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wintun: try multiple names until one isn't a duplicate

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This commit is contained in:
Jason A. Donenfeld 2019-08-22 08:52:59 +02:00
parent 68fea631d8
commit 3cedc22d7b
1 changed files with 12 additions and 4 deletions
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16
tun/wintun/wintun_windows.go
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@ -373,7 +373,7 @@ func CreateInterface(description string, requestedGUID *windows.GUID) (wintun *W
// Wait for TCP/IP interface registry key to emerge.
tcpipInterfaceRegKey, err := registryEx.OpenKeyWait(
registry.LOCAL_MACHINE,
tcpipInterfaceRegKeyName, registry.QUERY_VALUE | registry.SET_VALUE,
tcpipInterfaceRegKeyName, registry.QUERY_VALUE|registry.SET_VALUE,
waitForRegistryTimeout)
if err != nil {
err = fmt.Errorf("OpenKeyWait(HKLM\\%s) failed: %v", tcpipInterfaceRegKeyName, err)
@ -522,9 +522,17 @@ func (wintun *Wintun) InterfaceName() (string, error) {
// SetInterfaceName sets name of the Wintun interface.
func (wintun *Wintun) SetInterfaceName(ifname string) error {
err := nci.SetConnectionName(&wintun.cfgInstanceID, ifname)
if err != nil {
return fmt.Errorf("NciSetConnectionName failed: %v", err)
const maxSuffix = 1000
availableIfname := ifname
for i := 0; ; i++ {
err := nci.SetConnectionName(&wintun.cfgInstanceID, availableIfname)
if err == nil {
break
}
if i > maxSuffix || err != windows.ERROR_DUP_NAME {
return fmt.Errorf("NciSetConnectionName failed: %v", err)
}
availableIfname = fmt.Sprintf("%s %d", ifname, i+1)
}
// TODO: This should use NetSetup2 so that it doesn't get unset.