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curl/lib/hostip6.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2005, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#include <string.h>
#include <errno.h>
#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
#include <malloc.h>
#else
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h> /* required for free() prototypes */
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for the close() proto */
#endif
#ifdef VMS
#include <in.h>
#include <inet.h>
#include <stdlib.h>
#endif
#endif
#ifdef HAVE_SETJMP_H
#include <setjmp.h>
#endif
#ifdef WIN32
#include <process.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "strerror.h"
#include "url.h"
#include "inet_pton.h"
#include "connect.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
#include "inet_ntoa_r.h"
#endif
#include "memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/***********************************************************************
* Only for ipv6-enabled builds
**********************************************************************/
#ifdef CURLRES_IPV6
/*
* This is a wrapper function for freeing name information in a protocol
* independent way. This takes care of using the appropriate underlaying
* function.
*/
void Curl_freeaddrinfo(Curl_addrinfo *p)
{
freeaddrinfo(p);
}
#ifdef CURLRES_ASYNCH
/*
* Curl_addrinfo_copy() is used by the asynch callback to copy a given
* address. But this is an ipv6 build and then we don't copy the address, we
* just return the same pointer!
*/
Curl_addrinfo *Curl_addrinfo_copy(void *source, int port)
{
(void) port;
return source;
}
#endif
#ifdef CURLDEBUG
/* These are strictly for memory tracing and are using the same style as the
* family otherwise present in memdebug.c. I put these ones here since they
* require a bunch of structs I didn't wanna include in memdebug.c
*/
int curl_dogetaddrinfo(char *hostname, char *service,
struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source)
{
int res=(getaddrinfo)(hostname, service, hints, result);
if(0 == res) {
/* success */
if(logfile)
fprintf(logfile, "ADDR %s:%d getaddrinfo() = %p\n",
source, line, (void *)*result);
}
else {
if(logfile)
fprintf(logfile, "ADDR %s:%d getaddrinfo() failed\n",
source, line);
}
return res;
}
int curl_dogetnameinfo(const struct sockaddr *sa, socklen_t salen,
char *host, size_t hostlen,
char *serv, size_t servlen, int flags,
int line, const char *source)
{
int res = (getnameinfo)(sa, salen,
host, hostlen,
serv, servlen,
flags);
if(0 == res) {
/* success */
if(logfile)
fprintf(logfile, "GETNAME %s:%d getnameinfo()\n",
source, line);
}
else {
if(logfile)
fprintf(logfile, "GETNAME %s:%d getnameinfo() failed = %d\n",
source, line, res);
}
return res;
}
void curl_dofreeaddrinfo(struct addrinfo *freethis,
int line, const char *source)
{
(freeaddrinfo)(freethis);
if(logfile)
fprintf(logfile, "ADDR %s:%d freeaddrinfo(%p)\n",
source, line, (void *)freethis);
}
#endif
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
*/
bool Curl_ipvalid(struct SessionHandle *data)
{
if(data->set.ip_version == CURL_IPRESOLVE_V6) {
/* see if we have an IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s == CURL_SOCKET_BAD)
/* an ipv6 address was requested and we can't get/use one */
return FALSE;
sclose(s);
}
return TRUE;
}
#ifndef USE_THREADING_GETADDRINFO
#ifdef DEBUG_ADDRINFO
static void dump_addrinfo(struct connectdata *conn, const struct addrinfo *ai)
{
printf("dump_addrinfo:\n");
for ( ; ai; ai = ai->ai_next) {
char buf[INET6_ADDRSTRLEN];
printf(" fam %2d, CNAME %s, ",
ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
if (Curl_printable_address(ai, buf, sizeof(buf)))
printf("%s\n", buf);
else
printf("failed; %s\n", Curl_strerror(conn, Curl_ourerrno()));
}
}
#else
#define dump_addrinfo(x,y)
#endif
/*
* Curl_getaddrinfo() when built ipv6-enabled (non-threading version).
*
* Returns name information about the given hostname and port number. If
* successful, the 'addrinfo' is returned and the forth argument will point to
* memory we need to free after use. That memory *MUST* be freed with
* Curl_freeaddrinfo(), nothing else.
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
char *hostname,
int port,
int *waitp)
{
struct addrinfo hints, *res;
int error;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
char addrbuf[128];
curl_socket_t s;
int pf;
struct SessionHandle *data = conn->data;
*waitp=0; /* don't wait, we have the response now */
/* see if we have an IPv6 stack */
s = socket(PF_INET6, SOCK_DGRAM, 0);
if (s < 0) {
/* Some non-IPv6 stacks have been found to make very slow name resolves
* when PF_UNSPEC is used, so thus we switch to a mere PF_INET lookup if
* the stack seems to be a non-ipv6 one. */
pf = PF_INET;
}
else {
/* This seems to be an IPv6-capable stack, use PF_UNSPEC for the widest
* possible checks. And close the socket again.
*/
sclose(s);
/*
* Check if a more limited name resolve has been requested.
*/
switch(data->set.ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
/* the given address is numerical only, prevent a reverse lookup */
hints.ai_flags = AI_NUMERICHOST;
}
#if 0 /* removed nov 8 2005 before 7.15.1 */
else
hints.ai_flags = AI_CANONNAME;
#endif
if(port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr=sbuf;
}
error = getaddrinfo(hostname, sbufptr, &hints, &res);
if (error) {
infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
return NULL;
}
dump_addrinfo(conn, res);
return res;
}
#endif /* USE_THREADING_GETADDRINFO */
#endif /* ipv6 */
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