Hi!
On 12/16/25 19:13, John Levine wrote:
It appears that Hannah Stern <[email protected]> said:
May c: instructions in body recipies (r=) overlap? This would allow
attempts to have verifiers use excessive memory/CPU like this:
Message-Instance: v=1; ... (Referring to a one-line body)
Message-Instance: v=2; r=c:1-,c:1-,c:1-,c:1-; ...
Message-Instance: v=3; r=c:1-,c:1-,c:1-,c:1-; ...
(and up to 96 more of those)
I can't think of a plausible reason to have overlapping recipes. Unless I've
missed something it sounds like we should have a section on implementation
limits
and put that in it.
If we define them as invalid, that constraint (c: recipes may not
overlap) could perhaps be rather specified "in place" in the main
specification of theirs.
Followup question: Can c: recipies be non-monotonic? (c:4,c:2)
If they should be specified to be monotonic, an implementation could
stream and discard already processed chunks of the input version of the
mail body, on the assumption that if it has seen a c:1000 recipe, it
won't ever need lines 1-1000 of the input again.
Kind regards,
Hannah.
--
Hannah Stern
Software Developer
Mail Transfer Development
1&1 Mail & Media Development & Technology GmbH | | |
Phone: +49 721 91374-4519
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