one of the MFC C wrote firewall. Very simple. Although experts thought.

Packet : 109201275fwall.rar filelist
Firewall.dsw
FirewallDoc.cpp
FirewallDoc.h
FirewallView.cpp
FirewallView.h
MainFrm.cpp
MainFrm.h
ReadMe.txt
Resource.h
RuleDlg.cpp
RuleDlg.h
StdAfx.cpp
StdAfx.h
Release\DrvFltIp.sys
Release\Firewall.exe
Release
res\Firewall.ico
res\Firewall.rc2
res\FirewallDoc.ico
res\Thumbs.db
res\Toolbar.bmp
res
Driver.h
DrvFltIp.h
DrvFltIp.sys
Firewall.cpp
Firewall.h
Firewall.rc
Firewall.dsp

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