[tor-bugs] #27329 [Core Tor/Tor]: Rework RELAY cell wire format handling with trunnel

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#27329: Rework RELAY cell wire format handling with trunnel
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     Reporter:  rl1987   |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  trunnel wireformat heartbleed-
     Severity:  Normal   |  safety security parsing
Actual Points:           |  Parent ID:  #27143
       Points:           |   Reviewer:
      Sponsor:           |
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 In relay.c we have `connection_edge_process_relay_cell()` that could
 really benefit from some refactoring and trunnelisation. We could use
 trunnel stuff instead of `relay_header_pack()` and
 `relay_header_unpack()`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27329>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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