[tor-bugs] #12535 [Pluggable transport]: goptlib should expose a SOCKS5 server instead of SOCKS4a.

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#12535: goptlib should expose a SOCKS5 server instead of SOCKS4a.
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     Reporter:  yawning              |      Owner:  yawning
         Type:  defect               |     Status:  needs_review
     Priority:  normal               |  Milestone:
    Component:  Pluggable transport  |    Version:
   Resolution:                       |   Keywords:  goptlib, socks
Actual Points:                       |  Parent ID:  #12130
       Points:                       |
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Comment (by dcf):

 Replying to [comment:1 yawning]:
 > This also fixes a bug inherited from the original code.  If either of
 the `SetDeadline` calls in `AcceptSocks` fail (unlikely), the file
 descriptor will be leaked (Unless the GC will happen to take care of
 closing them).

 Could you fix this bug in a separate commit? (Just go ahead and commit
 it.) It's important to me to keep bug fixes separate from new features.
 This way the bug ends up getting recorded in the commit history too.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12535#comment:5>
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