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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2025 Laurent Gomila (laurent@sfml-dev.org)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#pragma once
////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Network/Export.hpp>
#include <SFML/Network/IpAddress.hpp>
#include <SFML/Network/Socket.hpp>
namespace sf
{
class TcpSocket;
////////////////////////////////////////////////////////////
/// \brief Socket that listens to new TCP connections
///
////////////////////////////////////////////////////////////
class SFML_NETWORK_API TcpListener : public Socket
{
public:
////////////////////////////////////////////////////////////
/// \brief Default constructor
///
////////////////////////////////////////////////////////////
TcpListener();
////////////////////////////////////////////////////////////
/// \brief Get the port to which the socket is bound locally
///
/// If the socket is not listening to a port, this function
/// returns 0.
///
/// \return Port to which the socket is bound
///
/// \see `listen`
///
////////////////////////////////////////////////////////////
[[nodiscard]] unsigned short getLocalPort() const;
////////////////////////////////////////////////////////////
/// \brief Start listening for incoming connection attempts
///
/// This function makes the socket start listening on the
/// specified port, waiting for incoming connection attempts.
///
/// If the socket is already listening on a port when this
/// function is called, it will stop listening on the old
/// port before starting to listen on the new port.
///
/// When providing `sf::Socket::AnyPort` as port, the listener
/// will request an available port from the system.
/// The chosen port can be retrieved by calling `getLocalPort()`.
///
/// \param port Port to listen on for incoming connection attempts
/// \param address Address of the interface to listen on
///
/// \return Status code
///
/// \see `accept`, `close`
///
////////////////////////////////////////////////////////////
[[nodiscard]] Status listen(unsigned short port, IpAddress address = IpAddress::Any);
////////////////////////////////////////////////////////////
/// \brief Stop listening and close the socket
///
/// This function gracefully stops the listener. If the
/// socket is not listening, this function has no effect.
///
/// \see `listen`
///
////////////////////////////////////////////////////////////
void close();
////////////////////////////////////////////////////////////
/// \brief Accept a new connection
///
/// If the socket is in blocking mode, this function will
/// not return until a connection is actually received.
///
/// \param socket Socket that will hold the new connection
///
/// \return Status code
///
/// \see `listen`
///
////////////////////////////////////////////////////////////
[[nodiscard]] Status accept(TcpSocket& socket);
};
} // namespace sf
////////////////////////////////////////////////////////////
/// \class sf::TcpListener
/// \ingroup network
///
/// A listener socket is a special type of socket that listens to
/// a given port and waits for connections on that port.
/// This is all it can do.
///
/// When a new connection is received, you must call accept and
/// the listener returns a new instance of `sf::TcpSocket` that
/// is properly initialized and can be used to communicate with
/// the new client.
///
/// Listener sockets are specific to the TCP protocol,
/// UDP sockets are connectionless and can therefore communicate
/// directly. As a consequence, a listener socket will always
/// return the new connections as `sf::TcpSocket` instances.
///
/// A listener is automatically closed on destruction, like all
/// other types of socket. However if you want to stop listening
/// before the socket is destroyed, you can call its `close()`
/// function.
///
/// Usage example:
/// \code
/// // Create a listener socket and make it wait for new
/// // connections on port 55001
/// sf::TcpListener listener;
/// listener.listen(55001);
///
/// // Endless loop that waits for new connections
/// while (running)
/// {
/// sf::TcpSocket client;
/// if (listener.accept(client) == sf::Socket::Done)
/// {
/// // A new client just connected!
/// std::cout << "New connection received from " << client.getRemoteAddress().value() << std::endl;
/// doSomethingWith(client);
/// }
/// }
/// \endcode
///
/// \see `sf::TcpSocket`, `sf::Socket`
///
////////////////////////////////////////////////////////////
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