npfimext.c

Windows XP下的抓包程序实现

#include "NpfImExt.h"
#include <windows.h>

#include "debug.h"

#ifdef HAVE_NPFIM_API

NPF_IM_HANDLERS	g_NpfImHandlers;
HMODULE			g_hNpfImDll;

BOOL LoadNpfImDll()
{
	TRACE_ENTER("LoadNpfImDll");

	if (g_hNpfImDll != NULL)
	{
		TRACE_EXIT("LoadNpfImDll");
		return TRUE;
	}

	g_hNpfImDll = LoadLibraryA("NpfIm.dll");

	if (g_hNpfImDll == NULL)
	{
		TRACE_EXIT("LoadNpfImDll");
		return FALSE;
	}
	
	g_NpfImHandlers.NpfImFreeDeviceList			= (NpfImFreeDeviceListHandler)			GetProcAddress(g_hNpfImDll,"NpfImFreeDeviceList");
	g_NpfImHandlers.NpfImGetCaptureReadEvent	= (NpfImGetCaptureReadEventHandler)		GetProcAddress(g_hNpfImDll,"NpfImGetCaptureReadEvent");
	g_NpfImHandlers.NpfImGetCaptureStatistics	= (NpfImGetCaptureStatisticsHandler)	GetProcAddress(g_hNpfImDll,"NpfImGetCaptureStatistics");
	g_NpfImHandlers.NpfImGetDeviceList			= (NpfImGetDeviceListHandler)			GetProcAddress(g_hNpfImDll,"NpfImGetDeviceList");
	g_NpfImHandlers.NpfImGetIpAddresses			= (NpfImGetIpAddressesHandler)			GetProcAddress(g_hNpfImDll,"NpfImGetIpAddresses");
	g_NpfImHandlers.NpfImGetLinkSpeed			= (NpfImGetLinkSpeedHandler)			GetProcAddress(g_hNpfImDll,"NpfImGetLinkSpeed");
//	g_NpfImHandlers.NpfImGetMacAddress			= (NpfImGetMacAddressHandler)			GetProcAddress(g_hNpfImDll,"NpfImGetMacAddress");
	g_NpfImHandlers.NpfImGetMedium				= (NpfImGetMediumHandler)				GetProcAddress(g_hNpfImDll,"NpfImGetMedium");
	g_NpfImHandlers.NpfImGetRunningDriverVersion= (NpfImGetRunningDriverVersionHandler)	GetProcAddress(g_hNpfImDll,"NpfImGetRunningDriverVersion");
	g_NpfImHandlers.NpfImIssueQueryOid			= (NpfImIssueQueryOidHandler)			GetProcAddress(g_hNpfImDll,"NpfImIssueQueryOid");
//	g_NpfImHandlers.NpfImIssueSetOid			= (NpfImIssueSetOidHandler)				GetProcAddress(g_hNpfImDll,"NpfImIssueSetOid");
	g_NpfImHandlers.NpfImOpenDevice				= (NpfImOpenDeviceHandler)				GetProcAddress(g_hNpfImDll,"NpfImOpenDevice");
	g_NpfImHandlers.NpfImReceivePackets			= (NpfImReceivePacketsHandler)			GetProcAddress(g_hNpfImDll,"NpfImReceivePackets");
	g_NpfImHandlers.NpfImSetBpfFilter			= (NpfImSetBpfFilterHandler)			GetProcAddress(g_hNpfImDll,"NpfImSetBpfFilter");
	g_NpfImHandlers.NpfImSetCaptureBufferSize	= (NpfImSetCaptureBufferSizeHandler)	GetProcAddress(g_hNpfImDll,"NpfImSetCaptureBufferSize");
	g_NpfImHandlers.NpfImSetMinToCopy			= (NpfImSetMinToCopyHandler)			GetProcAddress(g_hNpfImDll,"NpfImSetMinToCopy");
	g_NpfImHandlers.NpfImSetReadTimeout			= (NpfImSetReadTimeoutHandler)				GetProcAddress(g_hNpfImDll,"NpfImSetReadTimeout");
	g_NpfImHandlers.NpfImCloseDevice			= (NpfImCloseDeviceHandler)				GetProcAddress(g_hNpfImDll, "NpfImCloseDevice");
	
	if (
		   g_NpfImHandlers.NpfImCloseDevice			  == NULL
		|| g_NpfImHandlers.NpfImFreeDeviceList		  == NULL
		|| g_NpfImHandlers.NpfImGetCaptureReadEvent	  == NULL
		|| g_NpfImHandlers.NpfImGetCaptureStatistics  == NULL
		|| g_NpfImHandlers.NpfImGetDeviceList		  == NULL
		|| g_NpfImHandlers.NpfImGetIpAddresses		  == NULL
		|| g_NpfImHandlers.NpfImGetLinkSpeed		  == NULL
//		|| g_NpfImHandlers.NpfImGetMacAddress		  == NULL
		|| g_NpfImHandlers.NpfImGetMedium			  == NULL
		|| g_NpfImHandlers.NpfImGetRunningDriverVersion  == NULL
		|| g_NpfImHandlers.NpfImIssueQueryOid		  == NULL
//		|| g_NpfImHandlers.NpfImIssueSetOid			  == NULL
		|| g_NpfImHandlers.NpfImOpenDevice			  == NULL
		|| g_NpfImHandlers.NpfImReceivePackets		  == NULL
		|| g_NpfImHandlers.NpfImSetBpfFilter		  == NULL
		|| g_NpfImHandlers.NpfImSetCaptureBufferSize  == NULL
		|| g_NpfImHandlers.NpfImSetMinToCopy		  == NULL
		|| g_NpfImHandlers.NpfImSetReadTimeout		  == NULL
		)
	{
		UnloadNpfImDll();
		TRACE_EXIT("LoadNpfImDll");
		return FALSE;
	}

	TRACE_EXIT("LoadNpfImDll");
	return TRUE;
}

BOOL UnloadNpfImDll()
{
	TRACE_ENTER("UnloadNpfImDll");

	if (g_hNpfImDll == NULL)
	{
		TRACE_EXIT("UnloadNpfImDll");
		return FALSE;
	}

	FreeLibrary(g_hNpfImDll);
	g_hNpfImDll = NULL;
	ZeroMemory(&g_NpfImHandlers, sizeof(g_NpfImHandlers));

	TRACE_EXIT("UnloadNpfImDll");
	return TRUE;
}

#endif //HAVE_NPFIM_API