nss/getent.c

   1 /* Copyright (c) 1998-2003, 2004 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 "), "2004");
  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:%lu:", 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       errno = 0;
 210       char *ep;
 211       gid_t arg_gid = strtoul(key[i], &ep, 10);
 212
 213       if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
 214         /* Valid numeric gid.  */
 215         grp = getgrgid (arg_gid);
 216       else
 217         grp = getgrnam (key[i]);
 218
 219       if (grp == NULL)
 220         result = 2;
 221       else
 222         print_group (grp);
 223     }
 224
 225   return result;
 226 }
 227
 228 /* This is for hosts */
 229 static void
 230 print_hosts (struct hostent *host)
 231 {
 232   unsigned int cnt;
 233
 234   for (cnt = 0; host->h_addr_list[cnt] != NULL; ++cnt)
 235     {
 236       char buf[INET6_ADDRSTRLEN];
 237       const char *ip = inet_ntop (host->h_addrtype, host->h_addr_list[cnt],
 238                                   buf, sizeof (buf));
 239
 240       printf ("%-15s %s", ip, host->h_name);
 241
 242       unsigned int i;
 243       for (i = 0; host->h_aliases[i] != NULL; ++i)
 244         {
 245           putchar_unlocked (' ');
 246           fputs_unlocked (host->h_aliases[i], stdout);
 247         }
 248       putchar_unlocked ('\n');
 249     }
 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 hosts, but using getaddrinfo */
 297 static int
 298 ahosts_keys (int number, char *key[])
 299 {
 300   int result = 0;
 301   int i;
 302   struct hostent *host;
 303
 304   if (number == 0)
 305     {
 306       sethostent (0);
 307       while ((host = gethostent ()) != NULL)
 308         print_hosts (host);
 309       endhostent ();
 310       return result;
 311     }
 312
 313   struct addrinfo hint;
 314   memset (&hint, '\0', sizeof (hint));
 315   hint.ai_flags = AI_V4MAPPED | AI_ADDRCONFIG | AI_CANONNAME;
 316   hint.ai_family = AF_UNSPEC;
 317
 318   for (i = 0; i < number; ++i)
 319     {
 320       struct addrinfo *res;
 321
 322       if (getaddrinfo (key[i], NULL, &hint, &res) != 0)
 323         result = 2;
 324       else
 325         {
 326           struct addrinfo *runp = res;
 327
 328           while (runp != NULL)
 329             {
 330               char sockbuf[20];
 331               const char *sockstr;
 332               if (runp->ai_socktype == SOCK_STREAM)
 333                 sockstr = "STREAM";
 334               else if (runp->ai_socktype == SOCK_DGRAM)
 335                 sockstr = "DGRAM";
 336               else if (runp->ai_socktype == SOCK_RAW)
 337                 sockstr = "RAW";
 338               else
 339                 {
 340                   snprintf (sockbuf, sizeof (sockbuf), "%d",
 341                             runp->ai_socktype);
 342                   sockstr = sockbuf;
 343                 }
 344
 345               char buf[INET6_ADDRSTRLEN];
 346               printf ("%-15s %-6s %s\n",
 347                       inet_ntop (runp->ai_family,
 348                                  &((struct sockaddr_in *) runp->ai_addr)->sin_addr,
 349                                  buf, sizeof (buf)),
 350                       sockstr,
 351                       runp->ai_canonname);
 352
 353               runp = runp->ai_next;
 354             }
 355
 356           freeaddrinfo (res);
 357         }
 358     }
 359
 360   return result;
 361 }
 362
 363 /* This is for netgroup */
 364 static int
 365 netgroup_keys (int number, char *key[])
 366 {
 367   int result = 0;
 368   int i;
 369
 370   if (number == 0)
 371     {
 372       fprintf (stderr, _("Enumeration not supported on %s\n"), "netgroup");
 373       return 3;
 374     }
 375
 376   for (i = 0; i < number; ++i)
 377     {
 378       if (!setnetgrent (key[i]))
 379         result = 2;
 380       else
 381         {
 382           char *p[3];
 383
 384           printf ("%-21s", key[i]);
 385
 386           while (getnetgrent (p, p + 1, p + 2))
 387             printf (" (%s, %s, %s)", p[0] ?: " ", p[1] ?: "", p[2] ?: "");
 388           putchar_unlocked ('\n');
 389         }
 390     }
 391
 392   return result;
 393 }
 394
 395 /* This is for networks */
 396 static void
 397 print_networks (struct netent *net)
 398 {
 399   unsigned int i;
 400   struct in_addr ip;
 401   ip.s_addr = htonl (net->n_net);
 402
 403   printf ("%-21s %s", net->n_name, inet_ntoa (ip));
 404
 405   i = 0;
 406   while (net->n_aliases[i] != NULL)
 407     {
 408       putchar_unlocked (' ');
 409       fputs_unlocked (net->n_aliases[i], stdout);
 410       ++i;
 411       if (net->n_aliases[i] != NULL)
 412         putchar_unlocked (',');
 413     }
 414   putchar_unlocked ('\n');
 415 }
 416
 417 static int
 418 networks_keys (int number, char *key[])
 419 {
 420   int result = 0;
 421   int i;
 422   struct netent *net;
 423
 424   if (number == 0)
 425     {
 426       setnetent (0);
 427       while ((net = getnetent ()) != NULL)
 428         print_networks (net);
 429       endnetent ();
 430       return result;
 431     }
 432
 433   for (i = 0; i < number; ++i)
 434     {
 435       if (isdigit (key[i][0]))
 436         net = getnetbyaddr (inet_addr (key[i]), AF_UNIX);
 437       else
 438         net = getnetbyname (key[i]);
 439
 440       if (net == NULL)
 441         result = 2;
 442       else
 443         print_networks (net);
 444     }
 445
 446   return result;
 447 }
 448
 449 /* Now is all for passwd */
 450 static inline void
 451 print_passwd (struct passwd *pwd)
 452 {
 453   printf ("%s:%s:%lu:%lu:%s:%s:%s\n",
 454           pwd->pw_name ? pwd->pw_name : "",
 455           pwd->pw_passwd ? pwd->pw_passwd : "",
 456           (unsigned long int) pwd->pw_uid,
 457           (unsigned long int) pwd->pw_gid,
 458           pwd->pw_gecos ? pwd->pw_gecos : "",
 459           pwd->pw_dir ? pwd->pw_dir : "",
 460           pwd->pw_shell ? pwd->pw_shell : "");
 461 }
 462
 463 static int
 464 passwd_keys (int number, char *key[])
 465 {
 466   int result = 0;
 467   int i;
 468   struct passwd *pwd;
 469
 470   if (number == 0)
 471     {
 472       setpwent ();
 473       while ((pwd = getpwent ()) != NULL)
 474         print_passwd (pwd);
 475       endpwent ();
 476       return result;
 477     }
 478
 479   for (i = 0; i < number; ++i)
 480     {
 481       errno = 0;
 482       char *ep;
 483       uid_t arg_uid = strtoul(key[i], &ep, 10);
 484
 485       if (errno != EINVAL && *key[i] != '\0' && *ep == '\0')
 486         /* Valid numeric uid.  */
 487         pwd = getpwuid (arg_uid);
 488       else
 489         pwd = getpwnam (key[i]);
 490
 491       if (pwd == NULL)
 492         result = 2;
 493       else
 494         print_passwd (pwd);
 495     }
 496
 497   return result;
 498 }
 499
 500 /* This is for protocols */
 501 static inline void
 502 print_protocols (struct protoent *proto)
 503 {
 504   unsigned int i;
 505
 506   printf ("%-21s %d", proto->p_name, proto->p_proto);
 507
 508   i = 0;
 509   while (proto->p_aliases[i] != NULL)
 510     {
 511       putchar_unlocked (' ');
 512       fputs_unlocked (proto->p_aliases[i], stdout);
 513       ++i;
 514     }
 515   putchar_unlocked ('\n');
 516 }
 517
 518 static int
 519 protocols_keys (int number, char *key[])
 520 {
 521   int result = 0;
 522   int i;
 523   struct protoent *proto;
 524
 525   if (number == 0)
 526     {
 527       setprotoent (0);
 528       while ((proto = getprotoent ()) != NULL)
 529         print_protocols (proto);
 530       endprotoent ();
 531       return result;
 532     }
 533
 534   for (i = 0; i < number; ++i)
 535     {
 536       if (isdigit (key[i][0]))
 537         proto = getprotobynumber (atol (key[i]));
 538       else
 539         proto = getprotobyname (key[i]);
 540
 541       if (proto == NULL)
 542         result = 2;
 543       else
 544         print_protocols (proto);
 545     }
 546
 547   return result;
 548 }
 549
 550 /* Now is all for rpc */
 551 static inline void
 552 print_rpc (struct rpcent *rpc)
 553 {
 554   int i;
 555
 556   printf ("%-15s %d%s",
 557           rpc->r_name, rpc->r_number, rpc->r_aliases[0] ? " " : "");
 558
 559   for (i = 0; rpc->r_aliases[i]; ++i)
 560     printf (" %s", rpc->r_aliases[i]);
 561   putchar_unlocked ('\n');
 562 }
 563
 564 static int
 565 rpc_keys (int number, char *key[])
 566 {
 567   int result = 0;
 568   int i;
 569   struct rpcent *rpc;
 570
 571   if (number == 0)
 572     {
 573       setrpcent (0);
 574       while ((rpc = getrpcent ()) != NULL)
 575         print_rpc (rpc);
 576       endrpcent ();
 577       return result;
 578     }
 579
 580   for (i = 0; i < number; ++i)
 581     {
 582       if (isdigit (key[i][0]))
 583         rpc = getrpcbynumber (atol (key[i]));
 584       else
 585         rpc = getrpcbyname (key[i]);
 586
 587       if (rpc == NULL)
 588         result = 2;
 589       else
 590         print_rpc (rpc);
 591     }
 592
 593   return result;
 594 }
 595
 596 /* for services */
 597 static void
 598 print_services (struct servent *serv)
 599 {
 600   unsigned int i;
 601
 602   printf ("%-21s %d/%s", serv->s_name, ntohs (serv->s_port), serv->s_proto);
 603
 604   i = 0;
 605   while (serv->s_aliases[i] != NULL)
 606     {
 607       putchar_unlocked (' ');
 608       fputs_unlocked (serv->s_aliases[i], stdout);
 609       ++i;
 610     }
 611   putchar_unlocked ('\n');
 612 }
 613
 614 static int
 615 services_keys (int number, char *key[])
 616 {
 617   int result = 0;
 618   int i;
 619   struct servent *serv;
 620
 621   if (!number)
 622     {
 623       setservent (0);
 624       while ((serv = getservent ()) != NULL)
 625         print_services (serv);
 626       endservent ();
 627       return result;
 628     }
 629
 630   for (i = 0; i < number; ++i)
 631     {
 632       struct servent *serv;
 633       char *proto = strchr (key[i], '/');
 634
 635       if (proto != NULL)
 636         *proto++ = '\0';
 637
 638       if (isdigit (key[i][0]))
 639         serv = getservbyport (htons (atol (key[i])), proto);
 640       else
 641         serv = getservbyname (key[i], proto);
 642
 643       if (serv == NULL)
 644         result = 2;
 645       else
 646         print_services (serv);
 647     }
 648
 649   return result;
 650 }
 651
 652 /* This is for shadow */
 653 static void
 654 print_shadow (struct spwd *sp)
 655 {
 656   printf ("%s:%s:",
 657           sp->sp_namp ? sp->sp_namp : "",
 658           sp->sp_pwdp ? sp->sp_pwdp : "");
 659
 660 #define SHADOW_FIELD(n) \
 661   if (sp->n == -1)                                                            \
 662     putchar_unlocked (':');                                                   \
 663   else                                                                        \
 664     printf ("%ld:", sp->n)
 665
 666   SHADOW_FIELD (sp_lstchg);
 667   SHADOW_FIELD (sp_min);
 668   SHADOW_FIELD (sp_max);
 669   SHADOW_FIELD (sp_warn);
 670   SHADOW_FIELD (sp_inact);
 671   SHADOW_FIELD (sp_expire);
 672   if (sp->sp_flag == ~0ul)
 673     putchar_unlocked ('\n');
 674   else
 675     printf ("%lu\n", sp->sp_flag);
 676 }
 677
 678 static int
 679 shadow_keys (int number, char *key[])
 680 {
 681   int result = 0;
 682   int i;
 683
 684   if (number == 0)
 685     {
 686       struct spwd *sp;
 687
 688       setspent ();
 689       while ((sp = getspent ()) != NULL)
 690         print_shadow (sp);
 691       endpwent ();
 692       return result;
 693     }
 694
 695   for (i = 0; i < number; ++i)
 696     {
 697       struct spwd *sp;
 698
 699       sp = getspnam (key[i]);
 700
 701       if (sp == NULL)
 702         result = 2;
 703       else
 704         print_shadow (sp);
 705     }
 706
 707   return result;
 708 }
 709
 710 struct
 711   {
 712     const char *name;
 713     int (*func) (int number, char *key[]);
 714   } databases[] =
 715   {
 716 #define D(name) { #name, name ## _keys },
 717 D(ahosts)
 718 D(aliases)
 719 D(ethers)
 720 D(group)
 721 D(hosts)
 722 D(netgroup)
 723 D(networks)
 724 D(passwd)
 725 D(protocols)
 726 D(rpc)
 727 D(services)
 728 D(shadow)
 729 #undef D
 730     { NULL, NULL }
 731   };
 732
 733 /* Handle arguments found by argp. */
 734 static error_t
 735 parse_option (int key, char *arg, struct argp_state *state)
 736 {
 737   int i;
 738   switch (key)
 739     {
 740     case 's':
 741       for (i = 0; databases[i].name; ++i)
 742         __nss_configure_lookup (databases[i].name, arg);
 743       break;
 744
 745     default:
 746       return ARGP_ERR_UNKNOWN;
 747     }
 748
 749   return 0;
 750 }
 751
 752 /* build doc */
 753 static void
 754 build_doc (void)
 755 {
 756   int i, j, len;
 757   char *short_doc, *long_doc, *doc, *p;
 758
 759   short_doc = _("getent - get entries from administrative database.");
 760   long_doc = _("Supported databases:");
 761   len = strlen (short_doc) + strlen (long_doc) + 3;
 762
 763   for (i = 0; databases[i].name; ++i)
 764     len += strlen (databases[i].name) + 1;
 765
 766   doc = (char *) malloc (len);
 767   if (doc == NULL)
 768     doc = short_doc;
 769   else
 770     {
 771       p = stpcpy (doc, short_doc);
 772       *p++ = '\v';
 773       p = stpcpy (p, long_doc);
 774       *p++ = '\n';
 775
 776       for (i = 0, j = 0; databases[i].name; ++i)
 777         {
 778           len = strlen (databases[i].name);
 779           if (i != 0)
 780             {
 781               if (j + len > 72)
 782                 {
 783                   j = 0;
 784                   *p++ = '\n';
 785                 }
 786               else
 787                 *p++ = ' ';
 788             }
 789
 790           p = mempcpy (p, databases[i].name, len);
 791           j += len + 1;
 792         }
 793     }
 794
 795   argp.doc = doc;
 796 }
 797
 798 /* the main function */
 799 int
 800 main (int argc, char *argv[])
 801 {
 802   int remaining, i;
 803
 804   /* Set locale via LC_ALL.  */
 805   setlocale (LC_ALL, "");
 806   /* Set the text message domain.  */
 807   textdomain (PACKAGE);
 808
 809   /* Build argp.doc.  */
 810   build_doc ();
 811
 812   /* Parse and process arguments.  */
 813   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
 814
 815   if ((argc - remaining) < 1)
 816     {
 817       error (0, 0, gettext ("wrong number of arguments"));
 818       argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
 819       return 1;
 820     }
 821
 822   for (i = 0; databases[i].name; ++i)
 823     if (argv[remaining][0] == databases[i].name[0]
 824         && !strcmp (argv[remaining], databases[i].name))
 825       return databases[i].func (argc - remaining - 1, &argv[remaining + 1]);
 826
 827   fprintf (stderr, _("Unknown database: %s\n"), argv[remaining]);
 828   argp_help (&argp, stdout, ARGP_HELP_SEE, program_invocation_short_name);
 829   return 1;
 830 }