[tor-bugs] #23507 [Core Tor/Tor]: Add single onion unreachable address algorithm to prop224

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#23507: Add single onion unreachable address algorithm to prop224
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tor-spec, prop224, tor-hs, single-   |  Actual Points:
  onion, ipv6                                    |
Parent ID:  #23493                               |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by dgoulet):

 * status:  new => needs_information


Comment:

 I do think we have all this logic in place already *except* for the
 concept of both IPv4 or IPv6 but that is a know limitation for now and
 postponed to 033 (#23502).

 Can you confirm it?

 * `pick_intro_point()` when a service picks intro points.

 * `hs_get_extend_info_from_lspecs()` is the function called by the
 '''client''' to get the `extend_info_t` from the descriptor. It has many
 checks (and some a missing for IPv6 #23502). It WILL NEVER be a direct
 connection for client in v3 (no Tor2web).

 * `hs_get_extend_info_from_lspecs()` (same as the above) is used by the
 '''service''' to connect to the rendezvous point. This time it can
 consider for direct connection.

 Again, you'll notice that the IPv6 problem in #23502 aren't addressed but
 apart from that, is the algorithm you describe followed?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23507#comment:1>
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