xref: /freebsd/usr.bin/getent/getent.c (revision 8ddb146abcdf061be9f2c0db7e391697dafad85c) 
1 /*	$NetBSD: getent.c,v 1.7 2005/08/24 14:31:02 ginsbach Exp $	*/
2 
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
5  *
6  * Copyright (c) 2004 The NetBSD Foundation, Inc.
7  * All rights reserved.
8  *
9  * This code is derived from software contributed to The NetBSD Foundation
10  * by Luke Mewburn.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36 
37 #include <sys/socket.h>
38 #include <sys/param.h>
39 #include <arpa/inet.h>
40 #include <arpa/nameser.h>
41 #include <net/if.h>
42 #include <netinet/if_ether.h>
43 #include <netinet/in.h>		/* for INET6_ADDRSTRLEN */
44 #include <rpc/rpcent.h>
45 
46 #include <assert.h>
47 #include <ctype.h>
48 #include <errno.h>
49 #include <grp.h>
50 #include <limits.h>
51 #include <netdb.h>
52 #include <pwd.h>
53 #include <stdarg.h>
54 #include <stdint.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59 #include <utmpx.h>
60 
61 static int	usage(void);
62 static int	parsenum(const char *, unsigned long *);
63 static int	ethers(int, char *[]);
64 static int	group(int, char *[]);
65 static int	hosts(int, char *[]);
66 static int	netgroup(int, char *[]);
67 static int	networks(int, char *[]);
68 static int	passwd(int, char *[]);
69 static int	protocols(int, char *[]);
70 static int	rpc(int, char *[]);
71 static int	services(int, char *[]);
72 static int	shells(int, char *[]);
73 static int	utmpx(int, char *[]);
74 
75 enum {
76 	RV_OK		= 0,
77 	RV_USAGE	= 1,
78 	RV_NOTFOUND	= 2,
79 	RV_NOENUM	= 3
80 };
81 
82 static struct getentdb {
83 	const char	*name;
84 	int		(*callback)(int, char *[]);
85 } databases[] = {
86 	{	"ethers",	ethers,		},
87 	{	"group",	group,		},
88 	{	"hosts",	hosts,		},
89 	{	"netgroup",	netgroup,	},
90 	{	"networks",	networks,	},
91 	{	"passwd",	passwd,		},
92 	{	"protocols",	protocols,	},
93 	{	"rpc",		rpc,		},
94 	{	"services",	services,	},
95 	{	"shells",	shells,		},
96 	{	"utmpx",	utmpx,		},
97 
98 	{	NULL,		NULL,		},
99 };
100 
101 int
102 main(int argc, char *argv[])
103 {
104 	struct getentdb	*curdb;
105 
106 	setprogname(argv[0]);
107 
108 	if (argc < 2)
109 		usage();
110 	for (curdb = databases; curdb->name != NULL; curdb++) {
111 		if (strcmp(curdb->name, argv[1]) == 0) {
112 			exit(curdb->callback(argc, argv));
113 		}
114 	}
115 	fprintf(stderr, "Unknown database: %s\n", argv[1]);
116 	usage();
117 	/* NOTREACHED */
118 	return RV_USAGE;
119 }
120 
121 static int
122 usage(void)
123 {
124 	struct getentdb	*curdb;
125 
126 	fprintf(stderr, "Usage: %s database [key ...]\n",
127 	    getprogname());
128 	fprintf(stderr, "       database may be one of:\n\t");
129 	for (curdb = databases; curdb->name != NULL; curdb++) {
130 		fprintf(stderr, " %s", curdb->name);
131 	}
132 	fprintf(stderr, "\n");
133 	exit(RV_USAGE);
134 	/* NOTREACHED */
135 }
136 
137 static int
138 parsenum(const char *word, unsigned long *result)
139 {
140 	unsigned long	num;
141 	char		*ep;
142 
143 	assert(word != NULL);
144 	assert(result != NULL);
145 
146 	if (!isdigit((unsigned char)word[0]))
147 		return 0;
148 	errno = 0;
149 	num = strtoul(word, &ep, 10);
150 	if (num == ULONG_MAX && errno == ERANGE)
151 		return 0;
152 	if (*ep != '\0')
153 		return 0;
154 	*result = num;
155 	return 1;
156 }
157 
158 /*
159  * printfmtstrings --
160  *	vprintf(format, ...),
161  *	then the aliases (beginning with prefix, separated by sep),
162  *	then a newline
163  */
164 static void
165 printfmtstrings(char *strings[], const char *prefix, const char *sep,
166 	const char *fmt, ...)
167 {
168 	va_list		ap;
169 	const char	*curpref;
170 	int		i;
171 
172 	va_start(ap, fmt);
173 	vprintf(fmt, ap);
174 
175 	curpref = prefix;
176 	for (i = 0; strings[i] != NULL; i++) {
177 		printf("%s%s", curpref, strings[i]);
178 		curpref = sep;
179 	}
180 	printf("\n");
181 	va_end(ap);
182 }
183 
184 /*
185  * ethers
186  */
187 static int
188 ethers(int argc, char *argv[])
189 {
190 	char		hostname[MAXHOSTNAMELEN + 1], *hp;
191 	struct ether_addr ea, *eap;
192 	int		i, rv;
193 
194 	assert(argc > 1);
195 	assert(argv != NULL);
196 
197 #define ETHERSPRINT	printf("%-17s  %s\n", ether_ntoa(eap), hp)
198 
199 	rv = RV_OK;
200 	if (argc == 2) {
201 		fprintf(stderr, "Enumeration not supported on ethers\n");
202 		rv = RV_NOENUM;
203 	} else {
204 		for (i = 2; i < argc; i++) {
205 			if ((eap = ether_aton(argv[i])) == NULL) {
206 				eap = &ea;
207 				hp = argv[i];
208 				if (ether_hostton(hp, eap) != 0) {
209 					rv = RV_NOTFOUND;
210 					break;
211 				}
212 			} else {
213 				hp = hostname;
214 				if (ether_ntohost(hp, eap) != 0) {
215 					rv = RV_NOTFOUND;
216 					break;
217 				}
218 			}
219 			ETHERSPRINT;
220 		}
221 	}
222 	return rv;
223 }
224 
225 /*
226  * group
227  */
228 
229 static int
230 group(int argc, char *argv[])
231 {
232 	struct group	*gr;
233 	unsigned long	id;
234 	int		i, rv;
235 
236 	assert(argc > 1);
237 	assert(argv != NULL);
238 
239 #define GROUPPRINT	printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
240 			    gr->gr_name, gr->gr_passwd, gr->gr_gid)
241 
242 	setgroupent(1);
243 	rv = RV_OK;
244 	if (argc == 2) {
245 		while ((gr = getgrent()) != NULL)
246 			GROUPPRINT;
247 	} else {
248 		for (i = 2; i < argc; i++) {
249 			if (parsenum(argv[i], &id))
250 				gr = getgrgid((gid_t)id);
251 			else
252 				gr = getgrnam(argv[i]);
253 			if (gr != NULL)
254 				GROUPPRINT;
255 			else {
256 				rv = RV_NOTFOUND;
257 				break;
258 			}
259 		}
260 	}
261 	endgrent();
262 	return rv;
263 }
264 
265 
266 /*
267  * hosts
268  */
269 
270 static void
271 hostsprint(const struct hostent *he)
272 {
273 	char	buf[INET6_ADDRSTRLEN];
274 
275 	assert(he != NULL);
276 	if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
277 		strlcpy(buf, "# unknown", sizeof(buf));
278 	printfmtstrings(he->h_aliases, "  ", " ", "%-16s  %s", buf, he->h_name);
279 }
280 
281 static int
282 hosts(int argc, char *argv[])
283 {
284 	struct hostent	*he4, *he6;
285 	char		addr[IN6ADDRSZ];
286 	int		i, rv;
287 
288 	assert(argc > 1);
289 	assert(argv != NULL);
290 
291 	sethostent(1);
292 	he4 = he6 = NULL;
293 	rv = RV_OK;
294 	if (argc == 2) {
295 		while ((he4 = gethostent()) != NULL)
296 			hostsprint(he4);
297 	} else {
298 		for (i = 2; i < argc; i++) {
299 			if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0) {
300 				he6 = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
301 				if (he6 != NULL)
302 					hostsprint(he6);
303 			} else if (inet_pton(AF_INET, argv[i],
304 			    (void *)addr) > 0) {
305 				he4 = gethostbyaddr(addr, INADDRSZ, AF_INET);
306 				if (he4 != NULL)
307 					hostsprint(he4);
308 	       		} else {
309 				he6 = gethostbyname2(argv[i], AF_INET6);
310 				if (he6 != NULL)
311 					hostsprint(he6);
312 				he4 = gethostbyname(argv[i]);
313 				if (he4 != NULL)
314 					hostsprint(he4);
315 			}
316 			if ( he4 == NULL && he6 == NULL ) {
317 				rv = RV_NOTFOUND;
318 				break;
319 			}
320 		}
321 	}
322 	endhostent();
323 	return rv;
324 }
325 
326 /*
327  * networks
328  */
329 static void
330 networksprint(const struct netent *ne)
331 {
332 	char		buf[INET6_ADDRSTRLEN];
333 	struct	in_addr	ianet;
334 
335 	assert(ne != NULL);
336 	ianet = inet_makeaddr(ne->n_net, 0);
337 	if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
338 		strlcpy(buf, "# unknown", sizeof(buf));
339 	printfmtstrings(ne->n_aliases, "  ", " ", "%-16s  %s", ne->n_name, buf);
340 }
341 
342 static int
343 networks(int argc, char *argv[])
344 {
345 	struct netent	*ne;
346 	in_addr_t	net;
347 	int		i, rv;
348 
349 	assert(argc > 1);
350 	assert(argv != NULL);
351 
352 	setnetent(1);
353 	rv = RV_OK;
354 	if (argc == 2) {
355 		while ((ne = getnetent()) != NULL)
356 			networksprint(ne);
357 	} else {
358 		for (i = 2; i < argc; i++) {
359 			net = inet_network(argv[i]);
360 			if (net != INADDR_NONE)
361 				ne = getnetbyaddr(net, AF_INET);
362 			else
363 				ne = getnetbyname(argv[i]);
364 			if (ne != NULL)
365 				networksprint(ne);
366 			else {
367 				rv = RV_NOTFOUND;
368 				break;
369 			}
370 		}
371 	}
372 	endnetent();
373 	return rv;
374 }
375 
376 /*
377  * passwd
378  */
379 static int
380 passwd(int argc, char *argv[])
381 {
382 	struct passwd	*pw;
383 	unsigned long	id;
384 	int		i, rv;
385 
386 	assert(argc > 1);
387 	assert(argv != NULL);
388 
389 #define PASSWDPRINT	printf("%s:%s:%u:%u:%s:%s:%s\n", \
390 			    pw->pw_name, pw->pw_passwd, pw->pw_uid, \
391 			    pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
392 
393 	setpassent(1);
394 	rv = RV_OK;
395 	if (argc == 2) {
396 		while ((pw = getpwent()) != NULL)
397 			PASSWDPRINT;
398 	} else {
399 		for (i = 2; i < argc; i++) {
400 			if (parsenum(argv[i], &id))
401 				pw = getpwuid((uid_t)id);
402 			else
403 				pw = getpwnam(argv[i]);
404 			if (pw != NULL)
405 				PASSWDPRINT;
406 			else {
407 				rv = RV_NOTFOUND;
408 				break;
409 			}
410 		}
411 	}
412 	endpwent();
413 	return rv;
414 }
415 
416 /*
417  * protocols
418  */
419 static int
420 protocols(int argc, char *argv[])
421 {
422 	struct protoent	*pe;
423 	unsigned long	id;
424 	int		i, rv;
425 
426 	assert(argc > 1);
427 	assert(argv != NULL);
428 
429 #define PROTOCOLSPRINT	printfmtstrings(pe->p_aliases, "  ", " ", \
430 			    "%-16s  %5d", pe->p_name, pe->p_proto)
431 
432 	setprotoent(1);
433 	rv = RV_OK;
434 	if (argc == 2) {
435 		while ((pe = getprotoent()) != NULL)
436 			PROTOCOLSPRINT;
437 	} else {
438 		for (i = 2; i < argc; i++) {
439 			if (parsenum(argv[i], &id))
440 				pe = getprotobynumber((int)id);
441 			else
442 				pe = getprotobyname(argv[i]);
443 			if (pe != NULL)
444 				PROTOCOLSPRINT;
445 			else {
446 				rv = RV_NOTFOUND;
447 				break;
448 			}
449 		}
450 	}
451 	endprotoent();
452 	return rv;
453 }
454 
455 /*
456  * rpc
457  */
458 static int
459 rpc(int argc, char *argv[])
460 {
461 	struct rpcent	*re;
462 	unsigned long	id;
463 	int		i, rv;
464 
465 	assert(argc > 1);
466 	assert(argv != NULL);
467 
468 #define RPCPRINT	printfmtstrings(re->r_aliases, "  ", " ", \
469 				"%-16s  %6d", \
470 				re->r_name, re->r_number)
471 
472 	setrpcent(1);
473 	rv = RV_OK;
474 	if (argc == 2) {
475 		while ((re = getrpcent()) != NULL)
476 			RPCPRINT;
477 	} else {
478 		for (i = 2; i < argc; i++) {
479 			if (parsenum(argv[i], &id))
480 				re = getrpcbynumber((int)id);
481 			else
482 				re = getrpcbyname(argv[i]);
483 			if (re != NULL)
484 				RPCPRINT;
485 			else {
486 				rv = RV_NOTFOUND;
487 				break;
488 			}
489 		}
490 	}
491 	endrpcent();
492 	return rv;
493 }
494 
495 /*
496  * services
497  */
498 static int
499 services(int argc, char *argv[])
500 {
501 	struct servent	*se;
502 	unsigned long	id;
503 	char		*proto;
504 	int		i, rv;
505 
506 	assert(argc > 1);
507 	assert(argv != NULL);
508 
509 #define SERVICESPRINT	printfmtstrings(se->s_aliases, "  ", " ", \
510 			    "%-16s  %5d/%s", \
511 			    se->s_name, ntohs(se->s_port), se->s_proto)
512 
513 	setservent(1);
514 	rv = RV_OK;
515 	if (argc == 2) {
516 		while ((se = getservent()) != NULL)
517 			SERVICESPRINT;
518 	} else {
519 		for (i = 2; i < argc; i++) {
520 			proto = strchr(argv[i], '/');
521 			if (proto != NULL)
522 				*proto++ = '\0';
523 			if (parsenum(argv[i], &id))
524 				se = getservbyport(htons((u_short)id), proto);
525 			else
526 				se = getservbyname(argv[i], proto);
527 			if (se != NULL)
528 				SERVICESPRINT;
529 			else {
530 				rv = RV_NOTFOUND;
531 				break;
532 			}
533 		}
534 	}
535 	endservent();
536 	return rv;
537 }
538 
539 /*
540  * shells
541  */
542 static int
543 shells(int argc, char *argv[])
544 {
545 	const char	*sh;
546 	int		i, rv;
547 
548 	assert(argc > 1);
549 	assert(argv != NULL);
550 
551 #define SHELLSPRINT	printf("%s\n", sh)
552 
553 	setusershell();
554 	rv = RV_OK;
555 	if (argc == 2) {
556 		while ((sh = getusershell()) != NULL)
557 			SHELLSPRINT;
558 	} else {
559 		for (i = 2; i < argc; i++) {
560 			setusershell();
561 			while ((sh = getusershell()) != NULL) {
562 				if (strcmp(sh, argv[i]) == 0) {
563 					SHELLSPRINT;
564 					break;
565 				}
566 			}
567 			if (sh == NULL) {
568 				rv = RV_NOTFOUND;
569 				break;
570 			}
571 		}
572 	}
573 	endusershell();
574 	return rv;
575 }
576 
577 /*
578  * netgroup
579  */
580 static int
581 netgroup(int argc, char *argv[])
582 {
583 	char		*host, *user, *domain;
584 	int		first;
585 	int		rv, i;
586 
587 	assert(argc > 1);
588 	assert(argv != NULL);
589 
590 #define NETGROUPPRINT(s)	(((s) != NULL) ? (s) : "")
591 
592 	rv = RV_OK;
593 	if (argc == 2) {
594 		fprintf(stderr, "Enumeration not supported on netgroup\n");
595 		rv = RV_NOENUM;
596 	} else {
597 		for (i = 2; i < argc; i++) {
598 			setnetgrent(argv[i]);
599 			first = 1;
600 			while (getnetgrent(&host, &user, &domain) != 0) {
601 				if (first) {
602 					first = 0;
603 					(void)fputs(argv[i], stdout);
604 				}
605 				(void)printf(" (%s,%s,%s)",
606 				    NETGROUPPRINT(host),
607 				    NETGROUPPRINT(user),
608 				    NETGROUPPRINT(domain));
609 			}
610 			if (!first)
611 				(void)putchar('\n');
612 			endnetgrent();
613 		}
614 	}
615 	return rv;
616 }
617 
618 /*
619  * utmpx
620  */
621 
622 #define	UTMPXPRINTID do {			\
623 	size_t i;				\
624 	for (i = 0; i < sizeof ut->ut_id; i++)	\
625 		printf("%02hhx", ut->ut_id[i]);	\
626 } while (0)
627 
628 static void
629 utmpxprint(const struct utmpx *ut)
630 {
631 
632 	if (ut->ut_type == EMPTY)
633 		return;
634 
635 	printf("[%jd.%06u -- %.24s] ",
636 	    (intmax_t)ut->ut_tv.tv_sec, (unsigned int)ut->ut_tv.tv_usec,
637 	    ctime(&ut->ut_tv.tv_sec));
638 
639 	switch (ut->ut_type) {
640 	case BOOT_TIME:
641 		printf("system boot\n");
642 		return;
643 	case SHUTDOWN_TIME:
644 		printf("system shutdown\n");
645 		return;
646 	case OLD_TIME:
647 		printf("old system time\n");
648 		return;
649 	case NEW_TIME:
650 		printf("new system time\n");
651 		return;
652 	case USER_PROCESS:
653 		printf("user process: id=\"");
654 		UTMPXPRINTID;
655 		printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
656 		    ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
657 		break;
658 	case INIT_PROCESS:
659 		printf("init process: id=\"");
660 		UTMPXPRINTID;
661 		printf("\" pid=\"%d\"\n", ut->ut_pid);
662 		break;
663 	case LOGIN_PROCESS:
664 		printf("login process: id=\"");
665 		UTMPXPRINTID;
666 		printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
667 		    ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
668 		break;
669 	case DEAD_PROCESS:
670 		printf("dead process: id=\"");
671 		UTMPXPRINTID;
672 		printf("\" pid=\"%d\"\n", ut->ut_pid);
673 		break;
674 	default:
675 		printf("unknown record type %hu\n", ut->ut_type);
676 		break;
677 	}
678 }
679 
680 static int
681 utmpx(int argc, char *argv[])
682 {
683 	const struct utmpx *ut;
684 	const char *file = NULL;
685 	int rv = RV_OK, db = 0;
686 
687 	assert(argc > 1);
688 	assert(argv != NULL);
689 
690 	if (argc == 3 || argc == 4) {
691 		if (strcmp(argv[2], "active") == 0)
692 			db = UTXDB_ACTIVE;
693 		else if (strcmp(argv[2], "lastlogin") == 0)
694 			db = UTXDB_LASTLOGIN;
695 		else if (strcmp(argv[2], "log") == 0)
696 			db = UTXDB_LOG;
697 		else
698 			rv = RV_USAGE;
699 		if (argc == 4)
700 			file = argv[3];
701 	} else {
702 		rv = RV_USAGE;
703 	}
704 
705 	if (rv == RV_USAGE) {
706 		fprintf(stderr,
707 		    "Usage: %s utmpx active | lastlogin | log [filename]\n",
708 		    getprogname());
709 	} else if (rv == RV_OK) {
710 		if (setutxdb(db, file) != 0)
711 			return (RV_NOTFOUND);
712 		while ((ut = getutxent()) != NULL)
713 			utmpxprint(ut);
714 		endutxent();
715 	}
716 	return (rv);
717 }
718