1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, 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 ***************************************************************************/
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 "url.h"
54#include "inet_pton.h"
55#include "connect.h"
56/* The last 3 #include files should be in this order */
57#include "curl_printf.h"
58#include "curl_memory.h"
59#include "memdebug.h"
60
61/*
62 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
63 * been set and returns TRUE if they are OK.
64 */
65bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn)
66{
67 if(conn->ip_version == CURL_IPRESOLVE_V6)
68 return Curl_ipv6works(data);
69
70 return TRUE;
71}
72
73#if defined(CURLRES_SYNCH)
74
75#ifdef DEBUG_ADDRINFO
76static void dump_addrinfo(struct connectdata *conn,
77 const struct Curl_addrinfo *ai)
78{
79 printf("dump_addrinfo:\n");
80 for(; ai; ai = ai->ai_next) {
81 char buf[INET6_ADDRSTRLEN];
82 printf(" fam %2d, CNAME %s, ",
83 ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
84 Curl_printable_address(ai, buf, sizeof(buf));
85 printf("%s\n", buf);
86 }
87}
88#else
89#define dump_addrinfo(x,y) Curl_nop_stmt
90#endif
91
92/*
93 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
94 * non-ares version).
95 *
96 * Returns name information about the given hostname and port number. If
97 * successful, the 'addrinfo' is returned and the forth argument will point to
98 * memory we need to free after use. That memory *MUST* be freed with
99 * Curl_freeaddrinfo(), nothing else.
100 */
101struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
102 const char *hostname,
103 int port,
104 int *waitp)
105{
106 struct addrinfo hints;
107 struct Curl_addrinfo *res;
108 int error;
109 char sbuf[12];
110 char *sbufptr = NULL;
111#ifndef USE_RESOLVE_ON_IPS
112 char addrbuf[128];
113#endif
114 int pf = PF_INET;
115
116 *waitp = 0; /* synchronous response only */
117
118 if(Curl_ipv6works(data))
119 /* The stack seems to be IPv6-enabled */
120 pf = PF_UNSPEC;
121
122 memset(&hints, 0, sizeof(hints));
123 hints.ai_family = pf;
124 hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?
125 SOCK_STREAM : SOCK_DGRAM;
126
127#ifndef USE_RESOLVE_ON_IPS
128 /*
129 * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
130 * an IPv4 address on iOS and Mac OS X.
131 */
132 if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
133 (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
134 /* the given address is numerical only, prevent a reverse lookup */
135 hints.ai_flags = AI_NUMERICHOST;
136 }
137#endif
138
139 if(port) {
140 msnprintf(sbuf, sizeof(sbuf), "%d", port);
141 sbufptr = sbuf;
142 }
143
144 error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
145 if(error) {
146 infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);
147 return NULL;
148 }
149
150 if(port) {
151 Curl_addrinfo_set_port(res, port);
152 }
153
154 dump_addrinfo(conn, res);
155
156 return res;
157}
158#endif /* CURLRES_SYNCH */
159
160#endif /* CURLRES_IPV6 */
161