Pack() failed: dns: nil rr

[denisu]

Some DNS requests appear to be "stuck" due to an error from dingo.

To reproduce:
dig 122.141.76.110.in-addr.arpa

Error from dingo:
Pack() failed: dns: nil rr

Other public resolvers just return no answer for that query. Dingo should do the same, because the current behavior prevents certain applications to work (eg. KakaoTalk on Mac).

[pforemski]

Hi, thanks for reporting, but this works for me (both for A and PTR queries):

pjf@pjftab:~$ dig 122.141.76.110.in-addr.arpa @127.0.0.1

; <<>> DiG 9.10.3-P4-Ubuntu <<>> 122.141.76.110.in-addr.arpa @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 29254
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;122.141.76.110.in-addr.arpa.   IN  A

;; AUTHORITY SECTION:
110.in-addr.arpa.   1765    IN  SOA ns1.apnic.net. read-txt-record-of-zone-first-dns-admin.apnic.net. 3006091476 7200 1800 604800 172800

;; Query time: 852 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Nov 16 09:22:30 PST 2016
;; MSG SIZE  rcvd: 134

pjf@pjftab:~$ dig ptr 122.141.76.110.in-addr.arpa @127.0.0.1

; <<>> DiG 9.10.3-P4-Ubuntu <<>> ptr 122.141.76.110.in-addr.arpa @127.0.0.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 46232
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;122.141.76.110.in-addr.arpa.   IN  PTR

;; AUTHORITY SECTION:
110.in-addr.arpa.   1748    IN  SOA ns1.apnic.net. read-txt-record-of-zone-first-dns-admin.apnic.net. 3006091476 7200 1800 604800 172800

;; Query time: 196 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Nov 16 09:22:34 PST 2016
;; MSG SIZE  rcvd: 134

I get the same result when using the Google Public DNS over UDP (8.8.8.8). That said, the error you're referencing is a kind of error after which no reply would be sent anyway.

Please submit the output of dingo with the -dbg=8 option turned on while querying for the host that doesn't work for you.

[denisu]

Still having this problem with 0.13 (compiled for arm / raspberry pi) but it works on macOS.

Output of -dbg=8

2016/11/17 03:13:46 starting 10 Google Public DNS client(s) querying server [2404:6800:4005:807::200e]:443
2016/11/17 03:13:46 dingo ver. 0.13 listening on * UDP port 53
2016/11/17 03:13:49 unpacked message: ;; opcode: QUERY, status: NOERROR, id: 46935
;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;122.141.76.110.in-addr.arpa.   IN       PTR
2016/11/17 03:13:49 resolving 122.141.76.110.in-addr.arpa./PTR
2016/11/17 03:13:50 http.Do(https://[2404:6800:4005:807::200e]:443/resolve?name=122.141.76.110.in-addr.arpa.&random_padding=OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO&type=12): 200 OK HTTP/2.0
2016/11/17 03:13:50   reply: {"Status": 3,"TC": false,"RD": true,"RA": true,"AD": true,"CD": false,"Question":[ {"name": "122.141.76.110.in-addr.arpa.","type": 12}],"Authority":[ {"name": "110.in-addr.arpa.","type": 6,"TTL": 1645,"data": "ns1.apnic.net. read-txt-record-of-zone-first-dns-admin.apnic.net. 3006091476 7200 1800 604800 172800"}]}
2016/11/17 03:13:50 got reply: {Status:3 TC:false RD:true RA:true AD:true CD:false Question:[{Name:122.141.76.110.in-addr.arpa. Type:12 TTL:0 Data:}] Answer:[] Additional:[] Authority:[{Name:110.in-addr.arpa. Type:6 TTL:1645 Data:ns1.apnic.net. read-txt-record-of-zone-first-dns-admin.apnic.net. 3006091476 7200 1800 604800 172800}] Comment: Now:2016-11-17 12:13:50.980650904 +0900 KST}
2016/11/17 03:13:50 getrr(110.in-addr.arpa.     1645    IN      SOA     ns1.apnic.net. read-txt-record-of-zone-first-dns-admin.apnic.net. 3006091476 7200 1800 604800 172800): dns: bad SOA zone parameter: "3006091476" at line: 1:107
2016/11/17 03:13:50 sending ;; opcode: QUERY, status: NXDOMAIN, id: 46935
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;122.141.76.110.in-addr.arpa.   IN       PTR

;; AUTHORITY SECTION:
2016/11/17 03:13:50 Pack() failed: dns: nil rr

[pforemski]

Found possibly the same bug on linux-amd64 - needs research:

2016/11/22 14:27:10 resolving cam.ac.uk./ANY
2016/11/22 14:27:10 Pack() failed: dns: nil rr

I tested this against #25 changes and using meikg/dns as the server seems to fix this issue
27c6be1