commit 16fb0dea8a6bd2b750ffd7f706401125f18d222a
from: Oliver Lowe <o@olowe.co>
date: Fri Dec 17 08:36:58 2021 UTC

recursor: set more correct header bits in response

This is what quad9 and google's dns resolver do

commit - a7c06b85bf15297629c13f8aae6cf51c828119b2
commit + 16fb0dea8a6bd2b750ffd7f706401125f18d222a
blob - 22a93824298b83d275c54c8a58450244b4037ec9
blob + d452495bebba48c909a222b91c286b153ca7caed
--- cmd/recursor/recursor.go
+++ cmd/recursor/recursor.go
@@ -26,6 +26,7 @@ func handler(w dns.ResponseWriter, qmsg *dnsmessage.Me
 	var rmsg dnsmessage.Message
 	rmsg.Header.ID = qmsg.Header.ID
 	rmsg.Header.Response = true
+	rmsg.Header.RecursionAvailable = true
 	rmsg.Questions = qmsg.Questions
 
 	if reject, rc := shouldReject(qmsg); reject {
@@ -33,6 +34,7 @@ func handler(w dns.ResponseWriter, qmsg *dnsmessage.Me
 		w.WriteMsg(rmsg)
 		return
 	}
+	rmsg.RecursionDesired = true
 
 	q := qmsg.Questions[0]
 	cache.RLock()