libexplain  1.4.D001
libexplain/group_in_groups.c
Go to the documentation of this file.
00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2008-2010, 2013 Peter Miller
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU Lesser General Public License as
00007  * published by the Free Software Foundation; either version 3 of the
00008  * License, or (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public License
00016  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00017  */
00018 
00019 #include <libexplain/ac/limits.h> /* for NGROUPS_MAX on Solaris */
00020 #include <libexplain/ac/sys/param.h>
00021 #include <libexplain/ac/unistd.h>
00022 
00023 #include <libexplain/group_in_groups.h>
00024 #include <libexplain/have_permission.h>
00025 
00026 
00027 int
00028 explain_group_in_groups(int gid, const explain_have_identity_t *hip)
00029 {
00030     gid_t           groups[NGROUPS_MAX];
00031     int             n;
00032     int             j;
00033 
00034     /*
00035      * FIXME: NFS only transports 16 of the groups (this is because
00036      * Solaris only supports NGROUPS_MAX=16, and Sun invented NFS).  We
00037      * need to diagnose the case where they are in the list of groups on
00038      * Linux (where NGROUPS_MAX > 16), but are not in the list of groups
00039      * on the NFS server.
00040      */
00041     if (gid == hip->gid)
00042         return 1;
00043     n = getgroups(NGROUPS_MAX, groups);
00044     for (j = 0; j < n; ++j)
00045         if (groups[j] == (gid_t)gid)
00046             return 1;
00047     return 0;
00048 }
00049 
00050 
00051 /* vim: set ts=8 sw=4 et : */