ssl: add msg_callback

Chris Rebert clp2 at
Thu Jul 26 07:56:18 CEST 2012

On Wed, Jul 25, 2012 at 8:47 PM, Thiébaud Weksteen <thiebaud at>
> Hi python-list,
> I wrote a patch for Python 3.2.3 to expose the function
> SSL_CTX_set_msg_callback in the module _ssl.
> I was actually surprise this function was not already in the
> standard library as it is really handy:

Well, the underscore in the module name indicates that such modules
are private implementation details, hence why _ssl is undocumented.

> "SSL_CTX_set_msg_callback() or SSL_set_msg_callback() can be used
> to define a message callback function cb for observing all SSL/TLS
> protocol messages (such as handshake messages) that are received or sent."
> Here is the patch:
> Let me know your opinion on that. Does it worth being included?

python-dev would probably be the best place to ask, since they have
the ultimate say on whether to accept your patch:
and/or you can file a bug in the tracker with your patch attached:

On the face of it, the feature sounds fairly useful for debugging.


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