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
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+//    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/>.
+
+// Invert a route list.  Used to support excluded routes on platforms that
+// don't support them natively.
+
+#pragma once
+
+#include <openvpn/common/exception.hpp>
+#include <openvpn/addr/route.hpp>
+
+namespace openvpn {
+  namespace IP {
+    class AddressSpaceSplitter : public RouteList
+    {
+    public:
+      OPENVPN_EXCEPTION(address_space_splitter);
+
+      AddressSpaceSplitter() {}
+
+      // NOTE: when passing AddressSpaceSplitter to this constructor, make sure
+      // to static_cast it to RouteList& so as to avoid matching the
+      // default copy constructor.
+      explicit AddressSpaceSplitter(const RouteList& in)
+	: AddressSpaceSplitter(in, in.version_mask())
+      {
+      }
+
+      AddressSpaceSplitter(const RouteList& in, const Addr::VersionMask vermask)
+      {
+	in.verify_canonical();
+	if (vermask & Addr::V4_MASK)
+	  descend(in, Route(Addr::from_zero(Addr::V4), 0));
+	if (vermask & Addr::V6_MASK)
+	  descend(in, Route(Addr::from_zero(Addr::V6), 0));
+      }
+
+    private:
+      enum Type {
+	EQUAL,
+	SUBROUTE,
+	LEAF,
+      };
+      /**
+       * This method construct a non-overlapping list of routes spanning the address
+       * space in @param route.  The routes are constructed in a way that each
+       * route in the returned list is smaller or equalto each route in
+       * parameter @param in
+       *
+       * @param route The route we currently are looking at and split if it does
+       *	      not meet the requirements
+       */
+      void descend(const RouteList& in, const Route& route)
+      {
+	switch (find(in, route))
+	  {
+	  case SUBROUTE:
+	    {
+	      Route r1, r2;
+	      if (route.split(r1, r2))
+		{
+		  descend(in, r1);
+		  descend(in, r2);
+		}
+	      else
+		push_back(route);
+	      break;
+	    }
+	  case EQUAL:
+	  case LEAF:
+	    push_back(route);
+	    break;
+	  }
+      }
+
+      static Type find(const RouteList& in, const Route& route)
+      {
+	Type type = LEAF;
+	for (RouteList::const_iterator i = in.begin(); i != in.end(); ++i)
+	  {
+	    const Route& r = *i;
+	    if (route == r)
+	      type = EQUAL;
+	    else if (route.contains(r))
+	      return SUBROUTE;
+	  }
+	return type;
+      }
+    };
+  }
+}