Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

2026-04-24 00:00:05 +08:00 · 2020-02-24 14:43:11 +03:00
parent 133b3756e6 86cc97e55f
commit 32f1555929
655 changed files with 146468 additions and 0 deletions
@@ -0,0 +1,137 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_ADDR_RANGE_H
+#define OPENVPN_ADDR_RANGE_H
+
+#include <string>
+#include <sstream>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+
+#include <openvpn/addr/ip.hpp>
+
+namespace openvpn {
+  namespace IP {
+
+    // Denote a range of IP addresses with a start and extent,
+    // where A represents an address class.
+    // A should be a network address class such as IP::Addr, IPv4::Addr, or IPv6::Addr.
+
+    template <typename ADDR>
+    class RangeType
+    {
+    public:
+      class Iterator
+      {
+	friend class RangeType;
+      public:
+	bool more() const { return remaining_ > 0; }
+
+	const ADDR& addr() const { return addr_; }
+
+	void next()
+	{
+	  if (more())
+	    {
+	      ++addr_;
+	      --remaining_;
+	    }
+	}
+
+      private:
+	Iterator(const RangeType& range)
+	  : addr_(range.start_), remaining_(range.extent_) {}
+
+	ADDR addr_;
+	size_t remaining_;
+      };
+
+      RangeType() : extent_(0) {}
+
+      RangeType(const ADDR& start, const size_t extent)
+	: start_(start), extent_(extent) {}
+
+      Iterator iterator() const { return Iterator(*this); }
+
+      const bool defined() const { return extent_ > 0; }
+      const ADDR& start() const { return start_; }
+      size_t extent() const { return extent_; }
+
+      RangeType pull_front(size_t extent)
+      {
+	if (extent > extent_)
+	  extent = extent_;
+	RangeType ret(start_, extent);
+	start_ += extent;
+	extent_ -= extent;
+	return ret;
+      }
+
+      std::string to_string() const
+      {
+	std::ostringstream os;
+	os << start_.to_string() << '[' << extent_ << ']';
+	return os.str();
+      }
+
+    private:
+      ADDR start_;
+      size_t extent_;
+    };
+
+    template <typename ADDR>
+    class RangePartitionType
+    {
+    public:
+      RangePartitionType(const RangeType<ADDR>& src_range, const size_t n_partitions)
+	: range(src_range),
+	  remaining(n_partitions)
+      {
+      }
+
+      bool next(RangeType<ADDR>& r)
+      {
+	if (remaining)
+	  {
+	    if (remaining > 1)
+	      r = range.pull_front(range.extent() / remaining);
+	    else
+	      r = range;
+	    --remaining;
+	    return r.defined();
+	  }
+	else
+	  return false;
+      }
+
+    private:
+      RangeType<ADDR> range;
+      size_t remaining;
+    };
+
+    typedef RangeType<IP::Addr> Range;
+    typedef RangePartitionType<IP::Addr> RangePartition;
+  }
+}
+
+#endif