aboutsummaryrefslogtreecommitdiff
path: root/pies/pies.c
blob: bdca2a4839dff61253aa5b4f4b31e104404b122d (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
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
/* This file is part of Mailfromd.
   Copyright (C) 2008 Sergey Poznyakoff

   This program 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 3, or (at your option)
   any later version.

   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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

#include "pies.h"

int log_to_stderr;  /* Use stderr for logging */
char *log_tag; /* override mu_log_tag */
mu_log_level_t debug_level;
mu_debug_t pmult_debug;
struct pies_privs_data pies_user;
int foreground;
int command;
char *pidfile = STATEDIR "/pies.pid";
char *ctlfile = STATEDIR "/pies.ctl";
char *statfile = STATEDIR "/pies.stat";
mode_t pies_umask = 0;
unsigned long shutdown_timeout = 5;


/* Logging */
void
log_setup (int want_stderr)
{
  mu_debug_t debug;

  mu_diag_get_debug (&debug);

  if (log_tag)
    mu_log_tag = log_tag;
  
  if (!want_stderr)
    {
      openlog (MU_LOG_TAG (), LOG_PID, mu_log_facility);
      mu_debug_set_print (debug, mu_diag_syslog_printer, NULL);
      mu_debug_default_printer = mu_debug_syslog_printer;
    }
  else
    mu_debug_default_printer = mu_debug_stderr_printer;
}
  
static int
stderr_closed_p()
{
  int fd = dup (0);
  if (fd < 0)
    return 1;
  close (fd);
  return fd <= 2;
}


static int
_cb_action (mu_debug_t debug, void *data, char *arg)
{
  enum return_action *pact = data;
  static struct mu_kwd actab[] = {
    { "disable", action_disable },
    { "restart", action_restart },
    { NULL }
  };
  int res;
  
  if (mu_kwd_xlat_name (actab, arg, &res))
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   _("unknown action code: %s"), arg);
      return 0;
    }
  *pact = res;
  return 0;
}

static int
_cb_notify_addr (mu_debug_t debug, void *data, char *arg)
{
  mu_address_t *paddr = data;
  mu_address_t addr;
  int rc;

  rc = mu_address_create (&addr, arg);
  if (rc)
    mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			 _("%s: invalid e-mail address: %s"),
			 arg, mu_strerror (rc));
  if (*paddr)
    {
      mu_address_union (paddr, addr);
      mu_address_destroy (&addr);
    }
  else
    *paddr = addr;
  return 0;
}

struct mu_cfg_param return_code_cfg_param[] = {
  { "action", mu_cfg_callback, NULL,
    mu_offsetof (struct action, act), _cb_action,
    N_("Specifies action to take when a component finishes with this "
       "return code."),
    N_("arg: {disable | restart}") },
  { "notify", mu_cfg_callback, NULL,
    mu_offsetof (struct action, addr), _cb_notify_addr,
    N_("Notify this address when then component terminates."),
    N_("arg: email-list") },
  { "message", mu_cfg_string, NULL,
    mu_offsetof (struct action, message), NULL,
    N_("Notification message text (with headers).") },
  { NULL }
};

static struct mu_kwd ex_kwtab[] = {
#define S(s) { #s, s }
  S (EX_OK),
  S (EX_USAGE),
  S (EX_DATAERR),
  S (EX_NOINPUT),
  S (EX_NOUSER),
  S (EX_NOHOST),
  S (EX_UNAVAILABLE),
  S (EX_SOFTWARE),
  S (EX_OSERR),
  S (EX_OSFILE),
  S (EX_CANTCREAT),
  S (EX_IOERR),
  S (EX_TEMPFAIL),
  S (EX_PROTOCOL),
  S (EX_NOPERM),
  S (EX_CONFIG),
  { NULL }
};

static int
return_code_section_parser (enum mu_cfg_section_stage stage,
			    const mu_cfg_node_t *node,
			    const char *section_label, void **section_data,
			    void *call_data,
			    mu_cfg_tree_t *tree)
{
  struct component *comp = *section_data;
  struct action *act;
  int argc, i;
  char **argv;
  int *retv;
  int retc = 0;
  int allflag = 0;
  int rc;
  
  switch (stage)
    {
    case mu_cfg_section_start:
      rc = mu_argcv_get (node->tag_label, NULL, NULL, &argc, &argv);
      if (rc)
	{
	  mu_cfg_format_error (tree->debug, MU_DEBUG_ERROR,
			       _("cannot parse return codes: %s"),
			       mu_strerror (rc));
	  return 1;
	}
      retv = xcalloc (argc, sizeof *retv);
      if (argc == 0 || (argc == 1 && strcmp (argv[0], "*") == 0))
	allflag = 1;
      else
	{
	  for (i = 0; i < argc; i++)
	    {
	      int n;

	      if (isdigit (argv[i][0]))
		{
		  char *p;
		  n = strtoul (argv[i], &p, 0);
		  if (*p)
		    {
		      mu_cfg_format_error (tree->debug, MU_DEBUG_ERROR,
					   _("%s: not a number"), p);
		      continue;
		    }
		}
	      else if (mu_kwd_xlat_name_ci (ex_kwtab, argv[i], &n))
		{
		  mu_cfg_format_error (tree->debug, MU_DEBUG_ERROR,
				       _("%s: not a return code"), argv[i]);
		  continue;
		}		  
	      
	      if (n > MAX_RETURN_CODE)
		mu_cfg_format_error (tree->debug, MU_DEBUG_ERROR,
				     _("%s: invalid return code"), argv[i]);
	      else
		{
		  /* Alles in ordnung */
		  retv[retc++] = n;
	      }
	    }
	}
      
      mu_argcv_free (argc, argv);
      if (retc == 0 && !allflag)
	{
	  free (retv);
	  return 1;
	}

      act = xzalloc (sizeof *act);
      if (allflag)
	{
	  for (i = 0; i <= MAX_RETURN_CODE; i++)
	    if (comp->act[i] == NULL)
	      comp->act[i] = act;
	}
      else
	for (i = 0; i < retc; i++)
	  comp->act[retv[i]] = act;
      *section_data = act;
      break;

    case mu_cfg_section_end:
      break;
    }
  return 0;
}

void
return_code_cfg_init ()
{
  struct mu_cfg_section *section;

  if (mu_create_canned_section ("return-code", &section))
    exit (EX_SOFTWARE);
  section->parser = return_code_section_parser;
  section->label = N_("<tag: exit-code-list>");
  mu_cfg_section_add_params (section, return_code_cfg_param);
}


static int
_cb_group (mu_debug_t debug, void *data, char *arg)
{
  int argc, i;
  char **argv;
  mu_list_t *plist = data, list;
  int rc;

  rc = mu_argcv_get_np (arg, strlen (arg), ",", NULL, 0, &argc, &argv, NULL);
  if (rc)
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   "mu_argcv_get: %s", mu_strerror (rc));
      return 1;
    }
  if (*plist)
    list = *plist;
  else
    {
      mu_list_create (&list);
      *plist = list;
    }
  for (i = 0; i < argc; i++)
    {
      struct group *group = getgrnam (argv[i]);
      if (!group)
	{
	  mu_cfg_format_error (debug, MU_DEBUG_ERROR, _("Unknown group: %s"),
			       argv[i]);
	  continue;
	}
      mu_list_append (list, (void*)group->gr_gid);
    }
  mu_argcv_free (argc, argv);
  return 0;
}


static int
_cb_command (mu_debug_t debug, void *data, char *arg)
{
  int argc;
  char **argv, ***pargv = data;
  int rc;

  rc = mu_argcv_get (arg, "", NULL, &argc, &argv);
  if (rc)
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   "mu_argcv_get: %s", mu_strerror (rc));
      return 1;
    }
  *pargv = argv;
  return 0;
}
  
static int
_cb_depend (mu_debug_t debug, void *data, char *arg)
{
  int argc;
  char **argv, ***pargv = data;
  int rc;

  rc = mu_argcv_get_np (arg, strlen (arg), ",", NULL, 0, &argc, &argv, NULL);
  if (rc)
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   "mu_argcv_get: %s", mu_strerror (rc));
      return 1;
    }
  *pargv = argv;
  return 0;
}
  
static int
_cb_umask (mu_debug_t debug, void *data, char *arg)
{
  mode_t *pmode = data;
  char *p;
  unsigned long n = strtoul (arg, &p, 8);
  if (*p)
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   _("Invalid octal number"));
      return 1;
    }
  *pmode = n;
  return 0;
}

static int
_cb_env (mu_debug_t debug, void *data, char *arg)
{
  int rc;
  int argc;
  char **argv;
  char ***penv = data;
  
  rc = mu_argcv_get_np (arg, strlen (arg), "", NULL, 0, &argc, &argv, NULL);
  if (rc)
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   "mu_argcv_get: %s", mu_strerror (rc));
      return 1;
    }
  *penv = argv;
  return 0;
}

static int
_cb_retr (mu_debug_t debug, void *data, char *arg)
{
  if (mu_string_to_syslog_priority (arg, data))
    {
      mu_cfg_format_error (debug, MU_DEBUG_ERROR,
			   _("Unknown syslog facility `%s'"),
			   arg);
      return 1;
    }
  return 0;
}

struct mu_cfg_param component_cfg_param[] = {
  { "command", mu_cfg_callback, NULL,
    mu_offsetof (struct component, argv), _cb_command,
    N_("Command line.") },
  { "depend", mu_cfg_callback, NULL,
    mu_offsetof (struct component, depend), _cb_depend,
    N_("List of dependenices (whitespace separated)"),
    N_("list") },
  { "disable", mu_cfg_bool, NULL,
    mu_offsetof (struct component, disabled), NULL,
    N_("Disable this entry.") },
  { "remove-file", mu_cfg_string, NULL,
    mu_offsetof (struct component, rmfile), NULL,
    N_("Remove file before starting the component.")
    N_("file") },
  { "stdout", mu_cfg_callback, NULL,
    mu_offsetof (struct component, retr[RETR_OUT]), _cb_retr,
    N_("Redirect program's standard output to the given syslog priority."),
    N_("prio: {emerg | alert | crit | err | warning | notice | info | debug}")
  },
  { "stderr", mu_cfg_callback, NULL,
    mu_offsetof (struct component, retr[RETR_ERR]), _cb_retr,
    N_("Redirect program's standard output to the given syslog priority."),
    N_("prio: {emerg | alert | crit | err | warning | notice | info | debug}")
  },
  { "user", mu_cfg_string, NULL,
    mu_offsetof (struct component, privs.user), NULL,
    N_("Run with this user privileges.") },
  { "group", mu_cfg_callback, NULL,
    mu_offsetof (struct component, privs.groups), _cb_group,
    N_("Retain supplementary group.") },
  { "umask", mu_cfg_callback, NULL,
    mu_offsetof (struct component, umask), _cb_umask,
    N_("Force this umask."),
    N_("arg: number") },
  { "env", mu_cfg_callback, NULL,
    mu_offsetof (struct component, env), _cb_env,
    N_("Set program environment.  Argument is a list of assignments "
       "separated by white space."),
    N_("arg: list") },
  { "chdir", mu_cfg_string, NULL,
    mu_offsetof (struct component, dir), NULL,
    N_("Change to this directory before executing the component."),
    N_("dir") },
  { "return-code", mu_cfg_section },
  { NULL }
};

static int
component_section_parser (enum mu_cfg_section_stage stage,
			  const mu_cfg_node_t *node,
			  const char *section_label, void **section_data,
			  void *call_data,
			  mu_cfg_tree_t *tree)
{
  static struct component comp;
  switch (stage)
    {
    case mu_cfg_section_start:
      memset (&comp, 0, sizeof comp);
      comp.retr[RETR_OUT] = comp.retr[RETR_ERR] = -1;
      comp.tag = node->tag_label ? xstrdup (node->tag_label) : NULL;
      *section_data = &comp;
      break;

    case mu_cfg_section_end:
      register_prog (&comp);
    }
  return 0;
}

void
component_cfg_init ()
{
  struct mu_cfg_section *section;

  if (mu_create_canned_section ("component", &section))
    exit (EX_SOFTWARE);
  section->parser = component_section_parser;
  section->label = N_("<tag: string>");
  mu_cfg_section_add_params (section, component_cfg_param);
}

    

struct component default_component;

static int
_cb_debug (mu_debug_t debug, void *data, char *arg)
{
  int rc;

  rc = mu_debug_level_from_string (arg, &debug_level, debug);
  if (rc)
    return 0;
  if (!pmult_debug)
    mu_debug_create (&pmult_debug, NULL);
  mu_debug_set_level (pmult_debug, debug_level);
  return 0;
}

struct mu_cfg_param pies_cfg_param[] = {
  { "component", mu_cfg_section },
  { "debug", mu_cfg_callback, NULL, 0, _cb_debug,
    N_("Set debug verbosity level.") },
  { "pidfile", mu_cfg_string, &pidfile, 0, NULL,
    N_("Write PID to this file.") },
  { "control-file", mu_cfg_string, &ctlfile, 0, NULL,
    N_("Set location of the control file.") },
  { "stat-file", mu_cfg_string, &statfile, 0, NULL,
    N_("Set location of the statistics output file.") },
  { "user", mu_cfg_string, &pies_user.user, 0, NULL,
    N_("Run with this user privileges.") },
  { "group", mu_cfg_callback, &pies_user.groups, 0, _cb_group,
    N_("Retain supplementary group.") },
  { "umask", mu_cfg_callback, &pies_umask, 0, _cb_umask,
    N_("Force this umask."),
    N_("arg: number") },
  { "shutdown-timeout", mu_cfg_uint, &shutdown_timeout, 0, NULL,
    N_("Wait <n> seconds for all children to shut down."),
    "n" },
  { "return-code", mu_cfg_section, &default_component },
  { NULL }
};


const char *program_version = "pies (" PACKAGE_STRING ")";
const char *package_bugreport = "<" PACKAGE_BUGREPORT ">";
static char doc[] = N_("pies -- process inspector and execution supervisor");
static char args_doc[] = "";

static const char *capa[] = {
  "common",
  "logging",
  "mailer",
  "debug",
  NULL
};

enum {
  OPT_FOREGROUND=256,
  OPTION_LOG_TAG,
  OPT_SYSLOG,
  OPT_STDERR
};

#define OPT_RESTART 'R'
#define OPT_RELOAD 'r'
#define OPT_STATUS 's'
#define OPT_STOP 'S'

static struct argp_option options[] = {
#define GRP 0
  { "foreground", OPT_FOREGROUND, 0, 0, N_("Remain in foreground."), GRP+1},
  { "stderr", OPT_STDERR, NULL, 0,  N_("Log to stderr"), },
  { "syslog", OPT_SYSLOG, NULL, 0,  N_("Log to syslog"), },
  { "log-tag", OPTION_LOG_TAG, N_("STRING"), 0,
    N_("Set the identifier used in syslog messages to STRING"), GRP+1 },
  { "debug", 'x', N_("LEVEL"), 0,
    N_("Set debug verbosity level."), GRP+1 },
#undef GRP

#define GRP 10
  { "restart-component", OPT_RESTART, NULL, 0,
    N_("Restart components named in the command line."), GRP+1 },
  { "reload", OPT_RELOAD, NULL, 0,
    N_("Reload the running instance of pies."), GRP+1 },
  { "hup", 0, NULL, OPTION_ALIAS },
  { "status", OPT_STATUS, NULL, 0,
    N_("Display info about the running instance."), GRP+1 },
  { "stop", OPT_STOP, NULL, 0,
    N_("Stop the running instance."), GRP+1 },
#undef GRP
  { NULL }
};

static error_t
parse_opt (int key, char *arg, struct argp_state *state)
{
  static struct mu_argp_node_list lst;
  
  switch (key)
    {
    case OPT_FOREGROUND:
      foreground = 1;
      break;
      
    case OPT_RELOAD:
    case OPT_STATUS:
    case OPT_STOP:
    case OPT_RESTART:  
      log_to_stderr = 1;
      command = key;
      break;
      
    case OPT_SYSLOG:
      log_to_stderr = 0;
      break;

    case OPT_STDERR:
      log_to_stderr = 1;
      break;

    case 'x':
      mu_argp_node_list_new (&lst, "debug", arg);
      break;
      
    case OPTION_LOG_TAG:
      log_tag = arg;
      break;
      
    case ARGP_KEY_INIT:
      mu_argp_node_list_init (&lst);
      break;

    case ARGP_KEY_FINI:
      mu_argp_node_list_finish (&lst, NULL, NULL);
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }
  return 0;
}

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


static void
version (FILE *stream, struct argp_state *state)
{
  mailfromd_version ("pies", stream);
}


void
priv_setup (struct pies_privs_data *pr)
{
  if (pr->user)
    {
      struct passwd *pw = getpwnam (pr->user);
      if (!pw)
	{
	  mu_error (_("No such user: %s"), pr->user);
	  exit (EX_CONFIG);
	}
      if (pw && switch_to_privs (pw->pw_uid, pw->pw_gid, pr->groups))
	exit (EX_SOFTWARE);
    }
}


#define ACTION_CONT       0
#define ACTION_STOP       1
#define ACTION_RESTART    2
#define ACTION_COMPRELOAD 3
#define ACTION_DUMPSTATS  4

int action = ACTION_CONT;
int children_cleanup = 0;
int got_alarm = 0;

RETSIGTYPE
sig_handler (int sig)
{
  switch (sig)
    {
    case SIGCHLD:
      children_cleanup = 1;
      break;

    case SIGTERM:
    case SIGINT:
    case SIGQUIT:
      action = ACTION_STOP;
      mu_diag_output (MU_DIAG_NOTICE, "received signal %d", sig);
      break;

    case SIGHUP:
      mu_diag_output (MU_DIAG_NOTICE, "received signal %d", sig);
      action = ACTION_RESTART;
      break;

    case SIGALRM:
      got_alarm = 1;
      break;

    case SIGUSR1:
      action = ACTION_COMPRELOAD;
      break;

    case SIGUSR2:
      action = ACTION_DUMPSTATS;
      break;
    }
  signal (sig, sig_handler);
}

void
signal_setup (RETSIGTYPE (*sf)(int))
{
  signal (SIGCHLD, sf);
  signal (SIGTERM, sf);
  signal (SIGQUIT, sf);
  signal (SIGINT, sf);
  signal (SIGHUP, sf);
  signal (SIGALRM, sf);
  signal (SIGUSR1, sf);
  signal (SIGUSR2, sf);
}


pid_t
pidfile_read (int must_exist)
{
  int c;
  pid_t n = 0;
  FILE *fp = fopen (pidfile, "r");
  if (!fp)
    {
      if (must_exist && errno != ENOENT)
	mu_diag_output (MU_DIAG_ERR,
			_("cannot open pid file `%s': %s"),
			pidfile,
			mu_strerror (errno));
      return -1;
    }

  while ((c = fgetc (fp)) != EOF)
    {
      if (isdigit (c))
	n = n * 10 + c - '0';
      else if (c == '\n')
	break;
      else
	{
	  mu_diag_output (MU_DIAG_ERR,
			  _("unexpected character %#03o in pidfile `%s'"),
			  c, pidfile);
	  return -1;
	}
    }
  fclose (fp);
  if (kill (n, 0))
    {
      mu_diag_output (MU_DIAG_ERR,
		      _("cannot signal master process %lu: %s"),
		      (unsigned long) n, mu_strerror (errno));
      if (errno == EPERM)
	return n; /* be on the safe side */
      return -1;
    }
  return n;
}


void
stop_components ()
{
  FILE *fp;
  size_t size = 0;
  char *buf = NULL;
  
  mu_diag_output (MU_DIAG_INFO, _("stopping components"));
  
  fp = fopen (ctlfile, "r");
  if (!fp)
    {
      mu_error (_("cannot open control file `%s': %s"),
		ctlfile, mu_strerror (errno));
      return;
    }
  if (unlink (ctlfile))
    {
      mu_error (_("cannot unlink control file `%s': %s"),
		ctlfile, mu_strerror (errno));
      fclose (fp);
      return;
    }
  
  while (getline (&buf, &size, fp) > 0)
    {
      size_t len = strlen (buf);
      if (len == 0)
	continue;
      if (buf[len-1] == '\n')
	buf[len-1] = 0;
      progman_stop_component (buf);
    }

  free (buf);
  fclose (fp);
}

int
request_restart_components (char **argv)
{
  FILE *fp;
  pid_t pid = pidfile_read (1);

  if (pid == -1)
    return 1;

  fp = fopen (ctlfile, "w");
  if (!fp)
    {
      mu_error (_("cannot open control file `%s': %s"),
		ctlfile, mu_strerror (errno));
      return 1;
    }
  for (; *argv; argv++)
    fprintf (fp, "%s\n", *argv);
  fclose (fp);

  kill (pid, SIGUSR1);
  return 0;
}


int
pies_reload ()
{
  pid_t pid = pidfile_read (1);

  if (pid == -1)
    {
      mu_diag_output (MU_DIAG_CRIT, _("pies is not running"));
      return 1;
    }
  
  mu_diag_output (MU_DIAG_INFO, _("reloading pies at PID %lu"),
		  (unsigned long) pid);
  return kill (pid, SIGHUP) ? EX_SOFTWARE : 0;
}
      
int
pies_status ()
{
  FILE *fp;
  pid_t pid = pidfile_read (0);
  int i;
  
  if (pid == -1)
    {
      mu_diag_output (MU_DIAG_INFO, _("pies is not running"));
      return EX_USAGE;
    }
  
  if (kill (pid, SIGUSR2))
    {
      mu_diag_output (MU_DIAG_INFO, 
		      _("pies is not running, but a pidfile "
			"is found (pid %lu)"),
		      (unsigned long) pid);
      return EX_USAGE;
    }
      
  mu_diag_output (MU_DIAG_INFO,
		  _("pies is running; PID %lu"),
		    (unsigned long) pid);

  for (i = 0; i < 4 && access (statfile, R_OK); i++)
    sleep (1);
  
  fp = fopen (statfile, "r");
  if (!fp)
    mu_diag_output (MU_DIAG_ERR, _("cannot open statfile `%s': %s"),
		    statfile, mu_strerror (errno));
  else
    {
      char c;

      if (unlink (statfile))
	mu_diag_output (MU_DIAG_ERR, _("cannot unlink statfile `%s': %s"),
			statfile, mu_strerror (errno));
      while ((c = fgetc (fp)) != EOF)
	fputc (c, stdout);
      fclose (fp);
    }
  return 0;
}

int
pies_stop ()
{
  pid_t pid = pidfile_read (1);

  if (pid == -1)
    {
      mu_diag_output (MU_DIAG_CRIT, _("pies is not running"));
      return EX_USAGE;
    }
  
  mu_diag_output (MU_DIAG_INFO,
		  _("stopping pies at PID %lu"), (unsigned long) pid);
  return kill (pid, SIGTERM) ? EX_SOFTWARE : 0;
}


int
main (int argc, char **argv)
{
  int rc;
  int index;
  
  mf_init_nls ();
  if (!program_invocation_short_name)
    program_invocation_short_name = argv[0];
  argp_program_version_hook = version;
  /* Set default logging */
  log_setup (!stderr_closed_p ());
  return_code_cfg_init ();
  component_cfg_init ();
  mu_argp_init (program_version, package_bugreport);
  mu_register_all_mailer_formats ();
  rc = mu_app_init (&argp, capa, pies_cfg_param, argc, argv, 0, &index, NULL);
  if (rc)
    exit (EX_CONFIG);

  log_setup (log_to_stderr);
  
  if (argc != index && command != 'R')
    {
      mu_error ("extra command line arguments");
      exit (EX_CONFIG);
    }

  switch (command)
    {
    case OPT_RESTART:
      priv_setup (&pies_user);
      if (pies_umask)
	umask (pies_umask);
      exit (request_restart_components (argv + index));

    case OPT_RELOAD:
      exit (pies_reload ());

    case OPT_STATUS:
      exit (pies_status ());

    case OPT_STOP:
      exit (pies_stop ());

    default:
      priv_setup (&pies_user);
      if (pies_umask)
	umask (pies_umask);
    }

  mu_diag_output (MU_DIAG_INFO, _("%s starting"), program_version); 

  if (!foreground && daemon (0, 0) == -1)
    {
      mu_error (_("cannot become a daemon: %s"),
		mu_strerror (errno));
      exit (EX_SOFTWARE);
    }

  rc = mu_daemon_create_pidfile (pidfile);
  if (rc)
    mu_error (_("Cannot create PID file `%s': %s"),
	      pidfile, mu_strerror (rc));
  
  if (argv[0][0] != '/')
    mu_diag_output (MU_DIAG_NOTICE,
		    N_("not started as an absolute pathname; "
		       "SIGHUP will not work"));

  signal_setup (sig_handler);

  progman_start ();

  while (action == ACTION_CONT)
    {
      if (!children_cleanup)
	pause ();
      if (children_cleanup)
	{
	  children_cleanup = 0;
	  progman_cleanup (0);
	}
      if (got_alarm)
	{
	  got_alarm = 0;
	  progman_wake_sleeping ();
	}
      switch (action)
	{
	case ACTION_COMPRELOAD:
	  stop_components ();
	  action = ACTION_CONT;
	  break;

	case ACTION_DUMPSTATS:
	  progman_dump_stats (statfile);
	  action = ACTION_CONT;
	  break;
	}
    }
  progman_stop ();

  if (action == ACTION_RESTART && argv[0][0] == '/')
    {
      int i;

      for (i = getmaxfd (); i > 0; i--)
	close (i);

      mu_daemon_remove_pidfile ();
      signal_setup (SIG_DFL);
      
      execv (argv[0], argv);
    }
  
  mu_diag_output (MU_DIAG_INFO, _("%s terminated"), program_version); 
  exit (EX_OK);
}

void
xalloc_die ()
{
  mu_error ("not enough memory");
  abort ();
}

/*
 Local Variables:
 c-file-style: "gnu"
 End:
*/
/* EOF */

Return to:

Send suggestions and report system problems to the System administrator.