1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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 #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 /* The last 3 #include files should be in this order */
53 #include "curl_printf.h"
54 #include "curl_memory.h"
55 #include "memdebug.h"
56
57 /***********************************************************************
58 * Only for IPv6-enabled builds
59 **********************************************************************/
60 #ifdef CURLRES_IPV6
61
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
66 */
67
68 /*
69 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
70 * (ignoring the fact c-ares doesn't return 'serv').
71 */
72
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)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)
79 {
80 int res = (getnameinfo)(sa, salen,
81 host, hostlen,
82 serv, servlen,
83 flags);
84 if(0 == res)
85 /* success */
86 curl_memlog("GETNAME %s:%d getnameinfo()\n",
87 source, line);
88 else
89 curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
90 source, line, res);
91 return res;
92 }
93 #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
94
95 /*
96 * Curl_ipv6works() returns TRUE if IPv6 seems to work.
97 */
Curl_ipv6works(void)98 bool Curl_ipv6works(void)
99 {
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 */
109 ipv6_works = 0;
110 else {
111 ipv6_works = 1;
112 Curl_closesocket(NULL, s);
113 }
114 }
115 return (ipv6_works>0)?TRUE:FALSE;
116 }
117
118 /*
119 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
120 * been set and returns TRUE if they are OK.
121 */
Curl_ipvalid(struct connectdata * conn)122 bool Curl_ipvalid(struct connectdata *conn)
123 {
124 if(conn->ip_version == CURL_IPRESOLVE_V6)
125 return Curl_ipv6works();
126
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 #ifndef USE_RESOLVE_ON_IPS
171 char addrbuf[128];
172 #endif
173 int pf;
174 #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
175 struct Curl_easy *data = conn->data;
176 #endif
177
178 *waitp = 0; /* synchronous response only */
179
180 /* Check if a limited name resolve has been requested */
181 switch(conn->ip_version) {
182 case CURL_IPRESOLVE_V4:
183 pf = PF_INET;
184 break;
185 case CURL_IPRESOLVE_V6:
186 pf = PF_INET6;
187 break;
188 default:
189 pf = PF_UNSPEC;
190 break;
191 }
192
193 if((pf != PF_INET) && !Curl_ipv6works())
194 /* The stack seems to be a non-IPv6 one */
195 pf = PF_INET;
196
197 memset(&hints, 0, sizeof(hints));
198 hints.ai_family = pf;
199 hints.ai_socktype = conn->socktype;
200
201 #ifndef USE_RESOLVE_ON_IPS
202 /*
203 * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
204 * an IPv4 address on iOS and Mac OS X.
205 */
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;
210 }
211 #endif
212
213 if(port) {
214 snprintf(sbuf, sizeof(sbuf), "%d", port);
215 sbufptr=sbuf;
216 }
217
218 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
219 if(error) {
220 infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
221 return NULL;
222 }
223
224 if(port) {
225 Curl_addrinfo_set_port(res, port);
226 }
227
228 dump_addrinfo(conn, res);
229
230 return res;
231 }
232 #endif /* CURLRES_SYNCH */
233
234 #endif /* CURLRES_IPV6 */
235