1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2013, 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 http://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
53#define _MPRINTF_REPLACE /* use our functions only */
54#include <curl/mprintf.h>
55
56#include "curl_memory.h"
57/* The last #include file should be: */
58#include "memdebug.h"
59
60/***********************************************************************
61 * Only for ipv6-enabled builds
62 **********************************************************************/
63#ifdef CURLRES_IPV6
64
65
66#if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
67/* These are strictly for memory tracing and are using the same style as the
68 * family otherwise present in memdebug.c. I put these ones here since they
69 * require a bunch of structs I didn't want to include in memdebug.c
70 */
71
72/*
73 * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
74 * (ignoring the fact c-ares doesn't return 'serv').
75 */
76
77int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
78                       GETNAMEINFO_TYPE_ARG2 salen,
79                       char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
80                       char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
81                       GETNAMEINFO_TYPE_ARG7 flags,
82                       int line, const char *source)
83{
84  int res = (getnameinfo)(sa, salen,
85                          host, hostlen,
86                          serv, servlen,
87                          flags);
88  if(0 == res)
89    /* success */
90    curl_memlog("GETNAME %s:%d getnameinfo()\n",
91                source, line);
92  else
93    curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
94                source, line, res);
95  return res;
96}
97#endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
98
99/*
100 * Curl_ipv6works() returns TRUE if ipv6 seems to work.
101 */
102bool Curl_ipv6works(void)
103{
104  /* the nature of most system is that IPv6 status doesn't come and go
105     during a program's lifetime so we only probe the first time and then we
106     have the info kept for fast re-use */
107  static int ipv6_works = -1;
108  if(-1 == ipv6_works) {
109    /* probe to see if we have a working IPv6 stack */
110    curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
111    if(s == CURL_SOCKET_BAD)
112      /* an ipv6 address was requested but we can't get/use one */
113      ipv6_works = 0;
114    else {
115      ipv6_works = 1;
116      Curl_closesocket(NULL, s);
117    }
118  }
119  return (ipv6_works>0)?TRUE:FALSE;
120}
121
122/*
123 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
124 * been set and returns TRUE if they are OK.
125 */
126bool Curl_ipvalid(struct connectdata *conn)
127{
128  if(conn->ip_version == CURL_IPRESOLVE_V6)
129    return Curl_ipv6works();
130  return TRUE;
131}
132
133#if defined(CURLRES_SYNCH)
134
135#ifdef DEBUG_ADDRINFO
136static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
137{
138  printf("dump_addrinfo:\n");
139  for(; ai; ai = ai->ai_next) {
140    char  buf[INET6_ADDRSTRLEN];
141
142    printf("    fam %2d, CNAME %s, ",
143           ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
144    if(Curl_printable_address(ai, buf, sizeof(buf)))
145      printf("%s\n", buf);
146    else
147      printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
148  }
149}
150#else
151#define dump_addrinfo(x,y) Curl_nop_stmt
152#endif
153
154/*
155 * Curl_getaddrinfo() when built ipv6-enabled (non-threading and
156 * non-ares version).
157 *
158 * Returns name information about the given hostname and port number. If
159 * successful, the 'addrinfo' is returned and the forth argument will point to
160 * memory we need to free after use. That memory *MUST* be freed with
161 * Curl_freeaddrinfo(), nothing else.
162 */
163Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
164                                const char *hostname,
165                                int port,
166                                int *waitp)
167{
168  struct addrinfo hints;
169  Curl_addrinfo *res;
170  int error;
171  char sbuf[12];
172  char *sbufptr = NULL;
173  char addrbuf[128];
174  int pf;
175  struct SessionHandle *data = conn->data;
176
177  *waitp = 0; /* synchronous response only */
178
179  /*
180   * Check if a limited name resolve has been requested.
181   */
182  switch(conn->ip_version) {
183  case CURL_IPRESOLVE_V4:
184    pf = PF_INET;
185    break;
186  case CURL_IPRESOLVE_V6:
187    pf = PF_INET6;
188    break;
189  default:
190    pf = PF_UNSPEC;
191    break;
192  }
193
194  if((pf != PF_INET) && !Curl_ipv6works())
195    /* the stack seems to be a non-ipv6 one */
196    pf = PF_INET;
197
198  memset(&hints, 0, sizeof(hints));
199  hints.ai_family = pf;
200  hints.ai_socktype = conn->socktype;
201
202  if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
203     (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
204    /* the given address is numerical only, prevent a reverse lookup */
205    hints.ai_flags = AI_NUMERICHOST;
206  }
207
208  if(port) {
209    snprintf(sbuf, sizeof(sbuf), "%d", port);
210    sbufptr=sbuf;
211  }
212  error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
213  if(error) {
214    infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
215    return NULL;
216  }
217
218  dump_addrinfo(conn, res);
219
220  return res;
221}
222#endif /* CURLRES_SYNCH */
223#endif /* CURLRES_IPV6 */
224
225