1 /* Copyright (C) 1989,91,93,1996-2001, 2002 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/types.h>
29 /* Type of the lookup function. */
30 typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
31 long int *, long int *,
32 gid_t **, long int, int *);
33 /* Prototype for the setgrent functions we use here. */
34 typedef enum nss_status (*set_function) (void);
36 /* Prototype for the endgrent functions we use here. */
37 typedef enum nss_status (*end_function) (void);
39 /* Prototype for the setgrent functions we use here. */
40 typedef enum nss_status (*get_function) (struct group *, char *,
43 /* The lookup function for the first entry of this service. */
44 extern int __nss_group_lookup (service_user **nip, const char *name,
46 extern void *__nss_lookup_function (service_user *ni, const char *fct_name);
48 extern service_user *__nss_group_database attribute_hidden;
50 static enum nss_status
51 compat_call (service_user *nip, const char *user, gid_t group, long int *start,
52 long int *size, gid_t **groupsp, long int limit, int *errnop)
55 size_t buflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
57 enum nss_status status;
58 set_function setgrent_fct;
59 get_function getgrent_fct;
60 end_function endgrent_fct;
61 gid_t *groups = *groupsp;
63 getgrent_fct = __nss_lookup_function (nip, "getgrent_r");
64 if (getgrent_fct == NULL)
65 return NSS_STATUS_UNAVAIL;
67 setgrent_fct = __nss_lookup_function (nip, "setgrent");
70 status = DL_CALL_FCT (setgrent_fct, ());
71 if (status != NSS_STATUS_SUCCESS)
75 endgrent_fct = __nss_lookup_function (nip, "endgrent");
77 tmpbuf = __alloca (buflen);
81 while ((status = DL_CALL_FCT (getgrent_fct,
82 (&grpbuf, tmpbuf, buflen, errnop)),
83 status == NSS_STATUS_TRYAGAIN)
87 tmpbuf = __alloca (buflen);
90 if (status != NSS_STATUS_SUCCESS)
93 if (grpbuf.gr_gid != group)
97 for (m = grpbuf.gr_mem; *m != NULL; ++m)
98 if (strcmp (*m, user) == 0)
100 /* Matches user. Insert this group. */
101 if (__builtin_expect (*start == *size, 0))
103 /* Need a bigger buffer. */
107 if (limit > 0 && *size == limit)
108 /* We reached the maximum. */
114 newsize = MIN (limit, 2 * *size);
116 newgroups = realloc (groups, newsize * sizeof (*groups));
117 if (newgroups == NULL)
119 *groupsp = groups = newgroups;
123 groups[*start] = grpbuf.gr_gid;
130 while (status == NSS_STATUS_SUCCESS);
134 DL_CALL_FCT (endgrent_fct, ());
136 return NSS_STATUS_SUCCESS;
140 internal_getgrouplist (const char *user, gid_t group, long int *size,
141 gid_t **groupsp, long int limit)
143 service_user *nip = NULL;
144 initgroups_dyn_function fct;
145 enum nss_status status = NSS_STATUS_UNAVAIL;
147 /* Start is one, because we have the first group as parameter. */
152 if (__nss_group_database != NULL)
155 nip = __nss_group_database;
158 no_more = __nss_database_lookup ("group", NULL,
159 "compat [NOTFOUND=return] files", &nip);
163 fct = __nss_lookup_function (nip, "initgroups_dyn");
167 status = compat_call (nip, user, group, &start, size, groupsp,
170 if (nss_next_action (nip, NSS_STATUS_UNAVAIL) != NSS_ACTION_CONTINUE)
174 status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp,
177 /* This is really only for debugging. */
178 if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
179 __libc_fatal ("illegal status in internal_getgrouplist");
181 if (status != NSS_STATUS_SUCCESS
182 && nss_next_action (nip, status) == NSS_ACTION_RETURN)
185 if (nip->next == NULL)
194 /* Store at most *NGROUPS members of the group set for USER into
195 *GROUPS. Also include GROUP. The actual number of groups found is
196 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
198 getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
201 long int size = *ngroups;
204 newgroups = (gid_t *) malloc (size * sizeof (gid_t));
205 if (__builtin_expect (newgroups == NULL, 0))
206 /* No more memory. */
209 result = internal_getgrouplist (user, group, &size, &newgroups, -1);
210 if (result > *ngroups)
218 memcpy (groups, newgroups, *ngroups * sizeof (gid_t));
224 /* Initialize the group set for the current user
225 by reading the group database and using all groups
226 of which USER is a member. Also include GROUP. */
228 initgroups (const char *user, gid_t group)
230 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
232 /* No extra groups allowed. */
242 /* We always use sysconf even if NGROUPS_MAX is defined. That way, the
243 limit can be raised in the kernel configuration without having to
245 long int limit = __sysconf (_SC_NGROUPS_MAX);
251 /* No fixed limit on groups. Pick a starting buffer size. */
255 groups = (gid_t *) malloc (size * sizeof (gid_t));
256 if (__builtin_expect (groups == NULL, 0))
257 /* No more memory. */
260 ngroups = internal_getgrouplist (user, group, &size, &groups, limit);
262 /* Try to set the maximum number of groups the kernel can handle. */
264 result = setgroups (ngroups, groups);
265 while (result == -1 && errno == EINVAL && --ngroups > 0);