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@ -7,12 +7,13 @@ package dns
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import (
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"fmt"
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"os/exec"
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"runtime"
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"strings"
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"syscall"
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"time"
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"github.com/tailscale/wireguard-go/tun"
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wgregistry "github.com/tailscale/wireguard-go/tun/wintun/registry"
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"golang.org/x/sys/windows"
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"golang.org/x/sys/windows/registry"
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"tailscale.com/types/logger"
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)
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@ -35,14 +36,76 @@ func newManager(mconfig ManagerConfig) managerImpl {
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}
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}
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// keyOpenTimeout is how long we wait for a registry key to
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// appear. For some reason, registry keys tied to ephemeral interfaces
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// can take a long while to appear after interface creation, and we
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// can end up racing with that.
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const keyOpenTimeout = time.Minute
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const (
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// keyOpenTimeout is how long we wait for a registry key to
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// appear. For some reason, registry keys tied to ephemeral interfaces
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// can take a long while to appear after interface creation, and we
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// can end up racing with that.
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keyOpenTimeout = time.Minute
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// REG_NOTIFY_CHANGE_NAME notifies the caller if a subkey is added or deleted.
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REG_NOTIFY_CHANGE_NAME uint32 = 0x00000001
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)
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func openKeyWait(k registry.Key, path string, access uint32, timeout time.Duration) (registry.Key, error) {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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deadline := time.Now().Add(timeout)
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pathSpl := strings.Split(path, "\\")
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for i := 0; ; i++ {
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keyName := pathSpl[i]
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isLast := i+1 == len(pathSpl)
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event, err := windows.CreateEvent(nil, 0, 0, nil)
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if err != nil {
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return 0, fmt.Errorf("windows.CreateEvent: %v", err)
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}
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defer windows.CloseHandle(event)
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var key registry.Key
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for {
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err = windows.RegNotifyChangeKeyValue(windows.Handle(k), false, REG_NOTIFY_CHANGE_NAME, event, true)
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if err != nil {
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return 0, fmt.Errorf("windows.RegNotifyChangeKeyValue: %v", err)
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}
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var accessFlags uint32
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if isLast {
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accessFlags = access
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} else {
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accessFlags = registry.NOTIFY
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}
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key, err = registry.OpenKey(k, keyName, accessFlags)
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if err == windows.ERROR_FILE_NOT_FOUND || err == windows.ERROR_PATH_NOT_FOUND {
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timeout := time.Until(deadline) / time.Millisecond
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if timeout < 0 {
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timeout = 0
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}
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s, err := windows.WaitForSingleObject(event, uint32(timeout))
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if err != nil {
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return 0, fmt.Errorf("windows.WaitForSingleObject: %v", err)
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}
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if s == uint32(windows.WAIT_TIMEOUT) { // windows.WAIT_TIMEOUT status const is misclassified as error in golang.org/x/sys/windows
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return 0, fmt.Errorf("timeout waiting for registry key")
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}
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} else if err != nil {
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return 0, fmt.Errorf("registry.OpenKey(%v): %v", path, err)
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} else {
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if isLast {
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return key, nil
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}
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defer key.Close()
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break
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}
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}
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k = key
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}
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}
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func setRegistryString(path, name, value string) error {
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key, err := wgregistry.OpenKeyWait(registry.LOCAL_MACHINE, path, registry.SET_VALUE, keyOpenTimeout)
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key, err := openKeyWait(registry.LOCAL_MACHINE, path, registry.SET_VALUE, keyOpenTimeout)
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if err != nil {
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return fmt.Errorf("opening %s: %w", path, err)
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}
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Aleksandar Pesic
4 years ago