From 3b33b0cb176ae74fac25796640d09d312ca9c140 Mon Sep 17 00:00:00 2001
From: Karel Slany <karel.slany@nic.cz>
Date: Fri, 27 May 2016 15:38:21 +0200
Subject: [PATCH] Fall back to TCP when receiving a valid BADCOOKIE response.
---
modules/cookies/cookies.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/modules/cookies/cookies.c b/modules/cookies/cookies.c
index 302565deb..3c972db42 100644
--- a/modules/cookies/cookies.c
+++ b/modules/cookies/cookies.c
@@ -348,7 +348,14 @@ static int check_response(knot_layer_t *ctx, knot_pkt_t *pkt)
DEBUG_MSG(NULL, "%s\n", "cookie_cached");
kr_cache_txn_commit(&txn);
}
+ }
+ uint16_t rcode = knot_pkt_get_ext_rcode(pkt);
+ if (rcode == KNOT_RCODE_BADCOOKIE) {
+ /* TODO -- Fall back to TCP after a limited number of retries. */
+ DEBUG_MSG(NULL, "%s'n", "falling back to TCP");
+ qry->flags |= QUERY_TCP;
+ return KNOT_STATE_PRODUCE;
}
print_packet_dflt(pkt);
--
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