ROX-Filer/src/diritem.c

   1 /*
   2  * ROX-Filer, filer for the ROX desktop project
   3  * Copyright (C) 2006, Thomas Leonard and others (see changelog for details).
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the Free
   7  * Software Foundation; either version 2 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  17  * Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 /* diritem.c - get details about files */
  21
  22 /* Don't load icons larger than 400K (this is rather excessive, basically
  23  * we just want to stop people crashing the filer with huge icons).
  24  */
  25 #define MAX_ICON_SIZE (400 * 1024)
  26
  27 #include "config.h"
  28
  29 #include <gtk/gtk.h>
  30 #include <errno.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34
  35 #include "global.h"
  36
  37 #include "diritem.h"
  38 #include "support.h"
  39 #include "gui_support.h"
  40 #include "mount.h"
  41 #include "type.h"
  42 #include "usericons.h"
  43 #include "options.h"
  44 #include "fscache.h"
  45 #include "pixmaps.h"
  46 #include "xtypes.h"
  47
  48 #define RECENT_DELAY (5 * 60)   /* Time in seconds to consider a file recent */
  49 #define ABOUT_NOW(time) (diritem_recent_time - time < RECENT_DELAY)
  50 /* If you want to make use of the RECENT flag, make sure this is set to
  51  * the current time before calling diritem_restat().
  52  */
  53 time_t diritem_recent_time;
  54
  55 /* Static prototypes */
  56 static void examine_dir(const guchar *path, DirItem *item,
  57                         struct stat *link_target);
  58
  59 /****************************************************************
  60  *                      EXTERNAL INTERFACE                      *
  61  ****************************************************************/
  62
  63 void diritem_init(void)
  64 {
  65         read_globicons();
  66 }
  67
  68 /* Bring this item's structure uptodate.
  69  * 'parent' is optional; it saves one stat() for directories.
  70  */
  71 void diritem_restat(const guchar *path, DirItem *item, struct stat *parent)
  72 {
  73         struct stat     info;
  74
  75         if (item->_image)
  76         {
  77                 g_object_unref(item->_image);
  78                 item->_image = NULL;
  79         }
  80         item->flags = 0;
  81         item->mime_type = NULL;
  82
  83         if (mc_lstat(path, &info) == -1)
  84         {
  85                 item->lstat_errno = errno;
  86                 item->base_type = TYPE_ERROR;
  87                 item->size = 0;
  88                 item->mode = 0;
  89                 item->mtime = item->ctime = item->atime = 0;
  90                 item->uid = (uid_t) -1;
  91                 item->gid = (gid_t) -1;
  92         }
  93         else
  94         {
  95                 guchar *target_path;
  96
  97                 item->lstat_errno = 0;
  98                 item->size = info.st_size;
  99                 item->mode = info.st_mode;
 100                 item->atime = info.st_atime;
 101                 item->ctime = info.st_ctime;
 102                 item->mtime = info.st_mtime;
 103                 item->uid = info.st_uid;
 104                 item->gid = info.st_gid;
 105                 if (ABOUT_NOW(item->mtime) || ABOUT_NOW(item->ctime))
 106                         item->flags |= ITEM_FLAG_RECENT;
 107
 108                 if (xattr_have(path))
 109                         item->flags |= ITEM_FLAG_HAS_XATTR;
 110
 111                 if (S_ISLNK(info.st_mode))
 112                 {
 113                         if (mc_stat(path, &info))
 114                                 item->base_type = TYPE_ERROR;
 115                         else
 116                                 item->base_type =
 117                                         mode_to_base_type(info.st_mode);
 118
 119                         item->flags |= ITEM_FLAG_SYMLINK;
 120
 121                         target_path = readlink_dup(path);
 122                 }
 123                 else
 124                 {
 125                         item->base_type = mode_to_base_type(info.st_mode);
 126                         target_path = (guchar *) path;
 127                 }
 128
 129                 if (item->base_type == TYPE_DIRECTORY)
 130                 {
 131                         if (mount_is_mounted(target_path, &info,
 132                                         target_path == path ? parent : NULL))
 133                                 item->flags |= ITEM_FLAG_MOUNT_POINT
 134                                                 | ITEM_FLAG_MOUNTED;
 135                         else if (g_hash_table_lookup(fstab_mounts,
 136                                                         target_path))
 137                                 item->flags |= ITEM_FLAG_MOUNT_POINT;
 138                 }
 139
 140                 if (path != target_path)
 141                         g_free(target_path);
 142         }
 143
 144         if (item->base_type == TYPE_DIRECTORY)
 145         {
 146                 /* KRJW: info.st_uid will be the uid of the dir, regardless
 147                  * of whether `path' is a dir or a symlink to one.  Note that
 148                  * if path is a symlink to a dir, item->uid will be the uid
 149                  * of the *symlink*, but we really want the uid of the dir
 150                  * to which the symlink points.
 151                  */
 152                 examine_dir(path, item, &info);
 153         }
 154         else if (item->base_type == TYPE_FILE)
 155         {
 156                 if (item->size == 0)
 157                         item->mime_type = text_plain;
 158                 else if (item->flags & ITEM_FLAG_SYMLINK)
 159                 {
 160                         guchar *link_path;
 161                         link_path = pathdup(path);
 162                         item->mime_type = type_from_path(link_path
 163                                         ? link_path
 164                                         : path);
 165                         g_free(link_path);
 166                 }
 167                 else
 168                         item->mime_type = type_from_path(path);
 169
 170                 /* Note: for symlinks we need the mode of the target */
 171                 if (info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))
 172                 {
 173                         /* Note that the flag is set for ALL executable
 174                          * files, but the mime_type must also be executable
 175                          * for clicking on the file to run it.
 176                          */
 177                         item->flags |= ITEM_FLAG_EXEC_FILE;
 178
 179                         if (item->mime_type == NULL ||
 180                             item->mime_type == application_octet_stream)
 181                         {
 182                                 item->mime_type = application_executable;
 183                         }
 184                         else if (item->mime_type == text_plain &&
 185                                  !strchr(item->leafname, '.'))
 186                         {
 187                                 item->mime_type = application_x_shellscript;
 188                         }
 189                 }
 190                 else if (item->mime_type == application_x_desktop)
 191                 {
 192                         item->flags |= ITEM_FLAG_EXEC_FILE;
 193                 }
 194
 195                 if (!item->mime_type)
 196                         item->mime_type = text_plain;
 197
 198                 check_globicon(path, item);
 199
 200                 if (item->mime_type == application_x_desktop && item->_image == NULL)
 201                 {
 202                         item->_image = g_fscache_lookup(desktop_icon_cache, path);
 203                 }
 204         }
 205         else
 206                 check_globicon(path, item);
 207
 208         if (!item->mime_type)
 209                 item->mime_type = mime_type_from_base_type(item->base_type);
 210 }
 211
 212 DirItem *diritem_new(const guchar *leafname)
 213 {
 214         DirItem         *item;
 215
 216         item = g_new(DirItem, 1);
 217         item->leafname = g_strdup(leafname);
 218         item->may_delete = FALSE;
 219         item->_image = NULL;
 220         item->base_type = TYPE_UNKNOWN;
 221         item->flags = ITEM_FLAG_NEED_RESCAN_QUEUE;
 222         item->mime_type = NULL;
 223         item->leafname_collate = collate_key_new(leafname);
 224
 225         return item;
 226 }
 227
 228 void diritem_free(DirItem *item)
 229 {
 230         g_return_if_fail(item != NULL);
 231
 232         if (item->_image)
 233                 g_object_unref(item->_image);
 234         item->_image = NULL;
 235         collate_key_free(item->leafname_collate);
 236         g_free(item->leafname);
 237         g_free(item);
 238 }
 239
 240 /* For use by di_image() only. Sets item->_image. */
 241 void _diritem_get_image(DirItem *item)
 242 {
 243         g_return_if_fail(item->_image == NULL);
 244
 245         if (item->base_type == TYPE_ERROR)
 246         {
 247                 item->_image = im_error;
 248                 g_object_ref(im_error);
 249         }
 250         else
 251                 item->_image = type_to_icon(item->mime_type);
 252 }
 253
 254 /****************************************************************
 255  *                      INTERNAL FUNCTIONS                      *
 256  ****************************************************************/
 257
 258 /* Fill in more details of the DirItem for a directory item.
 259  * - Looks for an image (but maybe still NULL on error)
 260  * - Updates ITEM_FLAG_APPDIR
 261  *
 262  * link_target contains stat info for the link target for symlinks (or for the
 263  * item itself if not a link).
 264  */
 265 static void examine_dir(const guchar *path, DirItem *item,
 266                         struct stat *link_target)
 267 {
 268         struct stat info;
 269         static GString *tmp = NULL;
 270         uid_t uid = link_target->st_uid;
 271
 272         if (!tmp)
 273                 tmp = g_string_new(NULL);
 274
 275         check_globicon(path, item);
 276
 277         if (item->flags & ITEM_FLAG_MOUNT_POINT)
 278         {
 279                 item->mime_type = inode_mountpoint;
 280                 return;         /* Try to avoid automounter problems */
 281         }
 282
 283         if (link_target->st_mode & S_IWOTH)
 284                 return;         /* Don't trust world-writable dirs */
 285
 286         /* Finding the icon:
 287          *
 288          * - If it contains a .DirIcon then that's the icon
 289          * - If it contains an AppRun then it's an application
 290          * - If it contains an AppRun but no .DirIcon then try to
 291          *   use AppIcon.xpm as the icon.
 292          *
 293          * .DirIcon and AppRun must have the same owner as the
 294          * directory itself, to prevent abuse of /tmp, etc.
 295          * For symlinks, we want the symlink's owner.
 296          */
 297
 298         g_string_printf(tmp, "%s/.DirIcon", path);
 299
 300         if (item->_image)
 301                 goto no_diricon;        /* Already got an icon */
 302
 303         if (mc_lstat(tmp->str, &info) != 0 || info.st_uid != uid)
 304                 goto no_diricon;        /* Missing, or wrong owner */
 305
 306         if (S_ISLNK(info.st_mode) && mc_stat(tmp->str, &info) != 0)
 307                 goto no_diricon;        /* Bad symlink */
 308
 309         if (info.st_size > MAX_ICON_SIZE || !S_ISREG(info.st_mode))
 310                 goto no_diricon;        /* Too big, or non-regular file */
 311
 312         /* Try to load image; may still get NULL... */
 313         item->_image = g_fscache_lookup(pixmap_cache, tmp->str);
 314
 315 no_diricon:
 316
 317         /* Try to find AppRun... */
 318         g_string_truncate(tmp, tmp->len - 8);
 319         g_string_append(tmp, "AppRun");
 320
 321         if (mc_lstat(tmp->str, &info) != 0 || info.st_uid != uid)
 322                 goto out;       /* Missing, or wrong owner */
 323
 324         if (!(info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
 325                 goto out;       /* Not executable */
 326
 327         item->flags |= ITEM_FLAG_APPDIR;
 328
 329         /* Try to load AppIcon.xpm... */
 330
 331         if (item->_image)
 332                 goto out;       /* Already got an icon */
 333
 334         g_string_truncate(tmp, tmp->len - 3);
 335         g_string_append(tmp, "Icon.xpm");
 336
 337         /* Note: since AppRun is valid we don't need to check AppIcon.xpm
 338          *       so carefully.
 339          */
 340
 341         if (mc_stat(tmp->str, &info) != 0)
 342                 goto out;       /* Missing, or broken symlink */
 343
 344         if (info.st_size > MAX_ICON_SIZE || !S_ISREG(info.st_mode))
 345                 goto out;       /* Too big, or non-regular file */
 346
 347         /* Try to load image; may still get NULL... */
 348         item->_image = g_fscache_lookup(pixmap_cache, tmp->str);
 349
 350 out:
 351
 352         if ((item->flags & ITEM_FLAG_APPDIR) && !item->_image)
 353         {
 354                 /* This is an application without an icon */
 355                 item->_image = im_appdir;
 356                 g_object_ref(item->_image);
 357         }
 358 }