1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2011, 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 ***************************************************************************/
27 #ifdef HAVE_SYS_SOCKET_H
28 #include <sys/socket.h>
30 #ifdef HAVE_NETINET_IN_H
31 #include <netinet/in.h>
36 #ifdef HAVE_ARPA_INET_H
37 #include <arpa/inet.h>
40 #include <stdlib.h> /* required for free() prototypes */
43 #include <unistd.h> /* for the close() proto */
62 #include "inet_pton.h"
65 #define _MPRINTF_REPLACE /* use our functions only */
66 #include <curl/mprintf.h>
68 #include "curl_memory.h"
69 /* The last #include file should be: */
72 /***********************************************************************
73 * Only for ipv6-enabled builds
74 **********************************************************************/
78 #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
79 /* These are strictly for memory tracing and are using the same style as the
80 * family otherwise present in memdebug.c. I put these ones here since they
81 * require a bunch of structs I didn't want to include in memdebug.c
85 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
86 * (ignoring the fact c-ares doesn't return 'serv').
89 int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
90 GETNAMEINFO_TYPE_ARG2 salen,
91 char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
92 char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
93 GETNAMEINFO_TYPE_ARG7 flags,
94 int line, const char *source)
96 int res = (getnameinfo)(sa, salen,
102 curl_memlog("GETNAME %s:%d getnameinfo()\n",
105 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
109 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
112 * Curl_ipv6works() returns TRUE if ipv6 seems to work.
114 bool Curl_ipv6works(void)
116 /* the nature of most system is that IPv6 status doesn't come and go
117 during a program's lifetime so we only probe the first time and then we
118 have the info kept for fast re-use */
119 static int ipv6_works = -1;
120 if(-1 == ipv6_works) {
121 /* probe to see if we have a working IPv6 stack */
122 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
123 if(s == CURL_SOCKET_BAD)
124 /* an ipv6 address was requested but we can't get/use one */
131 return (ipv6_works>0)?TRUE:FALSE;
135 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
136 * been set and returns TRUE if they are OK.
138 bool Curl_ipvalid(struct connectdata *conn)
140 if(conn->ip_version == CURL_IPRESOLVE_V6)
141 return Curl_ipv6works();
145 #if defined(CURLRES_SYNCH)
147 #ifdef DEBUG_ADDRINFO
148 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
150 printf("dump_addrinfo:\n");
151 for(; ai; ai = ai->ai_next) {
152 char buf[INET6_ADDRSTRLEN];
154 printf(" fam %2d, CNAME %s, ",
155 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
156 if(Curl_printable_address(ai, buf, sizeof(buf)))
159 printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
163 #define dump_addrinfo(x,y)
167 * Curl_getaddrinfo() when built ipv6-enabled (non-threading and
170 * Returns name information about the given hostname and port number. If
171 * successful, the 'addrinfo' is returned and the forth argument will point to
172 * memory we need to free after use. That memory *MUST* be freed with
173 * Curl_freeaddrinfo(), nothing else.
175 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
176 const char *hostname,
180 struct addrinfo hints;
183 char sbuf[NI_MAXSERV];
184 char *sbufptr = NULL;
187 struct SessionHandle *data = conn->data;
189 *waitp = 0; /* synchronous response only */
192 * Check if a limited name resolve has been requested.
194 switch(conn->ip_version) {
195 case CURL_IPRESOLVE_V4:
198 case CURL_IPRESOLVE_V6:
206 if((pf != PF_INET) && !Curl_ipv6works())
207 /* the stack seems to be a non-ipv6 one */
210 memset(&hints, 0, sizeof(hints));
211 hints.ai_family = pf;
212 hints.ai_socktype = conn->socktype;
214 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
215 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
216 /* the given address is numerical only, prevent a reverse lookup */
217 hints.ai_flags = AI_NUMERICHOST;
221 snprintf(sbuf, sizeof(sbuf), "%d", port);
224 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
226 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
230 dump_addrinfo(conn, res);
234 #endif /* CURLRES_SYNCH */
235 #endif /* CURLRES_IPV6 */