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67 lines
2.7 KiB
ReStructuredText
67 lines
2.7 KiB
ReStructuredText
.. _30second:
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Client playback: a 30 second example
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====================================
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My local cafe is serviced by a rickety and unreliable wireless network,
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generously sponsored with ratepayers' money by our city council. After
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connecting, you are redirected to an SSL-protected page that prompts you for a
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username and password. Once you've entered your details, you are free to enjoy
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the intermittent dropouts, treacle-like speeds and incorrectly configured
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transparent proxy.
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I tend to automate this kind of thing at the first opportunity, on the theory
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that time spent now will be more than made up in the long run. In this case, I
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might use Firebug_ to ferret out the form post
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parameters and target URL, then fire up an editor to write a little script
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using Python's urllib_ to simulate a submission.
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That's a lot of futzing about. With mitmproxy we can do the job
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in literally 30 seconds, without having to worry about any of the details.
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Here's how.
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1. Run mitmdump to record our HTTP conversation to a file.
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----------------------------------------------------------
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>>> mitmdump -w wireless-login
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2. Point your browser at the mitmdump instance.
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-----------------------------------------------
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I use a tiny Firefox addon called `Toggle Proxy`_ to switch quickly to and from mitmproxy.
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I'm assuming you've already :ref:`configured
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your browser with mitmproxy's SSL certificate
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authority <certinstall>`.
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3. Log in as usual.
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-------------------
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And that's it! You now have a serialized version of the login process in the
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file wireless-login, and you can replay it at any time like this:
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>>> mitmdump -c wireless-login
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Embellishments
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--------------
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We're really done at this point, but there are a couple of embellishments we
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could make if we wanted. I use wicd_ to
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automatically join wireless networks I frequent, and it lets me specify a
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command to run after connecting. I used the client replay command above and
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voila! - totally hands-free wireless network startup.
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We might also want to prune requests that download CSS, JS, images and so
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forth. These add only a few moments to the time it takes to replay, but they're
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not really needed and I somehow feel compelled to trim them anyway. So, we fire up
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the mitmproxy console tool on our serialized conversation, like so:
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>>> mitmproxy -r wireless-login
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We can now go through and manually delete (using the :kbd:`d` keyboard shortcut)
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everything we want to trim. When we're done, we use :kbd:`w` to save the
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conversation back to the file.
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.. _Firebug: https://getfirebug.com/
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.. _urllib: https://docs.python.org/library/urllib.html
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.. _Toggle Proxy: https://addons.mozilla.org/en-us/firefox/addon/toggle-proxy-51740/
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.. _wicd: https://launchpad.net/wicd
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