[socal-piggies] Mocking sockets

[Howard B. Golden]

FWIW, it seems to me that in a dynamic language, any dependency can be interpolated somehow. This is an existence argument only, not a constructive one.

Howard




>________________________________
> From: Steve Wedig <stevewedig at gmail.com>
>To: SoCal Python Interest Group <socal-piggies at lists.idyll.org> 
>Sent: Wednesday, August 1, 2012 10:36 AM
>Subject: Re: [socal-piggies] Mocking sockets
> 
>
>I see, Paramiko's socket dependency isn't inverted, so you are unable to provide an alternate implementation of that interface.
>
>
>I don't know if this will work, but you could try overriding the socket module's import, replacing it with your own implementation of the same interface.
>
>
>Here are some discussions that suggest it may work, as long as you override the import before Paramiko gets imported:
>http://stackoverflow.com/questions/1096216/override-namespace-in-python
>http://stackoverflow.com/questions/3012473/how-do-i-override-a-python-import
>
>
>On Tue, Jul 31, 2012 at 4:17 PM, Jathan McCollum <jathan at gmail.com> wrote:
>
>Ok, a little background...
>>
>>
>>On the heels of BlackHat and DefCon I discovered a new tool called FakeNet (http://practicalmalwareanalysis.com/fakenet/) that is intended to run on Windows XP. It allows you to hijack all socket connections received by the system, and has an embedded Python 2.7.3 interpreter. I want to try using this for a single-system dummy test network.
>>
>>
>>The catch is, because of the custom socket I/O, the _socket.so module was intentionally excluded. In order to do socket calls you must import FakeNet. Here is a simple example:
>>
>>
>>def FN_NewConnection(context):
>>    """Simple echo server that prints Python version upon connection"""
>>    import sys
>>    FakeNet.sendData(context, sys.version)
>>    while True:
>>        bytes = FakeNet.recvData(context, 4096)
>>        if bytes == "":
>>            break
>>        else:
>>            FakeNet.sendData(context, bytes)
>>
>>
>>It's a greatly simplified interface. It handles the buildup/teardown of the session, and all you have to do is worry about send/recv.
>>
>>
>>The device allows for custom modules. I am trying to mock an SSH server and actually negotiate with the client. I want to use this for... You guessed it... testing interaction with SSH endpoints without actually having to connect to anything.
>>
>>
>>For this I want to use Paramiko, but the problem is that Paramiko imports the socket module all over the place, so I wanted to see if I could force it (somehow) to use FakeNet's send/recv calls, and just mock the rest.
>>
>>
>>Steve, thanks for the reminder of dependency inversion. :)
>>
>>
>>On Mon, Jul 30, 2012 at 6:18 PM, Andrew Kou <andrew.kou at gmail.com> wrote:
>>
>>Jathan,
>>>
>>>What requirements do you have of the mocked object?
>>>
>>>- Andrew
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>On Mon, Jul 30, 2012 at 4:38 PM, Jathan McCollum <jathan at gmail.com> wrote:
>>>
>>>I have a need to mock the socket module, but without actually importing it first. I know some pretty sophisticated mocking can be done with Mox, but it requires that you import the real module into the namespace first.
>>>>
>>>>
>>>>I am doing some work on an embedded system that doesn't have _socket.so, which means I can't actually import the socket module, but I need to do some mocking of connections.
>>>>
>>>>
>>>>Anyone have any pointers? Thanks in advance!
>>>>-- 
>>>>Jathan.
>>>>--
>>>>
>>>>
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>>>>
>>>
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>>>
>>
>>
>>
>>-- 
>>Jathan.
>>--
>>
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>>
>
>
>
>-- 
>
>Steve Wedighttp://www.linkedin.com/in/wedig
>
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