1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2016, 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 https://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"
52 #include "curl_printf.h"
53 #include "curl_memory.h"
55 /* The last #include file should be: */
58 /***********************************************************************
59 * Only for IPv6-enabled builds
60 **********************************************************************/
63 #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
64 /* These are strictly for memory tracing and are using the same style as the
65 * family otherwise present in memdebug.c. I put these ones here since they
66 * require a bunch of structs I didn't want to include in memdebug.c
70 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
71 * (ignoring the fact c-ares doesn't return 'serv').
74 int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
75 GETNAMEINFO_TYPE_ARG2 salen,
76 char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
77 char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
78 GETNAMEINFO_TYPE_ARG7 flags,
79 int line, const char *source)
81 int res = (getnameinfo)(sa, salen,
87 curl_memlog("GETNAME %s:%d getnameinfo()\n",
90 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
94 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
97 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
99 bool Curl_ipv6works(void)
101 /* the nature of most system is that IPv6 status doesn't come and go
102 during a program's lifetime so we only probe the first time and then we
103 have the info kept for fast re-use */
104 static int ipv6_works = -1;
105 if(-1 == ipv6_works) {
106 /* probe to see if we have a working IPv6 stack */
107 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
108 if(s == CURL_SOCKET_BAD)
109 /* an IPv6 address was requested but we can't get/use one */
113 Curl_closesocket(NULL, s);
116 return (ipv6_works>0)?TRUE:FALSE;
120 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
121 * been set and returns TRUE if they are OK.
123 bool Curl_ipvalid(struct connectdata *conn)
125 if(conn->ip_version == CURL_IPRESOLVE_V6)
126 return Curl_ipv6works();
131 #if defined(CURLRES_SYNCH)
133 #ifdef DEBUG_ADDRINFO
134 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
136 printf("dump_addrinfo:\n");
137 for(; ai; ai = ai->ai_next) {
138 char buf[INET6_ADDRSTRLEN];
140 printf(" fam %2d, CNAME %s, ",
141 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
142 if(Curl_printable_address(ai, buf, sizeof(buf)))
145 printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
149 #define dump_addrinfo(x,y) Curl_nop_stmt
153 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
156 * Returns name information about the given hostname and port number. If
157 * successful, the 'addrinfo' is returned and the forth argument will point to
158 * memory we need to free after use. That memory *MUST* be freed with
159 * Curl_freeaddrinfo(), nothing else.
161 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
162 const char *hostname,
166 struct addrinfo hints;
170 char *sbufptr = NULL;
173 #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
174 struct SessionHandle *data = conn->data;
177 *waitp = 0; /* synchronous response only */
179 /* Check if a limited name resolve has been requested */
180 switch(conn->ip_version) {
181 case CURL_IPRESOLVE_V4:
184 case CURL_IPRESOLVE_V6:
192 if((pf != PF_INET) && !Curl_ipv6works())
193 /* The stack seems to be a non-IPv6 one */
196 memset(&hints, 0, sizeof(hints));
197 hints.ai_family = pf;
198 hints.ai_socktype = conn->socktype;
200 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
201 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
202 /* the given address is numerical only, prevent a reverse lookup */
203 hints.ai_flags = AI_NUMERICHOST;
207 snprintf(sbuf, sizeof(sbuf), "%d", port);
211 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
213 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
217 dump_addrinfo(conn, res);
221 #endif /* CURLRES_SYNCH */
223 #endif /* CURLRES_IPV6 */