/***************************************************************************
 *                                  _   _ ____  _
 *  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: hostasyn.c,v 1.7 2004/10/06 07:50:18 bagder Exp $
 ***************************************************************************/

#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"

#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 builds using asynchronous name resolves
 **********************************************************************/
#ifdef CURLRES_ASYNCH
/*
 * addrinfo_callback() gets called by ares, gethostbyname_thread() or
 * getaddrinfo_thread() when we got the name resolved (or not!).
 *
 * If the status argument is CURL_ASYNC_SUCCESS, we might need to copy the
 * address field since it might be freed when this function returns. This
 * operation stores the resolved data in the DNS cache.
 *
 * NOTE: for IPv6 operations, Curl_addrinfo_copy() returns the same
 * pointer it is given as argument!
 *
 * The storage operation locks and unlocks the DNS cache.
 */
static void addrinfo_callback( void *arg, /* "struct connectdata *" */
							   int status,
							   void *addr ) {
	struct connectdata *conn = (struct connectdata *)arg;
	struct Curl_dns_entry *dns = NULL;

	conn->async.status = status;

	if ( CURL_ASYNC_SUCCESS == status ) {

		/*
		 * IPv4: Curl_addrinfo_copy() copies the address and returns an allocated
		 * version.
		 *
		 * IPv6: Curl_addrinfo_copy() returns the input pointer!
		 */
		Curl_addrinfo *ai = Curl_addrinfo_copy( addr, conn->async.port );
		if ( ai ) {
			struct SessionHandle *data = conn->data;

			if ( data->share ) {
				Curl_share_lock( data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE );
			}

			dns = Curl_cache_addr( data, ai,
								   conn->async.hostname,
								   conn->async.port );
			if ( !dns ) {
				/* failed to store, cleanup and return error */
				Curl_freeaddrinfo( ai );
			}

			if ( data->share ) {
				Curl_share_unlock( data, CURL_LOCK_DATA_DNS );
			}
		}
	}

	conn->async.dns = dns;

	/* Set async.done TRUE last in this function since it may be used multi-
	   threaded and once this is TRUE the other thread may read fields from the
	   async struct */
	conn->async.done = TRUE;

	/* ipv4: The input hostent struct will be freed by ares when we return from
	   this function */
}

void Curl_addrinfo4_callback( void *arg, /* "struct connectdata *" */
							  int status,
							  struct hostent *hostent ) {
	addrinfo_callback( arg, status, hostent );
}

#ifdef CURLRES_IPV6
void Curl_addrinfo6_callback( void *arg, /* "struct connectdata *" */
							  int status,
							  struct addrinfo *ai ) {
	addrinfo_callback( arg, status, ai );
}
#endif

#endif /* CURLRES_ASYNC */
