1 /* Copyright (C) 1989,91,93,1996-2005,2006 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. */
76 /* Never store more than the starting *SIZE number of elements. */
78 (*groupsp)[0] = group;
80 if (__nss_group_database != NULL)
83 nip = __nss_group_database;
86 no_more = __nss_database_lookup ("group", NULL,
87 "compat [NOTFOUND=return] files", &nip);
91 long int prev_start = start;
93 fct = __nss_lookup_function (nip, "initgroups_dyn");
97 status = compat_call (nip, user, group, &start, size, groupsp,
100 if (nss_next_action (nip, NSS_STATUS_UNAVAIL) != NSS_ACTION_CONTINUE)
104 status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp,
107 /* Remove duplicates. */
108 long int cnt = prev_start;
112 for (inner = 0; inner < prev_start; ++inner)
113 if ((*groupsp)[inner] == (*groupsp)[cnt])
116 if (inner < prev_start)
117 (*groupsp)[cnt] = (*groupsp)[--start];
122 /* This is really only for debugging. */
123 if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
124 __libc_fatal ("illegal status in internal_getgrouplist");
126 if (status != NSS_STATUS_SUCCESS
127 && nss_next_action (nip, status) == NSS_ACTION_RETURN)
130 if (nip->next == NULL)
139 /* Store at most *NGROUPS members of the group set for USER into
140 *GROUPS. Also include GROUP. The actual number of groups found is
141 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
143 getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
145 long int size = MAX (1, *ngroups);
147 gid_t *newgroups = (gid_t *) malloc ((size + 1) * sizeof (gid_t));
148 if (__builtin_expect (newgroups == NULL, 0))
149 /* No more memory. */
150 // XXX This is wrong. The user provided memory, we have to use
151 // XXX it. The internal functions must be called with the user
152 // XXX provided buffer and not try to increase the size if it is
153 // XXX too small. For initgroups a flag could say: increase size.
156 int total = internal_getgrouplist (user, group, &size, &newgroups, -1);
158 memcpy (groups, newgroups, MIN (*ngroups, total) * sizeof (gid_t));
162 int retval = total > *ngroups ? -1 : total;
168 static_link_warning (getgrouplist)
170 /* Initialize the group set for the current user
171 by reading the group database and using all groups
172 of which USER is a member. Also include GROUP. */
174 initgroups (const char *user, gid_t group)
176 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
178 /* No extra groups allowed. */
188 /* We always use sysconf even if NGROUPS_MAX is defined. That way, the
189 limit can be raised in the kernel configuration without having to
191 long int limit = __sysconf (_SC_NGROUPS_MAX);
194 /* We limit the size of the intially allocated array. */
195 size = MIN (limit, 64);
197 /* No fixed limit on groups. Pick a starting buffer size. */
200 groups = (gid_t *) malloc (size * sizeof (gid_t));
201 if (__builtin_expect (groups == NULL, 0))
202 /* No more memory. */
205 ngroups = internal_getgrouplist (user, group, &size, &groups, limit);
207 /* Try to set the maximum number of groups the kernel can handle. */
209 result = setgroups (ngroups, groups);
210 while (result == -1 && errno == EINVAL && --ngroups > 0);
218 static_link_warning (initgroups)