udp.cpp

#include <cstring>
#include <stdexcept>
#include <string_view>

#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <unistd.h>

#include "udp.hpp"

namespace multicast
{
namespace udp
{

Socket::Socket()
{
    fd_ = socket(AF_INET, SOCK_DGRAM, 0);
    if (fd_ < 0)
    {
        throw std::runtime_error("failed to open UDP socket");
    }
}

int Socket::Handler() const noexcept
{
    return fd_;
}

Socket::~Socket() noexcept
{
    close(fd_);
}

bool send(const Socket& socket, const sockaddr_in& address,
    std::string_view message)
{
    sockaddr addr{};

    static_assert(sizeof(addr) == sizeof(address));
    std::memcpy(&addr, &address, sizeof(addr));

    const ssize_t sent = sendto(socket.Handler(), message.data(),
        message.size(), 0, &addr, sizeof(addr));

    return sent >= 0;
}

} // namespace udp
} // namespace multicast