mirror of
https://github.com/deneraraujo/OpenVPNAdapter.git
synced 2026-02-11 00:00:08 +08:00
81 lines
3.0 KiB
C++
81 lines
3.0 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) 2012-2017 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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// Method to generate a Frame object for typical OpenVPN usage
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#ifndef OPENVPN_FRAME_FRAME_INIT_H
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#define OPENVPN_FRAME_FRAME_INIT_H
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#include <algorithm>
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#include <openvpn/frame/frame.hpp>
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namespace openvpn {
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inline Frame::Ptr frame_init(const bool align_adjust_3_1,
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const size_t tun_mtu,
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const size_t control_channel_payload,
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const bool verbose)
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{
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const size_t payload = std::max(tun_mtu + 512, size_t(2048));
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const size_t headroom = 512;
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const size_t tailroom = 512;
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const size_t align_block = 16;
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const unsigned int buffer_flags = 0;
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Frame::Ptr frame(new Frame(Frame::Context(headroom, payload, tailroom, 0, align_block, buffer_flags)));
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if (align_adjust_3_1)
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{
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(*frame)[Frame::READ_LINK_TCP] = Frame::Context(headroom, payload, tailroom, 3, align_block, buffer_flags);
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(*frame)[Frame::READ_LINK_UDP] = Frame::Context(headroom, payload, tailroom, 1, align_block, buffer_flags);
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}
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(*frame)[Frame::READ_BIO_MEMQ_STREAM] = Frame::Context(headroom, std::min(control_channel_payload, payload),
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tailroom, 0, align_block, buffer_flags);
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(*frame)[Frame::WRITE_SSL_CLEARTEXT] = Frame::Context(headroom, payload, tailroom, 0, align_block, BufferAllocated::GROW);
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frame->standardize_capacity(~0);
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if (verbose)
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OPENVPN_LOG("Frame=" << headroom << '/' << payload << '/' << tailroom
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<< " mssfix-ctrl=" << (*frame)[Frame::READ_BIO_MEMQ_STREAM].payload());
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return frame;
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}
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inline Frame::Context frame_init_context_simple(const size_t payload)
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{
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const size_t headroom = 512;
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const size_t tailroom = 512;
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const size_t align_block = 16;
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const unsigned int buffer_flags = 0;
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return Frame::Context(headroom, payload, tailroom, 0, align_block, buffer_flags);
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}
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inline Frame::Ptr frame_init_simple(const size_t payload)
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{
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Frame::Ptr frame = new Frame(frame_init_context_simple(payload));
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frame->standardize_capacity(~0);
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return frame;
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}
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} // namespace openvpn
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#endif // OPENVPN_FRAME_FRAME_INIT_H
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