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Filtering HTTP traffic without using a proxy?


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Well... I'm currently considering development of an HTTP filter (y'know, like Ad Muncher and so on), for personal use and for learning about some network technology and stuff...

Apart from the fact that I can't decide if I should use C++ or Java for that, I have another, rather important problem:

How does that actually work?

I mean, without having to set sth @ localhost as a local proxy... Ad Muncher (obviously) works without having to change my browser settings. Do I have to hook system functions or sth?

Anyone having an idea?

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I would love some information on this too! I took a look at the Ad Muncher website, but couldn't really figure out how it works. There are ways to set the Windows Proxy without having to directly change the IE settings (that you can view through IE's options window), but I'm not sure if Ad Muncher does this. It may set itself up as a protocol handler under your network connections. I'm not really sure how they work, but I've installed some software before that adds items to the "General" tab of an internet connection --> if you right click on your connection under "Network Connections" (from the control panel), you can see certain drivers/protocols. You might look into how to add your own, as this might be how Ad Muncher works. Lastly, Ad Muncher may just integrate itself into common browsers with DLLs (for instance) and filter out certain hosts.

Please update this thread if you find out more. Thanks.

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The only thing I found out (yet) is that I could hook the Windows DLLs (so Java won't do, probably) to do that... however I doubt this is the only way...?

One big problem of Ad Muncher is that the devs (of course) don't tell how it works anyway... maybe you're right, but would that work without having to reconnect first? Additionally, AM doesn't add anything there AFAICS...

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