usr/src/ucbcmd/groups/groups.c

   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
  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
  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 }