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Fall back to normal recursion when mirror zone data is unavailable

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If transferring or loading a mirror zone fails, resolution should still
succeed by means of falling back to regular recursive queries.
Currently, though, if a slave zone is present in the zone table and not
loaded, a SERVFAIL response is generated.  Thus, mirror zones need
special handling in this regard.

Add a new dns_zt_find() flag, DNS_ZTFIND_MIRROR, and set it every time a
domain name is looked up rather than a zone itself.  Handle that flag in
dns_zt_find() in such a way that a mirror zone which is expired or not
yet loaded is ignored when looking up domain names, but still possible
to find when the caller wants to know whether the zone is configured.
This causes a fallback to recursion when mirror zone data is unavailable
without making unloaded mirror zones invisible to code checking a zone's
existence.
This commit is contained in:
Michał Kępień
2018-06-28 13:38:39 +02:00
parent e3160b27f7
commit 8d996fd79c
13 changed files with 134 additions and 9 deletions
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6
lib/ns/query.c
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@@ -1176,8 +1176,10 @@ query_getzonedb(ns_client_t *client, const dns_name_t *name,
/*%
* Find a zone database to answer the query.
*/
ztoptions = ((options & DNS_GETDB_NOEXACT) != 0) ?
DNS_ZTFIND_NOEXACT : 0;
ztoptions = DNS_ZTFIND_MIRROR;
if ((options & DNS_GETDB_NOEXACT) != 0) {
ztoptions |= DNS_ZTFIND_NOEXACT;
}
result = dns_zt_find(client->view->zonetable, name, ztoptions, NULL,
&zone);