aboutsummaryrefslogtreecommitdiffstats
path: root/modules/spamassassin/evolution-spamassassin.c
blob: 7381e4a2ec151a5a3232d68f0da5ab5a15069aeb (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
/*
 * evolution-spamassassin.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#include <config.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <glib/gi18n-lib.h>

#include <camel/camel.h>

#include <shell/e-shell.h>
#include <e-util/e-mktemp.h>
#include <mail/e-mail-junk-filter.h>

/* Standard GObject macros */
#define E_TYPE_SPAM_ASSASSIN \
    (e_spam_assassin_get_type ())
#define E_SPAM_ASSASSIN(obj) \
    (G_TYPE_CHECK_INSTANCE_CAST \
    ((obj), E_TYPE_SPAM_ASSASSIN, ESpamAssassin))

#ifndef SPAMASSASSIN_BINARY
#define SPAMASSASSIN_BINARY "/usr/bin/spamassassin"
#endif

#ifndef SA_LEARN_BINARY
#define SA_LEARN_BINARY "/usr/bin/sa-learn"
#endif

#ifndef SPAMC_BINARY
#define SPAMC_BINARY "/usr/bin/spamc"
#endif

#ifndef SPAMD_BINARY
#define SPAMD_BINARY "/usr/bin/spamd"
#endif

/* For starting our own daemon. */
#define DAEMON_MAX_RETRIES 100
#define DAEMON_RETRY_DELAY 0.05  /* seconds */

#define SPAM_ASSASSIN_EXIT_STATUS_SUCCESS   0
#define SPAM_ASSASSIN_EXIT_STATUS_ERROR     -1

typedef struct _ESpamAssassin ESpamAssassin;
typedef struct _ESpamAssassinClass ESpamAssassinClass;

struct _ESpamAssassin {
    EMailJunkFilter parent;

    GMutex *socket_path_mutex;

    gchar *pid_file;
    gchar *socket_path;
    gchar *spamc_binary;
    gchar *spamd_binary;
    gint version;

    gboolean local_only;
    gboolean use_daemon;
    gboolean version_set;

    /* spamc/spamd state */
    gboolean spamd_tested;
    gboolean spamd_using_allow_tell;
    gboolean system_spamd_available;
    gboolean use_spamc;
};

struct _ESpamAssassinClass {
    EMailJunkFilterClass parent_class;
};

enum {
    PROP_0,
    PROP_LOCAL_ONLY,
    PROP_SPAMC_BINARY,
    PROP_SPAMD_BINARY,
    PROP_SOCKET_PATH,
    PROP_USE_DAEMON
};

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

/* Forward Declarations */
GType e_spam_assassin_get_type (void);
static void e_spam_assassin_interface_init (CamelJunkFilterInterface *interface);

G_DEFINE_DYNAMIC_TYPE_EXTENDED (
    ESpamAssassin,
    e_spam_assassin,
    E_TYPE_MAIL_JUNK_FILTER, 0,
    G_IMPLEMENT_INTERFACE_DYNAMIC (
        CAMEL_TYPE_JUNK_FILTER,
        e_spam_assassin_interface_init))

#ifdef G_OS_UNIX
static void
spam_assassin_cancelled_cb (GCancellable *cancellable,
                            GPid *pid)
{
    /* XXX On UNIX-like systems we can safely assume a GPid is the
     *     process ID and use it to terminate the process via signal. */
    kill (*pid, SIGTERM);
}
#endif

static void
spam_assassin_exited_cb (GPid *pid,
                         gint status,
                         gpointer user_data)
{
    struct {
        GMainLoop *loop;
        gint exit_code;
    } *source_data = user_data;

    if (WIFEXITED (status))
        source_data->exit_code = WEXITSTATUS (status);
    else
        source_data->exit_code = SPAM_ASSASSIN_EXIT_STATUS_ERROR;

    g_main_loop_quit (source_data->loop);
}

static gint
spam_assassin_command_full (const gchar **argv,
                            CamelMimeMessage *message,
                            const gchar *input_data,
                            GByteArray *output_buffer,
                            gboolean wait_for_termination,
                            GCancellable *cancellable,
                            GError **error)
{
    GMainContext *context;
    GSpawnFlags flags = 0;
    GSource *source;
    GPid child_pid;
    gint standard_input;
    gint standard_output;
    gulong handler_id = 0;
    gboolean success;

    struct {
        GMainLoop *loop;
        gint exit_code;
    } source_data;

    if (wait_for_termination)
        flags |= G_SPAWN_DO_NOT_REAP_CHILD;
    if (output_buffer == NULL)
        flags |= G_SPAWN_STDOUT_TO_DEV_NULL;
    flags |= G_SPAWN_STDERR_TO_DEV_NULL;

    /* Spawn SpamAssassin with an open stdin pipe. */
    success = g_spawn_async_with_pipes (
        NULL,
        (gchar **) argv,
        NULL,
        flags,
        NULL, NULL,
        &child_pid,
        &standard_input,
        (output_buffer != NULL) ? &standard_output : NULL,
        NULL,
        error);

    if (!success) {
        gchar *command_line;

        command_line = g_strjoinv (" ", (gchar **) argv);
        g_prefix_error (
            error, _("Failed to spawn SpamAssassin (%s): "),
            command_line);
        g_free (command_line);

        return SPAM_ASSASSIN_EXIT_STATUS_ERROR;
    }

    if (message != NULL) {
        CamelStream *stream;
        gssize bytes_written;

        /* Stream the CamelMimeMessage to SpamAssassin. */
        stream = camel_stream_fs_new_with_fd (standard_input);
        bytes_written = camel_data_wrapper_write_to_stream_sync (
            CAMEL_DATA_WRAPPER (message),
            stream, cancellable, error);
        success = (bytes_written >= 0) &&
            (camel_stream_close (stream, cancellable, error) == 0);
        g_object_unref (stream);

        if (!success) {
            g_spawn_close_pid (child_pid);
            g_prefix_error (
                error, _("Failed to stream mail "
                "message content to SpamAssassin: "));
            return SPAM_ASSASSIN_EXIT_STATUS_ERROR;
        }

    } else if (input_data != NULL) {
        gssize bytes_written;

        /* Write raw data directly to SpamAssassin. */
        bytes_written = camel_write (
            standard_input, input_data,
            strlen (input_data), cancellable, error);
        success = (bytes_written >= 0);

        close (standard_input);

        if (!success) {
            g_spawn_close_pid (child_pid);
            g_prefix_error (
                error, _("Failed to write '%s' "
                "to SpamAssassin: "), input_data);
            return SPAM_ASSASSIN_EXIT_STATUS_ERROR;
        }
    }

    if (output_buffer != NULL) {
        CamelStream *input_stream;
        CamelStream *output_stream;
        gssize bytes_written;

        input_stream = camel_stream_fs_new_with_fd (standard_output);

        output_stream = camel_stream_mem_new ();
        camel_stream_mem_set_byte_array (
            CAMEL_STREAM_MEM (output_stream), output_buffer);

        bytes_written = camel_stream_write_to_stream (
            input_stream, output_stream, cancellable, error);
        g_byte_array_append (output_buffer, (guint8 *) "", 1);
        success = (bytes_written >= 0);

        g_object_unref (input_stream);
        g_object_unref (output_stream);

        if (!success) {
            g_spawn_close_pid (child_pid);
            g_prefix_error (
                error, _("Failed to read "
                "output from SpamAssassin: "));
            return SPAM_ASSASSIN_EXIT_STATUS_ERROR;
        }
    }

    /* XXX I'm not sure if we should call g_spawn_close_pid()
     *     here or not.  Only really matters on Windows anyway. */
    if (!wait_for_termination)
        return 0;

    /* Wait for the SpamAssassin process to terminate
     * using GLib's main loop for better portability. */

    context = g_main_context_new ();

    source = g_child_watch_source_new (child_pid);
    g_source_set_callback (
        source, (GSourceFunc)
        spam_assassin_exited_cb,
        &source_data, NULL);
    g_source_attach (source, context);
    g_source_unref (source);

    source_data.loop = g_main_loop_new (context, TRUE);
    source_data.exit_code = 0;

#ifdef G_OS_UNIX
    if (G_IS_CANCELLABLE (cancellable))
        handler_id = g_cancellable_connect (
            cancellable,
            G_CALLBACK (spam_assassin_cancelled_cb),
            &child_pid, (GDestroyNotify) NULL);
#endif

    g_main_loop_run (source_data.loop);

    if (handler_id > 0)
        g_cancellable_disconnect (cancellable, handler_id);

    g_main_loop_unref (source_data.loop);
    source_data.loop = NULL;

    g_main_context_unref (context);

    /* Clean up. */

    g_spawn_close_pid (child_pid);

    if (g_cancellable_set_error_if_cancelled (cancellable, error))
        source_data.exit_code = SPAM_ASSASSIN_EXIT_STATUS_ERROR;

    else if (source_data.exit_code == SPAM_ASSASSIN_EXIT_STATUS_ERROR)
        g_set_error_literal (
            error, CAMEL_ERROR, CAMEL_ERROR_GENERIC,
            _("SpamAssassin either crashed or "
              "failed to process a mail message"));

    return source_data.exit_code;
}

static gint
spam_assassin_command (const gchar **argv,
                       CamelMimeMessage *message,
                       const gchar *input_data,
                       GCancellable *cancellable,
                       GError **error)
{
    return spam_assassin_command_full (
        argv, message, input_data, NULL, TRUE, cancellable, error);
}

static gboolean
spam_assassin_get_local_only (ESpamAssassin *extension)
{
    return extension->local_only;
}

static void
spam_assassin_set_local_only (ESpamAssassin *extension,
                              gboolean local_only)
{
    extension->local_only = local_only;

    g_object_notify (G_OBJECT (extension), "local-only");
}

static const gchar *
spam_assassin_get_spamc_binary (ESpamAssassin *extension)
{
    return extension->spamc_binary;
}

static void
spam_assassin_set_spamc_binary (ESpamAssassin *extension,
                                const gchar *spamc_binary)
{
    g_free (extension->spamc_binary);
    extension->spamc_binary = g_strdup (spamc_binary);

    g_object_notify (G_OBJECT (extension), "spamc-binary");
}

static const gchar *
spam_assassin_get_spamd_binary (ESpamAssassin *extension)
{
    return extension->spamd_binary;
}

static void
spam_assassin_set_spamd_binary (ESpamAssassin *extension,
                                const gchar *spamd_binary)
{
    g_free (extension->spamd_binary);
    extension->spamd_binary = g_strdup (spamd_binary);

    g_object_notify (G_OBJECT (extension), "spamd-binary");
}

static const gchar *
spam_assassin_get_socket_path (ESpamAssassin *extension)
{
    return extension->socket_path;
}

static void
spam_assassin_set_socket_path (ESpamAssassin *extension,
                               const gchar *socket_path)
{
    g_free (extension->socket_path);
    extension->socket_path = g_strdup (socket_path);

    g_object_notify (G_OBJECT (extension), "socket-path");
}

static gboolean
spam_assassin_get_use_daemon (ESpamAssassin *extension)
{
    return extension->use_daemon;
}

static void
spam_assassin_set_use_daemon (ESpamAssassin *extension,
                              gboolean use_daemon)
{
    extension->use_daemon = use_daemon;

    g_object_notify (G_OBJECT (extension), "use-daemon");
}

static gboolean
spam_assassin_get_version (ESpamAssassin *extension,
                           gint *spam_assassin_version,
                           GCancellable *cancellable,
                           GError **error)
{
    GByteArray *output_buffer;
    gint exit_code;
    guint ii;

    const gchar *argv[] = {
        SA_LEARN_BINARY,
        "--version",
        NULL
    };

    if (extension->version_set) {
        if (spam_assassin_version != NULL)
            *spam_assassin_version = extension->version;
        return TRUE;
    }

    output_buffer = g_byte_array_new ();

    exit_code = spam_assassin_command_full (
        argv, NULL, NULL, output_buffer, TRUE, cancellable, error);

    if (exit_code != 0) {
        g_byte_array_free (output_buffer, TRUE);
        return FALSE;
    }

    for (ii = 0; ii < output_buffer->len; ii++) {
        if (g_ascii_isdigit (output_buffer->data[ii])) {
            guint8 ch = output_buffer->data[ii];
            extension->version = (ch - '0');
            extension->version_set = TRUE;
            break;
        }
    }

    if (spam_assassin_version != NULL)
        *spam_assassin_version = extension->version;

    g_byte_array_free (output_buffer, TRUE);

    return TRUE;
}

static void
spam_assassin_test_spamd_allow_tell (ESpamAssassin *extension)
{
    gint exit_code;
    GError *error = NULL;

    const gchar *argv[] = {
        SPAMC_BINARY,
        "--learntype=forget",
        NULL
    };

    /* Check if spamd is running with --allow-tell. */

    exit_code = spam_assassin_command (argv, NULL, "\n", NULL, &error);
    extension->spamd_using_allow_tell = (exit_code == 0);

    if (error != NULL) {
        g_warning ("%s", error->message);
        g_error_free (error);
    }
}

static gboolean
spam_assassin_test_spamd_running (ESpamAssassin *extension,
                                  gboolean system_spamd)
{
    const gchar *argv[5];
    gint exit_code;
    gint ii = 0;
    GError *error = NULL;

    g_mutex_lock (extension->socket_path_mutex);

    argv[ii++] = extension->spamc_binary;
    argv[ii++] = "--no-safe-fallback";
    if (!system_spamd) {
        argv[ii++] = "--socket";
        argv[ii++] = extension->socket_path;
    }
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command (
        argv, NULL, "From test@127.0.0.1", NULL, &error);

    if (error != NULL) {
        g_warning ("%s", error->message);
        g_error_free (error);
    }

    g_mutex_unlock (extension->socket_path_mutex);

    return (exit_code == 0);
}

static void
spam_assassin_kill_our_own_daemon (ESpamAssassin *extension)
{
    gint pid;
    gchar *contents = NULL;
    GError *error = NULL;

    g_mutex_lock (extension->socket_path_mutex);

    g_free (extension->socket_path);
    extension->socket_path = NULL;

    g_mutex_unlock (extension->socket_path_mutex);

    if (extension->pid_file == NULL)
        return;

    g_file_get_contents (extension->pid_file, &contents, NULL, &error);

    if (error != NULL) {
        g_warn_if_fail (contents == NULL);
        g_warning ("%s", error->message);
        g_error_free (error);
        return;
    }

    g_return_if_fail (contents != NULL);

    pid = atoi (contents);
    g_free (contents);

    if (pid > 0 && kill (pid, SIGTERM) == 0)
        waitpid (pid, NULL, 0);
}

static void
spam_assassin_prepare_for_quit (EShell *shell,
                                EActivity *activity,
                                ESpamAssassin *extension)
{
    spam_assassin_kill_our_own_daemon (extension);
}

static gboolean
spam_assassin_start_our_own_daemon (ESpamAssassin *extension)
{
    const gchar *argv[8];
    gchar *pid_file;
    gchar *socket_path;
    gboolean started = FALSE;
    gint exit_code;
    gint ii = 0;
    GError *error = NULL;

    g_mutex_lock (extension->socket_path_mutex);

    pid_file = e_mktemp ("spamd-pid-file-XXXXXX");
    socket_path = e_mktemp ("spamd-socket-path-XXXXXX");

    argv[ii++] = extension->spamd_binary;
    argv[ii++] = "--socketpath";
    argv[ii++] = socket_path;

    if (spam_assassin_get_local_only (extension))
        argv[ii++] = "--local";

    argv[ii++] = "--max-children=1";
    argv[ii++] = "--pidfile";
    argv[ii++] = pid_file;
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command_full (
        argv, NULL, NULL, NULL, FALSE, NULL, &error);

    if (error != NULL) {
        g_warning ("%s", error->message);
        g_error_free (error);
        goto exit;
    }

    if (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS) {
        /* Wait for the socket path to appear. */
        for (ii = 0; ii < DAEMON_MAX_RETRIES; ii++) {
            if (g_file_test (socket_path, G_FILE_TEST_EXISTS)) {
                started = TRUE;
                break;
            }
            g_usleep (DAEMON_RETRY_DELAY * G_USEC_PER_SEC);
        }
    }

    /* Set these directly to avoid emitting "notify" signals. */
    if (started) {
        g_free (extension->pid_file);
        extension->pid_file = pid_file;
        pid_file = NULL;

        g_free (extension->socket_path);
        extension->socket_path = socket_path;
        socket_path = NULL;

        /* XXX EMailSession is too prone to reference leaks to leave
         *     this for our finalize() method.  We want to be sure to
         *     kill the spamd process we started when Evolution shuts
         *     down, so connect to an EShell signal instead. */
        g_signal_connect (
            e_shell_get_default (), "prepare-for-quit",
            G_CALLBACK (spam_assassin_prepare_for_quit),
            extension);
    }

exit:
    g_free (pid_file);
    g_free (socket_path);

    g_mutex_unlock (extension->socket_path_mutex);

    return started;
}

static void
spam_assassin_test_spamd (ESpamAssassin *extension)
{
    const gchar *spamd_binary;
    gboolean try_system_spamd;

    /* XXX SpamAssassin could really benefit from a D-Bus interface
     *     these days.  These tests are just needlessly painful for
     *     clients trying to talk to an already-running spamd. */

    extension->use_spamc = FALSE;
    spamd_binary = extension->spamd_binary;
    try_system_spamd = (g_strcmp0 (spamd_binary, SPAMD_BINARY) == 0);

    if (extension->local_only && try_system_spamd) {
        gint exit_code;

        /* Run a shell command to check for a running
         * spamd process with a -L/--local option or a
         * -p/--port option. */

        const gchar *argv[] = {
            "/bin/sh",
            "-c",
            "ps ax | grep -v grep | "
            "grep -E 'spamd.*(\\-L|\\-\\-local)' | "
            "grep -E -v '\\ \\-p\\ |\\ \\-\\-port\\ '",
            NULL
        };

        exit_code = spam_assassin_command (
            argv, NULL, NULL, NULL, NULL);
        try_system_spamd = (exit_code == 0);
    }

    /* Try to use the system spamd first. */
    if (try_system_spamd) {
        if (spam_assassin_test_spamd_running (extension, TRUE)) {
            extension->use_spamc = TRUE;
            extension->system_spamd_available = TRUE;
        }
    }

    /* If there's no system spamd running, try
     * to use one with a user specified socket. */
    if (!extension->use_spamc && extension->socket_path != NULL) {
        if (spam_assassin_test_spamd_running (extension, FALSE)) {
            extension->use_spamc = TRUE;
            extension->system_spamd_available = FALSE;
        }
    }

    /* Still unsuccessful?  Try to start our own spamd. */
    if (!extension->use_spamc) {
        extension->use_spamc =
            spam_assassin_start_our_own_daemon (extension) &&
            spam_assassin_test_spamd_running (extension, FALSE);
    }
}

static void
spam_assassin_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_LOCAL_ONLY:
            spam_assassin_set_local_only (
                E_SPAM_ASSASSIN (object),
                g_value_get_boolean (value));
            return;

        case PROP_SPAMC_BINARY:
            spam_assassin_set_spamc_binary (
                E_SPAM_ASSASSIN (object),
                g_value_get_string (value));
            return;

        case PROP_SPAMD_BINARY:
            spam_assassin_set_spamd_binary (
                E_SPAM_ASSASSIN (object),
                g_value_get_string (value));
            return;

        case PROP_SOCKET_PATH:
            spam_assassin_set_socket_path (
                E_SPAM_ASSASSIN (object),
                g_value_get_string (value));
            return;

        case PROP_USE_DAEMON:
            spam_assassin_set_use_daemon (
                E_SPAM_ASSASSIN (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
spam_assassin_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_LOCAL_ONLY:
            g_value_set_boolean (
                value, spam_assassin_get_local_only (
                E_SPAM_ASSASSIN (object)));
            return;

        case PROP_SPAMC_BINARY:
            g_value_set_string (
                value, spam_assassin_get_spamc_binary (
                E_SPAM_ASSASSIN (object)));
            return;

        case PROP_SPAMD_BINARY:
            g_value_set_string (
                value, spam_assassin_get_spamd_binary (
                E_SPAM_ASSASSIN (object)));
            return;

        case PROP_SOCKET_PATH:
            g_value_set_string (
                value, spam_assassin_get_socket_path (
                E_SPAM_ASSASSIN (object)));
            return;

        case PROP_USE_DAEMON:
            g_value_set_boolean (
                value, spam_assassin_get_use_daemon (
                E_SPAM_ASSASSIN (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
spam_assassin_finalize (GObject *object)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (object);

    g_mutex_free (extension->socket_path_mutex);

    g_free (extension->pid_file);
    g_free (extension->socket_path);
    g_free (extension->spamc_binary);
    g_free (extension->spamd_binary);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_spam_assassin_parent_class)->finalize (object);
}

static gboolean
spam_assassin_available (EMailJunkFilter *junk_filter)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (junk_filter);
    gboolean available;
    GError *error = NULL;

    available = spam_assassin_get_version (extension, NULL, NULL, &error);

    /* XXX These tests block like crazy so maybe this isn't the best
     *     place to be doing this, but the first available() call is
     *     done at startup before the UI is shown.  So hopefully the
     *     delay will not be noticeable. */
    if (available && extension->use_daemon && !extension->spamd_tested) {
        extension->spamd_tested = TRUE;
        spam_assassin_test_spamd (extension);
        spam_assassin_test_spamd_allow_tell (extension);
    }

    if (error != NULL) {
        g_warning ("%s", error->message);
        g_error_free (error);
    }

    return available;
}

static GtkWidget *
spam_assassin_new_config_widget (EMailJunkFilter *junk_filter)
{
    GtkWidget *box;
    GtkWidget *widget;
    GtkWidget *container;
    gchar *markup;

    box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);

    markup = g_markup_printf_escaped (
        "<b>%s</b>", _("SpamAssassin Options"));
    widget = gtk_label_new (markup);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_label_set_use_markup (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (box), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);
    g_free (markup);

    widget = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
    gtk_box_pack_start (GTK_BOX (box), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_check_button_new_with_mnemonic (
        _("I_nclude remote tests"));
    gtk_widget_set_margin_left (widget, 12);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    g_object_bind_property (
        junk_filter, "local-only",
        widget, "active",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE |
        G_BINDING_INVERT_BOOLEAN);

    markup = g_markup_printf_escaped (
        "<small>%s</small>",
        _("This will make SpamAssassin more reliable, but slower."));
    widget = gtk_label_new (markup);
    gtk_widget_set_margin_left (widget, 36);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_label_set_use_markup (GTK_LABEL (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);
    g_free (markup);

    return box;
}

static gboolean
spam_assassin_classify (CamelJunkFilter *junk_filter,
                        CamelMimeMessage *message,
                        CamelJunkStatus *status,
                        GCancellable *cancellable,
                        GError **error)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (junk_filter);
    const gchar *argv[7];
    gboolean using_spamc;
    gint exit_code;
    gint ii = 0;

    g_mutex_lock (extension->socket_path_mutex);

    using_spamc = (extension->use_spamc && extension->use_daemon);

    if (using_spamc) {
        argv[ii++] = extension->spamc_binary;
        argv[ii++] = "--check";
        argv[ii++] = "--timeout=60";
        if (!extension->system_spamd_available) {
            argv[ii++] = "--socket";
            argv[ii++] = extension->socket_path;
        }
    } else {
        argv[ii++] = SPAMASSASSIN_BINARY;
        argv[ii++] = "--exit-code";
        if (extension->local_only)
            argv[ii++] = "--local";
    }
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command (
        argv, message, NULL, cancellable, error);

    /* For either program, exit code 0 means the message is ham. */
    if (exit_code == 0)
        *status = CAMEL_JUNK_STATUS_MESSAGE_IS_NOT_JUNK;

    /* spamassassin(1) only specifies zero and non-zero exit codes. */
    else if (!using_spamc)
        *status = CAMEL_JUNK_STATUS_MESSAGE_IS_JUNK;

    /* Whereas spamc(1) explicitly states exit code 1 means spam. */
    else if (exit_code == 1)
        *status = CAMEL_JUNK_STATUS_MESSAGE_IS_JUNK;

    /* Consider any other spamc(1) exit code to be inconclusive
     * since it most likely failed to process the message. */
    else
        *status = CAMEL_JUNK_STATUS_INCONCLUSIVE;

    /* Check that the return value and GError agree. */
    if (exit_code != SPAM_ASSASSIN_EXIT_STATUS_ERROR)
        g_warn_if_fail (error == NULL || *error == NULL);
    else
        g_warn_if_fail (error == NULL || *error != NULL);

    g_mutex_unlock (extension->socket_path_mutex);

    return (exit_code != SPAM_ASSASSIN_EXIT_STATUS_ERROR);
}

static gboolean
spam_assassin_learn_junk (CamelJunkFilter *junk_filter,
                          CamelMimeMessage *message,
                          GCancellable *cancellable,
                          GError **error)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (junk_filter);
    const gchar *argv[5];
    gint exit_code;
    gint ii = 0;

    if (extension->spamd_using_allow_tell) {
        argv[ii++] = extension->spamc_binary;
        argv[ii++] = "--learntype=spam";
    } else {
        argv[ii++] = SA_LEARN_BINARY;
        argv[ii++] = "--spam";
        if (extension->version >= 3)
            argv[ii++] = "--no-sync";
        else
            argv[ii++] = "--no-rebuild";
        if (extension->local_only)
            argv[ii++] = "--local";
    }
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command (
        argv, message, NULL, cancellable, error);

    /* Check that the return value and GError agree. */
    if (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS)
        g_warn_if_fail (error == NULL || *error == NULL);
    else
        g_warn_if_fail (error == NULL || *error != NULL);

    return (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS);
}

static gboolean
spam_assassin_learn_not_junk (CamelJunkFilter *junk_filter,
                              CamelMimeMessage *message,
                              GCancellable *cancellable,
                              GError **error)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (junk_filter);
    const gchar *argv[5];
    gint exit_code;
    gint ii = 0;

    if (extension->spamd_using_allow_tell) {
        argv[ii++] = extension->spamc_binary;
        argv[ii++] = "--learntype=ham";
    } else {
        argv[ii++] = SA_LEARN_BINARY;
        argv[ii++] = "--ham";
        if (extension->version >= 3)
            argv[ii++] = "--no-sync";
        else
            argv[ii++] = "--no-rebuild";
        if (extension->local_only)
            argv[ii++] = "--local";
    }
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command (
        argv, message, NULL, cancellable, error);

    /* Check that the return value and GError agree. */
    if (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS)
        g_warn_if_fail (error == NULL || *error == NULL);
    else
        g_warn_if_fail (error == NULL || *error != NULL);

    return (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS);
}

static gboolean
spam_assassin_synchronize (CamelJunkFilter *junk_filter,
                           GCancellable *cancellable,
                           GError **error)
{
    ESpamAssassin *extension = E_SPAM_ASSASSIN (junk_filter);
    const gchar *argv[4];
    gint exit_code;
    gint ii = 0;

    /* If we're using a spamd that allows learning,
     * there's no need to synchronize anything. */
    if (extension->spamd_using_allow_tell)
        return TRUE;

    argv[ii++] = SA_LEARN_BINARY;
    if (extension->version >= 3)
        argv[ii++] = "--sync";
    else
        argv[ii++] = "--rebuild";
    if (extension->local_only)
        argv[ii++] = "--local";
    argv[ii] = NULL;

    g_assert (ii < G_N_ELEMENTS (argv));

    exit_code = spam_assassin_command (
        argv, NULL, NULL, cancellable, error);

    /* Check that the return value and GError agree. */
    if (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS)
        g_warn_if_fail (error == NULL || *error == NULL);
    else
        g_warn_if_fail (error == NULL || *error != NULL);

    return (exit_code == SPAM_ASSASSIN_EXIT_STATUS_SUCCESS);
}

static void
e_spam_assassin_class_init (ESpamAssassinClass *class)
{
    GObjectClass *object_class;
    EMailJunkFilterClass *junk_filter_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = spam_assassin_set_property;
    object_class->get_property = spam_assassin_get_property;
    object_class->finalize = spam_assassin_finalize;

    junk_filter_class = E_MAIL_JUNK_FILTER_CLASS (class);
    junk_filter_class->filter_name = "SpamAssassin";
    junk_filter_class->display_name = _("SpamAssassin");
    junk_filter_class->available = spam_assassin_available;
    junk_filter_class->new_config_widget = spam_assassin_new_config_widget;

    /* XXX Argh, the boolean sense of the GSettings key is inverted from
     *     that of the checkbox widget.  The checkbox wording is more
     *     natural, but GConfBridge doesn't support transform functions
     *     so the property has to match the sense of the GConf key. */
    g_object_class_install_property (
        object_class,
        PROP_LOCAL_ONLY,
        g_param_spec_boolean (
            "local-only",
            "Local Only",
            "Do not use tests requiring DNS lookups",
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SPAMC_BINARY,
        g_param_spec_string (
            "spamc-binary",
            "spamc Binary",
            "File path for the spamc binary",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SPAMD_BINARY,
        g_param_spec_string (
            "spamd-binary",
            "spamd Binary",
            "File path for the spamd binary",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SOCKET_PATH,
        g_param_spec_string (
            "socket-path",
            "Socket Path",
            "Socket path for a SpamAssassin daemon",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_USE_DAEMON,
        g_param_spec_boolean (
            "use-daemon",
            "Use Daemon",
            "Whether to use a SpamAssassin daemon",
            FALSE,
            G_PARAM_READWRITE));
}

static void
e_spam_assassin_class_finalize (ESpamAssassinClass *class)
{
}

static void
e_spam_assassin_interface_init (CamelJunkFilterInterface *interface)
{
    interface->classify = spam_assassin_classify;
    interface->learn_junk = spam_assassin_learn_junk;
    interface->learn_not_junk = spam_assassin_learn_not_junk;
    interface->synchronize = spam_assassin_synchronize;
}

static void
e_spam_assassin_init (ESpamAssassin *extension)
{
    GSettings *settings;

    extension->socket_path_mutex = g_mutex_new ();

    /* XXX Once we move to GSettings these probably don't
     *     need to be properties anymore.  GConfBridge is
     *     just easier to deal with than GConfClient. */

    settings = g_settings_new ("org.gnome.evolution.mail");

    g_settings_bind (settings, "junk-sa-local-only", G_OBJECT (extension), "local-only", G_SETTINGS_BIND_DEFAULT);
    g_settings_bind (settings, "junk-sa-spamc-binary", G_OBJECT (extension), "spamc-binary", G_SETTINGS_BIND_DEFAULT);
    g_settings_bind (settings, "junk-sa-spamd-binary", G_OBJECT (extension), "spamd-binary", G_SETTINGS_BIND_DEFAULT);
    g_settings_bind (settings, "junk-sa-socket-path", G_OBJECT (extension), "socket-path", G_SETTINGS_BIND_DEFAULT);
    g_settings_bind (settings, "junk-sa-use-daemon", G_OBJECT (extension), "use-daemon", G_SETTINGS_BIND_DEFAULT);

    g_object_unref (settings);

    if (extension->spamc_binary == NULL)
        extension->spamc_binary = g_strdup (SPAMC_BINARY);

    if (extension->spamd_binary == NULL)
        extension->spamd_binary = g_strdup (SPAMD_BINARY);
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
    e_spam_assassin_register_type (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}