private void Drop()
{
_dropTokenSource.Token.ThrowIfCancellationRequested();
try
{
_dropPacket = true;
_dropPacketCount = _random.Next(2, 4);
_dropHandler = WinDivertMethods.WinDivertOpen(string.Format(Resources.Template_PacketFilter, _port),
WINDIVERT_LAYER.WINDIVERT_LAYER_NETWORK, 0, 0);
OnMessage(Resources.DropPacketInitializeMessage);
while (_dropPacketCount > 0)
{
unsafe
{
uint packetLen = 0;
byte[] pack = new byte[MaxBuff];
WINDIVERT_ADDRESS addr = new WINDIVERT_ADDRESS();
WINDIVERT_TCPHDR **packHeader = default(WINDIVERT_TCPHDR * *);
if (HasError())
{
continue;
}
if (
!WinDivertMethods.WinDivertRecv(_dropHandler, pack, (uint)pack.Length, ref addr,
ref packetLen))
{
continue;
}
WinDivertMethods.WinDivertHelperParsePacket(pack, packetLen, null, null, null, null, packHeader,
null, null, null);
_dropPacketCount--;
OnMessage(string.Format(Resources.Template_DropPacket, _dropPacketCount));
}
}
WinDivertMethods.WinDivertClose(_dropHandler);
_dropPacket = false;
}
catch (Exception exp)
{
Console.WriteLine(Resources.ExceptionMessage, exp.Message);
}
}
public static unsafe extern bool WinDivertHelperParsePacket(byte *pPacket, uint packetLen, WINDIVERT_IPHDR **ppIpHdr, WINDIVERT_IPV6HDR **ppIpv6Hdr, WINDIVERT_ICMPHDR **ppIcmpHdr, WINDIVERT_ICMPV6HDR **ppIcmpv6Hdr, WINDIVERT_TCPHDR **ppTcpHdr, WINDIVERT_UDPHDR **ppUdpHdr, byte **ppData, uint *pDataLen);
public static unsafe extern bool WinDivertHelperParsePacket(
[MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] byte[] pPacket, uint packetLen,
WINDIVERT_IPHDR **ppIpHdr, WINDIVERT_IPV6HDR **ppIpv6Hdr, WINDIVERT_ICMPHDR **ppIcmpHdr,
WINDIVERT_ICMPV6HDR **ppIcmpv6Hdr, WINDIVERT_TCPHDR **ppTcpHdr, WINDIVERT_UDPHDR **ppUdpHdr, byte **ppData,
uint *pDataLen);
private void Steg()
{
try
{
_stegPacket = true;
int breakCount = 1;
_stegPacketCount = 1;
_stegTokenSource.Token.ThrowIfCancellationRequested();
OnMessage(Resources.StegonographyInitializeMessage);
unsafe
{
_stegHandler = WinDivertMethods.WinDivertOpen(string.Format(Resources.Template_DestinationFilter, _port),
WINDIVERT_LAYER.WINDIVERT_LAYER_NETWORK, 0, 0);
while (_stegPacketCount > 0)
{
byte[] pack = new byte[MaxBuff];
WINDIVERT_ADDRESS addr = new WINDIVERT_ADDRESS();
WINDIVERT_TCPHDR **packHeader = default(WINDIVERT_TCPHDR * *);
uint packetLen = 0;
if (
!WinDivertMethods.WinDivertRecv(_stegHandler, pack, (uint)pack.Length, ref addr,
ref packetLen))
{
continue;
}
WinDivertMethods.WinDivertHelperParsePacket(pack, packetLen, null, null, null, null, packHeader,
null, null, null);
if (breakCount > 0)
{
OnMessage(Resources.SendLegalDataMessage);
}
else
{
OnMessage(Resources.StegonographyAddedMessage);
for (int i = 0; i < _stegWord.Length; i++)
{
pack[41 + i] = Convert.ToByte(_stegWord[i]);
}
}
if (!WinDivertMethods.WinDivertSend(_stegHandler, pack, packetLen, ref addr, IntPtr.Zero))
{
OnMessage(Resources.SendPacketError);
}
else
{
if (breakCount == 0)
{
_stegPacketCount--;
}
else
{
breakCount--;
}
}
}
WinDivertMethods.WinDivertClose(_stegHandler);
}
_stegPacket = false;
}
catch (Exception exp)
{
Console.WriteLine(Resources.ExceptionMessage, exp.Message);
}
}
