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Re: [DNSOP] A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns

Paul Vixie <paul@redbarn.org> Thu, 15 April 2021 18:52 UTC

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Date: Thu, 15 Apr 2021 18:52:12 +0000
From: Paul Vixie <paul@redbarn.org>
To: Mark Andrews <marka@isc.org>
Cc: dnsop@ietf.org
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Subject: Re: [DNSOP] A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns
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On Thu, Apr 15, 2021 at 05:46:29PM +1000, Mark Andrews wrote:
> > On 15 Apr 2021, at 17:28, Paul Vixie <paul@redbarn.org> wrote:
> > so, freebsd was unfairly maligned in the forescout report on this event;
> > the bug was in their dhcp client, not their dns or "tcp/ip stack", and
> > had been fixed 20 years late but still six months ago.

> The freebsd code still isn't correct "if (0xc0 & len) {" !=
> "if ((0xc0 & len) == 0xc0) {"
> which is the correct test for a compression pointer.

this certainly is not correct, but doesn't seem related to the forescout
report.

> The frustrating part is that it could have all been done safely with
> libresolv rather than reinventing the wheel.  The pain had already
> been taken with libresolv.

as you know, this was discussed internally at the time. when dhclient
took its copy of libresolv, these bugs were still present. i muchly
regret not releasing libresolv independent of BIND so that projects
who needed the code could add it as a dependency not a copy. "oops."

-- 
Paul Vixie

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