/*
 * Copyright (C) 2015, 2016 ,2017 "IoT.bzh"
 * Author "Romain Forlot" <romain.forlot@iot.bzh>
 * Author "Loïc Collignon" <loic.collignon@iot.bzh>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *	 http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "socketcan-raw.hpp"

namespace utils
{
	/// @brief Construct a default, invalid, socket.
	socketcan_raw_t::socketcan_raw_t()
		: socketcan_t{}, socket_{INVALID_SOCKET}
	{}

	/// @brief Construct a socket by moving an existing one.
	socketcan_raw_t::socketcan_raw_t(socketcan_raw_t&& s)
		: socket_{s.socket_}
	{
		s.socket_ = INVALID_SOCKET;
	}

	/// @brief Destruct the socket.
	socketcan_raw_t::~socketcan_raw_t()
	{
		if(socket_ != INVALID_SOCKET)
			::close(socket_);
	}

 	/// @brief Open a raw socket CAN.
	/// @param[in] device_name is the kernel network device name of the CAN interface.
	///
	/// @return Upon successful completion, shall return a non-negative integer, the socket file descriptor. Otherwise, a value of -1 shall be returned and errno set to indicate the error.
	int socketcan_raw_t::open(std::string device_name)
	{
		close();
		
		struct ifreq ifr;
		socket_ = open(PF_CAN, SOCK_RAW, CAN_RAW);

		// Attempts to open a socket to CAN bus
		::strcpy(ifr.ifr_name, device_name.c_str());
		DEBUG(binder_interface, "%s: ifr_name is : %s", __FUNCTION__, ifr.ifr_name);
		if(::ioctl(socket_, SIOCGIFINDEX, &ifr) < 0)
		{
			ERROR(binder_interface, "%s: ioctl failed. Error was : %s", __FUNCTION__, strerror(errno));
			close();
		}
		else
		{
			tx_address_.can_family = AF_CAN;
			tx_address_.can_ifindex = ifr.ifr_ifindex;

			if(bind((struct sockaddr *)&tx_address_, sizeof(tx_address_)) < 0)
			{
				ERROR(binder_interface, "%s: Bind failed. %s", __FUNCTION__, strerror(errno));
				close();
			}
		}
		return socket_;
	}
}