Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/group-member.c @ 9268:a553c18c572d
Rename sys_time_.h to sys_time.in.h.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Tue, 02 Oct 2007 00:37:40 +0200 |
| parents | 8a1a9361108c |
| children | bbbbbf4cd1c5 |
| rev | line source |
|---|---|
| 785 | 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 Free Software |
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4 Foundation, Inc. |
| 785 | 5 |
| 6 This program is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 2, or (at your option) | |
| 9 any later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with this program; if not, write to the Free Software Foundation, | |
|
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 785 | 19 |
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20 #include <config.h> |
| 785 | 21 |
| 4662 | 22 #include "group-member.h" |
| 23 | |
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24 #include <stdbool.h> |
| 785 | 25 #include <stdio.h> |
| 26 #include <sys/types.h> | |
| 4662 | 27 #include <stdlib.h> |
| 785 | 28 |
| 6275 | 29 #include <unistd.h> |
| 785 | 30 |
| 4542 | 31 #include "xalloc.h" |
| 785 | 32 |
| 33 struct group_info | |
| 34 { | |
| 35 int n_groups; | |
| 36 GETGROUPS_T *group; | |
| 37 }; | |
| 38 | |
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39 #if HAVE_GETGROUPS |
| 785 | 40 |
| 41 static void | |
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42 free_group_info (struct group_info const *g) |
| 785 | 43 { |
| 44 free (g->group); | |
| 45 } | |
| 46 | |
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47 static bool |
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48 get_group_info (struct group_info *gi) |
| 785 | 49 { |
| 50 int n_groups; | |
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51 int n_group_slots = getgroups (0, NULL); |
| 785 | 52 GETGROUPS_T *group; |
| 53 | |
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54 if (n_group_slots < 0) |
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55 return false; |
| 785 | 56 |
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57 /* Avoid xnmalloc, as it goes awry when SIZE_MAX < n_group_slots. */ |
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parents:
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58 if (xalloc_oversized (n_group_slots, sizeof *group)) |
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59 xalloc_die (); |
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60 group = xmalloc (n_group_slots * sizeof *group); |
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parents:
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61 n_groups = getgroups (n_group_slots, group); |
| 785 | 62 |
| 63 /* In case of error, the user loses. */ | |
| 64 if (n_groups < 0) | |
| 65 { | |
| 66 free (group); | |
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67 return false; |
| 785 | 68 } |
| 69 | |
| 70 gi->n_groups = n_groups; | |
| 71 gi->group = group; | |
| 72 | |
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73 return true; |
| 785 | 74 } |
| 75 | |
| 76 #endif /* not HAVE_GETGROUPS */ | |
| 77 | |
| 78 /* Return non-zero if GID is one that we have in our groups list. | |
| 79 If there is no getgroups function, return non-zero if GID matches | |
| 80 either of the current or effective group IDs. */ | |
| 81 | |
| 82 int | |
| 1188 | 83 group_member (gid_t gid) |
| 785 | 84 { |
| 85 #ifndef HAVE_GETGROUPS | |
| 86 return ((gid == getgid ()) || (gid == getegid ())); | |
| 87 #else | |
| 88 int i; | |
| 89 int found; | |
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parents:
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90 struct group_info gi; |
| 785 | 91 |
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parents:
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92 if (! get_group_info (&gi)) |
| 785 | 93 return 0; |
| 94 | |
| 95 /* Search through the list looking for GID. */ | |
| 96 found = 0; | |
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410ea3e253b9
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Paul Eggert <eggert@cs.ucla.edu>
parents:
4662
diff
changeset
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97 for (i = 0; i < gi.n_groups; i++) |
| 785 | 98 { |
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Paul Eggert <eggert@cs.ucla.edu>
parents:
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diff
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99 if (gid == gi.group[i]) |
| 785 | 100 { |
| 101 found = 1; | |
| 102 break; | |
| 103 } | |
| 104 } | |
| 790 | 105 |
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4830
410ea3e253b9
Revamp xalloc_oversized so that its count arg need not fit into size_t.
Paul Eggert <eggert@cs.ucla.edu>
parents:
4662
diff
changeset
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106 free_group_info (&gi); |
| 785 | 107 |
| 108 return found; | |
| 109 #endif /* HAVE_GETGROUPS */ | |
| 110 } | |
| 111 | |
| 112 #ifdef TEST | |
| 113 | |
| 114 char *program_name; | |
| 115 | |
| 116 int | |
| 4662 | 117 main (int argc, char **argv) |
| 785 | 118 { |
| 119 int i; | |
| 120 | |
| 121 program_name = argv[0]; | |
| 122 | |
| 123 for (i=1; i<argc; i++) | |
| 124 { | |
| 125 gid_t gid; | |
| 126 | |
| 127 gid = atoi (argv[i]); | |
| 128 printf ("%d: %s\n", gid, group_member (gid) ? "yes" : "no"); | |
| 129 } | |
| 130 exit (0); | |
| 131 } | |
| 132 | |
| 133 #endif /* TEST */ |