1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2015, 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 http://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 #ifdef HAVE_NETINET_IN_H
26 #include <netinet/in.h>
27 #endif
28 #ifdef HAVE_NETDB_H
29 #include <netdb.h>
30 #endif
31 #ifdef HAVE_ARPA_INET_H
32 #include <arpa/inet.h>
33 #endif
34 #ifdef __VMS
35 #include <in.h>
36 #include <inet.h>
37 #endif
38
39 #ifdef HAVE_PROCESS_H
40 #include <process.h>
41 #endif
42
43 #include "urldata.h"
44 #include "sendf.h"
45 #include "hostip.h"
46 #include "hash.h"
47 #include "share.h"
48 #include "strerror.h"
49 #include "url.h"
50 #include "inet_pton.h"
51 #include "connect.h"
52 #include "curl_printf.h"
53 #include "curl_memory.h"
54 /* The last #include file should be: */
55 #include "memdebug.h"
56
57 /***********************************************************************
58 * Only for IPv6-enabled builds
59 **********************************************************************/
60 #ifdef CURLRES_IPV6
61
62
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
67 */
68
69 /*
70 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
71 * (ignoring the fact c-ares doesn't return 'serv').
72 */
73
curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,GETNAMEINFO_TYPE_ARG2 salen,char * host,GETNAMEINFO_TYPE_ARG46 hostlen,char * serv,GETNAMEINFO_TYPE_ARG46 servlen,GETNAMEINFO_TYPE_ARG7 flags,int line,const char * source)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)
80 {
81 int res = (getnameinfo)(sa, salen,
82 host, hostlen,
83 serv, servlen,
84 flags);
85 if(0 == res)
86 /* success */
87 curl_memlog("GETNAME %s:%d getnameinfo()\n",
88 source, line);
89 else
90 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
91 source, line, res);
92 return res;
93 }
94 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
95
96 /*
97 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
98 */
Curl_ipv6works(void)99 bool Curl_ipv6works(void)
100 {
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 */
110 ipv6_works = 0;
111 else {
112 ipv6_works = 1;
113 Curl_closesocket(NULL, s);
114 }
115 }
116 return (ipv6_works>0)?TRUE:FALSE;
117 }
118
119 /*
120 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
121 * been set and returns TRUE if they are OK.
122 */
Curl_ipvalid(struct connectdata * conn)123 bool Curl_ipvalid(struct connectdata *conn)
124 {
125 if(conn->ip_version == CURL_IPRESOLVE_V6)
126 return Curl_ipv6works();
127 return TRUE;
128 }
129
130 #if defined(CURLRES_SYNCH)
131
132 #ifdef DEBUG_ADDRINFO
dump_addrinfo(struct connectdata * conn,const Curl_addrinfo * ai)133 static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
134 {
135 printf("dump_addrinfo:\n");
136 for(; ai; ai = ai->ai_next) {
137 char buf[INET6_ADDRSTRLEN];
138
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)))
142 printf("%s\n", buf);
143 else
144 printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
145 }
146 }
147 #else
148 #define dump_addrinfo(x,y) Curl_nop_stmt
149 #endif
150
151 /*
152 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
153 * non-ares version).
154 *
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.
159 */
Curl_getaddrinfo(struct connectdata * conn,const char * hostname,int port,int * waitp)160 Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
161 const char *hostname,
162 int port,
163 int *waitp)
164 {
165 struct addrinfo hints;
166 Curl_addrinfo *res;
167 int error;
168 char sbuf[12];
169 char *sbufptr = NULL;
170 char addrbuf[128];
171 int pf;
172 struct SessionHandle *data = conn->data;
173
174 *waitp = 0; /* synchronous response only */
175
176 /*
177 * Check if a limited name resolve has been requested.
178 */
179 switch(conn->ip_version) {
180 case CURL_IPRESOLVE_V4:
181 pf = PF_INET;
182 break;
183 case CURL_IPRESOLVE_V6:
184 pf = PF_INET6;
185 break;
186 default:
187 pf = PF_UNSPEC;
188 break;
189 }
190
191 if((pf != PF_INET) && !Curl_ipv6works())
192 /* The stack seems to be a non-IPv6 one */
193 pf = PF_INET;
194
195 memset(&hints, 0, sizeof(hints));
196 hints.ai_family = pf;
197 hints.ai_socktype = conn->socktype;
198
199 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
200 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
201 /* the given address is numerical only, prevent a reverse lookup */
202 hints.ai_flags = AI_NUMERICHOST;
203 }
204
205 if(port) {
206 snprintf(sbuf, sizeof(sbuf), "%d", port);
207 sbufptr=sbuf;
208 }
209 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
210 if(error) {
211 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
212 return NULL;
213 }
214
215 dump_addrinfo(conn, res);
216
217 return res;
218 }
219 #endif /* CURLRES_SYNCH */
220 #endif /* CURLRES_IPV6 */
221
222