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wintun: Detect if a foreign interface with the same name exists

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman
2019-02-07 22:02:51 +01:00
parent 043b7e8013
commit d87cbeeb2f
2 changed files with 50 additions and 7 deletions
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18
tun/tun_windows.go
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@@ -55,16 +55,26 @@ type nativeTun struct {
func CreateTUN(ifname string) (TUNDevice, error) {
// Does an interface with this name already exist?
wt, err := wintun.GetInterface(ifname, 0)
if wt == nil || err != nil {
if wt == nil {
// Interface does not exist or an error occured. Create one.
wt, _, err = wintun.CreateInterface("WireGuard Tunnel Adapter", 0)
if err != nil {
return nil, err
}
// Set interface name. (Ignore errors.)
wt.SetInterfaceName(ifname)
} else if err != nil {
// Foreign interface with the same name found.
// We could create a Wintun interface under a temporary name. But, should our
// proces die without deleting this interface first, the interface would remain
// orphaned.
return nil, err
}
err = wt.SetInterfaceName(ifname)
if err != nil {
wt.DeleteInterface(0)
return nil, err
}
err = wt.FlushInterface()
if err != nil {
wt.DeleteInterface(0)