/usr/include/ableton/discovery/Socket.hpp is in ableton-link-dev 1.0.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* 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, see <http://www.gnu.org/licenses/>.
*
* If you would like to incorporate Link into a proprietary software application,
* please contact <link-devs@ableton.com>.
*/
#pragma once
#include <ableton/platforms/asio/AsioService.hpp>
#include <ableton/platforms/asio/AsioWrapper.hpp>
#include <ableton/util/SafeAsyncHandler.hpp>
#include <array>
#include <cassert>
namespace ableton
{
namespace discovery
{
template <std::size_t MaxPacketSize>
struct Socket
{
Socket(platforms::asio::AsioService& io)
: mpImpl(std::make_shared<Impl>(io))
{
}
Socket(const Socket&) = delete;
Socket& operator=(const Socket&) = delete;
Socket(Socket&& rhs)
: mpImpl(std::move(rhs.mpImpl))
{
}
std::size_t send(
const uint8_t* const pData, const size_t numBytes, const asio::ip::udp::endpoint& to)
{
assert(numBytes < MaxPacketSize);
return mpImpl->mSocket.send_to(asio::buffer(pData, numBytes), to);
}
template <typename Handler>
void receive(Handler handler)
{
mpImpl->mHandler = std::move(handler);
mpImpl->mSocket.async_receive_from(
asio::buffer(mpImpl->mReceiveBuffer, MaxPacketSize), mpImpl->mSenderEndpoint,
util::makeAsyncSafe(mpImpl));
}
asio::ip::udp::endpoint endpoint() const
{
return mpImpl->mSocket.local_endpoint();
}
struct Impl
{
Impl(platforms::asio::AsioService& io)
: mSocket(io.mService, asio::ip::udp::v4())
{
}
~Impl()
{
// Ignore error codes in shutdown and close as the socket may
// have already been forcibly closed
asio::error_code ec;
mSocket.shutdown(asio::ip::udp::socket::shutdown_both, ec);
mSocket.close(ec);
}
void operator()(const asio::error_code& error, const std::size_t numBytes)
{
if (!error && numBytes > 0 && numBytes <= MaxPacketSize)
{
const auto bufBegin = begin(mReceiveBuffer);
mHandler(mSenderEndpoint, bufBegin, bufBegin + static_cast<ptrdiff_t>(numBytes));
}
}
asio::ip::udp::socket mSocket;
asio::ip::udp::endpoint mSenderEndpoint;
using Buffer = std::array<uint8_t, MaxPacketSize>;
Buffer mReceiveBuffer;
using ByteIt = typename Buffer::const_iterator;
std::function<void(const asio::ip::udp::endpoint&, ByteIt, ByteIt)> mHandler;
};
std::shared_ptr<Impl> mpImpl;
};
// Configure an asio socket for receiving multicast messages
template <std::size_t MaxPacketSize>
void configureMulticastSocket(Socket<MaxPacketSize>& socket,
const asio::ip::address_v4& addr,
const asio::ip::udp::endpoint& multicastEndpoint)
{
socket.mpImpl->mSocket.set_option(asio::ip::udp::socket::reuse_address(true));
// ???
socket.mpImpl->mSocket.set_option(asio::socket_base::broadcast(!addr.is_loopback()));
// ???
socket.mpImpl->mSocket.set_option(
asio::ip::multicast::enable_loopback(addr.is_loopback()));
socket.mpImpl->mSocket.set_option(asio::ip::multicast::outbound_interface(addr));
// Is from_string("0.0.0.0") best approach?
socket.mpImpl->mSocket.bind(
{asio::ip::address::from_string("0.0.0.0"), multicastEndpoint.port()});
socket.mpImpl->mSocket.set_option(
asio::ip::multicast::join_group(multicastEndpoint.address().to_v4(), addr));
}
// Configure an asio socket for receiving unicast messages
template <std::size_t MaxPacketSize>
void configureUnicastSocket(
Socket<MaxPacketSize>& socket, const asio::ip::address_v4& addr)
{
// ??? really necessary?
socket.mpImpl->mSocket.set_option(
asio::ip::multicast::enable_loopback(addr.is_loopback()));
socket.mpImpl->mSocket.set_option(asio::ip::multicast::outbound_interface(addr));
socket.mpImpl->mSocket.bind(asio::ip::udp::endpoint{addr, 0});
}
} // namespace discovery
} // namespace ableton
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