getent.c

   1 /*      $NetBSD: getent.c,v 1.7 2005/08/24 14:31:02 ginsbach Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <sys/socket.h>
  36 #include <sys/param.h>
  37 #include <arpa/inet.h>
  38 #include <arpa/nameser.h>
  39 #include <net/if.h>
  40 #include <netinet/if_ether.h>
  41 #include <netinet/in.h>         /* for INET6_ADDRSTRLEN */
  42 #include <rpc/rpcent.h>
  43
  44 #include <assert.h>
  45 #include <ctype.h>
  46 #include <errno.h>
  47 #include <grp.h>
  48 #include <limits.h>
  49 #include <netdb.h>
  50 #include <pwd.h>
  51 #include <stdarg.h>
  52 #include <stdint.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57 #include <utmpx.h>
  58
  59 static int      usage(void);
  60 static int      parsenum(const char *, unsigned long *);
  61 static int      ethers(int, char *[]);
  62 static int      group(int, char *[]);
  63 static int      hosts(int, char *[]);
  64 static int      networks(int, char *[]);
  65 static int      passwd(int, char *[]);
  66 static int      protocols(int, char *[]);
  67 static int      rpc(int, char *[]);
  68 static int      services(int, char *[]);
  69 static int      shells(int, char *[]);
  70 static int      utmpx(int, char *[]);
  71
  72 enum {
  73         RV_OK           = 0,
  74         RV_USAGE        = 1,
  75         RV_NOTFOUND     = 2,
  76         RV_NOENUM       = 3
  77 };
  78
  79 static struct getentdb {
  80         const char      *name;
  81         int             (*callback)(int, char *[]);
  82 } databases[] = {
  83         {       "ethers",       ethers,         },
  84         {       "group",        group,          },
  85         {       "hosts",        hosts,          },
  86         {       "networks",     networks,       },
  87         {       "passwd",       passwd,         },
  88         {       "protocols",    protocols,      },
  89         {       "rpc",          rpc,            },
  90         {       "services",     services,       },
  91         {       "shells",       shells,         },
  92         {       "utmpx",        utmpx,          },
  93
  94         {       NULL,           NULL,           },
  95 };
  96
  97 int
  98 main(int argc, char *argv[])
  99 {
 100         struct getentdb *curdb;
 101
 102         setprogname(argv[0]);
 103
 104         if (argc < 2)
 105                 usage();
 106         for (curdb = databases; curdb->name != NULL; curdb++) {
 107                 if (strcmp(curdb->name, argv[1]) == 0) {
 108                         exit(curdb->callback(argc, argv));
 109                 }
 110         }
 111         fprintf(stderr, "Unknown database: %s\n", argv[1]);
 112         usage();
 113         /* NOTREACHED */
 114         return RV_USAGE;
 115 }
 116
 117 static int
 118 usage(void)
 119 {
 120         struct getentdb *curdb;
 121
 122         fprintf(stderr, "Usage: %s database [key ...]\n",
 123             getprogname());
 124         fprintf(stderr, "       database may be one of:\n\t");
 125         for (curdb = databases; curdb->name != NULL; curdb++) {
 126                 fprintf(stderr, " %s", curdb->name);
 127         }
 128         fprintf(stderr, "\n");
 129         exit(RV_USAGE);
 130         /* NOTREACHED */
 131 }
 132
 133 static int
 134 parsenum(const char *word, unsigned long *result)
 135 {
 136         unsigned long   num;
 137         char            *ep;
 138
 139         assert(word != NULL);
 140         assert(result != NULL);
 141
 142         if (!isdigit((unsigned char)word[0]))
 143                 return 0;
 144         errno = 0;
 145         num = strtoul(word, &ep, 10);
 146         if (num == ULONG_MAX && errno == ERANGE)
 147                 return 0;
 148         if (*ep != '\0')
 149                 return 0;
 150         *result = num;
 151         return 1;
 152 }
 153
 154 /*
 155  * printfmtstrings --
 156  *      vprintf(format, ...),
 157  *      then the aliases (beginning with prefix, separated by sep),
 158  *      then a newline
 159  */
 160 static void
 161 printfmtstrings(char *strings[], const char *prefix, const char *sep,
 162         const char *fmt, ...)
 163 {
 164         va_list         ap;
 165         const char      *curpref;
 166         int             i;
 167
 168         va_start(ap, fmt);
 169         vprintf(fmt, ap);
 170
 171         curpref = prefix;
 172         for (i = 0; strings[i] != NULL; i++) {
 173                 printf("%s%s", curpref, strings[i]);
 174                 curpref = sep;
 175         }
 176         printf("\n");
 177         va_end(ap);
 178 }
 179
 180 /*
 181  * ethers
 182  */
 183 static int
 184 ethers(int argc, char *argv[])
 185 {
 186         char            hostname[MAXHOSTNAMELEN + 1], *hp;
 187         struct ether_addr ea, *eap;
 188         int             i, rv;
 189
 190         assert(argc > 1);
 191         assert(argv != NULL);
 192
 193 #define ETHERSPRINT     printf("%-17s  %s\n", ether_ntoa(eap), hp)
 194
 195         rv = RV_OK;
 196         if (argc == 2) {
 197                 fprintf(stderr, "Enumeration not supported on ethers\n");
 198                 rv = RV_NOENUM;
 199         } else {
 200                 for (i = 2; i < argc; i++) {
 201                         if ((eap = ether_aton(argv[i])) == NULL) {
 202                                 eap = &ea;
 203                                 hp = argv[i];
 204                                 if (ether_hostton(hp, eap) != 0) {
 205                                         rv = RV_NOTFOUND;
 206                                         break;
 207                                 }
 208                         } else {
 209                                 hp = hostname;
 210                                 if (ether_ntohost(hp, eap) != 0) {
 211                                         rv = RV_NOTFOUND;
 212                                         break;
 213                                 }
 214                         }
 215                         ETHERSPRINT;
 216                 }
 217         }
 218         return rv;
 219 }
 220
 221 /*
 222  * group
 223  */
 224
 225 static int
 226 group(int argc, char *argv[])
 227 {
 228         struct group    *gr;
 229         unsigned long   id;
 230         int             i, rv;
 231
 232         assert(argc > 1);
 233         assert(argv != NULL);
 234
 235 #define GROUPPRINT      printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
 236                             gr->gr_name, gr->gr_passwd, gr->gr_gid)
 237
 238         setgroupent(1);
 239         rv = RV_OK;
 240         if (argc == 2) {
 241                 while ((gr = getgrent()) != NULL)
 242                         GROUPPRINT;
 243         } else {
 244                 for (i = 2; i < argc; i++) {
 245                         if (parsenum(argv[i], &id))
 246                                 gr = getgrgid((gid_t)id);
 247                         else
 248                                 gr = getgrnam(argv[i]);
 249                         if (gr != NULL)
 250                                 GROUPPRINT;
 251                         else {
 252                                 rv = RV_NOTFOUND;
 253                                 break;
 254                         }
 255                 }
 256         }
 257         endgrent();
 258         return rv;
 259 }
 260
 261
 262 /*
 263  * hosts
 264  */
 265
 266 static void
 267 hostsprint(const struct hostent *he)
 268 {
 269         char    buf[INET6_ADDRSTRLEN];
 270
 271         assert(he != NULL);
 272         if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
 273                 strlcpy(buf, "# unknown", sizeof(buf));
 274         printfmtstrings(he->h_aliases, "  ", " ", "%-16s  %s", buf, he->h_name);
 275 }
 276
 277 static int
 278 hosts(int argc, char *argv[])
 279 {
 280         struct hostent  *he;
 281         char            addr[IN6ADDRSZ];
 282         int             i, rv;
 283
 284         assert(argc > 1);
 285         assert(argv != NULL);
 286
 287         sethostent(1);
 288         rv = RV_OK;
 289         if (argc == 2) {
 290                 while ((he = gethostent()) != NULL)
 291                         hostsprint(he);
 292         } else {
 293                 for (i = 2; i < argc; i++) {
 294                         if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0)
 295                                 he = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
 296                         else if (inet_pton(AF_INET, argv[i], (void *)addr) > 0)
 297                                 he = gethostbyaddr(addr, INADDRSZ, AF_INET);
 298                         else
 299                                 he = gethostbyname(argv[i]);
 300                         if (he != NULL)
 301                                 hostsprint(he);
 302                         else {
 303                                 rv = RV_NOTFOUND;
 304                                 break;
 305                         }
 306                 }
 307         }
 308         endhostent();
 309         return rv;
 310 }
 311
 312 /*
 313  * networks
 314  */
 315 static void
 316 networksprint(const struct netent *ne)
 317 {
 318         char            buf[INET6_ADDRSTRLEN];
 319         struct  in_addr ianet;
 320
 321         assert(ne != NULL);
 322         ianet = inet_makeaddr(ne->n_net, 0);
 323         if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
 324                 strlcpy(buf, "# unknown", sizeof(buf));
 325         printfmtstrings(ne->n_aliases, "  ", " ", "%-16s  %s", ne->n_name, buf);
 326 }
 327
 328 static int
 329 networks(int argc, char *argv[])
 330 {
 331         struct netent   *ne;
 332         in_addr_t       net;
 333         int             i, rv;
 334
 335         assert(argc > 1);
 336         assert(argv != NULL);
 337
 338         setnetent(1);
 339         rv = RV_OK;
 340         if (argc == 2) {
 341                 while ((ne = getnetent()) != NULL)
 342                         networksprint(ne);
 343         } else {
 344                 for (i = 2; i < argc; i++) {
 345                         net = inet_network(argv[i]);
 346                         if (net != INADDR_NONE)
 347                                 ne = getnetbyaddr(net, AF_INET);
 348                         else
 349                                 ne = getnetbyname(argv[i]);
 350                         if (ne != NULL)
 351                                 networksprint(ne);
 352                         else {
 353                                 rv = RV_NOTFOUND;
 354                                 break;
 355                         }
 356                 }
 357         }
 358         endnetent();
 359         return rv;
 360 }
 361
 362 /*
 363  * passwd
 364  */
 365 static int
 366 passwd(int argc, char *argv[])
 367 {
 368         struct passwd   *pw;
 369         unsigned long   id;
 370         int             i, rv;
 371
 372         assert(argc > 1);
 373         assert(argv != NULL);
 374
 375 #define PASSWDPRINT     printf("%s:%s:%u:%u:%s:%s:%s\n", \
 376                             pw->pw_name, pw->pw_passwd, pw->pw_uid, \
 377                             pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
 378
 379         setpassent(1);
 380         rv = RV_OK;
 381         if (argc == 2) {
 382                 while ((pw = getpwent()) != NULL)
 383                         PASSWDPRINT;
 384         } else {
 385                 for (i = 2; i < argc; i++) {
 386                         if (parsenum(argv[i], &id))
 387                                 pw = getpwuid((uid_t)id);
 388                         else
 389                                 pw = getpwnam(argv[i]);
 390                         if (pw != NULL)
 391                                 PASSWDPRINT;
 392                         else {
 393                                 rv = RV_NOTFOUND;
 394                                 break;
 395                         }
 396                 }
 397         }
 398         endpwent();
 399         return rv;
 400 }
 401
 402 /*
 403  * protocols
 404  */
 405 static int
 406 protocols(int argc, char *argv[])
 407 {
 408         struct protoent *pe;
 409         unsigned long   id;
 410         int             i, rv;
 411
 412         assert(argc > 1);
 413         assert(argv != NULL);
 414
 415 #define PROTOCOLSPRINT  printfmtstrings(pe->p_aliases, "  ", " ", \
 416                             "%-16s  %5d", pe->p_name, pe->p_proto)
 417
 418         setprotoent(1);
 419         rv = RV_OK;
 420         if (argc == 2) {
 421                 while ((pe = getprotoent()) != NULL)
 422                         PROTOCOLSPRINT;
 423         } else {
 424                 for (i = 2; i < argc; i++) {
 425                         if (parsenum(argv[i], &id))
 426                                 pe = getprotobynumber((int)id);
 427                         else
 428                                 pe = getprotobyname(argv[i]);
 429                         if (pe != NULL)
 430                                 PROTOCOLSPRINT;
 431                         else {
 432                                 rv = RV_NOTFOUND;
 433                                 break;
 434                         }
 435                 }
 436         }
 437         endprotoent();
 438         return rv;
 439 }
 440
 441 /*
 442  * rpc
 443  */
 444 static int
 445 rpc(int argc, char *argv[])
 446 {
 447         struct rpcent   *re;
 448         unsigned long   id;
 449         int             i, rv;
 450
 451         assert(argc > 1);
 452         assert(argv != NULL);
 453
 454 #define RPCPRINT        printfmtstrings(re->r_aliases, "  ", " ", \
 455                                 "%-16s  %6d", \
 456                                 re->r_name, re->r_number)
 457
 458         setrpcent(1);
 459         rv = RV_OK;
 460         if (argc == 2) {
 461                 while ((re = getrpcent()) != NULL)
 462                         RPCPRINT;
 463         } else {
 464                 for (i = 2; i < argc; i++) {
 465                         if (parsenum(argv[i], &id))
 466                                 re = getrpcbynumber((int)id);
 467                         else
 468                                 re = getrpcbyname(argv[i]);
 469                         if (re != NULL)
 470                                 RPCPRINT;
 471                         else {
 472                                 rv = RV_NOTFOUND;
 473                                 break;
 474                         }
 475                 }
 476         }
 477         endrpcent();
 478         return rv;
 479 }
 480
 481 /*
 482  * services
 483  */
 484 static int
 485 services(int argc, char *argv[])
 486 {
 487         struct servent  *se;
 488         unsigned long   id;
 489         char            *proto;
 490         int             i, rv;
 491
 492         assert(argc > 1);
 493         assert(argv != NULL);
 494
 495 #define SERVICESPRINT   printfmtstrings(se->s_aliases, "  ", " ", \
 496                             "%-16s  %5d/%s", \
 497                             se->s_name, ntohs(se->s_port), se->s_proto)
 498
 499         setservent(1);
 500         rv = RV_OK;
 501         if (argc == 2) {
 502                 while ((se = getservent()) != NULL)
 503                         SERVICESPRINT;
 504         } else {
 505                 for (i = 2; i < argc; i++) {
 506                         proto = strchr(argv[i], '/');
 507                         if (proto != NULL)
 508                                 *proto++ = '\0';
 509                         if (parsenum(argv[i], &id))
 510                                 se = getservbyport(htons((u_short)id), proto);
 511                         else
 512                                 se = getservbyname(argv[i], proto);
 513                         if (se != NULL)
 514                                 SERVICESPRINT;
 515                         else {
 516                                 rv = RV_NOTFOUND;
 517                                 break;
 518                         }
 519                 }
 520         }
 521         endservent();
 522         return rv;
 523 }
 524
 525 /*
 526  * shells
 527  */
 528 static int
 529 shells(int argc, char *argv[])
 530 {
 531         const char      *sh;
 532         int             i, rv;
 533
 534         assert(argc > 1);
 535         assert(argv != NULL);
 536
 537 #define SHELLSPRINT     printf("%s\n", sh)
 538
 539         setusershell();
 540         rv = RV_OK;
 541         if (argc == 2) {
 542                 while ((sh = getusershell()) != NULL)
 543                         SHELLSPRINT;
 544         } else {
 545                 for (i = 2; i < argc; i++) {
 546                         setusershell();
 547                         while ((sh = getusershell()) != NULL) {
 548                                 if (strcmp(sh, argv[i]) == 0) {
 549                                         SHELLSPRINT;
 550                                         break;
 551                                 }
 552                         }
 553                         if (sh == NULL) {
 554                                 rv = RV_NOTFOUND;
 555                                 break;
 556                         }
 557                 }
 558         }
 559         endusershell();
 560         return rv;
 561 }
 562
 563 /*
 564  * utmpx
 565  */
 566
 567 #define UTMPXPRINTID do {                       \
 568         size_t i;                               \
 569         for (i = 0; i < sizeof ut->ut_id; i++)  \
 570                 printf("%02hhx", ut->ut_id[i]); \
 571 } while (0)
 572
 573 static void
 574 utmpxprint(const struct utmpx *ut)
 575 {
 576
 577         if (ut->ut_type == EMPTY)
 578                 return;
 579
 580         printf("[%jd.%06u -- %.24s] ",
 581             (intmax_t)ut->ut_tv.tv_sec, (unsigned int)ut->ut_tv.tv_usec,
 582             ctime(&ut->ut_tv.tv_sec));
 583
 584         switch (ut->ut_type) {
 585         case BOOT_TIME:
 586                 printf("system boot\n");
 587                 return;
 588         case SHUTDOWN_TIME:
 589                 printf("system shutdown\n");
 590                 return;
 591         case OLD_TIME:
 592                 printf("old system time\n");
 593                 return;
 594         case NEW_TIME:
 595                 printf("new system time\n");
 596                 return;
 597         case USER_PROCESS:
 598                 printf("user process: id=\"");
 599                 UTMPXPRINTID;
 600                 printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
 601                     ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
 602                 break;
 603         case INIT_PROCESS:
 604                 printf("init process: id=\"");
 605                 UTMPXPRINTID;
 606                 printf("\" pid=\"%d\"\n", ut->ut_pid);
 607                 break;
 608         case LOGIN_PROCESS:
 609                 printf("login process: id=\"");
 610                 UTMPXPRINTID;
 611                 printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
 612                     ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
 613                 break;
 614         case DEAD_PROCESS:
 615                 printf("dead process: id=\"");
 616                 UTMPXPRINTID;
 617                 printf("\" pid=\"%d\"\n", ut->ut_pid);
 618                 break;
 619         default:
 620                 printf("unknown record type %hu\n", ut->ut_type);
 621                 break;
 622         }
 623 }
 624
 625 static int
 626 utmpx(int argc, char *argv[])
 627 {
 628         const struct utmpx *ut;
 629         const char *file = NULL;
 630         int rv = RV_OK, db = 0;
 631
 632         assert(argc > 1);
 633         assert(argv != NULL);
 634
 635         if (argc == 3 || argc == 4) {
 636                 if (strcmp(argv[2], "active") == 0)
 637                         db = UTXDB_ACTIVE;
 638                 else if (strcmp(argv[2], "lastlogin") == 0)
 639                         db = UTXDB_LASTLOGIN;
 640                 else if (strcmp(argv[2], "log") == 0)
 641                         db = UTXDB_LOG;
 642                 else
 643                         rv = RV_USAGE;
 644                 if (argc == 4)
 645                         file = argv[3];
 646         } else {
 647                 rv = RV_USAGE;
 648         }
 649
 650         if (rv == RV_USAGE) {
 651                 fprintf(stderr,
 652                     "Usage: %s utmpx active | lastlogin | log [filename]\n",
 653                     getprogname());
 654         } else if (rv == RV_OK) {
 655                 if (setutxdb(db, file) != 0)
 656                         return (RV_NOTFOUND);
 657                 while ((ut = getutxent()) != NULL)
 658                         utmpxprint(ut);
 659                 endutxent();
 660         }
 661         return (rv);
 662 }