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
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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/>.
+
+// Class that encapsulates the definition of an OSI layer.
+
+#ifndef OPENVPN_TUN_LAYER_H
+#define OPENVPN_TUN_LAYER_H
+
+#include <openvpn/common/exception.hpp>
+
+namespace openvpn {
+  class Layer
+  {
+  public:
+    enum Type {
+      NONE,
+      OSI_LAYER_2,
+      OSI_LAYER_3,
+    };
+
+    Layer() : type_(NONE) {}
+    explicit Layer(const Type t) : type_(t) {}
+    Type operator()() const { return type_; }
+
+    bool defined() const
+    {
+      return type_ != NONE;
+    }
+
+    const char *dev_type() const
+    {
+      switch (type_)
+	{
+	case OSI_LAYER_2:
+	  return "tap";
+	case OSI_LAYER_3:
+	  return "tun";
+	default:
+	  return "null";
+	}
+    }
+
+    const char *str() const
+    {
+      switch (type_)
+	{
+	case NONE:
+	  return "UNDEF_LAYER";
+	case OSI_LAYER_2:
+	  return "OSI_LAYER_2";
+	case OSI_LAYER_3:
+	  return "OSI_LAYER_3";
+	default:
+	  throw Exception("Layer: unrecognized layer type");
+	}
+    }
+
+    int value() const
+    {
+      switch (type_)
+	{
+	case NONE:
+	  return 0;
+	case OSI_LAYER_2:
+	  return 2;
+	case OSI_LAYER_3:
+	  return 3;
+	default:
+	  throw Exception("Layer: unrecognized layer type");
+	}
+    }
+
+    static Layer from_str(const std::string& str)
+    {
+      if (str == "OSI_LAYER_3")
+	return Layer(OSI_LAYER_3);
+      else if (str == "OSI_LAYER_2")
+	return Layer(OSI_LAYER_2);
+      else if (str == "UNDEF_LAYER")
+	return Layer(NONE);
+      else
+	throw Exception("Layer: unrecognized layer string");
+    }
+
+    static Layer from_value(const int value)
+    {
+      if (value == 3)
+	return Layer(OSI_LAYER_3);
+      else if (value == 2)
+	return Layer(OSI_LAYER_2);
+      else if (value == 0)
+	return Layer(NONE);
+      else
+	throw Exception("Layer: unrecognized layer value");
+    }
+
+    bool operator==(const Layer& other) const
+    {
+      return type_ == other.type_;
+    }
+
+    bool operator!=(const Layer& other) const
+    {
+      return type_ != other.type_;
+    }
+
+  private:
+    Type type_;
+  };
+} // namespace openvpn
+
+#endif // OPENVPN_TUN_LAYER_H