src/plugins/spamassassin/spamassassin.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2003 Hiroyuki Yamamoto and the Sylpheed-Claws 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 2 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include "defs.h"
  25
  26 #include <glib.h>
  27
  28 #if HAVE_LOCALE_H
  29 #  include <locale.h>
  30 #endif
  31
  32 #include "plugin.h"
  33 #include "common/utils.h"
  34 #include "hooks.h"
  35 #include "procmsg.h"
  36 #include "folder.h"
  37 #include "prefs.h"
  38 #include "prefs_gtk.h"
  39 #include "intl.h"
  40
  41 #include "libspamc.h"
  42 #include "spamassassin.h"
  43
  44 #ifdef HAVE_SYSEXITS_H
  45 #include <sysexits.h>
  46 #endif
  47 #ifdef HAVE_ERRNO_H
  48 #include <errno.h>
  49 #endif
  50 #ifdef HAVE_SYS_ERRNO_H
  51 #include <sys/errno.h>
  52 #endif
  53 #ifdef HAVE_TIME_H
  54 #include <time.h>
  55 #endif
  56 #ifdef HAVE_SYS_TIME_H
  57 #include <sys/time.h>
  58 #endif
  59 #ifdef HAVE_SIGNAL_H
  60 #include <signal.h>
  61 #endif
  62 #ifdef HAVE_PWD_H
  63 #include <pwd.h>
  64 #endif
  65
  66 static gint hook_id;
  67 static int flags = SPAMC_RAW_MODE | SPAMC_SAFE_FALLBACK | SPAMC_CHECK_ONLY;
  68 static gchar *username = NULL;
  69
  70 static SpamAssassinConfig config;
  71
  72 static PrefParam param[] = {
  73         {"enable", "FALSE", &config.enable, P_BOOL,
  74          NULL, NULL, NULL},
  75         {"hostname", "localhost", &config.hostname, P_STRING,
  76          NULL, NULL, NULL},
  77         {"port", "783", &config.port, P_INT,
  78          NULL, NULL, NULL},
  79         {"max_size", "250", &config.max_size, P_INT,
  80          NULL, NULL, NULL},
  81         {"receive_spam", "TRUE", &config.receive_spam, P_BOOL,
  82          NULL, NULL, NULL},
  83         {"save_folder", NULL, &config.save_folder, P_STRING,
  84          NULL, NULL, NULL},
  85
  86         {NULL, NULL, NULL, P_OTHER, NULL, NULL, NULL}
  87 };
  88
  89 static gboolean mail_filtering_hook(gpointer source, gpointer data)
  90 {
  91         MailFilteringData *mail_filtering_data = (MailFilteringData *) source;
  92         MsgInfo *msginfo = mail_filtering_data->msginfo;
  93         gboolean is_spam = FALSE;
  94         FILE *fp = NULL;
  95         struct message m;
  96         gchar *oldlocale = NULL;
  97         struct sockaddr addr;
  98         int ret;
  99
 100         if (!config.enable)
 101                 return FALSE;
 102
 103         debug_print("Filtering message %d\n", msginfo->msgnum);
 104
 105         /* remember old locale and set it to C */
 106         Xstrdup_a(oldlocale, setlocale(LC_ALL, NULL), return FALSE);
 107         setlocale(LC_ALL, "C");
 108
 109         if (lookup_host(config.hostname, config.port, &addr) != EX_OK) {
 110                 debug_print("failed to look up spamd host\n");
 111                 return FALSE;
 112         }
 113
 114         m.type = MESSAGE_NONE;
 115         m.max_len = config.max_size * 1024;
 116         m.timeout = 30;
 117
 118         if ((fp = procmsg_open_message(msginfo)) == NULL) {
 119                 debug_print("failed to open message file\n");
 120                 return FALSE;
 121         }
 122
 123         if (message_read(fileno(fp), flags, &m) != EX_OK) {
 124                 debug_print("failed to read message\n");
 125                 fclose(fp);
 126                 message_cleanup(&m);
 127                 return FALSE;
 128         }
 129
 130         if ((ret = message_filter(&addr, username, flags, &m)) != EX_OK) {
 131                 debug_print("filtering the message failed\n");
 132                 fclose(fp);
 133                 message_cleanup(&m);
 134                 return FALSE;
 135         }
 136
 137         if (m.is_spam == EX_ISSPAM)
 138                 is_spam = TRUE;
 139
 140         message_cleanup(&m);
 141         fclose(fp);
 142         setlocale(LC_ALL, oldlocale);
 143
 144         if (is_spam) {
 145                 debug_print("message is spam\n");
 146
 147                 if (config.receive_spam) {
 148                         FolderItem *save_folder;
 149
 150                         if ((!config.save_folder) ||
 151                             (config.save_folder[0] == '\0') ||
 152                             ((save_folder = folder_find_item_from_identifier(config.save_folder)) == NULL))
 153                                 save_folder = folder_get_default_trash();
 154
 155                         procmsg_msginfo_unset_flags(msginfo, ~0, 0);
 156                         folder_item_move_msg(save_folder, msginfo);
 157                 } else {
 158                         folder_item_remove_msg(msginfo->folder, msginfo->msgnum);
 159                 }
 160
 161                 return TRUE;
 162         }
 163
 164         return FALSE;
 165 }
 166
 167 SpamAssassinConfig *spamassassin_get_config(void)
 168 {
 169         return &config;
 170 }
 171
 172 void spamassassin_save_config(void)
 173 {
 174         PrefFile *pfile;
 175         gchar *rcpath;
 176
 177         debug_print("Saving SpamAssassin Page\n");
 178
 179         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, COMMON_RC, NULL);
 180         pfile = prefs_write_open(rcpath);
 181         g_free(rcpath);
 182         if (!pfile || (prefs_set_block_label(pfile, "SpamAssassin") < 0))
 183                 return;
 184
 185         if (prefs_write_param(param, pfile->fp) < 0) {
 186                 g_warning("failed to write SpamAssassin configuration to file\n");
 187                 prefs_file_close_revert(pfile);
 188                 return;
 189         }
 190         fprintf(pfile->fp, "\n");
 191
 192         prefs_file_close(pfile);
 193 }
 194
 195 gint plugin_init(gchar **error)
 196 {
 197         hook_id = hooks_register_hook(MAIL_FILTERING_HOOKLIST, mail_filtering_hook, NULL);
 198         if (hook_id == -1) {
 199                 *error = g_strdup("Failed to register mail filtering hook");
 200                 return -1;
 201         }
 202
 203         username = g_get_user_name();
 204         if (username == NULL) {
 205                 *error = g_strdup("Failed to get username");
 206                 return -1;
 207         }
 208
 209         prefs_set_default(param);
 210         prefs_read_config(param, "SpamAssassin", COMMON_RC);
 211
 212         debug_print("Spamassassin plugin loaded\n");
 213
 214         return 0;
 215
 216 }
 217
 218 void plugin_done(void)
 219 {
 220         hooks_unregister_hook(MAIL_FILTERING_HOOKLIST, hook_id);
 221         g_free(config.hostname);
 222         g_free(config.save_folder);
 223
 224         debug_print("Spamassassin plugin unloaded\n");
 225 }
 226
 227 const gchar *plugin_name(void)
 228 {
 229         return _("SpamAssassin");
 230 }
 231
 232 const gchar *plugin_desc(void)
 233 {
 234         return _("This plugin checks all messages that are received from a POP "
 235                  "account for spam using a SpamAssassin server. You will need "
 236                  "a SpamAssassin Server (spamd) running somewhere.\n"
 237                  "\n"
 238                  "When a message is identified as spam it can be deleted or "
 239                  "saved into a special folder.\n"
 240                  "\n"
 241                  "This plugin only contains the actual function for filtering "
 242                  "and deleting or moving the message. You probably want to load "
 243                  "a User Interface plugin too, otherwise you will have to "
 244                  "manually write the plugin configuration.\n");
 245 }
 246
 247 const gchar *plugin_type(void)
 248 {
 249         return "Common";
 250 }