bug!!!

[jzp820927]

netstat -lunp|egrep 63
udp 0 0 0.0.0.0:63 0.0.0.0:* 19550/dns-over-http

dig www.facebook.com -p 63
;; Warning: Message parser reports malformed message packet.

; <<>> DiG 9.10.3-P4-Ubuntu <<>> www.facebook.com -p 63
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33103
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: Message has 43 extra bytes at end

;; QUESTION SECTION:
;www.facebook.com. IN A

;; Query time: 634 msec
;; SERVER: 127.0.0.1#63(127.0.0.1)
;; WHEN: Tue Jun 21 18:45:34 CST 2016
;; MSG SIZE rcvd: 105

[wrouesnel]

Thanks for the report. This one is a little odd - by default Google gives you quite a bit of information back, which you can add to DNS replies (and I do) but dig tends not to like it. By and large, it seems to keep working as a practical resolver.

[jzp820927]

$ nslookup

set port=63
www.google.com
Server: 127.0.0.1
Address: 127.0.0.1#63

Non-authoritative answer:
Name: www.google.com
Address: 64.233.189.105
Name: www.google.com
Address: 64.233.189.106
Name: www.google.com
Address: 64.233.189.99
Name: www.google.com
Address: 64.233.189.104
Name: www.google.com
Address: 64.233.189.147
Name: www.google.com
Address: 64.233.189.103

www.facebook.com
;; Warning: Message parser reports malformed message packet.
Server: 127.0.0.1
Address: 127.0.0.1#63

Non-authoritative answer:
*** Can't find www.facebook.com: No answer

[mattm404]

This is because it cannot handle CNAME type answers.

This hack just ignores them:

@@ -259,7 +174,10 @@ func proxy(addr string, w dns.ResponseWriter, req *dns.Msg) {
        // Parse google RRs to DNS RRs
        answers := []dns.RR{}
        for _, a := range dnsResp.Answer {
-               answers = append(answers, NewRR(a))
+               log.Debugln(a)
+               if (a.Type != 5) {
+                       answers = append(answers, NewRR(a))
+               }
        }

        // Parse google RRs to DNS RRs

[jzp820927]

thx!

[jzp820927]

nslookup www.facebook.com
Server: 127.0.0.1
Address: 127.0.0.1#53

Non-authoritative answer:
Name: star-mini.c10r.facebook.com
Address: 31.13.95.36
Name: star-mini.c10r.facebook.com
Address: 2a03:2880:f102:83:face:b00c:0:25de

ping www.facebook.com
ping: unknown host www.facebook.com