ip_range_permutation.h

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// Copyright (C) 2020-2023 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 IP_RANGE_PERMUTATION_H
#define IP_RANGE_PERMUTATION_H
 
#include <asiolink/io_address.h>
#include <dhcpsrv/ip_range.h>
#include <util/bigints.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);
 
    void reset();
 
private:
 
    asiolink::IOAddress range_start_;
 
    isc::util::uint128_t step_;
 
    isc::util::uint128_t cursor_;
 
    isc::util::uint128_t initial_cursor_;
 
    std::map<isc::util::uint128_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