id.c revision 48566 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1991, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)id.c	8.2 (Berkeley) 2/16/94";
43#endif
44static const char rcsid[] =
45	"$Id: id.c,v 1.7 1998/08/21 06:47:58 obrien Exp $";
46#endif /* not lint */
47
48#include <sys/param.h>
49
50#include <err.h>
51#include <grp.h>
52#include <pwd.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57
58void	current __P((void));
59void	pline __P((struct passwd *));
60void	pretty __P((struct passwd *));
61void	group __P((struct passwd *, int));
62void	usage __P((void));
63void	user __P((struct passwd *));
64struct passwd *
65	who __P((char *));
66
67int
68main(argc, argv)
69	int argc;
70	char *argv[];
71{
72	struct group *gr;
73	struct passwd *pw;
74	int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
75
76	Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
77	while ((ch = getopt(argc, argv, "PGgnpru")) != -1)
78		switch(ch) {
79		case 'G':
80			Gflag = 1;
81			break;
82		case 'P':
83			Pflag = 1;
84			break;
85		case 'g':
86			gflag = 1;
87			break;
88		case 'n':
89			nflag = 1;
90			break;
91		case 'p':
92			pflag = 1;
93			break;
94		case 'r':
95			rflag = 1;
96			break;
97		case 'u':
98			uflag = 1;
99			break;
100		case '?':
101		default:
102			usage();
103		}
104	argc -= optind;
105	argv += optind;
106
107	switch(Gflag + Pflag + gflag + pflag + uflag) {
108	case 1:
109		break;
110	case 0:
111		if (!nflag && !rflag)
112			break;
113		/* FALLTHROUGH */
114	default:
115		usage();
116	}
117
118	pw = *argv ? who(*argv) : NULL;
119
120	if (gflag) {
121		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
122		if (nflag && (gr = getgrgid(id)))
123			(void)printf("%s\n", gr->gr_name);
124		else
125			(void)printf("%u\n", id);
126		exit(0);
127	}
128
129	if (uflag) {
130		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
131		if (nflag && (pw = getpwuid(id)))
132			(void)printf("%s\n", pw->pw_name);
133		else
134			(void)printf("%u\n", id);
135		exit(0);
136	}
137
138	if (Gflag) {
139		group(pw, nflag);
140		exit(0);
141	}
142
143	if (Pflag) {
144		pline(pw);
145		exit(0);
146	}
147
148	if (pflag) {
149		pretty(pw);
150		exit(0);
151	}
152
153	if (pw)
154		user(pw);
155	else
156		current();
157	exit(0);
158}
159
160void
161pretty(pw)
162	struct passwd *pw;
163{
164	struct group *gr;
165	u_int eid, rid;
166	char *login;
167
168	if (pw) {
169		(void)printf("uid\t%s\n", pw->pw_name);
170		(void)printf("groups\t");
171		group(pw, 1);
172	} else {
173		if ((login = getlogin()) == NULL)
174			err(1, "getlogin");
175
176		pw = getpwuid(rid = getuid());
177		if (pw == NULL || strcmp(login, pw->pw_name))
178			(void)printf("login\t%s\n", login);
179		if (pw)
180			(void)printf("uid\t%s\n", pw->pw_name);
181		else
182			(void)printf("uid\t%u\n", rid);
183
184		if ((eid = geteuid()) != rid) {
185			if ((pw = getpwuid(eid)))
186				(void)printf("euid\t%s\n", pw->pw_name);
187			else
188				(void)printf("euid\t%u\n", eid);
189		}
190		if ((rid = getgid()) != (eid = getegid())) {
191			if ((gr = getgrgid(rid)))
192				(void)printf("rgid\t%s\n", gr->gr_name);
193			else
194				(void)printf("rgid\t%u\n", rid);
195		}
196		(void)printf("groups\t");
197		group(NULL, 1);
198	}
199}
200
201void
202current()
203{
204	struct group *gr;
205	struct passwd *pw;
206	int cnt, id, eid, lastid, ngroups;
207	gid_t groups[NGROUPS];
208	char *fmt;
209
210	id = getuid();
211	(void)printf("uid=%u", id);
212	if ((pw = getpwuid(id)))
213		(void)printf("(%s)", pw->pw_name);
214	if ((eid = geteuid()) != id) {
215		(void)printf(" euid=%u", eid);
216		if ((pw = getpwuid(eid)))
217			(void)printf("(%s)", pw->pw_name);
218	}
219	id = getgid();
220	(void)printf(" gid=%u", id);
221	if ((gr = getgrgid(id)))
222		(void)printf("(%s)", gr->gr_name);
223	if ((eid = getegid()) != id) {
224		(void)printf(" egid=%u", eid);
225		if ((gr = getgrgid(eid)))
226			(void)printf("(%s)", gr->gr_name);
227	}
228	if ((ngroups = getgroups(NGROUPS, groups))) {
229		for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
230		    fmt = ", %u", lastid = id) {
231			id = groups[cnt++];
232			if (lastid == id)
233				continue;
234			(void)printf(fmt, id);
235			if ((gr = getgrgid(id)))
236				(void)printf("(%s)", gr->gr_name);
237		}
238	}
239	(void)printf("\n");
240}
241
242void
243user(pw)
244	register struct passwd *pw;
245{
246	register struct group *gr;
247	register char *fmt;
248	int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1];
249
250	(void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name);
251	gid = pw->pw_gid;
252	(void)printf(" gid=%u", gid);
253	if ((gr = getgrgid(gid)))
254		(void)printf("(%s)", gr->gr_name);
255	ngroups = NGROUPS + 1;
256	(void) getgrouplist(pw->pw_name, gid, groups, &ngroups);
257	fmt = " groups=%u";
258	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
259		if (lastgid == (gid = groups[cnt]))
260			continue;
261		(void)printf(fmt, gid);
262		fmt = " %u";
263		if ((gr = getgrgid(gid)))
264			(void)printf("(%s)", gr->gr_name);
265		lastgid = gid;
266	}
267	(void)printf("\n");
268}
269
270void
271group(pw, nflag)
272	struct passwd *pw;
273	int nflag;
274{
275	struct group *gr;
276	int cnt, id, lastid, ngroups;
277	gid_t groups[NGROUPS + 1];
278	char *fmt;
279
280	if (pw) {
281		ngroups = NGROUPS + 1;
282		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
283	} else {
284		groups[0] = getgid();
285		ngroups = getgroups(NGROUPS, groups + 1) + 1;
286	}
287	fmt = nflag ? "%s" : "%u";
288	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
289		if (lastid == (id = groups[cnt]))
290			continue;
291		if (nflag) {
292			if ((gr = getgrgid(id)))
293				(void)printf(fmt, gr->gr_name);
294			else
295				(void)printf(*fmt == ' ' ? " %u" : "%u",
296				    id);
297			fmt = " %s";
298		} else {
299			(void)printf(fmt, id);
300			fmt = " %u";
301		}
302		lastid = id;
303	}
304	(void)printf("\n");
305}
306
307struct passwd *
308who(u)
309	char *u;
310{
311	struct passwd *pw;
312	long id;
313	char *ep;
314
315	/*
316	 * Translate user argument into a pw pointer.  First, try to
317	 * get it as specified.  If that fails, try it as a number.
318	 */
319	if ((pw = getpwnam(u)))
320		return(pw);
321	id = strtol(u, &ep, 10);
322	if (*u && !*ep && (pw = getpwuid(id)))
323		return(pw);
324	errx(1, "%s: no such user", u);
325	/* NOTREACHED */
326}
327
328void
329pline(pw)
330	struct passwd *pw;
331{
332	struct group *gr;
333	u_int eid, rid;
334	char *login;
335
336	if (!pw) {
337		if ((pw = getpwuid(rid = getuid())) == NULL)
338			err(1, "getpwuid");
339	}
340
341	(void)printf("%s:%s:%d:%d:%s:%d:%d:%s:%s:%s\n", pw->pw_name,
342			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
343			pw->pw_change, pw->pw_expire, pw->pw_gecos,
344			pw->pw_dir, pw->pw_shell);
345}
346
347
348void
349usage()
350{
351	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
352		"usage: id [user]",
353		"       id -G [-n] [user]",
354		"       id -g [-nr] [user]",
355		"       id -u [-nr] [user]");
356	exit(1);
357}
358