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wintun: simplify rename logic

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This commit is contained in:
Jason A. Donenfeld 2019-08-28 19:31:20 -06:00
parent da28a3e9f3
commit e862131d3c
1 changed files with 4 additions and 5 deletions
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9
tun/wintun/wintun_windows.go
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@ -568,12 +568,8 @@ func (wintun *Wintun) InterfaceName() (string, error) {
func (wintun *Wintun) SetInterfaceName(ifname string) error {
const maxSuffix = 1000
availableIfname := ifname
setloop:
for i := 0; ; i++ {
err := nci.SetConnectionName(&wintun.cfgInstanceID, availableIfname)
if err == nil {
break
}
if err == windows.ERROR_DUP_NAME {
duplicateGuid, err2 := iphlpapi.InterfaceGUIDFromAlias(availableIfname)
if err2 == nil {
@ -589,13 +585,16 @@ setloop:
if err2 == nil {
err = nci.SetConnectionName(&wintun.cfgInstanceID, availableIfname)
if err == nil {
break setloop
break
}
}
break
}
}
}
if err == nil {
break
}
if i > maxSuffix || err != windows.ERROR_DUP_NAME {
return fmt.Errorf("NciSetConnectionName failed: %v", err)