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net/dns: use fallback resolvers as default if they are absent

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Otherwise we reset DNS configuration to empty after failing to collect
base OS configuration from dns.noopManager, e.g.

```
2025/05/08 05:48:08 wgengine: Reconfig: configuring DNS
2025/05/08 05:48:08 dns: Set: {DefaultResolvers:[] Routes:{cat-ray.ts.net.:[] ts.net.:[199.247.155.53 2620:111:8007::53]}+65arpa SearchDomains:[cat-ray.ts.net.] Hosts:50}
2025/05/08 05:48:08 health(warnable=dns-read-os-config-failed): error: Tailscale failed to fetch the DNS configuration of your device: getting OS base config is not supported
2025/05/08 05:48:08 health(warnable=dns): error: getting OS base config is not supported
2025/05/08 05:48:08 [v1] authReconfig: ra=false dns=true 0x00: getting OS base config is not supported
2025/05/08 05:48:08 [v1] authReconfig: ra=false dns=true 0x00: <nil>
```
This commit is contained in:
Anton Tolchanov
2025-05-05 09:59:49 +01:00
parent 16e1249eb7
commit c8deed69ae
1 changed files with 4 additions and 4 deletions
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8
net/dns/manager.go
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@@ -185,15 +185,15 @@ func (m *Manager) setLocked(cfg Config) error {
cfg.WriteToBufioWriter(w)
}))
if !cfg.hasDefaultResolvers() && len(m.forceFallbackResolvers) > 0 {
cfg.DefaultResolvers = m.forceFallbackResolvers
}
rcfg, ocfg, err := m.compileConfig(cfg)
if err != nil {
return err
}
if _, ok := rcfg.Routes["."]; !ok && len(m.forceFallbackResolvers) > 0 {
rcfg.Routes["."] = m.forceFallbackResolvers
}
m.logf("Resolvercfg: %v", logger.ArgWriter(func(w *bufio.Writer) {
rcfg.WriteToBufioWriter(w)
}))