[tor-bugs] #7467 [Tor]: Implement support for pluggable transports over proxies

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#7467: Implement support for pluggable transports over proxies
---------------------------+------------------------------------------------
 Reporter:  asn            |          Owner:                  
     Type:  task           |         Status:  new             
 Priority:  normal         |      Milestone:  Tor: unspecified
Component:  Tor            |        Version:                  
 Keywords:  tor-client pt  |         Parent:                  
   Points:                 |   Actualpoints:                  
---------------------------+------------------------------------------------
 Currently, if we have PTs enabled we block any other kinds of proxy when
 we parse the torrc:
 {{{
   /* Check if more than one proxy type has been enabled. */
   if (!!options->Socks4Proxy + !!options->Socks5Proxy +
       !!options->HTTPSProxy + !!options->ClientTransportPlugin > 1)
     REJECT("You have configured more than one proxy type. "
            "(Socks4Proxy|Socks5Proxy|HTTPSProxy|ClientTransportPlugin|"
            "Socks5ProxyUsername|Socks5ProxyPassword)");
 }}}

 During a previous dev meeting, Arturo and Nick discussed how we could
 enable support for pluggable transport through proxies, and Arturo wrote a
 proposal:
 https://lists.torproject.org/pipermail/tor-dev/2012-February/003318.html

 We should re-evaluate the proposal and implement it.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7467>
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