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 gulong hook_id = HOOK_NONE;
  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 mail_filtering_hook(gpointer source, gpointer data)
 200 {
 201         MailFilteringData *mail_filtering_data = (MailFilteringData *) source;
 202         MsgInfo *msginfo = mail_filtering_data->msginfo;
 203         gboolean is_spam = FALSE, error = FALSE;
 204         static gboolean warned_error = FALSE;
 205         FILE *fp = NULL;
 206         int pid = 0;
 207         int status;
 208
 209         /* SPAMASSASSIN_DISABLED : keep test for compatibility purpose */
 210         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 211                 log_warning(LOG_PROTOCOL, _("SpamAssassin plugin is disabled by its preferences.\n"));
 212                 return FALSE;
 213         }
 214         debug_print("Filtering message %d\n", msginfo->msgnum);
 215         if (message_callback != NULL)
 216                 message_callback(_("SpamAssassin: filtering message..."));
 217
 218         if ((fp = procmsg_open_message(msginfo)) == NULL) {
 219                 debug_print("failed to open message file\n");
 220                 return FALSE;
 221         }
 222
 223         if (config.whitelist_ab) {
 224                 gchar *ab_folderpath;
 225                 gboolean whitelisted = FALSE;
 226
 227                 if (*config.whitelist_ab_folder == '\0' ||
 228                         strcasecmp(config.whitelist_ab_folder, "Any") == 0) {
 229                         /* match the whole addressbook */
 230                         ab_folderpath = NULL;
 231                 } else {
 232                         /* match the specific book/folder of the addressbook */
 233                         ab_folderpath = config.whitelist_ab_folder;
 234                 }
 235
 236                 start_address_completion(ab_folderpath);
 237                 if (msginfo->from &&
 238                     found_in_addressbook(msginfo->from))
 239                                 whitelisted = TRUE;
 240                 end_address_completion();
 241
 242                 if (whitelisted) {
 243                         debug_print("message is ham (whitelisted)\n");
 244                         fclose(fp);
 245                         return FALSE;
 246                 }
 247         }
 248         pid = fork();
 249         if (pid == 0) {
 250                 _exit(msg_is_spam(fp));
 251         } else {
 252                 gint running = 0;
 253
 254                 running |= CHILD_RUNNING;
 255
 256                 g_timeout_add(50, timeout_func, &running);
 257                 running |= TIMEOUT_RUNNING;
 258
 259                 while(running & CHILD_RUNNING) {
 260                         int ret;
 261
 262                         ret = waitpid(pid, &status, WNOHANG);
 263                         if (ret == pid) {
 264                                 if (WIFEXITED(status)) {
 265                                         MsgStatus result = MSG_IS_HAM;
 266                                         running &= ~CHILD_RUNNING;
 267                                         result = WEXITSTATUS(status);
 268                                         is_spam = (result == MSG_IS_SPAM) ? TRUE : FALSE;
 269                                         error = (result == MSG_FILTERING_ERROR);
 270                                 }
 271                         } if (ret < 0) {
 272                                 running &= ~CHILD_RUNNING;
 273                         } /* ret == 0 continue */
 274
 275                         g_main_context_iteration(NULL, TRUE);
 276                 }
 277
 278                 while (running & TIMEOUT_RUNNING)
 279                         g_main_context_iteration(NULL, TRUE);
 280         }
 281
 282         fclose(fp);
 283
 284         if (is_spam) {
 285                 debug_print("message is spam\n");
 286                 procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 287                 if (config.receive_spam) {
 288                         FolderItem *save_folder = NULL;
 289
 290                         if ((!config.save_folder) ||
 291                             (config.save_folder[0] == '\0') ||
 292                             ((save_folder = folder_find_item_from_identifier(config.save_folder)) == NULL)) {
 293                                 if (mail_filtering_data->account && mail_filtering_data->account->set_trash_folder) {
 294                                         save_folder = folder_find_item_from_identifier(
 295                                                 mail_filtering_data->account->trash_folder);
 296                                         if (save_folder)
 297                                                 debug_print("found trash folder from account's advanced settings\n");
 298                                 }
 299                                 if (save_folder == NULL && mail_filtering_data->account &&
 300                                     mail_filtering_data->account->folder) {
 301                                         save_folder = mail_filtering_data->account->folder->trash;
 302                                         if (save_folder)
 303                                                 debug_print("found trash folder from account's trash\n");
 304                                 }
 305                                 if (save_folder == NULL && mail_filtering_data->account &&
 306                                     !mail_filtering_data->account->folder)  {
 307                                         if (mail_filtering_data->account->inbox) {
 308                                                 FolderItem *item = folder_find_item_from_identifier(
 309                                                         mail_filtering_data->account->inbox);
 310                                                 if (item && item->folder->trash) {
 311                                                         save_folder = item->folder->trash;
 312                                                         debug_print("found trash folder from account's inbox\n");
 313                                                 }
 314                                         }
 315                                         if (!save_folder && mail_filtering_data->account->local_inbox) {
 316                                                 FolderItem *item = folder_find_item_from_identifier(
 317                                                         mail_filtering_data->account->local_inbox);
 318                                                 if (item && item->folder->trash) {
 319                                                         save_folder = item->folder->trash;
 320                                                         debug_print("found trash folder from account's local_inbox\n");
 321                                                 }
 322                                         }
 323                                 }
 324                                 if (save_folder == NULL) {
 325                                         debug_print("using default trash folder\n");
 326                                         save_folder = folder_get_default_trash();
 327                                 }
 328                         }
 329                         if (config.mark_as_read)
 330                                 procmsg_msginfo_unset_flags(msginfo, ~0, 0);
 331                         procmsg_msginfo_set_flags(msginfo, MSG_SPAM, 0);
 332                         msginfo->filter_op = IS_MOVE;
 333                         msginfo->to_filter_folder = save_folder;
 334                 } else {
 335                         folder_item_remove_msg(msginfo->folder, msginfo->msgnum);
 336                 }
 337
 338                 return TRUE;
 339         } else {
 340                 debug_print("message is ham\n");
 341                 procmsg_msginfo_unset_flags(msginfo, MSG_SPAM, 0);
 342         }
 343
 344         if (error) {
 345                 gchar *msg = _("The SpamAssassin plugin couldn't filter "
 346                                            "a message. The probable cause of the error "
 347                                            "is an unreachable spamd daemon. Please make "
 348                                            "sure spamd is running and accessible.");
 349                 if (!prefs_common_get_prefs()->no_recv_err_panel) {
 350                         if (!warned_error) {
 351                                 alertpanel_error("%s", msg);
 352                         }
 353                         warned_error = TRUE;
 354                 } else {
 355                         log_error(LOG_PROTOCOL, "%s\n", msg);
 356                 }
 357         }
 358
 359         return FALSE;
 360 }
 361
 362 SpamAssassinConfig *spamassassin_get_config(void)
 363 {
 364         return &config;
 365 }
 366
 367 gchar* spamassassin_create_tmp_spamc_wrapper(gboolean spam)
 368 {
 369         gchar *contents;
 370         gchar *fname = get_tmp_file();
 371
 372         if (fname != NULL) {
 373                 contents = g_strdup_printf(
 374                                                 "spamc -d %s -p %u -u %s -t %u -s %u -L %s<\"$*\";exit $?",
 375                                                 config.hostname, config.port,
 376                                                 config.username, config.timeout,
 377                                                 config.max_size * 1024, spam?"spam":"ham");
 378                 if (str_write_to_file(contents, fname) < 0) {
 379                         g_free(fname);
 380                         fname = NULL;
 381                 }
 382                 g_free(contents);
 383         }
 384         /* returned pointer must be free'ed by caller */
 385         return fname;
 386 }
 387
 388 int spamassassin_learn(MsgInfo *msginfo, GSList *msglist, gboolean spam)
 389 {
 390         gchar *cmd = NULL;
 391         gchar *file = NULL;
 392         const gchar *shell = g_getenv("SHELL");
 393         gchar *spamc_wrapper = NULL;
 394
 395         if (msginfo == NULL && msglist == NULL) {
 396                 return -1;
 397         }
 398
 399         if (config.transport == SPAMASSASSIN_TRANSPORT_TCP
 400         &&  prefs_common_get_prefs()->work_offline
 401         &&  !inc_offline_should_override(TRUE,
 402                 _("Claws Mail needs network access in order "
 403                   "to feed the mail to the remote learner."))) {
 404                 return -1;
 405         }
 406
 407         if (msginfo) {
 408                 file = procmsg_get_message_file(msginfo);
 409                 if (file == NULL) {
 410                         return -1;
 411                 }
 412                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 413                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 414                         if (spamc_wrapper != NULL) {
 415                                 cmd = g_strconcat(shell?shell:"sh", " ",
 416                                                                 spamc_wrapper, " ", file, NULL);
 417                         }
 418                 } else {
 419                         cmd = g_strdup_printf("sa-learn -u %s%s %s %s",
 420                                                         config.username,
 421                                                         prefs_common_get_prefs()->work_offline?" -L":"",
 422                                                         spam?"--spam":"--ham", file);
 423                 }
 424         }
 425         if (msglist) {
 426                 GSList *cur = msglist;
 427                 MsgInfo *info;
 428
 429                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP) {
 430                         /* execute n-times the spamc command */
 431                         for (; cur; cur = cur->next) {
 432                                 info = (MsgInfo *)cur->data;
 433                                 gchar *tmpcmd = NULL;
 434                                 gchar *tmpfile = get_tmp_file();
 435
 436                                 if (spamc_wrapper == NULL) {
 437                                         spamc_wrapper = spamassassin_create_tmp_spamc_wrapper(spam);
 438                                 }
 439
 440                                 if (spamc_wrapper && tmpfile &&
 441                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 442                                         tmpcmd = g_strconcat(shell?shell:"sh", " ", spamc_wrapper, " ",
 443                                                                                 tmpfile, NULL);
 444                                         debug_print("%s\n", tmpcmd);
 445                                         execute_command_line(tmpcmd, FALSE, NULL);
 446                                         g_free(tmpcmd);
 447                                 }
 448                                 g_free(tmpfile);
 449                         }
 450                         g_free(spamc_wrapper);
 451                         return 0;
 452                 } else {
 453                         cmd = g_strdup_printf("sa-learn -u %s%s %s",
 454                                         config.username,
 455                                         prefs_common_get_prefs()->work_offline?" -L":"",
 456                                         spam?"--spam":"--ham");
 457
 458                         /* concatenate all message tmpfiles to the sa-learn command-line */
 459                         for (; cur; cur = cur->next) {
 460                                 info = (MsgInfo *)cur->data;
 461                                 gchar *tmpcmd = NULL;
 462                                 gchar *tmpfile = get_tmp_file();
 463
 464                                 if (tmpfile &&
 465                                 copy_file(procmsg_get_message_file(info), tmpfile, TRUE) == 0) {
 466                                         tmpcmd = g_strconcat(cmd, " ", tmpfile, NULL);
 467                                         g_free(cmd);
 468                                         cmd = tmpcmd;
 469                                 }
 470                                 g_free(tmpfile);
 471                         }
 472                 }
 473         }
 474         if (cmd == NULL) {
 475                 return -1;
 476         }
 477         debug_print("%s\n", cmd);
 478         /* only run sync calls to sa-learn/spamc to prevent system lockdown */
 479         execute_command_line(cmd, FALSE, NULL);
 480         g_free(cmd);
 481         g_free(spamc_wrapper);
 482
 483         return 0;
 484 }
 485
 486 void spamassassin_save_config(void)
 487 {
 488         PrefFile *pfile;
 489         gchar *rcpath;
 490
 491         debug_print("Saving SpamAssassin Page\n");
 492
 493         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 494         pfile = prefs_write_open(rcpath);
 495         g_free(rcpath);
 496         if (!pfile || (prefs_set_block_label(pfile, "SpamAssassin") < 0))
 497                 return;
 498
 499         if (prefs_write_param(param, pfile->fp) < 0) {
 500                 g_warning("Failed to write SpamAssassin configuration to file");
 501                 prefs_file_close_revert(pfile);
 502                 return;
 503         }
 504         if (fprintf(pfile->fp, "\n") < 0) {
 505                 FILE_OP_ERROR(rcpath, "fprintf");
 506                 prefs_file_close_revert(pfile);
 507         } else
 508                 prefs_file_close(pfile);
 509 }
 510
 511 gboolean spamassassin_check_username(void)
 512 {
 513         if (config.username == NULL || config.username[0] == '\0') {
 514                 config.username = (gchar*)g_get_user_name();
 515                 if (config.username == NULL) {
 516                         if (hook_id != HOOK_NONE) {
 517                                 spamassassin_unregister_hook();
 518                         }
 519                         procmsg_unregister_spam_learner(spamassassin_learn);
 520                         procmsg_spam_set_folder(NULL, NULL);
 521                         return FALSE;
 522                 }
 523         }
 524         return TRUE;
 525 }
 526
 527 void spamassassin_set_message_callback(MessageCallback callback)
 528 {
 529         message_callback = callback;
 530 }
 531
 532 gint plugin_init(gchar **error)
 533 {
 534         gchar *rcpath;
 535
 536         hook_id = HOOK_NONE;
 537
 538         if (!check_plugin_version(MAKE_NUMERIC_VERSION(2,9,2,72),
 539                                 VERSION_NUMERIC, PLUGIN_NAME, error))
 540                 return -1;
 541
 542         prefs_set_default(param);
 543         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 544         prefs_read_config(param, "SpamAssassin", rcpath, NULL);
 545         g_free(rcpath);
 546         if (!spamassassin_check_username()) {
 547                 *error = g_strdup(_("Failed to get username"));
 548                 return -1;
 549         }
 550 #ifdef G_OS_WIN32
 551         /* no Unix socket in Windows, and in case our config comes from Unix, switch to TCP */
 552         if (config.transport == SPAMASSASSIN_TRANSPORT_UNIX)
 553                 config.transport = SPAMASSASSIN_TRANSPORT_TCP;
 554 #endif
 555         spamassassin_gtk_init();
 556
 557         debug_print("SpamAssassin plugin loaded\n");
 558
 559         if (config.process_emails) {
 560                 spamassassin_register_hook();
 561         }
 562
 563         if (!config.enable || config.transport == SPAMASSASSIN_DISABLED) {
 564                 log_warning(LOG_PROTOCOL, _("SpamAssassin plugin is loaded but disabled by its preferences.\n"));
 565         }
 566         else {
 567                 if (config.transport == SPAMASSASSIN_TRANSPORT_TCP)
 568                         debug_print("Enabling learner with a remote spamassassin server requires spamc/spamd 3.1.x\n");
 569                 procmsg_register_spam_learner(spamassassin_learn);
 570                 procmsg_spam_set_folder(config.save_folder, spamassassin_get_spam_folder);
 571         }
 572
 573         return 0;
 574
 575 }
 576
 577 gboolean plugin_done(void)
 578 {
 579         if (hook_id != HOOK_NONE) {
 580                 spamassassin_unregister_hook();
 581         }
 582         g_free(config.hostname);
 583         g_free(config.save_folder);
 584         spamassassin_gtk_done();
 585         procmsg_unregister_spam_learner(spamassassin_learn);
 586         procmsg_spam_set_folder(NULL, NULL);
 587         debug_print("SpamAssassin plugin unloaded\n");
 588         return TRUE;
 589 }
 590
 591 const gchar *plugin_name(void)
 592 {
 593         return PLUGIN_NAME;
 594 }
 595
 596 const gchar *plugin_desc(void)
 597 {
 598         return _("This plugin can check all messages that are received from an "
 599                  "IMAP, LOCAL or POP account for spam using a SpamAssassin "
 600                  "server. You will need a SpamAssassin Server (spamd) running "
 601                  "somewhere.\n"
 602                  "\n"
 603                  "It can also be used for marking messages as Ham or Spam.\n"
 604                  "\n"
 605                  "When a message is identified as spam it can be deleted or "
 606                  "saved in a specially designated folder.\n"
 607                  "\n"
 608                  "Options can be found in /Configuration/Preferences/Plugins/SpamAssassin");
 609 }
 610
 611 const gchar *plugin_type(void)
 612 {
 613         return "GTK2";
 614 }
 615
 616 const gchar *plugin_licence(void)
 617 {
 618         return "GPL3+";
 619 }
 620
 621 const gchar *plugin_version(void)
 622 {
 623         return VERSION;
 624 }
 625
 626 struct PluginFeature *plugin_provides(void)
 627 {
 628         static struct PluginFeature features[] =
 629                 { {PLUGIN_FILTERING, N_("Spam detection")},
 630                   {PLUGIN_FILTERING, N_("Spam learning")},
 631                   {PLUGIN_NOTHING, NULL}};
 632         return features;
 633 }
 634
 635 void spamassassin_register_hook(void)
 636 {
 637         if (hook_id == HOOK_NONE)
 638                 hook_id = hooks_register_hook(MAIL_FILTERING_HOOKLIST, mail_filtering_hook, NULL);
 639         if (hook_id == HOOK_NONE) {
 640                 g_warning("Failed to register mail filtering hook");
 641                 config.process_emails = FALSE;
 642         }
 643 }
 644
 645 void spamassassin_unregister_hook(void)
 646 {
 647         if (hook_id != HOOK_NONE) {
 648                 hooks_unregister_hook(MAIL_FILTERING_HOOKLIST, hook_id);
 649         }
 650         hook_id = HOOK_NONE;
 651 }
 652
 653 FolderItem *spamassassin_get_spam_folder(MsgInfo *msginfo)
 654 {
 655         FolderItem *item = folder_find_item_from_identifier(config.save_folder);
 656
 657         if (item || msginfo == NULL || msginfo->folder == NULL)
 658                 return item;
 659
 660         if (msginfo->folder->folder &&
 661             msginfo->folder->folder->account &&
 662             msginfo->folder->folder->account->set_trash_folder) {
 663                 item = folder_find_item_from_identifier(
 664                         msginfo->folder->folder->account->trash_folder);
 665         }
 666
 667         if (item == NULL &&
 668             msginfo->folder->folder &&
 669             msginfo->folder->folder->trash)
 670                 item = msginfo->folder->folder->trash;
 671
 672         if (item == NULL)
 673                 item = folder_get_default_trash();
 674
 675         debug_print("SA spam dir: %s\n", folder_item_get_path(item));
 676         return item;
 677 }