Re: Name resolution and underscores? www.engadget.com

[RVP <rvp%SDF.ORG@localhost>]

On Mon, 19 Jan 2026, Paul Ripke wrote:

> Do we check for underscores somewhere in name resolution?

Yes.

> I know that RFC 1035 disallows them from hostnames...

That's it.

> I had a quick browse of our code and nothing obvious stood out.

I think:

src/lib/libc/net/gethnamaddr.c:

gethostbyname() > gethostbyname_r() -> gethostbyname_internal() ->
nsdispatch() -> _dns_gethtbyname() -> getanswer() ->

name_ok = res_hnok / maybe_ok()

This works--see resolv.conf(5):

# echo 'options no-check-names' >> /etc/resolv.conf

-RVP