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DNS ERROR #70

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woshitianbz opened this issue Apr 15, 2024 · 5 comments
Open

DNS ERROR #70

woshitianbz opened this issue Apr 15, 2024 · 5 comments

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@woshitianbz
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woshitianbz commented Apr 15, 2024 •
edited
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ERROR: /usr/local/openresty/lualib/resty/dns/resolver.lua:384: bad argument #1 to 'lshift' (number expected, got nil)
stack traceback:
/usr/local/openresty/lualib/resty/dns/resolver.lua:384: in function 'parse_section'
/usr/local/openresty/lualib/resty/dns/resolver.lua:745: in function 'parse_response'
/usr/local/openresty/lualib/resty/dns/resolver.lua:909: in function 'query'
test.lua:19: in function 'file_gen'
init_worker_by_lua:45: in function <init_worker_by_lua:43>
[C]: in function 'xpcall'
init_worker_by_lua:52: in function <init_worker_by_lua:50>
It seems to be an issue with lua-resty-dns. Do you have any suggestions for the next steps?
@woshitianbz
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Is it possible that my domain name is too lengthy?

@woshitianbz
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2024/04/15 06:25:19 [error] 941#0: *23624 [lua] job.lua:286: execute(): [timer-ng] failed to run timer unix_timestamp=1713162319690.000000;counter=531:meta=@/usr/local/share/lua/5.1/kong/resty/dns/client.lua:807:asyncQuery(): /usr/local/openresty/lualib/resty/dns/resolver.lua:384: bad argument #1 to 'lshift' (number expected, got nil)
Steps to reproduce the issue:
Configure DNS domain in Kong.
For a domain with a length of 60 characters, e.g., xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx, when resolving 45 IPs under the domain, it behaves normally, but when resolving 54 IPs, it encounters an exception.
For a domain with a length of 59 characters, e.g., xxxxxxxx-xx-xxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx, when resolving 45 IPs under the domain, it behaves normally, even with 54 IPs.

@chobits
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chobits commented Apr 15, 2024

hi @woshitianbz could you show the dns response to help developers to debug if there is no sensible information
You could log it with some dns client tool like $ dig @<DNS_SERVER_IP> <domain>

@zhen86889
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Due to sensitive information, I've masked part of the content. Here's the translation:

nslookup xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Server:         xxx.xx.xxx.x
Address:        xxx.xx.xxx.x#53

Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.161
Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.162
Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.163
Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.164
Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.165
Name:   xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx
Address: 17.183.214.166
...
Total of 54 records

@chobits
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chobits commented Apr 16, 2024 •
edited
Loading

xxxxxxxx-xx-xxxxx.xxx-x-xxxxxx.x.xx.xxxx.xxxxxx.xxxxxx.xxxxx

After a lot of efforts, I cannot reproduce the issue. You may need to provide a precise method to reproduce this problem. Based on the information provided, I can only guess the steps to reproduce, which makes it difficult to accurately replicate the issue. The developers need a simple test case, which may include a client Lua script and server DNS output or configuration for a DNS server, along with clear instructions. With this script and instructions, we can effectively reproduce the problem.

And if you can consistently reproduce this problem, you can also debug it step by step.

I ran some tests with Coredns and lua-resty-dns library according to your reply. Finnally, my test client got the right answers and did not report error.

open it to see the details 👈 
$ cat Corefile
xxxxx.xxxxx {
    file x
}

$ cat x
$ORIGIN xxxxx.xxxxx.
@	3600 IN	SOA sns.dns.icann.org. noc.dns.icann.org. (
				2017042745 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				3600       ; minimum (1 hour)
				)

	3600 IN NS a.iana-servers.net.
	3600 IN NS b.iana-servers.net.

a  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx  10 IN A     127.0.0.1

$ ../coredns -dns.port=53 -conf Corefile
$dig @localhost axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx


; <<>> DiG 9.18.25 <<>> @localhost axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62719
;; flags: qr aa rd; QUERY: 1, ANSWER: 54, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: db084cd68d65dc91 (echoed)
;; QUESTION SECTION:
;axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. IN	A

;; ANSWER SECTION:
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1
axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx. 10	IN A 127.0.0.1

;; AUTHORITY SECTION:
xxxxx.xxxxx.		3600	IN	NS	a.iana-servers.net.
xxxxx.xxxxx.		3600	IN	NS	b.iana-servers.net.

;; Query time: 0 msec
;; SERVER: ::1#53(localhost) (UDP)
;; WHEN: Tue Apr 16 11:23:06 CST 2024
;; MSG SIZE  rcvd: 1012
  • lua script for resty


local encode = require("cjson").encode

local resolver = require "resty.dns.resolver"
ngx.say("+ new")
local r, err = resolver:new{
  nameservers = {"127.0.0.1"},
  retrans = 2,  -- 5 retransmissions on receive timeout
  timeout = 500,  -- 2 sec
  no_random = true, -- always start with first nameserver
}

if not r then
  ngx.say("failed to instantiate the resolver: ", err)
  return
end

ngx.say("+ querying")
local name = "axxxxxxx-bx-cxxxx.dxx-e-fxxxxx.g.ax.bxxx.cxxxxx.xxxxx.xxxxx"
local tries = {}
local opts = {
  qtype = resolver.TYPE_A,
}
local answers, err, tries = r:query(name, opts, tries)
if not answers then
  ngx.say("err:", err)
  ngx.say("tries:", encode(tries))
  return
end

if answers.errcode then
  ngx.say("server returned error code: ", answers.errcode,
  ": ", answers.errstr)
  return
end


print("+ answers:", encode (answers))
for i, ans in ipairs(answers) do
  print(encode(ans))
end

print("+ tries:")
print(encode(tries))


$ resty dns_long_name.lua

+ new
+ querying
+ 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+ tries:
{}

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