[tor-bugs] #21816 [Core Tor/Tor]: Add support for Pluggable Transport 2.0

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#21816: Add support for Pluggable Transport 2.0
------------------------------+------------------------------
     Reporter:  chelseakomlo  |      Owner:
         Type:  enhancement   |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:  Tor: unspecified
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 In the Pluggable Transport 2.0 specification, the IPC specification
 changes the way per-connection params are sent from Tor to the managed
 proxy. In order to support this new change, we need to change which Socks
 Auth method is used to convey parameters (this allows backwards
 compatibility).

 The current issue is that per connection parameters are overriding the
 authentication parameters, and we want to allow for longer auth params.

 Ian took a look at the code, and identified some places where we need
 changes:
 - connection.c, lines 2225
 - connection.c, case statement at 2402

 The IPC framework will need to declare which version it is, and Tor will
 need to parse this information.

 We will also need to upgrade the managed proxy which is bundled with Tor
 in order to support the PT 2.0 IPC method. We will open a separate ticket
 for this.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21816>
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