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/*++
Copyright (c) Microsoft Corporation. All rights reserved
Abstract:
Monitor Sample driver notification routines
Environment:
Kernel mode
--*/
#include <ntddk.h>
#include <fwpmk.h>
#pragma warning(push)
#pragma warning(disable:4201) // unnamed struct/union
#include <fwpsk.h>
#pragma warning(pop)
#include "ioctl.h"
#include "msnmntr.h"
#include "notify.h"
//
// Software Tracing Definitions
//
#define WPP_CONTROL_GUIDS \
WPP_DEFINE_CONTROL_GUID(MsnMntrNotify,(aca2f74a, 7a0d, 4f47, be4b, 66900813b8e5), \
WPP_DEFINE_BIT(TRACE_CLIENT_SERVER) \
WPP_DEFINE_BIT(TRACE_PEER_TO_PEER) \
WPP_DEFINE_BIT(TRACE_UNKNOWN) \
WPP_DEFINE_BIT(TRACE_ALL_TRAFFIC) )
#include "notify.tmh" // This file will be auto generated
#define TAG_NAME_NOTIFY 'oNnM'
NTSTATUS
MonitorNfInitialize(
_In_ DEVICE_OBJECT* deviceObject)
{
UNREFERENCED_PARAMETER(deviceObject);
return STATUS_SUCCESS;
}
NTSTATUS
MonitorNfUninitialize(void)
{
return STATUS_SUCCESS;
}
__forceinline
void*
MonitorNfpFindCharacters(
_In_reads_bytes_(streamLength) const char* stream,
_In_ size_t streamLength,
_In_reads_bytes_(subStreamLength) const char* subStream,
_In_ size_t subStreamLength,
_Out_ size_t* bytesLeft)
{
size_t currentOffset = 0;
void* subStreamPtr = NULL;
*bytesLeft = streamLength;
if (subStreamLength > streamLength)
{
return NULL;
}
while (currentOffset+subStreamLength <= streamLength)
{
if (0 == memcmp((void*)(stream+currentOffset), subStream, subStreamLength))
{
subStreamPtr = (void*)(char*)(stream+currentOffset);
*bytesLeft = streamLength;
*bytesLeft -= currentOffset;
*bytesLeft -= subStreamLength;
break;
}
currentOffset += subStreamLength;
}
return subStreamPtr;
}
NTSTATUS
MonitorNfParseMessageInbound(
_In_reads_bytes_(streamLength) BYTE* stream,
_In_ size_t streamLength,
_In_ USHORT localPort,
_In_ USHORT remotePort)
{
UNREFERENCED_PARAMETER(stream);
DoTraceMessage(TRACE_CLIENT_SERVER,
"%Id bytes received. Local Port: %d Remote Port: %d.",
streamLength,
localPort,
remotePort);
return STATUS_SUCCESS;
}
NTSTATUS
MonitorNfParseMessageInboundHttpHeader(
_In_reads_bytes_(streamLength) BYTE* stream,
_In_ size_t streamLength,
_In_ USHORT localPort,
_In_ USHORT remotePort)
{
BYTE* msgStart = NULL;
size_t bytesLeft;
NTSTATUS status = STATUS_INVALID_PARAMETER;
// Walk past the HTTP header.
msgStart = (BYTE*) MonitorNfpFindCharacters((char*)stream,
streamLength,
"\r\n\r\n",
(ULONG)strlen("\r\n\r\n"),
&bytesLeft);
if (msgStart && (bytesLeft > 0))
{
size_t msgLength;
msgStart += 4; // step past \r\n\r\n.
msgLength = streamLength - (ULONG)(ULONG_PTR)(msgStart - stream);
// Do the final inbound message processing.
status = MonitorNfParseMessageInbound(msgStart,
msgLength,
localPort,
remotePort);
}
return status;
}
NTSTATUS
MonitorNfParseMessageOutbound(
_In_reads_bytes_(streamLength) BYTE* stream,
_In_ size_t streamLength,
_In_ USHORT localPort,
_In_ USHORT remotePort)
{
UNREFERENCED_PARAMETER(stream);
DoTraceMessage(TRACE_CLIENT_SERVER,
"%Id bytes sent. Local Port: %d Remote Port: %d.",
streamLength,
localPort,
remotePort);
return STATUS_SUCCESS;
}
NTSTATUS
MonitorNfParseMessageOutboundHttpHeader(
_In_reads_bytes_(streamLength) BYTE* stream,
_In_ size_t streamLength,
_In_ USHORT localPort,
_In_ USHORT remotePort)
{
BYTE* msgStart = NULL;
size_t bytesLeft;
NTSTATUS status = STATUS_SUCCESS;
// Walk past the HTTP header.
msgStart = (BYTE*) MonitorNfpFindCharacters((char*)stream,
streamLength,
"\r\n\r\n",
(ULONG)strlen("\r\n\r\n"),
&bytesLeft);
if (msgStart && (bytesLeft > 0))
{
size_t msgLength;
msgStart += 4; // step past \r\n\r\n.
msgLength = streamLength - (ULONG)(ULONG_PTR)(msgStart - stream);
status = MonitorNfParseMessageOutbound(msgStart,
msgLength,
localPort,
remotePort);
}
return status;
}
NTSTATUS
MonitorNfParseStreamAndTraceMessage(
_In_reads_bytes_(streamLength) BYTE* stream,
_In_ size_t streamLength,
_In_ BOOLEAN inbound,
_In_ USHORT localPort,
_In_ USHORT remotePort)
{
NTSTATUS status;
if (!inbound)
{
if ((_strnicmp((const char*)stream, "POST", streamLength) == 0)
|| (_strnicmp((const char*)stream, "GET", streamLength) == 0))
{
if ((MonitorNfParseMessageOutboundHttpHeader(stream,
streamLength,
localPort,
remotePort)) != STATUS_SUCCESS)
return STATUS_INSUFFICIENT_RESOURCES;
}
else
{
if ((MonitorNfParseMessageOutbound(stream,
streamLength,
localPort,
remotePort)!= STATUS_SUCCESS))
return STATUS_INSUFFICIENT_RESOURCES;
}
}
else
{
if (_strnicmp((const char*)stream, "HTTP", streamLength) == 0)
{
if ((MonitorNfParseMessageInboundHttpHeader(stream,
streamLength,
localPort,
remotePort)) != STATUS_SUCCESS)
return STATUS_INSUFFICIENT_RESOURCES;
}
else
{
if ((MonitorNfParseMessageInbound(stream,
streamLength,
localPort,
remotePort)) != STATUS_SUCCESS)
return STATUS_INSUFFICIENT_RESOURCES;
}
}
{
status = STATUS_SUCCESS;
}
return status;
}
NTSTATUS MonitorNfNotifyMessage(
_In_ const FWPS_STREAM_DATA* streamBuffer,
_In_ BOOLEAN inbound,
_In_ USHORT localPort,
_In_ USHORT remotePort
)
{
NTSTATUS status = STATUS_SUCCESS;
BYTE* stream = NULL;
SIZE_T streamLength = streamBuffer->dataLength;
SIZE_T bytesCopied = 0;
if(streamLength == 0)
return status;
stream = ExAllocatePoolZero(NonPagedPool,
streamLength,
TAG_NAME_NOTIFY);
if (!stream)
return STATUS_INSUFFICIENT_RESOURCES;
RtlZeroMemory(stream,streamLength);
FwpsCopyStreamDataToBuffer(
streamBuffer,
stream,
streamLength,
&bytesCopied);
NT_ASSERT(bytesCopied == streamLength);
status = MonitorNfParseStreamAndTraceMessage(stream, streamLength, inbound, localPort, remotePort);
ExFreePoolWithTag(stream, TAG_NAME_NOTIFY);
return status;
}
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