forked from premiere/premiere-libtorrent
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/*
|
|
|
|
Copyright (c) 2006-2016, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef TORRENT_DHT_DOS_BLOCKER
|
|
#define TORRENT_DHT_DOS_BLOCKER
|
|
|
|
#include "libtorrent/config.hpp"
|
|
#include "libtorrent/time.hpp"
|
|
#include "libtorrent/address.hpp"
|
|
#include "libtorrent/assert.hpp"
|
|
|
|
namespace libtorrent { namespace dht
|
|
{
|
|
|
|
struct dht_logger;
|
|
|
|
// this is a class that maintains a list of abusive DHT nodes,
|
|
// blocking their access to our DHT node.
|
|
struct TORRENT_EXTRA_EXPORT dos_blocker
|
|
{
|
|
dos_blocker();
|
|
|
|
// called every time we receive an incoming packet. Returns
|
|
// true if we should let the packet through, and false if
|
|
// it's blocked
|
|
bool incoming(address addr, time_point now, dht_logger* logger);
|
|
|
|
void set_rate_limit(int l)
|
|
{
|
|
TORRENT_ASSERT(l > 0);
|
|
m_message_rate_limit = l;
|
|
}
|
|
|
|
void set_block_timer(int t)
|
|
{
|
|
TORRENT_ASSERT(t > 0);
|
|
m_block_timeout = t;
|
|
}
|
|
|
|
private:
|
|
|
|
// used to ignore abusive dht nodes
|
|
struct node_ban_entry
|
|
{
|
|
node_ban_entry(): count(0) {}
|
|
address src;
|
|
time_point limit;
|
|
int count;
|
|
};
|
|
|
|
enum { num_ban_nodes = 20 };
|
|
|
|
// the max number of packets we can receive per second from a node before
|
|
// we block it.
|
|
int m_message_rate_limit;
|
|
|
|
// the number of seconds a node gets blocked for when it exceeds the rate
|
|
// limit
|
|
int m_block_timeout;
|
|
|
|
node_ban_entry m_ban_nodes[num_ban_nodes];
|
|
};
|
|
}}
|
|
|
|
#endif
|
|
|