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resolved: demote the fallback dns servers

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This softens the behavior originally introduced in eded61e410 to apply
only to the fallback dns servers.

The intent is that the global FallbackDNS (instead of DNS) can now be
used in conjunction with the per-link dns, providing a fallback behavior
without introducing a scope overlap.

References: eded61e410 (resolved: demote the global unicast scope, 2024-08-19)
This commit is contained in:
Ronan Pigott 2024-08-21 07:49:59 -07:00
parent 760fa203c2
commit d229e282d6
2 changed files with 7 additions and 2 deletions
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5
man/systemd-resolved.service.xml
View File

@ -219,8 +219,9 @@
is sent to all DNS servers that are configured on links with the <varname>DefaultRoute=</varname>
option set, as well as the globally configured DNS server.</para></listitem>
<listitem><para>If there is no link configured as <varname>DefaultRoute=</varname> and no global DNS
server configured, one of the compiled-in fallback DNS servers is used.</para></listitem>
<listitem><para>If there are no DNS servers configured on any link also configured as
<varname>DefaultRoute=</varname> and no global DNS server configured, one of the compiled-in fallback
DNS servers is used.</para></listitem>
<listitem><para>Otherwise the unicast DNS query fails, as no suitable DNS servers can be determined.
</para></listitem>

4
src/resolve/resolved-dns-scope.c
View File

@ -778,6 +778,10 @@ DnsScopeMatch dns_scope_good_domain(
if (!dns_scope_is_default_route(s))
return DNS_SCOPE_NO;
/* Prefer suitable per-link scopes where possible */
if (dns_server_is_fallback(dns_scope_get_dns_server(s)))
return DNS_SCOPE_LAST_RESORT;
return DNS_SCOPE_MAYBE;
}