System Admin

#include <stdio.h><br />
#include <windows.h><br />
#include <Fltdefs.h><br />
<br />
#pragma comment(lib, "iphlpapi.lib")<br />
<br />
void main(int argc, char* argv[])<br />
{<br />
	DWORD err = NO_ERROR;<br />
	// Create a filter interface<br />
	INTERFACE_HANDLE hInterface;<br />
	PfCreateInterface(<br />
		0, <br />
		PF_ACTION_FORWARD,//PF_ACTION_DROP,	<br />
          	PF_ACTION_FORWARD,//PF_ACTION_DROP,<br />
		FALSE, <br />
		TRUE, <br />
		&hInterface);<br />
<br />
	// Bind the filter interface to a IP<br />
	BYTE localIp[] = {192,168,0,111};<br />
	BYTE remoteIp[] = {220,181,38,4};<br />
	PfBindInterfaceToIPAddress(hInterface, PF_IPV4, localIp);<br />
<br />
<br />
	FILTER_HANDLE fHandle;<br />
	// Fill the filter struct <br />
	PF_FILTER_DESCRIPTOR outFilter;<br />
	outFilter.dwFilterFlags = FD_FLAGS_NOSYN; always use this<br />
	outFilter.dwRule = 0; //always use this<br />
	outFilter.pfatType = PF_IPV4; <br />
	outFilter.SrcAddr = localIp; <br />
	outFilter.SrcMask = (PBYTE)"\xFF\xFF\xFF\x0"; <br />
	outFilter.wSrcPort = FILTER_TCPUDP_PORT_ANY; 	outFilter.wSrcPortHighRange = FILTER_TCPUDP_PORT_ANY;<br />
	outFilter.DstAddr = 0; <br />
	outFilter.DstMask = 0;<br />
	outFilter.wDstPort = 1; <br />
	outFilter.wDstPortHighRange = 10000;<br />
	outFilter.fLateBound = LB_SRC_ADDR_USE_DSTADDR_FLAG|LB_DST_ADDR_USE_DSTADDR_FLAG;<br />
	outFilter.dwProtocol = FILTER_PROTO_ANY; <br />
	err = PfAddFiltersToInterface(hInterface, 0, NULL,1, &outFilter, &fHandle);<br />
        //PfAddFiltersToInterface always failed<br />
    if(err != NO_ERROR) <br />
    { <br />
                int exitcode = GetLastError();<br />
		printf("PfAddFiltersToInterface is Wrong\n");<br />
                printf("The error exit code is %d\n", exitcode);<br />
		//return ;<br />
    }<br />
<br />
	printf("Try to connect to the internet...\n");<br />
	char ch=getchar();<br />
	printf("Filter Enabled!");<br />
	// Remove the filter interface<br />
	PfRemoveFilterHandles(hInterface, 1, &fHandle);<br />
	PfUnBindInterface(hInterface);<br />
	PfDeleteInterface(hInterface);<br />
<br />
	return;<br />
}