summaryrefslogtreecommitdiff
path: root/mail.local/main.c
blob: 119cd8654911274850b5ed30e862638dd1476de6 (plain)
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
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.

   GNU Mailutils is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   GNU Mailutils 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GNU Mailutils; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301 USA */

#include <mail.local.h>

int multiple_delivery;     /* Don't return errors when delivering to multiple
			      recipients */
int ex_quota_tempfail;     /* Return temporary failure if mailbox quota is
			      exceeded. If this variable is not set, mail.local
			      will return "service unavailable" */
int exit_code = EX_OK;     /* Exit code to be used */
uid_t uid;                 /* Current user name */
char *quotadbname = NULL;  /* Name of mailbox quota database */
char *quota_query = NULL;  /* SQL query to retrieve mailbox quota */

/* Debuggig options */
int debug_level;           /* General debugging level */ 
int debug_flags;           /* Mailutils debugging flags */
int sieve_debug_flags;     /* Sieve debugging flags */
int sieve_enable_log;      /* Enables logging of executed Sieve actions */
char *message_id_header;   /* Use the value of this header as message
			      identifier when logging Sieve actions */
mu_debug_t mudebug;        /* Mailutils debugging object */


#define MAXFD 64
#define EX_QUOTA() (ex_quota_tempfail ? EX_TEMPFAIL : EX_UNAVAILABLE)

void close_fds __P((void));
int make_tmp __P((const char *from, mailbox_t *mbx));
void deliver __P((mailbox_t msg, char *name));
void guess_retval __P((int ec));
void mailer_err __P((char *fmt, ...));
void notify_biff __P((mailbox_t mbox, char *name, size_t size));

const char *program_version = "mail.local (" PACKAGE_STRING ")";
static char doc[] =
/* TRANSLATORS: Please, preserve the vertical tabulation (^K character)
   in this message */
N_("GNU mail.local -- the local MDA\
\v\
Debug flags are:\n\
  g - guimb stack traces\n\
  T - mailutils traces (MU_DEBUG_TRACE)\n\
  P - network protocols (MU_DEBUG_PROT)\n\
  t - sieve trace (MU_SIEVE_DEBUG_TRACE)\n\
  i - sieve instructions trace (MU_SIEVE_DEBUG_INSTR)\n\
  l - sieve action logs\n\
  0-9 - Set mail.local debugging level\n");

static char args_doc[] = N_("recipient [recipient ...]");

#define ARG_MULTIPLE_DELIVERY 1
#define ARG_QUOTA_TEMPFAIL    2
#define ARG_MESSAGE_ID_HEADER 3
#define ARG_QUOTA_QUERY       4

static struct argp_option options[] = 
{
  { "ex-multiple-delivery-success", ARG_MULTIPLE_DELIVERY, NULL, 0,
    N_("Do not return errors when delivering to multiple recipients"), 0 },
  { "ex-quota-tempfail", ARG_QUOTA_TEMPFAIL, NULL, 0,
    N_("Return temporary failure if disk or mailbox quota is exceeded"), 0 },
  { "from", 'f', N_("EMAIL"), 0,
    N_("Specify the sender's name") },
  { NULL, 'r', NULL, OPTION_ALIAS, NULL },
#ifdef USE_DBM
  { "quota-db", 'q', N_("FILE"), 0,
    N_("Specify path to quota DBM database"), 0 },
#endif
#ifdef USE_SQL
  { "quota-query", ARG_QUOTA_QUERY, N_("STRING"), 0,
    N_("SQL query to retrieve mailbox quota"), 0 },
#endif
  { "sieve", 'S', N_("PATTERN"), 0,
    N_("Set name pattern for user-defined Sieve mail filters"), 0 },
  { "message-id-header", ARG_MESSAGE_ID_HEADER, N_("STRING"), 0,
    N_("Identify messages by the value of this header when logging Sieve actions"), 0 },
#ifdef WITH_GUILE
  { "source", 's', N_("PATTERN"), 0,
    N_("Set name pattern for user-defined Scheme mail filters"), 0 },
#endif
  { "debug", 'x', N_("FLAGS"), 0,
    N_("Enable debugging"), 0 },
  { NULL,      0, NULL, 0, NULL, 0 }
};

static error_t parse_opt (int key, char *arg, struct argp_state *state);

static struct argp argp = {
  options,
  parse_opt,
  args_doc, 
  doc,
  NULL,
  NULL, NULL
};

static const char *argp_capa[] = {
  "auth",
  "common",
  "license",
  "logging",
  "mailbox",
  "mailer",
  "sieve",
  NULL
};

char *from = NULL;
char *progfile_pattern = NULL;
char *sieve_pattern = NULL;

#define D_DEFAULT "9s"

static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  switch (key)
    {
    case ARG_MULTIPLE_DELIVERY:
      multiple_delivery = 1;
      break;

    case ARG_QUOTA_TEMPFAIL:
      ex_quota_tempfail = 1;
      break;

    case ARG_MESSAGE_ID_HEADER:
      message_id_header = arg;
      break;

    case ARG_QUOTA_QUERY:
      quota_query = arg;
      break;
      
    case 'r':
    case 'f':
      if (from != NULL)
	{
	  argp_error (state, _("Multiple --from options"));
	  return EX_USAGE;
	}
      from = arg;
      break;
      
#ifdef USE_DBM
    case 'q':
      quotadbname = arg;
      break;
#endif

#ifdef WITH_GUILE	
    case 's':
      progfile_pattern = arg;
      break;
#endif

    case 'S':
      sieve_pattern = arg;
      break;
      
    case 'x':
      do
	{
	  if (!arg)
	    arg = D_DEFAULT;
	  switch (*arg)
	    {
	    case 'g':
#ifdef WITH_GUILE
	      debug_guile = 1;
#endif
	      break;

	    case 't':
	      sieve_debug_flags |= MU_SIEVE_DEBUG_TRACE;
	      break;

	    case 'i':
	      sieve_debug_flags |= MU_SIEVE_DEBUG_INSTR;
	      break;
	      
	    case 'l':
	      sieve_enable_log = 1;
	      break;
	      
	    case 'T':
	      debug_flags |= MU_DEBUG_TRACE;
	      break;

	    case 'P':
	      debug_flags |= MU_DEBUG_PROT;
	      break;

	    default:
	      if (isdigit (*arg))
		debug_level = *arg - '0';
	      else
		argp_error (state, _("%c is not a valid debug flag"), *arg);
	      break;
	    }
	}
      while (*++arg);
      break;
      
    default:
      return ARGP_ERR_UNKNOWN;

    case ARGP_KEY_ERROR:
      exit (EX_USAGE);
    }
  return 0;
}


static int
_mu_debug_printer (mu_debug_t unused, size_t level, const char *fmt,
		   va_list ap)
{
  vsyslog ((level == MU_DEBUG_ERROR) ? LOG_ERR : LOG_DEBUG, fmt, ap);
  return 0;
}

static int
_sieve_debug_printer (void *unused, const char *fmt, va_list ap)
{
  vsyslog (LOG_DEBUG, fmt, ap);
  return 0;
}

static void
_sieve_action_log (void *user_name,
		   const sieve_locus_t *locus, size_t msgno, message_t msg,
		   const char *action, const char *fmt, va_list ap)
{
  char *text = NULL;
  
  if (message_id_header)
    {
      header_t hdr = NULL;
      char *val = NULL;
      message_get_header (msg, &hdr);
      if (header_aget_value (hdr, message_id_header, &val) == 0
	  || header_aget_value (hdr, MU_HEADER_MESSAGE_ID, &val) == 0)
	{
	  asprintf (&text, _("%s:%lu: %s on msg %s"),
		    locus->source_file,
		    (unsigned long) locus->source_line,
		    action, val);
	  free (val);
	}
    }
  if (text == NULL)
    {
      size_t uid = 0;
      message_get_uid (msg, &uid);
      asprintf (&text, _("%s:%lu: %s on msg uid %d"),
		locus->source_file,
		(unsigned long)	locus->source_line,
		action, uid);
    }
  
  if (fmt && strlen (fmt))
    {
      char *diag = NULL;
      vasprintf (&diag, fmt, ap);
      syslog (LOG_NOTICE, _("(user %s) %s: %s"), (char*) user_name, text, diag);
      free (diag);
    }
  else
    syslog (LOG_NOTICE, _("(user %s) %s"), (char*) user_name, text);
  free (text);
}

static int
_sieve_parse_error (void *user_name, const char *filename, int lineno,
		    const char *fmt, va_list ap)
{
  char *text;
  vasprintf (&text, fmt, ap);
  if (filename)
    {
      char *loc;
      asprintf (&loc, "%s:%d: ", filename, lineno);
      syslog (LOG_ERR, "%s: %s", loc, text);
      free (loc);
    }
  else
    syslog (LOG_ERR, _("(user %s) %s"), (char*)user_name, text);
  free (text);
  return 0;
}

int
main (int argc, char *argv[])
{
  mailbox_t mbox = NULL;
  int arg_index;
  
  /* Preparative work: close inherited fds, force a reasonable umask
     and prepare a logging. */
  close_fds ();
  umask (0077);

  /* Native Language Support */
  mu_init_nls ();

  /* Default locker settings */
  locker_set_default_flags (MU_LOCKER_PID|MU_LOCKER_RETRY,
			    mu_locker_set_flags);
  locker_set_default_retry_timeout (1);
  locker_set_default_retry_count (300);

  /* Default error code for command line errors */
  mu_argp_error_code = EX_CONFIG;
  /* Register needed modules */
  MU_AUTH_REGISTER_ALL_MODULES();
  mu_argp_init (program_version, NULL);
  sieve_argp_init ();
  /* Parse command line */
  mu_argp_parse (&argp, &argc, &argv, 0, argp_capa, &arg_index, NULL);
  
  openlog ("mail.local", LOG_PID, log_facility);
  mu_error_set_print (mu_syslog_error_printer);
  if (debug_flags)
    {
      int rc;
      
      if ((rc = mu_debug_create (&mudebug, NULL)))
	{
	  mu_error (_("mu_debug_create failed: %s\n"), mu_strerror (rc));
	  exit (EX_TEMPFAIL);
	}
      if ((rc = mu_debug_set_level (mudebug, debug_flags)))
	{
	  mu_error (_("mu_debug_set_level failed: %s\n"),
		    mu_strerror (rc));
	  exit (EX_TEMPFAIL);
	}
      if ((rc = mu_debug_set_print (mudebug, _mu_debug_printer, NULL)))
	{
	  mu_error (_("mu_debug_set_print failed: %s\n"),
		    mu_strerror (rc));
	  exit (EX_TEMPFAIL);
	}
    }
  
  uid = getuid ();

  argc -= arg_index;
  argv += arg_index;

  if (!argc)
    {
      mu_error (_("Missing arguments. Try --help for more info."));
      return EX_USAGE;
    }

  /* Register local mbox formats. */
  {
    list_t bookie;
    registrar_get_list (&bookie);
    list_append (bookie, mbox_record); 
    list_append (bookie, path_record);
    /* Possible supported mailers.  */
    list_append (bookie, sendmail_record);
    list_append (bookie, smtp_record);
  }

  if (make_tmp (from, &mbox))
    exit (exit_code);
  
  if (multiple_delivery)
    multiple_delivery = argc > 1;

#ifdef WITH_GUILE
  if (progfile_pattern)
    {
      struct mda_data mda_data;
      
      memset (&mda_data, 0, sizeof mda_data);
      mda_data.mbox = mbox;
      mda_data.argv = argv;
      mda_data.progfile_pattern = progfile_pattern;
      return prog_mda (&mda_data);
    }
#endif
  
  for (; *argv; argv++)
    mda (mbox, *argv);
  return exit_code;
}

int
sieve_test (struct mu_auth_data *auth, mailbox_t mbx)
{
  int rc = 1;
  char *progfile;
    
  if (!sieve_pattern)
    return 1;

  progfile = mu_expand_path_pattern (sieve_pattern, auth->name);
  if (access (progfile, R_OK))
    {
      if (debug_level > 2)
	syslog (LOG_DEBUG, _("Access to %s failed: %m"), progfile);
    }
  else
    {
      sieve_machine_t mach;
      rc = sieve_machine_init (&mach, auth->name);
      if (rc)
	{
	  mu_error (_("Cannot initialize sieve machine: %s"),
		    mu_strerror (rc));
	}
      else
	{
	  sieve_set_debug (mach, _sieve_debug_printer);
	  sieve_set_debug_level (mach, mudebug, sieve_debug_flags);
	  sieve_set_parse_error (mach, _sieve_parse_error);
	  if (sieve_enable_log)
	    sieve_set_logger (mach, _sieve_action_log);
	  
	  rc = sieve_compile (mach, progfile);
	  if (rc == 0)
	    {
	      attribute_t attr;
	      message_t msg = NULL;
		
	      mailbox_get_message (mbx, 1, &msg);
	      message_get_attribute (msg, &attr);
	      attribute_unset_deleted (attr);
	      if (switch_user_id (auth, 1) == 0)
		{
		  chdir (auth->dir);
		
		  rc = sieve_message (mach, msg);
		  if (rc == 0)
		    rc = attribute_is_deleted (attr) == 0;

		  switch_user_id (auth, 0);
		  chdir ("/");
		}
	      sieve_machine_destroy (&mach);
	    }
	}
    }
  free (progfile);
  return rc;
}

int
mda (mailbox_t mbx, char *username)
{
  deliver (mbx, username);

  if (multiple_delivery)
    exit_code = EX_OK;

  return exit_code;
}

void
close_fds ()
{
  int i;
  long fdlimit = MAXFD;

#if defined (HAVE_SYSCONF) && defined (_SC_OPEN_MAX)
  fdlimit = sysconf (_SC_OPEN_MAX);
#elif defined (HAVE_GETDTABLESIZE)
  fdlimit = getdtablesize ();
#endif

  for (i = 3; i < fdlimit; i++)
    close (i);
}

int
switch_user_id (struct mu_auth_data *auth, int user)
{
  int rc;
  uid_t uid;
  
  if (!auth || auth->change_uid == 0)
    return 0;
  
  if (user)
    uid = auth->uid;
  else
    uid = 0;
  
#if defined(HAVE_SETREUID)
  rc = setreuid (0, uid);
#elif defined(HAVE_SETRESUID)
  rc = setresuid (-1, uid, -1);
#elif defined(HAVE_SETEUID)
  rc = seteuid (uid);
#else
# error "No way to reset user privileges?"
#endif
  if (rc < 0)
    mailer_err ("setreuid(0, %d): %s (r=%d, e=%d)",
		uid, strerror (errno), getuid (), geteuid ());
  return rc;
}

static int
tmp_write (stream_t stream, off_t *poffset, char *buf, size_t len)
{
  size_t n = 0;
  int status = stream_write (stream, buf, len, *poffset, &n);
  if (status == 0 && n != len)
    status = EIO;
  *poffset += n;
  return status;
}

int
make_tmp (const char *from, mailbox_t *mbox)
{
  stream_t stream;
  char *buf = NULL;
  size_t n = 0;
  off_t offset = 0;
  size_t line;
  int status;
  static char *newline = "\n";
  char *tempfile;
  
  tempfile = mu_tempname (NULL);
  if ((status = file_stream_create (&stream, tempfile, MU_STREAM_RDWR)))
    {
      mailer_err (_("Unable to open temporary file: %s"), mu_strerror (status));
      exit (exit_code);
    }

  if ((status = stream_open (stream)))
    {
      mailer_err (_("unable to open temporary file: %s"), mu_strerror (status));
      exit (exit_code);
    }
  
  line = 0;
  while (getline (&buf, &n, stdin) > 0)
    {
      line++;
      if (line == 1)
	{
	  if (memcmp (buf, "From ", 5))
	    {
	      struct mu_auth_data *auth = NULL;
	      if (!from)
		{
		  auth = mu_get_auth_by_uid (uid);
		  if (auth)
		    from = auth->name;
		}
	      if (from)
		{
		  time_t t;
		  char *ptr;
		  
		  time (&t);
		  asprintf (&ptr, "From %s %s", from, ctime (&t));
		  status = tmp_write (stream, &offset, ptr, strlen (ptr));
		  free (ptr);
		}
	      else
		{
		  mailer_err (_("Cannot determine sender address"));
		  exit (EX_UNAVAILABLE);
		}
	      if (auth)
		mu_auth_data_free (auth);
	    }
	}
      else if (!memcmp (buf, "From ", 5))
	{
	  static char *escape = ">";
	  status = tmp_write (stream, &offset, escape, 1);
	}

      if (!status)
	status = tmp_write (stream, &offset, buf, strlen (buf));
      
      if (status)
	{
	  mailer_err (_("Error writing temporary file: %s"), mu_strerror (status));
	  stream_destroy (&stream, stream_get_owner (stream));
	  return status;
	}
    }
  
  if (buf && strchr (buf, '\n') == NULL)
    status = tmp_write (stream, &offset, newline, 1);

  status = tmp_write (stream, &offset, newline, 1);
  free (buf);
  unlink (tempfile);
  free (tempfile);
  
  if (status)
    {
      errno = status;
      mailer_err (_("Error writing temporary file: %s"), mu_strerror (status));
      stream_destroy (&stream, stream_get_owner (stream));
      return status;
    }

  stream_flush (stream);
  if ((status = mailbox_create (mbox, "/dev/null")) 
      || (status = mailbox_open (*mbox, MU_STREAM_READ))
      || (status = mailbox_set_stream (*mbox, stream)))
    {
      mailer_err (_("Error opening temporary file: %s"), mu_strerror (status));
      stream_destroy (&stream, stream_get_owner (stream));
      return status;
    }

  status = mailbox_messages_count (*mbox, &n);
  if (status)
    {
      errno = status;
      mailer_err (_("Error creating temporary message: %s"),
		  mu_strerror (status));
      stream_destroy (&stream, stream_get_owner (stream));
      return status;
    }

  return status;
}

void
deliver (mailbox_t imbx, char *name)
{
  mailbox_t mbox;
  char *path;
  url_t url = NULL;
  locker_t lock;
  struct mu_auth_data *auth;
  int status;
  stream_t istream, ostream;
  off_t size;
  int failed = 0;
  
  auth = mu_get_auth_by_name (name);
  if (!auth)
    {
      mailer_err (_("%s: no such user"), name);
      exit_code = EX_UNAVAILABLE;
      return;
    }

  if (!sieve_test (auth, imbx))
    {
      exit_code = EX_OK;
      mu_auth_data_free (auth);
      return;
    }

  if ((status = mailbox_get_stream (imbx, &istream)) != 0)
    {
      mailer_err (_("Cannot get input message stream: %s"),
		  mu_strerror (status));
      mu_auth_data_free (auth);
      return;
    }
  
  if ((status = mailbox_create (&mbox, auth->mailbox)) != 0)
    {
      mailer_err (_("Cannot open mailbox %s: %s"),
		  auth->mailbox, mu_strerror (status));
      mu_auth_data_free (auth);
      return;
    }

  mailbox_get_url (mbox, &url);
  path = (char*) url_to_string (url);

  /* Actually open the mailbox. Switch to the user's euid to make
     sure the maildrop file will have right privileges, in case it
     will be created */
  if (switch_user_id (auth, 1))
    return;
  status = mailbox_open (mbox, MU_STREAM_RDWR|MU_STREAM_CREAT);
  if (switch_user_id (auth, 0))
    return;
  if (status != 0)
    {
      mailer_err (_("Cannot open mailbox %s: %s"), path, mu_strerror (status));
      mailbox_destroy (&mbox);
      return;
    }
  
  mailbox_get_locker (mbox, &lock);

  status = locker_lock (lock);

  if (status)
    {
      mailer_err (_("Cannot lock mailbox `%s': %s"), path, mu_strerror (status));
      mailbox_destroy (&mbox);
      exit_code = EX_TEMPFAIL;
      return;
    }

  if ((status = mailbox_get_stream (mbox, &ostream)))
    {
      mailer_err (_("Cannot get stream for mailbox %s: %s"),
		  path, mu_strerror (status));
      mailbox_destroy (&mbox);
      return;
    }

  if ((status = stream_size (ostream, &size)))
    {
      mailer_err (_("Cannot get stream size (mailbox %s): %s"),
		  path, mu_strerror (status));
      mailbox_destroy (&mbox);
      return;
    }

#if defined(USE_MAILBOX_QUOTAS)
  {
    size_t n;
    off_t isize;

    switch (check_quota (name, size, &n))
      {
      case MQUOTA_EXCEEDED:
	mailer_err (_("%s: mailbox quota exceeded for this recipient"), name);
	exit_code = EX_QUOTA();
	failed++;
	break;
	
      case MQUOTA_UNLIMITED:
	break;
	
      default:
	if ((status = stream_size (istream, &isize)))
	  {
	    mailer_err (_("Cannot get stream size (input message): %s"),
			path, mu_strerror (status));
	    exit_code = EX_UNAVAILABLE;
	    failed++;
	  }
	else if (isize > n)
	  {
	    mailer_err (_("%s: message would exceed maximum mailbox size for this recipient"),
			name);
	    exit_code = EX_QUOTA();
	    failed++;
	  }
	break;
      }
  }
#endif
  
  if (!failed && switch_user_id (auth, 1) == 0)
    {
      off_t ioff = 0;
      off_t off = size;
      size_t nwr, nrd;
      char *buf = NULL;
      off_t bufsize = 1024;

      stream_size (istream, &bufsize);
      for (; (buf = malloc (bufsize)) == NULL && bufsize > 1; bufsize /= 2)
	;
      
      if (!buf)
	{
	  status = errno = ENOMEM;
	  failed++;
	}
      else
	{
	  status = 0;

	  while ((status = stream_read (istream, buf, bufsize, ioff, &nrd))
		 == 0
		 && nrd > 0)
	    {
	      status = stream_write (ostream, buf, nrd, off, &nwr);
	      if (status)
		break;
	      ioff += nrd;
	      off += nwr;
	    }
	  
	  free (buf);
	}
      
      switch_user_id (auth, 0);

      if (status)
	{
	  /* Undo the delivery by truncating the mailbox back to its
	     original size */
	  int rc = stream_truncate (ostream, size);
	  if (rc)
	    mailer_err (_("Error writing to mailbox: %s. Mailbox NOT truncated: %s"),
			mu_strerror (status), mu_strerror (rc));
	  else  
	    mailer_err (_("Error writing to mailbox: %s"),
	  	        mu_strerror (status));
	}
    }

  if (!failed)
    notify_biff (mbox, name, size);

  locker_unlock (lock);

  mu_auth_data_free (auth);
  mailbox_close (mbox);
  mailbox_destroy (&mbox);
}

void
notify_biff (mailbox_t mbox, char *name, size_t size)
{
  static int fd = -1;
  url_t url = NULL;
  char *buf = NULL;
  static struct sockaddr_in inaddr;
    
  if (fd == -1)
    {
      struct servent *sp;
      
      if ((sp = getservbyname ("biff", "udp")) == NULL)
	return;

      inaddr.sin_family = AF_INET;
      inaddr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
      inaddr.sin_port = sp->s_port;
      
      fd = socket (PF_INET, SOCK_DGRAM, 0);
      if (fd < 0)
	fd = -2; /* Mark failed initialization */
    }

  if (fd < 0)
    return;
  
  mailbox_get_url (mbox, &url);
  asprintf (&buf, "%s@%ld:%s", name, size, url_to_string (url));
  if (buf)
    {
      sendto (fd, buf, strlen (buf), 0, (struct sockaddr *)&inaddr,
	      sizeof inaddr);
      free (buf);
    }
}

void
mailer_err (char *fmt, ...)
{
  va_list ap;

  guess_retval (errno);
  va_start (ap, fmt);
  vfprintf (stderr, fmt, ap);
  fprintf (stderr, "\n");
  mu_verror (fmt, ap);
  va_end (ap);
}

int temp_errors[] = {
#ifdef EAGAIN
  EAGAIN, /* Try again */
#endif
#ifdef EBUSY
  EBUSY, /* Device or resource busy */
#endif
#ifdef EPROCLIM
  EPROCLIM, /* Too many processes */
#endif
#ifdef EUSERS
  EUSERS, /* Too many users */
#endif
#ifdef ECONNABORTED
  ECONNABORTED, /* Software caused connection abort */
#endif
#ifdef ECONNREFUSED
  ECONNREFUSED, /* Connection refused */
#endif
#ifdef ECONNRESET
  ECONNRESET, /* Connection reset by peer */
#endif
#ifdef EDEADLK
  EDEADLK, /* Resource deadlock would occur */
#endif
#ifdef EDEADLOCK
  EDEADLOCK, /* Resource deadlock would occur */
#endif
#ifdef EFBIG
  EFBIG, /* File too large */
#endif
#ifdef EHOSTDOWN
  EHOSTDOWN, /* Host is down */
#endif
#ifdef EHOSTUNREACH
  EHOSTUNREACH, /* No route to host */
#endif
#ifdef EMFILE
  EMFILE, /* Too many open files */
#endif
#ifdef ENETDOWN
  ENETDOWN, /* Network is down */
#endif
#ifdef ENETUNREACH
  ENETUNREACH, /* Network is unreachable */
#endif
#ifdef ENETRESET
  ENETRESET, /* Network dropped connection because of reset */
#endif
#ifdef ENFILE
  ENFILE, /* File table overflow */
#endif
#ifdef ENOBUFS
  ENOBUFS, /* No buffer space available */
#endif
#ifdef ENOMEM
  ENOMEM, /* Out of memory */
#endif
#ifdef ENOSPC
  ENOSPC, /* No space left on device */
#endif
#ifdef EROFS
  EROFS, /* Read-only file system */
#endif
#ifdef ESTALE
  ESTALE, /* Stale NFS file handle */
#endif
#ifdef ETIMEDOUT
  ETIMEDOUT,  /* Connection timed out */
#endif
#ifdef EWOULDBLOCK
  EWOULDBLOCK, /* Operation would block */
#endif
};
  

void
guess_retval (int ec)
{
  int i;
  /* Temporary failures override hard errors. */
  if (exit_code == EX_TEMPFAIL)
    return;
#ifdef EDQUOT
  if (ec == EDQUOT)
    {
      exit_code = EX_QUOTA();
      return;
    }
#endif

  for (i = 0; i < sizeof (temp_errors)/sizeof (temp_errors[0]); i++)
    if (temp_errors[i] == ec)
      {
	exit_code = EX_TEMPFAIL;
	return;
      }
  exit_code = EX_UNAVAILABLE;
}

Return to:

Send suggestions and report system problems to the System administrator.