xref: /freebsd/usr.bin/getent/getent.c (revision 724b4bfdf1306e4f2c451b6d146fe0fe0353b2c8) 
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	*he4, *he6;
281 	char		addr[IN6ADDRSZ];
282 	int		i, rv;
283 
284 	assert(argc > 1);
285 	assert(argv != NULL);
286 
287 	sethostent(1);
288 	he4 = he6 = NULL;
289 	rv = RV_OK;
290 	if (argc == 2) {
291 		while ((he4 = gethostent()) != NULL)
292 			hostsprint(he4);
293 	} else {
294 		for (i = 2; i < argc; i++) {
295 			if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0) {
296 				he6 = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
297 				if (he6 != NULL)
298 					hostsprint(he6);
299 			} else if (inet_pton(AF_INET, argv[i],
300 			    (void *)addr) > 0) {
301 				he4 = gethostbyaddr(addr, INADDRSZ, AF_INET);
302 				if (he4 != NULL)
303 					hostsprint(he4);
304 	       		} else {
305 				he6 = gethostbyname2(argv[i], AF_INET6);
306 				if (he6 != NULL)
307 					hostsprint(he6);
308 				he4 = gethostbyname(argv[i]);
309 				if (he4 != NULL)
310 					hostsprint(he4);
311 			}
312 			if ( he4 == NULL && he6 == NULL ) {
313 				rv = RV_NOTFOUND;
314 				break;
315 			}
316 		}
317 	}
318 	endhostent();
319 	return rv;
320 }
321 
322 /*
323  * networks
324  */
325 static void
326 networksprint(const struct netent *ne)
327 {
328 	char		buf[INET6_ADDRSTRLEN];
329 	struct	in_addr	ianet;
330 
331 	assert(ne != NULL);
332 	ianet = inet_makeaddr(ne->n_net, 0);
333 	if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
334 		strlcpy(buf, "# unknown", sizeof(buf));
335 	printfmtstrings(ne->n_aliases, "  ", " ", "%-16s  %s", ne->n_name, buf);
336 }
337 
338 static int
339 networks(int argc, char *argv[])
340 {
341 	struct netent	*ne;
342 	in_addr_t	net;
343 	int		i, rv;
344 
345 	assert(argc > 1);
346 	assert(argv != NULL);
347 
348 	setnetent(1);
349 	rv = RV_OK;
350 	if (argc == 2) {
351 		while ((ne = getnetent()) != NULL)
352 			networksprint(ne);
353 	} else {
354 		for (i = 2; i < argc; i++) {
355 			net = inet_network(argv[i]);
356 			if (net != INADDR_NONE)
357 				ne = getnetbyaddr(net, AF_INET);
358 			else
359 				ne = getnetbyname(argv[i]);
360 			if (ne != NULL)
361 				networksprint(ne);
362 			else {
363 				rv = RV_NOTFOUND;
364 				break;
365 			}
366 		}
367 	}
368 	endnetent();
369 	return rv;
370 }
371 
372 /*
373  * passwd
374  */
375 static int
376 passwd(int argc, char *argv[])
377 {
378 	struct passwd	*pw;
379 	unsigned long	id;
380 	int		i, rv;
381 
382 	assert(argc > 1);
383 	assert(argv != NULL);
384 
385 #define PASSWDPRINT	printf("%s:%s:%u:%u:%s:%s:%s\n", \
386 			    pw->pw_name, pw->pw_passwd, pw->pw_uid, \
387 			    pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
388 
389 	setpassent(1);
390 	rv = RV_OK;
391 	if (argc == 2) {
392 		while ((pw = getpwent()) != NULL)
393 			PASSWDPRINT;
394 	} else {
395 		for (i = 2; i < argc; i++) {
396 			if (parsenum(argv[i], &id))
397 				pw = getpwuid((uid_t)id);
398 			else
399 				pw = getpwnam(argv[i]);
400 			if (pw != NULL)
401 				PASSWDPRINT;
402 			else {
403 				rv = RV_NOTFOUND;
404 				break;
405 			}
406 		}
407 	}
408 	endpwent();
409 	return rv;
410 }
411 
412 /*
413  * protocols
414  */
415 static int
416 protocols(int argc, char *argv[])
417 {
418 	struct protoent	*pe;
419 	unsigned long	id;
420 	int		i, rv;
421 
422 	assert(argc > 1);
423 	assert(argv != NULL);
424 
425 #define PROTOCOLSPRINT	printfmtstrings(pe->p_aliases, "  ", " ", \
426 			    "%-16s  %5d", pe->p_name, pe->p_proto)
427 
428 	setprotoent(1);
429 	rv = RV_OK;
430 	if (argc == 2) {
431 		while ((pe = getprotoent()) != NULL)
432 			PROTOCOLSPRINT;
433 	} else {
434 		for (i = 2; i < argc; i++) {
435 			if (parsenum(argv[i], &id))
436 				pe = getprotobynumber((int)id);
437 			else
438 				pe = getprotobyname(argv[i]);
439 			if (pe != NULL)
440 				PROTOCOLSPRINT;
441 			else {
442 				rv = RV_NOTFOUND;
443 				break;
444 			}
445 		}
446 	}
447 	endprotoent();
448 	return rv;
449 }
450 
451 /*
452  * rpc
453  */
454 static int
455 rpc(int argc, char *argv[])
456 {
457 	struct rpcent	*re;
458 	unsigned long	id;
459 	int		i, rv;
460 
461 	assert(argc > 1);
462 	assert(argv != NULL);
463 
464 #define RPCPRINT	printfmtstrings(re->r_aliases, "  ", " ", \
465 				"%-16s  %6d", \
466 				re->r_name, re->r_number)
467 
468 	setrpcent(1);
469 	rv = RV_OK;
470 	if (argc == 2) {
471 		while ((re = getrpcent()) != NULL)
472 			RPCPRINT;
473 	} else {
474 		for (i = 2; i < argc; i++) {
475 			if (parsenum(argv[i], &id))
476 				re = getrpcbynumber((int)id);
477 			else
478 				re = getrpcbyname(argv[i]);
479 			if (re != NULL)
480 				RPCPRINT;
481 			else {
482 				rv = RV_NOTFOUND;
483 				break;
484 			}
485 		}
486 	}
487 	endrpcent();
488 	return rv;
489 }
490 
491 /*
492  * services
493  */
494 static int
495 services(int argc, char *argv[])
496 {
497 	struct servent	*se;
498 	unsigned long	id;
499 	char		*proto;
500 	int		i, rv;
501 
502 	assert(argc > 1);
503 	assert(argv != NULL);
504 
505 #define SERVICESPRINT	printfmtstrings(se->s_aliases, "  ", " ", \
506 			    "%-16s  %5d/%s", \
507 			    se->s_name, ntohs(se->s_port), se->s_proto)
508 
509 	setservent(1);
510 	rv = RV_OK;
511 	if (argc == 2) {
512 		while ((se = getservent()) != NULL)
513 			SERVICESPRINT;
514 	} else {
515 		for (i = 2; i < argc; i++) {
516 			proto = strchr(argv[i], '/');
517 			if (proto != NULL)
518 				*proto++ = '\0';
519 			if (parsenum(argv[i], &id))
520 				se = getservbyport(htons((u_short)id), proto);
521 			else
522 				se = getservbyname(argv[i], proto);
523 			if (se != NULL)
524 				SERVICESPRINT;
525 			else {
526 				rv = RV_NOTFOUND;
527 				break;
528 			}
529 		}
530 	}
531 	endservent();
532 	return rv;
533 }
534 
535 /*
536  * shells
537  */
538 static int
539 shells(int argc, char *argv[])
540 {
541 	const char	*sh;
542 	int		i, rv;
543 
544 	assert(argc > 1);
545 	assert(argv != NULL);
546 
547 #define SHELLSPRINT	printf("%s\n", sh)
548 
549 	setusershell();
550 	rv = RV_OK;
551 	if (argc == 2) {
552 		while ((sh = getusershell()) != NULL)
553 			SHELLSPRINT;
554 	} else {
555 		for (i = 2; i < argc; i++) {
556 			setusershell();
557 			while ((sh = getusershell()) != NULL) {
558 				if (strcmp(sh, argv[i]) == 0) {
559 					SHELLSPRINT;
560 					break;
561 				}
562 			}
563 			if (sh == NULL) {
564 				rv = RV_NOTFOUND;
565 				break;
566 			}
567 		}
568 	}
569 	endusershell();
570 	return rv;
571 }
572 
573 /*
574  * utmpx
575  */
576 
577 #define	UTMPXPRINTID do {			\
578 	size_t i;				\
579 	for (i = 0; i < sizeof ut->ut_id; i++)	\
580 		printf("%02hhx", ut->ut_id[i]);	\
581 } while (0)
582 
583 static void
584 utmpxprint(const struct utmpx *ut)
585 {
586 
587 	if (ut->ut_type == EMPTY)
588 		return;
589 
590 	printf("[%jd.%06u -- %.24s] ",
591 	    (intmax_t)ut->ut_tv.tv_sec, (unsigned int)ut->ut_tv.tv_usec,
592 	    ctime(&ut->ut_tv.tv_sec));
593 
594 	switch (ut->ut_type) {
595 	case BOOT_TIME:
596 		printf("system boot\n");
597 		return;
598 	case SHUTDOWN_TIME:
599 		printf("system shutdown\n");
600 		return;
601 	case OLD_TIME:
602 		printf("old system time\n");
603 		return;
604 	case NEW_TIME:
605 		printf("new system time\n");
606 		return;
607 	case USER_PROCESS:
608 		printf("user process: id=\"");
609 		UTMPXPRINTID;
610 		printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
611 		    ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
612 		break;
613 	case INIT_PROCESS:
614 		printf("init process: id=\"");
615 		UTMPXPRINTID;
616 		printf("\" pid=\"%d\"\n", ut->ut_pid);
617 		break;
618 	case LOGIN_PROCESS:
619 		printf("login process: id=\"");
620 		UTMPXPRINTID;
621 		printf("\" pid=\"%d\" user=\"%s\" line=\"%s\" host=\"%s\"\n",
622 		    ut->ut_pid, ut->ut_user, ut->ut_line, ut->ut_host);
623 		break;
624 	case DEAD_PROCESS:
625 		printf("dead process: id=\"");
626 		UTMPXPRINTID;
627 		printf("\" pid=\"%d\"\n", ut->ut_pid);
628 		break;
629 	default:
630 		printf("unknown record type %hu\n", ut->ut_type);
631 		break;
632 	}
633 }
634 
635 static int
636 utmpx(int argc, char *argv[])
637 {
638 	const struct utmpx *ut;
639 	const char *file = NULL;
640 	int rv = RV_OK, db = 0;
641 
642 	assert(argc > 1);
643 	assert(argv != NULL);
644 
645 	if (argc == 3 || argc == 4) {
646 		if (strcmp(argv[2], "active") == 0)
647 			db = UTXDB_ACTIVE;
648 		else if (strcmp(argv[2], "lastlogin") == 0)
649 			db = UTXDB_LASTLOGIN;
650 		else if (strcmp(argv[2], "log") == 0)
651 			db = UTXDB_LOG;
652 		else
653 			rv = RV_USAGE;
654 		if (argc == 4)
655 			file = argv[3];
656 	} else {
657 		rv = RV_USAGE;
658 	}
659 
660 	if (rv == RV_USAGE) {
661 		fprintf(stderr,
662 		    "Usage: %s utmpx active | lastlogin | log [filename]\n",
663 		    getprogname());
664 	} else if (rv == RV_OK) {
665 		if (setutxdb(db, file) != 0)
666 			return (RV_NOTFOUND);
667 		while ((ut = getutxent()) != NULL)
668 			utmpxprint(ut);
669 		endutxent();
670 	}
671 	return (rv);
672 }
673