id.c revision 77314 
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  "$FreeBSD: head/usr.bin/id/id.c 77314 2001-05-28 06:14:48Z dd $";
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
58int	main __P((int, char *[]));
59void	current __P((void));
60void	pline __P((struct passwd *));
61void	pretty __P((struct passwd *));
62void	group __P((struct passwd *, int));
63void	usage __P((void));
64void	user __P((struct passwd *));
65struct passwd *
66	who __P((char *));
67
68int
69main(argc, argv)
70	int argc;
71	char *argv[];
72{
73	struct group *gr;
74	struct passwd *pw;
75	int Gflag, Pflag, ch, gflag, id, nflag, pflag, rflag, uflag;
76
77	Gflag = Pflag = gflag = nflag = pflag = rflag = uflag = 0;
78	while ((ch = getopt(argc, argv, "PGgnpru")) != -1)
79		switch(ch) {
80		case 'G':
81			Gflag = 1;
82			break;
83		case 'P':
84			Pflag = 1;
85			break;
86		case 'g':
87			gflag = 1;
88			break;
89		case 'n':
90			nflag = 1;
91			break;
92		case 'p':
93			pflag = 1;
94			break;
95		case 'r':
96			rflag = 1;
97			break;
98		case 'u':
99			uflag = 1;
100			break;
101		case '?':
102		default:
103			usage();
104		}
105	argc -= optind;
106	argv += optind;
107
108	switch(Gflag + Pflag + gflag + pflag + uflag) {
109	case 1:
110		break;
111	case 0:
112		if (!nflag && !rflag)
113			break;
114		/* FALLTHROUGH */
115	default:
116		usage();
117	}
118
119	pw = *argv ? who(*argv) : NULL;
120
121	if (gflag) {
122		id = pw ? pw->pw_gid : rflag ? getgid() : getegid();
123		if (nflag && (gr = getgrgid(id)))
124			(void)printf("%s\n", gr->gr_name);
125		else
126			(void)printf("%u\n", id);
127		exit(0);
128	}
129
130	if (uflag) {
131		id = pw ? pw->pw_uid : rflag ? getuid() : geteuid();
132		if (nflag && (pw = getpwuid(id)))
133			(void)printf("%s\n", pw->pw_name);
134		else
135			(void)printf("%u\n", id);
136		exit(0);
137	}
138
139	if (Gflag) {
140		group(pw, nflag);
141		exit(0);
142	}
143
144	if (Pflag) {
145		pline(pw);
146		exit(0);
147	}
148
149	if (pflag) {
150		pretty(pw);
151		exit(0);
152	}
153
154	if (pw)
155		user(pw);
156	else
157		current();
158	exit(0);
159}
160
161void
162pretty(pw)
163	struct passwd *pw;
164{
165	struct group *gr;
166	u_int eid, rid;
167	char *login;
168
169	if (pw) {
170		(void)printf("uid\t%s\n", pw->pw_name);
171		(void)printf("groups\t");
172		group(pw, 1);
173	} else {
174		if ((login = getlogin()) == NULL)
175			err(1, "getlogin");
176
177		pw = getpwuid(rid = getuid());
178		if (pw == NULL || strcmp(login, pw->pw_name))
179			(void)printf("login\t%s\n", login);
180		if (pw)
181			(void)printf("uid\t%s\n", pw->pw_name);
182		else
183			(void)printf("uid\t%u\n", rid);
184
185		if ((eid = geteuid()) != rid) {
186			if ((pw = getpwuid(eid)))
187				(void)printf("euid\t%s\n", pw->pw_name);
188			else
189				(void)printf("euid\t%u\n", eid);
190		}
191		if ((rid = getgid()) != (eid = getegid())) {
192			if ((gr = getgrgid(rid)))
193				(void)printf("rgid\t%s\n", gr->gr_name);
194			else
195				(void)printf("rgid\t%u\n", rid);
196		}
197		(void)printf("groups\t");
198		group(NULL, 1);
199	}
200}
201
202void
203current()
204{
205	struct group *gr;
206	struct passwd *pw;
207	int cnt, id, eid, lastid, ngroups;
208	gid_t groups[NGROUPS];
209	const char *fmt;
210
211	id = getuid();
212	(void)printf("uid=%u", id);
213	if ((pw = getpwuid(id)))
214		(void)printf("(%s)", pw->pw_name);
215	if ((eid = geteuid()) != id) {
216		(void)printf(" euid=%u", eid);
217		if ((pw = getpwuid(eid)))
218			(void)printf("(%s)", pw->pw_name);
219	}
220	id = getgid();
221	(void)printf(" gid=%u", id);
222	if ((gr = getgrgid(id)))
223		(void)printf("(%s)", gr->gr_name);
224	if ((eid = getegid()) != id) {
225		(void)printf(" egid=%u", eid);
226		if ((gr = getgrgid(eid)))
227			(void)printf("(%s)", gr->gr_name);
228	}
229	if ((ngroups = getgroups(NGROUPS, groups))) {
230		for (fmt = " groups=%u", lastid = -1, cnt = 0; cnt < ngroups;
231		    fmt = ", %u", lastid = id) {
232			id = groups[cnt++];
233			if (lastid == id)
234				continue;
235			(void)printf(fmt, id);
236			if ((gr = getgrgid(id)))
237				(void)printf("(%s)", gr->gr_name);
238		}
239	}
240	(void)printf("\n");
241}
242
243void
244user(pw)
245	struct passwd *pw;
246{
247	struct group *gr;
248	const char *fmt;
249	int cnt, gid, lastgid, ngroups, groups[NGROUPS + 1];
250
251	(void)printf("uid=%u(%s)", pw->pw_uid, pw->pw_name);
252	gid = pw->pw_gid;
253	(void)printf(" gid=%u", gid);
254	if ((gr = getgrgid(gid)))
255		(void)printf("(%s)", gr->gr_name);
256	ngroups = NGROUPS + 1;
257	(void) getgrouplist(pw->pw_name, gid, groups, &ngroups);
258	fmt = " groups=%u";
259	for (lastgid = -1, cnt = 0; cnt < ngroups; ++cnt) {
260		if (lastgid == (gid = groups[cnt]))
261			continue;
262		(void)printf(fmt, gid);
263		fmt = ", %u";
264		if ((gr = getgrgid(gid)))
265			(void)printf("(%s)", gr->gr_name);
266		lastgid = gid;
267	}
268	(void)printf("\n");
269}
270
271void
272group(pw, nflag)
273	struct passwd *pw;
274	int nflag;
275{
276	struct group *gr;
277	int cnt, id, lastid, ngroups;
278	gid_t groups[NGROUPS + 1];
279	const char *fmt;
280
281	if (pw) {
282		ngroups = NGROUPS + 1;
283		(void) getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
284	} else {
285		groups[0] = getgid();
286		ngroups = getgroups(NGROUPS, groups + 1) + 1;
287	}
288	fmt = nflag ? "%s" : "%u";
289	for (lastid = -1, cnt = 0; cnt < ngroups; ++cnt) {
290		if (lastid == (id = groups[cnt]))
291			continue;
292		if (nflag) {
293			if ((gr = getgrgid(id)))
294				(void)printf(fmt, gr->gr_name);
295			else
296				(void)printf(*fmt == ' ' ? " %u" : "%u",
297				    id);
298			fmt = " %s";
299		} else {
300			(void)printf(fmt, id);
301			fmt = " %u";
302		}
303		lastid = id;
304	}
305	(void)printf("\n");
306}
307
308struct passwd *
309who(u)
310	char *u;
311{
312	struct passwd *pw;
313	long id;
314	char *ep;
315
316	/*
317	 * Translate user argument into a pw pointer.  First, try to
318	 * get it as specified.  If that fails, try it as a number.
319	 */
320	if ((pw = getpwnam(u)))
321		return(pw);
322	id = strtol(u, &ep, 10);
323	if (*u && !*ep && (pw = getpwuid(id)))
324		return(pw);
325	errx(1, "%s: no such user", u);
326	/* NOTREACHED */
327}
328
329void
330pline(pw)
331	struct passwd *pw;
332{
333	u_int rid;
334
335	if (!pw) {
336		if ((pw = getpwuid(rid = getuid())) == NULL)
337			err(1, "getpwuid");
338	}
339
340	(void)printf("%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", pw->pw_name,
341			pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
342			(long)pw->pw_change, (long)pw->pw_expire, pw->pw_gecos,
343			pw->pw_dir, pw->pw_shell);
344}
345
346
347void
348usage()
349{
350	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n",
351		"usage: id [user]",
352		"       id -G [-n] [user]",
353		"       id -P [user]",
354		"       id -g [-nr] [user]",
355		"       id -p [user]",
356		"       id -u [-nr] [user]");
357	exit(1);
358}
359