src/plugins/spamassassin/spamassassin.c

   1 /*
   2  * Claws Mail -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 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 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include "defs.h"
  26
  27 #include <sys/types.h>
  28 #include <sys/wait.h>
  29
  30 #include <glib.h>
  31 #include <glib/gi18n.h>
  32
  33 #if HAVE_LOCALE_H
  34 #  include <locale.h>
  35 #endif
  36
  37 #include "common/claws.h"
  38 #include "common/version.h"
  39 #include "plugin.h"
  40 #include "common/utils.h"
  41 #include "hooks.h"
  42 #include "procmsg.h"
  43 #include "folder.h"
  44 #include "prefs.h"
  45 #include "prefs_gtk.h"
  46
  47 #include "libspamc.h"
  48 #include "spamassassin.h"
  49 #include "inc.h"
  50 #include "log.h"
  51 #include "prefs_common.h"
  52 #include "alertpanel.h"
  53 #include "addr_compl.h"
  54
  55 #ifdef HAVE_SYSEXITS_H
  56 #include <sysexits.h>
  57 #endif
  58 #ifdef HAVE_ERRNO_H
  59 #include <errno.h>
  60 #endif
  61 #ifdef HAVE_SYS_ERRNO_H
  62 #include <sys/errno.h>
  63 #endif
  64 #ifdef HAVE_TIME_H
  65 #include <time.h>
  66 #endif
  67 #ifdef HAVE_SYS_TIME_H
  68 #include <sys/time.h>
  69 #endif
  70 #ifdef HAVE_SIGNAL_H
  71 #include <signal.h>
  72 #endif
  73 #ifdef HAVE_PWD_H
  74 #include <pwd.h>
  75 #endif
  76
  77 #define PLUGIN_NAME (_("SpamAssassin"))
  78
  79 enum {
  80     CHILD_RUNNING = 1 << 0,
  81     TIMEOUT_RUNNING = 1 << 1,
  82 };
  83
  84 static guint hook_id = -1;
  85 static int flags = SPAMC_RAW_MODE | SPAMC_SAFE_FALLBACK | SPAMC_CHECK_ONLY;
  86 static MessageCallback message_callback;
  87
  88 static SpamAssassinConfig config;
  89
  90 static PrefParam param[] = {
  91         {"enable", "FALSE", &config.enable, P_BOOL,
  92         NULL, NULL, NULL},
  93         {"transport", "0", &config.transport, P_INT,
  94          NULL, NULL, NULL},
  95         {"hostname", "localhost", &config.hostname, P_STRING,
  96          NULL, NULL, NULL},
  97         {"port", "783", &config.port, P_INT,
  98          NULL, NULL, NULL},
  99         {"socket", "", &config.socket, P_STRING,
 100          NULL, NULL, NULL},
 101         {"process_emails", "TRUE", &config.process_emails, P_BOOL,
 102          NULL, NULL, NULL},
 103         {"receive_spam", "TRUE", &config.receive_spam, P_BOOL,
 104          NULL, NULL, NULL},
 105         {"save_folder", NULL, &config.save_folder, P_STRING,
 106          NULL, NULL, NULL},
 107         {"max_size", "250", &config.max_size, P_INT,
 108          NULL, NULL, NULL},
 109         {"timeout", "30", &config.timeout, P_INT,
 110          NULL, NULL, NULL},
 111         {"username", "", &config.username, P_STRING,
 112          NULL, NULL, NULL},
 113         {"mark_as_read", "TRUE", &config.mark_as_read, P_BOOL,
 114          NULL, NULL, NULL},
 115         {"whitelist_ab", "FALSE", &config.whitelist_ab, P_BOOL,
 116          NULL, NULL, NULL},
 117         {"whitelist_ab_folder", N_("Any"), &config.whitelist_ab_folder, P_STRING,
 118          NULL, NULL, NULL},
 119
 120         {NULL, NULL, NULL, P_OTHER, NULL, NULL, NULL}
 121 };
 122
 123 gboolean timeout_func(gpointer data)
 124 {
 125         gint *running = (gint *) data;
 126
 127         if (*running & CHILD_RUNNING)
 128                 return TRUE;
 129
 130         *running &= ~TIMEOUT_RUNNING;
 131         return FALSE;
 132 }
 133
 134 typedef enum {
 135         MSG_IS_HAM = 0,
 136         MSG_IS_SPAM = 1,
 137         MSG_FILTERING_ERROR = 2
 138 } MsgStatus;
 139
 140 static MsgStatus msg_is_spam(FILE *fp)
 141 {
 142         struct transport trans;
 143         struct message m;
 144         gboolean is_spam = FALSE;
 145
 146         if (!config.enable)
 147                 return MSG_IS_HAM;
 148
 149         transport_init(&trans);
 150         switch (config.transport) {
 151         case SPAMASSASSIN_TRANSPORT_LOCALHOST:
 152                 trans.type = TRANSPORT_LOCALHOST;
 153                 trans.port = config.port;
 154                 break;
 155         case SPAMASSASSIN_TRANSPORT_TCP:
 156                 trans.type = TRANSPORT_TCP;
 157                 trans.hostname = config.hostname;
 158                 trans.port = config.port;
 159                 break;
 160         case SPAMASSASSIN_TRANSPORT_UNIX:
 161                 trans.type = TRANSPORT_UNIX;
 162                 trans.socketpath = config.socket;
 163                 break;
 164         default:
 165                 return MSG_IS_HAM;
 166         }
 167
 168         if (transport_setup(&trans, flags) != EX_OK) {
 169                 log_error(LOG_PROTOCOL, _("SpamAssassin plugin couldn't connect to spamd.\n"));
 170                 debug_print("failed to setup transport\n");
 171                 return MSG_FILTERING_ERROR;
 172         }
 173
 174         m.type = MESSAGE_NONE;
 175         m.max_len = config.max_size * 1024;
 176         m.timeout = config.timeout;
 177
 178         if (message_read(fileno(fp), flags, &m) != EX_OK) {
 179                 debug_print("failed to read message\n");
 180                 message_cleanup(&m);
 181                 return MSG_FILTERING_ERROR;
 182         }
 183
 184         if (message_filter(&trans, config.username, flags, &m) != EX_OK) {
 185                 log_error(LOG_PROTOCOL, _("SpamAssassin plugin filtering failed.\n"));
 186                 debug_print("filtering the message failed\n");
 187                 message_cleanup(&m);
 188                 return MSG_FILTERING_ERROR;
 189         }
 190
 191         if (m.is_spam == EX_ISSPAM)
 192                 is_spam = TRUE;
 193
 194         message_cleanup(&m);
 195
 196         return is_spam ? MSG_IS_SPAM:MSG_IS_HAM;
 197 }
 198
 199 static gboolean sa_found_in_addressbook(const gchar *address)
 200 {
 201         gchar *addr = NULL;
 202         gboolean found = FALSE;
 203         gint num_addr = 0;
 204
 205         if (!address)
 206                 return FALSE;
 207
 208         addr = g_strdup(address);
 209         extract_address(addr);
 210         num_addr = complete_address(addr);
 211         if (num_addr > 1) {
 212                 /* skip first item (this is the search string itself) */
 213                 int i = 1;
 214                 for (; i < num_addr && !found; i++) {
 215                         gchar *caddr = get_complete_address(i);
 216                         extract_address(caddr);
 217                         if (strcasecmp(caddr, addr) == 0)
 218                                 found = TRUE;
 219                         g_free(caddr);
 220                 }
 221         }
 222         g_free(addr);
 223         return found;
 224 }
 225
 226 static gboolean mail_filtering_hook(gpointer source, gpointer data)
 227 {
 228         MailFilteringData *mail_filtering_data = (MailFilteringData *) source;
 229         MsgInfo *msginfo = mail_filtering_data->msginfo;
 230         gboolean is_spam = FALSE, error = FALSE;
 231         static gboolean warned_error = FALSE;
 232         FILE *fp = NULL;
 233         int pid = 0;
 234         int status;
 235
 236         /* SPAMASSASSIN_DISABLED : keep test for compatibility purpose */
 237         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 238                 log_warning(LOG_PROTOCOL, _("SpamAssassin plugin is disabled by its preferences.\n"));
 239                 return FALSE;
 240         }
 241         debug_print("Filtering message %d\n", msginfo->msgnum);
 242         if (message_callback != NULL)
 243                 message_callback(_("SpamAssassin: filtering message..."));
 244
 245         if ((fp = procmsg_open_message(msginfo)) == NULL) {
 246                 debug_print("failed to open message file\n");
 247                 return FALSE;
 248         }
 249
 250         if (config.whitelist_ab) {
 251                 gchar *ab_folderpath;
 252                 gboolean whitelisted = FALSE;
 253
 254                 if (*config.whitelist_ab_folder == '\0' ||
 255                         strcasecmp(config.whitelist_ab_folder, "Any") == 0) {
 256                         /* match the whole addressbook */
 257                         ab_folderpath = NULL;
 258                 } else {
 259                         /* match the specific book/folder of the addressbook */
 260                         ab_folderpath = config.whitelist_ab_folder;
 261                 }
 262
 263                 start_address_completion(ab_folderpath);
 264                 if (msginfo->from &&
 265                     sa_found_in_addressbook(msginfo->from))
 266                                 whitelisted = TRUE;
 267                 end_address_completion();
 268
 269                 if (whitelisted) {
 270                         debug_print("message is ham (whitelisted)\n");
 271                         fclose(fp);
 272                         return FALSE;
 273                 }
 274         }
 275         pid = fork();
 276         if (pid == 0) {
 277                 _exit(msg_is_spam(fp));
 278         } else {
 279                 gint running = 0;
 280
 281                 running |= CHILD_RUNNING;
 282
 283                 g_timeout_add(50, timeout_func, &running);
 284                 running |= TIMEOUT_RUNNING;
 285
 286                 while(running & CHILD_RUNNING) {
 287                         int ret;
 288
 289                         ret = waitpid(pid, &status, WNOHANG);
 290                         if (ret == pid) {
 291                                 if (WIFEXITED(status)) {
 292                                         MsgStatus result = MSG_IS_HAM;
 293                                         running &= ~CHILD_RUNNING;
 294                                         result = WEXITSTATUS(status);
 295                                         is_spam = (result == MSG_IS_SPAM) ? TRUE : FALSE;
 296                                         error = (result == MSG_FILTERING_ERROR);
 297                                 }
 298                         } if (ret < 0) {
 299                                 running &= ~CHILD_RUNNING;
 300                         } /* ret == 0 continue */
 301
 302                         g_main_context_iteration(NULL, TRUE);
 303                 }
 304
 305                 while (running & TIMEOUT_RUNNING)
 306                         g_main_context_iteration(NULL, TRUE);
 307         }
 308
 309         fclose(fp);
 310
 311         if (is_spam) {
 312                 debug_print("message is spam\n");
 313                 procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 314                 if (config.receive_spam) {
 315                         FolderItem *save_folder = NULL;
 316
 317                         if ((!config.save_folder) ||
 318                             (config.save_folder[0] == '\0') ||
 319                             ((save_folder = folder_find_item_from_identifier(config.save_folder)) == NULL)) {
 320                                 if (mail_filtering_data->account && mail_filtering_data->account->set_trash_folder) {
 321                                         save_folder = folder_find_item_from_identifier(
 322                                                 mail_filtering_data->account->trash_folder);
 323                                         if (save_folder)
 324                                                 debug_print("found trash folder from account's advanced settings\n");
 325                                 }
 326                                 if (save_folder == NULL && mail_filtering_data->account &&
 327                                     mail_filtering_data->account->folder) {
 328                                         save_folder = mail_filtering_data->account->folder->trash;
 329                                         if (save_folder)
 330                                                 debug_print("found trash folder from account's trash\n");
 331                                 }
 332                                 if (save_folder == NULL && mail_filtering_data->account &&
 333                                     !mail_filtering_data->account->folder)  {
 334                                         if (mail_filtering_data->account->inbox) {
 335                                                 FolderItem *item = folder_find_item_from_identifier(
 336                                                         mail_filtering_data->account->inbox);
 337                                                 if (item && item->folder->trash) {
 338                                                         save_folder = item->folder->trash;
 339                                                         debug_print("found trash folder from account's inbox\n");
 340                                                 }
 341                                         }
 342                                         if (!save_folder && mail_filtering_data->account->local_inbox) {
 343                                                 FolderItem *item = folder_find_item_from_identifier(
 344                                                         mail_filtering_data->account->local_inbox);
 345                                                 if (item && item->folder->trash) {
 346                                                         save_folder = item->folder->trash;
 347                                                         debug_print("found trash folder from account's local_inbox\n");
 348                                                 }
 349                                         }
 350                                 }
 351                                 if (save_folder == NULL) {
 352                                         debug_print("using default trash folder\n");
 353                                         save_folder = folder_get_default_trash();
 354                                 }
 355                         }
 356                         if (config.mark_as_read)
 357                                 procmsg_msginfo_unset_flags(msginfo, ~0, 0);
 358                         procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 359                         msginfo->filter_op = IS_MOVE;
 360                         msginfo->to_filter_folder = save_folder;
 361                 } else {
 362                         folder_item_remove_msg(msginfo->folder, msginfo->msgnum);
 363                 }
 364
 365                 return TRUE;
 366         } else {
 367                 debug_print("message is ham\n");
 368                 procmsg_msginfo_unset_flags(msginfo, MSG_SPAM, 0);
 369         }
 370
 371         if (error) {
 372                 gchar *msg = _("The SpamAssassin plugin couldn't filter "
 373                                            "a message. The probable cause of the error "
 374                                            "is an unreachable spamd daemon. Please make "
 375                                            "sure spamd is running and accessible.");
 376                 if (!prefs_common.no_recv_err_panel) {
 377                         if (!warned_error) {
 378                                 alertpanel_error("%s", msg);
 379                         }
 380                         warned_error = TRUE;
 381                 } else {
 382                         log_error(LOG_PROTOCOL, "%s\n", msg);
 383                 }
 384         }
 385
 386         return FALSE;
 387 }
 388
 389 SpamAssassinConfig *spamassassin_get_config(void)
 390 {
 391         return &config;
 392 }
 393
 394 gchar* spamassassin_create_tmp_spamc_wrapper(gboolean spam)
 395 {
 396         gchar *contents;
 397         gchar *fname = get_tmp_file();
 398
 399         if (fname != NULL) {
 400                 contents = g_strdup_printf(
 401                                                 "spamc -d %s -p %u -u %s -t %u -s %u -L %s<\"$*\";exit $?",
 402                                                 config.hostname, config.port,
 403                                                 config.username, config.timeout,
 404                                                 config.max_size * 1024, spam?"spam":"ham");
 405                 if (str_write_to_file(contents, fname) < 0) {
 406                         g_free(fname);
 407                         fname = NULL;
 408                 }
 409                 g_free(contents);
 410         }
 411         /* returned pointer must be free'ed by caller */
 412         return fname;
 413 }
 414
 415 int spamassassin_learn(MsgInfo *msginfo, GSList *msglist, gboolean spam)
 416 {
 417         gchar *cmd = NULL;
 418         gchar *file = NULL;
 419         const gchar *shell = g_getenv("SHELL");
 420         gchar *spamc_wrapper = NULL;
 421
 422         if (msginfo == NULL && msglist == NULL) {
 423                 return -1;
 424         }
 425
 426         if (config.transport == SPAMASSASSIN_TRANSPORT_TCP
 427         &&  prefs_common.work_offline
 428         &&  !inc_offline_should_override(TRUE,
 429                 _("Claws Mail needs network access in order "
 430                   "to feed this mail(s) to the remote learner."))) {
 431                 return -1;
 432         }
 433
 434         if (msginfo) {
 435                 file = procmsg_get_message_file(msginfo);
 436                 if (file == NULL) {
 437                         return -1;
 438                 }
 439                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 440                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 441                         if (spamc_wrapper != NULL) {
 442                                 cmd = g_strconcat(shell?shell:"sh", " ",
 443                                                                 spamc_wrapper, " ", file, NULL);
 444                         }
 445                 } else {
 446                         cmd = g_strdup_printf("sa-learn -u %s%s %s %s",
 447                                                         config.username,
 448                                                         prefs_common.work_offline?" -L":"",
 449                                                         spam?"--spam":"--ham", file);
 450                 }
 451         }
 452         if (msglist) {
 453                 GSList *cur = msglist;
 454                 MsgInfo *info;
 455
 456                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 457                         /* execute n-times the spamc command */
 458                         for (; cur; cur = cur->next) {
 459                                 info = (MsgInfo *)cur->data;
 460                                 gchar *tmpcmd = NULL;
 461                                 gchar *tmpfile = get_tmp_file();
 462
 463                                 if (spamc_wrapper == NULL) {
 464                                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 465                                 }
 466
 467                                 if (spamc_wrapper && tmpfile &&
 468                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 469                                         tmpcmd = g_strconcat(shell?shell:"sh", " ", spamc_wrapper, " ",
 470                                                                                 tmpfile, NULL);
 471                                         debug_print("%s\n", tmpcmd);
 472                                         execute_command_line(tmpcmd, FALSE);
 473                                         g_free(tmpcmd);
 474                                 }
 475                                 g_free(tmpfile);
 476                         }
 477                         g_free(spamc_wrapper);
 478                         return 0;
 479                 } else {
 480                         cmd = g_strdup_printf("sa-learn -u %s%s %s",
 481                                         config.username,
 482                                         prefs_common.work_offline?" -L":"",
 483                                         spam?"--spam":"--ham");
 484
 485                         /* concatenate all message tmpfiles to the sa-learn command-line */
 486                         for (; cur; cur = cur->next) {
 487                                 info = (MsgInfo *)cur->data;
 488                                 gchar *tmpcmd = NULL;
 489                                 gchar *tmpfile = get_tmp_file();
 490
 491                                 if (tmpfile &&
 492                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 493                                         tmpcmd = g_strconcat(cmd, " ", tmpfile, NULL);
 494                                         g_free(cmd);
 495                                         cmd = tmpcmd;
 496                                 }
 497                                 g_free(tmpfile);
 498                         }
 499                 }
 500         }
 501         if (cmd == NULL) {
 502                 return -1;
 503         }
 504         debug_print("%s\n", cmd);
 505         /* only run sync calls to sa-learn/spamc to prevent system lockdown */
 506         execute_command_line(cmd, FALSE);
 507         g_free(cmd);
 508         g_free(spamc_wrapper);
 509
 510         return 0;
 511 }
 512
 513 void spamassassin_save_config(void)
 514 {
 515         PrefFile *pfile;
 516         gchar *rcpath;
 517
 518         debug_print("Saving SpamAssassin Page\n");
 519
 520         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 521         pfile = prefs_write_open(rcpath);
 522         g_free(rcpath);
 523         if (!pfile || (prefs_set_block_label(pfile, "SpamAssassin") < 0))
 524                 return;
 525
 526         if (prefs_write_param(param, pfile->fp) < 0) {
 527                 g_warning("Failed to write SpamAssassin configuration to file\n");
 528                 prefs_file_close_revert(pfile);
 529                 return;
 530         }
 531         if (fprintf(pfile->fp, "\n") < 0) {
 532                 FILE_OP_ERROR(rcpath, "fprintf");
 533                 prefs_file_close_revert(pfile);
 534         } else
 535                 prefs_file_close(pfile);
 536 }
 537
 538 gboolean spamassassin_check_username(void)
 539 {
 540         if (config.username == NULL || config.username[0] == '\0') {
 541                 config.username = (gchar*)g_get_user_name();
 542                 if (config.username == NULL) {
 543                         if (hook_id != -1) {
 544                                 spamassassin_unregister_hook();
 545                         }
 546                         procmsg_unregister_spam_learner(spamassassin_learn);
 547                         procmsg_spam_set_folder(NULL, NULL);
 548                         return FALSE;
 549                 }
 550         }
 551         return TRUE;
 552 }
 553
 554 void spamassassin_set_message_callback(MessageCallback callback)
 555 {
 556         message_callback = callback;
 557 }
 558
 559 gint plugin_init(gchar **error)
 560 {
 561         gchar *rcpath;
 562
 563         hook_id = -1;
 564
 565         if (!check_plugin_version(MAKE_NUMERIC_VERSION(2,9,2,72),
 566                                 VERSION_NUMERIC, PLUGIN_NAME, error))
 567                 return -1;
 568
 569         prefs_set_default(param);
 570         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 571         prefs_read_config(param, "SpamAssassin", rcpath, NULL);
 572         g_free(rcpath);
 573         if (!spamassassin_check_username()) {
 574                 *error = g_strdup(_("Failed to get username"));
 575                 return -1;
 576         }
 577         spamassassin_gtk_init();
 578
 579         debug_print("SpamAssassin plugin loaded\n");
 580
 581         if (config.process_emails) {
 582                 spamassassin_register_hook();
 583         }
 584
 585         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 586                 log_warning(LOG_PROTOCOL, _("SpamAssassin plugin is loaded but disabled by its preferences.\n"));
 587         }
 588         else {
 589                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP)
 590                         debug_print("Enabling learner with a remote spamassassin server requires spamc/spamd 3.1.x\n");
 591                 procmsg_register_spam_learner(spamassassin_learn);
 592                 procmsg_spam_set_folder(config.save_folder, spamassassin_get_spam_folder);
 593         }
 594
 595         return 0;
 596
 597 }
 598
 599 gboolean plugin_done(void)
 600 {
 601         if (hook_id != -1) {
 602                 spamassassin_unregister_hook();
 603         }
 604         g_free(config.hostname);
 605         g_free(config.save_folder);
 606         spamassassin_gtk_done();
 607         procmsg_unregister_spam_learner(spamassassin_learn);
 608         procmsg_spam_set_folder(NULL, NULL);
 609         debug_print("SpamAssassin plugin unloaded\n");
 610         return TRUE;
 611 }
 612
 613 const gchar *plugin_name(void)
 614 {
 615         return PLUGIN_NAME;
 616 }
 617
 618 const gchar *plugin_desc(void)
 619 {
 620         return _("This plugin can check all messages that are received from an "
 621                  "IMAP, LOCAL or POP account for spam using a SpamAssassin "
 622                  "server. You will need a SpamAssassin Server (spamd) running "
 623                  "somewhere.\n"
 624                  "\n"
 625                  "It can also be used for marking messages as Ham or Spam.\n"
 626                  "\n"
 627                  "When a message is identified as spam it can be deleted or "
 628                  "saved in a specially designated folder.\n"
 629                  "\n"
 630                  "Options can be found in /Configuration/Preferences/Plugins/SpamAssassin");
 631 }
 632
 633 const gchar *plugin_type(void)
 634 {
 635         return "GTK2";
 636 }
 637
 638 const gchar *plugin_licence(void)
 639 {
 640         return "GPL3+";
 641 }
 642
 643 const gchar *plugin_version(void)
 644 {
 645         return VERSION;
 646 }
 647
 648 struct PluginFeature *plugin_provides(void)
 649 {
 650         static struct PluginFeature features[] =
 651                 { {PLUGIN_FILTERING, N_("Spam detection")},
 652                   {PLUGIN_FILTERING, N_("Spam learning")},
 653                   {PLUGIN_NOTHING, NULL}};
 654         return features;
 655 }
 656
 657 void spamassassin_register_hook(void)
 658 {
 659         if (hook_id == -1)
 660                 hook_id = hooks_register_hook(MAIL_FILTERING_HOOKLIST, mail_filtering_hook, NULL);
 661         if (hook_id == -1) {
 662                 g_warning("Failed to register mail filtering hook");
 663                 config.process_emails = FALSE;
 664         }
 665 }
 666
 667 void spamassassin_unregister_hook(void)
 668 {
 669         if (hook_id != -1) {
 670                 hooks_unregister_hook(MAIL_FILTERING_HOOKLIST, hook_id);
 671         }
 672         hook_id = -1;
 673 }
 674
 675 FolderItem *spamassassin_get_spam_folder(MsgInfo *msginfo)
 676 {
 677         FolderItem *item = folder_find_item_from_identifier(config.save_folder);
 678
 679         if (item || msginfo == NULL || msginfo->folder == NULL)
 680                 return item;
 681
 682         if (msginfo->folder->folder &&
 683             msginfo->folder->folder->account &&
 684             msginfo->folder->folder->account->set_trash_folder) {
 685                 item = folder_find_item_from_identifier(
 686                         msginfo->folder->folder->account->trash_folder);
 687         }
 688
 689         if (item == NULL &&
 690             msginfo->folder->folder &&
 691             msginfo->folder->folder->trash)
 692                 item = msginfo->folder->folder->trash;
 693
 694         if (item == NULL)
 695                 item = folder_get_default_trash();
 696
 697         debug_print("SA spam dir: %s\n", folder_item_get_path(item));
 698         return item;
 699 }
 700