1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
22 ***************************************************************************/
31 #ifdef HAVE_SYS_SOCKET_H
32 #include <sys/socket.h>
34 #ifdef HAVE_NETINET_IN_H
35 #include <netinet/in.h>
40 #ifdef HAVE_ARPA_INET_H
41 #include <arpa/inet.h>
44 #include <stdlib.h> /* required for free() prototypes */
47 #include <unistd.h> /* for the close() proto */
71 #define _MPRINTF_REPLACE /* use our functions only */
72 #include <curl/mprintf.h>
74 #if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
75 #include "inet_ntoa_r.h"
79 /* The last #include file should be: */
82 /***********************************************************************
83 * Only for builds using asynchronous name resolves
84 **********************************************************************/
87 * addrinfo_callback() gets called by ares, gethostbyname_thread() or
88 * getaddrinfo_thread() when we got the name resolved (or not!).
90 * If the status argument is CURL_ASYNC_SUCCESS, we might need to copy the
91 * address field since it might be freed when this function returns. This
92 * operation stores the resolved data in the DNS cache.
94 * NOTE: for IPv6 operations, Curl_addrinfo_copy() returns the same
95 * pointer it is given as argument!
97 * The storage operation locks and unlocks the DNS cache.
99 static CURLcode addrinfo_callback(void *arg, /* "struct connectdata *" */
103 struct connectdata *conn = (struct connectdata *)arg;
104 struct Curl_dns_entry *dns = NULL;
105 CURLcode rc = CURLE_OK;
107 conn->async.status = status;
109 if(CURL_ASYNC_SUCCESS == status) {
112 * IPv4/ares: Curl_addrinfo_copy() copies the address and returns an
115 * IPv6: Curl_addrinfo_copy() returns the input pointer!
117 Curl_addrinfo *ai = Curl_addrinfo_copy(addr, conn->async.port);
119 struct SessionHandle *data = conn->data;
122 Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
124 dns = Curl_cache_addr(data, ai,
125 conn->async.hostname,
128 /* failed to store, cleanup and return error */
129 Curl_freeaddrinfo(ai);
130 rc = CURLE_OUT_OF_MEMORY;
134 Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
137 rc = CURLE_OUT_OF_MEMORY;
140 conn->async.dns = dns;
142 /* Set async.done TRUE last in this function since it may be used multi-
143 threaded and once this is TRUE the other thread may read fields from the
145 conn->async.done = TRUE;
147 /* ipv4: The input hostent struct will be freed by ares when we return from
152 CURLcode Curl_addrinfo4_callback(void *arg, /* "struct connectdata *" */
154 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
157 struct hostent *hostent)
159 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
160 (void)timeouts; /* ignored */
162 return addrinfo_callback(arg, status, hostent);
166 CURLcode Curl_addrinfo6_callback(void *arg, /* "struct connectdata *" */
168 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
173 /* NOTE: for CURLRES_ARES, the 'ai' argument is really a
174 * 'struct hostent' pointer.
176 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
177 (void)timeouts; /* ignored */
179 return addrinfo_callback(arg, status, ai);
183 #endif /* CURLRES_ASYNC */