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)
38 if (map_handle.mapped != NO_MAPPING)
39 free (map_handle.mapped);
44 __nscd_getgrouplist (const char *user, gid_t group, long int *size,
45 gid_t **groupsp, long int limit)
47 size_t userlen = strlen (user) + 1;
50 /* If the mapping is available, try to search there instead of
51 communicating with the nscd. */
52 struct mapped_database *mapped;
53 mapped = __nscd_get_map_ref (GETFDGR, "group", &map_handle, &gc_cycle);
56 const initgr_response_header *initgr_resp = NULL;
57 char *respdata = NULL;
61 if (mapped != NO_MAPPING)
63 const struct datahead *found = __nscd_cache_search (INITGROUPS, user,
67 initgr_resp = &found->data[0].initgrdata;
68 respdata = (char *) (initgr_resp + 1);
69 char *recend = (char *) found->data + found->recsize;
71 if (respdata + initgr_resp->ngrps * sizeof (int32_t) > recend)
76 /* If we do not have the cache mapped, try to get the data over the
78 initgr_response_header initgr_resp_mem;
79 if (initgr_resp == NULL)
81 sock = __nscd_open_socket (user, userlen, INITGROUPS, &initgr_resp_mem,
82 sizeof (initgr_resp_mem));
84 /* nscd not running or wrong version or hosts caching disabled. */
85 __nss_not_use_nscd_group = 1;
87 initgr_resp = &initgr_resp_mem;
90 if (initgr_resp->found == 1)
92 /* The following code assumes that gid_t and int32_t are the
93 same size. This is the case for al existing implementation.
94 If this should change some code needs to be added which
95 doesn't use memcpy but instead copies each array element one
97 assert (sizeof (int32_t) == sizeof (gid_t));
98 assert (initgr_resp->ngrps > 0);
100 /* Make sure we have enough room. We always count GROUP in even
101 though we might not end up adding it. */
102 if (*size < initgr_resp->ngrps + 1)
104 gid_t *newp = realloc (*groupsp,
105 (initgr_resp->ngrps + 1) * sizeof (gid_t));
107 /* We cannot increase the buffer size. */
111 *size = initgr_resp->ngrps + 1;
114 if (respdata == NULL)
116 /* Read the data from the socket. */
117 if ((size_t) TEMP_FAILURE_RETRY (__read (sock, *groupsp,
120 == initgr_resp->ngrps * sizeof (gid_t))
121 retval = initgr_resp->ngrps;
125 /* Just copy the data. */
126 retval = initgr_resp->ngrps;
127 memcpy (*groupsp, respdata, retval * sizeof (gid_t));
131 /* No group found yet. */
134 /* Check whether GROUP is part of the mix. If not, add it. */
138 for (cnt = 0; cnt < retval; ++cnt)
139 if ((*groupsp)[cnt] == group)
143 (*groupsp)[retval++] = group;
147 close_not_cancel_no_status (sock);
149 if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0 && retval != -1)
151 /* When we come here this means there has been a GC cycle while we
152 were looking for the data. This means the data might have been
153 inconsistent. Retry if possible. */
154 if ((gc_cycle & 1) != 0)
156 /* nscd is just running gc now. Disable using the mapping. */
157 __nscd_unmap (mapped);