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net/dns: disable DNS registration for Tailscale interface on Windows

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We already disable dynamic updates by setting DisableDynamicUpdate to 1 for the Tailscale interface.
However, this does not prevent non-dynamic DNS registration from happening when `ipconfig /registerdns`
runs and in similar scenarios. Notably, dns/windowsManager.SetDNS runs `ipconfig /registerdns`,
triggering DNS registration for all interfaces that do not explicitly disable it.

In this PR, we update dns/windowsManager.disableDynamicUpdates to also set RegistrationEnabled to 0.

Fixes #13411

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl 2024-09-07 12:43:34 -05:00 committed by Nick Khyl
parent 2b0d0ddf5d
commit 4dfde7bffc
1 changed files with 3 additions and 0 deletions
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3
net/dns/manager_windows.go
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@ -469,6 +469,9 @@ func (m *windowsManager) disableDynamicUpdates() error {
}
defer k.Close()
if err := k.SetDWordValue("RegistrationEnabled", 0); err != nil {
return err
}
if err := k.SetDWordValue("DisableDynamicUpdate", 1); err != nil {
return err
}