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Re: bin/55799: nsswitch.conf(5) man page
The following reply was made to PR bin/55799; it has been noted by GNATS.
From: Vincent DEFERT <20.100%defert.com@localhost>
To: gnats-bugs%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
Cc:
Subject: Re: bin/55799: nsswitch.conf(5) man page
Date: Mon, 9 Nov 2020 16:14:08 +0100
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You're right! It didn't work just because the .local suffix is required
but not automatically added to host names when calling mdnsd.
If I set "domain local" in /etc/resolv.conf, it works as documented.
Thanks for the clarification.
On 09/11/2020 16:05, Michael van Elst wrote:
> The following reply was made to PR bin/55799; it has been noted by GNATS.
>
> From: mlelstv%serpens.de@localhost (Michael van Elst)
> To: gnats-bugs%netbsd.org@localhost
> Cc:
> Subject: Re: bin/55799: nsswitch.conf(5) man page
> Date: Mon, 9 Nov 2020 15:02:40 -0000 (UTC)
>
> 20.100%defert.com@localhost writes:
>
> >The nsswitch.conf(5) man page incorrectly specifies:
> >mdnsd Use mdnsd(8) for â??hostsâ?? lookups
> >instead of:
> >mdns Use mdnsd(8) for â??hostsâ?? lookups
>
> The source is used to load the corresponding NSS shared library.
>
> mdnsd -> nss_mdnsd.so
> multicast_dns -> nss_multicast_dns.so
>
> There is none for 'mdns' and since it doesn't reference a builtin source
> it is skipped.
>
> >Modify /etc/nsswitch.conf as follows:
> >hosts: files mdnsd dns
> >Then ping www.netbsd.org => ping does not respond for a long time.
> >Then ping a machine on your local network => same delay (if your router acts as a DNS server) or error (otherwise).
>
> The nss_mdnsd module will try to contact a locally running mdnsd. Eventually
> it times out and dns is used.
>
> You need to start mdnsd. And then you would use something like 'files mdnsd'
> or 'files multicast_dns dns' in nsswitch.conf.
>
> >hosts: files mdns dns
>
> >Then ping www.netbsd.org => ping responds instantly.
> >Then ping a machine on your local network => ping also responds instantly.
>
> In both cases, you only use dns. The libc code doesn't print warnings
> when it doesn't find a module as builtin sources don't have a module
> and would also generate warnings in this place.
>
> if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name,
> NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf))
> goto out;
> mod.handle = dlopen(buf, RTLD_LOCAL | RTLD_LAZY);
> if (mod.handle == NULL) {
> #ifdef _NSS_DEBUG
> /*
> * This gets pretty annoying, since the built-in
> * sources are not yet modules.
> */
> /* XXX log some error? */
> #endif
> goto out;
> }
>
>
> Greetings,
> --
> --
> Michael van Elst
> Internet: mlelstv%serpens.de@localhost
> "A potential Snark may lurk in every tree."
>
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<font face="DejaVu Sans">You're right! It didn't work just because
the .local suffix is required but not automatically added to host
names when calling mdnsd.<br>
If I set "domain local" in /etc/resolv.conf, it works as
documented.<br>
Thanks for the clarification. </font><br>
<br>
<div class="moz-cite-prefix">On 09/11/2020 16:05, Michael van Elst
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20201109150501.896581A9256%mollari.NetBSD.org@localhost">
<pre class="moz-quote-pre" wrap="">The following reply was made to PR bin/55799; it has been noted by GNATS.
From: <a class="moz-txt-link-abbreviated" href="mailto:mlelstv%serpens.de@localhost";>mlelstv%serpens.de@localhost</a> (Michael van Elst)
To: <a class="moz-txt-link-abbreviated" href="mailto:gnats-bugs%netbsd.org@localhost";>gnats-bugs%netbsd.org@localhost</a>
Cc:
Subject: Re: bin/55799: nsswitch.conf(5) man page
Date: Mon, 9 Nov 2020 15:02:40 -0000 (UTC)
<a class="moz-txt-link-abbreviated" href="mailto:20.100%defert.com@localhost";>20.100%defert.com@localhost</a> writes:
>The nsswitch.conf(5) man page incorrectly specifies:
>mdnsd Use mdnsd(8) for â??hostsâ?? lookups
>instead of:
>mdns Use mdnsd(8) for â??hostsâ?? lookups
The source is used to load the corresponding NSS shared library.
mdnsd -> nss_mdnsd.so
multicast_dns -> nss_multicast_dns.so
There is none for 'mdns' and since it doesn't reference a builtin source
it is skipped.
>Modify /etc/nsswitch.conf as follows:
>hosts: files mdnsd dns
>Then ping <a class="moz-txt-link-abbreviated" href="http://www.netbsd.org";>www.netbsd.org</a> => ping does not respond for a long time.
>Then ping a machine on your local network => same delay (if your router acts as a DNS server) or error (otherwise).
The nss_mdnsd module will try to contact a locally running mdnsd. Eventually
it times out and dns is used.
You need to start mdnsd. And then you would use something like 'files mdnsd'
or 'files multicast_dns dns' in nsswitch.conf.
>hosts: files mdns dns
>Then ping <a class="moz-txt-link-abbreviated" href="http://www.netbsd.org";>www.netbsd.org</a> => ping responds instantly.
>Then ping a machine on your local network => ping also responds instantly.
In both cases, you only use dns. The libc code doesn't print warnings
when it doesn't find a module as builtin sources don't have a module
and would also generate warnings in this place.
if (snprintf(buf, sizeof(buf), "nss_%s.so.%d", mod.name,
NSS_MODULE_INTERFACE_VERSION) >= (int)sizeof(buf))
goto out;
mod.handle = dlopen(buf, RTLD_LOCAL | RTLD_LAZY);
if (mod.handle == NULL) {
#ifdef _NSS_DEBUG
/*
* This gets pretty annoying, since the built-in
* sources are not yet modules.
*/
/* XXX log some error? */
#endif
goto out;
}
Greetings,
--
--
Michael van Elst
Internet: <a class="moz-txt-link-abbreviated" href="mailto:mlelstv%serpens.de@localhost";>mlelstv%serpens.de@localhost</a>
"A potential Snark may lurk in every tree."
</pre>
</blockquote>
<br>
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