1 /* Copyright (C) 1989,91,93,1996-2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <sys/param.h>
27 #include <sys/types.h>
30 #include "../nscd/nscd-client.h"
31 #include "../nscd/nscd_proto.h"
34 /* Type of the lookup function. */
35 typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
36 long int *, long int *,
37 gid_t **, long int, int *);
39 /* The lookup function for the first entry of this service. */
40 extern int __nss_group_lookup (service_user **nip, const char *name,
42 extern void *__nss_lookup_function (service_user *ni, const char *fct_name);
44 extern service_user *__nss_group_database attribute_hidden;
47 #include "compat-initgroups.c"
51 internal_getgrouplist (const char *user, gid_t group, long int *size,
52 gid_t **groupsp, long int limit)
55 if (__nss_not_use_nscd_group > 0
56 && ++__nss_not_use_nscd_group > NSS_NSCD_RETRY)
57 __nss_not_use_nscd_group = 0;
58 if (!__nss_not_use_nscd_group)
60 int n = __nscd_getgrouplist (user, group, size, groupsp, limit);
64 /* nscd is not usable. */
65 __nss_not_use_nscd_group = 1;
69 service_user *nip = NULL;
70 initgroups_dyn_function fct;
71 enum nss_status status = NSS_STATUS_UNAVAIL;
73 /* Start is one, because we have the first group as parameter. */
78 if (__nss_group_database != NULL)
81 nip = __nss_group_database;
84 no_more = __nss_database_lookup ("group", NULL,
85 "compat [NOTFOUND=return] files", &nip);
89 fct = __nss_lookup_function (nip, "initgroups_dyn");
93 status = compat_call (nip, user, group, &start, size, groupsp,
96 if (nss_next_action (nip, NSS_STATUS_UNAVAIL) != NSS_ACTION_CONTINUE)
100 status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp,
103 /* This is really only for debugging. */
104 if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
105 __libc_fatal ("illegal status in internal_getgrouplist");
107 if (status != NSS_STATUS_SUCCESS
108 && nss_next_action (nip, status) == NSS_ACTION_RETURN)
111 if (nip->next == NULL)
120 /* Store at most *NGROUPS members of the group set for USER into
121 *GROUPS. Also include GROUP. The actual number of groups found is
122 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
124 getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
127 long int size = *ngroups;
130 newgroups = (gid_t *) malloc (size * sizeof (gid_t));
131 if (__builtin_expect (newgroups == NULL, 0))
132 /* No more memory. */
133 // XXX This is wrong. The user provided memory, we have to use
134 // XXX it. The internal functions must be called with the user
135 // XXX provided buffer and not try to increase the size if it is
136 // XXX too small. For initgroups a flag could say: increase size.
139 result = internal_getgrouplist (user, group, &size, &newgroups, -1);
141 memcpy (groups, newgroups, MIN (*ngroups, result) * sizeof (gid_t));
143 if (result > *ngroups)
155 static_link_warning (getgrouplist)
157 /* Initialize the group set for the current user
158 by reading the group database and using all groups
159 of which USER is a member. Also include GROUP. */
161 initgroups (const char *user, gid_t group)
163 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
165 /* No extra groups allowed. */
175 /* We always use sysconf even if NGROUPS_MAX is defined. That way, the
176 limit can be raised in the kernel configuration without having to
178 long int limit = __sysconf (_SC_NGROUPS_MAX);
181 /* We limit the size of the intially allocated array. */
182 size = MIN (limit, 64);
184 /* No fixed limit on groups. Pick a starting buffer size. */
187 groups = (gid_t *) malloc (size * sizeof (gid_t));
188 if (__builtin_expect (groups == NULL, 0))
189 /* No more memory. */
192 ngroups = internal_getgrouplist (user, group, &size, &groups, limit);
194 /* Try to set the maximum number of groups the kernel can handle. */
196 result = setgroups (ngroups, groups);
197 while (result == -1 && errno == EINVAL && --ngroups > 0);
205 static_link_warning (initgroups)