/* 
 * devices.cpp
 *
 * Copyright (c) 2011 Arnout Engelen
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include "devices.h"

#include <iostream>
#include <cstring>

#include <sys/socket.h>
#include <net/if.h>
#include <ifaddrs.h>

device * get_default_devices()
{
	struct ifaddrs *ifaddr, *ifa;

	if (getifaddrs(&ifaddr) == -1) 
	{
		std::cerr << "Fail to get interface addresses" << std::endl;
		// perror("getifaddrs");
		return NULL;
	}

	device* devices = NULL;
	for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) 
	{
		if (ifa->ifa_addr == NULL)  
			continue;  

		// The interface is up, not a loopback and running ?
		if ( !(ifa->ifa_flags & IFF_LOOPBACK) && 
			 (ifa->ifa_flags & IFF_UP) &&
			 (ifa->ifa_flags & IFF_RUNNING) )
		{
			// Check if the interface is already known by going through all the devices
			bool found = false;
			device* pIter = devices;
			while(pIter != NULL)
			{
				if ( strcmp(ifa->ifa_name,pIter->name) == 0 )
				{
					found = true;
				}
				pIter = pIter->next;
			}

			// We found a new interface, let's add it
			if ( found == false )
			{
				devices = new device(strdup(ifa->ifa_name),devices);
			}
		}
	}

	freeifaddrs(ifaddr);
	return devices;
}