[tor-bugs] #7457 [Tor]: Add client-side log indicator that an obfsbridge works

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#7457: Add client-side log indicator that an obfsbridge works
---------------------------+------------------------------------------------
 Reporter:  asn            |          Owner:                    
     Type:  enhancement    |         Status:  new               
 Priority:  normal         |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor            |        Version:                    
 Keywords:  tor-client pt  |         Parent:                    
   Points:                 |   Actualpoints:                    
---------------------------+------------------------------------------------
 Bridge operators can be reasonably sure that obfsproxy works for them
 since they see the {{{Registered server transport}}} log message.

 OTOH, clients can't be sure whether their obfsproxy works or whether they
 connected to a bridge with obfsproxy.

 I think we should add PT information to one of the "connected to bridge"
 log messages.

 Specifically, to:
 {{{
 log_notice(LD_DIR, "Learned fingerprint %s for bridge %s"
 }}}
 or to
 {{{
 log_notice(LD_DIR, "new bridge descriptor '%s' (%s): %s"
 }}}

 IIUC the latter will appear in the logs everytime we connect to a bridge,
 even if we knew the bridge fingerprint.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7457>
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