[66090] | 1 | /* $Id: vbsfpathabs.cpp 99775 2023-05-12 12:21:58Z vboxsync $ */
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| 2 | /** @file
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[75498] | 3 | * Shared Folders Service - guest/host path convertion and verification.
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[66090] | 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2017-2023 Oracle and/or its affiliates.
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[66090] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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[66090] | 26 | */
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| 27 |
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[75506] | 28 |
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[75498] | 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_SHARED_FOLDERS
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[76365] | 33 | #include <iprt/err.h>
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[66090] | 34 | #include <iprt/path.h>
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| 35 | #include <iprt/string.h>
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| 36 |
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[99775] | 37 | #include "vbsfpath.h"
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[75498] | 38 |
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[66090] | 39 | #if defined(RT_OS_WINDOWS)
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| 40 | static void vbsfPathResolveRelative(char *pszPathBegin)
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| 41 | {
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| 42 | char *pszCur = pszPathBegin;
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| 43 | char * const pszTop = pszCur;
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| 44 |
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| 45 | /*
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| 46 | * Get rid of double dot path components by evaluating them.
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| 47 | */
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| 48 | for (;;)
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| 49 | {
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| 50 | char const chFirst = pszCur[0];
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| 51 | if ( chFirst == '.'
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| 52 | && pszCur[1] == '.'
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| 53 | && (!pszCur[2] || pszCur[2] == RTPATH_SLASH))
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| 54 | {
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| 55 | /* rewind to the previous component if any */
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| 56 | char *pszPrev = pszCur;
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| 57 | if ((uintptr_t)pszPrev > (uintptr_t)pszTop)
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| 58 | {
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| 59 | pszPrev--;
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| 60 | while ( (uintptr_t)pszPrev > (uintptr_t)pszTop
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| 61 | && pszPrev[-1] != RTPATH_SLASH)
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| 62 | pszPrev--;
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| 63 | }
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| 64 | if (!pszCur[2])
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| 65 | {
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| 66 | if (pszPrev != pszTop)
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| 67 | pszPrev[-1] = '\0';
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| 68 | else
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| 69 | *pszPrev = '\0';
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| 70 | break;
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| 71 | }
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| 72 | Assert(pszPrev[-1] == RTPATH_SLASH);
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| 73 | memmove(pszPrev, pszCur + 3, strlen(pszCur + 3) + 1);
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| 74 | pszCur = pszPrev - 1;
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| 75 | }
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| 76 | else if ( chFirst == '.'
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| 77 | && (!pszCur[1] || pszCur[1] == RTPATH_SLASH))
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| 78 | {
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| 79 | /* remove unnecessary '.' */
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| 80 | if (!pszCur[1])
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| 81 | {
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| 82 | if (pszCur != pszTop)
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| 83 | pszCur[-1] = '\0';
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| 84 | else
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| 85 | *pszCur = '\0';
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| 86 | break;
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| 87 | }
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| 88 | memmove(pszCur, pszCur + 2, strlen(pszCur + 2) + 1);
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| 89 | continue;
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| 90 | }
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| 91 | else
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| 92 | {
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| 93 | /* advance to end of component. */
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| 94 | while (*pszCur && *pszCur != RTPATH_SLASH)
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| 95 | pszCur++;
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| 96 | }
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| 97 |
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| 98 | if (!*pszCur)
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| 99 | break;
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| 100 |
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| 101 | /* skip the slash */
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| 102 | ++pszCur;
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| 103 | }
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| 104 | }
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| 105 | #endif /* RT_OS_WINDOWS */
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| 106 |
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| 107 | int vbsfPathAbs(const char *pszRoot, const char *pszPath, char *pszAbsPath, size_t cbAbsPath)
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| 108 | {
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| 109 | #if defined(RT_OS_WINDOWS)
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[78090] | 110 | /** @todo This code is not needed in 6.0 and later as IPRT translates paths
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[81369] | 111 | * to //./ (inverted slashes for doxygen) format if they're too long. */
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[66090] | 112 | const char *pszPathStart = pszRoot? pszRoot: pszPath;
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| 113 |
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| 114 | /* Windows extended-length paths. */
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| 115 | if ( RTPATH_IS_SLASH(pszPathStart[0])
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| 116 | && RTPATH_IS_SLASH(pszPathStart[1])
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| 117 | && pszPathStart[2] == '?'
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| 118 | && RTPATH_IS_SLASH(pszPathStart[3])
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| 119 | )
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| 120 | {
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| 121 | /* Maximum total path length of 32,767 characters. */
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| 122 | if (cbAbsPath > _32K)
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| 123 | cbAbsPath = _32K;
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| 124 |
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| 125 | /* Copy the root to pszAbsPath buffer. */
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| 126 | size_t cchRoot = pszRoot? strlen(pszRoot): 0;
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| 127 | if (cchRoot >= cbAbsPath)
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| 128 | return VERR_FILENAME_TOO_LONG;
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| 129 |
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| 130 | if (pszRoot)
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| 131 | {
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| 132 | /* Caller must ensure that the path is relative, without the leading path separator. */
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| 133 | if (RTPATH_IS_SLASH(pszPath[0]))
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| 134 | return VERR_INVALID_PARAMETER;
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| 135 |
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| 136 | if (cchRoot)
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| 137 | memcpy(pszAbsPath, pszRoot, cchRoot);
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| 138 |
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| 139 | if (cchRoot == 0 || !RTPATH_IS_SLASH(pszAbsPath[cchRoot - 1]))
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| 140 | {
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| 141 | /* Append path separator after the root. */
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| 142 | ++cchRoot;
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| 143 | if (cchRoot >= cbAbsPath)
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| 144 | return VERR_FILENAME_TOO_LONG;
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| 145 |
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| 146 | pszAbsPath[cchRoot - 1] = RTPATH_SLASH;
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| 147 | }
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| 148 | }
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| 149 |
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| 150 | /* Append the path to the pszAbsPath buffer. */
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| 151 | const size_t cchPath = strlen(pszPath);
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| 152 | if (cchRoot + cchPath >= cbAbsPath)
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| 153 | return VERR_FILENAME_TOO_LONG;
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| 154 |
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| 155 | memcpy(&pszAbsPath[cchRoot], pszPath, cchPath + 1); /* Including trailing 0. */
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| 156 |
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| 157 | /* Find out where the actual path begins, i.e. skip the root spec. */
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| 158 | char *pszPathBegin = &pszAbsPath[4]; /* Skip the extended-length path prefix "\\?\" */
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| 159 | if ( pszPathBegin[0]
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| 160 | && RTPATH_IS_VOLSEP(pszPathBegin[1])
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| 161 | && pszPathBegin[2] == RTPATH_SLASH)
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| 162 | {
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| 163 | /* "\\?\C:\" */
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| 164 | pszPathBegin += 3;
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| 165 | }
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| 166 | else if ( pszPathBegin[0] == 'U'
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| 167 | && pszPathBegin[1] == 'N'
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| 168 | && pszPathBegin[2] == 'C'
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| 169 | && pszPathBegin[3] == RTPATH_SLASH)
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| 170 | {
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| 171 | /* "\\?\UNC\server\share" */
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| 172 | pszPathBegin += 4;
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| 173 |
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| 174 | /* Skip "server\share" too. */
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| 175 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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| 176 | ++pszPathBegin;
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| 177 | if (*pszPathBegin == RTPATH_SLASH)
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| 178 | {
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| 179 | ++pszPathBegin;
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| 180 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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| 181 | ++pszPathBegin;
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| 182 | if (*pszPathBegin == RTPATH_SLASH)
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| 183 | ++pszPathBegin;
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| 184 | }
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| 185 | }
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| 186 | else
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| 187 | return VERR_INVALID_NAME;
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| 188 |
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| 189 | /* Process pszAbsPath in place. */
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| 190 | vbsfPathResolveRelative(pszPathBegin);
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| 191 |
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| 192 | return VINF_SUCCESS;
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| 193 | }
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| 194 | #endif /* RT_OS_WINDOWS */
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| 195 |
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| 196 | /* Fallback for the common paths. */
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[78090] | 197 |
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[78114] | 198 | if (*pszPath != '\0')
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| 199 | return RTPathAbsEx(pszRoot, pszPath, RTPATH_STR_F_STYLE_HOST, pszAbsPath, &cbAbsPath);
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| 200 | return RTPathAbsEx(NULL, pszRoot, RTPATH_STR_F_STYLE_HOST, pszAbsPath, &cbAbsPath);
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[66090] | 201 | }
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