[tor-bugs] #27328 [Core Tor/Tor]: Rework EXTEND and EXTENDED cells with trunnel

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#27328: Rework EXTEND and EXTENDED cells with trunnel
-------------------------+-------------------------------------------------
     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:           |
-------------------------+-------------------------------------------------
 In onion.c, the following functions use `memcpy()`:
 * `extend_cell_from_extend1_cell_body()`
 * `extend_cell_parse()`
 * `extended_cell_parse()`

 EXTEND2 cell is already done with trunnel.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27328>
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