mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-01-31 00:00:06 +08:00
138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef OPENVPN_ADDR_RANGE_H
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#define OPENVPN_ADDR_RANGE_H
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#include <string>
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#include <sstream>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/addr/ip.hpp>
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namespace openvpn {
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namespace IP {
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// Denote a range of IP addresses with a start and extent,
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// where A represents an address class.
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// A should be a network address class such as IP::Addr, IPv4::Addr, or IPv6::Addr.
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template <typename ADDR>
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class RangeType
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{
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public:
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class Iterator
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{
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friend class RangeType;
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public:
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bool more() const { return remaining_ > 0; }
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const ADDR& addr() const { return addr_; }
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void next()
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{
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if (more())
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{
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++addr_;
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--remaining_;
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}
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}
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private:
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Iterator(const RangeType& range)
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: addr_(range.start_), remaining_(range.extent_) {}
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ADDR addr_;
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size_t remaining_;
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};
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RangeType() : extent_(0) {}
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RangeType(const ADDR& start, const size_t extent)
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: start_(start), extent_(extent) {}
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Iterator iterator() const { return Iterator(*this); }
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const bool defined() const { return extent_ > 0; }
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const ADDR& start() const { return start_; }
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size_t extent() const { return extent_; }
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RangeType pull_front(size_t extent)
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{
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if (extent > extent_)
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extent = extent_;
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RangeType ret(start_, extent);
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start_ += extent;
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extent_ -= extent;
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return ret;
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}
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std::string to_string() const
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{
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std::ostringstream os;
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os << start_.to_string() << '[' << extent_ << ']';
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return os.str();
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}
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private:
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ADDR start_;
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size_t extent_;
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};
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template <typename ADDR>
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class RangePartitionType
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{
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public:
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RangePartitionType(const RangeType<ADDR>& src_range, const size_t n_partitions)
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: range(src_range),
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remaining(n_partitions)
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{
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}
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bool next(RangeType<ADDR>& r)
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{
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if (remaining)
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{
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if (remaining > 1)
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r = range.pull_front(range.extent() / remaining);
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else
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r = range;
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--remaining;
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return r.defined();
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}
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else
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return false;
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}
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private:
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RangeType<ADDR> range;
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size_t remaining;
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};
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typedef RangeType<IP::Addr> Range;
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typedef RangePartitionType<IP::Addr> RangePartition;
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}
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}
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#endif
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