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46f3fe0e75
The check may take many milliseconds, so now it is performed once the value is first needed. Also, this change makes sure that the value is not used if the resolve is set to be IPv4-only. Closes #9553
163 lines
4.4 KiB
C
163 lines
4.4 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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/***********************************************************************
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* Only for IPv6-enabled builds
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**********************************************************************/
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#ifdef CURLRES_IPV6
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef __VMS
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#include <in.h>
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#include <inet.h>
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#endif
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#ifdef HAVE_PROCESS_H
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#include <process.h>
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "hostip.h"
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#include "hash.h"
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#include "share.h"
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#include "url.h"
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#include "inet_pton.h"
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#include "connect.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/*
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* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
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* been set and returns TRUE if they are OK.
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*/
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bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn)
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{
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if(conn->ip_version == CURL_IPRESOLVE_V6)
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return Curl_ipv6works(data);
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return TRUE;
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}
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#if defined(CURLRES_SYNCH)
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#ifdef DEBUG_ADDRINFO
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static void dump_addrinfo(struct connectdata *conn,
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const struct Curl_addrinfo *ai)
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{
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printf("dump_addrinfo:\n");
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for(; ai; ai = ai->ai_next) {
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char buf[INET6_ADDRSTRLEN];
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printf(" fam %2d, CNAME %s, ",
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ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
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Curl_printable_address(ai, buf, sizeof(buf));
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printf("%s\n", buf);
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}
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}
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#else
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#define dump_addrinfo(x,y) Curl_nop_stmt
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#endif
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/*
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* Curl_getaddrinfo() when built IPv6-enabled (non-threading and
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* non-ares version).
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*
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* Returns name information about the given hostname and port number. If
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* successful, the 'addrinfo' is returned and the fourth argument will point
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* to memory we need to free after use. That memory *MUST* be freed with
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* Curl_freeaddrinfo(), nothing else.
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*/
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struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,
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const char *hostname,
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int port,
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int *waitp)
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{
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struct addrinfo hints;
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struct Curl_addrinfo *res;
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int error;
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char sbuf[12];
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char *sbufptr = NULL;
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#ifndef USE_RESOLVE_ON_IPS
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char addrbuf[128];
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#endif
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int pf = PF_INET;
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*waitp = 0; /* synchronous response only */
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if((data->conn->ip_version != CURL_IPRESOLVE_V4) && Curl_ipv6works(data))
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/* The stack seems to be IPv6-enabled */
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pf = PF_UNSPEC;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = pf;
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hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?
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SOCK_STREAM : SOCK_DGRAM;
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#ifndef USE_RESOLVE_ON_IPS
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/*
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* The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
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* an IPv4 address on iOS and Mac OS X.
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*/
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if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
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(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
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/* the given address is numerical only, prevent a reverse lookup */
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hints.ai_flags = AI_NUMERICHOST;
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}
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#endif
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if(port) {
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msnprintf(sbuf, sizeof(sbuf), "%d", port);
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sbufptr = sbuf;
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}
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error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
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if(error) {
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infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);
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return NULL;
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}
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if(port) {
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Curl_addrinfo_set_port(res, port);
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}
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dump_addrinfo(conn, res);
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return res;
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}
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#endif /* CURLRES_SYNCH */
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#endif /* CURLRES_IPV6 */
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