Recursive Resolver returns TXT records from HNS root zone even if NS record is present

[pinheadmz]

Running an hsd full node, this bug can be toggled on and off by using unbound's resolver instead.

Example:

On-chain resource:

$ hsd-rpc getnameresource kiba_gateaux
{
  "records": [
    {
      "type": "GLUE4",
      "ns": "ns1.kiba_gateaux.",
      "address": "44.231.6.183"
    },
    {
      "type": "NS",
      "ns": "ns1.kiba_gateaux."
    },
    {
      "type": "TXT",
      "txt": [
        "fAi/2CG3ZOp0zVogpD/rkA8DkMgpFjwShfspJhujL1BOm"
      ]
    },
    {
      "type": "TXT",
      "txt": [
        "fApXxmmBOlxD0soZapm5fUZ+cNm3DEtc6hAf3qlrv65Aq"
      ]
    }
  ]
}

Unbound

hsd

--> dig @127.0.0.1 -p 5350 kiba_gateaux txt

; <<>> DiG 9.16.3 <<>> @127.0.0.1 -p 5350 kiba_gateaux txt
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 35434
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: daf70b0df009336e (echoed)
;; QUESTION SECTION:
;kiba_gateaux.                  IN      TXT

;; AUTHORITY SECTION:
kiba_gateaux.           3600    IN      SOA     a.misconfigured.powerdns.server. hostmaster.kiba_gateaux. 2020103002 10800 3600 604800 3600

;; SIG0 PSEUDOSECTION:
.                       0       ANY     SIG     0 253 0 0 20210106224327 20210106104327 15350 . FUhEtST8OCVWk0g56D7GQwdEya4G7CaHXUvh2om5dvVDr8aGT6SpI1tQ GLXnyh6VIy99kg3Y+Kc6e5tHv5VF0Q==

;; Query time: 543 msec
;; SERVER: 127.0.0.1#5350(127.0.0.1)
;; WHEN: Wed Jan 06 11:43:27 EST 2021
;; MSG SIZE  rcvd: 225

BNS

hsd --rs-no-unbound

--> dig @127.0.0.1 -p 5350 kiba_gateaux txt

; <<>> DiG 9.16.3 <<>> @127.0.0.1 -p 5350 kiba_gateaux txt
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23597
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 5a698d897bd4b209 (echoed)
;; QUESTION SECTION:
;kiba_gateaux.                  IN      TXT

;; ANSWER SECTION:
kiba_gateaux.           21600   IN      TXT     "fAi/2CG3ZOp0zVogpD/rkA8DkMgpFjwShfspJhujL1BOm"
kiba_gateaux.           21600   IN      TXT     "fApXxmmBOlxD0soZapm5fUZ+cNm3DEtc6hAf3qlrv65Aq"

;; SIG0 PSEUDOSECTION:
.                       0       ANY     SIG     0 253 0 0 20210106224315 20210106104315 15350 . qMDd3WBUpH/Qc2CHACOpzgn+pDQJ9tp8s/rMObUISf0br55y5yrd4uAl RinvDIDF95nGXQdb8IKzExIW6aXFBw==

;; Query time: 86 msec
;; SERVER: 127.0.0.1#5350(127.0.0.1)
;; WHEN: Wed Jan 06 11:43:15 EST 2021
;; MSG SIZE  rcvd: 263