/* $Id: RTNtPathExpand8dot3Path.cpp 60481 2016-04-13 20:14:41Z vboxsync $ */ /** @file * IPRT - Native NT, RTNtPathExpand8dot3Path. */ /* * Copyright (C) 2006-2016 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 #else # include #endif #include #include /** * 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) 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_READ_DATA | 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); } /* Advance */ pwszFix = pwszFixEnd; } if (puBuf) RTMemFree(puBuf); if (pUniStr->Length < pUniStr->MaximumLength) pUniStr->Buffer[pUniStr->Length / sizeof(WCHAR)] = '\0'; return rc; }