| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | /***********************************************************************
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| 26 | * Only for IPv6-enabled builds
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| 27 | **********************************************************************/
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| 28 | #ifdef CURLRES_IPV6
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| 29 |
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| 30 | #ifdef HAVE_NETINET_IN_H
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| 31 | #include <netinet/in.h>
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| 32 | #endif
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| 33 | #ifdef HAVE_NETDB_H
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| 34 | #include <netdb.h>
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| 35 | #endif
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| 36 | #ifdef HAVE_ARPA_INET_H
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| 37 | #include <arpa/inet.h>
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| 38 | #endif
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| 39 | #ifdef __VMS
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| 40 | #include <in.h>
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| 41 | #include <inet.h>
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| 42 | #endif
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| 43 |
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| 44 | #ifdef HAVE_PROCESS_H
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| 45 | #include <process.h>
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| 46 | #endif
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| 47 |
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| 48 | #include "urldata.h"
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| 49 | #include "sendf.h"
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| 50 | #include "hostip.h"
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| 51 | #include "hash.h"
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| 52 | #include "share.h"
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| 53 | #include "strerror.h"
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| 54 | #include "url.h"
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| 55 | #include "inet_pton.h"
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| 56 | #include "connect.h"
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| 57 | /* The last 3 #include files should be in this order */
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| 58 | #include "curl_printf.h"
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| 59 | #include "curl_memory.h"
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| 60 | #include "memdebug.h"
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| 61 |
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| 62 | #if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
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| 63 | /* These are strictly for memory tracing and are using the same style as the
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| 64 | * family otherwise present in memdebug.c. I put these ones here since they
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| 65 | * require a bunch of structs I didn't want to include in memdebug.c
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| 66 | */
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| 67 |
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| 68 | /*
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| 69 | * For CURLRES_ARS, this should be written using ares_gethostbyaddr()
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| 70 | * (ignoring the fact c-ares doesn't return 'serv').
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| 71 | */
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| 72 |
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| 73 | int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
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| 74 | GETNAMEINFO_TYPE_ARG2 salen,
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| 75 | char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
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| 76 | char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
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| 77 | GETNAMEINFO_TYPE_ARG7 flags,
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| 78 | int line, const char *source)
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| 79 | {
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| 80 | int res = (getnameinfo)(sa, salen,
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| 81 | host, hostlen,
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| 82 | serv, servlen,
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| 83 | flags);
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| 84 | if(0 == res)
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| 85 | /* success */
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| 86 | curl_memlog("GETNAME %s:%d getnameinfo()\n",
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| 87 | source, line);
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| 88 | else
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| 89 | curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
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| 90 | source, line, res);
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| 91 | return res;
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| 92 | }
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| 93 | #endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
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| 94 |
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| 95 | /*
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| 96 | * Curl_ipv6works() returns TRUE if IPv6 seems to work.
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| 97 | */
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| 98 | bool Curl_ipv6works(void)
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| 99 | {
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| 100 | /* the nature of most system is that IPv6 status doesn't come and go
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| 101 | during a program's lifetime so we only probe the first time and then we
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| 102 | have the info kept for fast re-use */
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| 103 | static int ipv6_works = -1;
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| 104 | if(-1 == ipv6_works) {
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| 105 | /* probe to see if we have a working IPv6 stack */
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| 106 | curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
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| 107 | if(s == CURL_SOCKET_BAD)
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| 108 | /* an IPv6 address was requested but we can't get/use one */
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| 109 | ipv6_works = 0;
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| 110 | else {
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| 111 | ipv6_works = 1;
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| 112 | Curl_closesocket(NULL, s);
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| 113 | }
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| 114 | }
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| 115 | return (ipv6_works>0)?TRUE:FALSE;
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| 116 | }
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| 117 |
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| 118 | /*
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| 119 | * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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| 120 | * been set and returns TRUE if they are OK.
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| 121 | */
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| 122 | bool Curl_ipvalid(struct connectdata *conn)
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| 123 | {
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| 124 | if(conn->ip_version == CURL_IPRESOLVE_V6)
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| 125 | return Curl_ipv6works();
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| 126 |
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| 127 | return TRUE;
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| 128 | }
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| 129 |
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| 130 | #if defined(CURLRES_SYNCH)
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| 131 |
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| 132 | #ifdef DEBUG_ADDRINFO
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| 133 | static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
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| 134 | {
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| 135 | printf("dump_addrinfo:\n");
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| 136 | for(; ai; ai = ai->ai_next) {
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| 137 | char buf[INET6_ADDRSTRLEN];
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| 138 |
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| 139 | printf(" fam %2d, CNAME %s, ",
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| 140 | ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
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| 141 | if(Curl_printable_address(ai, buf, sizeof(buf)))
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| 142 | printf("%s\n", buf);
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| 143 | else
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| 144 | printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
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| 145 | }
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| 146 | }
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| 147 | #else
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| 148 | #define dump_addrinfo(x,y) Curl_nop_stmt
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| 149 | #endif
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| 150 |
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| 151 | /*
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| 152 | * Curl_getaddrinfo() when built IPv6-enabled (non-threading and
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| 153 | * non-ares version).
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| 154 | *
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| 155 | * Returns name information about the given hostname and port number. If
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| 156 | * successful, the 'addrinfo' is returned and the forth argument will point to
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| 157 | * memory we need to free after use. That memory *MUST* be freed with
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| 158 | * Curl_freeaddrinfo(), nothing else.
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| 159 | */
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| 160 | Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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| 161 | const char *hostname,
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| 162 | int port,
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| 163 | int *waitp)
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| 164 | {
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| 165 | struct addrinfo hints;
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| 166 | Curl_addrinfo *res;
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| 167 | int error;
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| 168 | char sbuf[12];
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| 169 | char *sbufptr = NULL;
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| 170 | #ifndef USE_RESOLVE_ON_IPS
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| 171 | char addrbuf[128];
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| 172 | #endif
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| 173 | int pf;
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| 174 | #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
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| 175 | struct Curl_easy *data = conn->data;
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| 176 | #endif
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| 177 |
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| 178 | *waitp = 0; /* synchronous response only */
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| 179 |
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| 180 | /* Check if a limited name resolve has been requested */
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| 181 | switch(conn->ip_version) {
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| 182 | case CURL_IPRESOLVE_V4:
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| 183 | pf = PF_INET;
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| 184 | break;
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| 185 | case CURL_IPRESOLVE_V6:
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| 186 | pf = PF_INET6;
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| 187 | break;
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| 188 | default:
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| 189 | pf = PF_UNSPEC;
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| 190 | break;
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| 191 | }
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| 192 |
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| 193 | if((pf != PF_INET) && !Curl_ipv6works())
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| 194 | /* The stack seems to be a non-IPv6 one */
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| 195 | pf = PF_INET;
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| 196 |
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| 197 | memset(&hints, 0, sizeof(hints));
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| 198 | hints.ai_family = pf;
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| 199 | hints.ai_socktype = conn->socktype;
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| 200 |
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| 201 | #ifndef USE_RESOLVE_ON_IPS
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| 202 | /*
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| 203 | * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
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| 204 | * an IPv4 address on iOS and Mac OS X.
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| 205 | */
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| 206 | if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
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| 207 | (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
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| 208 | /* the given address is numerical only, prevent a reverse lookup */
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| 209 | hints.ai_flags = AI_NUMERICHOST;
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| 210 | }
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| 211 | #endif
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| 212 |
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| 213 | if(port) {
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| 214 | snprintf(sbuf, sizeof(sbuf), "%d", port);
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| 215 | sbufptr = sbuf;
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| 216 | }
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| 217 |
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| 218 | error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
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| 219 | if(error) {
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| 220 | infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
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| 221 | return NULL;
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| 222 | }
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| 223 |
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| 224 | if(port) {
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| 225 | Curl_addrinfo_set_port(res, port);
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| 226 | }
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| 227 |
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| 228 | dump_addrinfo(conn, res);
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| 229 |
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| 230 | return res;
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| 231 | }
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| 232 | #endif /* CURLRES_SYNCH */
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| 233 |
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| 234 | #endif /* CURLRES_IPV6 */
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