src/common/plugin.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 2002-2015 the Claws Mail Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #  include "config.h"
  21 #include "claws-features.h"
  22 #endif
  23
  24 #include <stdio.h>
  25 #ifdef HAVE_VALGRIND
  26 #include <valgrind.h>
  27 #endif
  28
  29 #include "defs.h"
  30 #include <glib.h>
  31 #ifdef ENABLE_NLS
  32 #include <glib/gi18n.h>
  33 #else
  34 #define _(a) (a)
  35 #define N_(a) (a)
  36 #endif
  37 #include <gmodule.h>
  38
  39 #include "utils.h"
  40 #include "plugin.h"
  41 #include "prefs.h"
  42 #include "claws.h"
  43 #include "timing.h"
  44
  45 #ifdef G_OS_WIN32
  46 #define PLUGINS_BLOCK_PREFIX "PluginsWin32_"
  47 #else
  48 #define PLUGINS_BLOCK_PREFIX "Plugins_"
  49 #endif
  50
  51 struct _Plugin
  52 {
  53         gchar   *filename;
  54         GModule *module;
  55         const gchar *(*name) (void);
  56         const gchar *(*desc) (void);
  57         const gchar *(*version) (void);
  58         const gchar *(*type) (void);
  59         const gchar *(*licence) (void);
  60         struct PluginFeature *(*provides) (void);
  61
  62         GSList *rdeps;
  63         gchar *error;
  64         gboolean unloaded_hidden;
  65         gboolean in_prefix_dir;
  66 };
  67
  68 const gchar *plugin_feature_names[] =
  69         { N_("Nothing"),
  70           N_("a viewer"),
  71           N_("a MIME parser"),
  72           N_("folders"),
  73           N_("filtering"),
  74           N_("a privacy interface"),
  75           N_("a notifier"),
  76           N_("an utility"),
  77           N_("things"),
  78           NULL };
  79
  80 /* The plugin must be at least under one of these licences and have
  81    the corresponding token returned by the plugin_licence function.
  82  */
  83 const gchar *plugin_licence_tokens[] = {
  84   "LGPL2.1+", "LGPLv2.1+", "LGPL2.1", "LGPLv2.1",
  85   "LGPL3+", "LGPLv3+", "LGPL3", "LGPLv3",
  86   "GPL3+", "GPLv3+", "GPL3", "GPLv3",
  87   "GPL2+", "GPLv2+",
  88   "Apache2.0", "Apache 2.0", "Apache v2.0",
  89   "2-clause BSD", "Simplified BSD", "FreeBSD",
  90   "3-clause BSD", "New BSD", "Modified BSD",
  91   NULL
  92 };
  93
  94 /* Dual (or more) licences are allowed, must be separated by one of these.
  95  */
  96 #define IS_LICENCE_SEP(a) ((a) == ',' || (a) == ';' || (a) == '|' || (a) == '/' || (a) == '\0')
  97
  98 /**
  99  * List of all loaded plugins
 100  */
 101 GSList *plugins = NULL;
 102 GSList *plugin_types = NULL;
 103
 104 /*
 105  * List of plugins unloaded for some fixable reason
 106  */
 107 static GSList *unloaded_plugins = NULL;
 108
 109 static gint list_find_by_string(gconstpointer data, gconstpointer str)
 110 {
 111         return strcmp((gchar *)data, (gchar *)str) ? TRUE : FALSE;
 112 }
 113
 114 static gint list_find_by_plugin_filename(const Plugin *plugin, const gchar *filename)
 115 {
 116         /* FIXME: There is a problem in case of symlinks or when a
 117            user tries to load a plugin with the same name from a
 118            different directory.  I think it would be better to compare
 119            only the basename of the filename here (case-insensitive on
 120            W32). */
 121         cm_return_val_if_fail(plugin, 1);
 122         cm_return_val_if_fail(plugin->filename, 1);
 123         cm_return_val_if_fail(filename, 1);
 124         return strcmp(filename, plugin->filename);
 125 }
 126
 127 static gboolean plugin_filename_is_standard_dir(const gchar *filename) {
 128         return strncmp(filename, get_plugin_dir(), strlen(get_plugin_dir())) == 0;
 129 }
 130
 131 static gchar * plugin_canonical_name(const Plugin *plugin)
 132 {
 133         if (plugin->in_prefix_dir == TRUE) {
 134                 if (plugin_filename_is_standard_dir(plugin->filename) == TRUE) {
 135                         gchar *plugin_name = g_path_get_basename(plugin->filename);
 136                         return plugin_name;
 137                 }
 138         }
 139         return g_strdup(plugin->filename);
 140 }
 141
 142 void plugin_save_list(void)
 143 {
 144         gchar *rcpath, *block;
 145         PrefFile *pfile;
 146         GSList *type_cur, *plugin_cur;
 147         Plugin *plugin;
 148
 149         for (type_cur = plugin_types; type_cur != NULL; type_cur = g_slist_next(type_cur)) {
 150                 rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 151                 block = g_strconcat(PLUGINS_BLOCK_PREFIX, type_cur->data, NULL);
 152                 if ((pfile = prefs_write_open(rcpath)) == NULL ||
 153                     (prefs_set_block_label(pfile, block) < 0)) {
 154                         g_warning("failed to write plugin list");
 155                         g_free(rcpath);
 156                         return;
 157                 }
 158                 g_free(block);
 159
 160                 for (plugin_cur = plugins; plugin_cur != NULL; plugin_cur = g_slist_next(plugin_cur)) {
 161                         plugin = (Plugin *) plugin_cur->data;
 162
 163                         if (plugin->unloaded_hidden)
 164                                 continue;
 165
 166                         if (!strcmp(plugin->type(), type_cur->data)) {
 167                                 gchar * name = plugin_canonical_name(plugin);
 168                                 int err = fprintf(pfile->fp, "%s\n", name);
 169                                 g_free(name);
 170                                 if (err < 0)
 171                                         goto revert;
 172                         }
 173                 }
 174                 for (plugin_cur = unloaded_plugins; plugin_cur != NULL; plugin_cur = g_slist_next(plugin_cur)) {
 175                         plugin = (Plugin *) plugin_cur->data;
 176
 177                         if (plugin->unloaded_hidden)
 178                                 continue;
 179
 180                         if (!strcmp(plugin->type(), type_cur->data)) {
 181                                 gchar * name = plugin_canonical_name(plugin);
 182                                 int err = fprintf(pfile->fp, "%s\n", name);
 183                                 g_free(name);
 184                                 if (err < 0)
 185                                         goto revert;
 186                         }
 187                 }
 188                 if (fprintf(pfile->fp, "\n") < 0)
 189                         goto revert;
 190
 191                 if (prefs_file_close(pfile) < 0)
 192                         g_warning("failed to write plugin list");
 193
 194                 g_free(rcpath);
 195
 196                 continue;
 197
 198 revert:
 199                 g_warning("failed to write plugin list");
 200                 if (prefs_file_close_revert(pfile) < 0)
 201                         g_warning("failed to revert plugin list");
 202
 203                 g_free(rcpath);
 204         }
 205 }
 206
 207 static gboolean plugin_is_loaded(const gchar *filename)
 208 {
 209         return (g_slist_find_custom(plugins, filename,
 210                   (GCompareFunc)list_find_by_plugin_filename) != NULL);
 211 }
 212
 213 static Plugin *plugin_get_by_filename(const gchar *filename)
 214 {
 215         GSList *cur = plugins;
 216         for(; cur; cur = cur->next) {
 217                 Plugin *p = (Plugin *)cur->data;
 218                 if (!strcmp(p->filename, filename)) {
 219                         return p;
 220                 }
 221         }
 222         return NULL;
 223 }
 224
 225 /**
 226  * Loads a plugin dependancies
 227  *
 228  * Plugin dependancies are, optionnaly, listed in a file in
 229  * get_plugin_dir()/$pluginname.deps.
 230  * \param filename The filename of the plugin for which we have to load deps
 231  * \param error The location where an error string can be stored
 232  * \return 0 on success, -1 otherwise
 233  */
 234 static gint plugin_load_deps(const gchar *filename, gchar **error)
 235 {
 236         gchar *tmp;
 237         gchar *deps_file = NULL;
 238         FILE *fp = NULL;
 239         gchar buf[BUFFSIZE];
 240         gchar *p;
 241
 242         tmp = g_strdup(filename);
 243         if( (p = strrchr(tmp, '.')) )
 244           *p = '\0';
 245         deps_file = g_strconcat(tmp, ".deps", NULL);
 246         g_free(tmp);
 247
 248         fp = g_fopen(deps_file, "rb");
 249         g_free(deps_file);
 250
 251         if (!fp)
 252                 return 0;
 253
 254         while (fgets(buf, sizeof(buf), fp) != NULL) {
 255                 Plugin *dep_plugin = NULL;
 256                 gchar *path = NULL;
 257                 buf[strlen(buf)-1]='\0'; /* chop off \n */
 258                 path = g_strconcat(get_plugin_dir(), buf,
 259                                 ".", G_MODULE_SUFFIX, NULL);
 260                 if ((dep_plugin = plugin_get_by_filename(path)) == NULL) {
 261                         debug_print("trying to load %s\n", path);
 262                         dep_plugin = plugin_load(path, error);
 263                         if (dep_plugin == NULL) {
 264                                 g_free(path);
 265                                 fclose(fp);
 266                                 return -1;
 267                         }
 268                         dep_plugin->in_prefix_dir = TRUE;
 269                 }
 270                 g_free(path);
 271                 if (!g_slist_find_custom(dep_plugin->rdeps,
 272                                 (gpointer) filename, list_find_by_string)) {
 273                         debug_print("adding %s to %s rdeps\n",
 274                                 filename,
 275                                 dep_plugin->filename);
 276                         dep_plugin->rdeps =
 277                                 g_slist_append(dep_plugin->rdeps,
 278                                         g_strdup(filename));
 279                 }
 280         }
 281         fclose(fp);
 282         return 0;
 283 }
 284
 285 static void plugin_unload_rdeps(Plugin *plugin)
 286 {
 287         GSList *cur = plugin->rdeps;
 288         debug_print("removing %s rdeps\n", plugin->filename);
 289         while (cur) {
 290                 gchar *file = (gchar *)cur->data;
 291                 Plugin *rdep_plugin = file?plugin_get_by_filename(file):NULL;
 292                 debug_print(" rdep %s: %p\n", file, rdep_plugin);
 293                 if (rdep_plugin) {
 294                         plugin_unload(rdep_plugin);
 295                 }
 296                 g_free(file);
 297                 cur = cur->next;
 298         }
 299         g_slist_free(plugin->rdeps);
 300         plugin->rdeps = NULL;
 301 }
 302
 303 static void plugin_remove_from_unloaded_list (const gchar *filename)
 304 {
 305         GSList *item = g_slist_find_custom(unloaded_plugins,
 306                                 (gpointer) filename, (GCompareFunc)list_find_by_plugin_filename);
 307         Plugin *unloaded_plugin = item ? ((Plugin *)item->data):NULL;
 308         if (unloaded_plugin != NULL) {
 309                 debug_print("removing %s from unloaded list\n", unloaded_plugin->filename);
 310                 unloaded_plugins = g_slist_remove(unloaded_plugins, unloaded_plugin);
 311                 g_module_close(unloaded_plugin->module);
 312                 g_free(unloaded_plugin->filename);
 313                 g_free(unloaded_plugin->error);
 314                 g_free(unloaded_plugin);
 315         }
 316 }
 317
 318 static gchar *plugin_check_features(struct PluginFeature *features) {
 319         int i = 0, j = 0;
 320         GSList *cur = plugins;
 321
 322         if (features == NULL)
 323                 return NULL;
 324         for(; cur; cur = cur->next) {
 325                 Plugin *p = (Plugin *)cur->data;
 326                 struct PluginFeature *cur_features = p->provides();
 327                 if (p->unloaded_hidden)
 328                         continue;
 329                 for (j = 0; cur_features[j].type != PLUGIN_NOTHING; j++) {
 330                         for (i = 0; features[i].type != PLUGIN_NOTHING; i++) {
 331                                 if (cur_features[j].type == features[i].type &&
 332                                     !strcmp(cur_features[j].subtype, features[i].subtype)) {
 333                                         return g_strdup_printf(_(
 334                                                 "This plugin provides %s (%s), which is "
 335                                                 "already provided by the %s plugin."),
 336                                                 _(plugin_feature_names[features[i].type]),
 337                                                 _(features[i].subtype),
 338                                                 p->name());
 339                                 }
 340                         }
 341                 }
 342         }
 343
 344         return NULL;
 345 }
 346
 347 static gboolean plugin_licence_check(const gchar *licence) {
 348         gint i = 0;
 349         gint len = 0;
 350
 351         if (licence != NULL) {
 352                 len = strlen(licence);
 353         }
 354         if (len == 0) {
 355                 g_warning("plugin licence check failed: empty licence");
 356                 return FALSE;
 357         }
 358         while (plugin_licence_tokens[i] != NULL) {
 359                 gchar *found = g_strstr_len(licence, len, plugin_licence_tokens[i]);
 360                 if (found != NULL) {
 361                         gint tlen = strlen(plugin_licence_tokens[i]);
 362                         if (len != tlen) { /* not a single license */
 363                                 if (((found == licence) &&  (!IS_LICENCE_SEP(licence[tlen])))
 364                                                 || (!IS_LICENCE_SEP(*(found - 1)))
 365                                                 || (!IS_LICENCE_SEP(*(found + tlen)))) {
 366                                         debug_print("plugin licence check failed: invalid separator\n");
 367                                         return FALSE;
 368                                 }
 369                         }
 370                         debug_print("plugin licence check passed: %s found\n", plugin_licence_tokens[i]);
 371                         return TRUE;
 372                 }
 373                 ++i;
 374         }
 375         debug_print("plugin licence check failed: %s is not a valid licence\n", licence);
 376         return FALSE;
 377 }
 378
 379 static Plugin *plugin_load_in_default_dir(const gchar *filename, gchar **error)
 380 {
 381         Plugin *plugin = NULL;
 382         gchar *filename_default_dir = NULL;
 383         gchar *default_error = NULL;
 384         gchar *plugin_name = g_path_get_basename(filename);
 385
 386         filename_default_dir = g_strconcat(get_plugin_dir(), plugin_name, NULL);
 387
 388         debug_print("trying to load %s in default plugin directory %s\n",
 389                     plugin_name, get_plugin_dir());
 390
 391         g_free(plugin_name);
 392
 393         plugin = plugin_load(filename_default_dir, &default_error);
 394
 395         g_free(filename_default_dir);
 396
 397         if (plugin) {
 398                 g_free(*error);
 399                 *error = NULL;
 400                 plugin->in_prefix_dir = TRUE;
 401
 402         } else {
 403                 g_free(default_error);
 404         }
 405
 406         return plugin;
 407 }
 408
 409 /**
 410  * Loads a plugin
 411  *
 412  * \param filename The filename of the plugin to load
 413  * \param error The location where an error string can be stored
 414  * \return the plugin on success, NULL otherwise
 415  */
 416 Plugin *plugin_load(const gchar *filename, gchar **error)
 417 {
 418         Plugin *plugin;
 419         gint (*plugin_init) (gchar **error);
 420         gpointer plugin_name, plugin_desc, plugin_version;
 421         const gchar *(*plugin_type)(void);
 422         const gchar *(*plugin_licence)(void);
 423         struct PluginFeature *(*plugin_provides)(void);
 424
 425         gint ok;
 426         START_TIMING((filename?filename:"NULL plugin"));
 427         cm_return_val_if_fail(filename != NULL, NULL);
 428         cm_return_val_if_fail(error != NULL, NULL);
 429
 430         /* check duplicate plugin path name */
 431         if (plugin_is_loaded(filename)) {
 432                 plugin = plugin_get_by_filename(filename);
 433                 if (plugin->unloaded_hidden) {
 434                         /* reshow it */
 435                         goto init_plugin;
 436                 } else {
 437                         *error = g_strdup(_("Plugin already loaded"));
 438                         return NULL;
 439                 }
 440         }
 441
 442         plugin_remove_from_unloaded_list(filename);
 443
 444         if (plugin_load_deps(filename, error) < 0)
 445                 return NULL;
 446         plugin = g_new0(Plugin, 1);
 447         if (plugin == NULL) {
 448                 *error = g_strdup(_("Failed to allocate memory for Plugin"));
 449                 return NULL;
 450         }
 451
 452         debug_print("trying to load `%s'\n", filename);
 453         plugin->module = g_module_open(filename, 0);
 454         if (plugin->module == NULL) {
 455                 *error = g_strdup(g_module_error());
 456                 g_free(plugin);
 457                 if (!plugin_filename_is_standard_dir(filename))
 458                         return plugin_load_in_default_dir(filename, error);
 459                 else
 460                         return NULL;
 461         } else {
 462                 plugin->in_prefix_dir = FALSE;
 463         }
 464
 465 init_plugin:
 466         if (!g_module_symbol(plugin->module, "plugin_name", &plugin_name) ||
 467             !g_module_symbol(plugin->module, "plugin_desc", &plugin_desc) ||
 468             !g_module_symbol(plugin->module, "plugin_version", &plugin_version) ||
 469             !g_module_symbol(plugin->module, "plugin_type", (gpointer)&plugin_type) ||
 470             !g_module_symbol(plugin->module, "plugin_licence", (gpointer)&plugin_licence) ||
 471             !g_module_symbol(plugin->module, "plugin_provides", (gpointer)&plugin_provides) ||
 472             !g_module_symbol(plugin->module, "plugin_init", (gpointer)&plugin_init)) {
 473                 *error = g_strdup(g_module_error());
 474                 if (plugin->unloaded_hidden)
 475                         return NULL;
 476                 g_module_close(plugin->module);
 477                 g_free(plugin);
 478                 return NULL;
 479         }
 480
 481         if (plugin_licence_check(plugin_licence()) != TRUE) {
 482                 *error = g_strdup(_("This module is not licensed under a GPL v3 or later compatible license."));
 483                 if (plugin->unloaded_hidden)
 484                         return NULL;
 485                 g_module_close(plugin->module);
 486                 g_free(plugin);
 487                 return NULL;
 488         }
 489
 490         if (!strcmp(plugin_type(), "GTK")) {
 491                 *error = g_strdup(_("This module is for Claws Mail GTK1."));
 492                 if (plugin->unloaded_hidden)
 493                         return NULL;
 494                 g_module_close(plugin->module);
 495                 g_free(plugin);
 496                 return NULL;
 497         }
 498
 499         if ((*error = plugin_check_features(plugin_provides())) != NULL) {
 500                 if (plugin->unloaded_hidden)
 501                         return NULL;
 502                 g_module_close(plugin->module);
 503                 g_free(plugin);
 504                 return NULL;
 505         }
 506         plugin->name = plugin_name;
 507         plugin->desc = plugin_desc;
 508         plugin->version = plugin_version;
 509         plugin->type = plugin_type;
 510         plugin->licence = plugin_licence;
 511         plugin->provides = plugin_provides;
 512         plugin->filename = g_strdup(filename);
 513         plugin->error = NULL;
 514
 515         if ((ok = plugin_init(error)) < 0) {
 516                 if (*error)
 517                         plugin->error = g_strdup(*error);
 518                 unloaded_plugins = g_slist_append(unloaded_plugins, plugin);
 519                 return NULL;
 520         }
 521
 522         if (!plugin->unloaded_hidden)
 523                 plugins = g_slist_append(plugins, plugin);
 524         plugin->unloaded_hidden = FALSE;
 525
 526         debug_print("Plugin %s (from file %s) loaded\n", plugin->name(), filename);
 527         END_TIMING();
 528         return plugin;
 529 }
 530
 531 void plugin_unload(Plugin *plugin)
 532 {
 533         gboolean (*plugin_done) (void);
 534         gboolean can_unload = TRUE;
 535
 536         plugin_unload_rdeps(plugin);
 537
 538         if (plugin->unloaded_hidden)
 539                 return;
 540
 541         if (plugin->error) {
 542                 plugin_remove_from_unloaded_list(plugin->filename);
 543                 return;
 544         }
 545         if (g_module_symbol(plugin->module, "plugin_done", (gpointer) &plugin_done)) {
 546                 can_unload = plugin_done();
 547         }
 548
 549         if (can_unload) {
 550 #ifdef HAVE_VALGRIND
 551                 if (!RUNNING_ON_VALGRIND) {
 552                         g_module_close(plugin->module);
 553                 }
 554 #else
 555                 g_module_close(plugin->module);
 556 #endif
 557                 plugins = g_slist_remove(plugins, plugin);
 558                 g_free(plugin->filename);
 559                 g_free(plugin);
 560         } else {
 561                 plugin->unloaded_hidden = TRUE;
 562         }
 563
 564 }
 565
 566 static void replace_old_plugin_name(gchar *plugin_name)
 567 {
 568         gchar *old_name_end = g_strconcat("_plugin.", G_MODULE_SUFFIX, NULL);
 569         gchar *matches = strstr(plugin_name, old_name_end);
 570
 571         if (!matches) {
 572                 g_free(old_name_end);
 573                 return;
 574         } else if (plugin_name + strlen(plugin_name) != matches + strlen(matches)) {
 575                 g_free(old_name_end);
 576                 return;
 577         } else {
 578                 gchar *new_name_end = g_strconcat(".", G_MODULE_SUFFIX, NULL);
 579                 int offset = strlen(plugin_name) - strlen(old_name_end);
 580
 581                 debug_print("Replacing old plugin name %s\n", plugin_name);
 582
 583                 strncpy(plugin_name + offset, new_name_end, strlen(old_name_end) - 1);
 584                 debug_print(" to %s\n", plugin_name);
 585         }
 586 }
 587
 588 void plugin_load_all(const gchar *type)
 589 {
 590         gchar *rcpath;
 591         gchar buf[BUFFSIZE];
 592         PrefFile *pfile;
 593         gchar *error = NULL, *block;
 594
 595         plugin_types = g_slist_append(plugin_types, g_strdup(type));
 596
 597         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 598         block = g_strconcat(PLUGINS_BLOCK_PREFIX, type, NULL);
 599         if ((pfile = prefs_read_open(rcpath)) == NULL ||
 600             (prefs_set_block_label(pfile, block) < 0)) {
 601                 g_free(rcpath);
 602                 if (pfile)
 603                         prefs_file_close(pfile);
 604                 return;
 605         }
 606         g_free(block);
 607
 608         while (fgets(buf, sizeof(buf), pfile->fp) != NULL) {
 609                 if (buf[0] == '[')
 610                         break;
 611
 612                 g_strstrip(buf);
 613                 replace_old_plugin_name(buf);
 614
 615                 if ((buf[0] != '\0') && (plugin_load(buf, &error) == NULL)) {
 616                         g_warning("plugin loading error: %s", error);
 617                         g_free(error);
 618                 }
 619         }
 620         prefs_file_close(pfile);
 621
 622         g_free(rcpath);
 623 }
 624
 625 void plugin_unload_all(const gchar *type)
 626 {
 627         GSList *list, *cur;
 628
 629         list = g_slist_copy(plugins);
 630         list = g_slist_reverse(list);
 631
 632         for(cur = list; cur != NULL; cur = g_slist_next(cur)) {
 633                 Plugin *plugin = (Plugin *) cur->data;
 634
 635                 if (!strcmp(type, plugin->type()))
 636                         plugin_unload(plugin);
 637         }
 638         g_slist_free(list);
 639
 640         cur = g_slist_find_custom(plugin_types, (gpointer) type, list_find_by_string);
 641         if (cur) {
 642                 g_free(cur->data);
 643                 plugin_types = g_slist_remove(plugin_types, cur);
 644         }
 645 }
 646
 647
 648 /* Load those plugins we always want to use.  No error output; just
 649  * try. */
 650 void plugin_load_standard_plugins (void)
 651 {
 652         static const char *names[] = {
 653 #ifdef G_OS_WIN32
 654                 "pgpmime",
 655                 "pgpinline",
 656 #else
 657                 /* post-2.5 maybe
 658                 "bogofilter", */
 659 #endif
 660                 NULL
 661         };
 662         int i;
 663         gchar *error, *filename;
 664
 665         for (i=0; names[i]; i++) {
 666                 /* Simple hack to check whether the plugin has already
 667                  * been loaded but checking only for the basename. */
 668                 GSList *cur = plugins;
 669                 for(; cur; cur = cur->next) {
 670                         Plugin *p = (Plugin *)cur->data;
 671                         if (strstr(p->filename, names[i]))
 672                                 break;
 673                 }
 674                 if (!cur) { /* Not yet loaded. */
 675                         /* FIXME: get_plugin_dir () returns with a trailing
 676                          * (back)slash; this should be fixed so that we can use
 677                          * g_module_build_path here. */
 678 #ifdef G_OS_WIN32
 679                         filename = g_strconcat (get_plugin_dir(),
 680                                                 names[i], NULL);
 681 #else
 682                         filename = g_strconcat (get_plugin_dir(),
 683                                                 names[i], ".", G_MODULE_SUFFIX, NULL);
 684 #endif
 685                         error = NULL;
 686                         plugin_load(filename, &error);
 687                         g_free (error);
 688                         g_free(filename);
 689                 }
 690         }
 691 }
 692
 693 GSList *plugin_get_list(void)
 694 {
 695         GSList *new = NULL;
 696         GSList *cur = plugins;
 697         for (; cur; cur = cur->next) {
 698                 Plugin *p = (Plugin *)cur->data;
 699                 if (!p->unloaded_hidden)
 700                         new = g_slist_prepend(new, p);
 701         }
 702         new = g_slist_reverse(new);
 703         return new;
 704 }
 705
 706 Plugin *plugin_get_loaded_by_name(const gchar *name)
 707 {
 708         Plugin *plugin = NULL;
 709         GSList *new, *cur;
 710         new = plugin_get_list();
 711         for (cur = new; cur; cur = g_slist_next(cur)) {
 712                 plugin = (Plugin *)cur->data;
 713                 if (!g_ascii_strcasecmp(plugin->name(), name))
 714                         break;
 715                 else
 716                         plugin = NULL;
 717         }
 718         g_slist_free(new);
 719         return plugin;
 720 }
 721
 722 GSList *plugin_get_unloaded_list(void)
 723 {
 724         return g_slist_copy(unloaded_plugins);
 725 }
 726
 727 const gchar *plugin_get_name(Plugin *plugin)
 728 {
 729         return plugin->name();
 730 }
 731
 732 const gchar *plugin_get_desc(Plugin *plugin)
 733 {
 734         return plugin->desc();
 735 }
 736
 737 const gchar *plugin_get_version(Plugin *plugin)
 738 {
 739         return plugin->version();
 740 }
 741
 742 const gchar *plugin_get_error(Plugin *plugin)
 743 {
 744         return plugin->error;
 745 }
 746
 747 /* Generally called in plugin_init() function of each plugin. It check the
 748  * minimal and compiled version of claws binary required by the plugin.
 749  * If (@minimum_claws_version == 0 || @compiled_claws_version == 0), don't
 750  * check the corresponding version.
 751  *
 752  * If an error occurs {
 753  *      If @error == NULL { don't allocate error string. }
 754  *      If @error != NULL { error string is allocated and must be freed after
 755  *                              call function. }
 756  * }
 757  * Returns: FALSE if an error occurs, TRUE if all is OK.
 758  */
 759 gint check_plugin_version(guint32 minimum_claws_version,
 760                          guint32 compiled_claws_version,
 761                          const gchar *plugin_name,
 762                          gchar **error)
 763 {
 764         guint32 claws_version = claws_get_version();
 765
 766         if (compiled_claws_version != 0 && claws_version > compiled_claws_version) {
 767                 if (error != NULL) {
 768                         *error = (plugin_name && *plugin_name)
 769                                 ? g_strdup_printf(_("Your version of Claws Mail is newer than the "
 770                                                         "version the '%s' plugin was built with."),
 771                                                 plugin_name)
 772                                 : g_strdup(_("Your version of Claws Mail is newer than the "
 773                                                         "version the plugin was built with."));
 774                 }
 775                 return FALSE;
 776         }
 777
 778         if (minimum_claws_version != 0 && claws_version < minimum_claws_version) {
 779                 if (error != NULL) {
 780                         *error = (plugin_name && *plugin_name)
 781                                 ? g_strdup_printf(_("Your version of Claws Mail is too old for "
 782                                                         "the '%s' plugin."), plugin_name)
 783                                 : g_strdup(_("Your version of Claws Mail is too old for the plugin."));
 784                 }
 785                 return FALSE;
 786         }
 787         return TRUE;
 788 }