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annotate liboctave/system/lo-sysdep.cc @ 26531:481ac37b0e0e stable

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lo-sysdep.cc: Fix static analyzer detected issue (bug #55464). * lo-sysdep.cc (putenv_wrapper): Fix use after free.
author Markus Mützel <markus.muetzel@gmx.de>
date Sun, 13 Jan 2019 14:31:16 +0100
parents 9cf999911dfe
children 84ff9953faa1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 1996-2019 John W. Eaton
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4
66ef74ee5d9f [project @ 1997-05-05 03:20:52 by jwe]
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5 This file is part of Octave.
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6
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7 Octave is free software: you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation, either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <https://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (HAVE_CONFIG_H)
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24 # include "config.h"
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25 #endif
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27 #include <string>
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29 #include "dir-ops.h"
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30 #include "file-ops.h"
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31 #include "lo-error.h"
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32 #include "lo-sysdep.h"
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33 #include "putenv-wrapper.h"
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34 #include "uniconv-wrappers.h"
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35 #include "unistd-wrappers.h"
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36 #include "unsetenv-wrapper.h"
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38 #if defined (OCTAVE_USE_WINDOWS_API)
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39 # include <windows.h>
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40 # include <wchar.h>
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41
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42 # include "lo-hash.h"
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43 # include "unwind-prot.h"
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44 #endif
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45
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46 namespace octave
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47 {
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48 namespace sys
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49 {
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50 std::string
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51 getcwd (void)
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52 {
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53 std::string retval;
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54
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55 // Using octave_getcwd_wrapper ensures that we have a getcwd that
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56 // will allocate a buffer as large as necessary if buf and size are
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57 // both 0.
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58
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59 char *tmp = octave_getcwd_wrapper (nullptr, 0);
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60
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61 if (! tmp)
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62 (*current_liboctave_error_handler) ("unable to find current directory");
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63
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64 retval = tmp;
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65 free (tmp);
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66
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67 return retval;
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68 }
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70 int
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71 chdir (const std::string& path_arg)
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72 {
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73 std::string path = sys::file_ops::tilde_expand (path_arg);
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74
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75 #if defined (OCTAVE_USE_WINDOWS_API)
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76 if (path.length () == 2 && path[1] == ':')
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77 path += '\\';
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78 #endif
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79
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80 return octave_chdir_wrapper (path.c_str ());
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81 }
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82
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83 bool
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84 get_dirlist (const std::string& dirname, string_vector& dirlist, std::string& msg)
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85 {
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86 dirlist = "";
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87 msg = "";
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88 #if defined (OCTAVE_USE_WINDOWS_API)
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89 _WIN32_FIND_DATAW ffd;
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90
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91 std::string path_name (dirname);
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92 if (path_name.empty ())
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93 return true;
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94
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95 if (path_name.back () == '\\' || path_name.back () == '/')
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96 path_name.push_back ('*');
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97 else
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98 path_name.append (R"(\*)");
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99
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100 // Find first file in directory.
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101 HANDLE hFind = FindFirstFileW (u8_to_wstring (path_name).c_str (),
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102 &ffd);
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103 if (INVALID_HANDLE_VALUE == hFind)
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104 {
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105 DWORD errCode = GetLastError ();
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106 char *errorText = nullptr;
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107 FormatMessageA (FORMAT_MESSAGE_FROM_SYSTEM |
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108 FORMAT_MESSAGE_ALLOCATE_BUFFER |
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109 FORMAT_MESSAGE_IGNORE_INSERTS,
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110 nullptr, errCode,
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111 MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
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112 reinterpret_cast <char *> (&errorText), 0, nullptr);
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113 if (errorText != nullptr)
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114 {
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115 msg = std::string (errorText);
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116 LocalFree (errorText);
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117 }
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118 return false;
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119 }
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120
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121 std::list<std::string> dirlist_str;
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122 do
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123 dirlist_str.push_back (u8_from_wstring (ffd.cFileName));
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124 while (FindNextFileW (hFind, &ffd) != 0);
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125
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126 FindClose(hFind);
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127
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128 dirlist = string_vector (dirlist_str);
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129
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130 #else
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131
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132 dir_entry dir (dirname);
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133
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134 if (! dir)
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135 {
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136 msg = dir.error ();
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137 return false;
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138 }
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139
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140 dirlist = dir.read ();
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141
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142 dir.close ();
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143 #endif
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144
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145 return true;
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146 }
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147
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148 std::FILE *
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149 fopen (const std::string& filename, const std::string& mode)
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150 {
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151 #if defined (OCTAVE_USE_WINDOWS_API)
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152 return _wfopen (u8_to_wstring (filename).c_str (),
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153 u8_to_wstring (mode).c_str ());
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154 #else
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155 return std::fopen (filename.c_str (), mode.c_str ());
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156 #endif
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157 }
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158
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159 void
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160 putenv_wrapper (const std::string& name, const std::string& value)
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161 {
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162 // This function was adapted from xputenv from Karl Berry's kpathsearch
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163 // library.
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164 // FIXME: make this do the right thing if we don't have a SMART_PUTENV.
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165
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166 int new_len = name.length () + value.length () + 2;
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167
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168 // FIXME: This leaks memory, but so would a call to setenv.
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169 // Short of extreme measures to track memory, altering the environment
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170 // always leaks memory, but the saving grace is that the leaks are small.
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171
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172 char *new_item = static_cast<char *> (std::malloc (new_len));
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173
26506
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174 if (new_item)
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175 sprintf (new_item, "%s=%s", name.c_str (), value.c_str ());
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176
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177 // As far as I can see there's no way to distinguish between the
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178 // various errors; putenv doesn't have errno values.
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179
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180 #if defined (OCTAVE_USE_WINDOWS_API)
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181 wchar_t *wnew_item = u8_to_wchar (new_item);
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182 octave::unwind_protect frame;
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183 frame.add_fcn (std::free, static_cast<void *> (new_item));
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184 if (_wputenv (wnew_item) < 0)
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185 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item);
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186 #else
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187 if (octave_putenv_wrapper (new_item) < 0)
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188 (*current_liboctave_error_handler) ("putenv (%s) failed", new_item);
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189 #endif
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190 }
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191
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192 std::string
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193 getenv_wrapper (const std::string& name)
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194 {
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195 #if defined (OCTAVE_USE_WINDOWS_API)
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196 wchar_t *env = _wgetenv (u8_to_wstring (name).c_str ());
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197 return env ? u8_from_wstring (env) : "";
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198 #else
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199 char *env = ::getenv (name.c_str ());
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200 return env ? env : "";
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201 #endif
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202 }
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203
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diff changeset
204 int
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205 unsetenv_wrapper (const std::string& name)
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206 {
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diff changeset
207 #if defined (OCTAVE_USE_WINDOWS_API)
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208 putenv_wrapper (name, "");
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209
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210 std::wstring wname = u8_to_wstring (name);
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211 return (SetEnvironmentVariableW (wname.c_str (), nullptr) ? 0 : -1);
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212 #else
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213 return octave_unsetenv_wrapper (name.c_str ());
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diff changeset
214 #endif
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215 }
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216
25514
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217 std::wstring
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218 u8_to_wstring (const std::string& utf8_string)
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219 {
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220 size_t srclen = utf8_string.length ();
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221 const uint8_t *src = reinterpret_cast<const uint8_t *>
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222 (utf8_string.c_str ());
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223
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diff changeset
224 size_t length = 0;
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225 wchar_t *wchar = reinterpret_cast<wchar_t *>
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226 (octave_u8_conv_to_encoding ("wchar_t", src, srclen,
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diff changeset
227 &length));
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228
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diff changeset
229 std::wstring retval = L"";
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diff changeset
230 if (wchar != nullptr)
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diff changeset
231 {
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232 retval = std::wstring (wchar, length / sizeof (wchar_t));
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diff changeset
233 free (static_cast<void *> (wchar));
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234 }
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diff changeset
235
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diff changeset
236 return retval;
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237 }
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diff changeset
238
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diff changeset
239 std::string
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diff changeset
240 u8_from_wstring (const std::wstring& wchar_string)
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diff changeset
241 {
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242 size_t srclen = wchar_string.length () * sizeof (wchar_t);
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243 const char *src = reinterpret_cast<const char *> (wchar_string.c_str ());
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244
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245 size_t length = 0;
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246 char *mbchar = reinterpret_cast<char *>
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247 (octave_u8_conv_from_encoding ("wchar_t", src, srclen,
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248 &length));
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249
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250 std::string retval = "";
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251 if (mbchar != nullptr)
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252 {
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253 retval = std::string (mbchar, length);
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254 free (static_cast<void *> (mbchar));
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255 }
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256
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257 return retval;
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258 }
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259
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260 // At quite a few places in the code we are passing file names as
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261 // char arrays to external library functions.
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262
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263 // When these functions try to locate the corresponding file on the
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264 // disc, they need to use the wide character API on Windows to
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265 // correctly open files with non-ASCII characters.
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266
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267 // But they have no way of knowing which encoding we are using for
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268 // the passed string. So they have no way of reliably converting to
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269 // a wchar_t array. (I.e. there is no possible fix for these
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270 // functions with current C or C++.)
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271
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272 // To solve the dilemma, the function "get_ASCII_filename" first
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273 // checks whether there are any non-ASCII characters in the passed
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274 // file name. If there are not, it returns the original name.
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275
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276 // Otherwise, it tries to obtain the short file name (8.3 naming
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277 // scheme) which only consists of ASCII characters and are safe to
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278 // pass. However, short file names can be disabled for performance
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279 // reasons on the file system level with NTFS. So there is no
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280 // guarantee that these exist.
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281
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282 // If short file names are not stored, a hard link to the file is
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283 // created. For this the path to the file is split at the deepest
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284 // possible level that doesn't contain non-ASCII characters. At
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285 // that level a hidden folder is created that holds the hard links.
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286 // That means we need to have write access on that location. A path
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287 // to that hard link is returned.
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288
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289 // If the file system is FAT32, there are no hard links. But FAT32
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290 // always stores short file names. So we are safe.
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291
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292 // ExFAT that is occasionally used on USB sticks and SD cards stores
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293 // neither short file names nor does it support hard links. So for
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294 // exFAT with this function, there is (currently) no way to generate
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295 // a file name that is stripped from non-ASCII characters but still
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296 // is valid.
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297
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298 // For Unixy systems, this function does nothing.
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299
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300 std::string
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301 get_ASCII_filename (const std::string& orig_file_name)
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302 {
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303 #if defined (OCTAVE_USE_WINDOWS_API)
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304
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305 // Return file name that only contains ASCII characters that can
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306 // be used to access the file orig_file_name. The original file
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307 // must exist in the file system before calling this function.
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308 // This is useful for passing file names to functions that are not
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309 // aware of the character encoding we are using.
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310
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311 // 1. Check whether filename contains non-ASCII (UTF-8) characters.
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312
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313 std::string::const_iterator first_non_ASCII
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314 = std::find_if (orig_file_name.begin (), orig_file_name.end (),
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315 [](char c) { return (c < 0 || c >= 128); });
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316
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317 if (first_non_ASCII == orig_file_name.end ())
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318 return orig_file_name;
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319
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320 // 2. Check if file system stores short filenames (always
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321 // ASCII-only).
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322
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323 std::wstring w_orig_file_name_str = u8_to_wstring (orig_file_name);
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324 const wchar_t *w_orig_file_name = w_orig_file_name_str.c_str ();
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325
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326 // Get full path to file
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327 wchar_t w_full_file_name[_MAX_PATH];
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328 if (_wfullpath (w_full_file_name, w_orig_file_name, _MAX_PATH) == nullptr)
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329 return orig_file_name;
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330
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331 std::wstring w_full_file_name_str = w_full_file_name;
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332
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333 // Get short filename (8.3) from UTF-16 filename.
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334
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335 long length = GetShortPathNameW (w_full_file_name, nullptr, 0);
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336
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337 if (length > 0)
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338 {
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339 // Dynamically allocate the correct size (terminating null char
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340 // was included in length).
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341
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342 wchar_t *w_short_file_name = new wchar_t[length];
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343 GetShortPathNameW (w_full_file_name, w_short_file_name, length);
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344
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345 std::wstring w_short_file_name_str
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346 = std::wstring (w_short_file_name, length);
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347 std::string short_file_name = u8_from_wstring (w_short_file_name_str);
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348
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349 if (w_short_file_name_str.compare (0, length-1, w_full_file_name_str) != 0)
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350 return short_file_name;
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351 }
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352
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353 // 3. Create hard link with only-ASCII characters.
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354 // Get longest possible part of path that only contains ASCII chars.
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355
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356 std::wstring::iterator w_first_non_ASCII
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357 = std::find_if (w_full_file_name_str.begin (), w_full_file_name_str.end (),
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358 [](wchar_t c) { return (c < 0 || c >= 128); });
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359 std::wstring tmp_substr
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360 = std::wstring (w_full_file_name_str.begin (), w_first_non_ASCII);
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361
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362 size_t pos
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363 = tmp_substr.find_last_of (u8_to_wstring (file_ops::dir_sep_chars ()));
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364
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365 std::string par_dir
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366 = u8_from_wstring (w_full_file_name_str.substr (0, pos+1));
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367
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368 // Create .oct_ascii directory.
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369 // FIXME: We need to have write permission in this location.
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370
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371 std::string oct_ascii_dir = par_dir + ".oct_ascii";
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372 std::string test_dir = canonicalize_file_name (oct_ascii_dir);
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373
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374 if (test_dir.empty ())
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375 {
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376 std::string msg;
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377 int status = octave::sys::mkdir (oct_ascii_dir, 0777, msg);
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378
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379 if (status < 0)
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380 return orig_file_name;
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381
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382 // Set hidden property.
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383 SetFileAttributesA (oct_ascii_dir.c_str (), FILE_ATTRIBUTE_HIDDEN);
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384 }
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385
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386 // Create file from hash of full filename.
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387 std::string filename_hash
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388 = (oct_ascii_dir + file_ops::dir_sep_str ()
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389 + octave::crypto::hash ("SHA1", orig_file_name));
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390
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391 std::string abs_filename_hash = canonicalize_file_name (filename_hash);
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392
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393 if (! abs_filename_hash.empty ())
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394 octave::sys::unlink (filename_hash);
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395
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396 wchar_t w_filename_hash[filename_hash.length ()+1] = {0};
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397
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398 for (size_t i=0; i < filename_hash.length (); i++)
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399 w_filename_hash[i] = filename_hash.at (i);
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400
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401 if (CreateHardLinkW (w_filename_hash, w_orig_file_name, nullptr))
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402 return filename_hash;
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403
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404 #endif
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405
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406 return orig_file_name;
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407 }
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408 }
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409 }