1 /* Copyright (C) 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <not-cancel.h>
28 #include "nscd-client.h"
29 #include "nscd_proto.h"
32 libc_locked_map_ptr (map_handle);
33 /* Note that we only free the structure if necessary. The memory
34 mapping is not removed since it is not visible to the malloc
36 libc_freeres_fn (gr_map_free)
39 if (map_handle.mapped != NO_MAPPING)
40 free (map_handle.mapped);
45 __nscd_getgrouplist (const char *user, gid_t group, long int *size,
46 gid_t **groupsp, long int limit)
48 size_t userlen = strlen (user) + 1;
49 const initgr_response_header *initgr_resp = NULL;
50 char *respdata = NULL;
55 /* If the mapping is available, try to search there instead of
56 communicating with the nscd. */
57 struct mapped_database *mapped = __nscd_get_map_ref (GETFDGR, "group",
58 &map_handle, &gc_cycle);
60 if (mapped != NO_MAPPING)
62 const struct datahead *found = __nscd_cache_search (INITGROUPS, user,
66 initgr_resp = &found->data[0].initgrdata;
67 respdata = (char *) (initgr_resp + 1);
68 char *recend = (char *) found->data + found->recsize;
70 if (respdata + initgr_resp->ngrps * sizeof (int32_t) > recend)
75 /* If we do not have the cache mapped, try to get the data over the
77 initgr_response_header initgr_resp_mem;
78 if (initgr_resp == NULL)
80 sock = __nscd_open_socket (user, userlen, INITGROUPS, &initgr_resp_mem,
81 sizeof (initgr_resp_mem));
83 /* nscd not running or wrong version or hosts caching disabled. */
84 __nss_not_use_nscd_group = 1;
86 initgr_resp = &initgr_resp_mem;
89 if (initgr_resp->found == 1)
91 /* The following code assumes that gid_t and int32_t are the
92 same size. This is the case for al existing implementation.
93 If this should change some code needs to be added which
94 doesn't use memcpy but instead copies each array element one
96 assert (sizeof (int32_t) == sizeof (gid_t));
98 /* Make sure we have enough room. We always count GROUP in even
99 though we might not end up adding it. */
100 if (*size < initgr_resp->ngrps + 1)
102 gid_t *newp = realloc (*groupsp,
103 (initgr_resp->ngrps + 1) * sizeof (gid_t));
105 /* We cannot increase the buffer size. */
109 *size = initgr_resp->ngrps + 1;
112 if (respdata == NULL)
114 /* Read the data from the socket. */
115 if ((size_t) TEMP_FAILURE_RETRY (__read (sock, *groupsp,
118 == initgr_resp->ngrps * sizeof (gid_t))
119 retval = initgr_resp->ngrps;
123 /* Just copy the data. */
124 retval = initgr_resp->ngrps;
125 memcpy (*groupsp, respdata, retval * sizeof (gid_t));
128 /* Check whether GROUP is part of the mix. If not, add it. */
132 for (cnt = 0; cnt < retval; ++cnt)
133 if ((*groupsp)[cnt] == group)
137 (*groupsp)[retval++] = group;
142 /* The `errno' to some value != ERANGE. */
143 __set_errno (ENOENT);
144 /* Even though we have not found anything, the result is zero. */
149 close_not_cancel_no_status (sock);
151 if (__nscd_drop_map_ref (mapped, gc_cycle) != 0)
152 /* When we come here this means there has been a GC cycle while we
153 were looking for the data. This means the data might have been
154 inconsistent. Retry. */