1 /*
2 * Copyright 2009 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 /*
17 * groups
18 */
19
20 #include <sys/types.h>
21 #include <sys/param.h>
22 #include <alloca.h>
23 #include <grp.h>
24 #include <pwd.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <unistd.h>
28 #include <string.h>
29
30 static void showgroups(char *user);
31
32 int
main(int argc,char * argv[])33 main(int argc, char *argv[])
34 {
35 int ngroups, i;
36 char *sep = "";
37 struct group *gr;
38 gid_t *groups;
39 int maxgrp = sysconf(_SC_NGROUPS_MAX);
40
41 groups = alloca(maxgrp * sizeof (gid_t));
42
43 if (argc > 1) {
44 for (i = 1; i < argc; i++)
45 showgroups(argv[i]);
46 exit(0);
47 }
48
49 ngroups = getgroups(maxgrp, groups);
50 if (getpwuid(getuid()) == NULL) {
51 (void) fprintf(stderr, "groups: could not find passwd entry\n");
52 exit(1);
53 }
54
55 for (i = 0; i < ngroups; i++) {
56 gr = getgrgid(groups[i]);
57 if (gr == NULL) {
58 (void) printf("%s%u", sep, groups[i]);
59 sep = " ";
60 continue;
61 }
62 (void) printf("%s%s", sep, gr->gr_name);
63 sep = " ";
64 }
65
66 (void) printf("\n");
67 return (0);
68 }
69
70 static void
showgroups(char * user)71 showgroups(char *user)
72 {
73 struct group *gr;
74 struct passwd *pw;
75 char **cp;
76 char *sep = "";
77 int pwgid_printed = 0;
78
79 if ((pw = getpwnam(user)) == NULL) {
80 (void) fprintf(stderr, "groups: %s : No such user\n", user);
81 return;
82 }
83 setgrent();
84 (void) printf("%s : ", user);
85 while (gr = getgrent()) {
86 if (pw->pw_gid == gr->gr_gid) {
87 /*
88 * To avoid duplicate group entries
89 */
90 if (pwgid_printed == 0) {
91 (void) printf("%s%s", sep, gr->gr_name);
92 sep = " ";
93 pwgid_printed = 1;
94 }
95 continue;
96 }
97 for (cp = gr->gr_mem; cp && *cp; cp++)
98 if (strcmp(*cp, user) == 0) {
99 (void) printf("%s%s", sep, gr->gr_name);
100 sep = " ";
101 break;
102 }
103 }
104 (void) printf("\n");
105 endgrent();
106 }
107