usr/src/cmd/groups/groups.c

   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
  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
 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 }