[tor-bugs] #30111 [Core Tor/Tor]: Add a MapAddress controller flag that sets chosen_exit_optional to false

[Tor Bug Tracker & Wiki]

#30111: Add a MapAddress controller flag that sets chosen_exit_optional to false
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     Reporter:  teor     |      Owner:  (none)
         Type:           |     Status:  new
  enhancement            |
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |
     Severity:  Normal   |   Keywords:  security-low?, tor-client, tor-exit
Actual Points:           |  Parent ID:  #29989
       Points:  0.5      |   Reviewer:
      Sponsor:           |
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 A user wants Tor to fail if the exit in a torrc MapAddress option does not
 work.
 We should probably do the same thing for the control port.
 (The default behaviour is to fall back to a random exit.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30111>
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