| 1 | /* $Id: pathint-win.cpp 74461 2018-09-25 15:55:40Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Windows, Internal Path stuff.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2018 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.alldomusa.eu.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_FS
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| 32 | #include <iprt/path.h>
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| 33 |
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/ctype.h>
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| 36 | #include <iprt/err.h>
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| 37 | #include <iprt/string.h>
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| 38 |
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| 39 | #include <iprt/nt/nt-and-windows.h>
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| 40 |
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| 41 | /*********************************************************************************************************************************
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| 42 | * Defined Constants And Macros *
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| 43 | *********************************************************************************************************************************/
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| 44 | /** The max number of non-null characters we pass to an Win32 API.
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| 45 | * You would think that MAX_PATH gives this length, however CreateDirectoryW was
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| 46 | * found to fail on Windows 10 (1803++) if given a perfectly formed path argument
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| 47 | * of 248 or more characters. Same when going thru UNC.
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| 48 | *
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| 49 | * So, to be conservative, we put the max number of characters in a non-\\?\
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| 50 | * path to 243, not counting the terminator.
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| 51 | */
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| 52 | #define ACTUAL_MAX_PATH 243
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| 53 |
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| 54 |
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| 55 | DECL_NO_INLINE(static, bool) rtPathWinTryConvertToAbs(PRTUTF16 *ppwszPath)
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| 56 | {
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| 57 | RTUTF16 wszFullPath[MAX_PATH + 1];
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| 58 | DWORD cwcFull = GetFullPathNameW(*ppwszPath, MAX_PATH + 1, wszFullPath, NULL);
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| 59 | if (cwcFull <= ACTUAL_MAX_PATH)
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| 60 | {
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| 61 | RTUtf16Free(*ppwszPath);
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| 62 | PRTUTF16 const pwszCopy = RTUtf16Dup(wszFullPath);
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| 63 | *ppwszPath = pwszCopy;
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| 64 | if (pwszCopy)
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| 65 | return true;
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| 66 | }
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| 67 | return false;
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| 68 | }
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| 69 |
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| 70 |
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| 71 | RTDECL(int) RTPathWinFromUtf8(PRTUTF16 *ppwszPath, const char *pszPath, uint32_t fFlags)
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| 72 | {
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| 73 | Assert(fFlags == 0);
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| 74 | RT_NOREF(fFlags);
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| 75 |
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| 76 | /*
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| 77 | * Do a straight conversion first.
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| 78 | */
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| 79 | *ppwszPath = NULL;
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| 80 | size_t cwcResult = 0;
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| 81 | int rc = RTStrToUtf16Ex(pszPath, RTSTR_MAX, ppwszPath, 0, &cwcResult);
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| 82 | if (RT_SUCCESS(rc))
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| 83 | {
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| 84 | /*
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| 85 | * Check the resulting length. This is straight forward for absolute
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| 86 | * paths, but gets complicated for relative ones.
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| 87 | */
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| 88 | if (cwcResult <= ACTUAL_MAX_PATH)
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| 89 | {
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| 90 | if (RT_C_IS_ALPHA(pszPath[0]) && pszPath[1] == ':')
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| 91 | {
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| 92 | if (RTPATH_IS_SLASH(pszPath[2]))
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| 93 | return VINF_SUCCESS;
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| 94 |
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| 95 | /* Drive relative path. Found no simple way of getting the current
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| 96 | path of a drive, so we try convert it to an absolute path and see
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| 97 | how that works out. It is what the API we're calling will have to
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| 98 | do anyway, so this should perform just as well. */
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| 99 | if (rtPathWinTryConvertToAbs(ppwszPath))
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| 100 | return VINF_SUCCESS;
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| 101 | }
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| 102 | else if (RTPATH_IS_SLASH(pszPath[0]))
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| 103 | {
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| 104 | if ( RTPATH_IS_SLASH(pszPath[1])
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| 105 | && !RTPATH_IS_SLASH(pszPath[2])
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| 106 | && pszPath[2] != '\0')
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| 107 | {
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| 108 | /* Passthru prefix '\\?\' is fine. */
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| 109 | if ( pszPath[2] == '?'
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| 110 | && !RTPATH_IS_SLASH(pszPath[3]))
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| 111 | return VINF_SUCCESS;
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| 112 |
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| 113 | /* UNC requires a longer prefix ('\??\UNC\' instead of '\??\'), so
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| 114 | subtract 3 chars from the max limit to be on the safe side. */
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| 115 | if (cwcResult <= ACTUAL_MAX_PATH - 3)
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| 116 | return VINF_SUCCESS;
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| 117 | }
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| 118 | else
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| 119 | {
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| 120 | /* Drive relative. Win32 will prepend a two letter drive specification. */
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| 121 | if (cwcResult <= ACTUAL_MAX_PATH - 2)
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| 122 | return VINF_SUCCESS;
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| 123 | }
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| 124 | }
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| 125 | else
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| 126 | {
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| 127 | /* Relative to CWD. We can use the API to get it's current length.
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| 128 | Any race conditions here is entirely the caller's problem. */
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| 129 | size_t cwcCwd = GetCurrentDirectoryW(0, NULL);
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| 130 | if (cwcCwd + cwcResult <= ACTUAL_MAX_PATH - 1)
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| 131 | return VINF_SUCCESS;
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| 132 | }
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| 133 | }
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| 134 | /*
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| 135 | * We're good if the caller already supplied the passthru/length prefix: '\\?\'
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| 136 | */
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| 137 | else if ( pszPath[1] == '?'
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| 138 | && RTPATH_IS_SLASH(pszPath[3])
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| 139 | && RTPATH_IS_SLASH(pszPath[1])
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| 140 | && RTPATH_IS_SLASH(pszPath[0]))
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| 141 | return VINF_SUCCESS;
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| 142 |
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| 143 | /*
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| 144 | * Long path requiring \\?\ prefixing.
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| 145 | *
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| 146 | * We piggy back on the NT conversion here and ASSUME RTUtf16Free is the right
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| 147 | * way to free the result.
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| 148 | */
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| 149 | RTUtf16Free(*ppwszPath);
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| 150 | *ppwszPath = NULL;
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| 151 |
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| 152 | struct _UNICODE_STRING NtName = { 0, 0, NULL };
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| 153 | HANDLE hRootDir = NULL;
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| 154 | rc = RTNtPathFromWinUtf8(&NtName, &hRootDir, pszPath);
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| 155 | if (RT_SUCCESS(rc))
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| 156 | {
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| 157 | /* No root dir handle. */
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| 158 | if (hRootDir == NULL)
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| 159 | {
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| 160 | /* Convert the NT '\??\' prefix to a win32 passthru prefix '\\?\' */
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| 161 | if ( NtName.Buffer[0] == '\\'
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| 162 | && NtName.Buffer[1] == '?'
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| 163 | && NtName.Buffer[2] == '?'
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| 164 | && NtName.Buffer[3] == '\\')
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| 165 | {
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| 166 | NtName.Buffer[1] = '\\';
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| 167 |
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| 168 | /* Zero termination paranoia. */
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| 169 | if (NtName.Buffer[NtName.Length / sizeof(RTUTF16)] == '\0')
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| 170 | {
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| 171 | *ppwszPath = NtName.Buffer;
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| 172 | return VINF_SUCCESS;
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| 173 | }
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| 174 | AssertMsgFailed(("Length=%u %.*ls\n", NtName.Length, NtName.Length / sizeof(RTUTF16), NtName.Buffer));
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| 175 | }
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| 176 | else
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| 177 | AssertMsgFailed(("%ls\n", NtName.Buffer));
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| 178 | }
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| 179 | else
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| 180 | AssertMsgFailed(("%s\n", pszPath));
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| 181 | RTNtPathFree(&NtName, &hRootDir);
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| 182 | }
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| 183 | }
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| 184 | return rc;
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| 185 | }
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| 186 |
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| 187 |
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| 188 | RTDECL(void) RTPathWinFree(PRTUTF16 pwszPath)
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| 189 | {
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| 190 | RTUtf16Free(pwszPath);
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| 191 | }
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| 192 |
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