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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- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
#ifndef OPENVPN_BUFFER_BUFLIMIT_H
#define OPENVPN_BUFFER_BUFLIMIT_H
#include <openvpn/buffer/buffer.hpp>
namespace openvpn {
template <typename T>
class BufferLimit
{
public:
BufferLimit()
{
set_max(0, 0);
reset();
}
BufferLimit(const T max_lines_arg,
const T max_bytes_arg)
{
set_max(max_lines_arg, max_bytes_arg);
reset();
}
virtual ~BufferLimit() = default;
void set_max(const T max_lines_arg,
const T max_bytes_arg)
{
max_lines = max_lines_arg;
max_bytes = max_bytes_arg;
}
void reset()
{
n_bytes = n_lines = 0;
}
void add(const Buffer &buf)
{
T size = (T)buf.size();
n_bytes += size;
if (max_bytes && n_bytes > max_bytes)
bytes_exceeded();
if (max_lines)
{
const unsigned char *p = buf.c_data();
while (size--)
{
const unsigned char c = *p++;
if (c == '\n')
{
++n_lines;
if (n_lines > max_lines)
lines_exceeded();
}
}
}
}
virtual void bytes_exceeded() = 0;
virtual void lines_exceeded() = 0;
protected:
T max_lines;
T max_bytes;
T n_bytes;
T n_lines;
};
} // namespace openvpn
#endif
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