/*
 * Copyright (c) 2017, Matias Fontanini
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following disclaimer
 *   in the documentation and/or other materials provided with the
 *   distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <tins/config.h>

#if !defined(TINS_HANDSHAKE_CAPTURER_H) && defined(TINS_HAVE_DOT11)
#define TINS_HANDSHAKE_CAPTURER_H

#include <vector>
#include <map>
#include <utility>
#include <tins/hw_address.h>
#include <tins/macros.h>
#include <tins/eapol.h>

namespace Tins {

/**
 * \brief Generic EAPOL handshake.
 *
 * Stores both the client and supplicant addresses, as well as 
 * all of the EAPOL packets used during the handshake.
 */
template<typename T>
class EAPOLHandshake {
public:
    typedef std::vector<T> container_type;
    typedef HWAddress<6> address_type;
    
    /**
     * \brief Default constructor.
     */
    EAPOLHandshake() { }

    /**
     * Constructs an EAPOLHandshake object.
     * 
     * \param client_address The client address.
     * \param supplicant_address The supplicant address.
     * \param cont The container that holds the EAPOL packets used
     * in the handshake.
     */
    EAPOLHandshake(const address_type& client_address, 
                   const address_type& supplicant_address, 
                   const container_type& cont) 
    : cl_address_(client_address), suppl_address_(supplicant_address), 
      handshake_(cont) {
    }
    
    /**
     * \return const address_type&
     */
    const address_type& client_address() const {
        return cl_address_;
    }
    
    /**
     * \return const address_type&
     */
    const address_type& supplicant_address() const {
        return suppl_address_;
    }
    
    /**
     * \return const container_type&
     */
    const container_type& handshake() const {
        return handshake_;
    }
private:
    address_type cl_address_, suppl_address_;
    container_type handshake_;
};

/**
 * The type used to store RSN handshakes.
 */
typedef EAPOLHandshake<RSNEAPOL> RSNHandshake;

/**
 * Captures 802.1X RSN handshakes.
 */
class TINS_API RSNHandshakeCapturer {
public:
    /**
     * The type of handshakes that will be captured.
     */
    typedef RSNHandshake handshake_type;

    /**
     * The type in which all of the captured handshakes
     * will be stored.
     */
    typedef std::vector<handshake_type> handshakes_type;
    
    /**
     * \brief Processes a packet.
     * 
     * This will fetch the RSNEAPOL layer, if any, and store
     * it in an intermediate storage. When a handshake is 
     * completed, it will be stored separately. 
     *
     * \sa RSNHandshakeCapturer::handshakes
     */
    bool process_packet(const PDU& pdu);

    /**
     * \brief Retrieves the completed handshakes.
     *
     * This will return the handshakes that have been completed 
     * so far. A handshake is completed when the 4-way handshake
     * is captured.
     *
     * \sa RSNHandshakeCapturer::clear_handshakes
     */
    const handshakes_type& handshakes() const {
        return completed_handshakes_;
    }

    /**
     * \brief Clears the completed handshakes.
     *
     * Since completed handshakes are stored in a std::vector,
     * it is advisable to remove all of them once they have been 
     * processed.
     */
    void clear_handshakes() {
        completed_handshakes_.clear();
    }
private:
    typedef handshake_type::address_type address_type;
    typedef handshake_type::container_type eapol_list;
    typedef std::map<std::pair<address_type, address_type>, eapol_list> handshake_map;

    bool do_insert(const handshake_map::key_type& key, const RSNEAPOL* eapol, 
      size_t expected);

    handshake_map handshakes_;
    handshakes_type completed_handshakes_;
};

} // Tins

#endif // TINS_HANDSHAKE_CAPTURER_H
