is required.
+//
 func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.SP_DEVINFO_DATA) (bool, error) {
 	devInstallParams, err := deviceInfoSet.GetDeviceInstallParams(deviceInfoData)
 	if err != nil {
@@ -458,4 +467,4 @@ func (wintun *Wintun) SignalEventName() string {
 
 func (wintun *Wintun) DataFileName() string {
 	return fmt.Sprintf("\\\\.\\Global\\WINTUN_DEVICE_%s", guid.ToString((*windows.GUID)(wintun)))
-}
\ No newline at end of file
+}
-- 
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