curl/lib/hostip6.c

/***************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, 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>

#define _REENTRANT

#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

#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif

#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "strerror.h"
#include "url.h"
#include "inet_ntop.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

/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif

/***********************************************************************
 * 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);
}

/*
 * Curl_printable_address() returns a printable version of the ai->ai_addr
 * address given in the 2nd argument. The first should be the ai->ai_family
 * and the result will be stored in the buf that is bufsize bytes big.
 *
 * If the conversion fails, it returns NULL.
 */
const char *Curl_printable_address(int af, void *addr,
                                   char *buf, size_t bufsize)
{
  const struct in_addr *addr4 =
    &((const struct sockaddr_in*)addr)->sin_addr;
  const struct in6_addr *addr6 =
    &((const struct sockaddr_in6*)addr)->sin6_addr;
  return Curl_inet_ntop(af, af == AF_INET6 ?
                        (const void *)addr6 :
                        (const void *)addr4, buf, bufsize);
}


#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(Curl_addrinfo *source)
{
  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
/*
 * 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];
  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 = SOCK_STREAM;
  hints.ai_flags = AI_CANONNAME;
  snprintf(sbuf, sizeof(sbuf), "%d", port);
  error = getaddrinfo(hostname, sbuf, &hints, &res);
  if (error) {
    infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);    
    return NULL;
  }

  return res;
}
#endif /* USE_THREADING_GETADDRINFO */
#endif /* ipv6 */