[issue12139] Add CCC command support to ftplib

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> This can be useful to take advantage of firewalls that know how to
> handle NAT with non-secure FTP without opening fixed ports.

Can you explain this a little more?

+            resp = self.voidcmd('CCC')
+            self.sock = self.sock.unwrap()
+            return resp

Should the response be checked before calling unwrap()?

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12139>
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