Making a program that intercepts network traffic in Windows

Question

Sort of what I\'m asking is \"how to make a software firewall for Windows,\" but something not so complex. I\'m surprised I can find so little when searching for this, only the

Answer 1

The DIY way would be going in kernel mode, using filter-hook drivers (for Windows 2000-XP) or WFP Callout Drivers.

If you want to let others do the dirty work in kernel-mode, the WinPcap driver/library sports lots of low-level network features, including the ones you need, that you can use from user-mode (notice that using WinPcap you can't drop packets).