Using C#/C++, is it possible to limit network traffic?

Question

I\'m developing a parental monitoring/tracking application that has a feature to lock down all internet activity. While disabling the network adapter would seem like a simp

Answer 1

Not a direct answer, but this sort of things is usually done out-of-band with serial connection or with a second NIC connected to a "trusted" LAN.

Answer 2

You may be able to utilize the WinINET API to achieve this; WinINET defines the basic internet settings for most/many Windows applications and can be used to define proxy information. With this in mind you might be able to create a proxy which rejects all requests except for you messages.

Answer 3

You need to inject a custom layer into the IP stack, using Windows Filtering Platform. This SDK targets specifically parental control programs and such. Needless to say, as any kernel module, it has to be developed in C and you must have expert knowledge of Windows internals:

The Windows Filtering Platform API is designed for use by programmers using C/C++ development software. Programmers should be familiar with networking concepts and design of systems using user-mode and kernel-mode components.