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// Copyright (C) 2015-2018 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef PKT4O6_H
#define PKT4O6_H
#include <dhcp/pkt4.h>
#include <dhcp/pkt6.h>
#include <boost/shared_ptr.hpp>
namespace isc {
namespace dhcp {
/// @brief Represents DHCPv4-over-DHCPv6 packet
///
/// This class derives from @c Pkt4 in order to be handled by
/// the DHCPv4 server code. It includes a shared pointer to the
/// DHCPv6 message too.
///
/// This is an implementation of the DHCPv4-query/response DHCPv6 messages
/// defined in RFC 7341 (http://ietf.org/rfc/rfc7341.txt).
/// See also
/// https://gitlab.isc.org/isc-projects/kea/wikis/designs/dhcpv4o6-design
/// for design discussions.
class Pkt4o6 : public Pkt4 {
public:
/// @brief Constructor, used in message reception.
///
/// @param pkt4 Content of the DHCPv4-message option
/// @param pkt6 encapsulating unpacked DHCPv6 message
/// the DHCPv4 message option will be removed
Pkt4o6(const OptionBuffer& pkt4, const Pkt6Ptr& pkt6);
/// @brief Constructor, used in replying to a message
///
/// @param pkt4 DHCPv4 message
/// @param pkt6 DHCPv6 message
Pkt4o6(const Pkt4Ptr& pkt4, const Pkt6Ptr& pkt6);
/// @brief Returns encapsulating DHCPv6 message
Pkt6Ptr getPkt6() const { return (pkt6_); }
/// @brief Prepares on-wire format of DHCPv4-over-DHCPv6 packet.
///
/// Calls pack() on both DHCPv4 and DHCPv6 parts
/// Inserts the DHCPv4-message option
/// @ref Pkt4::pack and @ref Pkt6::pack
virtual void pack();
/// @brief Checks if a DHCPv4 message has been transported over DHCPv6
///
/// @return Boolean value which indicates whether the message is
/// transported over DHCPv6 (true) or native DHCPv4 (false)
virtual bool isDhcp4o6() const {
return (true);
}
/// @brief Overrides the @ref Pkt::setCopyRetrievedOptions to also
/// set the flag for encapsulated @ref Pkt6 instance.
///
/// When the flag is set for the instance of the @ref Pkt4o6 the
/// encapsulated Pkt6, retrieved with @ref Pkt4o6::getPkt6, will
/// inherit this setting.
///
/// @param copy Indicates if the options should be copied when
/// retrieved (if true), or not copied (if false).
virtual void setCopyRetrievedOptions(const bool copy);
private:
/// Encapsulating DHCPv6 message
Pkt6Ptr pkt6_;
}; // Pkt4o6 class
/// @brief A pointer to Pkt4o6 object.
typedef boost::shared_ptr<Pkt4o6> Pkt4o6Ptr;
} // isc::dhcp namespace
} // isc namespace
#endif
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