actube/src/cw/sock_getbroadcastaddr.c

/*
    This file is part of libcapwap.

    libcapwap is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    libcapwap is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with libcapwap.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 *@file
 *@brief Implementation of sock_getbroadcastaddr
 */


#include <string.h>
#include <ifaddrs.h>

#include "sock.h"

/**
 * Get the broadcast adddress
 * @param addr address to search
 * @param broadcastaddr receives the resulting broadcast address
 * @return 1 if successful, 0 if no braodcast address was determined
 */
int sock_getbroadcastaddr(const struct sockaddr * addr,struct sockaddr * broadcastaddr)
{
        struct ifaddrs *ifap,*ifa;
	int rc;
	if ( getifaddrs(&ifap)==-1)
		return 0;

	rc=0;
        for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {

		if (sock_cmpaddr(addr,ifa->ifa_addr,0))
			continue;
		memcpy (broadcastaddr, ifa->ifa_broadaddr, sock_addrlen(ifa->ifa_broadaddr));
		rc=1;
		break;
        }
        freeifaddrs(ifap);
	return rc;
}