1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2017, 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 /* The last 3 #include files should be in this order */
53 #include "curl_printf.h"
54 #include "curl_memory.h"
57 /***********************************************************************
58 * Only for IPv6-enabled builds
59 **********************************************************************/
62 #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
63 /* These are strictly for memory tracing and are using the same style as the
64 * family otherwise present in memdebug.c. I put these ones here since they
65 * require a bunch of structs I didn't want to include in memdebug.c
69 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
70 * (ignoring the fact c-ares doesn't return 'serv').
73 int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
74 GETNAMEINFO_TYPE_ARG2 salen,
75 char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
76 char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
77 GETNAMEINFO_TYPE_ARG7 flags,
78 int line, const char *source)
80 int res = (getnameinfo)(sa, salen,
86 curl_memlog("GETNAME %s:%d getnameinfo()\n",
89 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
93 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
96 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
98 bool Curl_ipv6works(void)
100 /* the nature of most system is that IPv6 status doesn't come and go
101 during a program's lifetime so we only probe the first time and then we
102 have the info kept for fast re-use */
103 static int ipv6_works = -1;
104 if(-1 == ipv6_works) {
105 /* probe to see if we have a working IPv6 stack */
106 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
107 if(s == CURL_SOCKET_BAD)
108 /* an IPv6 address was requested but we can't get/use one */
112 Curl_closesocket(NULL, s);
115 return (ipv6_works>0)?TRUE:FALSE;
119 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
120 * been set and returns TRUE if they are OK.
122 bool Curl_ipvalid(struct connectdata *conn)
124 if(conn->ip_version == CURL_IPRESOLVE_V6)
125 return Curl_ipv6works();
130 #if defined(CURLRES_SYNCH)
132 #ifdef DEBUG_ADDRINFO
133 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
135 printf("dump_addrinfo:\n");
136 for(; ai; ai = ai->ai_next) {
137 char buf[INET6_ADDRSTRLEN];
139 printf(" fam %2d, CNAME %s, ",
140 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
141 if(Curl_printable_address(ai, buf, sizeof(buf)))
144 printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
148 #define dump_addrinfo(x,y) Curl_nop_stmt
152 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
155 * Returns name information about the given hostname and port number. If
156 * successful, the 'addrinfo' is returned and the forth argument will point to
157 * memory we need to free after use. That memory *MUST* be freed with
158 * Curl_freeaddrinfo(), nothing else.
160 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
161 const char *hostname,
165 struct addrinfo hints;
169 char *sbufptr = NULL;
170 #ifndef USE_RESOLVE_ON_IPS
174 #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
175 struct Curl_easy *data = conn->data;
178 *waitp = 0; /* synchronous response only */
180 /* Check if a limited name resolve has been requested */
181 switch(conn->ip_version) {
182 case CURL_IPRESOLVE_V4:
185 case CURL_IPRESOLVE_V6:
193 if((pf != PF_INET) && !Curl_ipv6works())
194 /* The stack seems to be a non-IPv6 one */
197 memset(&hints, 0, sizeof(hints));
198 hints.ai_family = pf;
199 hints.ai_socktype = conn->socktype;
201 #ifndef USE_RESOLVE_ON_IPS
203 * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
204 * an IPv4 address on iOS and Mac OS X.
206 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
207 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
208 /* the given address is numerical only, prevent a reverse lookup */
209 hints.ai_flags = AI_NUMERICHOST;
214 snprintf(sbuf, sizeof(sbuf), "%d", port);
218 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
220 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
225 Curl_addrinfo_set_port(res, port);
228 dump_addrinfo(conn, res);
232 #endif /* CURLRES_SYNCH */
234 #endif /* CURLRES_IPV6 */