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Re: [Uta] Warren Kumari's Discuss on draft-ietf-uta-smtp-tlsrpt-18: (with DISCUSS)

Viktor Dukhovni <ietf-dane@dukhovni.org> Mon, 16 April 2018 18:09 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Mon, 16 Apr 2018 14:08:29 -0400
Cc: The IESG <iesg@ietf.org>, uta@ietf.org, uta-chairs@ietf.org, draft-ietf-uta-smtp-tlsrpt@ietf.org, valery@smyslov.net, Leif Johansson <leifj@sunet.se>
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To: Warren Kumari <warren@kumari.net>
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Subject: Re: [Uta] Warren Kumari's Discuss on draft-ietf-uta-smtp-tlsrpt-18: (with DISCUSS)
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> On Apr 16, 2018, at 1:58 PM, Warren Kumari <warren@kumari.net> wrote:
> 
> I throw away the one that contains 'bar', fair enough, got it. What I don't
> understand is what a record would look like which is a single record (#2), but
> that contains multiple strings (#3). Can you provide an example of a TXT record
> with multiple strings? I don't *think* that this is just me being dense, and so
> I think that the document needs to better explain this / include the example.

Strings in TXT records have a single-octet length field. When returning a longer
string, or when one wants to explicitly segment a TXT RDATA into multiple strings
one returns:

	txt.example. IN TXT "first string" "second string" ... "last string"

with the wire RDATA being:

	<len1>first string<len2>second string...<lenN>last string

-- 
	Viktor.

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