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406 lines
11 KiB
406 lines
11 KiB
/*++
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Copyright (c) 1991-1992 Microsoft Corporation
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Module Name:
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Examine.c
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Abstract:
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This module contains Remote Admin Protocol (RAP) routines. These routines
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are shared between XactSrv and RpcXlate.
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Author:
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David Treadwell (davidtr) 07-Jan-1991
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Environment:
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Portable to any flat, 32-bit environment. (Uses Win32 typedefs.)
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Requires ANSI C extensions: slash-slash comments, long external names.
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Revision History:
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05-Mar-1991 JohnRo
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Converted from Xs (XactSrv) to Rap (Remote Admin Protocol) names.
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15-Mar-1991 W-Shanku
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Additional character support; changes to make code neater.
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14-Apr-1991 JohnRo
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Reduce recompiles.
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15-May-1991 JohnRo
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Added first cut at native vs. RAP handling.
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Added support for REM_SEND_LENBUF for print APIs.
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04-Jun-1991 JohnRo
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Made changes suggested by PC-LINT.
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11-Jul-1991 JohnRo
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Support StructureAlignment parameter.
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07-Oct-1991 JohnRo
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Made changes suggested by PC-LINT.
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16-Aug-1992 JohnRo
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RAID 2920: Support UTC timezone in net code.
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Use PREFIX_ equates.
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--*/
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// These must be included first:
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#include <windef.h> // IN, LPDWORD, NULL, OPTIONAL, DWORD, etc.
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#include <lmcons.h> // NET_API_STATUS
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// These may be included in any order:
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#include <align.h> // ALIGN_WORD, etc.
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#include <netdebug.h> // NetpAssert().
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#include <prefix.h> // PREFIX_ equates.
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#include <rap.h> // My prototype, LPDESC.
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#include <remtypes.h> // REM_WORD, etc.
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VOID
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RapExamineDescriptor (
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IN LPDESC DescriptorString,
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IN LPDWORD ParmNum OPTIONAL,
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OUT LPDWORD StructureSize OPTIONAL,
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OUT LPDWORD LastPointerOffset OPTIONAL,
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OUT LPDWORD AuxDataCountOffset OPTIONAL,
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OUT LPDESC * ParmNumDescriptor OPTIONAL,
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OUT LPDWORD StructureAlignment OPTIONAL,
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IN RAP_TRANSMISSION_MODE TransmissionMode,
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IN BOOL Native
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)
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/*++
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Routine Description:
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Performs various examination functions on a descriptor string, including
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- finding the size of the fixed structure.
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- finding the last pointer to variable-length data in the structure.
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- finding the auxiliary descriptor character in the string.
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- finding the type of a given field in the descriptor.
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These functions traverse the descriptor string in a similar manner, and
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are thus grouped together, with wrappers for individual functions
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elsewhere.
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Arguments:
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DescriptorString - a string that describes a fixed-length structure.
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ParmNum - an optional pointer to a DWORD indicating the field within
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the descriptor to find.
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StructureSize - a pointer to a DWORD to receive the size, in bytes,
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of the structure.
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LastPointerOffset - a pointer to a DWORD to receive the last pointer
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to variable-length data in the structure. If there is no pointer
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in the structure, the DWORD receives the constant value
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NO_POINTER_IN_STRUCTURE.
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AuxDataCountOffset - an optional pointer to a DWORD to receive the offset
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of the auxiliary data structure count. This is set to
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NO_AUX_DATA if none is found.
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ParmNumDescriptor - an optional pointer to a LPDESC to receive a
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pointer to a specific field within the descriptor.
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StructureAlignment - an optional pointer to a DWORD to receive the
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alignment of this structure if it must be aligned and padded to appear
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in an array. (This will be set to 1 if no alignment is necessary.)
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Transmission Mode - Indicates whether this array is part of a response,
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a request, or both.
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Native - TRUE iff the descriptor defines a native structure. (This flag is
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used to decide whether or not to align fields.)
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Return Value:
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None.
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--*/
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{
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LPDESC s;
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DWORD field;
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DWORD size = 0;
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DWORD auxDataCountOffset = NO_AUX_DATA;
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DWORD lastPointerOffset = NO_POINTER_IN_STRUCTURE;
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LPDESC parmNumDescriptor = NULL;
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DWORD worstAlignmentSoFar = ALIGN_BYTE;
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#define UPDATE_WORST_ALIGNMENT(value) \
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if ( (value) > worstAlignmentSoFar) { \
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worstAlignmentSoFar = value; \
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}
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#define POINTER_SIZE (Native ? sizeof(PVOID) : sizeof(DWORD))
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//
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// Check for wierdness that could break null pointer handling.
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//
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NetpAssert(sizeof(LPSTR) == sizeof(LPVOID));
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//
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// Walk through the descriptor string, updating the length count
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// for each field described.
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//
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field = 1;
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for ( s = DescriptorString; *s != '\0'; field++ ) {
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if (( ParmNum != NULL ) && ( *ParmNum == field )) {
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parmNumDescriptor = s;
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}
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switch ( *(s++) ) {
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case REM_RCV_BYTE_PTR:
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if (TransmissionMode == Request) {
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//
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// These aren't sent as part of request. Just skip past any
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// array size numeric characters in descriptor.
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//
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(void) RapAsciiToDecimal( &s );
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break;
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}
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/* FALLTHROUGH */
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case REM_BYTE:
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//
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// A byte or array of bytes.
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//
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size += sizeof(CHAR) * RapDescArrayLength( s );
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UPDATE_WORST_ALIGNMENT( ALIGN_BYTE );
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break;
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case REM_BYTE_PTR:
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case REM_FILL_BYTES:
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//
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// A pointer to a byte or array of bytes.
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//
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if (TransmissionMode == Response ) {
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//
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// In a response (Xactsrv-style) context, this type
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// is allocated enough room for the pointer. Also skip
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// over any array size numeric characters.
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//
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size = RapPossiblyAlignCount(size, ALIGN_LPBYTE, Native);
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UPDATE_WORST_ALIGNMENT( ALIGN_LPBYTE );
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lastPointerOffset = size;
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size += POINTER_SIZE;
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} else {
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size += POINTER_SIZE;
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UPDATE_WORST_ALIGNMENT( ALIGN_BYTE );
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}
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//
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// must move the descriptor past any arraylength info
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//
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(void) RapAsciiToDecimal( &s );
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break;
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case REM_RCV_WORD_PTR :
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case REM_SEND_BUF_LEN :
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if (TransmissionMode == Request) {
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//
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// These aren't sent as part of request. Just skip past any
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// array size numeric characters in descriptor.
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//
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(void) RapAsciiToDecimal( &s );
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break;
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}
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/* FALLTHROUGH */
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case REM_WORD:
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case REM_PARMNUM:
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case REM_RCV_BUF_LEN:
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case REM_ENTRIES_READ:
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//
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// A word or array of words.
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//
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size = RapPossiblyAlignCount(size, ALIGN_WORD, Native);
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size += sizeof(WORD) * RapDescArrayLength( s );
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UPDATE_WORST_ALIGNMENT( ALIGN_WORD );
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break;
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case REM_RCV_DWORD_PTR :
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if (TransmissionMode == Request) {
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//
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// These aren't sent as part of request. Just skip past any
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// array size numeric characters in descriptor.
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//
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(void) RapAsciiToDecimal( &s );
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break;
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}
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/* FALLTHROUGH */
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case REM_DWORD:
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case REM_SIGNED_DWORD:
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//
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// A doubleword or array of doublewords.
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//
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size = RapPossiblyAlignCount(size, ALIGN_DWORD, Native);
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size += sizeof(DWORD) * RapDescArrayLength( s );
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UPDATE_WORST_ALIGNMENT( ALIGN_DWORD );
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break;
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case REM_ASCIZ: // ptr to ASCIIZ string
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case REM_ASCIZ_TRUNCATABLE: // ptr to truncatable ASCIZ string
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size = RapPossiblyAlignCount(size, ALIGN_LPSTR, Native);
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lastPointerOffset = size;
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size += POINTER_SIZE;
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UPDATE_WORST_ALIGNMENT( ALIGN_LPBYTE );
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(void) RapDescStringLength( s );
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break;
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case REM_SEND_BUF_PTR: // ptr to send buffer
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case REM_SEND_LENBUF: // FAR ptr to send buffer w/ len.
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if (TransmissionMode == Request) {
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//
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// These aren't sent as part of request.
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//
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break;
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}
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/* FALLTHROUGH */
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case REM_RCV_BUF_PTR: // ptr to receive buffer
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size = RapPossiblyAlignCount(size, ALIGN_LPBYTE, Native);
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lastPointerOffset = size;
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/* FALLTHROUGH */
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case REM_NULL_PTR: // null ptr
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size = RapPossiblyAlignCount(size, ALIGN_LPSTR, Native);
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size += POINTER_SIZE;
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UPDATE_WORST_ALIGNMENT( ALIGN_LPBYTE );
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break;
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case REM_AUX_NUM: // 16-bit aux. data count
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size = RapPossiblyAlignCount(size, ALIGN_WORD, Native);
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auxDataCountOffset = size;
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size += sizeof(WORD);
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UPDATE_WORST_ALIGNMENT( ALIGN_WORD );
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break;
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case REM_AUX_NUM_DWORD: // 32-bit aux. data count
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size = RapPossiblyAlignCount(size, ALIGN_DWORD, Native);
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auxDataCountOffset = size;
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size += sizeof(DWORD);
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UPDATE_WORST_ALIGNMENT( ALIGN_DWORD );
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break;
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case REM_IGNORE :
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case REM_UNSUPPORTED_FIELD :
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//
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// A placeholder for pad bytes. It represents no space in the
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// structure.
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//
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break;
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case REM_EPOCH_TIME_GMT: /*FALLTHROUGH*/
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case REM_EPOCH_TIME_LOCAL:
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//
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// A time in seconds since 1970. 32-bits, unsigned.
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//
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size = RapPossiblyAlignCount(size, ALIGN_DWORD, Native);
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size += sizeof(DWORD);
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UPDATE_WORST_ALIGNMENT( ALIGN_DWORD );
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break;
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default:
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// !!!!
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NetpKdPrint(( PREFIX_NETRAP
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"RapExamineDescriptor: unsupported character: "
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FORMAT_DESC_CHAR " at " FORMAT_LPVOID ".\n",
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*(s - 1), s - 1 ));
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NetpAssert(FALSE);
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}
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}
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//
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// Set up return information as appropriate.
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//
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if ( StructureSize != NULL ) {
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*StructureSize = size;
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}
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if ( LastPointerOffset != NULL ) {
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*LastPointerOffset = lastPointerOffset;
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}
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if ( AuxDataCountOffset != NULL ) {
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*AuxDataCountOffset = auxDataCountOffset;
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}
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if ( ParmNumDescriptor != NULL ) {
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*ParmNumDescriptor = parmNumDescriptor;
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}
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if ( StructureAlignment != NULL ) {
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*StructureAlignment = worstAlignmentSoFar;
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}
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return;
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} // RapExamineDescriptor
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