aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/curl/lib/hostip6.c
blob: d9868628c31bd6fee8329e6d5d2376071fdad4b5 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/

#include "curl_setup.h"

/***********************************************************************
 * Only for IPv6-enabled builds
 **********************************************************************/
#ifdef CURLRES_IPV6

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef __VMS
#include <in.h>
#include <inet.h>
#endif

#ifdef HAVE_PROCESS_H
#include <process.h>
#endif

#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "url.h"
#include "inet_pton.h"
#include "connect.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"

/*
 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
 * been set and returns TRUE if they are OK.
 */
bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn)
{
  if(conn->ip_version == CURL_IPRESOLVE_V6)
    return Curl_ipv6works(data);

  return TRUE;
}

#if defined(CURLRES_SYNCH)

#ifdef DEBUG_ADDRINFO
static void dump_addrinfo(struct connectdata *conn,
                          const struct Curl_addrinfo *ai)
{
  printf("dump_addrinfo:\n");
  for(; ai; ai = ai->ai_next) {
    char buf[INET6_ADDRSTRLEN];
    printf("    fam %2d, CNAME %s, ",
           ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
    Curl_printable_address(ai, buf, sizeof(buf));
    printf("%s\n", buf);
  }
}
#else
#define dump_addrinfo(x,y) Curl_nop_stmt
#endif

/*
 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
 * non-ares version).
 *
 * Returns name information about the given hostname and port number. If
 * successful, the 'addrinfo' is returned and the forth argument will point to
 * memory we need to free after use. That memory *MUST* be freed with
 * Curl_freeaddrinfo(), nothing else.
 */
struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
                                       const char *hostname,
                                       int port,
                                       int *waitp)
{
  struct addrinfo hints;
  struct Curl_addrinfo *res;
  int error;
  char sbuf[12];
  char *sbufptr = NULL;
#ifndef USE_RESOLVE_ON_IPS
  char addrbuf[128];
#endif
  int pf = PF_INET;

  *waitp = 0; /* synchronous response only */

  if(Curl_ipv6works(data))
    /* The stack seems to be IPv6-enabled */
    pf = PF_UNSPEC;

  memset(&hints, 0, sizeof(hints));
  hints.ai_family = pf;
  hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?
    SOCK_STREAM : SOCK_DGRAM;

#ifndef USE_RESOLVE_ON_IPS
  /*
   * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
   * an IPv4 address on iOS and Mac OS X.
   */
  if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
     (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
    /* the given address is numerical only, prevent a reverse lookup */
    hints.ai_flags = AI_NUMERICHOST;
  }
#endif

  if(port) {
    msnprintf(sbuf, sizeof(sbuf), "%d", port);
    sbufptr = sbuf;
  }

  error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
  if(error) {
    infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);
    return NULL;
  }

  if(port) {
    Curl_addrinfo_set_port(res, port);
  }

  dump_addrinfo(conn, res);

  return res;
}
#endif /* CURLRES_SYNCH */

#endif /* CURLRES_IPV6 */