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