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annotate lib/group-member.c @ 17848:ab58d4870664

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version-etc: new year * doc/gnulib.texi: * lib/version-etc.c (COPYRIGHT_YEAR): Update copyright date. * all files: Run 'make update-copyright'.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 01 Jan 2015 01:38:23 +0000
parents 344018b6e5d7
children
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1 /* group-member.c -- determine whether group id is in calling user's group list
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2
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3 Copyright (C) 1994, 1997-1998, 2003, 2005-2006, 2009-2015 Free Software
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4 Foundation, Inc.
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5
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6 This program is free software: you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3 of the License, or
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9 (at your option) any later version.
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11 This program is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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18
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19 #include <config.h>
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20
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21 /* Specification. */
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22 #include <unistd.h>
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23
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24 #include <stdio.h>
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25 #include <sys/types.h>
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26 #include <stdlib.h>
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27
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28 #include "xalloc-oversized.h"
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29
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30 /* Most processes have no more than this many groups, and for these
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31 processes we can avoid using malloc. */
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32 enum { GROUPBUF_SIZE = 100 };
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33
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34 struct group_info
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35 {
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36 gid_t *group;
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37 gid_t groupbuf[GROUPBUF_SIZE];
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38 };
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39
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40 static void
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41 free_group_info (struct group_info const *g)
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42 {
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43 if (g->group != g->groupbuf)
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44 free (g->group);
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45 }
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46
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47 static int
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48 get_group_info (struct group_info *gi)
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49 {
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50 int n_groups = getgroups (GROUPBUF_SIZE, gi->groupbuf);
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51 gi->group = gi->groupbuf;
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52
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53 if (n_groups < 0)
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54 {
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55 int n_group_slots = getgroups (0, NULL);
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56 if (0 <= n_group_slots
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57 && ! xalloc_oversized (n_group_slots, sizeof *gi->group))
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58 {
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59 gi->group = malloc (n_group_slots * sizeof *gi->group);
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60 if (gi->group)
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61 n_groups = getgroups (n_group_slots, gi->group);
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62 }
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63 }
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64
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65 /* In case of error, the user loses. */
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66 return n_groups;
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67 }
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68
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69 /* Return non-zero if GID is one that we have in our groups list.
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70 Note that the groups list is not guaranteed to contain the current
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71 or effective group ID, so they should generally be checked
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72 separately. */
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73
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74 int
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75 group_member (gid_t gid)
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76 {
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77 int i;
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78 int found;
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79 struct group_info gi;
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80 int n_groups = get_group_info (&gi);
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81
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82 /* Search through the list looking for GID. */
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83 found = 0;
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84 for (i = 0; i < n_groups; i++)
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85 {
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86 if (gid == gi.group[i])
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87 {
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88 found = 1;
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89 break;
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90 }
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91 }
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92
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93 free_group_info (&gi);
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94
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95 return found;
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96 }
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97
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98 #ifdef TEST
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99
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100 char *program_name;
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101
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102 int
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103 main (int argc, char **argv)
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104 {
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105 int i;
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106
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107 program_name = argv[0];
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108
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109 for (i = 1; i < argc; i++)
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110 {
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111 gid_t gid;
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112
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113 gid = atoi (argv[i]);
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114 printf ("%d: %s\n", gid, group_member (gid) ? "yes" : "no");
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115 }
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116 exit (0);
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117 }
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118
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119 #endif /* TEST */