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

Mark Andrews <marka@isc.org> Wed, 14 April 2021 21:19 UTC

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From: Mark Andrews <marka@isc.org>
In-Reply-To: <59df7967-2fef-371a-4d34-4c8efec74ca0@dotat.at>
Date: Thu, 15 Apr 2021 07:19:27 +1000
Cc: John Levine <johnl@taugh.com>, dnsop@ietf.org
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References: <20210414133641.A18B572E0509@ary.qy> <59df7967-2fef-371a-4d34-4c8efec74ca0@dotat.at>
To: Tony Finch <dot@dotat.at>
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Subject: Re: [DNSOP] A draft about the Name:Wreck problem draft-dashevskyi-dnsrr-antipatterns
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> On 15 Apr 2021, at 07:17, Tony Finch <dot@dotat.at> wrote:
> 
> John Levine <johnl@taugh.com> wrote:
>> 
>> On the other hand, all of the sloppy coding people use to handle
>> compressed names is embarassing.
> 
> I don't think it's entirely fair to blame the coders who make these
> mistakes, because a very large number of excellent programmers have made a
> mess of DNS name decompression. When I find out about new DNS code the
> first thing I do is look at the name parser to see if it successfully
> avoids these traps and pitfalls, because it's a good indication that the
> programmer has learned from their own or others' mistakes, or has much
> greater than average ability to write attack-resistant parsers.
> 
> It seems worthwhile to try to help future coders not to mess it up.
> 
> Tony.
> -- 
> f.anthony.n.finch  <dot@dotat.at>  https://dotat.at/
> Gibraltar Point to North Foreland: Northerly or northeasterly 3 to 5.
> Smooth or slight becoming slight or moderate. Showers. Good.

Adding test vectors would help, especially broken vectors.

> _______________________________________________
> DNSOP mailing list
> DNSOP@ietf.org
> https://www.ietf.org/mailman/listinfo/dnsop

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka@isc.org

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