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/>.
+
+// Receiver side of reliability layer
+
+#ifndef OPENVPN_RELIABLE_RELRECV_H
+#define OPENVPN_RELIABLE_RELRECV_H
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/common/exception.hpp>
+#include <openvpn/common/msgwin.hpp>
+#include <openvpn/reliable/relcommon.hpp>
+
+namespace openvpn {
+
+  template <typename PACKET>
+  class ReliableRecvTemplate
+  {
+  public:
+    OPENVPN_SIMPLE_EXCEPTION(rel_next_sequenced_not_ready);
+
+    typedef reliable::id_t id_t;
+
+    class Message : public ReliableMessageBase<PACKET>
+    {
+      friend class ReliableRecvTemplate;
+    };
+
+    ReliableRecvTemplate() {}
+    ReliableRecvTemplate(const id_t span) { init(span); }
+
+    void init(const id_t span)
+    {
+      window_.init(0, span);
+    }
+
+    // Call with unsequenced packet off of the wire.
+    // Will return receive flags below.
+    enum {
+      ACK_TO_SENDER = (1<<0), // ACK for this packet should be returned to sender
+      IN_WINDOW = (1<<1)      // Packet is in-window (otherwise, packet is dropped)
+    };
+    unsigned int receive(const PACKET& packet, const id_t id)
+    {
+      if (window_.in_window(id))
+	{
+	  Message& m = window_.ref_by_id(id);
+	  m.id_ = id;
+	  m.packet = packet;
+	  return ACK_TO_SENDER|IN_WINDOW;
+	}
+      else
+	return window_.pre_window(id) ? ACK_TO_SENDER : 0;
+    }
+
+    // Return true if next_sequenced() is ready to return next message
+    bool ready() const { return window_.head_defined(); }
+
+    // Return next message in sequence.
+    // Requires that ready() returns true.
+    Message& next_sequenced()
+    {
+      return window_.ref_head();
+    }
+
+    // Call after message returned by receive is ready to
+    // be disposed of.
+    void advance()
+    {
+      window_.rm_head_nocheck();
+    }
+
+  private:
+    MessageWindow<Message, id_t> window_;
+  };
+
+} // namespace openvpn
+
+#endif // OPENVPN_RELIABLE_RELRECV_H