common/homedir.c

   1 /* homedir.c - Setup the home directory.
   2  *      Copyright (C) 2004, 2006, 2007 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24
  25 #ifdef HAVE_W32_SYSTEM
  26 #include <shlobj.h>
  27 #ifndef CSIDL_APPDATA
  28 #define CSIDL_APPDATA 0x001a
  29 #endif
  30 #ifndef CSIDL_LOCAL_APPDATA
  31 #define CSIDL_LOCAL_APPDATA 0x001c
  32 #endif
  33 #ifndef CSIDL_FLAG_CREATE
  34 #define CSIDL_FLAG_CREATE 0x8000
  35 #endif
  36 #endif /*HAVE_W32_SYSTEM*/
  37
  38
  39
  40 #include "util.h"
  41 #include "sysutils.h"
  42
  43
  44 /* This is a helper function to load a Windows function from either of
  45    one DLLs. */
  46 #ifdef HAVE_W32_SYSTEM
  47 static HRESULT
  48 w32_shgetfolderpath (HWND a, int b, HANDLE c, DWORD d, LPSTR e)
  49 {
  50   static int initialized;
  51   static HRESULT (WINAPI * func)(HWND,int,HANDLE,DWORD,LPSTR);
  52
  53   if (!initialized)
  54     {
  55       static char *dllnames[] = { "shell32.dll", "shfolder.dll", NULL };
  56       void *handle;
  57       int i;
  58
  59       initialized = 1;
  60
  61       for (i=0, handle = NULL; !handle && dllnames[i]; i++)
  62         {
  63           handle = dlopen (dllnames[i], RTLD_LAZY);
  64           if (handle)
  65             {
  66               func = dlsym (handle, "SHGetFolderPathA");
  67               if (!func)
  68                 {
  69                   dlclose (handle);
  70                   handle = NULL;
  71                 }
  72             }
  73         }
  74     }
  75
  76   if (func)
  77     return func (a,b,c,d,e);
  78   else
  79     return -1;
  80 }
  81 #endif /*HAVE_W32_SYSTEM*/
  82
  83
  84 /* Get the standard home directory.  In general this function should
  85    not be used as it does not consider a registry value (under W32) or
  86    the GNUPGHOME encironment variable.  It is better to use
  87    default_homedir(). */
  88 const char *
  89 standard_homedir (void)
  90 {
  91 #ifdef HAVE_W32_SYSTEM
  92   static const char *dir;
  93
  94   if (!dir)
  95     {
  96       char path[MAX_PATH];
  97
  98       /* It might be better to use LOCAL_APPDATA because this is
  99          defined as "non roaming" and thus more likely to be kept
 100          locally.  For private keys this is desired.  However, given
 101          that many users copy private keys anyway forth and back,
 102          using a system roaming services might be better than to let
 103          them do it manually.  A security conscious user will anyway
 104          use the registry entry to have better control.  */
 105       if (w32_shgetfolderpath (NULL, CSIDL_APPDATA|CSIDL_FLAG_CREATE,
 106                                NULL, 0, path) >= 0)
 107         {
 108           char *tmp = xmalloc (strlen (path) + 6 +1);
 109           strcpy (stpcpy (tmp, path), "\\gnupg");
 110           dir = tmp;
 111
 112           /* Try to create the directory if it does not yet exists.  */
 113           if (access (dir, F_OK))
 114             CreateDirectory (dir, NULL);
 115         }
 116       else
 117         dir = GNUPG_DEFAULT_HOMEDIR;
 118     }
 119   return dir;
 120 #else/*!HAVE_W32_SYSTEM*/
 121   return GNUPG_DEFAULT_HOMEDIR;
 122 #endif /*!HAVE_W32_SYSTEM*/
 123 }
 124
 125 /* Set up the default home directory.  The usual --homedir option
 126    should be parsed later. */
 127 const char *
 128 default_homedir (void)
 129 {
 130   const char *dir;
 131
 132   dir = getenv ("GNUPGHOME");
 133 #ifdef HAVE_W32_SYSTEM
 134   if (!dir || !*dir)
 135     {
 136       static const char *saved_dir;
 137
 138       if (!saved_dir)
 139         {
 140           if (!dir || !*dir)
 141             {
 142               char *tmp;
 143
 144               tmp = read_w32_registry_string (NULL, "Software\\GNU\\GnuPG",
 145                                               "HomeDir");
 146               if (tmp && *tmp)
 147                 {
 148                   xfree (tmp);
 149                   tmp = NULL;
 150                 }
 151               if (tmp)
 152                 saved_dir = tmp;
 153             }
 154
 155           if (!saved_dir)
 156             saved_dir = standard_homedir ();
 157         }
 158       dir = saved_dir;
 159     }
 160 #endif /*HAVE_W32_SYSTEM*/
 161   if (!dir || !*dir)
 162     dir = GNUPG_DEFAULT_HOMEDIR;
 163
 164   return dir;
 165 }
 166
 167
 168 #ifdef HAVE_W32_SYSTEM
 169 static const char *
 170 w32_rootdir (void)
 171 {
 172   static int got_dir;
 173   static char dir[MAX_PATH+5];
 174
 175   if (!got_dir)
 176     {
 177       char *p;
 178
 179       if ( !GetModuleFileName ( NULL, dir, MAX_PATH) )
 180         {
 181           log_debug ("GetModuleFileName failed: %s\n", w32_strerror (0));
 182           *dir = 0;
 183         }
 184       got_dir = 1;
 185       p = strrchr (dir, DIRSEP_C);
 186       if (p)
 187         *p = 0;
 188       else
 189         {
 190           log_debug ("bad filename `%s' returned for this process\n", dir);
 191           *dir = 0;
 192         }
 193     }
 194
 195   if (*dir)
 196     return dir;
 197   /* Fallback to the hardwired value. */
 198   return GNUPG_LIBEXECDIR;
 199 }
 200 #endif /*HAVE_W32_SYSTEM*/
 201
 202
 203
 204
 205 /* Return the name of the sysconfdir.  This is a static string.  This
 206    function is required because under Windows we can't simply compile
 207    it in.  */
 208 const char *
 209 gnupg_sysconfdir (void)
 210 {
 211 #ifdef HAVE_W32_SYSTEM
 212   static char *name;
 213
 214   if (!name)
 215     {
 216       const char *s1, *s2;
 217       s1 = w32_rootdir ();
 218       s2 = DIRSEP_S "etc" DIRSEP_S "gnupg";
 219       name = xmalloc (strlen (s1) + strlen (s2) + 1);
 220       strcpy (stpcpy (name, s1), s2);
 221     }
 222   return name;
 223 #else /*!HAVE_W32_SYSTEM*/
 224   return GNUPG_SYSCONFDIR;
 225 #endif /*!HAVE_W32_SYSTEM*/
 226 }
 227
 228
 229 const char *
 230 gnupg_bindir (void)
 231 {
 232 #ifdef HAVE_W32_SYSTEM
 233   return w32_rootdir ();
 234 #else /*!HAVE_W32_SYSTEM*/
 235   return GNUPG_BINDIR;
 236 #endif /*!HAVE_W32_SYSTEM*/
 237 }
 238
 239
 240 /* Return the name of the libexec directory.  The name is allocated in
 241    a static area on the first use.  This function won't fail. */
 242 const char *
 243 gnupg_libexecdir (void)
 244 {
 245 #ifdef HAVE_W32_SYSTEM
 246   return w32_rootdir ();
 247 #else /*!HAVE_W32_SYSTEM*/
 248   return GNUPG_LIBEXECDIR;
 249 #endif /*!HAVE_W32_SYSTEM*/
 250 }
 251
 252 const char *
 253 gnupg_libdir (void)
 254 {
 255 #ifdef HAVE_W32_SYSTEM
 256   static char *name;
 257
 258   if (!name)
 259     {
 260       const char *s1, *s2;
 261       s1 = w32_rootdir ();
 262       s2 = DIRSEP_S "lib" DIRSEP_S "gnupg";
 263       name = xmalloc (strlen (s1) + strlen (s2) + 1);
 264       strcpy (stpcpy (name, s1), s2);
 265     }
 266   return name;
 267 #else /*!HAVE_W32_SYSTEM*/
 268   return GNUPG_LIBDIR;
 269 #endif /*!HAVE_W32_SYSTEM*/
 270 }
 271
 272 const char *
 273 gnupg_datadir (void)
 274 {
 275 #ifdef HAVE_W32_SYSTEM
 276   static char *name;
 277
 278   if (!name)
 279     {
 280       const char *s1, *s2;
 281       s1 = w32_rootdir ();
 282       s2 = DIRSEP_S "share" DIRSEP_S "gnupg";
 283       name = xmalloc (strlen (s1) + strlen (s2) + 1);
 284       strcpy (stpcpy (name, s1), s2);
 285     }
 286   return name;
 287 #else /*!HAVE_W32_SYSTEM*/
 288   return GNUPG_DATADIR;
 289 #endif /*!HAVE_W32_SYSTEM*/
 290 }
 291
 292
 293 /* Return the file name of a helper tool.  WHICH is one of the
 294    GNUPG_MODULE_NAME_foo constants.  */
 295 const char *
 296 gnupg_module_name (int which)
 297 {
 298   const char *s, *s2;
 299
 300 #define X(a,b) do {                                          \
 301         static char *name;                                   \
 302         if (!name)                                           \
 303           {                                                  \
 304             s = gnupg_ ## a ();                              \
 305             s2 = DIRSEP_S b EXEEXT_S;                        \
 306             name = xmalloc (strlen (s) + strlen (s2) + 1);   \
 307             strcpy (stpcpy (name, s), s2);                   \
 308           }                                                  \
 309         return name;                                         \
 310       } while (0)
 311
 312   switch (which)
 313     {
 314     case GNUPG_MODULE_NAME_AGENT:
 315 #ifdef GNUPG_DEFAULT_AGENT
 316       return GNUPG_DEFAULT_AGENT;
 317 #else
 318       X(bindir, "gpg-agent");
 319 #endif
 320
 321     case GNUPG_MODULE_NAME_PINENTRY:
 322 #ifdef GNUPG_DEFAULT_PINENTRY
 323       return GNUPG_DEFAULT_PINENTRY;
 324 #else
 325       X(bindir, "pinentry");
 326 #endif
 327
 328     case GNUPG_MODULE_NAME_SCDAEMON:
 329 #ifdef GNUPG_DEFAULT_SCDAEMON
 330       return GNUPG_DEFAULT_SCDAEMON;
 331 #else
 332       X(bindir, "scdaemon");
 333 #endif
 334
 335     case GNUPG_MODULE_NAME_DIRMNGR:
 336 #ifdef GNUPG_DEFAULT_DIRMNGR
 337       return GNUPG_DEFAULT_DIRMNGR;
 338 #else
 339       X(bindir, "dirmngr");
 340 #endif
 341
 342     case GNUPG_MODULE_NAME_PROTECT_TOOL:
 343 #ifdef GNUPG_DEFAULT_PROTECT_TOOL
 344       return GNUPG_DEFAULT_PROTECT_TOOL;
 345 #else
 346       X(libexecdir, "gpg-protect-tool");
 347 #endif
 348
 349     default:
 350       BUG ();
 351     }
 352 #undef X
 353 }