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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_BANMAN_H
#define BITCOIN_BANMAN_H
#include <cstdint>
#include <memory>
#include <addrdb.h>
#include <fs.h>
#include <sync.h>
// NOTE: When adjusting this, update rpcnet:setban's help ("24h")
static constexpr unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24; // Default 24-hour ban
class CClientUIInterface;
class CNetAddr;
class CSubNet;
// Denial-of-service detection/prevention
// The idea is to detect peers that are behaving
// badly and disconnect/ban them, but do it in a
// one-coding-mistake-won't-shatter-the-entire-network
// way.
// IMPORTANT: There should be nothing I can give a
// node that it will forward on that will make that
// node's peers drop it. If there is, an attacker
// can isolate a node and/or try to split the network.
// Dropping a node for sending stuff that is invalid
// now but might be valid in a later version is also
// dangerous, because it can cause a network split
// between nodes running old code and nodes running
// new code.
class BanMan
{
public:
~BanMan();
BanMan(fs::path ban_file, CClientUIInterface* client_interface, int64_t default_ban_time);
void Ban(const CNetAddr& netAddr, const BanReason& banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
void Ban(const CSubNet& subNet, const BanReason& banReason, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
void ClearBanned(); // needed for unit testing
bool IsBanned(CNetAddr netAddr);
bool IsBanned(CSubNet subNet);
bool Unban(const CNetAddr& netAddr);
bool Unban(const CSubNet& subNet);
void GetBanned(banmap_t& banMap);
void DumpBanlist();
private:
void SetBanned(const banmap_t& banMap);
bool BannedSetIsDirty();
//!set the "dirty" flag for the banlist
void SetBannedSetDirty(bool dirty = true);
//!clean unused entries (if bantime has expired)
void SweepBanned();
banmap_t setBanned;
CCriticalSection cs_setBanned;
bool setBannedIsDirty;
CClientUIInterface* clientInterface = nullptr;
CBanDB m_ban_db;
int64_t m_default_ban_time;
};
extern std::unique_ptr<BanMan> g_banman;
#endif
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