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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) 2012-2022 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/>.
// A queue of datagram buffers for handling sequences of UDP packets
#ifndef OPENVPN_FRAME_MEMQ_DGRAM_H
#define OPENVPN_FRAME_MEMQ_DGRAM_H
#include <openvpn/common/size.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/buffer/memq.hpp>
#include <openvpn/frame/frame.hpp>
namespace openvpn {
class MemQDgram : public MemQBase
{
public:
OPENVPN_SIMPLE_EXCEPTION(frame_uninitialized);
MemQDgram()
{
}
explicit MemQDgram(const Frame::Ptr &frame)
: frame_(frame)
{
}
void set_frame(const Frame::Ptr &frame)
{
frame_ = frame;
}
size_t pending() const
{
return empty() ? 0 : q.front()->size();
}
void write(const unsigned char *data, size_t size)
{
if (frame_)
{
const Frame::Context &fc = (*frame_)[Frame::READ_BIO_MEMQ_STREAM];
q.push_back(fc.copy(data, size));
length += size;
}
else
throw frame_uninitialized();
}
size_t read(unsigned char *data, size_t len)
{
BufferPtr &b = q.front();
if (len > b->size())
len = b->size();
b->read(data, len);
if (b->empty())
q.pop_front();
length -= len;
return len;
}
private:
Frame::Ptr frame_;
};
} // namespace openvpn
#endif // OPENVPN_FRAME_MEMQ_DGRAM_H
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