ip_range_permutation.h

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// Copyright (C) 2020-2021 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 IP_RANGE_PERMUTATION_H
#define IP_RANGE_PERMUTATION_H

#include <asiolink/io_address.h>
#include <dhcpsrv/ip_range.h>

#include <boost/shared_ptr.hpp>

#include <map>
#include <random>

namespace isc {
namespace dhcp {

class IPRangePermutation {
public:

    IPRangePermutation(const AddressRange& range);

    IPRangePermutation(const PrefixRange& range);

    bool exhausted() const {
        return (done_);
    }

    asiolink::IOAddress next(bool& done);

private:

    asiolink::IOAddress range_start_;

    uint64_t step_;

    uint64_t cursor_;

    std::map<uint64_t, asiolink::IOAddress> state_;

    bool done_;

    std::mt19937 generator_;
};

typedef boost::shared_ptr<IPRangePermutation> IPRangePermutationPtr;

} // end of namespace isc::dhcp
} // end of namespace isc

#endif // IP_RANGE_PERMUTATION_H