/* $Id: fileioutils-nt.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * IPRT - File I/O, common NT helpers. */ /* * Copyright (C) 2006-2020 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 * *********************************************************************************************************************************/ #include #include "internal/iprt.h" #include #include "internal/file.h" /** * Helper for converting RTFILE_O_XXX to the various NtCreateFile flags. * * @returns IPRT status code * @param fOpen The RTFILE_O_XXX flags to convert. * @param pfDesiredAccess Where to return the desired access mask. * @param pfObjAttribs Where to return the NT object attributes. * @param pfFileAttribs Where to return the file attributes (create). * @param pfShareAccess Where to return the file sharing access mask. * @param pfCreateDisposition Where to return the file create disposition. * @param pfCreateOptions Where to return the file open/create options. */ DECLHIDDEN(int) rtFileNtValidateAndConvertFlags(uint64_t fOpen, uint32_t *pfDesiredAccess, uint32_t *pfObjAttribs, uint32_t *pfFileAttribs, uint32_t *pfShareAccess, uint32_t *pfCreateDisposition, uint32_t *pfCreateOptions) { /* * Merge forced open flags and validate them. */ int rc = rtFileRecalcAndValidateFlags(&fOpen); if (RT_FAILURE(rc)) return rc; /* * Determine disposition, access, share mode, creation flags, and security attributes * for the CreateFile API call. */ ULONG fCreateDisposition; switch (fOpen & RTFILE_O_ACTION_MASK) { case RTFILE_O_OPEN: fCreateDisposition = fOpen & RTFILE_O_TRUNCATE ? FILE_OVERWRITE : FILE_OPEN; break; case RTFILE_O_OPEN_CREATE: fCreateDisposition = FILE_OPEN_IF; break; case RTFILE_O_CREATE: fCreateDisposition = FILE_CREATE; break; case RTFILE_O_CREATE_REPLACE: fCreateDisposition = FILE_SUPERSEDE; break; default: AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen)); return VERR_INVALID_PARAMETER; } ACCESS_MASK fDesiredAccess; switch (fOpen & RTFILE_O_ACCESS_MASK) { case RTFILE_O_READ: fDesiredAccess = FILE_GENERIC_READ; /* RTFILE_O_APPEND is ignored. */ break; case RTFILE_O_WRITE: fDesiredAccess = fOpen & RTFILE_O_APPEND ? FILE_GENERIC_WRITE & ~FILE_WRITE_DATA : FILE_GENERIC_WRITE; break; case RTFILE_O_READWRITE: fDesiredAccess = fOpen & RTFILE_O_APPEND ? FILE_GENERIC_READ | (FILE_GENERIC_WRITE & ~FILE_WRITE_DATA) : FILE_GENERIC_READ | FILE_GENERIC_WRITE; break; case RTFILE_O_ATTR_ONLY: if (fOpen & RTFILE_O_ACCESS_ATTR_MASK) { fDesiredAccess = 0; break; } RT_FALL_THRU(); default: AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen)); return VERR_INVALID_PARAMETER; } if (fCreateDisposition == FILE_OVERWRITE) /* Required for truncating the file (see MSDN), it is *NOT* part of FILE_GENERIC_WRITE. */ fDesiredAccess |= GENERIC_WRITE; /* RTFileSetMode needs following rights as well. */ switch (fOpen & RTFILE_O_ACCESS_ATTR_MASK) { case RTFILE_O_ACCESS_ATTR_READ: fDesiredAccess |= FILE_READ_ATTRIBUTES | SYNCHRONIZE; break; case RTFILE_O_ACCESS_ATTR_WRITE: fDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break; case RTFILE_O_ACCESS_ATTR_READWRITE: fDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break; default: /* Attributes access is the same as the file access. */ switch (fOpen & RTFILE_O_ACCESS_MASK) { case RTFILE_O_READ: fDesiredAccess |= FILE_READ_ATTRIBUTES | SYNCHRONIZE; break; case RTFILE_O_WRITE: fDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break; case RTFILE_O_READWRITE: fDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break; default: AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen)); return VERR_INVALID_PARAMETER; } } ULONG fShareAccess; switch (fOpen & RTFILE_O_DENY_MASK) { case RTFILE_O_DENY_NONE: fShareAccess = FILE_SHARE_READ | FILE_SHARE_WRITE; break; case RTFILE_O_DENY_READ: fShareAccess = FILE_SHARE_WRITE; break; case RTFILE_O_DENY_WRITE: fShareAccess = FILE_SHARE_READ; break; case RTFILE_O_DENY_READWRITE: fShareAccess = 0; break; case RTFILE_O_DENY_NOT_DELETE: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE; break; case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READ: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_WRITE; break; case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_WRITE: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_READ; break; case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READWRITE:fShareAccess = FILE_SHARE_DELETE; break; default: AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen)); return VERR_INVALID_PARAMETER; } ULONG fObjAttribs = 0; if (fOpen & RTFILE_O_INHERIT) fObjAttribs = OBJ_INHERIT; ULONG fCreateOptions = FILE_NON_DIRECTORY_FILE; if (fOpen & RTFILE_O_WRITE_THROUGH) fCreateOptions |= FILE_WRITE_THROUGH; if (!(fOpen & RTFILE_O_ASYNC_IO)) fCreateOptions |= FILE_SYNCHRONOUS_IO_NONALERT; if (fOpen & RTFILE_O_NO_CACHE) { fCreateOptions |= FILE_NO_INTERMEDIATE_BUFFERING; fDesiredAccess &= ~FILE_APPEND_DATA; } /* * Done. */ *pfDesiredAccess = fDesiredAccess; *pfObjAttribs = fObjAttribs; *pfFileAttribs = FILE_ATTRIBUTE_NORMAL; *pfShareAccess = fShareAccess; *pfCreateDisposition = fCreateDisposition; *pfCreateOptions = fCreateOptions; return VINF_SUCCESS; }