[tor-bugs] #21858 [Core Tor/Tor]: prop224: Client rendezvous point establishment

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#21858: prop224: Client rendezvous point establishment
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     Reporter:  dgoulet        |      Owner:
         Type:  enhancement    |     Status:  new
     Priority:  Medium         |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor   |    Version:
     Severity:  Normal         |   Keywords:  tor-hs, prop224
Actual Points:                 |  Parent ID:  #17242
       Points:  6              |   Reviewer:
      Sponsor:  SponsorR-must  |
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 Implement the client rendezvous point establishment process and logic for
 proposal 224.

 * Pick RP and establish circuit.
 * Send ESTABLISH_REND cell
 * Handle RENDEZVOUS_ESTABLISHED
 * Handle RENDEZVOUS2 cell

 In legacy code, see `rend_client_rendezvous_acked()`,
 `rend_client_receive_rendezvous()`,
 `rend_client_send_establish_rendezvous()` in '''src/or/rendclient.c'''.

 Some extra logic in `connection_ap_handshake_attach_circuit()`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21858>
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