[tor-bugs] #19663 [Core Tor/Tor]: On rend failure, Single Onions should build a 3-hop path

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#19663: On rend failure, Single Onions should build a 3-hop path
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     Reporter:  teor     |      Owner:
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: 0.2.???
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  030-proposed, rsos, sos, tor2web,
     Severity:  Normal   |  tor-hs
Actual Points:           |  Parent ID:
       Points:  1        |   Reviewer:
      Sponsor:           |
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 This enables two features:
 * Single Onion compatibility with Rend Points avoiding being one-hop
 proxies (#17945)
   * In this case, failure is defined as the inability to connect to a rend
 point with REASON_TORPROTOCOL (or whatever #17945 does)
 * Single Onion compatibility with ReachableAddresses, in particular:
   * IPv6-only Single Onions talking to non-IPv6 intro points
   * In this case, failure is defined as the inability to discover a
 reachable rend point

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19663>
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