random_allocator.h

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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_ALLOCATOR_H
#define RANDOM_ALLOCATOR_H
 
#include <dhcpsrv/allocator.h>
#include <dhcpsrv/random_allocation_state.h>
#include <dhcpsrv/lease.h>
#include <cstdint>
#include <random>
 
namespace isc {
namespace dhcp {
 
class RandomAllocator : public Allocator {
public:
 
    RandomAllocator(Lease::Type type, const WeakSubnetPtr& subnet);
 
    virtual std::string getType() const {
        return ("random");
    }
 
private:
 
    virtual asiolink::IOAddress pickAddressInternal(const ClientClasses& client_classes,
                                                    const IdentifierBaseTypePtr& duid,
                                                    const asiolink::IOAddress& hint);
 
    virtual asiolink::IOAddress pickPrefixInternal(const ClientClasses& client_classes,
                                                   Pool6Ptr& pool,
                                                   const IdentifierBaseTypePtr& duid,
                                                   PrefixLenMatchType prefix_length_match,
                                                   const asiolink::IOAddress& hint,
                                                   uint8_t hint_prefix_length);
 
    PoolRandomAllocationStatePtr getPoolState(const PoolPtr& pool) const;
 
    uint64_t getRandomNumber(uint64_t limit);
 
    std::mt19937 generator_;
};
 
} // end of namespace isc::dhcp
} // end of namespace isc
 
#endif // RANDOM_ALLOCATOR_H