1 /* $OpenBSD: getent.c,v 1.23 2021/10/11 14:28:26 deraadt Exp $ */
2 /* $NetBSD: getent.c,v 1.7 2005/08/24 14:31:02 ginsbach Exp $ */
3
4 /*-
5 * Copyright (c) 2004 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Luke Mewburn.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/types.h>
34 #include <sys/socket.h>
35
36 #include <ctype.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <grp.h>
40 #include <limits.h>
41 #include <netdb.h>
42 #include <pwd.h>
43 #include <stdio.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <unistd.h>
48
49 #include <net/if.h>
50 #include <netinet/in.h> /* for INET6_ADDRSTRLEN */
51 #include <netinet/if_ether.h>
52
53 #include <arpa/inet.h>
54
55 #include <rpc/rpc.h>
56
57 static void usage(void);
58 static int ethers(int, char *[]);
59 static int group(int, char *[]);
60 static int hosts(int, char *[]);
61 static int passwd(int, char *[]);
62 static int protocols(int, char *[]);
63 static int rpc(int, char *[]);
64 static int services(int, char *[]);
65 static int shells(int, char *[]);
66 extern char *__progname;
67
68 enum {
69 RV_OK = 0,
70 RV_USAGE = 1,
71 RV_NOTFOUND = 2,
72 RV_NOENUM = 3
73 };
74
75 static struct getentdb {
76 const char *name;
77 int (*fn)(int, char *[]);
78 const char *pledge;
79 const char *unveil;
80 } databases[] = {
81 { "ethers", ethers, "stdio rpath", "/etc/ethers" },
82 { "group", group, "stdio getpw", NULL },
83 { "hosts", hosts, "stdio dns", NULL },
84 { "passwd", passwd, "stdio getpw", NULL },
85 { "protocols", protocols, "stdio rpath", "/etc/protocols" },
86 { "rpc", rpc, "stdio rpath", "/etc/rpc" },
87 { "services", services, "stdio rpath", "/etc/services" },
88 { "shells", shells, "stdio rpath", "/etc/shells" },
89
90 { NULL, NULL, },
91 };
92
93 int
main(int argc,char * argv[])94 main(int argc, char *argv[])
95 {
96 struct getentdb *curdb;
97
98 if (argc < 2)
99 usage();
100 for (curdb = databases; curdb->name != NULL; curdb++) {
101 if (strcmp(curdb->name, argv[1]) == 0) {
102 if (curdb->unveil != NULL) {
103 if (unveil(curdb->unveil, "r") == -1)
104 err(1, "unveil %s", curdb->unveil);
105 }
106 if (pledge(curdb->pledge, NULL) == -1)
107 err(1, "pledge");
108
109 exit(curdb->fn(argc, argv));
110 break;
111 }
112 }
113 fprintf(stderr, "%s: unknown database: %s\n", __progname, argv[1]);
114 return RV_USAGE;
115 }
116
117 static void
usage(void)118 usage(void)
119 {
120 fprintf(stderr, "usage: %s database [key ...]\n", __progname);
121 exit(RV_USAGE);
122 }
123
124 /*
125 * printfmtstrings --
126 * vprintf(format, ...),
127 * then the aliases (beginning with prefix, separated by sep),
128 * then a newline
129 */
130 static void
printfmtstrings(char * strings[],const char * prefix,const char * sep,const char * fmt,...)131 printfmtstrings(char *strings[], const char *prefix, const char *sep,
132 const char *fmt, ...)
133 {
134 va_list ap;
135 const char *curpref;
136 int i;
137
138 va_start(ap, fmt);
139 vprintf(fmt, ap);
140 va_end(ap);
141
142 curpref = prefix;
143 for (i = 0; strings[i] != NULL; i++) {
144 printf("%s%s", curpref, strings[i]);
145 curpref = sep;
146 }
147 printf("\n");
148 }
149
150 #define ETHERSPRINT printf("%-17s %s\n", ether_ntoa(eap), hp)
151
152 static int
ethers(int argc,char * argv[])153 ethers(int argc, char *argv[])
154 {
155 char hostname[HOST_NAME_MAX+1], *hp;
156 int i, rv = RV_OK;
157 struct ether_addr ea, *eap;
158
159 if (argc == 2) {
160 fprintf(stderr, "%s: Enumeration not supported on ethers\n",
161 __progname);
162 rv = RV_NOENUM;
163 } else {
164 for (i = 2; i < argc; i++) {
165 if ((eap = ether_aton(argv[i])) == NULL) {
166 eap = &ea;
167 hp = argv[i];
168 if (ether_hostton(hp, eap) != 0) {
169 rv = RV_NOTFOUND;
170 break;
171 }
172 } else {
173 hp = hostname;
174 if (ether_ntohost(hp, eap) != 0) {
175 rv = RV_NOTFOUND;
176 break;
177 }
178 }
179 ETHERSPRINT;
180 }
181 }
182 return rv;
183 }
184
185 #define GROUPPRINT \
186 printfmtstrings(gr->gr_mem, ":", ",", "%s:%s:%u", \
187 gr->gr_name, gr->gr_passwd, gr->gr_gid)
188
189 static int
group(int argc,char * argv[])190 group(int argc, char *argv[])
191 {
192 struct group *gr;
193 const char *err;
194 gid_t gid;
195 int i, rv = RV_OK;
196
197 setgroupent(1);
198 if (argc == 2) {
199 while ((gr = getgrent()) != NULL)
200 GROUPPRINT;
201 } else {
202 for (i = 2; i < argc; i++) {
203 if ((gr = getgrnam(argv[i])) == NULL) {
204 gid = strtonum(argv[i], 0, GID_MAX, &err);
205 if (err == NULL)
206 gr = getgrgid(gid);
207 }
208 if (gr != NULL)
209 GROUPPRINT;
210 else {
211 rv = RV_NOTFOUND;
212 break;
213 }
214 }
215 }
216 endgrent();
217 return rv;
218 }
219
220 static void
hostsprint(const struct hostent * he)221 hostsprint(const struct hostent *he)
222 {
223 char buf[INET6_ADDRSTRLEN];
224
225 if (inet_ntop(he->h_addrtype, he->h_addr, buf, sizeof(buf)) == NULL)
226 strlcpy(buf, "# unknown", sizeof(buf));
227 printfmtstrings(he->h_aliases, " ", " ", "%-39s %s", buf, he->h_name);
228 }
229 static int
hostsaddrinfo(const char * name)230 hostsaddrinfo(const char *name)
231 {
232 struct addrinfo hints, *res, *res0;
233 char buf[INET6_ADDRSTRLEN];
234 int rv;
235
236 rv = RV_NOTFOUND;
237 memset(buf, 0, sizeof(buf));
238 memset(&hints, 0, sizeof(hints));
239 hints.ai_family = AF_UNSPEC;
240 hints.ai_socktype = SOCK_DGRAM;
241
242 if (getaddrinfo(name, NULL, &hints, &res0) != 0)
243 return (rv);
244 for (res = res0; res; res = res->ai_next) {
245 if ((res->ai_family != AF_INET6 && res->ai_family != AF_INET) ||
246 getnameinfo(res->ai_addr, res->ai_addrlen, buf, sizeof(buf),
247 NULL, 0, NI_NUMERICHOST) != 0)
248 strlcpy(buf, "# unknown", sizeof(buf));
249 else
250 rv = RV_OK;
251 printf("%-39s %s\n", buf, name);
252 }
253 freeaddrinfo(res0);
254
255 return (rv);
256 }
257
258 static int
hosts(int argc,char * argv[])259 hosts(int argc, char *argv[])
260 {
261 struct in6_addr in6;
262 struct in_addr in;
263 int i, rv = RV_OK;
264 struct hostent *he;
265
266 if (argc == 2) {
267 fprintf(stderr, "%s: Enumeration not supported on hosts\n",
268 __progname);
269 rv = RV_NOENUM;
270 } else {
271 for (i = 2; i < argc; i++) {
272 he = NULL;
273 if (inet_pton(AF_INET6, argv[i], (void *)&in6) > 0)
274 he = gethostbyaddr(&in6, sizeof(in6), AF_INET6);
275 else if (inet_pton(AF_INET, argv[i], (void *)&in) > 0)
276 he = gethostbyaddr(&in, sizeof(in), AF_INET);
277 if (he != NULL)
278 hostsprint(he);
279 else if ((rv = hostsaddrinfo(argv[i])) == RV_NOTFOUND)
280 break;
281 }
282 }
283 return rv;
284 }
285
286 #define PASSWDPRINT \
287 printf("%s:%s:%u:%u:%s:%s:%s\n", \
288 pw->pw_name, pw->pw_passwd, pw->pw_uid, \
289 pw->pw_gid, pw->pw_gecos, pw->pw_dir, pw->pw_shell)
290
291 static int
passwd(int argc,char * argv[])292 passwd(int argc, char *argv[])
293 {
294 struct passwd *pw;
295 const char *err;
296 uid_t uid;
297 int i, rv = RV_OK;
298
299 setpassent(1);
300 if (argc == 2) {
301 while ((pw = getpwent()) != NULL)
302 PASSWDPRINT;
303 } else {
304 for (i = 2; i < argc; i++) {
305 if ((pw = getpwnam(argv[i])) == NULL) {
306 uid = strtonum(argv[i], 0, UID_MAX, &err);
307 if (err == NULL)
308 pw = getpwuid(uid);
309 }
310 if (pw != NULL)
311 PASSWDPRINT;
312 else {
313 rv = RV_NOTFOUND;
314 break;
315 }
316 }
317 }
318 endpwent();
319 return rv;
320 }
321
322 #define PROTOCOLSPRINT \
323 printfmtstrings(pe->p_aliases, " ", " ", \
324 "%-16s %5d", pe->p_name, pe->p_proto)
325
326 static int
protocols(int argc,char * argv[])327 protocols(int argc, char *argv[])
328 {
329 struct protoent *pe;
330 const char *err;
331 int proto;
332 int i, rv = RV_OK;
333
334 setprotoent(1);
335 if (argc == 2) {
336 while ((pe = getprotoent()) != NULL)
337 PROTOCOLSPRINT;
338 } else {
339 for (i = 2; i < argc; i++) {
340 proto = strtonum(argv[i], 0, INT_MAX, &err);
341 if (!err)
342 pe = getprotobynumber(proto);
343 else
344 pe = getprotobyname(argv[i]);
345 if (pe != NULL)
346 PROTOCOLSPRINT;
347 else {
348 rv = RV_NOTFOUND;
349 break;
350 }
351 }
352 }
353 endprotoent();
354 return rv;
355 }
356
357 #define RPCPRINT \
358 printfmtstrings(re->r_aliases, " ", " ", \
359 "%-16s %6d", re->r_name, re->r_number)
360
361 static int
rpc(int argc,char * argv[])362 rpc(int argc, char *argv[])
363 {
364 struct rpcent *re;
365 const char *err;
366 int rpc;
367 int i, rv = RV_OK;
368
369 setrpcent(1);
370 if (argc == 2) {
371 while ((re = getrpcent()) != NULL)
372 RPCPRINT;
373 } else {
374 for (i = 2; i < argc; i++) {
375 rpc = strtonum(argv[i], 0, INT_MAX, &err);
376 if (!err)
377 re = getrpcbynumber(rpc);
378 else
379 re = getrpcbyname(argv[i]);
380 if (re != NULL)
381 RPCPRINT;
382 else {
383 rv = RV_NOTFOUND;
384 break;
385 }
386 }
387 }
388 endrpcent();
389 return rv;
390 }
391
392 #define SERVICESPRINT \
393 printfmtstrings(se->s_aliases, " ", " ", \
394 "%-16s %5d/%s", se->s_name, ntohs(se->s_port), se->s_proto)
395
396 static int
services(int argc,char * argv[])397 services(int argc, char *argv[])
398 {
399 struct servent *se;
400 const char *err;
401 char *proto;
402 in_port_t port;
403 int i, rv = RV_OK;
404
405 setservent(1);
406 if (argc == 2) {
407 while ((se = getservent()) != NULL)
408 SERVICESPRINT;
409 } else {
410 for (i = 2; i < argc; i++) {
411 if ((proto = strchr(argv[i], '/')) != NULL)
412 *proto++ = '\0';
413 port = strtonum(argv[i], 0, IPPORT_HILASTAUTO, &err);
414 if (!err)
415 se = getservbyport(htons(port), proto);
416 else
417 se = getservbyname(argv[i], proto);
418 if (se != NULL)
419 SERVICESPRINT;
420 else {
421 rv = RV_NOTFOUND;
422 break;
423 }
424 }
425 }
426 endservent();
427 return rv;
428 }
429
430 #define SHELLSPRINT printf("%s\n", sh)
431
432 static int
shells(int argc,char * argv[])433 shells(int argc, char *argv[])
434 {
435 const char *sh;
436 int i, rv = RV_OK;
437
438 setusershell();
439 if (argc == 2) {
440 while ((sh = getusershell()) != NULL)
441 SHELLSPRINT;
442 } else {
443 for (i = 2; i < argc; i++) {
444 setusershell();
445 while ((sh = getusershell()) != NULL) {
446 if (strcmp(sh, argv[i]) == 0) {
447 SHELLSPRINT;
448 break;
449 }
450 }
451 if (sh == NULL) {
452 rv = RV_NOTFOUND;
453 break;
454 }
455 }
456 }
457 endusershell();
458 return rv;
459 }
460