text: /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
  /*
   * Copyright (c) 2022 Talha Ibn Aziz
   * 
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation;
   *
   * 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, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   * 
   * Author:  Talha Ibn Aziz <taziz@ualberta.ca> <talhaibnaziz6343@gmail.com>
   * Date:    2022.03.03
   * Company: University of Alberta/Canada - Computing Science
   * 
   * Modelled after udp-echo-server.h
   */
  
  #ifndef TCP_SERVER_H
  #define TCP_SERVER_H
  
  #include "ns3/application.h"
  #include "ns3/event-id.h"
  #include "ns3/ptr.h"
  #include "ns3/address.h"
  #include "ns3/traced-callback.h"
  
  namespace ns3 {
  
  class Socket;
  class Packet;
  
  /**
   * \ingroup applications 
   * \defgroup udpecho UdpEcho
   */
  
  /**
   * \ingroup udpecho
   * \brief A Udp Echo server
   *
   * Every packet received is sent back.
   */
  class TcpServer : public Application 
  {
  public:
    /**
     * \brief Get the type ID.
     * \return the object TypeId
     */
    static TypeId GetTypeId (void);
  
    TcpServer ();
  
    /**
     * \return pointer to the listening socket.
     */
    Ptr<Socket> GetListeningSocket(void) const;
  
    /**
     * \return list of pointer to accepted sockets
     */
    std::list<Ptr<Socket>> GetAcceptedSockets(void) const;
  
    /**
     * \brief set the callback function that is called when a packet is received
     * \param callback the function to which the callback is set.
     */
    void SetPacketReceivedCallBack(void (*callback)(Ptr<Socket> socket));
    virtual ~TcpServer ();
  
  
  
  protected:
    virtual void DoDispose (void);
  
  private:
  
    virtual void StartApplication (void);
    virtual void StopApplication (void);
  
    /**
     * \brief Handle a packet reception.
     *
     * This function is called by lower layers.
     *
     * \param socket the socket the packet was received to.
     */
    void HandleRead (Ptr<Socket> socket);
  
    /**
     * \brief Handle a connection request received by the application.
     * \param socket the incoming connection socket
     * \param from the address the connection is from
     */
    bool HandleRequest(Ptr<Socket> socket, const Address &from);
  
    /**
     * \brief Handle an incoming connection that has been accepted
     * \param socket the incoming connection socket
     * \param from the address the connection is from
     */
    void HandleAccept(Ptr<Socket> socket, const Address &from);
  
    /**
     * \brief Handle an connection close
     * \param socket the connected socket
     */
    void HandlePeerClose(Ptr<Socket> socket);
  
    /**
     * \brief Handle an connection error
     * \param socket the connected socket
     */
    void HandlePeerError(Ptr<Socket> socket);
  
    // A list of sockets that have been accepted
    std::list<Ptr<Socket>> m_acceptedSocketList; //!< the accepted sockets
  
    uint16_t m_port; //!< Port on which we listen for incoming packets.
    Ptr<Socket> m_socket; //!< IPv4 Socket
    Ptr<Socket> m_socket6; //!< IPv6 Socket
    Address m_local; //!< local multicast address
    /// The function that will be called when a packet is received
    void (*m_packetReceivedCallback)(Ptr<Socket> socket);
  
    /// Callbacks for tracing the packet Rx events
    TracedCallback<Ptr<const Packet> > m_rxTrace;
  
    /// Callbacks for tracing the packet Rx events, includes source and destination addresses
    TracedCallback<Ptr<const Packet>, const Address &, const Address &> m_rxTraceWithAddresses;
  };
  
  } // namespace ns3
  
  #endif /* TCP_SERVER_H */
  
  