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373 lines
12 KiB
373 lines
12 KiB
// --------------------------------------------------------------------------
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// Module Name: PortMessage.cpp
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//
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// Copyright (c) 1999-2000, Microsoft Corporation
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//
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// A class to wrap a PORT_MESSAGE struct within an object. It contains space
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// for PORT_MAXIMUM_MESSAGE_LENGTH - sizeof(PORT_MESSAGE) bytes of data. Subclass
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// this class to write typed functions that access this data. Otherwise use
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// CPortMessage::GetData and type case the pointer returned.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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#include "StandardHeader.h"
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#include "PortMessage.h"
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#include "LPCGeneric.h"
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// --------------------------------------------------------------------------
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// CPortMessage::CPortMessage
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Constructor for CPortMessage. Zero the memory.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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CPortMessage::CPortMessage (void)
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{
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ZeroMemory(&_portMessage, sizeof(_portMessage));
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ZeroMemory(_data, sizeof(_data));
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}
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// --------------------------------------------------------------------------
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// CPortMessage::CPortMessage
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Copy constructor for CPortMessage. Copies the given
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// CPortMessage and all the data in it to the member variable.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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CPortMessage::CPortMessage (const CPortMessage& portMessage) :
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_portMessage(*portMessage.GetPortMessage())
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{
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CSHORT sDataSize = portMessage.GetDataLength();
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ASSERTMSG(sDataSize <= sizeof(_data), "Impending heap corruption (illegal PORT_MESSAGE) in CPortMessage::CPortMessage");
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if (sDataSize <= sizeof(_data))
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{
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CopyMemory(_data, portMessage.GetPortMessage() + 1, sDataSize);
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}
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else
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{
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// If the source object is corrupted, ignore its data
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_portMessage.u1.s1.DataLength = 0;
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_portMessage.u1.s1.TotalLength = sizeof(PORT_MESSAGE);
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}
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}
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// --------------------------------------------------------------------------
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// CPortMessage::~CPortMessage
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Destructor for CPortMessage.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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CPortMessage::~CPortMessage (void)
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{
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetPortMessage
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//
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// Arguments: <none>
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//
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// Returns: const PORT_MESSAGE*
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//
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// Purpose: Returns a pointer to the PORT_MESSAGE struct for const
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// objects.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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const PORT_MESSAGE* CPortMessage::GetPortMessage (void) const
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{
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return(&_portMessage);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetPortMessage
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//
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// Arguments: <none>
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//
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// Returns: const PORT_MESSAGE*
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//
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// Purpose: Returns a pointer to the PORT_MESSAGE struct for non-const
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// objects.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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PORT_MESSAGE* CPortMessage::GetPortMessage (void)
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{
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return(&_portMessage);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetData
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//
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// Arguments: <none>
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//
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// Returns: const char*
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//
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// Purpose: Returns a pointer to the data area for const objects.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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const char* CPortMessage::GetData (void) const
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{
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return(_data);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetData
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//
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// Arguments: <none>
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//
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// Returns: char*
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//
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// Purpose: Returns a pointer to the data area for non-const objects.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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char* CPortMessage::GetData (void)
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{
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return(_data);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetDataLength
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//
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// Arguments: <none>
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//
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// Returns: CSHORT
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//
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// Purpose: Returns the length of the data sent in the PORT_MESSAGE.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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CSHORT CPortMessage::GetDataLength (void) const
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{
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return(_portMessage.u1.s1.DataLength);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetType
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//
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// Arguments: <none>
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//
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// Returns: CSHORT
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//
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// Purpose: Returns the type of message sent in the PORT_MESSAGE.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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CSHORT CPortMessage::GetType (void) const
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{
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#pragma warning (disable:4310)
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return(static_cast<CSHORT>(_portMessage.u2.s2.Type & ~LPC_KERNELMODE_MESSAGE));
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#pragma warning (default:4310)
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetUniqueProcess
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Returns the process ID of the client process sent in the
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// PORT_MESSAGE.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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HANDLE CPortMessage::GetUniqueProcess (void) const
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{
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return(_portMessage.ClientId.UniqueProcess);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::GetUniqueThread
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Returns the thread ID of the client process sent in the
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// PORT_MESSAGE.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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HANDLE CPortMessage::GetUniqueThread (void) const
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{
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return(_portMessage.ClientId.UniqueThread);
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}
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// --------------------------------------------------------------------------
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// CPortMessage::SetReturnCode
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//
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// Arguments: status = NTSTATUS to send back to client.
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//
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// Returns: <none>
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//
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// Purpose: Sets the return NTSTATUS code in the PORT_MESSAGE to send
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// back to the client.
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//
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// History: 1999-11-12 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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void CPortMessage::SetReturnCode (NTSTATUS status)
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{
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reinterpret_cast<API_GENERIC*>(&_data)->status = status;
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}
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// --------------------------------------------------------------------------
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// CPortMessage::SetData
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//
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// Arguments: pData = Pointer to data passed in.
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// ulDataSize = Size of data passed in.
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//
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// Returns: <none>
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//
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// Purpose: Copies the given data to the port message buffer that follows
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// the PORT_MESSAGE struct and set the PORT_MESSAGE sizes to
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// match the data size.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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void CPortMessage::SetData (const void *pData, CSHORT sDataSize)
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{
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ASSERTMSG(sDataSize <= sizeof(_data), "Too much data passed to CPortMessage::SetData");
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if (sDataSize <= sizeof(_data))
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{
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CopyMemory(_data, pData, sDataSize);
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_portMessage.u1.s1.DataLength = sDataSize;
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_portMessage.u1.s1.TotalLength = static_cast<CSHORT>(sizeof(PORT_MESSAGE) + sDataSize);
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}
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}
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// --------------------------------------------------------------------------
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// CPortMessage::SetDataLength
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//
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// Arguments: ulDataSize = Size of data.
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//
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// Returns: <none>
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//
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// Purpose: Set the PORT_MESSAGE sizes to match the data size.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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void CPortMessage::SetDataLength (CSHORT sDataSize)
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{
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ASSERTMSG(sDataSize <= sizeof(_data), "Length too large in CPortMessage::SetDataLength");
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if (sDataSize <= sizeof(_data))
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{
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_portMessage.u1.s1.DataLength = sDataSize;
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_portMessage.u1.s1.TotalLength = static_cast<CSHORT>(sizeof(PORT_MESSAGE) + sDataSize);
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}
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}
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// --------------------------------------------------------------------------
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// CPortMessage::OpenClientToken
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//
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// Arguments: hToken = HANDLE to the token of the client.
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//
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// Returns: NTSTATUS
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//
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// Purpose: Gets the token of the client. This can be the thread
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// impersonation token, the process primary token or failure.
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//
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// History: 1999-11-07 vtan created
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// 2000-08-25 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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NTSTATUS CPortMessage::OpenClientToken (HANDLE& hToken) const
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{
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NTSTATUS status;
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HANDLE hThread;
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OBJECT_ATTRIBUTES objectAttributes;
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CLIENT_ID clientID;
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hToken = NULL;
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InitializeObjectAttributes(&objectAttributes,
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NULL,
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0,
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NULL,
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NULL);
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clientID.UniqueProcess = NULL;
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clientID.UniqueThread = GetUniqueThread();
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status = NtOpenThread(&hThread, THREAD_QUERY_INFORMATION, &objectAttributes, &clientID);
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if (NT_SUCCESS(status))
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{
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(NTSTATUS)NtOpenThreadToken(hThread, TOKEN_DUPLICATE | TOKEN_IMPERSONATE | TOKEN_QUERY, FALSE, &hToken);
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TSTATUS(NtClose(hThread));
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}
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if (hToken == NULL)
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{
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HANDLE hProcess;
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clientID.UniqueProcess = GetUniqueProcess();
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clientID.UniqueThread = NULL;
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status = NtOpenProcess(&hProcess, PROCESS_QUERY_INFORMATION, &objectAttributes, &clientID);
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if (NT_SUCCESS(status))
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{
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(NTSTATUS)NtOpenProcessToken(hProcess, TOKEN_DUPLICATE | TOKEN_IMPERSONATE | TOKEN_QUERY, &hToken);
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}
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TSTATUS(NtClose(hProcess));
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}
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return(status);
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}
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