| 1 | /* $Id: vbsfpathabs.cpp 75506 2018-11-16 02:38:27Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Shared Folders Service - guest/host path convertion and verification.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2017 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.virtualbox.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 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
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| 23 | #include <iprt/path.h>
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| 24 | #include <iprt/string.h>
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| 25 |
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| 26 |
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| 27 | #if defined(RT_OS_WINDOWS)
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| 28 | static void vbsfPathResolveRelative(char *pszPathBegin)
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| 29 | {
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| 30 | char *pszCur = pszPathBegin;
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| 31 | char * const pszTop = pszCur;
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| 32 |
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| 33 | /*
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| 34 | * Get rid of double dot path components by evaluating them.
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| 35 | */
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| 36 | for (;;)
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| 37 | {
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| 38 | char const chFirst = pszCur[0];
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| 39 | if ( chFirst == '.'
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| 40 | && pszCur[1] == '.'
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| 41 | && (!pszCur[2] || pszCur[2] == RTPATH_SLASH))
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| 42 | {
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| 43 | /* rewind to the previous component if any */
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| 44 | char *pszPrev = pszCur;
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| 45 | if ((uintptr_t)pszPrev > (uintptr_t)pszTop)
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| 46 | {
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| 47 | pszPrev--;
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| 48 | while ( (uintptr_t)pszPrev > (uintptr_t)pszTop
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| 49 | && pszPrev[-1] != RTPATH_SLASH)
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| 50 | pszPrev--;
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| 51 | }
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| 52 | if (!pszCur[2])
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| 53 | {
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| 54 | if (pszPrev != pszTop)
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| 55 | pszPrev[-1] = '\0';
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| 56 | else
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| 57 | *pszPrev = '\0';
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| 58 | break;
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| 59 | }
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| 60 | Assert(pszPrev[-1] == RTPATH_SLASH);
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| 61 | memmove(pszPrev, pszCur + 3, strlen(pszCur + 3) + 1);
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| 62 | pszCur = pszPrev - 1;
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| 63 | }
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| 64 | else if ( chFirst == '.'
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| 65 | && (!pszCur[1] || pszCur[1] == RTPATH_SLASH))
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| 66 | {
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| 67 | /* remove unnecessary '.' */
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| 68 | if (!pszCur[1])
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| 69 | {
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| 70 | if (pszCur != pszTop)
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| 71 | pszCur[-1] = '\0';
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| 72 | else
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| 73 | *pszCur = '\0';
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| 74 | break;
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| 75 | }
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| 76 | memmove(pszCur, pszCur + 2, strlen(pszCur + 2) + 1);
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| 77 | continue;
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| 78 | }
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| 79 | else
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| 80 | {
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| 81 | /* advance to end of component. */
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| 82 | while (*pszCur && *pszCur != RTPATH_SLASH)
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| 83 | pszCur++;
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| 84 | }
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| 85 |
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| 86 | if (!*pszCur)
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| 87 | break;
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| 88 |
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| 89 | /* skip the slash */
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| 90 | ++pszCur;
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| 91 | }
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| 92 | }
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| 93 | #endif /* RT_OS_WINDOWS */
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| 94 |
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| 95 | int vbsfPathAbs(const char *pszRoot, const char *pszPath, char *pszAbsPath, size_t cbAbsPath)
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| 96 | {
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| 97 | #if defined(RT_OS_WINDOWS)
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| 98 | const char *pszPathStart = pszRoot? pszRoot: pszPath;
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| 99 |
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| 100 | /* Windows extended-length paths. */
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| 101 | if ( RTPATH_IS_SLASH(pszPathStart[0])
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| 102 | && RTPATH_IS_SLASH(pszPathStart[1])
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| 103 | && pszPathStart[2] == '?'
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| 104 | && RTPATH_IS_SLASH(pszPathStart[3])
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| 105 | )
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| 106 | {
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| 107 | /* Maximum total path length of 32,767 characters. */
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| 108 | if (cbAbsPath > _32K)
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| 109 | cbAbsPath = _32K;
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| 110 |
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| 111 | /* Copy the root to pszAbsPath buffer. */
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| 112 | size_t cchRoot = pszRoot? strlen(pszRoot): 0;
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| 113 | if (cchRoot >= cbAbsPath)
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| 114 | return VERR_FILENAME_TOO_LONG;
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| 115 |
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| 116 | if (pszRoot)
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| 117 | {
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| 118 | /* Caller must ensure that the path is relative, without the leading path separator. */
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| 119 | if (RTPATH_IS_SLASH(pszPath[0]))
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| 120 | return VERR_INVALID_PARAMETER;
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| 121 |
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| 122 | if (cchRoot)
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| 123 | memcpy(pszAbsPath, pszRoot, cchRoot);
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| 124 |
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| 125 | if (cchRoot == 0 || !RTPATH_IS_SLASH(pszAbsPath[cchRoot - 1]))
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| 126 | {
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| 127 | /* Append path separator after the root. */
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| 128 | ++cchRoot;
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| 129 | if (cchRoot >= cbAbsPath)
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| 130 | return VERR_FILENAME_TOO_LONG;
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| 131 |
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| 132 | pszAbsPath[cchRoot - 1] = RTPATH_SLASH;
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| 133 | }
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| 134 | }
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| 135 |
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| 136 | /* Append the path to the pszAbsPath buffer. */
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| 137 | const size_t cchPath = strlen(pszPath);
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| 138 | if (cchRoot + cchPath >= cbAbsPath)
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| 139 | return VERR_FILENAME_TOO_LONG;
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| 140 |
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| 141 | memcpy(&pszAbsPath[cchRoot], pszPath, cchPath + 1); /* Including trailing 0. */
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| 142 |
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| 143 | /* Find out where the actual path begins, i.e. skip the root spec. */
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| 144 | char *pszPathBegin = &pszAbsPath[4]; /* Skip the extended-length path prefix "\\?\" */
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| 145 | if ( pszPathBegin[0]
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| 146 | && RTPATH_IS_VOLSEP(pszPathBegin[1])
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| 147 | && pszPathBegin[2] == RTPATH_SLASH)
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| 148 | {
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| 149 | /* "\\?\C:\" */
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| 150 | pszPathBegin += 3;
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| 151 | }
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| 152 | else if ( pszPathBegin[0] == 'U'
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| 153 | && pszPathBegin[1] == 'N'
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| 154 | && pszPathBegin[2] == 'C'
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| 155 | && pszPathBegin[3] == RTPATH_SLASH)
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| 156 | {
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| 157 | /* "\\?\UNC\server\share" */
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| 158 | pszPathBegin += 4;
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| 159 |
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| 160 | /* Skip "server\share" too. */
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| 161 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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| 162 | ++pszPathBegin;
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| 163 | if (*pszPathBegin == RTPATH_SLASH)
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| 164 | {
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| 165 | ++pszPathBegin;
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| 166 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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| 167 | ++pszPathBegin;
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| 168 | if (*pszPathBegin == RTPATH_SLASH)
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| 169 | ++pszPathBegin;
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| 170 | }
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| 171 | }
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| 172 | else
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| 173 | return VERR_INVALID_NAME;
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| 174 |
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| 175 | /* Process pszAbsPath in place. */
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| 176 | vbsfPathResolveRelative(pszPathBegin);
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| 177 |
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| 178 | return VINF_SUCCESS;
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| 179 | }
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| 180 | #endif /* RT_OS_WINDOWS */
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| 181 |
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| 182 | /* Fallback for the common paths. */
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| 183 | return RTPathAbsEx(pszRoot, pszPath, pszAbsPath, cbAbsPath);
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| 184 | }
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