id.c revision 38468 
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 1.6 1998/02/18 17:35:16 steve 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		if ((rid = getgid()) != (eid = getegid()))
190			if ((gr = getgrgid(rid)))
191				(void)printf("rgid\t%s\n", gr->gr_name);
192			else
193				(void)printf("rgid\t%u\n", rid);
194		(void)printf("groups\t");
195		group(NULL, 1);
196	}
197}
198
199void
200current()
201{
202	struct group *gr;
203	struct passwd *pw;
204	int cnt, id, eid, lastid, ngroups;
205	gid_t groups[NGROUPS];
206	char *fmt;
207
208	id = getuid();
209	(void)printf("uid=%u", id);
210	if ((pw = getpwuid(id)))
211		(void)printf("(%s)", pw->pw_name);
212	if ((eid = geteuid()) != id) {
213		(void)printf(" euid=%u", eid);
214		if ((pw = getpwuid(eid)))
215			(void)printf("(%s)", pw->pw_name);
216	}
217	id = getgid();
218	(void)printf(" gid=%u", id);
219	if ((gr = getgrgid(id)))
220		(void)printf("(%s)", gr->gr_name);
221	if ((eid = getegid()) != id) {
222		(void)printf(" egid=%u", eid);
223		if ((gr = getgrgid(eid)))
224			(void)printf("(%s)", gr->gr_name);
225	}
226	if ((ngroups = getgroups(NGROUPS, groups))) {
227		for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
228		    fmt = ", %u", lastid = id) {
229			id = groups[cnt++];
230			if (lastid == id)
231				continue;
232			(void)printf(fmt, id);
233			if ((gr = getgrgid(id)))
234				(void)printf("(%s)", gr->gr_name);
235		}
236	}
237	(void)printf("\n");
238}
239
240void
241user(pw)
242	register struct passwd *pw;
243{
244	register struct group *gr;
245	register char *fmt;
246	int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1];
247
248	(void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name);
249	gid = pw->pw_gid;
250	(void)printf(" gid=%u", gid);
251	if ((gr = getgrgid(gid)))
252		(void)printf("(%s)", gr->gr_name);
253	ngroups = NGROUPS + 1;
254	(void) getgrouplist(pw->pw_name, gid, groups, &ngroups);
255	fmt = " groups=%u";
256	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
257		if (lastgid == (gid = groups[cnt]))
258			continue;
259		(void)printf(fmt, gid);
260		fmt = " %u";
261		if ((gr = getgrgid(gid)))
262			(void)printf("(%s)", gr->gr_name);
263		lastgid = gid;
264	}
265	(void)printf("\n");
266}
267
268void
269group(pw, nflag)
270	struct passwd *pw;
271	int nflag;
272{
273	struct group *gr;
274	int cnt, id, lastid, ngroups;
275	gid_t groups[NGROUPS + 1];
276	char *fmt;
277
278	if (pw) {
279		ngroups = NGROUPS + 1;
280		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
281	} else {
282		groups[0] = getgid();
283		ngroups = getgroups(NGROUPS, groups + 1) + 1;
284	}
285	fmt = nflag ? "%s" : "%u";
286	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
287		if (lastid == (id = groups[cnt]))
288			continue;
289		if (nflag) {
290			if ((gr = getgrgid(id)))
291				(void)printf(fmt, gr->gr_name);
292			else
293				(void)printf(*fmt == ' ' ? " %u" : "%u",
294				    id);
295			fmt = " %s";
296		} else {
297			(void)printf(fmt, id);
298			fmt = " %u";
299		}
300		lastid = id;
301	}
302	(void)printf("\n");
303}
304
305struct passwd *
306who(u)
307	char *u;
308{
309	struct passwd *pw;
310	long id;
311	char *ep;
312
313	/*
314	 * Translate user argument into a pw pointer.  First, try to
315	 * get it as specified.  If that fails, try it as a number.
316	 */
317	if ((pw = getpwnam(u)))
318		return(pw);
319	id = strtol(u, &ep, 10);
320	if (*u && !*ep && (pw = getpwuid(id)))
321		return(pw);
322	errx(1, "%s: no such user", u);
323	/* NOTREACHED */
324}
325
326void
327pline(pw)
328	struct passwd *pw;
329{
330	struct group *gr;
331	u_int eid, rid;
332	char *login;
333
334	if (!pw) {
335		if ((pw = getpwuid(rid = getuid())) == NULL)
336			err(1, "getpwuid");
337	}
338
339	(void)printf("%s:%s:%d:%d:%s:%d:%d:%s:%s:%s\n", pw->pw_name,
340			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
341			pw->pw_change, pw->pw_expire, pw->pw_gecos,
342			pw->pw_dir, pw->pw_shell);
343}
344
345
346void
347usage()
348{
349	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
350		"usage: id [user]",
351		"       id -G [-n] [user]",
352		"       id -g [-nr] [user]",
353		"       id -u [-nr] [user]");
354	exit(1);
355}
356