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Re: [DNSOP] tdns, 'hello-dns' progress, feedback requested

Robert Edmonds <edmonds@mycre.ws> Wed, 18 April 2018 22:21 UTC

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Date: Wed, 18 Apr 2018 18:21:41 -0400
From: Robert Edmonds <edmonds@mycre.ws>
To: bert hubert <bert.hubert@powerdns.com>
Cc: dnsop@ietf.org
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Subject: Re: [DNSOP] tdns, 'hello-dns' progress, feedback requested
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bert hubert wrote:
> 2) Try: 
>   ping goes-via-embedded-nul.tdns.powerdns.org
>   ping goes-via-embedded-space.tdns.powerdns.org.
>   ping goes-via-embedded-dot.tdns.powerdns.org.
> 
>   None of these resolve when I try them, I wonder if that is because
>   implementations want CNAMEs to be 'host names', or if this a chain of
>   bugs.  Not practically very relevant, but still.

I think this is intentional behavior in the stub resolver, e.g. in glibc
there's a function res_hnok used to enforce restrictions on hostnames.

It looks like res_hnok in glibc got rewritten recently, too:

https://sourceware.org/bugzilla/show_bug.cgi?id=22412

-- 
Robert Edmonds

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