fix Msg.Used TTL must be zero (#1280)

* fix Msg.Used RRset exists (value dependent -- with rdata) TTL must be zero * Used(): change ttl using Header()
miekg · Jul 18, 2021 · af0c865 · af0c865
1 parent c23d8b3
commit af0c865
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/update.go b/update.go
@@ -32,7 +32,9 @@ func (u *Msg) Used(rr []RR) {
 		u.Answer = make([]RR, 0, len(rr))
 	}
 	for _, r := range rr {
-		r.Header().Class = u.Question[0].Qclass
+		hdr := r.Header()
+		hdr.Class = u.Question[0].Qclass
+		hdr.Ttl = 0
 		u.Answer = append(u.Answer, r)
 	}
 }

diff --git a/update_test.go b/update_test.go
@@ -135,7 +135,7 @@ func TestPreReqAndRemovals(t *testing.T) {
 name_used.	0	CLASS255	ANY	
 name_not_used.	0	NONE	ANY	
 rrset_used1.	0	CLASS255	A	
-rrset_used2.	3600	IN	A	127.0.0.1
+rrset_used2.	0	IN	A	127.0.0.1
 rrset_not_used.	0	NONE	A	
 
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