1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2019, 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 https://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 ***************************************************************************/
22
23 #include "curl_setup.h"
24
25 /***********************************************************************
26 * Only for IPv6-enabled builds
27 **********************************************************************/
28 #ifdef CURLRES_IPV6
29
30 #ifdef HAVE_NETINET_IN_H
31 #include <netinet/in.h>
32 #endif
33 #ifdef HAVE_NETDB_H
34 #include <netdb.h>
35 #endif
36 #ifdef HAVE_ARPA_INET_H
37 #include <arpa/inet.h>
38 #endif
39 #ifdef __VMS
40 #include <in.h>
41 #include <inet.h>
42 #endif
43
44 #ifdef HAVE_PROCESS_H
45 #include <process.h>
46 #endif
47
48 #include "urldata.h"
49 #include "sendf.h"
50 #include "hostip.h"
51 #include "hash.h"
52 #include "share.h"
53 #include "strerror.h"
54 #include "url.h"
55 #include "inet_pton.h"
56 #include "connect.h"
57 /* The last 3 #include files should be in this order */
58 #include "curl_printf.h"
59 #include "curl_memory.h"
60 #include "memdebug.h"
61
62 /*
63 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
64 */
Curl_ipv6works(void)65 bool Curl_ipv6works(void)
66 {
67 /* the nature of most system is that IPv6 status doesn't come and go
68 during a program's lifetime so we only probe the first time and then we
69 have the info kept for fast re-use */
70 static int ipv6_works = -1;
71 if(-1 == ipv6_works) {
72 /* probe to see if we have a working IPv6 stack */
73 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
74 if(s == CURL_SOCKET_BAD)
75 /* an IPv6 address was requested but we can't get/use one */
76 ipv6_works = 0;
77 else {
78 ipv6_works = 1;
79 Curl_closesocket(NULL, s);
80 }
81 }
82 return (ipv6_works>0)?TRUE:FALSE;
83 }
84
85 /*
86 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
87 * been set and returns TRUE if they are OK.
88 */
Curl_ipvalid(struct connectdata * conn)89 bool Curl_ipvalid(struct connectdata *conn)
90 {
91 if(conn->ip_version == CURL_IPRESOLVE_V6)
92 return Curl_ipv6works();
93
94 return TRUE;
95 }
96
97 #if defined(CURLRES_SYNCH)
98
99 #ifdef DEBUG_ADDRINFO
dump_addrinfo(struct connectdata * conn,const Curl_addrinfo * ai)100 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
101 {
102 printf("dump_addrinfo:\n");
103 for(; ai; ai = ai->ai_next) {
104 char buf[INET6_ADDRSTRLEN];
105 char buffer[STRERROR_LEN];
106 printf(" fam %2d, CNAME %s, ",
107 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
108 if(Curl_printable_address(ai, buf, sizeof(buf)))
109 printf("%s\n", buf);
110 else
111 printf("failed; %s\n",
112 Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
113 }
114 }
115 #else
116 #define dump_addrinfo(x,y) Curl_nop_stmt
117 #endif
118
119 /*
120 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
121 * non-ares version).
122 *
123 * Returns name information about the given hostname and port number. If
124 * successful, the 'addrinfo' is returned and the forth argument will point to
125 * memory we need to free after use. That memory *MUST* be freed with
126 * Curl_freeaddrinfo(), nothing else.
127 */
Curl_getaddrinfo(struct connectdata * conn,const char * hostname,int port,int * waitp)128 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
129 const char *hostname,
130 int port,
131 int *waitp)
132 {
133 struct addrinfo hints;
134 Curl_addrinfo *res;
135 int error;
136 char sbuf[12];
137 char *sbufptr = NULL;
138 #ifndef USE_RESOLVE_ON_IPS
139 char addrbuf[128];
140 #endif
141 int pf;
142 #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
143 struct Curl_easy *data = conn->data;
144 #endif
145
146 *waitp = 0; /* synchronous response only */
147
148 /* Check if a limited name resolve has been requested */
149 switch(conn->ip_version) {
150 case CURL_IPRESOLVE_V4:
151 pf = PF_INET;
152 break;
153 case CURL_IPRESOLVE_V6:
154 pf = PF_INET6;
155 break;
156 default:
157 pf = PF_UNSPEC;
158 break;
159 }
160
161 if((pf != PF_INET) && !Curl_ipv6works())
162 /* The stack seems to be a non-IPv6 one */
163 pf = PF_INET;
164
165 memset(&hints, 0, sizeof(hints));
166 hints.ai_family = pf;
167 hints.ai_socktype = conn->socktype;
168
169 #ifndef USE_RESOLVE_ON_IPS
170 /*
171 * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
172 * an IPv4 address on iOS and Mac OS X.
173 */
174 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
175 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
176 /* the given address is numerical only, prevent a reverse lookup */
177 hints.ai_flags = AI_NUMERICHOST;
178 }
179 #endif
180
181 if(port) {
182 msnprintf(sbuf, sizeof(sbuf), "%d", port);
183 sbufptr = sbuf;
184 }
185
186 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
187 if(error) {
188 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
189 return NULL;
190 }
191
192 if(port) {
193 Curl_addrinfo_set_port(res, port);
194 }
195
196 dump_addrinfo(conn, res);
197
198 return res;
199 }
200 #endif /* CURLRES_SYNCH */
201
202 #endif /* CURLRES_IPV6 */
203