getent.c revision 1.5 1 /* $NetBSD: getent.c,v 1.5 2004/11/29 05:02:40 lukem 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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 #ifndef lint
41 __RCSID("$NetBSD: getent.c,v 1.5 2004/11/29 05:02:40 lukem Exp $");
42 #endif /* not lint */
43
44 #include <sys/socket.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 <stdio.h>
54 #include <stdarg.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58
59 #include <arpa/inet.h>
60 #include <arpa/nameser.h>
61
62 #include <netinet/in.h> /* for INET6_ADDRSTRLEN */
63
64 static int usage(void);
65 static int parsenum(const char *, unsigned long *);
66 static int group(int, char *[]);
67 static int hosts(int, char *[]);
68 static int networks(int, char *[]);
69 static int passwd(int, char *[]);
70 static int protocols(int, char *[]);
71 static int services(int, char *[]);
72 static int shells(int, char *[]);
73
74 enum {
75 RV_OK = 0,
76 RV_USAGE = 1,
77 RV_NOTFOUND = 2,
78 RV_NOENUM = 3,
79 };
80
81 static struct getentdb {
82 const char *name;
83 int (*callback)(int, char *[]);
84 } databases[] = {
85 { "group", group, },
86 { "hosts", hosts, },
87 { "networks", networks, },
88 { "passwd", passwd, },
89 { "protocols", protocols, },
90 { "services", services, },
91 { "shells", shells, },
92
93 { NULL, NULL, },
94 };
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 break;
110 }
111 }
112 fprintf(stderr, "Unknown database: %s\n", argv[1]);
113 usage();
114 /* NOTREACHED */
115 return RV_USAGE;
116 }
117
118 static int
119 usage(void)
120 {
121 struct getentdb *curdb;
122
123 fprintf(stderr, "Usage: %s database [key ...]\n",
124 getprogname());
125 fprintf(stderr, " database may be one of:\n\t");
126 for (curdb = databases; curdb->name != NULL; curdb++) {
127 fprintf(stderr, " %s", curdb->name);
128 }
129 fprintf(stderr, "\n");
130 exit(RV_USAGE);
131 /* NOTREACHED */
132 }
133
134 static int
135 parsenum(const char *word, unsigned long *result)
136 {
137 unsigned long num;
138 char *ep;
139
140 assert(word != NULL);
141 assert(result != NULL);
142
143 if (!isdigit((unsigned char)word[0]))
144 return 0;
145 errno = 0;
146 num = strtoul(word, &ep, 10);
147 if (num == ULONG_MAX && errno == ERANGE)
148 return 0;
149 if (*ep != '\0')
150 return 0;
151 *result = num;
152 return 1;
153 }
154
155 /*
156 * printfmtstrings --
157 * vprintf(format, ...),
158 * then the aliases (beginning with prefix, separated by sep),
159 * then a newline
160 */
161 static void
162 printfmtstrings(char *strings[], const char *prefix, const char *sep,
163 const char *fmt, ...)
164 {
165 va_list ap;
166 const char *curpref;
167 int i;
168
169 va_start(ap, fmt);
170 vprintf(fmt, ap);
171
172 curpref = prefix;
173 for (i = 0; strings[i] != NULL; i++) {
174 printf("%s%s", curpref, strings[i]);
175 curpref = sep;
176 }
177 printf("\n");
178 }
179
180
181 /*
182 * group
183 */
184
185 static int
186 group(int argc, char *argv[])
187 {
188 struct group *gr;
189 unsigned long id;
190 int i, rv;
191
192 assert(argc > 1);
193 assert(argv != NULL);
194
195 #define GROUPPRINT printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
196 gr->gr_name, gr->gr_passwd, gr->gr_gid)
197
198 setgroupent(1);
199 rv = RV_OK;
200 if (argc == 2) {
201 while ((gr = getgrent()) != NULL)
202 GROUPPRINT;
203 } else {
204 for (i = 2; i < argc; i++) {
205 if (parsenum(argv[i], &id))
206 gr = getgrgid((gid_t)id);
207 else
208 gr = getgrnam(argv[i]);
209 if (gr != NULL)
210 GROUPPRINT;
211 else {
212 rv = RV_NOTFOUND;
213 break;
214 }
215 }
216 }
217 endgrent();
218 return rv;
219 }
220
221
222 /*
223 * hosts
224 */
225
226 static void
227 hostsprint(const struct hostent *he)
228 {
229 char buf[INET6_ADDRSTRLEN];
230
231 assert(he != NULL);
232 if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
233 strlcpy(buf, "# unknown", sizeof(buf));
234 printfmtstrings(he->h_aliases, " ", " ", "%-16s %s", buf, he->h_name);
235 }
236
237 static int
238 hosts(int argc, char *argv[])
239 {
240 struct hostent *he;
241 char addr[IN6ADDRSZ];
242 int i, rv;
243
244 assert(argc > 1);
245 assert(argv != NULL);
246
247 sethostent(1);
248 rv = RV_OK;
249 if (argc == 2) {
250 while ((he = gethostent()) != NULL)
251 hostsprint(he);
252 } else {
253 for (i = 2; i < argc; i++) {
254 if (inet_pton(AF_INET6, argv[i], (void *)addr) > 0)
255 he = gethostbyaddr(addr, IN6ADDRSZ, AF_INET6);
256 else if (inet_pton(AF_INET, argv[i], (void *)addr) > 0)
257 he = gethostbyaddr(addr, INADDRSZ, AF_INET);
258 else
259 he = gethostbyname(argv[i]);
260 if (he != NULL)
261 hostsprint(he);
262 else {
263 rv = RV_NOTFOUND;
264 break;
265 }
266 }
267 }
268 endhostent();
269 return rv;
270 }
271
272
273 /*
274 * networks
275 */
276
277 static void
278 networksprint(const struct netent *ne)
279 {
280 char buf[INET6_ADDRSTRLEN];
281 struct in_addr ianet;
282
283 assert(ne != NULL);
284 ianet = inet_makeaddr(ne->n_net, 0);
285 if (inet_ntop(ne->n_addrtype, &ianet, buf, sizeof(buf)) == NULL)
286 strlcpy(buf, "# unknown", sizeof(buf));
287 printfmtstrings(ne->n_aliases, " ", " ", "%-16s %s", ne->n_name, buf);
288 }
289
290 static int
291 networks(int argc, char *argv[])
292 {
293 struct netent *ne;
294 in_addr_t net;
295 int i, rv;
296
297 assert(argc > 1);
298 assert(argv != NULL);
299
300 setnetent(1);
301 rv = RV_OK;
302 if (argc == 2) {
303 while ((ne = getnetent()) != NULL)
304 networksprint(ne);
305 } else {
306 for (i = 2; i < argc; i++) {
307 net = inet_network(argv[i]);
308 if (net != INADDR_NONE)
309 ne = getnetbyaddr(net, AF_INET);
310 else
311 ne = getnetbyname(argv[i]);
312 if (ne != NULL)
313 networksprint(ne);
314 else {
315 rv = RV_NOTFOUND;
316 break;
317 }
318 }
319 }
320 endnetent();
321 return rv;
322 }
323
324
325 /*
326 * passwd
327 */
328
329 static int
330 passwd(int argc, char *argv[])
331 {
332 struct passwd *pw;
333 unsigned long id;
334 int i, rv;
335
336 assert(argc > 1);
337 assert(argv != NULL);
338
339 #define PASSWDPRINT printf("%s:%s:%u:%u:%s:%s:%s\n", \
340 pw->pw_name, pw->pw_passwd, pw->pw_uid, \
341 pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
342
343 setpassent(1);
344 rv = RV_OK;
345 if (argc == 2) {
346 while ((pw = getpwent()) != NULL)
347 PASSWDPRINT;
348 } else {
349 for (i = 2; i < argc; i++) {
350 if (parsenum(argv[i], &id))
351 pw = getpwuid((uid_t)id);
352 else
353 pw = getpwnam(argv[i]);
354 if (pw != NULL)
355 PASSWDPRINT;
356 else {
357 rv = RV_NOTFOUND;
358 break;
359 }
360 }
361 }
362 endpwent();
363 return rv;
364 }
365
366
367 /*
368 * protocols
369 */
370
371 static int
372 protocols(int argc, char *argv[])
373 {
374 struct protoent *pe;
375 unsigned long id;
376 int i, rv;
377
378 assert(argc > 1);
379 assert(argv != NULL);
380
381 #define PROTOCOLSPRINT printfmtstrings(pe->p_aliases, " ", " ", \
382 "%-16s %5d", pe->p_name, pe->p_proto)
383
384 setprotoent(1);
385 rv = RV_OK;
386 if (argc == 2) {
387 while ((pe = getprotoent()) != NULL)
388 PROTOCOLSPRINT;
389 } else {
390 for (i = 2; i < argc; i++) {
391 if (parsenum(argv[i], &id))
392 pe = getprotobynumber((int)id);
393 else
394 pe = getprotobyname(argv[i]);
395 if (pe != NULL)
396 PROTOCOLSPRINT;
397 else {
398 rv = RV_NOTFOUND;
399 break;
400 }
401 }
402 }
403 endprotoent();
404 return rv;
405 }
406
407
408 /*
409 * services
410 */
411
412 static int
413 services(int argc, char *argv[])
414 {
415 struct servent *se;
416 unsigned long id;
417 char *proto;
418 int i, rv;
419
420 assert(argc > 1);
421 assert(argv != NULL);
422
423 #define SERVICESPRINT printfmtstrings(se->s_aliases, " ", " ", \
424 "%-16s %5d/%s", \
425 se->s_name, ntohs(se->s_port), se->s_proto)
426
427 setservent(1);
428 rv = RV_OK;
429 if (argc == 2) {
430 while ((se = getservent()) != NULL)
431 SERVICESPRINT;
432 } else {
433 for (i = 2; i < argc; i++) {
434 proto = strchr(argv[i], '/');
435 if (proto != NULL)
436 *proto++ = '\0';
437 if (parsenum(argv[i], &id))
438 se = getservbyport((int)id, proto);
439 else
440 se = getservbyname(argv[i], proto);
441 if (se != NULL)
442 SERVICESPRINT;
443 else {
444 rv = RV_NOTFOUND;
445 break;
446 }
447 }
448 }
449 endservent();
450 return rv;
451 }
452
453
454 /*
455 * shells
456 */
457
458 static int
459 shells(int argc, char *argv[])
460 {
461 const char *sh;
462 int i, rv;
463
464 assert(argc > 1);
465 assert(argv != NULL);
466
467 #define SHELLSPRINT printf("%s\n", sh)
468
469 setusershell();
470 rv = RV_OK;
471 if (argc == 2) {
472 while ((sh = getusershell()) != NULL)
473 SHELLSPRINT;
474 } else {
475 for (i = 2; i < argc; i++) {
476 setusershell();
477 while ((sh = getusershell()) != NULL) {
478 if (strcmp(sh, argv[i]) == 0) {
479 SHELLSPRINT;
480 break;
481 }
482 }
483 if (sh == NULL) {
484 rv = RV_NOTFOUND;
485 break;
486 }
487 }
488 }
489 endusershell();
490 return rv;
491 }
492