/***************************************************************************
 *                                  _   _ ____  _
 *  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: if2ip.c,v 1.37 2004/10/06 06:58:42 bagder Exp $
 ***************************************************************************/

#include "setup.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#if !defined( WIN32 ) && !defined( __BEOS__ ) && !defined( __CYGWIN32__ ) && \
	!defined( __riscos__ ) && !defined( __INTERIX ) && !defined( NETWARE )

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#ifdef HAVE_SYS_TIME_H
/* This must be before net/if.h for AIX 3.2 to enjoy life */
#include <sys/time.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif

/* -- if2ip() -- */
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif

#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif

#if defined( HAVE_INET_NTOA_R ) && !defined( HAVE_INET_NTOA_R_DECL )
#include "inet_ntoa_r.h"
#endif

#ifdef VMS
#include <inet.h>
#endif

#include "if2ip.h"
#include "memory.h"

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

#define SYS_ERROR -1

char *Curl_if2ip( const char *interface, char *buf, int buf_size ) {
	int dummy;
	char *ip = NULL;

	if ( !interface ) {
		return NULL;
	}

	dummy = socket( AF_INET, SOCK_STREAM, 0 );
	if ( SYS_ERROR == dummy ) {
		return NULL;
	} else {
		struct ifreq req;
		size_t len = strlen( interface );
		memset( &req, 0, sizeof( req ) );
		if ( len >= sizeof( req.ifr_name ) ) {
			return NULL; /* this can't be a fine interface name */
		}
		memcpy( req.ifr_name, interface, len + 1 );
		req.ifr_addr.sa_family = AF_INET;
#ifdef IOCTL_3_ARGS
		if ( SYS_ERROR == ioctl( dummy, SIOCGIFADDR, &req ) ) {
#else
		if ( SYS_ERROR == ioctl( dummy, SIOCGIFADDR, &req, sizeof( req ) ) ) {
#endif
			sclose( dummy );
			return NULL;
		} else {
			struct in_addr in;

			struct sockaddr_in *s = (struct sockaddr_in *)&req.ifr_dstaddr;
			memcpy( &in, &( s->sin_addr.s_addr ), sizeof( in ) );
#if defined( HAVE_INET_NTOA_R )
			ip = inet_ntoa_r( in,buf,buf_size );
#else
			ip = strncpy( buf,inet_ntoa( in ),buf_size );
			ip[buf_size - 1] = 0;
#endif
		}
		sclose( dummy );
	}
	return ip;
}

/* -- end of if2ip() -- */
#else
char *Curl_if2ip( const char *interface, char *buf, int buf_size ) {
	(void) interface;
	(void) buf;
	(void) buf_size;
	return NULL;
}
#endif