1 /* $NetBSD: getent.c,v 1.19 2012/03/15 02:02:23 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 2004-2006 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 #ifndef lint
34 __RCSID("$NetBSD: getent.c,v 1.19 2012/03/15 02:02:23 joerg Exp $");
35 #endif /* not lint */
36
37 #include <sys/socket.h>
38
39 #include <assert.h>
40 #include <ctype.h>
41 #include <errno.h>
42 #include <grp.h>
43 #include <limits.h>
44 #include <netdb.h>
45 #include <netgroup.h>
46 #include <pwd.h>
47 #include <stdio.h>
48 #include <stdarg.h>
49 #include <stdbool.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <paths.h>
54 #include <err.h>
55
56 #include <arpa/inet.h>
57 #include <arpa/nameser.h>
58
59 #include <net/if.h>
60 #include <net/if_ether.h>
61
62 #include <netinet/in.h> /* for INET6_ADDRSTRLEN */
63
64 #if !defined(__minix)
65 #include <rpc/rpcent.h>
66 #endif /* !defined(__minix) */
67
68 #include <disktab.h>
69
70 static int usage(void) __attribute__((__noreturn__));
71 static int parsenum(const char *, unsigned long *);
72 static int disktab(int, char *[]);
73 static int gettytab(int, char *[]);
74 static int ethers(int, char *[]);
75 static int group(int, char *[]);
76 static int hosts(int, char *[]);
77 static int netgroup(int, char *[]);
78 static int networks(int, char *[]);
79 static int passwd(int, char *[]);
80 static int printcap(int, char *[]);
81 static int protocols(int, char *[]);
82 #if !defined(__minix)
83 static int rpc(int, char *[]);
84 #endif /* !defined(__minix) */
85 static int services(int, char *[]);
86 static int shells(int, char *[]);
87
88 enum {
89 RV_OK = 0,
90 RV_USAGE = 1,
91 RV_NOTFOUND = 2,
92 RV_NOENUM = 3
93 };
94
95 static struct getentdb {
96 const char *name;
97 int (*callback)(int, char *[]);
98 } databases[] = {
99 { "disktab", disktab, },
100 { "ethers", ethers, },
101 { "gettytab", gettytab, },
102 { "group", group, },
103 { "hosts", hosts, },
104 { "netgroup", netgroup, },
105 { "networks", networks, },
106 { "passwd", passwd, },
107 { "printcap", printcap, },
108 { "protocols", protocols, },
109 #if !defined(__minix)
110 { "rpc", rpc, },
111 #endif /* !defined(__minix) */
112 { "services", services, },
113 { "shells", shells, },
114
115 { NULL, NULL, },
116 };
117
118
119 int
main(int argc,char * argv[])120 main(int argc, char *argv[])
121 {
122 struct getentdb *curdb;
123
124 setprogname(argv[0]);
125
126 if (argc < 2)
127 usage();
128 for (curdb = databases; curdb->name != NULL; curdb++)
129 if (strcmp(curdb->name, argv[1]) == 0)
130 return (*curdb->callback)(argc, argv);
131
132 warn("Unknown database `%s'", argv[1]);
133 usage();
134 /* NOTREACHED */
135 }
136
137 static int
usage(void)138 usage(void)
139 {
140 struct getentdb *curdb;
141 size_t i;
142
143 (void)fprintf(stderr, "Usage: %s database [key ...]\n",
144 getprogname());
145 (void)fprintf(stderr, "\tdatabase may be one of:");
146 for (i = 0, curdb = databases; curdb->name != NULL; curdb++, i++) {
147 if (i % 7 == 0)
148 (void)fputs("\n\t\t", stderr);
149 (void)fprintf(stderr, "%s%s", i % 7 == 0 ? "" : " ",
150 curdb->name);
151 }
152 (void)fprintf(stderr, "\n");
153 exit(RV_USAGE);
154 /* NOTREACHED */
155 }
156
157 static int
parsenum(const char * word,unsigned long * result)158 parsenum(const char *word, unsigned long *result)
159 {
160 unsigned long num;
161 char *ep;
162
163 assert(word != NULL);
164 assert(result != NULL);
165
166 if (!isdigit((unsigned char)word[0]))
167 return 0;
168 errno = 0;
169 num = strtoul(word, &ep, 10);
170 if (num == ULONG_MAX && errno == ERANGE)
171 return 0;
172 if (*ep != '\0')
173 return 0;
174 *result = num;
175 return 1;
176 }
177
178 /*
179 * printfmtstrings --
180 * vprintf(format, ...),
181 * then the aliases (beginning with prefix, separated by sep),
182 * then a newline
183 */
184 static __printflike(4, 5) void
printfmtstrings(char * strings[],const char * prefix,const char * sep,const char * fmt,...)185 printfmtstrings(char *strings[], const char *prefix, const char *sep,
186 const char *fmt, ...)
187 {
188 va_list ap;
189 const char *curpref;
190 size_t i;
191
192 va_start(ap, fmt);
193 (void)vprintf(fmt, ap);
194 va_end(ap);
195
196 curpref = prefix;
197 for (i = 0; strings[i] != NULL; i++) {
198 (void)printf("%s%s", curpref, strings[i]);
199 curpref = sep;
200 }
201 (void)printf("\n");
202 }
203
204
205 /*
206 * ethers
207 */
208
209 static int
ethers(int argc,char * argv[])210 ethers(int argc, char *argv[])
211 {
212 char hostname[MAXHOSTNAMELEN + 1], *hp;
213 struct ether_addr ea, *eap;
214 int i, rv;
215
216 assert(argc > 1);
217 assert(argv != NULL);
218
219 #define ETHERSPRINT (void)printf("%-17s %s\n", ether_ntoa(eap), hp)
220
221 rv = RV_OK;
222 if (argc == 2) {
223 warnx("Enumeration not supported on ethers");
224 rv = RV_NOENUM;
225 } else {
226 for (i = 2; i < argc; i++) {
227 if ((eap = ether_aton(argv[i])) == NULL) {
228 eap = &ea;
229 hp = argv[i];
230 if (ether_hostton(hp, eap) != 0) {
231 rv = RV_NOTFOUND;
232 break;
233 }
234 } else {
235 hp = hostname;
236 if (ether_ntohost(hp, eap) != 0) {
237 rv = RV_NOTFOUND;
238 break;
239 }
240 }
241 ETHERSPRINT;
242 }
243 }
244 return rv;
245 }
246
247 /*
248 * group
249 */
250
251 static int
group(int argc,char * argv[])252 group(int argc, char *argv[])
253 {
254 struct group *gr;
255 unsigned long id;
256 int i, rv;
257
258 assert(argc > 1);
259 assert(argv != NULL);
260
261 #define GROUPPRINT printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
262 gr->gr_name, gr->gr_passwd, gr->gr_gid)
263
264 (void)setgroupent(1);
265 rv = RV_OK;
266 if (argc == 2) {
267 while ((gr = getgrent()) != NULL)
268 GROUPPRINT;
269 } else {
270 for (i = 2; i < argc; i++) {
271 if (parsenum(argv[i], &id))
272 gr = getgrgid((gid_t)id);
273 else
274 gr = getgrnam(argv[i]);
275 if (gr != NULL)
276 GROUPPRINT;
277 else {
278 rv = RV_NOTFOUND;
279 break;
280 }
281 }
282 }
283 endgrent();
284 return rv;
285 }
286
287
288 /*
289 * hosts
290 */
291
292 static void
hostsprint(const struct hostent * he)293 hostsprint(const struct hostent *he)
294 {
295 char buf[INET6_ADDRSTRLEN];
296
297 assert(he != NULL);
298 if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
299 (void)strlcpy(buf, "# unknown", sizeof(buf));
300 printfmtstrings(he->h_aliases, " ", " ", "%-16s %s", buf, he->h_name);
301 }
302
303 static int
hosts(int argc,char * argv[])304 hosts(int argc, char *argv[])
305 {
306 struct hostent *he;
307 char addr[IN6ADDRSZ];
308 int i, rv;
309
310 assert(argc > 1);
311 assert(argv != NULL);
312
313 sethostent(1);
314 rv = RV_OK;
315 if (argc == 2) {
316 while ((he = gethostent()) != NULL)
317 hostsprint(he);
318 } else {
319 for (i = 2; i < argc; i++) {
320 if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0)
321 he = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
322 else if (inet_pton(AF_INET, argv[i], (void *)addr) > 0)
323 he = gethostbyaddr(addr, INADDRSZ, AF_INET);
324 else
325 he = gethostbyname(argv[i]);
326 if (he != NULL)
327 hostsprint(he);
328 else {
329 rv = RV_NOTFOUND;
330 break;
331 }
332 }
333 }
334 endhostent();
335 return rv;
336 }
337
338 /*
339 * netgroup
340 */
341 static int
netgroup(int argc,char * argv[])342 netgroup(int argc, char *argv[])
343 {
344 int rv, i;
345 bool first;
346 const char *host, *user, *domain;
347
348 assert(argc > 1);
349 assert(argv != NULL);
350
351 #define NETGROUPPRINT(s) (((s) != NULL) ? (s) : "")
352
353 rv = RV_OK;
354 if (argc == 2) {
355 warnx("Enumeration not supported on netgroup");
356 rv = RV_NOENUM;
357 } else {
358 for (i = 2; i < argc; i++) {
359 setnetgrent(argv[i]);
360 first = true;
361 while (getnetgrent(&host, &user, &domain) != 0) {
362 if (first) {
363 first = false;
364 (void)fputs(argv[i], stdout);
365 }
366 (void)printf(" (%s,%s,%s)",
367 NETGROUPPRINT(host),
368 NETGROUPPRINT(user),
369 NETGROUPPRINT(domain));
370 }
371 if (!first)
372 (void)putchar('\n');
373 endnetgrent();
374 }
375 }
376
377 return rv;
378 }
379
380 /*
381 * networks
382 */
383
384 static void
networksprint(const struct netent * ne)385 networksprint(const struct netent *ne)
386 {
387 char buf[INET6_ADDRSTRLEN];
388 struct in_addr ianet;
389
390 assert(ne != NULL);
391 ianet = inet_makeaddr(ne->n_net, 0);
392 if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
393 (void)strlcpy(buf, "# unknown", sizeof(buf));
394 printfmtstrings(ne->n_aliases, " ", " ", "%-16s %s", ne->n_name, buf);
395 }
396
397 static int
networks(int argc,char * argv[])398 networks(int argc, char *argv[])
399 {
400 struct netent *ne;
401 in_addr_t net;
402 int i, rv;
403
404 assert(argc > 1);
405 assert(argv != NULL);
406
407 setnetent(1);
408 rv = RV_OK;
409 if (argc == 2) {
410 while ((ne = getnetent()) != NULL)
411 networksprint(ne);
412 } else {
413 for (i = 2; i < argc; i++) {
414 net = inet_network(argv[i]);
415 if (net != INADDR_NONE)
416 ne = getnetbyaddr(net, AF_INET);
417 else
418 ne = getnetbyname(argv[i]);
419 if (ne != NULL)
420 networksprint(ne);
421 else {
422 rv = RV_NOTFOUND;
423 break;
424 }
425 }
426 }
427 endnetent();
428 return rv;
429 }
430
431
432 /*
433 * passwd
434 */
435
436 static int
passwd(int argc,char * argv[])437 passwd(int argc, char *argv[])
438 {
439 struct passwd *pw;
440 unsigned long id;
441 int i, rv;
442
443 assert(argc > 1);
444 assert(argv != NULL);
445
446 #define PASSWDPRINT (void)printf("%s:%s:%u:%u:%s:%s:%s\n", \
447 pw->pw_name, pw->pw_passwd, pw->pw_uid, \
448 pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
449
450 (void)setpassent(1);
451 rv = RV_OK;
452 if (argc == 2) {
453 while ((pw = getpwent()) != NULL)
454 PASSWDPRINT;
455 } else {
456 for (i = 2; i < argc; i++) {
457 if (parsenum(argv[i], &id))
458 pw = getpwuid((uid_t)id);
459 else
460 pw = getpwnam(argv[i]);
461 if (pw != NULL)
462 PASSWDPRINT;
463 else {
464 rv = RV_NOTFOUND;
465 break;
466 }
467 }
468 }
469 endpwent();
470 return rv;
471 }
472
473 static char *
mygetent(const char * const * db_array,const char * name)474 mygetent(const char * const * db_array, const char *name)
475 {
476 char *buf = NULL;
477 int error;
478
479 switch (error = cgetent(&buf, db_array, name)) {
480 case -3:
481 warnx("tc= loop in record `%s' in `%s'", name, db_array[0]);
482 break;
483 case -2:
484 warn("system error fetching record `%s' in `%s'", name,
485 db_array[0]);
486 break;
487 case -1:
488 case 0:
489 break;
490 case 1:
491 warnx("tc= reference not found in record for `%s' in `%s'",
492 name, db_array[0]);
493 break;
494 default:
495 warnx("unknown error %d in record `%s' in `%s'", error, name,
496 db_array[0]);
497 break;
498 }
499 return buf;
500 }
501
502 static char *
mygetone(const char * const * db_array,int first)503 mygetone(const char * const * db_array, int first)
504 {
505 char *buf = NULL;
506 int error;
507
508 switch (error = (first ? cgetfirst : cgetnext)(&buf, db_array)) {
509 case -2:
510 warnx("tc= loop in `%s'", db_array[0]);
511 break;
512 case -1:
513 warn("system error fetching record in `%s'", db_array[0]);
514 break;
515 case 0:
516 case 1:
517 break;
518 case 2:
519 warnx("tc= reference not found in `%s'", db_array[0]);
520 break;
521 default:
522 warnx("unknown error %d in `%s'", error, db_array[0]);
523 break;
524 }
525 return buf;
526 }
527
528 static void
capprint(const char * cap)529 capprint(const char *cap)
530 {
531 char *c = strchr(cap, ':');
532 if (c)
533 if (c == cap)
534 (void)printf("true\n");
535 else {
536 int l = (int)(c - cap);
537 (void)printf("%*.*s\n", l, l, cap);
538 }
539 else
540 (void)printf("%s\n", cap);
541 }
542
543 static void
prettyprint(char * b)544 prettyprint(char *b)
545 {
546 #define TERMWIDTH 65
547 int did = 0;
548 size_t len;
549 char *s, c;
550
551 for (;;) {
552 len = strlen(b);
553 if (len <= TERMWIDTH) {
554 done:
555 if (did)
556 printf("\t:");
557 printf("%s\n", b);
558 return;
559 }
560 for (s = b + TERMWIDTH; s > b && *s != ':'; s--)
561 continue;
562 if (*s++ != ':')
563 goto done;
564 c = *s;
565 *s = '\0';
566 if (did)
567 printf("\t:");
568 did++;
569 printf("%s\\\n", b);
570 *s = c;
571 b = s;
572 }
573 }
574
575 static void
handleone(const char * const * db_array,char * b,int recurse,int pretty,int level)576 handleone(const char * const *db_array, char *b, int recurse, int pretty,
577 int level)
578 {
579 char *tc;
580
581 if (level && pretty)
582 printf("\n");
583 if (pretty)
584 prettyprint(b);
585 else
586 printf("%s\n", b);
587 if (!recurse || cgetstr(b, "tc", &tc) <= 0)
588 return;
589
590 b = mygetent(db_array, tc);
591 free(tc);
592
593 if (b == NULL)
594 return;
595
596 handleone(db_array, b, recurse, pretty, ++level);
597 free(b);
598 }
599
600 static int
handlecap(const char * db,int argc,char * argv[])601 handlecap(const char *db, int argc, char *argv[])
602 {
603 static const char sfx[] = "=#:";
604 const char *db_array[] = { db, NULL };
605 char *b, *cap;
606 int i, rv, c;
607 size_t j;
608 int expand = 1, recurse = 0, pretty = 0;
609
610 assert(argc > 1);
611 assert(argv != NULL);
612
613 argc--;
614 argv++;
615 while ((c = getopt(argc, argv, "pnr")) != -1)
616 switch (c) {
617 case 'n':
618 expand = 0;
619 break;
620 case 'r':
621 expand = 0;
622 recurse = 1;
623 break;
624 case 'p':
625 pretty = 1;
626 break;
627 default:
628 usage();
629 break;
630 }
631
632 argc -= optind;
633 argv += optind;
634 csetexpandtc(expand);
635 rv = RV_OK;
636 if (argc == 0) {
637 for (b = mygetone(db_array, 1); b; b = mygetone(db_array, 0)) {
638 handleone(db_array, b, recurse, pretty, 0);
639 free(b);
640 }
641 } else {
642 if ((b = mygetent(db_array, argv[0])) == NULL)
643 return RV_NOTFOUND;
644 if (argc == 1)
645 handleone(db_array, b, recurse, pretty, 0);
646 else {
647 for (i = 2; i < argc; i++) {
648 for (j = 0; j < sizeof(sfx) - 1; j++) {
649 cap = cgetcap(b, argv[i], sfx[j]);
650 if (cap) {
651 capprint(cap);
652 break;
653 }
654 }
655 if (j == sizeof(sfx) - 1)
656 printf("false\n");
657 }
658 }
659 free(b);
660 }
661 return rv;
662 }
663
664 /*
665 * gettytab
666 */
667
668 static int
gettytab(int argc,char * argv[])669 gettytab(int argc, char *argv[])
670 {
671 return handlecap(_PATH_GETTYTAB, argc, argv);
672 }
673
674 /*
675 * printcap
676 */
677
678 static int
printcap(int argc,char * argv[])679 printcap(int argc, char *argv[])
680 {
681 return handlecap(_PATH_PRINTCAP, argc, argv);
682 }
683
684 /*
685 * disktab
686 */
687
688 static int
disktab(int argc,char * argv[])689 disktab(int argc, char *argv[])
690 {
691 return handlecap(_PATH_DISKTAB, argc, argv);
692 }
693
694 /*
695 * protocols
696 */
697
698 static int
protocols(int argc,char * argv[])699 protocols(int argc, char *argv[])
700 {
701 struct protoent *pe;
702 unsigned long id;
703 int i, rv;
704
705 assert(argc > 1);
706 assert(argv != NULL);
707
708 #define PROTOCOLSPRINT printfmtstrings(pe->p_aliases, " ", " ", \
709 "%-16s %5d", pe->p_name, pe->p_proto)
710
711 setprotoent(1);
712 rv = RV_OK;
713 if (argc == 2) {
714 while ((pe = getprotoent()) != NULL)
715 PROTOCOLSPRINT;
716 } else {
717 for (i = 2; i < argc; i++) {
718 if (parsenum(argv[i], &id))
719 pe = getprotobynumber((int)id);
720 else
721 pe = getprotobyname(argv[i]);
722 if (pe != NULL)
723 PROTOCOLSPRINT;
724 else {
725 rv = RV_NOTFOUND;
726 break;
727 }
728 }
729 }
730 endprotoent();
731 return rv;
732 }
733
734 #if !defined(__minix)
735 /*
736 * rpc
737 */
738
739 static int
rpc(int argc,char * argv[])740 rpc(int argc, char *argv[])
741 {
742 struct rpcent *re;
743 unsigned long id;
744 int i, rv;
745
746 assert(argc > 1);
747 assert(argv != NULL);
748
749 #define RPCPRINT printfmtstrings(re->r_aliases, " ", " ", \
750 "%-16s %6d", \
751 re->r_name, re->r_number)
752
753 setrpcent(1);
754 rv = RV_OK;
755 if (argc == 2) {
756 while ((re = getrpcent()) != NULL)
757 RPCPRINT;
758 } else {
759 for (i = 2; i < argc; i++) {
760 if (parsenum(argv[i], &id))
761 re = getrpcbynumber((int)id);
762 else
763 re = getrpcbyname(argv[i]);
764 if (re != NULL)
765 RPCPRINT;
766 else {
767 rv = RV_NOTFOUND;
768 break;
769 }
770 }
771 }
772 endrpcent();
773 return rv;
774 }
775 #endif /* !defined(__minix) */
776
777 /*
778 * services
779 */
780
781 static int
services(int argc,char * argv[])782 services(int argc, char *argv[])
783 {
784 struct servent *se;
785 unsigned long id;
786 char *proto;
787 int i, rv;
788
789 assert(argc > 1);
790 assert(argv != NULL);
791
792 #define SERVICESPRINT printfmtstrings(se->s_aliases, " ", " ", \
793 "%-16s %5d/%s", \
794 se->s_name, ntohs(se->s_port), se->s_proto)
795
796 setservent(1);
797 rv = RV_OK;
798 if (argc == 2) {
799 while ((se = getservent()) != NULL)
800 SERVICESPRINT;
801 } else {
802 for (i = 2; i < argc; i++) {
803 proto = strchr(argv[i], '/');
804 if (proto != NULL)
805 *proto++ = '\0';
806 if (parsenum(argv[i], &id))
807 se = getservbyport(htons(id), proto);
808 else
809 se = getservbyname(argv[i], proto);
810 if (se != NULL)
811 SERVICESPRINT;
812 else {
813 rv = RV_NOTFOUND;
814 break;
815 }
816 }
817 }
818 endservent();
819 return rv;
820 }
821
822
823 /*
824 * shells
825 */
826
827 static int
shells(int argc,char * argv[])828 shells(int argc, char *argv[])
829 {
830 const char *sh;
831 int i, rv;
832
833 assert(argc > 1);
834 assert(argv != NULL);
835
836 #define SHELLSPRINT (void)printf("%s\n", sh)
837
838 setusershell();
839 rv = RV_OK;
840 if (argc == 2) {
841 while ((sh = getusershell()) != NULL)
842 SHELLSPRINT;
843 } else {
844 for (i = 2; i < argc; i++) {
845 setusershell();
846 while ((sh = getusershell()) != NULL) {
847 if (strcmp(sh, argv[i]) == 0) {
848 SHELLSPRINT;
849 break;
850 }
851 }
852 if (sh == NULL) {
853 rv = RV_NOTFOUND;
854 break;
855 }
856 }
857 }
858 endusershell();
859 return rv;
860 }
861