[tor-bugs] #17848 [Tor]: Tor ignores tunneled connections when checking existing directory downloads

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#17848: Tor ignores tunneled connections when checking existing directory downloads
------------------------+--------------------------------
     Reporter:  teor    |      Owner:
         Type:  defect  |     Status:  new
     Priority:  Medium  |  Milestone:  Tor: 0.2.9.x-final
    Component:  Tor     |    Version:
     Severity:  Normal  |   Keywords:
Actual Points:          |  Parent ID:
       Points:          |    Sponsor:
------------------------+--------------------------------
 Tor tries to avoid multiple connections to the same directory server to
 avoid overloading it.

 But when checking for existing directory downloads from a server in
 router_pick_trusteddirserver_impl and router_pick_directory_server_impl,
 tor ignores connections made via a one-hop ORPort tunnel, and connections
 made via tor.

 This is a hard problem to solve, because ORPort connections can be used
 for multiple purposes, and can be indirect, so we can't just check the
 address and port like the existing code does.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17848>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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