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 */
63bool 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
74static void dump_addrinfo(struct connectdata *conn,
75 const struct Curl_addrinfo *ai)
76{
77 printf("dump_addrinfo:\n");
78 for(; ai; ai = ai->ai_next) {
79 char buf[INET6_ADDRSTRLEN];
80 printf(" fam %2d, CNAME %s, ",
81 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
82 Curl_printable_address(ai, buf, sizeof(buf));
83 printf("%s\n", buf);
84 }
85}
86#else
87#define dump_addrinfo(x,y) Curl_nop_stmt
88#endif
89
90/*
91 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
92 * non-ares version).
93 *
94 * Returns name information about the given hostname and port number. If
95 * successful, the 'addrinfo' is returned and the fourth argument will point
96 * to memory we need to free after use. That memory *MUST* be freed with
97 * Curl_freeaddrinfo(), nothing else.
98 */
99struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
100 const char *hostname,
101 int port,
102 int *waitp)
103{
104 struct addrinfo hints;
105 struct Curl_addrinfo *res;
106 int error;
107 char sbuf[12];
108 char *sbufptr = NULL;
109#ifndef USE_RESOLVE_ON_IPS
110 char addrbuf[128];
111#endif
112 int pf = PF_INET;
113
114 *waitp = 0; /* synchronous response only */
115
116 if((data->conn->ip_version != CURL_IPRESOLVE_V4) && Curl_ipv6works(data))
117 /* The stack seems to be IPv6-enabled */
118 pf = PF_UNSPEC;
119
120 memset(&hints, 0, sizeof(hints));
121 hints.ai_family = pf;
122 hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?
123 SOCK_STREAM : SOCK_DGRAM;
124
125#ifndef USE_RESOLVE_ON_IPS
126 /*
127 * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
128 * an IPv4 address on iOS and Mac OS X.
129 */
130 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
131 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
132 /* the given address is numerical only, prevent a reverse lookup */
133 hints.ai_flags = AI_NUMERICHOST;
134 }
135#endif
136
137 if(port) {
138 msnprintf(sbuf, sizeof(sbuf), "%d", port);
139 sbufptr = sbuf;
140 }
141
142 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
143 if(error) {
144 infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);
145 return NULL;
146 }
147
148 if(port) {
149 Curl_addrinfo_set_port(res, port);
150 }
151
152 dump_addrinfo(conn, res);
153
154 return res;
155}
156#endif /* CURLRES_SYNCH */
157
158#endif /* CURLRES_IPV6 */
159