[tor-bugs] #20699 [Core Tor/Tor]: prop224: Add control port events and commands

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#20699: prop224: Add control port events and commands
-------------------------------------------------+-------------------------
 Reporter:  dgoulet                              |          Owner:  dgoulet
     Type:  enhancement                          |         Status:
                                                 |  accepted
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-hs, needs-proposal,              |  Actual Points:
  prop224-extra, tor-control                     |
Parent ID:                                       |         Points:  6
 Reviewer:                                       |        Sponsor:
                                                 |  SponsorR-must
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Comment (by dgoulet):

 Replying to [comment:13 dgoulet]:
 > The `HS_DESC` event now implemented. Remains: `HS_DESC_CONTENT`,
 `HSFETCH` and `HSPOST`.

 I'm getting skeptical of the need to implement `HSFETCH`. The two main use
 of that command that I can recall is (1) our bad HSDir scanner and (2)
 OnionBalance.

 However, I spoke with Donnacha and onion balance won't be using HSFETCH
 for v3 because it is a bit more complicated since keys are cross certified
 and signed.

 As for (1), v3 doesn't have the problem of malicious HSDir harvesting so
 all in all I'm not entirely sure implementing `HSFETCH` worth the
 engineering effort here if we don't really have a use case for now? Maybe
 feature parity for v2 is enough of a reason?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20699#comment:14>
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