1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2014, 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.
21 ***************************************************************************/
23 #include "curl_setup.h"
25 #ifdef HAVE_NETINET_IN_H
26 #include <netinet/in.h>
31 #ifdef HAVE_ARPA_INET_H
32 #include <arpa/inet.h>
50 #include "inet_pton.h"
53 #define _MPRINTF_REPLACE /* use our functions only */
54 #include <curl/mprintf.h>
56 #include "curl_memory.h"
57 /* The last #include file should be: */
60 /***********************************************************************
61 * Only for IPv6-enabled builds
62 **********************************************************************/
66 #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
67 /* These are strictly for memory tracing and are using the same style as the
68 * family otherwise present in memdebug.c. I put these ones here since they
69 * require a bunch of structs I didn't want to include in memdebug.c
73 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
74 * (ignoring the fact c-ares doesn't return 'serv').
77 int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
78 GETNAMEINFO_TYPE_ARG2 salen,
79 char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
80 char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
81 GETNAMEINFO_TYPE_ARG7 flags,
82 int line, const char *source)
84 int res = (getnameinfo)(sa, salen,
90 curl_memlog("GETNAME %s:%d getnameinfo()\n",
93 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
97 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
100 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
102 bool Curl_ipv6works(void)
104 /* the nature of most system is that IPv6 status doesn't come and go
105 during a program's lifetime so we only probe the first time and then we
106 have the info kept for fast re-use */
107 static int ipv6_works = -1;
108 if(-1 == ipv6_works) {
109 /* probe to see if we have a working IPv6 stack */
110 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
111 if(s == CURL_SOCKET_BAD)
112 /* an IPv6 address was requested but we can't get/use one */
116 Curl_closesocket(NULL, s);
119 return (ipv6_works>0)?TRUE:FALSE;
123 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
124 * been set and returns TRUE if they are OK.
126 bool Curl_ipvalid(struct connectdata *conn)
128 if(conn->ip_version == CURL_IPRESOLVE_V6)
129 return Curl_ipv6works();
133 #if defined(CURLRES_SYNCH)
135 #ifdef DEBUG_ADDRINFO
136 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
138 printf("dump_addrinfo:\n");
139 for(; ai; ai = ai->ai_next) {
140 char buf[INET6_ADDRSTRLEN];
142 printf(" fam %2d, CNAME %s, ",
143 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
144 if(Curl_printable_address(ai, buf, sizeof(buf)))
147 printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
151 #define dump_addrinfo(x,y) Curl_nop_stmt
155 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
158 * Returns name information about the given hostname and port number. If
159 * successful, the 'addrinfo' is returned and the forth argument will point to
160 * memory we need to free after use. That memory *MUST* be freed with
161 * Curl_freeaddrinfo(), nothing else.
163 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
164 const char *hostname,
168 struct addrinfo hints;
172 char *sbufptr = NULL;
175 struct SessionHandle *data = conn->data;
177 *waitp = 0; /* synchronous response only */
180 * Check if a limited name resolve has been requested.
182 switch(conn->ip_version) {
183 case CURL_IPRESOLVE_V4:
186 case CURL_IPRESOLVE_V6:
194 if((pf != PF_INET) && !Curl_ipv6works())
195 /* The stack seems to be a non-IPv6 one */
198 memset(&hints, 0, sizeof(hints));
199 hints.ai_family = pf;
200 hints.ai_socktype = conn->socktype;
202 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
203 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
204 /* the given address is numerical only, prevent a reverse lookup */
205 hints.ai_flags = AI_NUMERICHOST;
209 snprintf(sbuf, sizeof(sbuf), "%d", port);
212 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
214 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
218 dump_addrinfo(conn, res);
222 #endif /* CURLRES_SYNCH */
223 #endif /* CURLRES_IPV6 */