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net/dns: [win] respond with SERVFAIL queries when no resolvers

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Currently we forward unmatched queries to the default resolver on
Windows. This results in duplicate queries being issued to the same
resolver which is just wasted.

Updates #1659

Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali 2022-08-12 12:47:25 -07:00 committed by Maisem Ali
parent 548fa63e49
commit 1cff719015
1 changed files with 3 additions and 4 deletions
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7
net/dns/manager.go
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@ -214,12 +214,11 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
rcfg.Routes = routes
ocfg.Nameservers = []netip.Addr{cfg.serviceIP()}
// If the OS can't do native split-dns, read out the underlying
// resolver config and blend it into our config.
if m.os.SupportsSplitDNS() {
ocfg.MatchDomains = cfg.matchDomains()
}
if !m.os.SupportsSplitDNS() || isWindows {
} else {
// If the OS can't do native split-dns, read out the underlying
// resolver config and blend it into our config.
bcfg, err := m.os.GetBaseConfig()
if err != nil {
health.SetDNSOSHealth(err)