From bfb7e5d4fd03c868eb694cb5514a8a89b34a5d1f Mon Sep 17 00:00:00 2001
From: Remi Gacogne <remi.gacogne@powerdns.com>
Date: Tue, 13 Dec 2016 16:21:17 +0100
Subject: [PATCH] rec: Set the result to NoError before calling `preresolve`

Otherwise `rq.rcode` needs to be set explicitly when handling the
query from `preresolve`, which is not documented and wasn't the case
before.

(cherry picked from commit ef3b6cd7719e968364f6ad7692ff4287829f37f1)
---
 pdns/pdns_recursor.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pdns/pdns_recursor.cc b/pdns/pdns_recursor.cc
index 6663fd24cd..5e73fbac32 100644
--- a/pdns/pdns_recursor.cc
+++ b/pdns/pdns_recursor.cc
@@ -739,7 +739,8 @@ void startDoResolve(void *p)
     bool variableAnswer = false;
     bool shouldNotValidate = false;
 
-    int res;
+    /* preresolve expects res (dq.rcode) to be set to RCode::NoError by default */
+    int res = RCode::NoError;
     DNSFilterEngine::Policy appliedPolicy;
     DNSRecord spoofed;
     if(dc->d_mdp.d_qtype==QType::ANY && !dc->d_tcp && g_anyToTcp) {
-- 
2.47.2