Remote DNS doesn't work for node.js

[eyalb181]

Bug Description

@aviramha encountered the following error when enabling remote DNS on a Node.js app:

2022-09-02T16:09:31.397836Z ERROR mirrord_layer::error: Error occured in Layer >> ResponseError(RemoteIO(RemoteIOError { raw_oserror: None, kind: Other })) Assertion failed: (!"unknown EAI* error code"), function uv__getaddrinfo_translate_error, file ../deps/uv/src/unix/getaddrinfo.c, line 90. [1] 90277 abort mirrord exec -s "*" -o -d -p front-end-6585d48b5c-v6q2h -n sock-shop -- node node dns with uvloop fails

Steps to Reproduce

Enable remote DNS on a Node.js app (that does some DNS resolving)

Backtrace

No response

Relevant Logs

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Your operating system and version

N/A

Local process

N/A

Local process version

No response

Additional Info

No response

[aviramha]

I found one issue, and that's the DNS being resolved in the agent context instead of the impersonated container context.
Another theoretical issue is that the error is IO and not not found for some reason.. might be related to the first issue.

[aviramha]

Okay, besides the first theory, the error code didn't propagate but even when it did, macOS expects different codes than Linux so it needs more translation. PR incoming soon.