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// Copyright (C) 2014-2015 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 HOST_CONTAINER_H
#define HOST_CONTAINER_H
#include <dhcpsrv/host.h>
#include <dhcpsrv/subnet_id.h>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/composite_key.hpp>
#include <boost/multi_index/mem_fun.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/hashed_index.hpp>
namespace isc {
namespace dhcp {
/// @brief Multi-index container holding host reservations.
///
/// This container holds a collection of @c Host objects which can be retrieved
/// using various parameters. The typical use of this container is to search for
/// all @c Host objects which are identified by a specified identifier, i.e.
/// HW address or DUID.
///
/// @todo This container will be extended to search for @c Host objects
/// associated with a specific IPv4 address or IPv6 prefix/length.
///
/// @see http://www.boost.org/doc/libs/1_56_0/libs/multi_index/doc/index.html
typedef boost::multi_index_container<
// This container stores pointers to Host objects.
HostPtr,
// Start specification of indexes here.
boost::multi_index::indexed_by<
// First index is used to search for the host using one of the
// identifiers, i.e. HW address or DUID. The elements of this
// index are non-unique because there may be multiple reservations
// for the same host belonging to a different subnets.
boost::multi_index::ordered_non_unique<
// The index comprises actual identifier (HW address or DUID) in
// a binary form and a type of the identifier which indicates
// that it is HW address or DUID.
boost::multi_index::composite_key<
// Composite key uses members of the Host class.
Host,
// Binary identifier is retrieved from the Host class using
// a getIdentifier method.
boost::multi_index::const_mem_fun<
Host, const std::vector<uint8_t>&,
&Host::getIdentifier
>,
// Identifier type is retrieved from the Host class using
// a getIdentifierType method.
boost::multi_index::const_mem_fun<
Host, Host::IdentifierType,
&Host::getIdentifierType
>
>
>,
// Second index is used to search for the host using reserved IPv4
// address.
boost::multi_index::ordered_non_unique<
// Index using values returned by the @c Host::getIPv4Resrvation.
boost::multi_index::const_mem_fun<Host, const asiolink::IOAddress&,
&Host::getIPv4Reservation>
>
>
> HostContainer;
/// @brief First index type in the @c HostContainer.
///
/// This index allows for searching for @c Host objects using an
/// identifier + identifier type tuple.
typedef HostContainer::nth_index<0>::type HostContainerIndex0;
/// @brief Results range returned using the @c HostContainerIndex0.
typedef std::pair<HostContainerIndex0::iterator,
HostContainerIndex0::iterator> HostContainerIndex0Range;
/// @brief Second index type in the @c HostContainer.
///
/// This index allows for searching for @c Host objects using a
/// reserved IPv4 address.
typedef HostContainer::nth_index<1>::type HostContainerIndex1;
/// @brief Results range returned using the @c HostContainerIndex1.
typedef std::pair<HostContainerIndex1::iterator,
HostContainerIndex1::iterator> HostContainerIndex1Range;
/// @brief Defines one entry for the Host Container for v6 hosts
///
/// It's essentially a pair of (IPv6 reservation, Host pointer).
/// This structure is used as an intermediate structure in HostContainer6.
/// For a single host that has reservations for X addresses or prefixes, there
/// will be X HostResrv6Tuple structures.
struct HostResrv6Tuple {
/// @brief Default constructor.
///
/// @param resrv IPv6 address/prefix reservation
/// @param host pointer to the host object
HostResrv6Tuple(const IPv6Resrv& resrv, const HostPtr& host)
:resrv_(resrv), host_(host), subnet_id_(host ? host->getIPv6SubnetID() : 0) {
}
/// @brief Address or prefix reservation.
const IPv6Resrv resrv_;
/// @brief Pointer to the host object.
HostPtr host_;
/// @brief Value of the IPv6 Subnet-id
const SubnetID subnet_id_;
/// @brief Key extractor (used in the second composite key)
const asiolink::IOAddress& getKey() const {
return (resrv_.getPrefix());
}
};
/// @brief Multi-index container holding IPv6 reservations.
///
/// This container holds HostResrv6Tuples, i.e. pairs of (IPv6Resrv, HostPtr)
/// pieces of information. This is needed for efficiently finding a host
/// for a given IPv6 address or prefix.
typedef boost::multi_index_container<
// This containers stores (IPv6Resrv, HostPtr) tuples
HostResrv6Tuple,
// Start specification of indexes here.
boost::multi_index::indexed_by<
// First index is used to search by an address.
boost::multi_index::ordered_non_unique<
// Address is extracted by calling IPv6Resrv::getPrefix()
// and it will return an IOAddress object.
boost::multi_index::const_mem_fun<
HostResrv6Tuple, const asiolink::IOAddress&, &HostResrv6Tuple::getKey>
>,
// Second index is used to search by (subnet_id, address) pair.
// This is
boost::multi_index::ordered_unique<
/// This is a composite key. It uses two keys: subnet-id and
/// IPv6 address reservation.
boost::multi_index::composite_key<
// Composite key uses members of the HostResrv6Tuple class.
HostResrv6Tuple,
// First key extractor. Gets subnet-id as a member of the
// HostResrv6Tuple structure.
boost::multi_index::member<HostResrv6Tuple, const SubnetID,
&HostResrv6Tuple::subnet_id_>,
// Second key extractor. Address is extracted by calling
// IPv6Resrv::getPrefix() and it will return an IOAddress object.
boost::multi_index::const_mem_fun<
HostResrv6Tuple, const asiolink::IOAddress&,
&HostResrv6Tuple::getKey
>
>
>
>
> HostContainer6;
/// @brief First index type in the @c HostContainer6.
///
/// This index allows for searching for @c Host objects using an
/// address.
typedef HostContainer6::nth_index<0>::type HostContainer6Index0;
/// @brief Results range returned using the @c HostContainer6Index0.
typedef std::pair<HostContainer6Index0::iterator,
HostContainer6Index0::iterator> HostContainer6Index0Range;
/// @brief Second index type in the @c HostContainer6.
///
/// This index allows for searching for @c Host objects using a
/// reserved (SubnetID, IPv6 address) tuple.
typedef HostContainer6::nth_index<1>::type HostContainer6Index1;
/// @brief Results range returned using the @c HostContainer6Index1.
typedef std::pair<HostContainer6Index1::iterator,
HostContainer6Index1::iterator> HostContainer6Index1Range;
}; // end of isc::dhcp namespace
}; // end of isc namespace
#endif // HOST_CONTAINER_H
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