layer/iterate: some additional processing for referrals

diff --git a/lib/layer/iterate.c b/lib/layer/iterate.c
index e88a234d3f32ac3af398127495ba997ef7fe1653..fff49376bdd6980bd192758f8f244836f618dd65 100644 (file)
--- a/lib/layer/iterate.c
+++ b/lib/layer/iterate.c
@@ -471,6 +471,18 @@ static int process_referral_answer(knot_pkt_t *pkt, struct kr_request *req)
        if (state != kr_ok()) {
                return KR_STATE_FAIL;
        }
+       struct kr_query *query = req->current_query;
+       if (!(query->flags & QUERY_CACHED)) {
+               /* If not cached (i.e. got from upstream)
+                * make sure that this is not an authoritative answer
+                * (even with AA=1) for other layers.
+                * There can be answers with AA=1,
+                * empty answer section and NS in authority.
+                * Clearing of AA prevents them from
+                * caching in the packet cache.
+                * If packet already cached, don't touch him. */
+               knot_wire_clear_aa(pkt->wire);
+       }
        state = pick_authority(pkt, req, false);
        return state == kr_ok() ? KR_STATE_DONE : KR_STATE_FAIL;
 }