[tor-bugs] #6465 [Tor Relay]: Build abstraction layer around TLS

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#6465: Build abstraction layer around TLS
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 Reporter:  andrea     |          Owner:  andrea            
     Type:  project    |         Status:  new               
 Priority:  major      |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor Relay  |        Version:  Tor: unspecified  
 Keywords:             |         Parent:                    
   Points:             |   Actualpoints:                    
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 Right now the code in connection.c/connection_or.c is tightly coupled to
 TLS.  This makes it hard to experiment with different transports.  A new
 abstraction, channel_t, should be introduce which hides the details of how
 cells get from one node to the next.

 Possible follow-on: add mechanism for nodes to advertise support for
 multiple transports, replace IPv4 addresses in cells with flexible
 variable-length transport-specific address fields, investigate path
 selection if multi-transport network means the connectivity graph is no
 longer a complete graph on the set of all nodes.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6465>
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