Remove --quiet argument when installing locales
[glibc.git] / grp / initgroups.c
blobf056fbf5aa6aa14c49dea8d7553f9f0ed1f72f41
1 /* Copyright (C) 1989, 1991-2018 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, see
16 <http://www.gnu.org/licenses/>. */
18 #include <assert.h>
19 #include <errno.h>
20 #include <grp.h>
21 #include <limits.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <sys/param.h>
26 #include <sys/types.h>
27 #include <nsswitch.h>
28 #include <scratch_buffer.h>
29 #include <config.h>
31 #include "../nscd/nscd-client.h"
32 #include "../nscd/nscd_proto.h"
34 #ifdef LINK_OBSOLETE_NSL
35 # define DEFAULT_CONFIG "compat [NOTFOUND=return] files"
36 #else
37 # define DEFAULT_CONFIG "files"
38 #endif
40 /* Type of the lookup function. */
41 typedef enum nss_status (*initgroups_dyn_function) (const char *, gid_t,
42 long int *, long int *,
43 gid_t **, long int, int *);
45 static bool use_initgroups_entry;
48 #include "compat-initgroups.c"
51 static int
52 internal_getgrouplist (const char *user, gid_t group, long int *size,
53 gid_t **groupsp, long int limit)
55 #ifdef USE_NSCD
56 if (__nss_not_use_nscd_group > 0
57 && ++__nss_not_use_nscd_group > NSS_NSCD_RETRY)
58 __nss_not_use_nscd_group = 0;
59 if (!__nss_not_use_nscd_group
60 && !__nss_database_custom[NSS_DBSIDX_group])
62 int n = __nscd_getgrouplist (user, group, size, groupsp, limit);
63 if (n >= 0)
64 return n;
66 /* nscd is not usable. */
67 __nss_not_use_nscd_group = 1;
69 #endif
71 enum nss_status status = NSS_STATUS_UNAVAIL;
72 int no_more = 0;
74 /* Never store more than the starting *SIZE number of elements. */
75 assert (*size > 0);
76 (*groupsp)[0] = group;
77 /* Start is one, because we have the first group as parameter. */
78 long int start = 1;
80 if (__nss_initgroups_database == NULL)
82 if (__nss_database_lookup ("initgroups", NULL, "",
83 &__nss_initgroups_database) < 0)
85 if (__nss_group_database == NULL)
86 no_more = __nss_database_lookup ("group", NULL, DEFAULT_CONFIG,
87 &__nss_group_database);
89 __nss_initgroups_database = __nss_group_database;
91 else
92 use_initgroups_entry = true;
94 else
95 /* __nss_initgroups_database might have been set through
96 __nss_configure_lookup in which case use_initgroups_entry was
97 not set here. */
98 use_initgroups_entry = __nss_initgroups_database != __nss_group_database;
100 service_user *nip = __nss_initgroups_database;
101 while (! no_more)
103 long int prev_start = start;
105 initgroups_dyn_function fct = __nss_lookup_function (nip,
106 "initgroups_dyn");
107 if (fct == NULL)
108 status = compat_call (nip, user, group, &start, size, groupsp,
109 limit, &errno);
110 else
111 status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp,
112 limit, &errno));
114 /* Remove duplicates. */
115 long int cnt = prev_start;
116 while (cnt < start)
118 long int inner;
119 for (inner = 0; inner < prev_start; ++inner)
120 if ((*groupsp)[inner] == (*groupsp)[cnt])
121 break;
123 if (inner < prev_start)
124 (*groupsp)[cnt] = (*groupsp)[--start];
125 else
126 ++cnt;
129 /* This is really only for debugging. */
130 if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)
131 __libc_fatal ("illegal status in internal_getgrouplist");
133 /* For compatibility reason we will continue to look for more
134 entries using the next service even though data has already
135 been found if the nsswitch.conf file contained only a 'groups'
136 line and no 'initgroups' line. If the latter is available
137 we always respect the status. This means that the default
138 for successful lookups is to return. */
139 if ((use_initgroups_entry || status != NSS_STATUS_SUCCESS)
140 && nss_next_action (nip, status) == NSS_ACTION_RETURN)
141 break;
143 if (nip->next == NULL)
144 no_more = -1;
145 else
146 nip = nip->next;
149 return start;
152 /* Store at most *NGROUPS members of the group set for USER into
153 *GROUPS. Also include GROUP. The actual number of groups found is
154 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
156 getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
158 long int size = MAX (1, *ngroups);
160 gid_t *newgroups = (gid_t *) malloc (size * sizeof (gid_t));
161 if (__glibc_unlikely (newgroups == NULL))
162 /* No more memory. */
163 // XXX This is wrong. The user provided memory, we have to use
164 // XXX it. The internal functions must be called with the user
165 // XXX provided buffer and not try to increase the size if it is
166 // XXX too small. For initgroups a flag could say: increase size.
167 return -1;
169 int total = internal_getgrouplist (user, group, &size, &newgroups, -1);
171 memcpy (groups, newgroups, MIN (*ngroups, total) * sizeof (gid_t));
173 free (newgroups);
175 int retval = total > *ngroups ? -1 : total;
176 *ngroups = total;
178 return retval;
181 nss_interface_function (getgrouplist)
183 /* Initialize the group set for the current user
184 by reading the group database and using all groups
185 of which USER is a member. Also include GROUP. */
187 initgroups (const char *user, gid_t group)
189 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
191 /* No extra groups allowed. */
192 return 0;
194 #else
196 long int size;
197 gid_t *groups;
198 int ngroups;
199 int result;
201 /* We always use sysconf even if NGROUPS_MAX is defined. That way, the
202 limit can be raised in the kernel configuration without having to
203 recompile libc. */
204 long int limit = __sysconf (_SC_NGROUPS_MAX);
206 if (limit > 0)
207 /* We limit the size of the intially allocated array. */
208 size = MIN (limit, 64);
209 else
210 /* No fixed limit on groups. Pick a starting buffer size. */
211 size = 16;
213 groups = (gid_t *) malloc (size * sizeof (gid_t));
214 if (__glibc_unlikely (groups == NULL))
215 /* No more memory. */
216 return -1;
218 ngroups = internal_getgrouplist (user, group, &size, &groups, limit);
220 /* Try to set the maximum number of groups the kernel can handle. */
222 result = setgroups (ngroups, groups);
223 while (result == -1 && errno == EINVAL && --ngroups > 0);
225 free (groups);
227 return result;
228 #endif
231 nss_interface_function (initgroups)