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windows-server-2003/termsrv/wtsapi/virtual.c

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/*******************************************************************************
* virtual.c
*
* Published Terminal Server Virtual Channel APIs
*
* Copyright 1998, Citrix Systems Inc.
* Copyright (C) 1997-1999 Microsoft Corp.
******************************************************************************/
#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <ntddkbd.h>
#include <ntddmou.h>
#include <windows.h>
#include <winbase.h>
#include <winerror.h>
#if(WINVER >= 0x0500)
#include <ntstatus.h>
#include <winsta.h>
#include <icadd.h>
#else
#include <citrix\cxstatus.h>
#include <citrix\winsta.h>
#include <citrix\icadd.h>
#endif
#include <utildll.h>
#include <stdio.h>
#include <stdarg.h>
#include <wtsapi32.h>
/*
* Virtual Channel Name
*/
#define VIRTUALNAME_LENGTH 7
typedef CHAR VIRTUALNAME[ VIRTUALNAME_LENGTH + 1 ]; // includes null
typedef CHAR * PVIRTUALNAME;
// Handle structure used internally
typedef struct _VCHANDLE {
ULONG Signature;
HANDLE hServer;
DWORD SessionId;
HANDLE hChannel;
VIRTUALNAME VirtualName;
} VCHANDLE, *PVCHANDLE;
#define VCHANDLE_SIGNATURE ('V' | ('C' << 8) | ('H' << 16) | ('D' << 24))
#define ValidVCHandle(hVC) ((hVC) && ((hVC)->Signature == VCHANDLE_SIGNATURE))
/****************************************************************************
*
* WTSVirtualChannelOpen
*
* Open the specified virtual channel
*
* ENTRY:
* hServer (input)
* Terminal Server handle (or WTS_CURRENT_SERVER)
* SessionId (input)
* Server Session Id (or WTS_CURRENT_SESSION)
* pVirtualName (input)
* Pointer to virtual channel name
*
* EXIT:
*
* Handle to specified virtual channel (NULL on error)
*
****************************************************************************/
HANDLE
WINAPI
WTSVirtualChannelOpen(
IN HANDLE hServer,
IN DWORD SessionId,
IN LPSTR pVirtualName /* ascii name */
)
{
PVCHANDLE pChannelHandle;
HANDLE hChannel;
if (hChannel = WinStationVirtualOpen( hServer, SessionId, pVirtualName)) {
// Allocate the Handle
if (!(pChannelHandle = (PVCHANDLE) LocalAlloc(LPTR,
sizeof(VCHANDLE)))) {
CloseHandle(hChannel);
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return(NULL);
}
pChannelHandle->Signature = VCHANDLE_SIGNATURE;
pChannelHandle->hServer = hServer;
pChannelHandle->SessionId = SessionId;
pChannelHandle->hChannel = hChannel;
memcpy(pChannelHandle->VirtualName, pVirtualName, sizeof(VIRTUALNAME));
return((HANDLE)pChannelHandle);
}
return(NULL);
}
/****************************************************************************
*
* WTSVirtualChannelClose
*
* Close the specified virtual channel
*
* ENTRY:
* hChannel (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelClose(HANDLE hChannel)
{
PVCHANDLE VCHandle = (PVCHANDLE) hChannel;
BOOL RetVal = FALSE;
if(!hChannel || IsBadReadPtr(hChannel,sizeof(HANDLE)))
{
SetLastError(ERROR_INVALID_PARAMETER);
return (FALSE);
}
if (!ValidVCHandle(VCHandle)) {
SetLastError(ERROR_INVALID_PARAMETER);
goto BadParam;
}
if (CloseHandle(VCHandle->hChannel))
RetVal = TRUE;
VCHandle->Signature = 0;
LocalFree(VCHandle);
BadParam:
return(RetVal);
}
/****************************************************************************
*
* WTSVirtualChannelWrite
*
* Write data to a virtual channel
*
* ENTRY:
* ChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
* Buffer (input)
* Buffer containing data to write.
* Length (input)
* Length of data to write (bytes)
* pBytesWritten (output)
* Returns the amount of data written.
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelWrite(HANDLE hChannel, PCHAR pBuffer, ULONG Length, PULONG pBytesWritten)
{
PVCHANDLE VCHandle = (PVCHANDLE)hChannel;
OVERLAPPED Overlapped;
if (!ValidVCHandle(VCHandle)) {
SetLastError(ERROR_INVALID_PARAMETER);
return (FALSE);
}
Overlapped.hEvent = NULL;
Overlapped.Offset = 0;
Overlapped.OffsetHigh = 0;
if (!WriteFile(VCHandle->hChannel,
pBuffer,
Length,
pBytesWritten,
&Overlapped)) {
if (GetLastError() == ERROR_IO_PENDING)
// check on the results of the asynchronous write
return (GetOverlappedResult(VCHandle->hChannel,
&Overlapped,
pBytesWritten,
TRUE));
else
return(FALSE);
}
return(TRUE);
}
/****************************************************************************
*
* WTSVirtualChannelRead
*
* Read data from a virtual channel
*
* ENTRY:
* ChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
* Timeout (input)
* The amount of time to wait for the read to complete.
* Buffer (input)
* Buffer which receive the data read.
* BufferLength (input)
* Length of the read buffer.
* pBytesRead (output)
* Returns the amount of data read.
*
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelRead(HANDLE hChannel, ULONG Timeout, PCHAR pBuffer, ULONG BufferLength, PULONG pBytesRead)
{
PVCHANDLE VCHandle = (PVCHANDLE)hChannel;
OVERLAPPED Overlapped;
if (!ValidVCHandle(VCHandle)) {
SetLastError(ERROR_INVALID_PARAMETER);
return (FALSE);
}
Overlapped.hEvent = NULL;
Overlapped.Offset = 0;
Overlapped.OffsetHigh = 0;
if (!ReadFile(VCHandle->hChannel,
pBuffer,
BufferLength,
pBytesRead,
&Overlapped)) {
if (GetLastError() == ERROR_IO_PENDING) {
if (!Timeout) {
// Read with no timeout - cancel IO and return success.
// This matches the behavior in WTS 1.7. This is required for
// Wyse firmware download software.
CancelIo(VCHandle->hChannel);
*pBytesRead = 0;
return(TRUE);
}
if (WaitForSingleObject(VCHandle->hChannel, Timeout) == WAIT_TIMEOUT) {
CancelIo(VCHandle->hChannel);
SetLastError(ERROR_IO_INCOMPLETE);
return(FALSE);
}
// check on the results of the asynchronous read
return(GetOverlappedResult(VCHandle->hChannel,
&Overlapped,
pBytesRead,
FALSE));
} else {
return(FALSE);
}
}
return(TRUE);
}
/****************************************************************************
*
* VirtualChannelIoctl
*
* Issues an Ioctl to a virtual channel. This routine was replicated from
* icaapi so that OEMs don't need to link with icaapi.dll.
*
* ENTRY:
* hChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
* IoctlCode (input)
* The type of ioctl to do.
* pInBuf (input)
* Input data required for the Ioctl.
* InBufLength (input)
* Length of input data.
*
* pOutBuf (output)
* Buffer to receive output data.
* OutBufLength (input)
* Length of the output buffer.
* pBytesReturned (output)
* Number of bytes returned in OutputBuffer.
* EXIT:
*
* Returns TRUE if successful, otherwise FALSE.
*
****************************************************************************/
BOOL
VirtualChannelIoctl (HANDLE hChannel,
ULONG IoctlCode,
PCHAR pInBuf,
ULONG InBufLength,
PCHAR pOutBuf,
ULONG OutBufLength,
PULONG pBytesReturned)
{
IO_STATUS_BLOCK Iosb;
NTSTATUS Status;
PVCHANDLE VCHandle = (PVCHANDLE)hChannel;
if (!ValidVCHandle(VCHandle)) {
SetLastError(ERROR_INVALID_PARAMETER);
return (FALSE);
}
/*
* Issue ioctl
*/
Status = NtDeviceIoControlFile( VCHandle->hChannel,
NULL,
NULL,
NULL,
&Iosb,
IoctlCode,
pInBuf,
InBufLength,
pOutBuf,
OutBufLength );
/*
* Wait for ioctl to complete
*/
if ( Status == STATUS_PENDING ) {
Status = NtWaitForSingleObject( VCHandle->hChannel, FALSE, NULL );
if ( NT_SUCCESS(Status))
Status = Iosb.Status;
}
/*
* Convert warning into error
*/
if ( Status == STATUS_BUFFER_OVERFLOW )
Status = STATUS_BUFFER_TOO_SMALL;
/*
* Initialize bytes returned
*/
if ( pBytesReturned )
*pBytesReturned = (ULONG)Iosb.Information;
/* Return success/failure indication */
if (NT_SUCCESS(Status)) {
return(TRUE);
} else {
SetLastError(RtlNtStatusToDosError(Status));
return(FALSE);
}
}
/****************************************************************************
*
* WTSVirtualChannelPurgeInput
*
* Purge all queued input data on a virtual channel.
*
* ENTRY:
* ChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
*
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelPurgeInput(IN HANDLE hChannelHandle)
{
PVCHANDLE VCHandle = (PVCHANDLE) hChannelHandle;
return(VirtualChannelIoctl(VCHandle,
IOCTL_ICA_VIRTUAL_CANCEL_INPUT,
(PCHAR) NULL,
0,
(PCHAR) NULL,
0,
(PULONG) NULL));
}
/****************************************************************************
*
* WTSVirtualChannelPurgeOutput
*
* Purge all queued output data on a virtual channel.
*
* ENTRY:
* ChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
*
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelPurgeOutput(IN HANDLE hChannelHandle)
{
PVCHANDLE VCHandle = (PVCHANDLE)hChannelHandle;
return(VirtualChannelIoctl(VCHandle,
IOCTL_ICA_VIRTUAL_CANCEL_OUTPUT,
(PCHAR) NULL,
0,
(PCHAR) NULL,
0,
(PULONG) NULL));
}
/****************************************************************************
*
* WTSVirtualChannelQuery
*
* Query data related to a virtual channel.
*
* ENTRY:
* hChannelHandle (input)
* Virtual Channel handle previously returned by WTSVirtualChannelOpen.
* VirtualClass (input)
* The type of information requested.
* ppBuffer (output)
* Pointer to a buffer pointer, which is allocated upon successful
* return.
* pBytesReturned (output)
* Pointer to a DWORD which is updated with the length of the data
* returned in the allocated buffer upon successful return.
* EXIT:
*
* Returns TRUE if successful otherwise FALSE.
* If successful, the caller is responsible for deallocating the
* buffer returned.
*
****************************************************************************/
BOOL
WINAPI
WTSVirtualChannelQuery(IN HANDLE hChannelHandle,IN WTS_VIRTUAL_CLASS VirtualClass,
OUT PVOID *ppBuffer,OUT DWORD *pBytesReturned)
{
PVCHANDLE VCHandle = (PVCHANDLE) hChannelHandle;
PVOID DataBuffer;
DWORD DataBufferLen;
if (!hChannelHandle || IsBadReadPtr(hChannelHandle,sizeof(HANDLE)))
{
SetLastError(ERROR_INVALID_PARAMETER);
return(FALSE);
}
if (!ValidVCHandle(VCHandle)) {
SetLastError(ERROR_INVALID_PARAMETER);
return(FALSE);
}
if (!ppBuffer || IsBadWritePtr(ppBuffer, sizeof(PVOID)))
{
SetLastError(ERROR_INVALID_PARAMETER);
return(FALSE);
}
if (!pBytesReturned || IsBadWritePtr(pBytesReturned, sizeof(DWORD)))
{
SetLastError(ERROR_INVALID_PARAMETER);
return(FALSE);
}
switch (VirtualClass) {
case WTSVirtualFileHandle:
DataBuffer = LocalAlloc( LPTR, sizeof(HANDLE) );
if ( DataBuffer == NULL ) {
return(FALSE);
}
memcpy(DataBuffer, &VCHandle->hChannel, sizeof(HANDLE) );
*ppBuffer = DataBuffer;
*pBytesReturned = sizeof(HANDLE);
return(TRUE);
break;
case WTSVirtualClientData:
DataBufferLen = sizeof(VIRTUALNAME) + 1024;
for (;;) {
DataBuffer = LocalAlloc( LPTR, DataBufferLen );
if ( DataBuffer == NULL ) {
return(FALSE);
}
memcpy( DataBuffer,VCHandle->VirtualName,sizeof(VIRTUALNAME));
if (WinStationQueryInformationW( VCHandle->hServer,
VCHandle->SessionId,
WinStationVirtualData,
DataBuffer,
DataBufferLen,
&DataBufferLen)) {
*ppBuffer = DataBuffer;
*pBytesReturned = DataBufferLen;
return(TRUE);
}
if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) ||
(DataBufferLen < sizeof(VIRTUALNAME))) {
LocalFree(DataBuffer);
return(FALSE);
}
LocalFree(DataBuffer);
}
break;
default:
SetLastError(ERROR_INVALID_PARAMETER);
return(FALSE);
}
}