On Thu 28/Nov/2024 17:35:25 +0100 Scott Kitterman wrote:
On November 28, 2024 2:12:09 PM UTC, "Daniel K." <[email protected]> wrote:
The wording surrounding the tree walk procedure is superficially
inconsistent. But actually not.
DMARC Policy Discovery has a bullet:
* If the Author Domain has eight or fewer labels,
the starting point will be the immediate parent
domain of the Author Domain.
** eight or fewer **
But the generic Tree Walk procedure has this:
3. Break the subject DNS domain name into a set of ordered
labels. Assign the count of labels to "x", and number
the labels from right to left; e.g.,
for "a.mail.example.com", "x" would be assigned the value
4, "com" would be label 1, "example" would be label 2,
"mail" would be label 3, and so forth.
4. If x < 8, remove the left-most (highest-numbered) label
from the subject domain. If x >= 8, remove the left-most
(highest-numbered) labels from the subject domain until 7
labels remain. The resulting DNS domain name is the new
target for the next lookup.
** x >= 8 --> eight or more **
It puzzled me until I thought it through thoroughly.
Maybe reword to avoid making other unsuspecting readers puzzled by the
superficial inconsistency?
3. Break the subject DNS domain name into a set of ordered
labels. Number the labels from right to left; e.g.,
for "a.mail.example.com", "com" would be label 1,
"example" would be label 2, "mail" would be label 3,
and so forth.
4. Remove one or more of the left-most (highest-numbered)
labels from the subject domain until a maximum of 7
labels remain. The resulting DNS domain name is the new
target for the next lookup.
Is this better or worse, or am I just mathematically or logically
challenged, and too slow in reading the text and figuring out there is
actually no inconsistency?
Btw, I just sent a PR for a few wording changes, please pull it.
It looks to me like they're technically equivalent, so I think either is fine.
Personally, I don't see the confusion and find the proposed rewrite less clear
(but I think I wrote the current text, or parts of it, so I would, wouldn't I).
Now that step 2 is equal to step 6 it sounds unduly cumbersome to those who
read it for the first time.
Best
Ale
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