/*++

Copyright (c) 1993  Microsoft Corporation

Module Name:

    util.c

Abstract:

    This module contains miscellaneous utility routines used by the
    NetWare Workstation service.

Author:

    Rita Wong  (ritaw)   08-Feb-1993

Revision History:

--*/

#include <nw.h>
#include <nwstatus.h>

//
// Debug trace flag for selecting which trace statements to output
//
#if DBG

DWORD WorkstationTrace = 0;

#endif // DBG



// Terminal Server Addition - 
DWORD
NwImpersonateClient(
    VOID
    )
/*++

Routine Description:

    This function calls RpcImpersonateClient to impersonate the current caller
    of an API.

Arguments:

    None.

Return Value:

    NO_ERROR or reason for failure.

--*/
{
    DWORD status;


    if ((status = RpcImpersonateClient(NULL)) != NO_ERROR) {
        KdPrint(("NWWORKSTATION: Fail to impersonate client %ld\n", status));
    }

    return status;
}


// Terminal Server Addition - 
DWORD
NwRevertToSelf(
    VOID
    )
/*++

Routine Description:

    This function calls RpcRevertToSelf to undo an impersonation.

Arguments:

    None.

Return Value:

    NO_ERROR or reason for failure.

--*/
{
    DWORD status;


    if ((status = RpcRevertToSelf()) != NO_ERROR) {
        KdPrint(("NWWORKSTATION: Fail to revert to self %ld\n", status));
        ASSERT(FALSE);
    }

    return status;
}


VOID
NwLogEvent(
    DWORD MessageId,
    DWORD NumberOfSubStrings,
    LPWSTR *SubStrings,
    DWORD ErrorCode
    )
{

    HANDLE LogHandle;


    LogHandle = RegisterEventSourceW (
                    NULL,
                    NW_WORKSTATION_SERVICE
                    );

    if (LogHandle == NULL) {
        KdPrint(("NWWORKSTATION: RegisterEventSourceW failed %lu\n",
                 GetLastError()));
        return;
    }

    if (ErrorCode == NO_ERROR) {

        //
        // No error codes were specified
        //
        (void) ReportEventW(
                   LogHandle,
                   EVENTLOG_ERROR_TYPE,
                   0,            // event category
                   MessageId,
                   (PSID) NULL,
                   (WORD) NumberOfSubStrings,
                   0,
                   SubStrings,
                   (PVOID) NULL
                   );

    }
    else {

        //
        // Log the error code specified as binary data
        //
        (void) ReportEventW(
                   LogHandle,
                   EVENTLOG_ERROR_TYPE,
                   0,            // event category
                   MessageId,
                   (PSID) NULL,
                   (WORD) NumberOfSubStrings,
                   sizeof(DWORD),
                   SubStrings,
                   (PVOID) &ErrorCode
                   );
    }

    DeregisterEventSource(LogHandle);
}



//---------------------------------------------------------------------------------//
// NwGetSessionId - This routine assumed that the thread is already executed in    //
// the client context. It just get the session ID without impersonating.           //
//---------------------------------------------------------------------------------// 

NTSTATUS
NwGetSessionId(
    OUT PULONG pSessionId
    )
/*++

Routine Description:

    This function gets the session id of the current thread.

    Arguments:

    pSessionId - Returns the session id of the current process.

Return Value:

    DWORD - NERR_Success or reason for failure.

--*/
{
    NTSTATUS ntstatus;
    HANDLE CurrentThreadToken;
    ULONG SessionId;
    ULONG ReturnLength;


    ntstatus = NtOpenThreadToken(
                   NtCurrentThread(),
                   TOKEN_QUERY,
                   TRUE,              // Use workstation service's security
                                      // context to open thread token
                   &CurrentThreadToken
                   );


    if (! NT_SUCCESS(ntstatus)) {
        KdPrint(("[Wksta] Cannot open the current thread token %08lx\n",
                     ntstatus));
        goto Exit;
    }

    //
    // Get the session id of the current thread
    //


    ntstatus = NtQueryInformationToken(
                  CurrentThreadToken,
                  TokenSessionId,
                  &SessionId,
                  sizeof(ULONG),
                  &ReturnLength
                  );


    if (! NT_SUCCESS(ntstatus)) {
        KdPrint(("[Wksta] Cannot query current thread's token %08lx\n",
                     ntstatus));
        NtClose(CurrentThreadToken);
        goto Exit;
    }


    NtClose(CurrentThreadToken);

    *pSessionId = SessionId;

Exit:

    return ntstatus;
}