nss/getent.c

   1 /* Copyright (c) 1998, 1999, 2000, 2001, 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* getent: get entries from administrative database.  */
  21
  22 #include <aliases.h>
  23 #include <argp.h>
  24 #include <grp.h>
  25 #include <pwd.h>
  26 #include <shadow.h>
  27 #include <ctype.h>
  28 #include <error.h>
  29 #include <libintl.h>
  30 #include <locale.h>
  31 #include <netdb.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sys/socket.h>
  36 #include <netinet/in.h>
  37 #include <netinet/ether.h>
  38 #include <arpa/inet.h>
  39 #include <arpa/nameser.h>
  40
  41 /* Get libc version number.  */
  42 #include <version.h>
  43
  44 #define PACKAGE _libc_intl_domainname
  45
  46 /* Name and version of program.  */
  47 static void print_version (FILE *stream, struct argp_state *state);
  48 void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
  49
  50 /* Short description of parameters.  */
  51 static const char args_doc[] = N_("database [key ...]");
  52
  53 /* Supported options. */
  54 static const struct argp_option args_options[] =
  55   {
  56     { "service", 's', "CONFIG", 0, N_("Service configuration to be used") },
  57     { NULL, 0, NULL, 0, NULL },
  58   };
  59
  60 /* Prototype for option handler.  */
  61 static error_t parse_option (int key, char *arg, struct argp_state *state);
  62
  63 /* Data structure to communicate with argp functions.  */
  64 static struct argp argp =
  65   {
  66     args_options, parse_option, args_doc, NULL,
  67   };
  68
  69 /* Print the version information.  */
  70 static void
  71 print_version (FILE *stream, struct argp_state *state)
  72 {
  73   fprintf (stream, "getent (GNU %s) %s\n", PACKAGE, VERSION);
  74   fprintf (stream, gettext ("\
  75 Copyright (C) %s Free Software Foundation, Inc.\n\
  76 This is free software; see the source for copying conditions.  There is NO\n\
  77 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
  78 "), "2002");
  79   fprintf (stream, gettext ("Written by %s.\n"), "Thorsten Kukuk");
  80 }
  81
  82 /* This is for aliases */
  83 static inline void
  84 print_aliases (struct aliasent *alias)
  85 {
  86   unsigned int i = 0;
  87
  88   printf ("%s: ", alias->alias_name);
  89   for  (i = strlen (alias->alias_name); i < 14; ++i)
  90     fputs_unlocked (" ", stdout);
  91
  92   for (i = 0; i < alias->alias_members_len; ++i)
  93     printf ("%s%s",
  94             alias->alias_members [i],
  95             i + 1 == alias->alias_members_len ? "\n" : ", ");
  96 }
  97
  98 static int
  99 aliases_keys (int number, char *key[])
 100 {
 101   int result = 0;
 102   int i;
 103   struct aliasent *alias;
 104
 105   if (number == 0)
 106     {
 107       setaliasent ();
 108       while ((alias = getaliasent ()) != NULL)
 109         print_aliases (alias);
 110       endaliasent ();
 111       return result;
 112     }
 113
 114   for (i = 0; i < number; ++i)
 115     {
 116       alias = getaliasbyname (key[i]);
 117
 118       if (alias == NULL)
 119         result = 2;
 120       else
 121         print_aliases (alias);
 122     }
 123
 124   return result;
 125 }
 126
 127 /* This is for ethers */
 128 static int
 129 ethers_keys (int number, char *key[])
 130 {
 131   int result = 0;
 132   int i;
 133
 134   if (number == 0)
 135     {
 136       fprintf (stderr, _("Enumeration not supported on %s\n"), "ethers");
 137       return 3;
 138     }
 139
 140   for (i = 0; i < number; ++i)
 141     {
 142       struct ether_addr *ethp, eth;
 143       char buffer [1024], *p;
 144
 145       ethp = ether_aton (key[i]);
 146       if (ethp != NULL)
 147         {
 148           if (ether_ntohost (buffer, ethp))
 149             {
 150               result = 2;
 151               continue;
 152             }
 153           p = buffer;
 154         }
 155       else
 156         {
 157           if (ether_hostton (key[i], &eth))
 158             {
 159               result = 2;
 160               continue;
 161             }
 162           p = key[i];
 163           ethp = &eth;
 164         }
 165       printf ("%s %s\n", ether_ntoa (ethp), p);
 166     }
 167
 168   return result;
 169 }
 170
 171 /* This is for group */
 172 static inline void
 173 print_group (struct group *grp)
 174 {
 175   unsigned int i = 0;
 176
 177   printf ("%s:%s:%ld:", grp->gr_name ? grp->gr_name : "",
 178           grp->gr_passwd ? grp->gr_passwd : "",
 179           (unsigned long int) grp->gr_gid);
 180
 181   while (grp->gr_mem[i] != NULL)
 182     {
 183       fputs_unlocked (grp->gr_mem[i], stdout);
 184       ++i;
 185       if (grp->gr_mem[i] != NULL)
 186         putchar_unlocked (',');
 187     }
 188   putchar_unlocked ('\n');
 189 }
 190
 191 static int
 192 group_keys (int number, char *key[])
 193 {
 194   int result = 0;
 195   int i;
 196   struct group *grp;
 197
 198   if (number == 0)
 199     {
 200       setgrent ();
 201       while ((grp = getgrent ()) != NULL)
 202         print_group (grp);
 203       endgrent ();
 204       return result;
 205     }
 206
 207   for (i = 0; i < number; ++i)
 208     {
 209       if (isdigit (key[i][0]))
 210         {
 211            char *ep;
 212            gid_t arg_gid = strtoul (key[i], &ep, 10);
 213
 214            if (*key[i] != '\0' && *ep == '\0')  /* valid numeric uid */
 215              grp = getgrgid (arg_gid);
 216            else
 217              grp = NULL;
 218         }
 219       else
 220         grp = getgrnam (key[i]);
 221
 222       if (grp == NULL)
 223         result = 2;
 224       else
 225         print_group (grp);
 226     }
 227
 228   return result;
 229 }
 230
 231 /* This is for hosts */
 232 static inline void
 233 print_hosts (struct hostent *host)
 234 {
 235   unsigned int i;
 236   char buf[INET6_ADDRSTRLEN];
 237   const char *ip = inet_ntop (host->h_addrtype, host->h_addr_list[0],
 238                               buf, sizeof (buf));
 239
 240   printf ("%-15s %s", ip, host->h_name);
 241
 242   i = 0;
 243   while (host->h_aliases[i] != NULL)
 244     {
 245       putchar_unlocked (' ');
 246       fputs_unlocked (host->h_aliases[i], stdout);
 247       ++i;
 248     }
 249   putchar_unlocked ('\n');
 250 }
 251
 252 static int
 253 hosts_keys (int number, char *key[])
 254 {
 255   int result = 0;
 256   int i;
 257   struct hostent *host;
 258
 259   if (number == 0)
 260     {
 261       sethostent (0);
 262       while ((host = gethostent ()) != NULL)
 263         print_hosts (host);
 264       endhostent ();
 265       return result;
 266     }
 267
 268   for (i = 0; i < number; ++i)
 269     {
 270       struct hostent *host = NULL;
 271
 272       if (strchr (key[i], ':') != NULL)
 273         {
 274           char addr[IN6ADDRSZ];
 275           if (inet_pton (AF_INET6, key[i], &addr))
 276             host = gethostbyaddr (addr, sizeof (addr), AF_INET6);
 277         }
 278       else if (isdigit (key[i][0]))
 279         {
 280           char addr[INADDRSZ];
 281           if (inet_pton (AF_INET, key[i], &addr))
 282             host = gethostbyaddr (addr, sizeof (addr), AF_INET);
 283         }
 284       else if ((host = gethostbyname2 (key[i], AF_INET6)) == NULL)
 285         host = gethostbyname2 (key[i], AF_INET);
 286
 287       if (host == NULL)
 288         result = 2;
 289       else
 290         print_hosts (host);
 291     }
 292
 293   return result;
 294 }
 295
 296 /* This is for netgroup */
 297 static int
 298 netgroup_keys (int number, char *key[])
 299 {
 300   int result = 0;
 301   int i;
 302
 303   if (number == 0)
 304     {
 305       fprintf (stderr, _("Enumeration not supported on %s\n"), "netgroup");
 306       return 3;
 307     }
 308
 309   for (i = 0; i < number; ++i)
 310     {
 311       if (!setnetgrent (key[i]))
 312         result = 2;
 313       else
 314         {
 315           char *p[3];
 316
 317           printf ("%-21s", key[i]);
 318
 319           while (getnetgrent (p, p + 1, p + 2))
 320             printf (" (%s, %s, %s)", p[0] ?: " ", p[1] ?: "", p[2] ?: "");
 321           putchar_unlocked ('\n');
 322         }
 323     }
 324
 325   return result;
 326 }
 327
 328 /* This is for networks */
 329 static inline void
 330 print_networks (struct netent *net)
 331 {
 332   unsigned int i;
 333   struct in_addr ip;
 334   ip.s_addr = htonl (net->n_net);
 335
 336   printf ("%-21s %s", net->n_name, inet_ntoa (ip));
 337
 338   i = 0;
 339   while (net->n_aliases[i] != NULL)
 340     {
 341       putchar_unlocked (' ');
 342       fputs_unlocked (net->n_aliases[i], stdout);
 343       ++i;
 344       if (net->n_aliases[i] != NULL)
 345         putchar_unlocked (',');
 346     }
 347   putchar_unlocked ('\n');
 348 }
 349
 350 static int
 351 networks_keys (int number, char *key[])
 352 {
 353   int result = 0;
 354   int i;
 355   struct netent *net;
 356
 357   if (number == 0)
 358     {
 359       setnetent (0);
 360       while ((net = getnetent ()) != NULL)
 361         print_networks (net);
 362       endnetent ();
 363       return result;
 364     }
 365
 366   for (i = 0; i < number; ++i)
 367     {
 368       if (isdigit (key[i][0]))
 369         net = getnetbyaddr (inet_addr (key[i]), AF_UNIX);
 370       else
 371         net = getnetbyname (key[i]);
 372
 373       if (net == NULL)
 374         result = 2;
 375       else
 376         print_networks (net);
 377     }
 378
 379   return result;
 380 }
 381
 382 /* Now is all for passwd */
 383 static inline void
 384 print_passwd (struct passwd *pwd)
 385 {
 386   printf ("%s:%s:%ld:%ld:%s:%s:%s\n",
 387           pwd->pw_name ? pwd->pw_name : "",
 388           pwd->pw_passwd ? pwd->pw_passwd : "",
 389           (unsigned long int) pwd->pw_uid,
 390           (unsigned long int) pwd->pw_gid,
 391           pwd->pw_gecos ? pwd->pw_gecos : "",
 392           pwd->pw_dir ? pwd->pw_dir : "",
 393           pwd->pw_shell ? pwd->pw_shell : "");
 394 }
 395
 396 static int
 397 passwd_keys (int number, char *key[])
 398 {
 399   int result = 0;
 400   int i;
 401   struct passwd *pwd;
 402
 403   if (number == 0)
 404     {
 405       setpwent ();
 406       while ((pwd = getpwent ()) != NULL)
 407         print_passwd (pwd);
 408       endpwent ();
 409       return result;
 410     }
 411
 412   for (i = 0; i < number; ++i)
 413     {
 414       if (isdigit (key[i][0]))
 415         {
 416            char *ep;
 417            uid_t arg_uid = strtoul (key[i], &ep, 10);
 418
 419            if (*key[i] != '\0' && *ep == '\0')  /* valid numeric uid */
 420              pwd = getpwuid (arg_uid);
 421            else
 422              pwd = NULL;
 423         }
 424       else
 425         pwd = getpwnam (key[i]);
 426
 427       if (pwd == NULL)
 428         result = 2;
 429       else
 430         print_passwd (pwd);
 431     }
 432
 433   return result;
 434 }
 435
 436 /* This is for protocols */
 437 static inline void
 438 print_protocols (struct protoent *proto)
 439 {
 440   unsigned int i;
 441
 442   printf ("%-21s %d", proto->p_name, proto->p_proto);
 443
 444   i = 0;
 445   while (proto->p_aliases[i] != NULL)
 446     {
 447       putchar_unlocked (' ');
 448       fputs_unlocked (proto->p_aliases[i], stdout);
 449       ++i;
 450     }
 451   putchar_unlocked ('\n');
 452 }
 453
 454 static int
 455 protocols_keys (int number, char *key[])
 456 {
 457   int result = 0;
 458   int i;
 459   struct protoent *proto;
 460
 461   if (number == 0)
 462     {
 463       setprotoent (0);
 464       while ((proto = getprotoent ()) != NULL)
 465         print_protocols (proto);
 466       endprotoent ();
 467       return result;
 468     }
 469
 470   for (i = 0; i < number; ++i)
 471     {
 472       if (isdigit (key[i][0]))
 473         proto = getprotobynumber (atol (key[i]));
 474       else
 475         proto = getprotobyname (key[i]);
 476
 477       if (proto == NULL)
 478         result = 2;
 479       else
 480         print_protocols (proto);
 481     }
 482
 483   return result;
 484 }
 485
 486 /* Now is all for rpc */
 487 static inline void
 488 print_rpc (struct rpcent *rpc)
 489 {
 490   int i;
 491
 492   printf ("%-15s %d%s",
 493           rpc->r_name, rpc->r_number, rpc->r_aliases[0] ? " " : "");
 494
 495   for (i = 0; rpc->r_aliases[i]; ++i)
 496     printf (" %s", rpc->r_aliases[i]);
 497   putchar_unlocked ('\n');
 498 }
 499
 500 static int
 501 rpc_keys (int number, char *key[])
 502 {
 503   int result = 0;
 504   int i;
 505   struct rpcent *rpc;
 506
 507   if (number == 0)
 508     {
 509       setrpcent (0);
 510       while ((rpc = getrpcent ()) != NULL)
 511         print_rpc (rpc);
 512       endrpcent ();
 513       return result;
 514     }
 515
 516   for (i = 0; i < number; ++i)
 517     {
 518       if (isdigit (key[i][0]))
 519         rpc = getrpcbynumber (atol (key[i]));
 520       else
 521         rpc = getrpcbyname (key[i]);
 522
 523       if (rpc == NULL)
 524         result = 2;
 525       else
 526         print_rpc (rpc);
 527     }
 528
 529   return result;
 530 }
 531
 532 /* for services */
 533 static void
 534 print_services (struct servent *serv)
 535 {
 536   unsigned int i;
 537
 538   printf ("%-21s %d/%s", serv->s_name, ntohs (serv->s_port), serv->s_proto);
 539
 540   i = 0;
 541   while (serv->s_aliases[i] != NULL)
 542     {
 543       putchar_unlocked (' ');
 544       fputs_unlocked (serv->s_aliases[i], stdout);
 545       ++i;
 546     }
 547   putchar_unlocked ('\n');
 548 }
 549
 550 static int
 551 services_keys (int number, char *key[])
 552 {
 553   int result = 0;
 554   int i;
 555   struct servent *serv;
 556
 557   if (!number)
 558     {
 559       setservent (0);
 560       while ((serv = getservent ()) != NULL)
 561         print_services (serv);
 562       endservent ();
 563       return result;
 564     }
 565
 566   for (i = 0; i < number; ++i)
 567     {
 568       struct servent *serv;
 569       char *proto = strchr (key[i], '/');
 570
 571       if (proto == NULL)
 572         {
 573           setservent (0);
 574           if (isdigit (key[i][0]))
 575             {
 576               int port = htons (atol (key[i]));
 577               while ((serv = getservent ()) != NULL)
 578                 if (serv->s_port == port)
 579                   {
 580                     print_services (serv);
 581                     break;
 582                   }
 583             }
 584           else
 585             {
 586               int j;
 587
 588               while ((serv = getservent ()) != NULL)
 589                 if (strcmp (serv->s_name, key[i]) == 0)
 590                   {
 591                     print_services (serv);
 592                     break;
 593                   }
 594                 else
 595                   for (j = 0; serv->s_aliases[j]; ++j)
 596                     if (strcmp (serv->s_aliases[j], key[i]) == 0)
 597                       {
 598                         print_services (serv);
 599                         break;
 600                       }
 601             }
 602           endservent ();
 603         }
 604       else
 605         {
 606           *proto++ = '\0';
 607
 608           if (isdigit (key[i][0]))
 609             serv = getservbyport (htons (atol (key[i])), proto);
 610           else
 611             serv = getservbyname (key[i], proto);
 612
 613           if (serv == NULL)
 614             result = 2;
 615           else
 616             print_services (serv);
 617         }
 618     }
 619
 620   return result;
 621 }
 622
 623 /* This is for shadow */
 624 static inline void
 625 print_shadow (struct spwd *sp)
 626 {
 627   printf ("%s:%s:",
 628           sp->sp_namp ? sp->sp_namp : "",
 629           sp->sp_pwdp ? sp->sp_pwdp : "");
 630
 631 #define SHADOW_FIELD(n) \
 632   if (sp->n == -1)                                                            \
 633     putchar_unlocked (':');                                                   \
 634   else                                                                        \
 635     printf ("%ld:", sp->n)
 636
 637   SHADOW_FIELD (sp_lstchg);
 638   SHADOW_FIELD (sp_min);
 639   SHADOW_FIELD (sp_max);
 640   SHADOW_FIELD (sp_warn);
 641   SHADOW_FIELD (sp_inact);
 642   SHADOW_FIELD (sp_expire);
 643   if (sp->sp_flag == ~0ul)
 644     putchar_unlocked ('\n');
 645   else
 646     printf ("%lu\n", sp->sp_flag);
 647 }
 648
 649 static int
 650 shadow_keys (int number, char *key[])
 651 {
 652   int result = 0;
 653   int i;
 654
 655   if (number == 0)
 656     {
 657       struct spwd *sp;
 658
 659       setspent ();
 660       while ((sp = getspent ()) != NULL)
 661         print_shadow (sp);
 662       endpwent ();
 663       return result;
 664     }
 665
 666   for (i = 0; i < number; ++i)
 667     {
 668       struct spwd *sp;
 669
 670       sp = getspnam (key[i]);
 671
 672       if (sp == NULL)
 673         result = 2;
 674       else
 675         print_shadow (sp);
 676     }
 677
 678   return result;
 679 }
 680
 681 struct
 682   {
 683     const char *name;
 684     int (*func) (int number, char *key[]);
 685   } databases[] =
 686   {
 687 #define D(name) { #name, name ## _keys },
 688 D(aliases)
 689 D(ethers)
 690 D(group)
 691 D(hosts)
 692 D(netgroup)
 693 D(networks)
 694 D(passwd)
 695 D(protocols)
 696 D(rpc)
 697 D(services)
 698 D(shadow)
 699 #undef D
 700     { NULL, NULL }
 701   };
 702
 703 /* Handle arguments found by argp. */
 704 static error_t
 705 parse_option (int key, char *arg, struct argp_state *state)
 706 {
 707   int i;
 708   switch (key)
 709     {
 710     case 's':
 711       for (i = 0; databases[i].name; ++i)
 712         __nss_configure_lookup (databases[i].name, arg);
 713       break;
 714
 715     default:
 716       return ARGP_ERR_UNKNOWN;
 717     }
 718
 719   return 0;
 720 }
 721
 722 /* build doc */
 723 static inline void
 724 build_doc (void)
 725 {
 726   int i, j, len;
 727   char *short_doc, *long_doc, *doc, *p;
 728
 729   short_doc = _("getent - get entries from administrative database.");
 730   long_doc = _("Supported databases:");
 731   len = strlen (short_doc) + strlen (long_doc) + 3;
 732
 733   for (i = 0; databases[i].name; ++i)
 734     len += strlen (databases[i].name) + 1;
 735
 736   doc = (char *) malloc (len);
 737   if (doc == NULL)
 738     doc = short_doc;
 739   else
 740     {
 741       p = stpcpy (doc, short_doc);
 742       *p++ = '\v';
 743       p = stpcpy (p, long_doc);
 744       *p++ = '\n';
 745
 746       for (i = 0, j = 0; databases[i].name; ++i)
 747         {
 748           len = strlen (databases[i].name);
 749           if (i != 0)
 750             {
 751               if (j + len > 72)
 752                 {
 753                   j = 0;
 754                   *p++ = '\n';
 755                 }
 756               else
 757                 *p++ = ' ';
 758             }
 759
 760           p = mempcpy (p, databases[i].name, len);
 761           j += len + 1;
 762         }
 763     }
 764
 765   argp.doc = doc;
 766 }
 767
 768 /* the main function */
 769 int
 770 main (int argc, char *argv[])
 771 {
 772   int remaining, i;
 773
 774   /* Set locale via LC_ALL.  */
 775   setlocale (LC_ALL, "");
 776   /* Set the text message domain.  */
 777   textdomain (PACKAGE);
 778
 779   /* Build argp.doc.  */
 780   build_doc ();
 781
 782   /* Parse and process arguments.  */
 783   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 784
 785   if ((argc - remaining) < 1)
 786     {
 787       error (0, 0, gettext ("wrong number of arguments"));
 788       argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
 789       return 1;
 790     }
 791
 792   for (i = 0; databases[i].name; ++i)
 793     if (argv[remaining][0] == databases[i].name[0]
 794         && !strcmp (argv[remaining], databases[i].name))
 795       return databases[i].func (argc - remaining - 1, &argv[remaining + 1]);
 796
 797   fprintf (stderr, _("Unknown database: %s\n"), argv[remaining]);
 798   argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
 799   return 1;
 800 }