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net/dns,docs/windows/policy,util/syspolicy: register Tailscale IP addresses in AD DNS if required by policy

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In this PR, we make DNS registration behavior configurable via the EnableDNSRegistration policy setting.
We keep the default behavior unchanged, but allow admins to either enforce DNS registration and dynamic
DNS updates for the Tailscale interface, or prevent Tailscale from modifying the settings configured in
the network adapter's properties or by other means.

Updates #14917

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl
2025-05-08 18:38:48 -05:00
committed by Nick Khyl
parent 2c16fcaa06
commit fb188c5b53
5 changed files with 121 additions and 12 deletions
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7
util/syspolicy/syspolicy.go
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@@ -90,6 +90,13 @@ func GetPreferenceOption(name Key) (setting.PreferenceOption, error) {
return getCurrentPolicySettingValue(name, setting.ShowChoiceByPolicy)
}
// GetPreferenceOptionOrDefault is like [GetPreferenceOption], but allows
// specifying a default value to return if the policy setting is not configured.
// It can be used in situations where "user-decides" is not the default.
func GetPreferenceOptionOrDefault(name Key, defaultValue setting.PreferenceOption) (setting.PreferenceOption, error) {
return getCurrentPolicySettingValue(name, defaultValue)
}
// GetVisibility loads a policy from the registry that can be managed
// by an enterprise policy management system and describes show/hide decisions
// for UI elements. The registry value should be a string set to "show" (return