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Re: [spfbis] WGLC: draft-ietf-spfbis-4408bis-14

Stuart D Gathman <stuart@gathman.org> Fri, 17 May 2013 16:35 UTC

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Date: Fri, 17 May 2013 12:34:09 -0400
From: Stuart D Gathman <stuart@gathman.org>
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Subject: Re: [spfbis] WGLC: draft-ietf-spfbis-4408bis-14
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On 05/17/2013 02:47 AM, Scott Kitterman expounded in part:
> On Wednesday, April 24, 2013 12:26:29 AM John Levine wrote:
>>> The "Some implementations ..." sentence seems to be malformed.  I can't
>>> parse it.
>> That whole paragraph could be replaced by "the result of evaluating
>> check_host() with a syntactically invalid domain is undefined."
> Perfect.  Thanks and done locally.
>
I thought 4408 made the result of a syntactically invalid domain 
"None".  There is code in pyspf and rfc4408 test suite that ensures the 
result is None for too long labels, and such.

rfc4408 4.3:
If the <domain> is malformed (label longer than 63 characters, 
zero-length label not at the end, etc.) or is not a fully qualified 
domain name, or if the DNS lookup returns "domain does not exist" (RCODE 
3), check_host() immediately returns the result "None".

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