1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
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.
13 *
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.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * $Id: hostasyn.c,v 1.22 2008-10-30 13:45:25 yangtse Exp $
22 ***************************************************************************/
23
24 #include "setup.h"
25
26 #include <string.h>
27
28 #ifdef NEED_MALLOC_H
29 #include <malloc.h>
30 #endif
31 #ifdef HAVE_SYS_SOCKET_H
32 #include <sys/socket.h>
33 #endif
34 #ifdef HAVE_NETINET_IN_H
35 #include <netinet/in.h>
36 #endif
37 #ifdef HAVE_NETDB_H
38 #include <netdb.h>
39 #endif
40 #ifdef HAVE_ARPA_INET_H
41 #include <arpa/inet.h>
42 #endif
43 #ifdef HAVE_STDLIB_H
44 #include <stdlib.h> /* required for free() prototypes */
45 #endif
46 #ifdef HAVE_UNISTD_H
47 #include <unistd.h> /* for the close() proto */
48 #endif
49 #ifdef VMS
50 #include <in.h>
51 #include <inet.h>
52 #include <stdlib.h>
53 #endif
54
55 #ifdef HAVE_PROCESS_H
56 #include <process.h>
57 #endif
58
59 #include "urldata.h"
60 #include "sendf.h"
61 #include "hostip.h"
62 #include "hash.h"
63 #include "share.h"
64 #include "strerror.h"
65 #include "url.h"
66
67 #define _MPRINTF_REPLACE /* use our functions only */
68 #include <curl/mprintf.h>
69
70 #include "memory.h"
71 /* The last #include file should be: */
72 #include "memdebug.h"
73
74 /***********************************************************************
75 * Only for builds using asynchronous name resolves
76 **********************************************************************/
77 #ifdef CURLRES_ASYNCH
78 /*
79 * addrinfo_callback() gets called by ares, gethostbyname_thread() or
80 * getaddrinfo_thread() when we got the name resolved (or not!).
81 *
82 * If the status argument is CURL_ASYNC_SUCCESS, we might need to copy the
83 * address field since it might be freed when this function returns. This
84 * operation stores the resolved data in the DNS cache.
85 *
86 * NOTE: for IPv6 operations, Curl_addrinfo_copy() returns the same
87 * pointer it is given as argument!
88 *
89 * The storage operation locks and unlocks the DNS cache.
90 */
addrinfo_callback(void * arg,int status,void * addr)91 static CURLcode addrinfo_callback(void *arg, /* "struct connectdata *" */
92 int status,
93 void *addr)
94 {
95 struct connectdata *conn = (struct connectdata *)arg;
96 struct Curl_dns_entry *dns = NULL;
97 CURLcode rc = CURLE_OK;
98
99 conn->async.status = status;
100
101 if(CURL_ASYNC_SUCCESS == status) {
102
103 /*
104 * IPv4/ares: Curl_addrinfo_copy() copies the address and returns an
105 * allocated version.
106 *
107 * IPv6: Curl_addrinfo_copy() returns the input pointer!
108 */
109 Curl_addrinfo *ai = Curl_addrinfo_copy(addr, conn->async.port);
110 if(ai) {
111 struct SessionHandle *data = conn->data;
112
113 if(data->share)
114 Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
115
116 dns = Curl_cache_addr(data, ai,
117 conn->async.hostname,
118 conn->async.port);
119 if(!dns) {
120 /* failed to store, cleanup and return error */
121 Curl_freeaddrinfo(ai);
122 rc = CURLE_OUT_OF_MEMORY;
123 }
124
125 if(data->share)
126 Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
127 }
128 else
129 rc = CURLE_OUT_OF_MEMORY;
130 }
131
132 conn->async.dns = dns;
133
134 /* Set async.done TRUE last in this function since it may be used multi-
135 threaded and once this is TRUE the other thread may read fields from the
136 async struct */
137 conn->async.done = TRUE;
138
139 /* ipv4: The input hostent struct will be freed by ares when we return from
140 this function */
141 return rc;
142 }
143
Curl_addrinfo4_callback(void * arg,int status,int timeouts,struct hostent * hostent)144 CURLcode Curl_addrinfo4_callback(void *arg, /* "struct connectdata *" */
145 int status,
146 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
147 int timeouts,
148 #endif
149 struct hostent *hostent)
150 {
151 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
152 (void)timeouts; /* ignored */
153 #endif
154 return addrinfo_callback(arg, status, hostent);
155 }
156
157 #ifdef CURLRES_IPV6
Curl_addrinfo6_callback(void * arg,int status,int timeouts,Curl_addrinfo * ai)158 CURLcode Curl_addrinfo6_callback(void *arg, /* "struct connectdata *" */
159 int status,
160 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
161 int timeouts,
162 #endif
163 Curl_addrinfo *ai)
164 {
165 /* NOTE: for CURLRES_ARES, the 'ai' argument is really a
166 * 'struct hostent' pointer.
167 */
168 #ifdef HAVE_CARES_CALLBACK_TIMEOUTS
169 (void)timeouts; /* ignored */
170 #endif
171 return addrinfo_callback(arg, status, ai);
172 }
173 #endif
174
175 #endif /* CURLRES_ASYNC */
176