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// Copyright (C) 2022-2023 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 RANDOM_ALLOCATION_STATE_H
#define RANDOM_ALLOCATION_STATE_H
#include <dhcpsrv/allocation_state.h>
#include <dhcpsrv/ip_range_permutation.h>
#include <dhcpsrv/pool.h>
#include <boost/shared_ptr.hpp>
#include <cstdint>
namespace isc {
namespace dhcp {
/// @brief Forward declaration of the @c PoolRandomAllocationState.
class PoolRandomAllocationState;
/// @brief Type of the pointer to the @c PoolRandomAllocationState.
typedef boost::shared_ptr<PoolRandomAllocationState> PoolRandomAllocationStatePtr;
/// @brief Pool allocation state used by the random allocator.
///
/// It extends the base class with the mechanism that maintains
/// an address or delegated prefix pool permutation. The
/// permutation serves random, non-repeating leases.
class PoolRandomAllocationState : public AllocationState {
public:
/// @brief Factory function creating the state instance from pool.
///
/// @param pool instance of the pool for which the allocation state
/// should be instantiated.
/// @return new allocation state instance.
static PoolRandomAllocationStatePtr create(const PoolPtr& pool);
/// @brief Constructor from an IP address pool.
///
/// @param first first address in the pool.
/// @param last last address in the pool.
PoolRandomAllocationState(const asiolink::IOAddress& first,
const asiolink::IOAddress& last);
/// @brief Constructor from a delegated prefix pool.
///
/// @param first first address in the pool.
/// @param last last prefix in the pool.
/// @param delegated delegated prefix length.
PoolRandomAllocationState(const asiolink::IOAddress& first,
const asiolink::IOAddress& last,
const uint8_t delegated);
/// @brief Returns a pointer to the permutation of addresses
/// or delegated prefixes.
///
/// @return permutation instance.
IPRangePermutationPtr getPermutation() const {
return (permutation_);
}
private:
/// @brief Permutation instance for the pool.
IPRangePermutationPtr permutation_;
};
} // end of isc::dhcp namespace
} // end of isc namespace
#endif // RANDOM_ALLOCATION_STATE_H
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