resolved: fix single-label resolution over DNS

Fixes: #23494 (when ResolveUnicastSingleLabel=yes)
2022-08-02 19:21:46 +02:00
parent 675a644de2
commit ff0a5070d4
1 changed files with 5 additions and 0 deletions
@@ -692,6 +692,11 @@ DnsScopeMatch dns_scope_good_domain(
                if (has_search_domains && dns_name_is_single_label(domain))
                        return DNS_SCOPE_YES_BASE + 1;

+                /* If ResolveUnicastSingleLabel=yes and the query is single-label, then bump match result
+                   to prevent LLMNR monopoly among candidates. */
+                if (s->manager->resolve_unicast_single_label && dns_name_is_single_label(domain))
+                        return DNS_SCOPE_YES_BASE + 1;
+
                /* Let's return the number of labels in the best matching result */
                if (n_best >= 0) {
                        assert(n_best <= DNS_SCOPE_YES_END - DNS_SCOPE_YES_BASE);