SRV type

[ardarico]

Hi,

I am trying to handle SRV type queries, such as

dig @127.0.0.1 -p 53 instance._service_type -t srv

I noticed that packet.js includes an [SRV description], but does not recognize Packet.TYPE.SRV. Thus, I added

SRV : 0x21,

to the Packet.TYPE definition, and now the server correctly decodes the query. However, something is wrong in the answer:

Samsung:Downloads micheleamoretti$ dig @127.0.0.1 -p 53 6gkzwgjz._iot._udp -t srv
;; Warning: Message parser reports malformed message packet.

; <<>> DiG 9.10.6 <<>> @127.0.0.1 -p 53 6gkzwgjz._iot._udp -t srv
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20964
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: Message has 6 extra bytes at end

;; QUESTION SECTION:
;6gkzwgjz._iot._udp. IN SRV

;; Query time: 9 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Jun 25 14:55:53 CEST 2020
;; MSG SIZE rcvd: 72

What is the cause of that WARNING?

My server code creates the response in this way:

response.header.qr = 1;
response.header.ra = 1;
response.additionals = [];
if (domains[query])
{
response.answers.push({
name: query,
type: Packet.TYPE.SRV,
class: Packet.CLASS.IN,
ttl: 100,
target: domains[query],
port: 8080
});
}