asio_transmit.cpp

/* Copyright 2015-2016 SKA South Africa
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <cstddef>
#include <boost/asio.hpp>
#include "asio_transmit.h"

using boost::asio::ip::udp;

asio_transmit::asio_transmit(const options &opts, boost::asio::io_service &io_service)
    : socket(io_service)
{
    socket.open(udp::v4());
    set_buffer_size(socket, opts.buffer_size);
    set_ttl(socket, opts.ttl);
}

void asio_transmit::send_packets(std::size_t first, std::size_t last,
                                 time_point start)
{
    (void) start; // unused
    for (std::size_t i = first; i < last; i++)
    {
        packet pkt = collector.get_packet(i);
        udp::endpoint endpoint;
        boost::asio::ip::address_v4::bytes_type host_raw;
        std::memcpy(&host_raw, &pkt.dst_host, sizeof(host_raw));
        endpoint.address(boost::asio::ip::address_v4(host_raw));
        endpoint.port(ntohs(pkt.dst_port));
        socket.send_to(boost::asio::buffer(pkt.data, pkt.len), endpoint);
    }
}

constexpr int asio_transmit::batch_size;