1 | /* $Id: vbsfpathabs.cpp 66090 2017-03-14 14:02:22Z vboxsync $ */
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2 | /** @file
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3 | * Shared Folders - 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 | #include <iprt/path.h>
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19 | #include <iprt/string.h>
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20 |
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21 | #if defined(RT_OS_WINDOWS)
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22 | static void vbsfPathResolveRelative(char *pszPathBegin)
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23 | {
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24 | char *pszCur = pszPathBegin;
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25 | char * const pszTop = pszCur;
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26 |
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27 | /*
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28 | * Get rid of double dot path components by evaluating them.
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29 | */
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30 | for (;;)
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31 | {
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32 | char const chFirst = pszCur[0];
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33 | if ( chFirst == '.'
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34 | && pszCur[1] == '.'
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35 | && (!pszCur[2] || pszCur[2] == RTPATH_SLASH))
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36 | {
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37 | /* rewind to the previous component if any */
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38 | char *pszPrev = pszCur;
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39 | if ((uintptr_t)pszPrev > (uintptr_t)pszTop)
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40 | {
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41 | pszPrev--;
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42 | while ( (uintptr_t)pszPrev > (uintptr_t)pszTop
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43 | && pszPrev[-1] != RTPATH_SLASH)
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44 | pszPrev--;
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45 | }
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46 | if (!pszCur[2])
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47 | {
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48 | if (pszPrev != pszTop)
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49 | pszPrev[-1] = '\0';
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50 | else
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51 | *pszPrev = '\0';
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52 | break;
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53 | }
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54 | Assert(pszPrev[-1] == RTPATH_SLASH);
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55 | memmove(pszPrev, pszCur + 3, strlen(pszCur + 3) + 1);
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56 | pszCur = pszPrev - 1;
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57 | }
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58 | else if ( chFirst == '.'
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59 | && (!pszCur[1] || pszCur[1] == RTPATH_SLASH))
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60 | {
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61 | /* remove unnecessary '.' */
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62 | if (!pszCur[1])
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63 | {
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64 | if (pszCur != pszTop)
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65 | pszCur[-1] = '\0';
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66 | else
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67 | *pszCur = '\0';
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68 | break;
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69 | }
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70 | memmove(pszCur, pszCur + 2, strlen(pszCur + 2) + 1);
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71 | continue;
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72 | }
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73 | else
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74 | {
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75 | /* advance to end of component. */
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76 | while (*pszCur && *pszCur != RTPATH_SLASH)
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77 | pszCur++;
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78 | }
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79 |
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80 | if (!*pszCur)
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81 | break;
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82 |
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83 | /* skip the slash */
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84 | ++pszCur;
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85 | }
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86 | }
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87 | #endif /* RT_OS_WINDOWS */
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88 |
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89 | int vbsfPathAbs(const char *pszRoot, const char *pszPath, char *pszAbsPath, size_t cbAbsPath)
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90 | {
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91 | #if defined(RT_OS_WINDOWS)
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92 | const char *pszPathStart = pszRoot? pszRoot: pszPath;
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93 |
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94 | /* Windows extended-length paths. */
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95 | if ( RTPATH_IS_SLASH(pszPathStart[0])
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96 | && RTPATH_IS_SLASH(pszPathStart[1])
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97 | && pszPathStart[2] == '?'
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98 | && RTPATH_IS_SLASH(pszPathStart[3])
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99 | )
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100 | {
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101 | /* Maximum total path length of 32,767 characters. */
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102 | if (cbAbsPath > _32K)
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103 | cbAbsPath = _32K;
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104 |
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105 | /* Copy the root to pszAbsPath buffer. */
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106 | size_t cchRoot = pszRoot? strlen(pszRoot): 0;
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107 | if (cchRoot >= cbAbsPath)
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108 | return VERR_FILENAME_TOO_LONG;
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109 |
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110 | if (pszRoot)
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111 | {
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112 | /* Caller must ensure that the path is relative, without the leading path separator. */
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113 | if (RTPATH_IS_SLASH(pszPath[0]))
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114 | return VERR_INVALID_PARAMETER;
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115 |
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116 | if (cchRoot)
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117 | memcpy(pszAbsPath, pszRoot, cchRoot);
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118 |
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119 | if (cchRoot == 0 || !RTPATH_IS_SLASH(pszAbsPath[cchRoot - 1]))
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120 | {
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121 | /* Append path separator after the root. */
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122 | ++cchRoot;
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123 | if (cchRoot >= cbAbsPath)
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124 | return VERR_FILENAME_TOO_LONG;
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125 |
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126 | pszAbsPath[cchRoot - 1] = RTPATH_SLASH;
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127 | }
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128 | }
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129 |
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130 | /* Append the path to the pszAbsPath buffer. */
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131 | const size_t cchPath = strlen(pszPath);
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132 | if (cchRoot + cchPath >= cbAbsPath)
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133 | return VERR_FILENAME_TOO_LONG;
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134 |
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135 | memcpy(&pszAbsPath[cchRoot], pszPath, cchPath + 1); /* Including trailing 0. */
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136 |
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137 | /* Find out where the actual path begins, i.e. skip the root spec. */
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138 | char *pszPathBegin = &pszAbsPath[4]; /* Skip the extended-length path prefix "\\?\" */
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139 | if ( pszPathBegin[0]
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140 | && RTPATH_IS_VOLSEP(pszPathBegin[1])
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141 | && pszPathBegin[2] == RTPATH_SLASH)
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142 | {
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143 | /* "\\?\C:\" */
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144 | pszPathBegin += 3;
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145 | }
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146 | else if ( pszPathBegin[0] == 'U'
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147 | && pszPathBegin[1] == 'N'
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148 | && pszPathBegin[2] == 'C'
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149 | && pszPathBegin[3] == RTPATH_SLASH)
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150 | {
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151 | /* "\\?\UNC\server\share" */
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152 | pszPathBegin += 4;
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153 |
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154 | /* Skip "server\share" too. */
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155 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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156 | ++pszPathBegin;
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157 | if (*pszPathBegin == RTPATH_SLASH)
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158 | {
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159 | ++pszPathBegin;
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160 | while (*pszPathBegin != RTPATH_SLASH && *pszPathBegin)
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161 | ++pszPathBegin;
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162 | if (*pszPathBegin == RTPATH_SLASH)
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163 | ++pszPathBegin;
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164 | }
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165 | }
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166 | else
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167 | return VERR_INVALID_NAME;
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168 |
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169 | /* Process pszAbsPath in place. */
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170 | vbsfPathResolveRelative(pszPathBegin);
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171 |
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172 | return VINF_SUCCESS;
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173 | }
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174 | #endif /* RT_OS_WINDOWS */
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175 |
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176 | /* Fallback for the common paths. */
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177 | return RTPathAbsEx(pszRoot, pszPath, pszAbsPath, cbAbsPath);
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178 | }
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