src/common/plugin.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 Hiroyuki Yamamoto and 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
  20
  21 #ifdef HAVE_CONFIG_H
  22 #  include "config.h"
  23 #include "claws-features.h"
  24 #endif
  25
  26 #include <stdio.h>
  27 #ifdef HAVE_VALGRIND
  28 #include <valgrind.h>
  29 #endif
  30
  31 #include "defs.h"
  32 #include <glib.h>
  33 #ifdef ENABLE_NLS
  34 #include <glib/gi18n.h>
  35 #else
  36 #define _(a) (a)
  37 #define N_(a) (a)
  38 #endif
  39 #include <gmodule.h>
  40
  41 #include "utils.h"
  42 #include "plugin.h"
  43 #include "prefs.h"
  44 #include "claws.h"
  45 #include "timing.h"
  46
  47 struct _Plugin
  48 {
  49         gchar   *filename;
  50         GModule *module;
  51         const gchar *(*name) (void);
  52         const gchar *(*desc) (void);
  53         const gchar *(*version) (void);
  54         const gchar *(*type) (void);
  55         const gchar *(*licence) (void);
  56         struct PluginFeature *(*provides) (void);
  57
  58         GSList *rdeps;
  59         gchar *error;
  60         gboolean unloaded_hidden;
  61 };
  62
  63 const gchar *plugin_feature_names[] =
  64         { N_("Nothing"),
  65           N_("a viewer"),
  66           N_("a MIME parser"),
  67           N_("folders"),
  68           N_("filtering"),
  69           N_("a privacy interface"),
  70           N_("a notifier"),
  71           N_("an utility"),
  72           N_("things"),
  73           NULL };
  74
  75 /* The plugin must be at least under one of these licences and have
  76    the corresponding token returned by the plugin_licence function.
  77  */
  78 const gchar const *plugin_licence_tokens[] = {
  79   "LGPL2.1+", "LGPLv2.1+", "LGPL2.1", "LGPLv2.1",
  80   "LGPL3+", "LGPLv3+", "LGPL3", "LGPLv3",
  81   "GPL3+", "GPLv3+", "GPL3", "GPLv3",
  82   "GPL2+", "GPLv2+",
  83   "Apache2.0", "Apache 2.0", "Apache v2.0",
  84   "2-clause BSD", "Simplified BSD", "FreeBSD",
  85   "3-clause BSD", "New BSD", "Modified BSD",
  86   NULL
  87 };
  88
  89 /* Dual (or more) licences are allowed, must be separated by one of these.
  90  */
  91 #define IS_LICENCE_SEP(a) ((a) == ',' || (a) == ';' || (a) == '|' || (a) == '/' || (a) == '\0')
  92
  93 /**
  94  * List of all loaded plugins
  95  */
  96 GSList *plugins = NULL;
  97 GSList *plugin_types = NULL;
  98
  99 /*
 100  * List of plugins unloaded for some fixable reason
 101  */
 102 static GSList *unloaded_plugins = NULL;
 103
 104 static gint list_find_by_string(gconstpointer data, gconstpointer str)
 105 {
 106         return strcmp((gchar *)data, (gchar *)str) ? TRUE : FALSE;
 107 }
 108
 109 static gint list_find_by_plugin_filename(const Plugin *plugin, const gchar *filename)
 110 {
 111         /* FIXME: There is a problem in case of symlinks or when a
 112            user tries to load a plugin with the same name from a
 113            different directory.  I think it would be better to compare
 114            only the basename of the filename here (case-insensitive on
 115            W32). */
 116         cm_return_val_if_fail(plugin, 1);
 117         cm_return_val_if_fail(plugin->filename, 1);
 118         cm_return_val_if_fail(filename, 1);
 119         return strcmp(filename, plugin->filename);
 120 }
 121
 122 void plugin_save_list(void)
 123 {
 124         gchar *rcpath, *block;
 125         PrefFile *pfile;
 126         GSList *type_cur, *plugin_cur;
 127         Plugin *plugin;
 128
 129         for (type_cur = plugin_types; type_cur != NULL; type_cur = g_slist_next(type_cur)) {
 130                 rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 131 #ifdef G_OS_WIN32
 132                 block = g_strconcat("PluginsWin32_", type_cur->data, NULL);
 133 #else
 134                 block = g_strconcat("Plugins_", type_cur->data, NULL);
 135 #endif
 136                 if ((pfile = prefs_write_open(rcpath)) == NULL ||
 137                     (prefs_set_block_label(pfile, block) < 0)) {
 138                         g_warning("failed to write plugin list\n");
 139                         g_free(rcpath);
 140                         return;
 141                 }
 142                 g_free(block);
 143
 144                 for (plugin_cur = plugins; plugin_cur != NULL; plugin_cur = g_slist_next(plugin_cur)) {
 145                         plugin = (Plugin *) plugin_cur->data;
 146
 147                         if (plugin->unloaded_hidden)
 148                                 continue;
 149
 150                         if (!strcmp(plugin->type(), type_cur->data))
 151                                 if (fprintf(pfile->fp, "%s\n", plugin->filename) < 0)
 152                                         goto revert;
 153                 }
 154                 for (plugin_cur = unloaded_plugins; plugin_cur != NULL; plugin_cur = g_slist_next(plugin_cur)) {
 155                         plugin = (Plugin *) plugin_cur->data;
 156
 157                         if (plugin->unloaded_hidden)
 158                                 continue;
 159
 160                         if (!strcmp(plugin->type(), type_cur->data))
 161                                 if (fprintf(pfile->fp, "%s\n", plugin->filename) < 0)
 162                                         goto revert;
 163                 }
 164                 if (fprintf(pfile->fp, "\n") < 0)
 165                         goto revert;
 166
 167                 if (prefs_file_close(pfile) < 0)
 168                         g_warning("failed to write plugin list\n");
 169
 170                 g_free(rcpath);
 171
 172                 continue;
 173
 174 revert:
 175                 g_warning("failed to write plugin list\n");
 176                 if (prefs_file_close_revert(pfile) < 0)
 177                         g_warning("failed to revert plugin list\n");
 178
 179                 g_free(rcpath);
 180         }
 181 }
 182
 183 static gboolean plugin_is_loaded(const gchar *filename)
 184 {
 185         return (g_slist_find_custom(plugins, filename,
 186                   (GCompareFunc)list_find_by_plugin_filename) != NULL);
 187 }
 188
 189 static Plugin *plugin_get_by_filename(const gchar *filename)
 190 {
 191         GSList *cur = plugins;
 192         for(; cur; cur = cur->next) {
 193                 Plugin *p = (Plugin *)cur->data;
 194                 if (!strcmp(p->filename, filename)) {
 195                         return p;
 196                 }
 197         }
 198         return NULL;
 199 }
 200
 201 /**
 202  * Loads a plugin dependancies
 203  *
 204  * Plugin dependancies are, optionnaly, listed in a file in
 205  * get_plugin_dir()/$pluginname.deps.
 206  * \param filename The filename of the plugin for which we have to load deps
 207  * \param error The location where an error string can be stored
 208  * \return 0 on success, -1 otherwise
 209  */
 210 static gint plugin_load_deps(const gchar *filename, gchar **error)
 211 {
 212         gchar *tmp;
 213         gchar *deps_file = NULL;
 214         FILE *fp = NULL;
 215         gchar buf[BUFFSIZE];
 216         gchar *p;
 217
 218         tmp = g_strdup(filename);
 219         if( (p = strrchr(tmp, '.')) )
 220           *p = '\0';
 221         deps_file = g_strconcat(tmp, ".deps", NULL);
 222         g_free(tmp);
 223
 224         fp = g_fopen(deps_file, "rb");
 225         g_free(deps_file);
 226
 227         if (!fp)
 228                 return 0;
 229
 230         while (fgets(buf, sizeof(buf), fp) != NULL) {
 231                 Plugin *dep_plugin = NULL;
 232                 gchar *path = NULL;
 233                 buf[strlen(buf)-1]='\0'; /* chop off \n */
 234                 path = g_strconcat(get_plugin_dir(), buf,
 235                                 ".", G_MODULE_SUFFIX, NULL);
 236                 if ((dep_plugin = plugin_get_by_filename(path)) == NULL) {
 237                         debug_print("trying to load %s\n", path);
 238                         dep_plugin = plugin_load(path, error);
 239                         if (dep_plugin == NULL) {
 240                                 g_free(path);
 241                                 fclose(fp);
 242                                 return -1;
 243                         }
 244                 }
 245                 g_free(path);
 246                 if (!g_slist_find_custom(dep_plugin->rdeps,
 247                                 (gpointer) filename, list_find_by_string)) {
 248                         debug_print("adding %s to %s rdeps\n",
 249                                 filename,
 250                                 dep_plugin->filename);
 251                         dep_plugin->rdeps =
 252                                 g_slist_append(dep_plugin->rdeps,
 253                                         g_strdup(filename));
 254                 }
 255         }
 256         fclose(fp);
 257         return 0;
 258 }
 259
 260 static void plugin_unload_rdeps(Plugin *plugin)
 261 {
 262         GSList *cur = plugin->rdeps;
 263         debug_print("removing %s rdeps\n", plugin->filename);
 264         while (cur) {
 265                 gchar *file = (gchar *)cur->data;
 266                 Plugin *rdep_plugin = file?plugin_get_by_filename(file):NULL;
 267                 debug_print(" rdep %s: %p\n", file, rdep_plugin);
 268                 if (rdep_plugin) {
 269                         plugin_unload(rdep_plugin);
 270                 }
 271                 g_free(file);
 272                 cur = cur->next;
 273         }
 274         g_slist_free(plugin->rdeps);
 275         plugin->rdeps = NULL;
 276 }
 277
 278 static void plugin_remove_from_unloaded_list (const gchar *filename)
 279 {
 280         GSList *item = g_slist_find_custom(unloaded_plugins,
 281                                 (gpointer) filename, (GCompareFunc)list_find_by_plugin_filename);
 282         Plugin *unloaded_plugin = item ? ((Plugin *)item->data):NULL;
 283         if (unloaded_plugin != NULL) {
 284                 debug_print("removing %s from unloaded list\n", unloaded_plugin->filename);
 285                 unloaded_plugins = g_slist_remove(unloaded_plugins, unloaded_plugin);
 286                 g_module_close(unloaded_plugin->module);
 287                 g_free(unloaded_plugin->filename);
 288                 g_free(unloaded_plugin->error);
 289                 g_free(unloaded_plugin);
 290         }
 291 }
 292
 293 static gchar *plugin_check_features(struct PluginFeature *features) {
 294         int i = 0, j = 0;
 295         GSList *cur = plugins;
 296
 297         if (features == NULL)
 298                 return NULL;
 299         for(; cur; cur = cur->next) {
 300                 Plugin *p = (Plugin *)cur->data;
 301                 struct PluginFeature *cur_features = p->provides();
 302                 if (p->unloaded_hidden)
 303                         continue;
 304                 for (j = 0; cur_features[j].type != PLUGIN_NOTHING; j++) {
 305                         for (i = 0; features[i].type != PLUGIN_NOTHING; i++) {
 306                                 if (cur_features[j].type == features[i].type &&
 307                                     !strcmp(cur_features[j].subtype, features[i].subtype)) {
 308                                         return g_strdup_printf(_(
 309                                                 "This plugin provides %s (%s), which is "
 310                                                 "already provided by the %s plugin."),
 311                                                 _(plugin_feature_names[features[i].type]),
 312                                                 _(features[i].subtype),
 313                                                 p->name());
 314                                 }
 315                         }
 316                 }
 317         }
 318
 319         return NULL;
 320 }
 321
 322 static gboolean plugin_licence_check(const gchar *licence) {
 323         gint i = 0;
 324         gint len = 0;
 325
 326         if (licence != NULL) {
 327                 len = strlen(licence);
 328         }
 329         if (len == 0) {
 330                 g_warning("plugin licence check failed: empty licence\n");
 331                 return FALSE;
 332         }
 333         while (plugin_licence_tokens[i] != NULL) {
 334                 gchar *found = g_strstr_len(licence, len, plugin_licence_tokens[i]);
 335                 if (found != NULL) {
 336                         gint tlen = strlen(plugin_licence_tokens[i]);
 337                         if (len != tlen) { /* not a single license */
 338                                 if (((found == licence) &&  (!IS_LICENCE_SEP(licence[tlen])))
 339                                                 || (!IS_LICENCE_SEP(*(found - 1)))
 340                                                 || (!IS_LICENCE_SEP(*(found + tlen)))) {
 341                                         debug_print("plugin licence check failed: invalid separator\n");
 342                                         return FALSE;
 343                                 }
 344                         }
 345                         debug_print("plugin licence check passed: %s found\n", plugin_licence_tokens[i]);
 346                         return TRUE;
 347                 }
 348                 ++i;
 349         }
 350         debug_print("plugin licence check failed: %s is not a valid licence\n", licence);
 351         return FALSE;
 352 }
 353
 354 static gboolean plugin_filename_is_standard_dir(const gchar *filename) {
 355         return strncmp(filename, get_plugin_dir(), strlen(get_plugin_dir())) == 0;
 356 }
 357
 358 static Plugin *plugin_load_in_default_dir(const gchar *filename, gchar **error)
 359 {
 360         Plugin *plugin = NULL;
 361         gchar *filename_default_dir = NULL;
 362         gchar *default_error = NULL;
 363         gchar *plugin_name = g_path_get_basename(filename);
 364
 365         filename_default_dir = g_strconcat(get_plugin_dir(), plugin_name, NULL);
 366
 367         debug_print("trying to load %s in default plugin directory %s\n",
 368                     plugin_name, get_plugin_dir());
 369
 370         g_free(plugin_name);
 371
 372         plugin = plugin_load(filename_default_dir, &default_error);
 373
 374         g_free(filename_default_dir);
 375
 376         if (plugin) {
 377                 g_free(*error);
 378                 *error = NULL;
 379         } else {
 380                 g_free(default_error);
 381         }
 382
 383         return plugin;
 384 }
 385
 386 /**
 387  * Loads a plugin
 388  *
 389  * \param filename The filename of the plugin to load
 390  * \param error The location where an error string can be stored
 391  * \return the plugin on success, NULL otherwise
 392  */
 393 Plugin *plugin_load(const gchar *filename, gchar **error)
 394 {
 395         Plugin *plugin;
 396         gint (*plugin_init) (gchar **error);
 397         gpointer plugin_name, plugin_desc, plugin_version;
 398         const gchar *(*plugin_type)(void);
 399         const gchar *(*plugin_licence)(void);
 400         struct PluginFeature *(*plugin_provides)(void);
 401         gint ok;
 402         START_TIMING((filename?filename:"NULL plugin"));
 403         cm_return_val_if_fail(filename != NULL, NULL);
 404         cm_return_val_if_fail(error != NULL, NULL);
 405
 406         /* check duplicate plugin path name */
 407         if (plugin_is_loaded(filename)) {
 408                 plugin = plugin_get_by_filename(filename);
 409                 if (plugin->unloaded_hidden) {
 410                         /* reshow it */
 411                         goto init_plugin;
 412                 } else {
 413                         *error = g_strdup(_("Plugin already loaded"));
 414                         return NULL;
 415                 }
 416         }
 417
 418         plugin_remove_from_unloaded_list(filename);
 419
 420         if (plugin_load_deps(filename, error) < 0)
 421                 return NULL;
 422         plugin = g_new0(Plugin, 1);
 423         if (plugin == NULL) {
 424                 *error = g_strdup(_("Failed to allocate memory for Plugin"));
 425                 return NULL;
 426         }
 427
 428         debug_print("trying to load `%s'\n", filename);
 429         plugin->module = g_module_open(filename, 0);
 430         if (plugin->module == NULL) {
 431                 *error = g_strdup(g_module_error());
 432                 g_free(plugin);
 433                 if (!plugin_filename_is_standard_dir(filename))
 434                         return plugin_load_in_default_dir(filename, error);
 435                 else
 436                         return NULL;
 437         }
 438
 439 init_plugin:
 440         if (!g_module_symbol(plugin->module, "plugin_name", &plugin_name) ||
 441             !g_module_symbol(plugin->module, "plugin_desc", &plugin_desc) ||
 442             !g_module_symbol(plugin->module, "plugin_version", &plugin_version) ||
 443             !g_module_symbol(plugin->module, "plugin_type", (gpointer)&plugin_type) ||
 444             !g_module_symbol(plugin->module, "plugin_licence", (gpointer)&plugin_licence) ||
 445             !g_module_symbol(plugin->module, "plugin_provides", (gpointer)&plugin_provides) ||
 446             !g_module_symbol(plugin->module, "plugin_init", (gpointer)&plugin_init)) {
 447                 *error = g_strdup(g_module_error());
 448                 if (plugin->unloaded_hidden)
 449                         return NULL;
 450                 g_module_close(plugin->module);
 451                 g_free(plugin);
 452                 return NULL;
 453         }
 454
 455         if (plugin_licence_check(plugin_licence()) != TRUE) {
 456                 *error = g_strdup(_("This module is not licensed under a GPL v3 or later compatible license."));
 457                 if (plugin->unloaded_hidden)
 458                         return NULL;
 459                 g_module_close(plugin->module);
 460                 g_free(plugin);
 461                 return NULL;
 462         }
 463
 464         if (!strcmp(plugin_type(), "GTK")) {
 465                 *error = g_strdup(_("This module is for Claws Mail GTK1."));
 466                 if (plugin->unloaded_hidden)
 467                         return NULL;
 468                 g_module_close(plugin->module);
 469                 g_free(plugin);
 470                 return NULL;
 471         }
 472
 473         if ((*error = plugin_check_features(plugin_provides())) != NULL) {
 474                 if (plugin->unloaded_hidden)
 475                         return NULL;
 476                 g_module_close(plugin->module);
 477                 g_free(plugin);
 478                 return NULL;
 479         }
 480         plugin->name = plugin_name;
 481         plugin->desc = plugin_desc;
 482         plugin->version = plugin_version;
 483         plugin->type = plugin_type;
 484         plugin->licence = plugin_licence;
 485         plugin->provides = plugin_provides;
 486         plugin->filename = g_strdup(filename);
 487         plugin->error = NULL;
 488
 489         if ((ok = plugin_init(error)) < 0) {
 490                 if (*error)
 491                         plugin->error = g_strdup(*error);
 492                 unloaded_plugins = g_slist_append(unloaded_plugins, plugin);
 493                 return NULL;
 494         }
 495
 496         if (!plugin->unloaded_hidden)
 497                 plugins = g_slist_append(plugins, plugin);
 498         plugin->unloaded_hidden = FALSE;
 499
 500         debug_print("Plugin %s (from file %s) loaded\n", plugin->name(), filename);
 501         END_TIMING();
 502         return plugin;
 503 }
 504
 505 void plugin_unload(Plugin *plugin)
 506 {
 507         gboolean (*plugin_done) (void);
 508         gboolean can_unload = TRUE;
 509
 510         plugin_unload_rdeps(plugin);
 511
 512         if (plugin->unloaded_hidden)
 513                 return;
 514
 515         if (plugin->error) {
 516                 plugin_remove_from_unloaded_list(plugin->filename);
 517                 return;
 518         }
 519         if (g_module_symbol(plugin->module, "plugin_done", (gpointer) &plugin_done)) {
 520                 can_unload = plugin_done();
 521         }
 522
 523         if (can_unload) {
 524 #ifdef HAVE_VALGRIND
 525                 if (!RUNNING_ON_VALGRIND) {
 526                         g_module_close(plugin->module);
 527                 }
 528 #else
 529                 g_module_close(plugin->module);
 530 #endif
 531                 plugins = g_slist_remove(plugins, plugin);
 532                 g_free(plugin->filename);
 533                 g_free(plugin);
 534         } else {
 535                 plugin->unloaded_hidden = TRUE;
 536         }
 537
 538 }
 539
 540 void plugin_load_all(const gchar *type)
 541 {
 542         gchar *rcpath;
 543         gchar buf[BUFFSIZE];
 544         PrefFile *pfile;
 545         gchar *error = NULL, *block;
 546
 547         plugin_types = g_slist_append(plugin_types, g_strdup(type));
 548
 549         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 550 #ifdef G_OS_WIN32
 551         block = g_strconcat("PluginsWin32_", type, NULL);
 552 #else
 553         block = g_strconcat("Plugins_", type, NULL);
 554 #endif
 555         if ((pfile = prefs_read_open(rcpath)) == NULL ||
 556             (prefs_set_block_label(pfile, block) < 0)) {
 557                 g_free(rcpath);
 558                 if (pfile)
 559                         prefs_file_close(pfile);
 560                 return;
 561         }
 562         g_free(block);
 563
 564         while (fgets(buf, sizeof(buf), pfile->fp) != NULL) {
 565                 if (buf[0] == '[')
 566                         break;
 567
 568                 g_strstrip(buf);
 569                 if ((buf[0] != '\0') && (plugin_load(buf, &error) == NULL)) {
 570                         g_warning("plugin loading error: %s\n", error);
 571                         g_free(error);
 572                 }
 573         }
 574         prefs_file_close(pfile);
 575
 576         g_free(rcpath);
 577 }
 578
 579 void plugin_unload_all(const gchar *type)
 580 {
 581         GSList *list, *cur;
 582
 583         list = g_slist_copy(plugins);
 584         list = g_slist_reverse(list);
 585
 586         for(cur = list; cur != NULL; cur = g_slist_next(cur)) {
 587                 Plugin *plugin = (Plugin *) cur->data;
 588
 589                 if (!strcmp(type, plugin->type()))
 590                         plugin_unload(plugin);
 591         }
 592         g_slist_free(list);
 593
 594         cur = g_slist_find_custom(plugin_types, (gpointer) type, list_find_by_string);
 595         if (cur) {
 596                 g_free(cur->data);
 597                 plugin_types = g_slist_remove(plugin_types, cur);
 598         }
 599 }
 600
 601
 602 /* Load those plugins we always want to use.  No error output; just
 603  * try. */
 604 void plugin_load_standard_plugins (void)
 605 {
 606         static const char *names[] = {
 607 #ifdef G_OS_WIN32
 608                 "pgpmime",
 609                 "pgpinline",
 610 #else
 611                 /* post-2.5 maybe
 612                 "bogofilter", */
 613 #endif
 614                 NULL
 615         };
 616         int i;
 617         gchar *error, *filename;
 618
 619         for (i=0; names[i]; i++) {
 620                 /* Simple hack to check whether the plugin has already
 621                  * been loaded but checking only for the basename. */
 622                 GSList *cur = plugins;
 623                 for(; cur; cur = cur->next) {
 624                         Plugin *p = (Plugin *)cur->data;
 625                         if (strstr(p->filename, names[i]))
 626                                 break;
 627                 }
 628                 if (!cur) { /* Not yet loaded. */
 629                         /* FIXME: get_plugin_dir () returns with a trailing
 630                          * (back)slash; this should be fixed so that we can use
 631                          * g_module_build_path here. */
 632 #ifdef G_OS_WIN32
 633                         filename = g_strconcat (get_plugin_dir(),
 634                                                 names[i], NULL);
 635 #else
 636                         filename = g_strconcat (get_plugin_dir(),
 637                                                 names[i], ".", G_MODULE_SUFFIX, NULL);
 638 #endif
 639                         error = NULL;
 640                         plugin_load(filename, &error);
 641                         g_free (error);
 642                         g_free(filename);
 643                 }
 644         }
 645 }
 646
 647 GSList *plugin_get_list(void)
 648 {
 649         GSList *new = NULL;
 650         GSList *cur = plugins;
 651         for (; cur; cur = cur->next) {
 652                 Plugin *p = (Plugin *)cur->data;
 653                 if (!p->unloaded_hidden)
 654                         new = g_slist_prepend(new, p);
 655         }
 656         new = g_slist_reverse(new);
 657         return new;
 658 }
 659
 660 Plugin *plugin_get_loaded_by_name(const gchar *name)
 661 {
 662         Plugin *plugin = NULL;
 663         GSList *new, *cur;
 664         new = plugin_get_list();
 665         for (cur = new; cur; cur = g_slist_next(cur)) {
 666                 plugin = (Plugin *)cur->data;
 667                 if (!g_ascii_strcasecmp(plugin->name(), name))
 668                         break;
 669                 else
 670                         plugin = NULL;
 671         }
 672         g_slist_free(new);
 673         return plugin;
 674 }
 675
 676 GSList *plugin_get_unloaded_list(void)
 677 {
 678         return g_slist_copy(unloaded_plugins);
 679 }
 680
 681 const gchar *plugin_get_name(Plugin *plugin)
 682 {
 683         return plugin->name();
 684 }
 685
 686 const gchar *plugin_get_desc(Plugin *plugin)
 687 {
 688         return plugin->desc();
 689 }
 690
 691 const gchar *plugin_get_version(Plugin *plugin)
 692 {
 693         return plugin->version();
 694 }
 695
 696 const gchar *plugin_get_error(Plugin *plugin)
 697 {
 698         return plugin->error;
 699 }
 700
 701 /* Generally called in plugin_init() function of each plugin. It check the
 702  * minimal and compiled version of claws binary required by the plugin.
 703  * If (@minimum_claws_version == 0 || @compiled_claws_version == 0), don't
 704  * check the corresponding version.
 705  *
 706  * If an error occurs {
 707  *      If @error == NULL { don't allocate error string. }
 708  *      If @error != NULL { error string is allocated and must be freed after
 709  *                              call function. }
 710  * }
 711  * Returns: FALSE if an error occurs, TRUE if all is OK.
 712  */
 713 gint check_plugin_version(guint32 minimum_claws_version,
 714                          guint32 compiled_claws_version,
 715                          const gchar *plugin_name,
 716                          gchar **error)
 717 {
 718         guint32 claws_version = claws_get_version();
 719
 720         if (compiled_claws_version != 0 && claws_version > compiled_claws_version) {
 721                 if (error != NULL) {
 722                         *error = (plugin_name && *plugin_name)
 723                                 ? g_strdup_printf(_("Your version of Claws Mail is newer than the "
 724                                                         "version the '%s' plugin was built with."),
 725                                                 plugin_name)
 726                                 : g_strdup(_("Your version of Claws Mail is newer than the "
 727                                                         "version the plugin was built with."));
 728                 }
 729                 return FALSE;
 730         }
 731
 732         if (minimum_claws_version != 0 && claws_version < minimum_claws_version) {
 733                 if (error != NULL) {
 734                         *error = (plugin_name && *plugin_name)
 735                                 ? g_strdup_printf(_("Your version of Claws Mail is too old for "
 736                                                         "the '%s' plugin."), plugin_name)
 737                                 : g_strdup(_("Your version of Claws Mail is too old for the plugin."));
 738                 }
 739                 return FALSE;
 740         }
 741         return TRUE;
 742 }