mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 04:02:15 +02:00
ef8da98bd4
Rename BufferAllocated --> BufferAllocatedRc Buffer: split RC from BufferAllocated Also make changes as needed where BufferAllocated is used Buffer: Split allocation flags into own struct Leaving flags in template causes each alias to have identical flags by different names, which requires each type to pointlessly use the nested name. Make RC: Clean up headers buffer.hpp, make_rc.hpp Signed-off-by: Charlie Vigue <charlie.vigue@openvpn.com>
120 lines
3.6 KiB
C++
120 lines
3.6 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// A queue of buffers for handling streamed data such as data received
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// from or to be sent to a TCP socket
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#ifndef OPENVPN_FRAME_MEMQ_STREAM_H
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#define OPENVPN_FRAME_MEMQ_STREAM_H
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#include <algorithm>
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#include <openvpn/common/size.hpp>
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#include <openvpn/common/exception.hpp>
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#include <openvpn/buffer/memq.hpp>
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#include <openvpn/frame/frame.hpp>
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namespace openvpn {
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class MemQStream : public MemQBase
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{
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public:
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OPENVPN_SIMPLE_EXCEPTION(frame_uninitialized);
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MemQStream()
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{
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}
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explicit MemQStream(const Frame::Ptr &frame)
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: frame_(frame)
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{
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}
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void set_frame(const Frame::Ptr &frame)
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{
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frame_ = frame;
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}
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size_t pending() const
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{
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return total_length();
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}
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void write(const unsigned char *data, size_t size)
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{
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if (frame_)
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{
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const Frame::Context &fc = (*frame_)[Frame::READ_BIO_MEMQ_STREAM];
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if (size)
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{
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ConstBuffer b(data, size, true);
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// Any residual space remaining in most recently pushed buffer?
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if (!q.empty())
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{
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BufferPtr &qb = q.back();
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const size_t write_size = std::min(b.size(), fc.remaining_payload(*qb));
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const unsigned char *from = b.read_alloc(write_size);
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qb->write(from, write_size);
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length += write_size;
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}
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// Start a new buffer
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while (b.size())
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{
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auto newbuf = BufferAllocatedRc::Create();
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fc.prepare(*newbuf);
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const size_t write_size = std::min(b.size(), fc.payload());
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const unsigned char *from = b.read_alloc(write_size);
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newbuf->write(from, write_size);
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q.push_back(newbuf);
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length += write_size;
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}
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}
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}
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else
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throw frame_uninitialized();
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}
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size_t read(unsigned char *data, size_t len)
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{
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Buffer b(data, len, false);
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while (!q.empty())
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{
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const size_t remaining = b.remaining();
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if (!remaining)
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break;
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BufferPtr &qf = q.front();
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const size_t read_size = std::min(remaining, qf->size());
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unsigned char *to = b.write_alloc(read_size);
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qf->read(to, read_size);
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length -= read_size;
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if (qf->empty())
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q.pop_front();
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}
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return b.size();
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}
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private:
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Frame::Ptr frame_;
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};
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} // namespace openvpn
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#endif // OPENVPN_FRAME_MEMQ_STREAM_H
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