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Code Issues Releases Wiki Activity

wintun: Refactor network registry key name generation

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-03-07 15:34:34 +01:00 committed by Jason A. Donenfeld
parent 11f5780250
commit 9b22255cad
1 changed files with 18 additions and 22 deletions
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40
tun/wintun/wintun_windows.go
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@ -229,7 +229,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
// Install interfaces if any.
devInfoList.CallClassInstaller(setupapi.DIF_INSTALLINTERFACES, deviceData)
var ifid *windows.GUID
var wintun *Wintun
var rebootRequired bool
// Install the device.
@ -240,10 +240,10 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
rebootRequired = true
}
// Get network interface ID from registry. DIF_INSTALLDEVICE returns almost immediately,
// while the device installation continues in the background. It might take a while, before
// all registry keys and values are populated.
getInterfaceID := func() (*windows.GUID, error) {
// Get network interface. DIF_INSTALLDEVICE returns almost immediately, while the device
// installation continues in the background. It might take a while, before all registry
// keys and values are populated.
getInterface := func() (*Wintun, error) {
// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
keyDev, err := devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.READ)
if err != nil {
@ -267,7 +267,8 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
return nil, fmt.Errorf("NetCfgInstanceId registry value is not a GUID (expected: \"{...}\", provided: \"%v\")", value)
}
keyNetName := fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), value)
wintun := (*Wintun)(ifid)
keyNetName := wintun.GetNetRegKeyName()
keyNet, err := registry.OpenKey(registry.LOCAL_MACHINE, keyNetName, registry.QUERY_VALUE)
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
@ -293,11 +294,11 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
return nil, fmt.Errorf("Interface name registry value is not REG_SZ or REG_EXPAND_SZ (expected: %v or %v, provided: %v)", registry.SZ, registry.EXPAND_SZ, valueType)
}
// TUN interface is ready. (As far as we need it.)
return ifid, nil
// TUN interface is ready. (As much as we need it.)
return wintun, nil
}
for numAttempts := 0; numAttempts < 30; numAttempts++ {
ifid, err = getInterfaceID()
wintun, err = getInterface()
if err != nil {
if errWin, ok := err.(syscall.Errno); ok && errWin == windows.ERROR_FILE_NOT_FOUND {
// Wait and retry. TODO: Wait for a cancellable event instead.
@ -311,7 +312,7 @@ func CreateInterface(description string, hwndParent uintptr) (*Wintun, bool, err
}
if err == nil {
return (*Wintun)(ifid), rebootRequired, nil
return wintun, rebootRequired, nil
}
// The interface failed to install, or the interface ID was unobtainable. Clean-up.
@ -432,9 +433,9 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
// GetInterfaceName returns network interface name.
//
func (wintun *Wintun) GetInterfaceName() (string, error) {
key, err := wintun.openNetRegKey(registry.QUERY_VALUE)
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.GetNetRegKeyName(), registry.QUERY_VALUE)
if err != nil {
return "", err
return "", errors.New("Network-specific registry key open failed: " + err.Error())
}
defer key.Close()
@ -446,9 +447,9 @@ func (wintun *Wintun) GetInterfaceName() (string, error) {
// SetInterfaceName sets network interface name.
//
func (wintun *Wintun) SetInterfaceName(ifname string) error {
key, err := wintun.openNetRegKey(registry.SET_VALUE)
key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.GetNetRegKeyName(), registry.SET_VALUE)
if err != nil {
return err
return errors.New("Network-specific registry key open failed: " + err.Error())
}
defer key.Close()
@ -457,16 +458,11 @@ func (wintun *Wintun) SetInterfaceName(ifname string) error {
}
//
// openNetRegKey opens interface-specific network registry key.
// GetNetRegKeyName returns interface-specific network registry key name.
//
func (wintun *Wintun) openNetRegKey(access uint32) (registry.Key, error) {
func (wintun *Wintun) GetNetRegKeyName() string {
ifid := (*windows.GUID)(wintun)
key, err := registry.OpenKey(registry.LOCAL_MACHINE, fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), guid.ToString(ifid)), access)
if err != nil {
return 0, errors.New("Network-specific registry key open failed: " + err.Error())
}
return key, nil
return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Control\\Network\\%v\\%v\\Connection", guid.ToString(&deviceClassNetGUID), guid.ToString(ifid))
}
//