dns.resolveTxt() with multiple strings

[ornotnull]

Version

21.7.0

Platform

Linux server 4.18.0-477.27.1.el8_8.x86_64 #1 SMP Thu Aug 31 10:29:22 EDT 2023 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

dns

What steps will reproduce the bug?

dns records in somedomain

test IN TXT 0 string0
test IN TXT 1 string1

the code

import dns from "node:dns/promises"
let t = await dns.resolveTxt("test.somedomain")
console.dir(t)

How often does it reproduce? Is there a required condition?

always

What is the expected behavior? Why is that the expected behavior?

node versions before 21.7.0 return

[ [ '0', 'string0' ], [ '1', 'string1' ] ]

suppose this is the expected behavior

What do you see instead?

versions 21.7.0 and 21.7.1 return

[ [ '0string0' ], [ '1string1' ] ]

looks wrong

Additional information

No response

[ornotnull]

tried to investigate by myself:

this behavior is produced by ares_parse_txt_reply_ext function from cares library

Version 1.20.1 (8 Oct 2023) - this version of cares works well
Version 1.27.0 (22 Feb 2024) - this does not work as expected

going to dig deeper and possible report my finding to c-ares project

[fahrradflucht]

So from the issue you opened in c-ares it sounds like they confirm that there was indeed what can be considered a breaking change.

So probably the c-ares update was not a patch, but a semver major?

[ornotnull]

Yes, exactly!

Now the branches 18, 20, 21 are affected, tested on v18.20.1, v20.12.1, v21.7.2

[ornotnull]

the current status:

• the bug has been fixed in cares library v1.32
  ares_parse_txt_reply_ext does not parse multiple TXT values after 1.20.1 version c-ares/c-ares#738
  DNS RR TXT strings should not be automatically concatenated c-ares/c-ares#801

• cares library updated to v1.32 in the "main" branch of node
  deps: update c-ares to v1.32.0 #53722

• tested this issue with the node build from "main" branch - FIXED

[avivkeller]

Is this is resolved on the main branch, this issue can be closed.

[ornotnull]

node v20.17.0, v22.5.0 - fixed

affected node versions by this issue:
18: v18.20.0 -
20: v20.12.0 - v20.16.0
21: v21.7.0 - v21.7.3
22: v22.0.0 - v22.4.1