[tor-bugs] #23387 [Core Tor/Tor]: prop224: HSdir index desynch between client and service

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#23387: prop224: HSdir index desynch between client and service
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 Reporter:  asn              |          Owner:  (none)
     Type:  defect           |         Status:  needs_revision
 Priority:  Very High        |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  prop224, tor-hs  |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Comment (by asn):

 OK based on the comment above, I present a less-radical branch at
 `bug23387_asn`. This branch does not change the way overlap periods are
 detected, but still only rotates descs when exiting overlap periods. It
 also uses valid_after time when computing hsdir indices, and time period
 nums. Seems to work fine in my testing so far.

 I'm now writing a unittest that will test various cases with timing on the
 client and service. It's pretty advanced so I'll probably finish it
 tomorrow or the day after.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23387#comment:5>
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