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https://github.com/OpenVPN/openvpn3.git
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8c8e96e138
In the code base three different syntaxes for overriding virtual member functions could be found: 1) virtual ... override 2) virtual ... 3) ... override This converts all of them to the third syntax, as recommended by the ISO C++ core guidelines in C.128 Signed-off-by: Heiko Hund <heiko@openvpn.net>
148 lines
4.1 KiB
C++
148 lines
4.1 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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// This is a "stub" compression object. It acts like a compressor
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// in the sense that it plays along with compression framing in
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// the OpenVPN protocol, but it always sends packets with NO_COMPRESS
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// or NO_COMPRESS_SWAP compression status. While it's not designed
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// to receive compressed packets, it will try to handle received LZO
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// packets, but it will never send compressed packets.
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#ifndef OPENVPN_COMPRESS_COMPSTUB_H
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#define OPENVPN_COMPRESS_COMPSTUB_H
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#ifndef NO_LZO
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#include <openvpn/compress/lzoselect.hpp>
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#endif
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namespace openvpn {
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class CompressStub : public Compress
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{
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public:
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CompressStub(const Frame::Ptr &frame, const SessionStats::Ptr &stats, const bool support_swap_arg)
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: Compress(frame, stats),
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support_swap(support_swap_arg)
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#ifndef NO_LZO
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,
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lzo(frame, stats, false, true)
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#endif
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{
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OVPN_LOG_INFO("Comp-stub init swap=" << support_swap_arg);
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}
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const char *name() const override
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{
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return "stub";
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}
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void compress(BufferAllocated &buf, const bool hint) override
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{
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// skip null packets
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if (!buf.size())
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return;
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// indicate that we didn't compress
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if (support_swap)
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do_swap(buf, NO_COMPRESS_SWAP);
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else
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buf.push_front(NO_COMPRESS);
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}
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void decompress(BufferAllocated &buf) override
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{
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// skip null packets
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if (!buf.size())
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return;
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const unsigned char c = buf.pop_front();
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switch (c)
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{
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case NO_COMPRESS_SWAP:
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do_unswap(buf);
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case NO_COMPRESS:
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break;
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#ifndef NO_LZO
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// special mode to support older servers that ignore
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// compression handshake -- this will handle receiving
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// compressed packets even if we didn't ask for them
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case CompressLZO::LZO_COMPRESS:
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OVPN_LOG_VERBOSE("CompressStub: handled unsolicited LZO packet");
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lzo.decompress_work(buf);
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break;
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#endif
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default:
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OVPN_LOG_VERBOSE("CompressStub: unable to handle op=" << int(c));
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error(buf);
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}
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}
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private:
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const bool support_swap;
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#ifndef NO_LZO
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CompressLZO lzo;
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#endif
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};
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// Compression stub using V2 protocol
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class CompressStubV2 : public Compress
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{
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public:
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CompressStubV2(const Frame::Ptr &frame, const SessionStats::Ptr &stats)
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: Compress(frame, stats)
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{
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OVPN_LOG_INFO("Comp-stubV2 init");
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}
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const char *name() const override
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{
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return "stubv2";
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}
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void compress(BufferAllocated &buf, const bool hint) override
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{
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// skip null packets
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if (!buf.size())
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return;
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// indicate that we didn't compress
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v2_push(buf, OVPN_COMPv2_NONE);
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}
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void decompress(BufferAllocated &buf) override
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{
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// skip null packets
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if (!buf.size())
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return;
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const int cop = v2_pull(buf);
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if (cop)
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{
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OVPN_LOG_VERBOSE("CompressStubV2: unable to handle op=" << cop);
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error(buf);
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}
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}
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};
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} // namespace openvpn
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#endif // OPENVPN_COMPRESS_COMPSTUB_H
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