about summary refs log tree commit diff
path: root/nss/getent.c
blob: f019096f836335341e288e9fd59a35dd8c652fe6 (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
/* Copyright (c) 1998-2012, 2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.

   The GNU C Library 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 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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 GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/* getent: get entries from administrative database.  */

#include <aliases.h>
#include <argp.h>
#include <ctype.h>
#include <error.h>
#include <grp.h>
#include <gshadow.h>
#include <libintl.h>
#include <locale.h>
#include <mcheck.h>
#include <netdb.h>
#include <pwd.h>
#include <shadow.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <netinet/ether.h>
#include <netinet/in.h>
#include <sys/socket.h>

/* Get libc version number.  */
#include <version.h>

#define PACKAGE _libc_intl_domainname

/* Name and version of program.  */
static void print_version (FILE *stream, struct argp_state *state);
void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;

/* Short description of parameters.  */
static const char args_doc[] = N_("database [key ...]");

/* Supported options. */
static const struct argp_option args_options[] =
  {
    { "service", 's', "CONFIG", 0, N_("Service configuration to be used") },
    { "no-idn", 'i', NULL, 0, N_("disable IDN encoding") },
    { NULL, 0, NULL, 0, NULL },
  };

/* Short description of program.  */
static const char doc[] = N_("Get entries from administrative database.");

/* Prototype for option handler.  */
static error_t parse_option (int key, char *arg, struct argp_state *state);

/* Function to print some extra text in the help message.  */
static char *more_help (int key, const char *text, void *input);

/* Data structure to communicate with argp functions.  */
static struct argp argp =
  {
    args_options, parse_option, args_doc, doc, NULL, more_help
  };

/* Additional getaddrinfo flags for IDN encoding.  */
static int idn_flags = AI_IDN | AI_CANONIDN;

/* Print the version information.  */
static void
print_version (FILE *stream, struct argp_state *state)
{
  fprintf (stream, "getent %s%s\n", PKGVERSION, VERSION);
  fprintf (stream, gettext ("\
Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2013");
  fprintf (stream, gettext ("Written by %s.\n"), "Thorsten Kukuk");
}

/* This is for aliases */
static inline void
print_aliases (struct aliasent *alias)
{
  unsigned int i = 0;

  printf ("%s: ", alias->alias_name);
  for  (i = strlen (alias->alias_name); i < 14; ++i)
    fputs_unlocked (" ", stdout);

  for (i = 0; i < alias->alias_members_len; ++i)
    printf ("%s%s",
	    alias->alias_members [i],
	    i + 1 == alias->alias_members_len ? "\n" : ", ");
}

static int
aliases_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct aliasent *alias;

  if (number == 0)
    {
      setaliasent ();
      while ((alias = getaliasent ()) != NULL)
	print_aliases (alias);
      endaliasent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      alias = getaliasbyname (key[i]);

      if (alias == NULL)
	result = 2;
      else
	print_aliases (alias);
    }

  return result;
}

/* This is for ethers */
static int
ethers_keys (int number, char *key[])
{
  int result = 0;
  int i;

  if (number == 0)
    {
      fprintf (stderr, _("Enumeration not supported on %s\n"), "ethers");
      return 3;
    }

  for (i = 0; i < number; ++i)
    {
      struct ether_addr *ethp, eth;
      char buffer [1024], *p;

      ethp = ether_aton (key[i]);
      if (ethp != NULL)
	{
	  if (ether_ntohost (buffer, ethp))
	    {
	      result = 2;
	      continue;
	    }
	  p = buffer;
	}
      else
	{
	  if (ether_hostton (key[i], &eth))
	    {
	      result = 2;
	      continue;
	    }
	  p = key[i];
	  ethp = &eth;
	}
      printf ("%s %s\n", ether_ntoa (ethp), p);
    }

  return result;
}

/* This is for group */
static inline void
print_group (struct group *grp)
{
  unsigned int i = 0;

  printf ("%s:%s:%lu:", grp->gr_name ? grp->gr_name : "",
	  grp->gr_passwd ? grp->gr_passwd : "",
	  (unsigned long int) grp->gr_gid);

  while (grp->gr_mem[i] != NULL)
    {
      fputs_unlocked (grp->gr_mem[i], stdout);
      ++i;
      if (grp->gr_mem[i] != NULL)
	putchar_unlocked (',');
    }
  putchar_unlocked ('\n');
}

static int
group_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct group *grp;

  if (number == 0)
    {
      setgrent ();
      while ((grp = getgrent ()) != NULL)
	print_group (grp);
      endgrent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      errno = 0;
      char *ep;
      gid_t arg_gid = strtoul(key[i], &ep, 10);

      if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
	/* Valid numeric gid.  */
	grp = getgrgid (arg_gid);
      else
	grp = getgrnam (key[i]);

      if (grp == NULL)
	result = 2;
      else
	print_group (grp);
    }

  return result;
}

/* This is for gshadow */
static void
print_gshadow (struct sgrp *sg)
{
  unsigned int i = 0;

  printf ("%s:%s:",
	  sg->sg_namp ? sg->sg_namp : "",
	  sg->sg_passwd ? sg->sg_passwd : "");

  while (sg->sg_adm[i] != NULL)
    {
      fputs_unlocked (sg->sg_adm[i], stdout);
      ++i;
      if (sg->sg_adm[i] != NULL)
	putchar_unlocked (',');
    }

  putchar_unlocked (':');

  i = 0;
  while (sg->sg_mem[i] != NULL)
    {
      fputs_unlocked (sg->sg_mem[i], stdout);
      ++i;
      if (sg->sg_mem[i] != NULL)
	putchar_unlocked (',');
    }

  putchar_unlocked ('\n');
}

static int
gshadow_keys (int number, char *key[])
{
  int result = 0;
  int i;

  if (number == 0)
    {
      struct sgrp *sg;

      setsgent ();
      while ((sg = getsgent ()) != NULL)
	print_gshadow (sg);
      endsgent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      struct sgrp *sg;

      sg = getsgnam (key[i]);

      if (sg == NULL)
	result = 2;
      else
	print_gshadow (sg);
    }

  return result;
}

/* This is for hosts */
static void
print_hosts (struct hostent *host)
{
  unsigned int cnt;

  for (cnt = 0; host->h_addr_list[cnt] != NULL; ++cnt)
    {
      char buf[INET6_ADDRSTRLEN];
      const char *ip = inet_ntop (host->h_addrtype, host->h_addr_list[cnt],
				  buf, sizeof (buf));

      printf ("%-15s %s", ip, host->h_name);

      unsigned int i;
      for (i = 0; host->h_aliases[i] != NULL; ++i)
	{
	  putchar_unlocked (' ');
	  fputs_unlocked (host->h_aliases[i], stdout);
	}
      putchar_unlocked ('\n');
    }
}

static int
hosts_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct hostent *host;

  if (number == 0)
    {
      sethostent (0);
      while ((host = gethostent ()) != NULL)
	print_hosts (host);
      endhostent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      struct hostent *host = NULL;
      char addr[IN6ADDRSZ];

      if (inet_pton (AF_INET6, key[i], &addr) > 0)
	host = gethostbyaddr (addr, IN6ADDRSZ, AF_INET6);
      else if (inet_pton (AF_INET, key[i], &addr) > 0)
	host = gethostbyaddr (addr, INADDRSZ, AF_INET);
      else if ((host = gethostbyname2 (key[i], AF_INET6)) == NULL)
	host = gethostbyname2 (key[i], AF_INET);

      if (host == NULL)
	result = 2;
      else
	print_hosts (host);
    }

  return result;
}

/* This is for hosts, but using getaddrinfo */
static int
ahosts_keys_int (int af, int xflags, int number, char *key[])
{
  int result = 0;
  int i;
  struct hostent *host;

  if (number == 0)
    {
      sethostent (0);
      while ((host = gethostent ()) != NULL)
	print_hosts (host);
      endhostent ();
      return result;
    }

  struct addrinfo hint;
  memset (&hint, '\0', sizeof (hint));
  hint.ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG | AI_CANONNAME
		   | idn_flags | xflags);
  hint.ai_family = af;

  for (i = 0; i < number; ++i)
    {
      struct addrinfo *res;

      if (getaddrinfo (key[i], NULL, &hint, &res) != 0)
	result = 2;
      else
	{
	  struct addrinfo *runp = res;

	  while (runp != NULL)
	    {
	      char sockbuf[20];
	      const char *sockstr;
	      if (runp->ai_socktype == SOCK_STREAM)
		sockstr = "STREAM";
	      else if (runp->ai_socktype == SOCK_DGRAM)
		sockstr = "DGRAM";
	      else if (runp->ai_socktype == SOCK_RAW)
		sockstr = "RAW";
#ifdef SOCK_SEQPACKET
	      else if (runp->ai_socktype == SOCK_SEQPACKET)
		sockstr = "SEQPACKET";
#endif
#ifdef SOCK_RDM
	      else if (runp->ai_socktype == SOCK_RDM)
		sockstr = "RDM";
#endif
#ifdef SOCK_DCCP
	      else if (runp->ai_socktype == SOCK_DCCP)
		sockstr = "DCCP";
#endif
#ifdef SOCK_PACKET
	      else if (runp->ai_socktype == SOCK_PACKET)
		sockstr = "PACKET";
#endif
	      else
		{
		  snprintf (sockbuf, sizeof (sockbuf), "%d",
			    runp->ai_socktype);
		  sockstr = sockbuf;
		}

	      char buf[INET6_ADDRSTRLEN];
	      printf ("%-15s %-6s %s\n",
		      inet_ntop (runp->ai_family,
				 runp->ai_family == AF_INET
				 ? (void *) &((struct sockaddr_in *) runp->ai_addr)->sin_addr
				 : (void *) &((struct sockaddr_in6 *) runp->ai_addr)->sin6_addr,
				 buf, sizeof (buf)),
		      sockstr,
		      runp->ai_canonname ?: "");

	      runp = runp->ai_next;
	    }

	  freeaddrinfo (res);
	}
    }

  return result;
}

static int
ahosts_keys (int number, char *key[])
{
  return ahosts_keys_int (AF_UNSPEC, 0, number, key);
}

static int
ahostsv4_keys (int number, char *key[])
{
  return ahosts_keys_int (AF_INET, 0, number, key);
}

static int
ahostsv6_keys (int number, char *key[])
{
  return ahosts_keys_int (AF_INET6, AI_V4MAPPED, number, key);
}

/* This is for netgroup */
static int
netgroup_keys (int number, char *key[])
{
  int result = 0;

  if (number == 0)
    {
      fprintf (stderr, _("Enumeration not supported on %s\n"), "netgroup");
      return 3;
    }

  if (number == 4)
    {
      char *host = strcmp (key[1], "*") == 0 ? NULL : key[1];
      char *user = strcmp (key[2], "*") == 0 ? NULL : key[2];
      char *domain = strcmp (key[3], "*") == 0 ? NULL : key[3];

      printf ("%-21s (%s,%s,%s) = %d\n",
	      key[0], host ?: "", user ?: "", domain ?: "",
	      innetgr (key[0], host, user, domain));
    }
  else if (number == 1)
    {
      if (!setnetgrent (key[0]))
	result = 2;
      else
	{
	  char *p[3];

	  printf ("%-21s", key[0]);

	  while (getnetgrent (p, p + 1, p + 2))
	    printf (" (%s,%s,%s)", p[0] ?: " ", p[1] ?: "", p[2] ?: "");
	  putchar_unlocked ('\n');
	}
    }

  endnetgrent ();

  return result;
}

/* This is for initgroups */
static int
initgroups_keys (int number, char *key[])
{
  int ngrps = 100;
  size_t grpslen = ngrps * sizeof (gid_t);
  gid_t *grps = alloca (grpslen);

  if (number == 0)
    {
      fprintf (stderr, _("Enumeration not supported on %s\n"), "initgroups");
      return 3;
    }

  for (int i = 0; i < number; ++i)
    {
      int no = ngrps;
      int n;
      while ((n = getgrouplist (key[i], -1, grps, &no)) == -1
	     && no > ngrps)
	{
	  grps = extend_alloca (grps, grpslen, no * sizeof (gid_t));
	  ngrps = no;
	}

      if (n == -1)
	return 1;

      printf ("%-21s", key[i]);
      for (int j = 0; j < n; ++j)
	if (grps[j] != -1)
	  printf (" %ld", (long int) grps[j]);
      putchar_unlocked ('\n');
    }

  return 0;
}

/* This is for networks */
static void
print_networks (struct netent *net)
{
  unsigned int i;
  struct in_addr ip;
  ip.s_addr = htonl (net->n_net);

  printf ("%-21s %s", net->n_name, inet_ntoa (ip));

  i = 0;
  while (net->n_aliases[i] != NULL)
    {
      putchar_unlocked (' ');
      fputs_unlocked (net->n_aliases[i], stdout);
      ++i;
    }
  putchar_unlocked ('\n');
}

static int
networks_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct netent *net;

  if (number == 0)
    {
      setnetent (0);
      while ((net = getnetent ()) != NULL)
	print_networks (net);
      endnetent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      if (isdigit (key[i][0]))
	net = getnetbyaddr (ntohl (inet_addr (key[i])), AF_UNSPEC);
      else
	net = getnetbyname (key[i]);

      if (net == NULL)
	result = 2;
      else
	print_networks (net);
    }

  return result;
}

/* Now is all for passwd */
static inline void
print_passwd (struct passwd *pwd)
{
  printf ("%s:%s:%lu:%lu:%s:%s:%s\n",
	  pwd->pw_name ? pwd->pw_name : "",
	  pwd->pw_passwd ? pwd->pw_passwd : "",
	  (unsigned long int) pwd->pw_uid,
	  (unsigned long int) pwd->pw_gid,
	  pwd->pw_gecos ? pwd->pw_gecos : "",
	  pwd->pw_dir ? pwd->pw_dir : "",
	  pwd->pw_shell ? pwd->pw_shell : "");
}

static int
passwd_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct passwd *pwd;

  if (number == 0)
    {
      setpwent ();
      while ((pwd = getpwent ()) != NULL)
	print_passwd (pwd);
      endpwent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      errno = 0;
      char *ep;
      uid_t arg_uid = strtoul(key[i], &ep, 10);

      if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
	/* Valid numeric uid.  */
	pwd = getpwuid (arg_uid);
      else
	pwd = getpwnam (key[i]);

      if (pwd == NULL)
	result = 2;
      else
	print_passwd (pwd);
    }

  return result;
}

/* This is for protocols */
static inline void
print_protocols (struct protoent *proto)
{
  unsigned int i;

  printf ("%-21s %d", proto->p_name, proto->p_proto);

  i = 0;
  while (proto->p_aliases[i] != NULL)
    {
      putchar_unlocked (' ');
      fputs_unlocked (proto->p_aliases[i], stdout);
      ++i;
    }
  putchar_unlocked ('\n');
}

static int
protocols_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct protoent *proto;

  if (number == 0)
    {
      setprotoent (0);
      while ((proto = getprotoent ()) != NULL)
	print_protocols (proto);
      endprotoent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      if (isdigit (key[i][0]))
	proto = getprotobynumber (atol (key[i]));
      else
	proto = getprotobyname (key[i]);

      if (proto == NULL)
	result = 2;
      else
	print_protocols (proto);
    }

  return result;
}

/* Now is all for rpc */
static inline void
print_rpc (struct rpcent *rpc)
{
  int i;

  printf ("%-15s %d%s",
	  rpc->r_name, rpc->r_number, rpc->r_aliases[0] ? " " : "");

  for (i = 0; rpc->r_aliases[i]; ++i)
    printf (" %s", rpc->r_aliases[i]);
  putchar_unlocked ('\n');
}

static int
rpc_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct rpcent *rpc;

  if (number == 0)
    {
      setrpcent (0);
      while ((rpc = getrpcent ()) != NULL)
	print_rpc (rpc);
      endrpcent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      if (isdigit (key[i][0]))
	rpc = getrpcbynumber (atol (key[i]));
      else
	rpc = getrpcbyname (key[i]);

      if (rpc == NULL)
	result = 2;
      else
	print_rpc (rpc);
    }

  return result;
}

/* for services */
static void
print_services (struct servent *serv)
{
  unsigned int i;

  printf ("%-21s %d/%s", serv->s_name, ntohs (serv->s_port), serv->s_proto);

  i = 0;
  while (serv->s_aliases[i] != NULL)
    {
      putchar_unlocked (' ');
      fputs_unlocked (serv->s_aliases[i], stdout);
      ++i;
    }
  putchar_unlocked ('\n');
}

static int
services_keys (int number, char *key[])
{
  int result = 0;
  int i;
  struct servent *serv;

  if (!number)
    {
      setservent (0);
      while ((serv = getservent ()) != NULL)
	print_services (serv);
      endservent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      struct servent *serv;
      char *proto = strchr (key[i], '/');

      if (proto != NULL)
	*proto++ = '\0';

      if (isdigit (key[i][0]))
	serv = getservbyport (htons (atol (key[i])), proto);
      else
	serv = getservbyname (key[i], proto);

      if (serv == NULL)
	result = 2;
      else
	print_services (serv);
    }

  return result;
}

/* This is for shadow */
static void
print_shadow (struct spwd *sp)
{
  printf ("%s:%s:",
	  sp->sp_namp ? sp->sp_namp : "",
	  sp->sp_pwdp ? sp->sp_pwdp : "");

#define SHADOW_FIELD(n) \
  if (sp->n == -1)							      \
    putchar_unlocked (':');						      \
  else									      \
    printf ("%ld:", sp->n)

  SHADOW_FIELD (sp_lstchg);
  SHADOW_FIELD (sp_min);
  SHADOW_FIELD (sp_max);
  SHADOW_FIELD (sp_warn);
  SHADOW_FIELD (sp_inact);
  SHADOW_FIELD (sp_expire);
  if (sp->sp_flag == ~0ul)
    putchar_unlocked ('\n');
  else
    printf ("%lu\n", sp->sp_flag);
}

static int
shadow_keys (int number, char *key[])
{
  int result = 0;
  int i;

  if (number == 0)
    {
      struct spwd *sp;

      setspent ();
      while ((sp = getspent ()) != NULL)
	print_shadow (sp);
      endpwent ();
      return result;
    }

  for (i = 0; i < number; ++i)
    {
      struct spwd *sp;

      sp = getspnam (key[i]);

      if (sp == NULL)
	result = 2;
      else
	print_shadow (sp);
    }

  return result;
}

struct
  {
    const char *name;
    int (*func) (int number, char *key[]);
  } databases[] =
  {
#define D(name) { #name, name ## _keys },
D(ahosts)
D(ahostsv4)
D(ahostsv6)
D(aliases)
D(ethers)
D(group)
D(gshadow)
D(hosts)
D(initgroups)
D(netgroup)
D(networks)
D(passwd)
D(protocols)
D(rpc)
D(services)
D(shadow)
#undef D
    { NULL, NULL }
  };

/* Handle arguments found by argp. */
static error_t
parse_option (int key, char *arg, struct argp_state *state)
{
  char *endp;
  switch (key)
    {
    case 's':
      endp = strchr (arg, ':');
      if (endp == NULL)
	/* No specific database, change them all.  */
	for (int i = 0; databases[i].name != NULL; ++i)
	  __nss_configure_lookup (databases[i].name, arg);
      else
	{
	  int i;
	  for (i = 0; databases[i].name != NULL; ++i)
	    if (strncmp (databases[i].name, arg, endp - arg) == 0)
	      {
		__nss_configure_lookup (databases[i].name, endp + 1);
		break;
	      }
	  if (databases[i].name == NULL)
	    error (EXIT_FAILURE, 0, gettext ("Unknown database name"));
	}
      break;

    case 'i':
      idn_flags = 0;
      break;

    default:
      return ARGP_ERR_UNKNOWN;
    }

  return 0;
}


static char *
more_help (int key, const char *text, void *input)
{
  switch (key)
    {
      size_t len;
      char *doc;
      FILE *fp;

    case ARGP_KEY_HELP_EXTRA:
      /* We print some extra information.  */
      fp = open_memstream (&doc, &len);
      if (fp != NULL)
	{
	  fputs_unlocked (_("Supported databases:\n"), fp);

	  for (int i = 0, col = 0; databases[i].name != NULL; ++i)
	    {
	      len = strlen (databases[i].name);
	      if (i != 0)
		{
		  if (col + len > 72)
		    {
		      col = 0;
		      fputc_unlocked ('\n', fp);
		    }
		  else
		    fputc_unlocked (' ', fp);
		}

	      fputs_unlocked (databases[i].name, fp);
	      col += len + 1;
	    }

	  fputs ("\n\n", fp);

	  fprintf (fp, gettext ("\
For bug reporting instructions, please see:\n\
%s.\n"), REPORT_BUGS_TO);

	  if (fclose (fp) == 0)
	    return doc;
	}
      break;

    default:
      break;
    }
  return (char *) text;
}


/* the main function */
int
main (int argc, char *argv[])
{
  /* Debugging support.  */
  mtrace ();

  /* Set locale via LC_ALL.  */
  setlocale (LC_ALL, "");
  /* Set the text message domain.  */
  textdomain (PACKAGE);

  /* Parse and process arguments.  */
  int remaining;
  argp_parse (&argp, argc, argv, 0, &remaining, NULL);

  if ((argc - remaining) < 1)
    {
      error (0, 0, gettext ("wrong number of arguments"));
      argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
      return 1;
    }

  for (int i = 0; databases[i].name; ++i)
    if (argv[remaining][0] == databases[i].name[0]
	&& !strcmp (argv[remaining], databases[i].name))
      return databases[i].func (argc - remaining - 1, &argv[remaining + 1]);

  fprintf (stderr, _("Unknown database: %s\n"), argv[remaining]);
  argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
  return 1;
}