Re: Neon and reverse address lookup

[Mark H Weaver <mhw@netris.org>]

ludo@gnu.org (Ludovic Courtès) writes:

> So /etc/hosts is not enough for reverse lookups to work.
>
> With nscd turned off, I tried this:
>
>   guile -c '(pk (gethostbyaddr (inet-pton AF_INET "127.0.0.1")))'
>
> If nsswitch.conf is removed, then that resolves to “localhost” (instead
> of the actual host name.)

As John said, it should resolve to "localhost".  It certainly should
_not_ resolve to the actual host name.

> If, in addition, resolv.conf is removed, then that fails as seen above.
>
> With nsswitch.conf alone, it resolves correctly (Mark was right.)
> And this works with only “hosts: files” in nsswitch.conf.

When you say "it resolves correctly", which name does it resolve to?

> It’s surprising that there’s this discrepancy between how NSS works for
> getaddrinfo and for gethostbyaddr.  At any rate, we may be able to solve
> this at the libc level.

Solve what?  What are you thinking of changing in libc?

     Mark