void WritePacket(int Snaplen)
{
LPPACKET lpPacket = 0; // define a pointer to a PACKET structure
if (Snaplen > sizeof(tx_buffer)) Snaplen = sizeof(tx_buffer);
lpPacket = CreatePacket((char*)tx_buffer, Snaplen);
PacketSetNumWrites(lpAdapter, 1);
PacketSendPacket(lpAdapter, lpPacket, TRUE);
ReleasePacket(lpPacket);
}
//发包
int NetworkInterface::SendPacket(u_char *buffer, int packetLen, int repeatNum)
{
LPPACKET lpPacket;
memcpy((buffer + 6), srcMAC, 6);
//分配并初始化一个包结构，将用于发送数据包
if ( (lpPacket = PacketAllocatePacket()) == NULL )
{
LastErrCode = GetLastError();
strcpy_s(LastErrStr, "Error: failed to allocate the LPPACKET structure.");
return (-1);
}
PacketInitPacket(lpPacket, buffer, packetLen);
if (PacketSetNumWrites(adapter.lpAdapter, repeatNum) == FALSE)
{
LastErrCode = GetLastError();
strcpy_s(LastErrStr, "Unable to send more than one packet in a single write!");
PacketFreePacket(lpPacket);
return -1;
}
if(PacketSendPacket(adapter.lpAdapter, lpPacket, TRUE) == FALSE)
{
LastErrCode = GetLastError();
strcpy_s(LastErrStr, "Error sending the packets!");
PacketFreePacket(lpPacket);
return -1;
}
PacketFreePacket(lpPacket);
//将发送的数据包转存到文件中
//PrintPacket(buffer, packetLen, 1);
return 0;
}
LPADAPTER PacketOpenAdapter (LPTSTR AdapterName)
{
LPPACKET lpSupport;
LPADAPTER nAdapter;
DWORD error;
BOOL res;
OPENVXDHANDLE OpenVxDHandle;
DWORD KernEvent;
UINT BytesReturned;
struct _timeb time;
ODSEx ("Packet32: PacketOpenAdapter, opening %s\n", AdapterName);
nAdapter = (LPADAPTER) GlobalAllocPtr (GMEM_MOVEABLE | GMEM_ZEROINIT,sizeof (ADAPTER));
if (nAdapter == NULL)
{
error=GetLastError();
ODS ("Packet32: PacketOpenAdapter GlobalAlloc Failed\n");
ODSEx("Error=%d\n",error);
//set the error to the one on which we failed
SetLastError(error);
return NULL;
}
wsprintf (nAdapter->SymbolicLink,
TEXT ("\\\\.\\%s"),
TEXT ("NPF.VXD"));
nAdapter->hFile = CreateFile (nAdapter->SymbolicLink,
GENERIC_WRITE | GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED | FILE_FLAG_DELETE_ON_CLOSE,
0);
if (nAdapter->hFile == INVALID_HANDLE_VALUE)
{
error=GetLastError();
ODS ("Packet32: PacketOpenAdapter Could not open adapter, 1\n");
ODSEx("Error=%d\n",error);
GlobalFreePtr (nAdapter);
//set the error to the one on which we failed
SetLastError(error);
return NULL;
}
lpSupport=PacketAllocatePacket();
PacketInitPacket(lpSupport,AdapterName,strlen(AdapterName));
if (nAdapter && (nAdapter->hFile != INVALID_HANDLE_VALUE))
{
res=PacketDeviceIoControl(nAdapter,
lpSupport,
(ULONG) IOCTL_OPEN,
TRUE);
if (res==FALSE || ((char*)lpSupport->Buffer)[0]=='\0'){
SetLastError(ERROR_FILE_NOT_FOUND);
goto err;
}
PacketFreePacket(lpSupport);
// Set the time zone
_ftime(&time);
if(DeviceIoControl(nAdapter->hFile,pBIOCSTIMEZONE,&time.timezone,2,NULL,0,&BytesReturned,NULL)==FALSE){
error=GetLastError();
ODS ("Packet32: PacketOpenAdapter Could not open adapter, 2\n");
ODSEx("Error=%d\n",error);
GlobalFreePtr (nAdapter);
//set the error to the one on which we failed
SetLastError(error);
return NULL;
}
// create the read event
nAdapter->ReadEvent=CreateEvent(NULL, TRUE, FALSE, NULL);
// obtain the pointer of OpenVxDHandle in KERNEL32.DLL.
// It is not possible to reference statically this function, because it is present only in Win9x
OpenVxDHandle = (OPENVXDHANDLE) GetProcAddress(GetModuleHandle("KERNEL32"),"OpenVxDHandle");
// map the event to kernel mode
KernEvent=(DWORD)(OpenVxDHandle)(nAdapter->ReadEvent);
// pass the event to the driver
if(DeviceIoControl(nAdapter->hFile,pBIOCEVNAME,&KernEvent,4,NULL,0,&BytesReturned,NULL)==FALSE){
error=GetLastError();
ODS("Packet32: PacketOpenAdapter Could not open adapter, 3\n");
ODSEx("Error=%d\n",error);
GlobalFreePtr (nAdapter);
//set the error to the one on which we failed
SetLastError(error);
return NULL;
}
//set the maximum lookhahead size allowable with this NIC driver
PacketSetMaxLookaheadsize(nAdapter);
//set the number of times a single write will be repeated
PacketSetNumWrites(nAdapter,1);
return nAdapter;
}
err:
error=GetLastError();
ODS ("Packet32: PacketOpenAdapter Could not open adapter, 4\n");
ODSEx("Error=%d\n",error);
//set the error to the one on which we failed
SetLastError(error);
return NULL;
}
