1 /* Copyright (C) 1989, 91, 93, 96, 97, 98 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
25 #include <sys/types.h>
29 /* Type of the lookup function. */
30 typedef enum nss_status (*initgroups_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;
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 *groups, long int limit, int *errnop)
54 struct group grpbuf, *g;
55 size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
57 enum nss_status status;
58 set_function setgrent_fct;
59 get_function getgrent_fct;
60 end_function endgrent_fct;
62 getgrent_fct = __nss_lookup_function (nip, "getgrent_r");
63 if (getgrent_fct == NULL)
64 return NSS_STATUS_UNAVAIL;
66 setgrent_fct = __nss_lookup_function (nip, "setgrent");
69 status = _CALL_DL_FCT (setgrent_fct, ());
70 if (status != NSS_STATUS_SUCCESS)
74 endgrent_fct = __nss_lookup_function (nip, "endgrent");
76 tmpbuf = __alloca (buflen);
80 while ((status = _CALL_DL_FCT (getgrent_fct,
81 (&grpbuf, tmpbuf, buflen, errnop)),
82 status == NSS_STATUS_TRYAGAIN)
86 tmpbuf = __alloca (buflen);
89 if (status != NSS_STATUS_SUCCESS)
93 if (g->gr_gid != group)
97 for (m = g->gr_mem; *m != NULL; ++m)
98 if (strcmp (*m, user) == 0)
100 /* Matches user. Insert this group. */
101 if (*start == *size && limit <= 0)
103 /* Need a bigger buffer. */
104 groups = realloc (groups, *size * sizeof (*groups));
110 groups[*start] = g->gr_gid;
114 /* Can't take any more groups; stop searching. */
121 while (status == NSS_STATUS_SUCCESS);
125 _CALL_DL_FCT (endgrent_fct, ());
127 return NSS_STATUS_SUCCESS;
130 /* Initialize the group set for the current user
131 by reading the group database and using all groups
132 of which USER is a member. Also include GROUP. */
134 initgroups (user, group)
138 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
140 /* No extra groups allowed. */
145 service_user *nip = NULL;
146 initgroups_function fct;
147 enum nss_status status = NSS_STATUS_UNAVAIL;
149 /* Start is one, because we have the first group as parameter. */
154 # define limit NGROUPS_MAX
158 long int limit = sysconf (_SC_NGROUPS_MAX);
163 /* No fixed limit on groups. Pick a starting buffer size. */
167 groups = malloc (size * sizeof (gid_t *));
171 if (__nss_group_database != NULL)
174 nip = __nss_group_database;
177 no_more = __nss_database_lookup ("group", NULL,
178 "compat [NOTFOUND=return] files", &nip);
182 fct = __nss_lookup_function (nip, "initgroups");
185 status = compat_call (nip, user, group, &start, &size, groups,
188 status = _CALL_DL_FCT (fct, (user, group, &start, &size, groups, limit,
191 if (nip->next == NULL)
197 return setgroups (start, groups);