groups.c revision 4321:a8930ec16e52 
1/*
2 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5
6/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
7/*	  All Rights Reserved  	*/
8
9
10/*
11 * Copyright (c) 1980 Regents of the University of California.
12 * All rights reserved. The Berkeley software License Agreement
13 * specifies the terms and conditions for redistribution.
14 */
15
16#pragma ident	"%Z%%M%	%I%	%E% SMI"
17
18/*
19 * groups
20 */
21
22#include <sys/types.h>
23#include <sys/param.h>
24#include <grp.h>
25#include <pwd.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <string.h>
30
31static void showgroups(char *user);
32
33int
34main(int argc, char *argv[])
35{
36	int ngroups, i;
37	char *sep = "";
38	struct group *gr;
39	gid_t groups[NGROUPS_UMAX];
40
41	if (argc > 1) {
42		for (i = 1; i < argc; i++)
43			showgroups(argv[i]);
44		exit(0);
45	}
46
47	ngroups = getgroups(NGROUPS_UMAX, groups);
48	if (getpwuid(getuid()) == NULL) {
49		(void) fprintf(stderr, "groups: could not find passwd entry\n");
50		exit(1);
51	}
52
53	for (i = 0; i < ngroups; i++) {
54		gr = getgrgid(groups[i]);
55		if (gr == NULL) {
56			(void) printf("%s%u", sep, groups[i]);
57			sep = " ";
58			continue;
59		}
60		(void) printf("%s%s", sep, gr->gr_name);
61		sep = " ";
62	}
63
64	(void) printf("\n");
65	return (0);
66}
67
68static void
69showgroups(char *user)
70{
71	struct group *gr;
72	struct passwd *pw;
73	char **cp;
74	char *sep = "";
75	int pwgid_printed = 0;
76
77	if ((pw = getpwnam(user)) == NULL) {
78		(void) fprintf(stderr, "groups: %s : No such user\n", user);
79		return;
80	}
81	setgrent();
82	(void) printf("%s : ", user);
83	while (gr = getgrent()) {
84		if (pw->pw_gid == gr->gr_gid) {
85			/*
86			 * To avoid duplicate group entries
87			 */
88			if (pwgid_printed == 0) {
89			    (void) printf("%s%s", sep, gr->gr_name);
90			    sep = " ";
91			    pwgid_printed = 1;
92			}
93			continue;
94		}
95		for (cp = gr->gr_mem; cp && *cp; cp++)
96			if (strcmp(*cp, user) == 0) {
97				(void) printf("%s%s", sep, gr->gr_name);
98				sep = " ";
99				break;
100			}
101	}
102	(void) printf("\n");
103	endgrent();
104}
105