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Allow split DNS configuration without requiring global nameservers

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Align behaviour of dns_config.restricted_nameservers to tailscale.

Tailscale allows split DNS configuration without requiring global nameservers.

In addition, as per [the docs](https://tailscale.com/kb/1054/dns/#using-dns-settings-in-the-admin-console):

> These nameservers also configure search domains for your devices

This commit aligns headscale to tailscale by:

 * honouring dns_config.restricted_nameservers regardless of whether any global resolvers are configured
 * adding a search domain for each restricted_nameserver
This commit is contained in:
Dominic Bevacqua 2023-01-23 11:34:12 +00:00 committed by Juan Font
parent 83a538cc95
commit 26edf24477
1 changed files with 22 additions and 24 deletions
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8
config.go
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@ -411,8 +411,8 @@ func GetDNSConfig() (*tailcfg.DNSConfig, string) {
} }
if viper.IsSet("dns_config.restricted_nameservers") { if viper.IsSet("dns_config.restricted_nameservers") {
if len(dnsConfig.Resolvers) > 0 {
dnsConfig.Routes = make(map[string][]*dnstype.Resolver) dnsConfig.Routes = make(map[string][]*dnstype.Resolver)
domains := []string{}
restrictedDNS := viper.GetStringMapStringSlice( restrictedDNS := viper.GetStringMapStringSlice(
"dns_config.restricted_nameservers", "dns_config.restricted_nameservers",
) )
@ -434,11 +434,9 @@ func GetDNSConfig() (*tailcfg.DNSConfig, string) {
} }
} }
dnsConfig.Routes[domain] = restrictedResolvers dnsConfig.Routes[domain] = restrictedResolvers
domains = append(domains, domain)
} }
} else { dnsConfig.Domains = domains
log.Warn().
Msg("Warning: dns_config.restricted_nameservers is set, but no nameservers are configured. Ignoring restricted_nameservers.")
}
} }
if viper.IsSet("dns_config.domains") { if viper.IsSet("dns_config.domains") {