xref: /curl/lib/hostip6.c (revision f81f351b)
1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 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.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  * SPDX-License-Identifier: curl
22  *
23  ***************************************************************************/
24 
25 #include "curl_setup.h"
26 
27 /***********************************************************************
28  * Only for IPv6-enabled builds
29  **********************************************************************/
30 #ifdef CURLRES_IPV6
31 
32 #ifdef HAVE_NETINET_IN_H
33 #include <netinet/in.h>
34 #endif
35 #ifdef HAVE_NETDB_H
36 #include <netdb.h>
37 #endif
38 #ifdef HAVE_ARPA_INET_H
39 #include <arpa/inet.h>
40 #endif
41 #ifdef __VMS
42 #include <in.h>
43 #include <inet.h>
44 #endif
45 
46 #include "urldata.h"
47 #include "sendf.h"
48 #include "hostip.h"
49 #include "hash.h"
50 #include "share.h"
51 #include "url.h"
52 #include "inet_pton.h"
53 #include "connect.h"
54 /* The last 3 #include files should be in this order */
55 #include "curl_printf.h"
56 #include "curl_memory.h"
57 #include "memdebug.h"
58 
59 /*
60  * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
61  * been set and returns TRUE if they are OK.
62  */
Curl_ipvalid(struct Curl_easy * data,struct connectdata * conn)63 bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn)
64 {
65   if(conn->ip_version == CURL_IPRESOLVE_V6)
66     return Curl_ipv6works(data);
67 
68   return TRUE;
69 }
70 
71 #if defined(CURLRES_SYNCH)
72 
73 #ifdef DEBUG_ADDRINFO
dump_addrinfo(const struct Curl_addrinfo * ai)74 static void dump_addrinfo(const struct Curl_addrinfo *ai)
75 {
76   printf("dump_addrinfo:\n");
77   for(; ai; ai = ai->ai_next) {
78     char buf[INET6_ADDRSTRLEN];
79     printf("    fam %2d, CNAME %s, ",
80            ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
81     Curl_printable_address(ai, buf, sizeof(buf));
82     printf("%s\n", buf);
83   }
84 }
85 #else
86 #define dump_addrinfo(x) Curl_nop_stmt
87 #endif
88 
89 /*
90  * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
91  * non-ares version).
92  *
93  * Returns name information about the given hostname and port number. If
94  * successful, the 'addrinfo' is returned and the fourth argument will point
95  * to memory we need to free after use. That memory *MUST* be freed with
96  * Curl_freeaddrinfo(), nothing else.
97  */
Curl_getaddrinfo(struct Curl_easy * data,const char * hostname,int port,int * waitp)98 struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
99                                        const char *hostname,
100                                        int port,
101                                        int *waitp)
102 {
103   struct addrinfo hints;
104   struct Curl_addrinfo *res;
105   int error;
106   char sbuf[12];
107   char *sbufptr = NULL;
108 #ifndef USE_RESOLVE_ON_IPS
109   char addrbuf[128];
110 #endif
111   int pf = PF_INET;
112 
113   *waitp = 0; /* synchronous response only */
114 
115   if((data->conn->ip_version != CURL_IPRESOLVE_V4) && Curl_ipv6works(data))
116     /* The stack seems to be IPv6-enabled */
117     pf = PF_UNSPEC;
118 
119   memset(&hints, 0, sizeof(hints));
120   hints.ai_family = pf;
121   hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?
122     SOCK_STREAM : SOCK_DGRAM;
123 
124 #ifndef USE_RESOLVE_ON_IPS
125   /*
126    * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
127    * an IPv4 address on iOS and macOS.
128    */
129   if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
130      (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
131     /* the given address is numerical only, prevent a reverse lookup */
132     hints.ai_flags = AI_NUMERICHOST;
133   }
134 #endif
135 
136   if(port) {
137     msnprintf(sbuf, sizeof(sbuf), "%d", port);
138     sbufptr = sbuf;
139   }
140 
141   error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
142   if(error) {
143     infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);
144     return NULL;
145   }
146 
147   if(port) {
148     Curl_addrinfo_set_port(res, port);
149   }
150 
151   dump_addrinfo(res);
152 
153   return res;
154 }
155 #endif /* CURLRES_SYNCH */
156 
157 #endif /* CURLRES_IPV6 */
158