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https://github.com/moparisthebest/curl
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237 lines
6.5 KiB
C
237 lines
6.5 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 - 2011, 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 http://curl.haxx.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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***************************************************************************/
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#include "setup.h"
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#include <string.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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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 HAVE_STDLIB_H
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#include <stdlib.h> /* required for free() prototypes */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for the close() proto */
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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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#include <stdlib.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 "strerror.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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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "curl_memory.h"
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/* The last #include file should be: */
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#include "memdebug.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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#if defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO)
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/* These are strictly for memory tracing and are using the same style as the
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* family otherwise present in memdebug.c. I put these ones here since they
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* require a bunch of structs I didn't want to include in memdebug.c
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*/
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/*
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* For CURLRES_ARS, this should be written using ares_gethostbyaddr()
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* (ignoring the fact c-ares doesn't return 'serv').
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*/
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int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
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GETNAMEINFO_TYPE_ARG2 salen,
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char *host, GETNAMEINFO_TYPE_ARG46 hostlen,
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char *serv, GETNAMEINFO_TYPE_ARG46 servlen,
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GETNAMEINFO_TYPE_ARG7 flags,
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int line, const char *source)
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{
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int res = (getnameinfo)(sa, salen,
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host, hostlen,
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serv, servlen,
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flags);
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if(0 == res)
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/* success */
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curl_memlog("GETNAME %s:%d getnameinfo()\n",
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source, line);
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else
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curl_memlog("GETNAME %s:%d getnameinfo() failed = %d\n",
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source, line, res);
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return res;
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}
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#endif /* defined(CURLDEBUG) && defined(HAVE_GETNAMEINFO) */
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/*
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* Curl_ipv6works() returns TRUE if ipv6 seems to work.
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*/
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bool Curl_ipv6works(void)
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{
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/* the nature of most system is that IPv6 status doesn't come and go
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during a program's lifetime so we only probe the first time and then we
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have the info kept for fast re-use */
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static int ipv6_works = -1;
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if(-1 == ipv6_works) {
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/* probe to see if we have a working IPv6 stack */
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curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
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if(s == CURL_SOCKET_BAD)
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/* an ipv6 address was requested but we can't get/use one */
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ipv6_works = 0;
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else {
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ipv6_works = 1;
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sclose(s);
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}
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}
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return (ipv6_works>0)?TRUE:FALSE;
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}
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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 connectdata *conn)
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{
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if(conn->ip_version == CURL_IPRESOLVE_V6)
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return Curl_ipv6works();
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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, const 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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if(Curl_printable_address(ai, buf, sizeof(buf)))
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printf("%s\n", buf);
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else
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printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
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}
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}
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#else
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#define dump_addrinfo(x,y)
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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 forth argument will point to
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* 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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Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
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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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Curl_addrinfo *res;
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int error;
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char sbuf[NI_MAXSERV];
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char *sbufptr = NULL;
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char addrbuf[128];
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int pf;
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struct SessionHandle *data = conn->data;
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*waitp = 0; /* synchronous response only */
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/*
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* Check if a limited name resolve has been requested.
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*/
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switch(conn->ip_version) {
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case CURL_IPRESOLVE_V4:
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pf = PF_INET;
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break;
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case CURL_IPRESOLVE_V6:
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pf = PF_INET6;
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break;
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default:
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pf = PF_UNSPEC;
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break;
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}
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if((pf != PF_INET) && !Curl_ipv6works())
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/* the stack seems to be a non-ipv6 one */
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pf = PF_INET;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = pf;
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hints.ai_socktype = conn->socktype;
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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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if(port) {
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snprintf(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\n", hostname, port);
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return NULL;
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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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