xref: /illumos-gate/usr/src/cmd/groups/groups.c (revision 49335bde)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 #pragma ident	"%Z%%M%	%I%	%E% SMI"
41 
42 /*
43  * groups - show group memberships
44  */
45 /* LINTLIBRARY PROTOLIB1 */
46 
47 #include <grp.h>
48 #include <pwd.h>
49 #include <stdio.h>
50 #include <unistd.h>
51 #include <stdlib.h>
52 
53 extern struct group *getgrgid();
54 extern struct passwd *getpwnam();
55 extern int _getgroupsbymember(const char *, gid_t[], int, int);
56 
57 static void showgroups();
58 
59 static int ngroups_max;
60 
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 	int xval = 0;
65 	struct passwd *pw;
66 
67 	ngroups_max = sysconf(_SC_NGROUPS_MAX);
68 
69 	if (ngroups_max < 0) {
70 		(void) fprintf(stderr,
71 			"groups: could not get configuration info\n");
72 		exit(1);
73 	}
74 
75 	if (ngroups_max == 0)
76 		exit(0);
77 
78 	if (argc == 1) {
79 
80 		if ((pw = getpwuid(getuid())) == NULL) {
81 			(void) fprintf(stderr, "groups: No passwd entry\n");
82 			xval = 1;
83 		} else
84 			showgroups(pw);
85 
86 	} else while (*++argv) {
87 
88 		if ((pw = getpwnam(*argv)) == NULL) {
89 			(void) fprintf(stderr,
90 				"groups: %s : No such user\n", *argv);
91 			xval = 1;
92 		} else {
93 			if (argc > 2)
94 				(void) printf("%s : ", *argv);
95 			showgroups(pw);
96 		}
97 	}
98 
99 	return (xval);
100 
101 }
102 
103 static void
showgroups(struct passwd * pw)104 showgroups(struct passwd *pw)
105 {
106 	struct group *gr;
107 	static gid_t *groups = NULL;
108 	int ngroups;
109 	int i;
110 
111 	if (groups == NULL) {
112 		if ((groups = (gid_t *)calloc((uint_t)ngroups_max,
113 						sizeof (gid_t))) == 0) {
114 			(void) fprintf(stderr,
115 				"allocation of %d bytes failed\n",
116 				ngroups_max * sizeof (gid_t));
117 			exit(1);
118 		}
119 	}
120 	groups[0] = pw->pw_gid;
121 
122 	ngroups = _getgroupsbymember(pw->pw_name, groups, ngroups_max, 1);
123 
124 	if (gr = getgrgid(groups[0]))
125 		(void) printf("%s", gr->gr_name);
126 	else
127 		(void) printf("%d", (int)pw->pw_gid);
128 
129 	for (i = 1; i < ngroups; i++) {
130 		if ((gr = getgrgid(groups[i])))
131 			(void) printf(" %s", gr->gr_name);
132 		else
133 			(void) printf(" %d", (int)groups[i]);
134 	}
135 
136 	(void) printf("\n");
137 }
138