1 /* Copyright (C) 2004, 2005 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 /* Define in nscd_gethst_r.c. */
33 extern int __nss_not_use_nscd_hosts;
36 /* We use the mapping from nscd_gethst. */
37 libc_locked_map_ptr (extern, __hst_map_handle);
41 __nscd_getai (const char *key, struct nscd_ai_result **result, int *h_errnop)
43 size_t keylen = strlen (key) + 1;
46 /* If the mapping is available, try to search there instead of
47 communicating with the nscd. */
48 struct mapped_database *mapped;
49 mapped = __nscd_get_map_ref (GETFDHST, "hosts", &__hst_map_handle,
53 const ai_response_header *ai_resp = NULL;
54 struct nscd_ai_result *resultbuf = NULL;
55 const char *recend = (const char *) ~UINTMAX_C (0);
56 char *respdata = NULL;
60 if (mapped != NO_MAPPING)
62 const struct datahead *found = __nscd_cache_search (GETAI, key, keylen,
66 ai_resp = &found->data[0].aidata;
67 respdata = (char *) (ai_resp + 1);
68 recend = (const char *) found->data + found->recsize;
72 /* If we do not have the cache mapped, try to get the data over the
74 ai_response_header ai_resp_mem;
77 sock = __nscd_open_socket (key, keylen, GETAI, &ai_resp_mem,
78 sizeof (ai_resp_mem));
81 /* nscd not running or wrong version. */
82 __nss_not_use_nscd_hosts = 1;
86 ai_resp = &ai_resp_mem;
89 if (ai_resp->found == 1)
91 size_t datalen = ai_resp->naddrs + ai_resp->addrslen + ai_resp->canonlen;
93 /* This check is really only affects the case where the data
94 comes from the mapped cache. */
95 if ((char *) (ai_resp + 1) + datalen > recend)
102 resultbuf = (struct nscd_ai_result *) malloc (sizeof (*resultbuf)
104 if (resultbuf == NULL)
106 *h_errnop = NETDB_INTERNAL;
110 /* Set up the data structure, including pointers. */
111 resultbuf->naddrs = ai_resp->naddrs;
112 resultbuf->addrs = (char *) (resultbuf + 1);
113 resultbuf->family = (uint8_t *) (resultbuf->addrs + ai_resp->addrslen);
114 if (ai_resp->canonlen != 0)
115 resultbuf->canon = (char *) (resultbuf->family + resultbuf->naddrs);
117 resultbuf->canon = NULL;
119 if (respdata == NULL)
121 /* Read the data from the socket. */
122 if ((size_t) __readall (sock, resultbuf + 1, datalen) == datalen)
130 *h_errnop = NETDB_INTERNAL;
135 /* Copy the data in the block. */
136 memcpy (resultbuf + 1, respdata, datalen);
138 /* Try to detect corrupt databases. */
139 if (resultbuf->canon != NULL
140 && resultbuf->canon[ai_resp->canonlen - 1] != '\0')
141 /* We cannot use the database. */
153 if (__builtin_expect (ai_resp->found == -1, 0))
155 /* The daemon does not cache this database. */
156 __nss_not_use_nscd_hosts = 1;
160 /* Store the error number. */
161 *h_errnop = ai_resp->error;
163 /* The `errno' to some value != ERANGE. */
164 __set_errno (ENOENT);
165 /* Even though we have not found anything, the result is zero. */
171 close_not_cancel_no_status (sock);
173 if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0 && retval != -1)
175 /* When we come here this means there has been a GC cycle while we
176 were looking for the data. This means the data might have been
177 inconsistent. Retry if possible. */
178 if ((gc_cycle & 1) != 0)
180 /* nscd is just running gc now. Disable using the mapping. */
181 __nscd_unmap (mapped);