nss/getent.c

   1 /* Copyright (c) 1998-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* getent: get entries from administrative database.  */
  20
  21 #include <aliases.h>
  22 #include <argp.h>
  23 #include <ctype.h>
  24 #include <error.h>
  25 #include <grp.h>
  26 #include <gshadow.h>
  27 #include <libintl.h>
  28 #include <locale.h>
  29 #include <mcheck.h>
  30 #include <netdb.h>
  31 #include <pwd.h>
  32 #include <shadow.h>
  33 #include <stdbool.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <arpa/inet.h>
  38 #include <arpa/nameser.h>
  39 #include <netinet/ether.h>
  40 #include <netinet/in.h>
  41 #include <sys/socket.h>
  42
  43 /* Get libc version number.  */
  44 #include <version.h>
  45
  46 #define PACKAGE _libc_intl_domainname
  47
  48 /* Name and version of program.  */
  49 static void print_version (FILE *stream, struct argp_state *state);
  50 void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
  51
  52 /* Short description of parameters.  */
  53 static const char args_doc[] = N_("database [key ...]");
  54
  55 /* Supported options. */
  56 static const struct argp_option args_options[] =
  57   {
  58     { "service", 's', N_("CONFIG"), 0, N_("Service configuration to be used") },
  59     { "no-idn", 'i', NULL, 0, N_("disable IDN encoding") },
  60     { NULL, 0, NULL, 0, NULL },
  61   };
  62
  63 /* Short description of program.  */
  64 static const char doc[] = N_("Get entries from administrative database.");
  65
  66 /* Prototype for option handler.  */
  67 static error_t parse_option (int key, char *arg, struct argp_state *state);
  68
  69 /* Function to print some extra text in the help message.  */
  70 static char *more_help (int key, const char *text, void *input);
  71
  72 /* Data structure to communicate with argp functions.  */
  73 static struct argp argp =
  74   {
  75     args_options, parse_option, args_doc, doc, NULL, more_help
  76   };
  77
  78 /* Additional getaddrinfo flags for IDN encoding.  */
  79 static int idn_flags = AI_IDN | AI_CANONIDN;
  80
  81 /* Print the version information.  */
  82 static void
  83 print_version (FILE *stream, struct argp_state *state)
  84 {
  85   fprintf (stream, "getent %s%s\n", PKGVERSION, VERSION);
  86   fprintf (stream, gettext ("\
  87 Copyright (C) %s Free Software Foundation, Inc.\n\
  88 This is free software; see the source for copying conditions.  There is NO\n\
  89 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
  90 "), "2013");
  91   fprintf (stream, gettext ("Written by %s.\n"), "Thorsten Kukuk");
  92 }
  93
  94 /* This is for aliases */
  95 static void
  96 print_aliases (struct aliasent *alias)
  97 {
  98   unsigned int i = 0;
  99
 100   printf ("%s: ", alias->alias_name);
 101   for  (i = strlen (alias->alias_name); i < 14; ++i)
 102     fputs_unlocked (" ", stdout);
 103
 104   for (i = 0; i < alias->alias_members_len; ++i)
 105     printf ("%s%s",
 106             alias->alias_members [i],
 107             i + 1 == alias->alias_members_len ? "\n" : ", ");
 108 }
 109
 110 static int
 111 aliases_keys (int number, char *key[])
 112 {
 113   int result = 0;
 114   int i;
 115   struct aliasent *alias;
 116
 117   if (number == 0)
 118     {
 119       setaliasent ();
 120       while ((alias = getaliasent ()) != NULL)
 121         print_aliases (alias);
 122       endaliasent ();
 123       return result;
 124     }
 125
 126   for (i = 0; i < number; ++i)
 127     {
 128       alias = getaliasbyname (key[i]);
 129
 130       if (alias == NULL)
 131         result = 2;
 132       else
 133         print_aliases (alias);
 134     }
 135
 136   return result;
 137 }
 138
 139 /* This is for ethers */
 140 static int
 141 ethers_keys (int number, char *key[])
 142 {
 143   int result = 0;
 144   int i;
 145
 146   if (number == 0)
 147     {
 148       fprintf (stderr, _("Enumeration not supported on %s\n"), "ethers");
 149       return 3;
 150     }
 151
 152   for (i = 0; i < number; ++i)
 153     {
 154       struct ether_addr *ethp, eth;
 155       char buffer [1024], *p;
 156
 157       ethp = ether_aton (key[i]);
 158       if (ethp != NULL)
 159         {
 160           if (ether_ntohost (buffer, ethp))
 161             {
 162               result = 2;
 163               continue;
 164             }
 165           p = buffer;
 166         }
 167       else
 168         {
 169           if (ether_hostton (key[i], &eth))
 170             {
 171               result = 2;
 172               continue;
 173             }
 174           p = key[i];
 175           ethp = &eth;
 176         }
 177       printf ("%s %s\n", ether_ntoa (ethp), p);
 178     }
 179
 180   return result;
 181 }
 182
 183 /* This is for group */
 184 static void
 185 print_group (struct group *grp)
 186 {
 187   unsigned int i = 0;
 188
 189   printf ("%s:%s:%lu:", grp->gr_name ? grp->gr_name : "",
 190           grp->gr_passwd ? grp->gr_passwd : "",
 191           (unsigned long int) grp->gr_gid);
 192
 193   while (grp->gr_mem[i] != NULL)
 194     {
 195       fputs_unlocked (grp->gr_mem[i], stdout);
 196       ++i;
 197       if (grp->gr_mem[i] != NULL)
 198         putchar_unlocked (',');
 199     }
 200   putchar_unlocked ('\n');
 201 }
 202
 203 static int
 204 group_keys (int number, char *key[])
 205 {
 206   int result = 0;
 207   int i;
 208   struct group *grp;
 209
 210   if (number == 0)
 211     {
 212       setgrent ();
 213       while ((grp = getgrent ()) != NULL)
 214         print_group (grp);
 215       endgrent ();
 216       return result;
 217     }
 218
 219   for (i = 0; i < number; ++i)
 220     {
 221       errno = 0;
 222       char *ep;
 223       gid_t arg_gid = strtoul(key[i], &ep, 10);
 224
 225       if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
 226         /* Valid numeric gid.  */
 227         grp = getgrgid (arg_gid);
 228       else
 229         grp = getgrnam (key[i]);
 230
 231       if (grp == NULL)
 232         result = 2;
 233       else
 234         print_group (grp);
 235     }
 236
 237   return result;
 238 }
 239
 240 /* This is for gshadow */
 241 static void
 242 print_gshadow (struct sgrp *sg)
 243 {
 244   unsigned int i = 0;
 245
 246   printf ("%s:%s:",
 247           sg->sg_namp ? sg->sg_namp : "",
 248           sg->sg_passwd ? sg->sg_passwd : "");
 249
 250   while (sg->sg_adm[i] != NULL)
 251     {
 252       fputs_unlocked (sg->sg_adm[i], stdout);
 253       ++i;
 254       if (sg->sg_adm[i] != NULL)
 255         putchar_unlocked (',');
 256     }
 257
 258   putchar_unlocked (':');
 259
 260   i = 0;
 261   while (sg->sg_mem[i] != NULL)
 262     {
 263       fputs_unlocked (sg->sg_mem[i], stdout);
 264       ++i;
 265       if (sg->sg_mem[i] != NULL)
 266         putchar_unlocked (',');
 267     }
 268
 269   putchar_unlocked ('\n');
 270 }
 271
 272 static int
 273 gshadow_keys (int number, char *key[])
 274 {
 275   int result = 0;
 276   int i;
 277
 278   if (number == 0)
 279     {
 280       struct sgrp *sg;
 281
 282       setsgent ();
 283       while ((sg = getsgent ()) != NULL)
 284         print_gshadow (sg);
 285       endsgent ();
 286       return result;
 287     }
 288
 289   for (i = 0; i < number; ++i)
 290     {
 291       struct sgrp *sg;
 292
 293       sg = getsgnam (key[i]);
 294
 295       if (sg == NULL)
 296         result = 2;
 297       else
 298         print_gshadow (sg);
 299     }
 300
 301   return result;
 302 }
 303
 304 /* This is for hosts */
 305 static void
 306 print_hosts (struct hostent *host)
 307 {
 308   unsigned int cnt;
 309
 310   for (cnt = 0; host->h_addr_list[cnt] != NULL; ++cnt)
 311     {
 312       char buf[INET6_ADDRSTRLEN];
 313       const char *ip = inet_ntop (host->h_addrtype, host->h_addr_list[cnt],
 314                                   buf, sizeof (buf));
 315
 316       printf ("%-15s %s", ip, host->h_name);
 317
 318       unsigned int i;
 319       for (i = 0; host->h_aliases[i] != NULL; ++i)
 320         {
 321           putchar_unlocked (' ');
 322           fputs_unlocked (host->h_aliases[i], stdout);
 323         }
 324       putchar_unlocked ('\n');
 325     }
 326 }
 327
 328 static int
 329 hosts_keys (int number, char *key[])
 330 {
 331   int result = 0;
 332   int i;
 333   struct hostent *host;
 334
 335   if (number == 0)
 336     {
 337       sethostent (0);
 338       while ((host = gethostent ()) != NULL)
 339         print_hosts (host);
 340       endhostent ();
 341       return result;
 342     }
 343
 344   for (i = 0; i < number; ++i)
 345     {
 346       struct hostent *host = NULL;
 347       char addr[IN6ADDRSZ];
 348
 349       if (inet_pton (AF_INET6, key[i], &addr) > 0)
 350         host = gethostbyaddr (addr, IN6ADDRSZ, AF_INET6);
 351       else if (inet_pton (AF_INET, key[i], &addr) > 0)
 352         host = gethostbyaddr (addr, INADDRSZ, AF_INET);
 353       else if ((host = gethostbyname2 (key[i], AF_INET6)) == NULL)
 354         host = gethostbyname2 (key[i], AF_INET);
 355
 356       if (host == NULL)
 357         result = 2;
 358       else
 359         print_hosts (host);
 360     }
 361
 362   return result;
 363 }
 364
 365 /* This is for hosts, but using getaddrinfo */
 366 static int
 367 ahosts_keys_int (int af, int xflags, int number, char *key[])
 368 {
 369   int result = 0;
 370   int i;
 371   struct hostent *host;
 372
 373   if (number == 0)
 374     {
 375       sethostent (0);
 376       while ((host = gethostent ()) != NULL)
 377         print_hosts (host);
 378       endhostent ();
 379       return result;
 380     }
 381
 382   struct addrinfo hint;
 383   memset (&hint, '\0', sizeof (hint));
 384   hint.ai_flags = (AI_V4MAPPED | AI_ADDRCONFIG | AI_CANONNAME
 385                    | idn_flags | xflags);
 386   hint.ai_family = af;
 387
 388   for (i = 0; i < number; ++i)
 389     {
 390       struct addrinfo *res;
 391
 392       if (getaddrinfo (key[i], NULL, &hint, &res) != 0)
 393         result = 2;
 394       else
 395         {
 396           struct addrinfo *runp = res;
 397
 398           while (runp != NULL)
 399             {
 400               char sockbuf[20];
 401               const char *sockstr;
 402               if (runp->ai_socktype == SOCK_STREAM)
 403                 sockstr = "STREAM";
 404               else if (runp->ai_socktype == SOCK_DGRAM)
 405                 sockstr = "DGRAM";
 406               else if (runp->ai_socktype == SOCK_RAW)
 407                 sockstr = "RAW";
 408 #ifdef SOCK_SEQPACKET
 409               else if (runp->ai_socktype == SOCK_SEQPACKET)
 410                 sockstr = "SEQPACKET";
 411 #endif
 412 #ifdef SOCK_RDM
 413               else if (runp->ai_socktype == SOCK_RDM)
 414                 sockstr = "RDM";
 415 #endif
 416 #ifdef SOCK_DCCP
 417               else if (runp->ai_socktype == SOCK_DCCP)
 418                 sockstr = "DCCP";
 419 #endif
 420 #ifdef SOCK_PACKET
 421               else if (runp->ai_socktype == SOCK_PACKET)
 422                 sockstr = "PACKET";
 423 #endif
 424               else
 425                 {
 426                   snprintf (sockbuf, sizeof (sockbuf), "%d",
 427                             runp->ai_socktype);
 428                   sockstr = sockbuf;
 429                 }
 430
 431               char buf[INET6_ADDRSTRLEN];
 432               printf ("%-15s %-6s %s\n",
 433                       inet_ntop (runp->ai_family,
 434                                  runp->ai_family == AF_INET
 435                                  ? (void *) &((struct sockaddr_in *) runp->ai_addr)->sin_addr
 436                                  : (void *) &((struct sockaddr_in6 *) runp->ai_addr)->sin6_addr,
 437                                  buf, sizeof (buf)),
 438                       sockstr,
 439                       runp->ai_canonname ?: "");
 440
 441               runp = runp->ai_next;
 442             }
 443
 444           freeaddrinfo (res);
 445         }
 446     }
 447
 448   return result;
 449 }
 450
 451 static int
 452 ahosts_keys (int number, char *key[])
 453 {
 454   return ahosts_keys_int (AF_UNSPEC, 0, number, key);
 455 }
 456
 457 static int
 458 ahostsv4_keys (int number, char *key[])
 459 {
 460   return ahosts_keys_int (AF_INET, 0, number, key);
 461 }
 462
 463 static int
 464 ahostsv6_keys (int number, char *key[])
 465 {
 466   return ahosts_keys_int (AF_INET6, AI_V4MAPPED, number, key);
 467 }
 468
 469 /* This is for netgroup */
 470 static int
 471 netgroup_keys (int number, char *key[])
 472 {
 473   int result = 0;
 474
 475   if (number == 0)
 476     {
 477       fprintf (stderr, _("Enumeration not supported on %s\n"), "netgroup");
 478       return 3;
 479     }
 480
 481   if (number == 4)
 482     {
 483       char *host = strcmp (key[1], "*") == 0 ? NULL : key[1];
 484       char *user = strcmp (key[2], "*") == 0 ? NULL : key[2];
 485       char *domain = strcmp (key[3], "*") == 0 ? NULL : key[3];
 486
 487       printf ("%-21s (%s,%s,%s) = %d\n",
 488               key[0], host ?: "", user ?: "", domain ?: "",
 489               innetgr (key[0], host, user, domain));
 490     }
 491   else if (number == 1)
 492     {
 493       if (!setnetgrent (key[0]))
 494         result = 2;
 495       else
 496         {
 497           char *p[3];
 498
 499           printf ("%-21s", key[0]);
 500
 501           while (getnetgrent (p, p + 1, p + 2))
 502             printf (" (%s,%s,%s)", p[0] ?: " ", p[1] ?: "", p[2] ?: "");
 503           putchar_unlocked ('\n');
 504         }
 505     }
 506
 507   endnetgrent ();
 508
 509   return result;
 510 }
 511
 512 /* This is for initgroups */
 513 static int
 514 initgroups_keys (int number, char *key[])
 515 {
 516   int ngrps = 100;
 517   size_t grpslen = ngrps * sizeof (gid_t);
 518   gid_t *grps = alloca (grpslen);
 519
 520   if (number == 0)
 521     {
 522       fprintf (stderr, _("Enumeration not supported on %s\n"), "initgroups");
 523       return 3;
 524     }
 525
 526   for (int i = 0; i < number; ++i)
 527     {
 528       int no = ngrps;
 529       int n;
 530       while ((n = getgrouplist (key[i], -1, grps, &no)) == -1
 531              && no > ngrps)
 532         {
 533           grps = extend_alloca (grps, grpslen, no * sizeof (gid_t));
 534           ngrps = no;
 535         }
 536
 537       if (n == -1)
 538         return 1;
 539
 540       printf ("%-21s", key[i]);
 541       for (int j = 0; j < n; ++j)
 542         if (grps[j] != -1)
 543           printf (" %ld", (long int) grps[j]);
 544       putchar_unlocked ('\n');
 545     }
 546
 547   return 0;
 548 }
 549
 550 /* This is for networks */
 551 static void
 552 print_networks (struct netent *net)
 553 {
 554   unsigned int i;
 555   struct in_addr ip;
 556   ip.s_addr = htonl (net->n_net);
 557
 558   printf ("%-21s %s", net->n_name, inet_ntoa (ip));
 559
 560   i = 0;
 561   while (net->n_aliases[i] != NULL)
 562     {
 563       putchar_unlocked (' ');
 564       fputs_unlocked (net->n_aliases[i], stdout);
 565       ++i;
 566     }
 567   putchar_unlocked ('\n');
 568 }
 569
 570 static int
 571 networks_keys (int number, char *key[])
 572 {
 573   int result = 0;
 574   int i;
 575   struct netent *net;
 576
 577   if (number == 0)
 578     {
 579       setnetent (0);
 580       while ((net = getnetent ()) != NULL)
 581         print_networks (net);
 582       endnetent ();
 583       return result;
 584     }
 585
 586   for (i = 0; i < number; ++i)
 587     {
 588       if (isdigit (key[i][0]))
 589         net = getnetbyaddr (ntohl (inet_addr (key[i])), AF_UNSPEC);
 590       else
 591         net = getnetbyname (key[i]);
 592
 593       if (net == NULL)
 594         result = 2;
 595       else
 596         print_networks (net);
 597     }
 598
 599   return result;
 600 }
 601
 602 /* Now is all for passwd */
 603 static void
 604 print_passwd (struct passwd *pwd)
 605 {
 606   printf ("%s:%s:%lu:%lu:%s:%s:%s\n",
 607           pwd->pw_name ? pwd->pw_name : "",
 608           pwd->pw_passwd ? pwd->pw_passwd : "",
 609           (unsigned long int) pwd->pw_uid,
 610           (unsigned long int) pwd->pw_gid,
 611           pwd->pw_gecos ? pwd->pw_gecos : "",
 612           pwd->pw_dir ? pwd->pw_dir : "",
 613           pwd->pw_shell ? pwd->pw_shell : "");
 614 }
 615
 616 static int
 617 passwd_keys (int number, char *key[])
 618 {
 619   int result = 0;
 620   int i;
 621   struct passwd *pwd;
 622
 623   if (number == 0)
 624     {
 625       setpwent ();
 626       while ((pwd = getpwent ()) != NULL)
 627         print_passwd (pwd);
 628       endpwent ();
 629       return result;
 630     }
 631
 632   for (i = 0; i < number; ++i)
 633     {
 634       errno = 0;
 635       char *ep;
 636       uid_t arg_uid = strtoul(key[i], &ep, 10);
 637
 638       if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
 639         /* Valid numeric uid.  */
 640         pwd = getpwuid (arg_uid);
 641       else
 642         pwd = getpwnam (key[i]);
 643
 644       if (pwd == NULL)
 645         result = 2;
 646       else
 647         print_passwd (pwd);
 648     }
 649
 650   return result;
 651 }
 652
 653 /* This is for protocols */
 654 static void
 655 print_protocols (struct protoent *proto)
 656 {
 657   unsigned int i;
 658
 659   printf ("%-21s %d", proto->p_name, proto->p_proto);
 660
 661   i = 0;
 662   while (proto->p_aliases[i] != NULL)
 663     {
 664       putchar_unlocked (' ');
 665       fputs_unlocked (proto->p_aliases[i], stdout);
 666       ++i;
 667     }
 668   putchar_unlocked ('\n');
 669 }
 670
 671 static int
 672 protocols_keys (int number, char *key[])
 673 {
 674   int result = 0;
 675   int i;
 676   struct protoent *proto;
 677
 678   if (number == 0)
 679     {
 680       setprotoent (0);
 681       while ((proto = getprotoent ()) != NULL)
 682         print_protocols (proto);
 683       endprotoent ();
 684       return result;
 685     }
 686
 687   for (i = 0; i < number; ++i)
 688     {
 689       if (isdigit (key[i][0]))
 690         proto = getprotobynumber (atol (key[i]));
 691       else
 692         proto = getprotobyname (key[i]);
 693
 694       if (proto == NULL)
 695         result = 2;
 696       else
 697         print_protocols (proto);
 698     }
 699
 700   return result;
 701 }
 702
 703 /* Now is all for rpc */
 704 static void
 705 print_rpc (struct rpcent *rpc)
 706 {
 707   int i;
 708
 709   printf ("%-15s %d%s",
 710           rpc->r_name, rpc->r_number, rpc->r_aliases[0] ? " " : "");
 711
 712   for (i = 0; rpc->r_aliases[i]; ++i)
 713     printf (" %s", rpc->r_aliases[i]);
 714   putchar_unlocked ('\n');
 715 }
 716
 717 static int
 718 rpc_keys (int number, char *key[])
 719 {
 720   int result = 0;
 721   int i;
 722   struct rpcent *rpc;
 723
 724   if (number == 0)
 725     {
 726       setrpcent (0);
 727       while ((rpc = getrpcent ()) != NULL)
 728         print_rpc (rpc);
 729       endrpcent ();
 730       return result;
 731     }
 732
 733   for (i = 0; i < number; ++i)
 734     {
 735       if (isdigit (key[i][0]))
 736         rpc = getrpcbynumber (atol (key[i]));
 737       else
 738         rpc = getrpcbyname (key[i]);
 739
 740       if (rpc == NULL)
 741         result = 2;
 742       else
 743         print_rpc (rpc);
 744     }
 745
 746   return result;
 747 }
 748
 749 /* for services */
 750 static void
 751 print_services (struct servent *serv)
 752 {
 753   unsigned int i;
 754
 755   printf ("%-21s %d/%s", serv->s_name, ntohs (serv->s_port), serv->s_proto);
 756
 757   i = 0;
 758   while (serv->s_aliases[i] != NULL)
 759     {
 760       putchar_unlocked (' ');
 761       fputs_unlocked (serv->s_aliases[i], stdout);
 762       ++i;
 763     }
 764   putchar_unlocked ('\n');
 765 }
 766
 767 static int
 768 services_keys (int number, char *key[])
 769 {
 770   int result = 0;
 771   int i;
 772   struct servent *serv;
 773
 774   if (!number)
 775     {
 776       setservent (0);
 777       while ((serv = getservent ()) != NULL)
 778         print_services (serv);
 779       endservent ();
 780       return result;
 781     }
 782
 783   for (i = 0; i < number; ++i)
 784     {
 785       struct servent *serv;
 786       char *proto = strchr (key[i], '/');
 787
 788       if (proto != NULL)
 789         *proto++ = '\0';
 790
 791       if (isdigit (key[i][0]))
 792         serv = getservbyport (htons (atol (key[i])), proto);
 793       else
 794         serv = getservbyname (key[i], proto);
 795
 796       if (serv == NULL)
 797         result = 2;
 798       else
 799         print_services (serv);
 800     }
 801
 802   return result;
 803 }
 804
 805 /* This is for shadow */
 806 static void
 807 print_shadow (struct spwd *sp)
 808 {
 809   printf ("%s:%s:",
 810           sp->sp_namp ? sp->sp_namp : "",
 811           sp->sp_pwdp ? sp->sp_pwdp : "");
 812
 813 #define SHADOW_FIELD(n) \
 814   if (sp->n == -1)                                                            \
 815     putchar_unlocked (':');                                                   \
 816   else                                                                        \
 817     printf ("%ld:", sp->n)
 818
 819   SHADOW_FIELD (sp_lstchg);
 820   SHADOW_FIELD (sp_min);
 821   SHADOW_FIELD (sp_max);
 822   SHADOW_FIELD (sp_warn);
 823   SHADOW_FIELD (sp_inact);
 824   SHADOW_FIELD (sp_expire);
 825   if (sp->sp_flag == ~0ul)
 826     putchar_unlocked ('\n');
 827   else
 828     printf ("%lu\n", sp->sp_flag);
 829 }
 830
 831 static int
 832 shadow_keys (int number, char *key[])
 833 {
 834   int result = 0;
 835   int i;
 836
 837   if (number == 0)
 838     {
 839       struct spwd *sp;
 840
 841       setspent ();
 842       while ((sp = getspent ()) != NULL)
 843         print_shadow (sp);
 844       endspent ();
 845       return result;
 846     }
 847
 848   for (i = 0; i < number; ++i)
 849     {
 850       struct spwd *sp;
 851
 852       sp = getspnam (key[i]);
 853
 854       if (sp == NULL)
 855         result = 2;
 856       else
 857         print_shadow (sp);
 858     }
 859
 860   return result;
 861 }
 862
 863 struct
 864   {
 865     const char *name;
 866     int (*func) (int number, char *key[]);
 867   } databases[] =
 868   {
 869 #define D(name) { #name, name ## _keys },
 870 D(ahosts)
 871 D(ahostsv4)
 872 D(ahostsv6)
 873 D(aliases)
 874 D(ethers)
 875 D(group)
 876 D(gshadow)
 877 D(hosts)
 878 D(initgroups)
 879 D(netgroup)
 880 D(networks)
 881 D(passwd)
 882 D(protocols)
 883 D(rpc)
 884 D(services)
 885 D(shadow)
 886 #undef D
 887     { NULL, NULL }
 888   };
 889
 890 /* Handle arguments found by argp. */
 891 static error_t
 892 parse_option (int key, char *arg, struct argp_state *state)
 893 {
 894   char *endp;
 895   switch (key)
 896     {
 897     case 's':
 898       endp = strchr (arg, ':');
 899       if (endp == NULL)
 900         /* No specific database, change them all.  */
 901         for (int i = 0; databases[i].name != NULL; ++i)
 902           __nss_configure_lookup (databases[i].name, arg);
 903       else
 904         {
 905           int i;
 906           for (i = 0; databases[i].name != NULL; ++i)
 907             if (strncmp (databases[i].name, arg, endp - arg) == 0)
 908               {
 909                 __nss_configure_lookup (databases[i].name, endp + 1);
 910                 break;
 911               }
 912           if (databases[i].name == NULL)
 913             error (EXIT_FAILURE, 0, gettext ("Unknown database name"));
 914         }
 915       break;
 916
 917     case 'i':
 918       idn_flags = 0;
 919       break;
 920
 921     default:
 922       return ARGP_ERR_UNKNOWN;
 923     }
 924
 925   return 0;
 926 }
 927
 928
 929 static char *
 930 more_help (int key, const char *text, void *input)
 931 {
 932   switch (key)
 933     {
 934       size_t len;
 935       char *doc;
 936       FILE *fp;
 937
 938     case ARGP_KEY_HELP_EXTRA:
 939       /* We print some extra information.  */
 940       fp = open_memstream (&doc, &len);
 941       if (fp != NULL)
 942         {
 943           fputs_unlocked (_("Supported databases:\n"), fp);
 944
 945           for (int i = 0, col = 0; databases[i].name != NULL; ++i)
 946             {
 947               len = strlen (databases[i].name);
 948               if (i != 0)
 949                 {
 950                   if (col + len > 72)
 951                     {
 952                       col = 0;
 953                       fputc_unlocked ('\n', fp);
 954                     }
 955                   else
 956                     fputc_unlocked (' ', fp);
 957                 }
 958
 959               fputs_unlocked (databases[i].name, fp);
 960               col += len + 1;
 961             }
 962
 963           fputs ("\n\n", fp);
 964
 965           fprintf (fp, gettext ("\
 966 For bug reporting instructions, please see:\n\
 967 %s.\n"), REPORT_BUGS_TO);
 968
 969           if (fclose (fp) == 0)
 970             return doc;
 971         }
 972       break;
 973
 974     default:
 975       break;
 976     }
 977   return (char *) text;
 978 }
 979
 980
 981 /* the main function */
 982 int
 983 main (int argc, char *argv[])
 984 {
 985   /* Debugging support.  */
 986   mtrace ();
 987
 988   /* Set locale via LC_ALL.  */
 989   setlocale (LC_ALL, "");
 990   /* Set the text message domain.  */
 991   textdomain (PACKAGE);
 992
 993   /* Parse and process arguments.  */
 994   int remaining;
 995   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 996
 997   if ((argc - remaining) < 1)
 998     {
 999       error (0, 0, gettext ("wrong number of arguments"));
1000       argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
1001       return 1;
1002     }
1003
1004   for (int i = 0; databases[i].name; ++i)
1005     if (argv[remaining][0] == databases[i].name[0]
1006         && !strcmp (argv[remaining], databases[i].name))
1007       return databases[i].func (argc - remaining - 1, &argv[remaining + 1]);
1008
1009   fprintf (stderr, _("Unknown database: %s\n"), argv[remaining]);
1010   argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
1011   return 1;
1012 }