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71 lines
2.4 KiB
71 lines
2.4 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2019 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_BANMAN_H
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#define BITCOIN_BANMAN_H
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#include <cstdint>
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#include <memory>
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#include <addrdb.h>
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#include <fs.h>
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#include <net_types.h> // For banmap_t
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#include <sync.h>
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// NOTE: When adjusting this, update rpcnet:setban's help ("24h")
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static constexpr unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24; // Default 24-hour ban
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class CClientUIInterface;
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class CNetAddr;
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class CSubNet;
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// Denial-of-service detection/prevention
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// The idea is to detect peers that are behaving
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// badly and disconnect/ban them, but do it in a
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// one-coding-mistake-won't-shatter-the-entire-network
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// way.
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// IMPORTANT: There should be nothing I can give a
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// node that it will forward on that will make that
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// node's peers drop it. If there is, an attacker
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// can isolate a node and/or try to split the network.
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// Dropping a node for sending stuff that is invalid
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// now but might be valid in a later version is also
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// dangerous, because it can cause a network split
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// between nodes running old code and nodes running
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// new code.
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class BanMan
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{
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public:
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~BanMan();
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BanMan(fs::path ban_file, CClientUIInterface* client_interface, int64_t default_ban_time);
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void Ban(const CNetAddr& net_addr, const BanReason& ban_reason, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
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void Ban(const CSubNet& sub_net, const BanReason& ban_reason, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
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void ClearBanned();
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int IsBannedLevel(CNetAddr net_addr);
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bool IsBanned(CNetAddr net_addr);
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bool IsBanned(CSubNet sub_net);
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bool Unban(const CNetAddr& net_addr);
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bool Unban(const CSubNet& sub_net);
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void GetBanned(banmap_t& banmap);
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void DumpBanlist();
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private:
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void SetBanned(const banmap_t& banmap);
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bool BannedSetIsDirty();
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//!set the "dirty" flag for the banlist
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void SetBannedSetDirty(bool dirty = true);
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//!clean unused entries (if bantime has expired)
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void SweepBanned();
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CCriticalSection m_cs_banned;
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banmap_t m_banned GUARDED_BY(m_cs_banned);
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bool m_is_dirty GUARDED_BY(m_cs_banned);
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CClientUIInterface* m_client_interface = nullptr;
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CBanDB m_ban_db;
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const int64_t m_default_ban_time;
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};
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#endif
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