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/* $Id: RTNtPathExpand8dot3Path.cpp $ */
/** @file
* IPRT - Native NT, RTNtPathExpand8dot3Path.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_FS
#ifdef IN_SUP_HARDENED_R3
# include <iprt/nt/nt-and-windows.h>
#else
# include <iprt/nt/nt.h>
#endif
#include <iprt/mem.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
/**
* Fixes up a path possibly containing one or more alternative 8-dot-3 style
* components.
*
* The path is fixed up in place. Errors are ignored.
*
* @returns VINF_SUCCESS if it all went smoothly, informational status codes
* indicating the nature of last problem we ran into.
*
* @param pUniStr The path to fix up. MaximumLength is the max buffer
* length.
* @param fPathOnly Whether to only process the path and leave the filename
* as passed in.
*/
RTDECL(int) RTNtPathExpand8dot3Path(PUNICODE_STRING pUniStr, bool fPathOnly)
{
int rc = VINF_SUCCESS;
/*
* We could use FileNormalizedNameInformation here and slap the volume device
* path in front of the result, but it's only supported since windows 8.0
* according to some docs... So we expand all supicious names.
*/
union fix8dot3tmp
{
FILE_BOTH_DIR_INFORMATION Info;
uint8_t abBuffer[sizeof(FILE_BOTH_DIR_INFORMATION) + 2048 * sizeof(WCHAR)];
} *puBuf = NULL;
PRTUTF16 pwszFix = pUniStr->Buffer;
while (*pwszFix)
{
pwszFix = RTNtPathFindPossible8dot3Name(pwszFix);
if (pwszFix == NULL)
break;
RTUTF16 wc;
PRTUTF16 pwszFixEnd = pwszFix;
while ((wc = *pwszFixEnd) != '\0' && wc != '\\' && wc != '/')
pwszFixEnd++;
if (wc == '\0' && fPathOnly)
break;
if (!puBuf)
{
puBuf = (union fix8dot3tmp *)RTMemAlloc(sizeof(*puBuf));
if (!puBuf)
{
rc = -VERR_NO_MEMORY;
break;
}
}
RTUTF16 const wcSaved = *pwszFix;
*pwszFix = '\0'; /* paranoia. */
UNICODE_STRING NtDir;
NtDir.Buffer = pUniStr->Buffer;
NtDir.Length = NtDir.MaximumLength = (USHORT)((pwszFix - pUniStr->Buffer) * sizeof(WCHAR));
HANDLE hDir = RTNT_INVALID_HANDLE_VALUE;
IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
OBJECT_ATTRIBUTES ObjAttr;
InitializeObjectAttributes(&ObjAttr, &NtDir, OBJ_CASE_INSENSITIVE, NULL /*hRootDir*/, NULL /*pSecDesc*/);
#ifdef IN_RING0
ObjAttr.Attributes |= OBJ_KERNEL_HANDLE;
#endif
NTSTATUS rcNt = NtCreateFile(&hDir,
FILE_LIST_DIRECTORY | SYNCHRONIZE,
&ObjAttr,
&Ios,
NULL /* Allocation Size*/,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
FILE_OPEN,
FILE_DIRECTORY_FILE | FILE_OPEN_FOR_BACKUP_INTENT | FILE_SYNCHRONOUS_IO_NONALERT,
NULL /*EaBuffer*/,
0 /*EaLength*/);
*pwszFix = wcSaved;
if (NT_SUCCESS(rcNt))
{
RT_ZERO(*puBuf);
IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
UNICODE_STRING NtFilterStr;
NtFilterStr.Buffer = pwszFix;
NtFilterStr.Length = (USHORT)((uintptr_t)pwszFixEnd - (uintptr_t)pwszFix);
NtFilterStr.MaximumLength = NtFilterStr.Length;
rcNt = NtQueryDirectoryFile(hDir,
NULL /* Event */,
NULL /* ApcRoutine */,
NULL /* ApcContext */,
&Ios,
puBuf,
sizeof(*puBuf) - sizeof(WCHAR),
FileBothDirectoryInformation,
FALSE /*ReturnSingleEntry*/,
&NtFilterStr,
FALSE /*RestartScan */);
if (NT_SUCCESS(rcNt) && puBuf->Info.NextEntryOffset == 0) /* There shall only be one entry matching... */
{
uint32_t offName = puBuf->Info.FileNameLength / sizeof(WCHAR);
while (offName > 0 && puBuf->Info.FileName[offName - 1] != '\\' && puBuf->Info.FileName[offName - 1] != '/')
offName--;
uint32_t cwcNameNew = (puBuf->Info.FileNameLength / sizeof(WCHAR)) - offName;
uint32_t cwcNameOld = (uint32_t)(pwszFixEnd - pwszFix);
if (cwcNameOld == cwcNameNew)
memcpy(pwszFix, &puBuf->Info.FileName[offName], cwcNameNew * sizeof(WCHAR));
else if ( pUniStr->Length + cwcNameNew * sizeof(WCHAR) - cwcNameOld * sizeof(WCHAR) + sizeof(WCHAR)
<= pUniStr->MaximumLength)
{
size_t cwcLeft = pUniStr->Length - (pwszFixEnd - pUniStr->Buffer) * sizeof(WCHAR) + sizeof(WCHAR);
memmove(&pwszFix[cwcNameNew], pwszFixEnd, cwcLeft * sizeof(WCHAR));
pUniStr->Length -= (USHORT)(cwcNameOld * sizeof(WCHAR));
pUniStr->Length += (USHORT)(cwcNameNew * sizeof(WCHAR));
pwszFixEnd -= cwcNameOld;
pwszFixEnd += cwcNameNew;
memcpy(pwszFix, &puBuf->Info.FileName[offName], cwcNameNew * sizeof(WCHAR));
}
else
rc = VINF_BUFFER_OVERFLOW;
}
else if (NT_SUCCESS(rcNt))
rc = -VERR_DUPLICATE;
else
{
rc = -RTErrConvertFromNtStatus(rcNt);
if (rc < 0)
rc = -rc;
}
NtClose(hDir);
}
else
rc = -RTErrConvertFromNtStatus(rcNt);
/* Advance */
pwszFix = pwszFixEnd;
}
if (puBuf)
RTMemFree(puBuf);
if (pUniStr->Length < pUniStr->MaximumLength)
pUniStr->Buffer[pUniStr->Length / sizeof(WCHAR)] = '\0';
return rc;
}
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