/* $Id: fs-win.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */ /** @file * IPRT - File System, Win32. */ /* * Copyright (C) 2006-2022 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 #include #include #include #include #include #include #include #include #include "internal/fs.h" /* from ntdef.h */ typedef LONG NTSTATUS; /* from ntddk.h */ typedef struct _IO_STATUS_BLOCK { union { NTSTATUS Status; PVOID Pointer; }; ULONG_PTR Information; } IO_STATUS_BLOCK, *PIO_STATUS_BLOCK; typedef enum _FSINFOCLASS { FileFsAttributeInformation = 5, } FS_INFORMATION_CLASS, *PFS_INFORMATION_CLASS; /* from ntifs.h */ typedef struct _FILE_FS_ATTRIBUTE_INFORMATION { ULONG FileSystemAttributes; LONG MaximumComponentNameLength; ULONG FileSystemNameLength; WCHAR FileSystemName[1]; } FILE_FS_ATTRIBUTE_INFORMATION, *PFILE_FS_ATTRIBUTE_INFORMATION; extern "C" NTSTATUS NTAPI NtQueryVolumeInformationFile(HANDLE, PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS); /** * Checks quickly if this is an correct root specification. * Root specs ends with a slash of some kind. * * @returns indicator. * @param pszFsPath Path to check. */ static bool rtFsIsRoot(const char *pszFsPath) { /* * UNC has exactly two slashes.. * * Anything else starting with slashe(s) requires * expansion and will have to take the long road. */ if (RTPATH_IS_SLASH(pszFsPath[0])) { if ( !RTPATH_IS_SLASH(pszFsPath[1]) || RTPATH_IS_SLASH(pszFsPath[2])) return false; /* end of machine name */ const char *pszSlash = strpbrk(pszFsPath + 2, "\\/"); if (!pszSlash) return false; /* end of service name. */ pszSlash = strpbrk(pszSlash + 1, "\\/"); if (!pszSlash) return false; return pszSlash[1] == '\0'; } /* * Ok the other alternative is driver letter. */ return pszFsPath[0] >= 'A' && pszFsPath[0] <= 'Z' && pszFsPath[1] == ':' && RTPATH_IS_SLASH(pszFsPath[2]) && !pszFsPath[3]; } /** * Finds the root of the specified volume. * * @returns iprt status code. * @param pszFsPath Path within the filesystem. Verified as one byte or more. * @param ppwszFsRoot Where to store the returned string. Free with rtFsFreeRoot(), */ static int rtFsGetRoot(const char *pszFsPath, PRTUTF16 *ppwszFsRoot) { /* * Do straight forward stuff first, */ if (rtFsIsRoot(pszFsPath)) return RTStrToUtf16(pszFsPath, ppwszFsRoot); /* * Expand and add slash (if required). */ char szFullPath[RTPATH_MAX]; int rc = RTPathAbs(pszFsPath, szFullPath, sizeof(szFullPath)); if (RT_FAILURE(rc)) return rc; size_t cb = strlen(szFullPath); if (!RTPATH_IS_SLASH(szFullPath[cb - 1])) { AssertReturn(cb + 1 < RTPATH_MAX, VERR_FILENAME_TOO_LONG); szFullPath[cb] = '\\'; szFullPath[++cb] = '\0'; } /* * Convert the path. */ rc = RTStrToUtf16(szFullPath, ppwszFsRoot); if (RT_FAILURE(rc)) return rc == VERR_BUFFER_OVERFLOW ? VERR_FILENAME_TOO_LONG : rc; /* * Walk the path until our proper API is happy or there is no more path left. */ PRTUTF16 pwszStart = *ppwszFsRoot; if (!GetVolumeInformationW(pwszStart, NULL, 0, NULL, NULL, 0, NULL, 0)) { PRTUTF16 pwszEnd = pwszStart + RTUtf16Len(pwszStart); PRTUTF16 pwszMin = pwszStart + 2; do { /* Strip off the last path component. */ while (pwszEnd-- > pwszMin) if (RTPATH_IS_SLASH(*pwszEnd)) break; AssertReturn(pwszEnd >= pwszMin, VERR_INTERNAL_ERROR); /* leaks, but that's irrelevant for an internal error. */ pwszEnd[1] = '\0'; } while (!GetVolumeInformationW(pwszStart, NULL, 0, NULL, NULL, 0, NULL, 0)); } return VINF_SUCCESS; } /** * Frees string returned by rtFsGetRoot(). */ static void rtFsFreeRoot(PRTUTF16 pwszFsRoot) { RTUtf16Free(pwszFsRoot); } RTR3DECL(int) RTFsQuerySizes(const char *pszFsPath, RTFOFF *pcbTotal, RTFOFF *pcbFree, uint32_t *pcbBlock, uint32_t *pcbSector) { /* * Validate & get valid root path. */ AssertPtrReturn(pszFsPath, VERR_INVALID_POINTER); AssertReturn(*pszFsPath != '\0', VERR_INVALID_PARAMETER); PRTUTF16 pwszFsRoot; int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot); if (RT_FAILURE(rc)) return rc; /* * Free and total. */ if (pcbTotal || pcbFree) { ULARGE_INTEGER cbTotal; ULARGE_INTEGER cbFree; if (GetDiskFreeSpaceExW(pwszFsRoot, &cbFree, &cbTotal, NULL)) { if (pcbTotal) *pcbTotal = cbTotal.QuadPart; if (pcbFree) *pcbFree = cbFree.QuadPart; } else { DWORD Err = GetLastError(); rc = RTErrConvertFromWin32(Err); Log(("RTFsQuerySizes(%s,): GetDiskFreeSpaceEx failed with lasterr %d (%Rrc)\n", pszFsPath, Err, rc)); } } /* * Block and sector size. */ if ( RT_SUCCESS(rc) && (pcbBlock || pcbSector)) { DWORD dwDummy1, dwDummy2; DWORD cbSector; DWORD cSectorsPerCluster; if (GetDiskFreeSpaceW(pwszFsRoot, &cSectorsPerCluster, &cbSector, &dwDummy1, &dwDummy2)) { if (pcbBlock) *pcbBlock = cbSector * cSectorsPerCluster; if (pcbSector) *pcbSector = cbSector; } else { DWORD Err = GetLastError(); rc = RTErrConvertFromWin32(Err); Log(("RTFsQuerySizes(%s,): GetDiskFreeSpace failed with lasterr %d (%Rrc)\n", pszFsPath, Err, rc)); } } rtFsFreeRoot(pwszFsRoot); return rc; } /** * Query the serial number of a filesystem. * * @returns iprt status code. * @param pszFsPath Path within the mounted filesystem. * @param pu32Serial Where to store the serial number. */ RTR3DECL(int) RTFsQuerySerial(const char *pszFsPath, uint32_t *pu32Serial) { /* * Validate & get valid root path. */ AssertPtrReturn(pszFsPath, VERR_INVALID_POINTER); AssertReturn(*pszFsPath != '\0', VERR_INVALID_PARAMETER); AssertPtrReturn(pu32Serial, VERR_INVALID_POINTER); PRTUTF16 pwszFsRoot; int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot); if (RT_FAILURE(rc)) return rc; /* * Do work. */ DWORD dwMaxName; DWORD dwFlags; DWORD dwSerial; if (GetVolumeInformationW(pwszFsRoot, NULL, 0, &dwSerial, &dwMaxName, &dwFlags, NULL, 0)) *pu32Serial = dwSerial; else { DWORD Err = GetLastError(); rc = RTErrConvertFromWin32(Err); Log(("RTFsQuerySizes(%s,): GetDiskFreeSpaceEx failed with lasterr %d (%Rrc)\n", pszFsPath, Err, rc)); } rtFsFreeRoot(pwszFsRoot); return rc; } /** * Query the properties of a mounted filesystem. * * @returns iprt status code. * @param pszFsPath Path within the mounted filesystem. * @param pProperties Where to store the properties. */ RTR3DECL(int) RTFsQueryProperties(const char *pszFsPath, PRTFSPROPERTIES pProperties) { /* * Validate & get valid root path. */ AssertPtrReturn(pszFsPath, VERR_INVALID_POINTER); AssertReturn(*pszFsPath != '\0', VERR_INVALID_PARAMETER); AssertPtrReturn(pProperties, VERR_INVALID_POINTER); PRTUTF16 pwszFsRoot; int rc = rtFsGetRoot(pszFsPath, &pwszFsRoot); if (RT_FAILURE(rc)) return rc; /* * Do work. */ DWORD dwMaxName; DWORD dwFlags; DWORD dwSerial; if (GetVolumeInformationW(pwszFsRoot, NULL, 0, &dwSerial, &dwMaxName, &dwFlags, NULL, 0)) { memset(pProperties, 0, sizeof(*pProperties)); pProperties->cbMaxComponent = dwMaxName; pProperties->fFileCompression = !!(dwFlags & FILE_FILE_COMPRESSION); pProperties->fCompressed = !!(dwFlags & FILE_VOLUME_IS_COMPRESSED); pProperties->fReadOnly = !!(dwFlags & FILE_READ_ONLY_VOLUME); pProperties->fSupportsUnicode = !!(dwFlags & FILE_UNICODE_ON_DISK); pProperties->fCaseSensitive = false; /* win32 is case preserving only */ /** @todo r=bird: What about FILE_CASE_SENSITIVE_SEARCH ? Is this set for NTFS * as well perchance? If so, better mention it instead of just setting * fCaseSensitive to false. */ pProperties->fRemote = false; /* no idea yet */ } else { DWORD Err = GetLastError(); rc = RTErrConvertFromWin32(Err); Log(("RTFsQuerySizes(%s,): GetVolumeInformation failed with lasterr %d (%Rrc)\n", pszFsPath, Err, rc)); } rtFsFreeRoot(pwszFsRoot); return rc; } RTR3DECL(bool) RTFsIsCaseSensitive(const char *pszFsPath) { return false; } /** * Internal helper for comparing a WCHAR string with a char string. * * @returns @c true if equal, @c false if not. * @param pwsz1 The first string. * @param cch1 The length of the first string, in bytes. * @param psz2 The second string. * @param cch2 The length of the second string. */ static bool rtFsWinAreEqual(WCHAR const *pwsz1, size_t cch1, const char *psz2, size_t cch2) { if (cch1 != cch2 * 2) return false; while (cch2-- > 0) { unsigned ch1 = *pwsz1++; unsigned ch2 = (unsigned char)*psz2++; if (ch1 != ch2) return false; } return true; } RTR3DECL(int) RTFsQueryType(const char *pszFsPath, PRTFSTYPE penmType) { *penmType = RTFSTYPE_UNKNOWN; AssertPtrReturn(pszFsPath, VERR_INVALID_POINTER); AssertReturn(*pszFsPath, VERR_INVALID_PARAMETER); /* * Convert the path and try open it. */ PRTUTF16 pwszFsPath; int rc = RTPathWinFromUtf8(&pwszFsPath, pszFsPath, 0 /*fFlags*/); if (RT_SUCCESS(rc)) { HANDLE hFile = CreateFileW(pwszFsPath, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL); if (hFile != INVALID_HANDLE_VALUE) { /* * Use the NT api directly to get the file system name. */ char abBuf[8192]; IO_STATUS_BLOCK Ios; NTSTATUS rcNt = NtQueryVolumeInformationFile(hFile, &Ios, abBuf, sizeof(abBuf), FileFsAttributeInformation); if (rcNt >= 0) { PFILE_FS_ATTRIBUTE_INFORMATION pFsAttrInfo = (PFILE_FS_ATTRIBUTE_INFORMATION)abBuf; #define IS_FS(szName) \ rtFsWinAreEqual(pFsAttrInfo->FileSystemName, pFsAttrInfo->FileSystemNameLength, szName, sizeof(szName) - 1) if (IS_FS("NTFS")) *penmType = RTFSTYPE_NTFS; else if (IS_FS("FAT")) *penmType = RTFSTYPE_FAT; else if (IS_FS("FAT32")) *penmType = RTFSTYPE_FAT; else if (IS_FS("EXFAT")) *penmType = RTFSTYPE_EXFAT; else if (IS_FS("VBoxSharedFolderFS")) *penmType = RTFSTYPE_VBOXSHF; #undef IS_FS } else rc = RTErrConvertFromNtStatus(rcNt); CloseHandle(hFile); } else rc = RTErrConvertFromWin32(GetLastError()); RTPathWinFree(pwszFsPath); } return rc; }