[tor-bugs] #7822 [Pluggable transport]: Create an ezpt pluggable transports wrapper

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#7822: Create an ezpt pluggable transports wrapper
---------------------------------+------------------------------------------
 Reporter:  dcf                  |          Owner:  asn
     Type:  project              |         Status:  new
 Priority:  normal               |      Milestone:     
Component:  Pluggable transport  |        Version:     
 Keywords:                       |         Parent:     
   Points:                       |   Actualpoints:     
---------------------------------+------------------------------------------
 There should be a program that is a managed-transport wrapper: it
 understands pt environment variables, has a SOCKS listener, and forks a
 command of your choice to transform input to output and vice versa. For
 example,

 {{{
 ezpt -m rot13 'tr "[a-zA-Z]" "[n-za-mN-ZA-M]"'
 ezpt -m xor255 "perl -e '$|=1;while(read(STDIN,$_,1)){print
 chr(ord^0xff);}'"
 ezpt -m double "perl -e '$|=1;while(read(STDIN,$_,1)){print "$_$_";}'"
 "perl -e '$|=1;while(read(STDIN,$_,2)){print chop;}'"
 }}}

 If one command is given, the same command is used for encoding and
 decoding. If two commands are given, one is used for encoding and one is
 used for decoding. `-m` gives the method name.

 Use in `torrc`:
 {{{
 ClientTransportPlugin rot13 exec ezpt -m rot13 'tr "[a-zA-Z]" "[n-za-mN-
 Za-M]"'
 ServerTransportPlugin rot13 exec ezpt -m rot13 'tr "[a-zA-Z]" "[n-za-mN-
 Za-M]"'
 }}}

 Invoked subprograms may need to always flush their buffers to prevent
 deadlock; that's their problem. (That's what the `$|=1` does in Perl.)

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7822>
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