mirror of
https://github.com/OpenVPN/openvpn3.git
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e7a5d9f55b
general-purpose classes. Rename ProtoStats to SessionStats and make it more flexible by using an abstract base class model. Add a client event queue for the beginnings of a client-backend API. Added logic to ProtoContext to invalidate session on certain kinds of errors in TCP that would be normally be okay in UDP such as HMAC_ERROR, DECRYPT_ERROR, etc. Add some alignment adjustment logic for READ_LINK_TCP (3 bytes) and READ_LINK_UDP (1 byte).
138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
#ifndef OPENVPN_COMPRESS_LZO_H
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#define OPENVPN_COMPRESS_LZO_H
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// Implement LZO compression.
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// Should only be included by compress.hpp
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#include "lzo/lzoutil.h"
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#include "lzo/lzo1x.h"
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namespace openvpn {
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class CompressLZO : public Compress
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{
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// magic number for LZO compression
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enum {
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LZO_COMPRESS = 0x66,
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LZO_COMPRESS_SWAP = 0x67,
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};
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public:
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OPENVPN_SIMPLE_EXCEPTION(lzo_init_failed);
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CompressLZO(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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{
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lzo_workspace.init(LZO1X_1_15_MEM_COMPRESS, BufferAllocated::ARRAY);
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}
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static void init_static()
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{
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if (::lzo_init() != LZO_E_OK)
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throw lzo_init_failed();
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}
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private:
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virtual void compress(BufferAllocated& buf, const bool hint)
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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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if (hint)
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{
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// initialize work buffer
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frame->prepare(Frame::COMPRESS_WORK, work);
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// verify that input data length is not too large
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if (lzo_extra_buffer(buf.size()) > work.max_size())
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{
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error(buf);
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return;
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}
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// do compress
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lzo_uint zlen = 0;
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const int err = ::lzo1x_1_15_compress(buf.c_data(), buf.size(), work.data(), &zlen, lzo_workspace.data());
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// check for errors
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if (err != LZO_E_OK)
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{
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error(buf);
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return;
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}
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// did compression actually reduce data length?
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if (zlen < buf.size())
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{
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work.set_size(zlen);
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if (support_swap)
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do_swap(work, LZO_COMPRESS_SWAP);
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else
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work.push_front(LZO_COMPRESS);
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buf.swap(work);
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OPENVPN_LOG_COMPRESS("LZO compress");
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return;
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}
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}
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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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virtual void decompress(BufferAllocated& buf)
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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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case LZO_COMPRESS_SWAP:
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do_unswap(buf);
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case LZO_COMPRESS:
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{
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// initialize work buffer
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lzo_uint zlen = frame->prepare(Frame::DECOMPRESS_WORK, work);
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// do uncompress
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const int err = lzo1x_decompress_safe(buf.c_data(), buf.size(), work.data(), &zlen, lzo_workspace.data());
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if (err != LZO_E_OK)
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{
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error(buf);
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break;
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}
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work.set_size(zlen);
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buf.swap(work);
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OPENVPN_LOG_COMPRESS("LZO uncompress");
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}
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break;
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default:
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error(buf); // unknown op
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}
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}
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// worst case size expansion on compress
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size_t lzo_extra_buffer(const size_t len)
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{
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return len + len/8 + 128 + 3;
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}
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const bool support_swap;
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BufferAllocated work;
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BufferAllocated lzo_workspace;
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};
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} // namespace openvpn
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#endif // OPENVPN_COMPRESS_LZO_H
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