1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 #ifndef lint
32 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\
33 The Regents of the University of California. All rights reserved.");
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)id.c 8.3 (Berkeley) 4/28/95";
39 #else
40 __RCSID("$NetBSD: id.c,v 1.32 2011/09/16 15:39:26 joerg Exp $");
41 #endif
42 #endif /* not lint */
43
44 #include <sys/param.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <grp.h>
49 #include <pwd.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 static void current(void);
56 static void pretty(struct passwd *);
57 static void group(struct passwd *, int);
58 __dead static void usage(void);
59 static void user(struct passwd *);
60 static struct passwd *who(char *);
61
62 static int maxgroups;
63 static gid_t *groups;
64
65 int
main(int argc,char * argv[])66 main(int argc, char *argv[])
67 {
68 struct group *gr;
69 struct passwd *pw;
70 int ch, id;
71 int Gflag, gflag, nflag, pflag, rflag, uflag;
72 const char *opts;
73
74 Gflag = gflag = nflag = pflag = rflag = uflag = 0;
75
76 if (strcmp(getprogname(), "groups") == 0) {
77 Gflag = 1;
78 nflag = 1;
79 opts = "";
80 if (argc > 2)
81 usage();
82 } else if (strcmp(getprogname(), "whoami") == 0) {
83 uflag = 1;
84 nflag = 1;
85 opts = "";
86 if (argc > 1)
87 usage();
88 } else
89 opts = "Ggnpru";
90
91 while ((ch = getopt(argc, argv, opts)) != -1)
92 switch (ch) {
93 case 'G':
94 Gflag = 1;
95 break;
96 case 'g':
97 gflag = 1;
98 break;
99 case 'n':
100 nflag = 1;
101 break;
102 case 'p':
103 pflag = 1;
104 break;
105 case 'r':
106 rflag = 1;
107 break;
108 case 'u':
109 uflag = 1;
110 break;
111 case '?':
112 default:
113 usage();
114 }
115 argc -= optind;
116 argv += optind;
117
118 switch (Gflag + gflag + pflag + uflag) {
119 case 1:
120 break;
121 case 0:
122 if (!nflag && !rflag)
123 break;
124 /* FALLTHROUGH */
125 default:
126 usage();
127 }
128
129 if (strcmp(opts, "") != 0 && argc > 1)
130 usage();
131
132 pw = *argv ? who(*argv) : NULL;
133
134 maxgroups = sysconf(_SC_NGROUPS_MAX);
135 if ((groups = malloc((maxgroups + 1) * sizeof(gid_t))) == NULL)
136 err(1, NULL);
137
138 if (gflag) {
139 id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
140 if (nflag && (gr = getgrgid(id)))
141 (void)printf("%s\n", gr->gr_name);
142 else
143 (void)printf("%u\n", id);
144 goto done;
145 }
146
147 if (uflag) {
148 id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
149 if (nflag && (pw = getpwuid(id)))
150 (void)printf("%s\n", pw->pw_name);
151 else
152 (void)printf("%u\n", id);
153 goto done;
154 }
155
156 if (Gflag) {
157 group(pw, nflag);
158 goto done;
159 }
160
161 if (pflag) {
162 pretty(pw);
163 goto done;
164 }
165
166 if (pw)
167 user(pw);
168 else
169 current();
170 done:
171 free(groups);
172
173 return 0;
174 }
175
176 static void
pretty(struct passwd * pw)177 pretty(struct passwd *pw)
178 {
179 struct group *gr;
180 u_int eid, rid;
181 char *login;
182
183 if (pw) {
184 (void)printf("uid\t%s\n", pw->pw_name);
185 (void)printf("groups\t");
186 group(pw, 1);
187 } else {
188 if ((login = getlogin()) == NULL)
189 err(1, "getlogin");
190
191 pw = getpwuid(rid = getuid());
192 if (pw == NULL || strcmp(login, pw->pw_name))
193 (void)printf("login\t%s\n", login);
194 if (pw)
195 (void)printf("uid\t%s\n", pw->pw_name);
196 else
197 (void)printf("uid\t%u\n", rid);
198
199 if ((eid = geteuid()) != rid) {
200 if ((pw = getpwuid(eid)) != NULL)
201 (void)printf("euid\t%s\n", pw->pw_name);
202 else
203 (void)printf("euid\t%u\n", eid);
204 }
205 if ((rid = getgid()) != (eid = getegid())) {
206 if ((gr = getgrgid(rid)) != NULL)
207 (void)printf("rgid\t%s\n", gr->gr_name);
208 else
209 (void)printf("rgid\t%u\n", rid);
210 }
211 (void)printf("groups\t");
212 group(NULL, 1);
213 }
214 }
215
216 static void
current(void)217 current(void)
218 {
219 struct group *gr;
220 struct passwd *pw;
221 gid_t gid, egid, lastid;
222 uid_t uid, euid;
223 int cnt, ngroups;
224 const char *fmt;
225
226 uid = getuid();
227 (void)printf("uid=%ju", (uintmax_t)uid);
228 if ((pw = getpwuid(uid)) != NULL)
229 (void)printf("(%s)", pw->pw_name);
230 gid = getgid();
231 (void)printf(" gid=%ju", (uintmax_t)gid);
232 if ((gr = getgrgid(gid)) != NULL)
233 (void)printf("(%s)", gr->gr_name);
234 if ((euid = geteuid()) != uid) {
235 (void)printf(" euid=%ju", (uintmax_t)euid);
236 if ((pw = getpwuid(euid)) != NULL)
237 (void)printf("(%s)", pw->pw_name);
238 }
239 if ((egid = getegid()) != gid) {
240 (void)printf(" egid=%ju", (uintmax_t)egid);
241 if ((gr = getgrgid(egid)) != NULL)
242 (void)printf("(%s)", gr->gr_name);
243 }
244 if ((ngroups = getgroups(maxgroups, groups)) != 0) {
245 for (fmt = " groups=%ju", lastid = -1, cnt = 0; cnt < ngroups;
246 fmt = ",%ju", lastid = gid, cnt++) {
247 gid = groups[cnt];
248 if (lastid == gid)
249 continue;
250 (void)printf(fmt, (uintmax_t)gid);
251 if ((gr = getgrgid(gid)) != NULL)
252 (void)printf("(%s)", gr->gr_name);
253 }
254 }
255 (void)printf("\n");
256 }
257
258 static void
user(struct passwd * pw)259 user(struct passwd *pw)
260 {
261 struct group *gr;
262 const char *fmt;
263 int cnt, id, lastid, ngroups;
264 gid_t *glist = groups;
265
266 id = pw->pw_uid;
267 (void)printf("uid=%u(%s)", id, pw->pw_name);
268 (void)printf(" gid=%lu", (u_long)pw->pw_gid);
269 if ((gr = getgrgid(pw->pw_gid)) != NULL)
270 (void)printf("(%s)", gr->gr_name);
271 ngroups = maxgroups + 1;
272 if (getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups) == -1) {
273 glist = malloc(ngroups * sizeof(gid_t));
274 (void) getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups);
275 }
276 for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
277 fmt=",%u", lastid = id, cnt++) {
278 id = glist[cnt];
279 if (lastid == id)
280 continue;
281 (void)printf(fmt, id);
282 if ((gr = getgrgid(id)) != NULL)
283 (void)printf("(%s)", gr->gr_name);
284 }
285 (void)printf("\n");
286 if (glist != groups)
287 free(glist);
288 }
289
290 static void
group(struct passwd * pw,int nflag)291 group(struct passwd *pw, int nflag)
292 {
293 struct group *gr;
294 int cnt, ngroups;
295 gid_t id, lastid;
296 const char *fmt;
297 gid_t *glist = groups;
298
299 if (pw) {
300 ngroups = maxgroups;
301 if (getgrouplist(pw->pw_name, pw->pw_gid, glist, &ngroups)
302 == -1) {
303 glist = malloc(ngroups * sizeof(gid_t));
304 (void) getgrouplist(pw->pw_name, pw->pw_gid, glist,
305 &ngroups);
306 }
307 } else {
308 glist[0] = getgid();
309 ngroups = getgroups(maxgroups, glist + 1) + 1;
310 }
311 fmt = nflag ? "%s" : "%u";
312 for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
313 if (lastid == (id = glist[cnt]) || (cnt && id == glist[0]))
314 continue;
315 if (nflag) {
316 if ((gr = getgrgid(id)) != NULL)
317 (void)printf(fmt, gr->gr_name);
318 else
319 (void)printf(*fmt == ' ' ? " %u" : "%u",
320 id);
321 fmt = " %s";
322 } else {
323 (void)printf(fmt, id);
324 fmt = " %u";
325 }
326 lastid = id;
327 }
328 (void)printf("\n");
329 if (glist != groups)
330 free(glist);
331 }
332
333 static struct passwd *
who(char * u)334 who(char *u)
335 {
336 struct passwd *pw;
337 long id;
338 char *ep;
339
340 /*
341 * Translate user argument into a pw pointer. First, try to
342 * get it as specified. If that fails, try it as a number.
343 */
344 if ((pw = getpwnam(u)) != NULL)
345 return pw;
346 id = strtol(u, &ep, 10);
347 if (*u && !*ep && (pw = getpwuid(id)))
348 return pw;
349 errx(1, "%s: No such user", u);
350 /* NOTREACHED */
351 return NULL;
352 }
353
354 static void
usage(void)355 usage(void)
356 {
357
358 if (strcmp(getprogname(), "groups") == 0) {
359 (void)fprintf(stderr, "usage: groups [user]\n");
360 } else if (strcmp(getprogname(), "whoami") == 0) {
361 (void)fprintf(stderr, "usage: whoami\n");
362 } else {
363 (void)fprintf(stderr, "usage: id [user]\n");
364 (void)fprintf(stderr, " id -G [-n] [user]\n");
365 (void)fprintf(stderr, " id -g [-nr] [user]\n");
366 (void)fprintf(stderr, " id -p [user]\n");
367 (void)fprintf(stderr, " id -u [-nr] [user]\n");
368 }
369 exit(1);
370 }
371