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101 lines
4.0 KiB
C++
101 lines
4.0 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2020 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 <addrdb.h>
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#include <common/bloom.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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#include <chrono>
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#include <cstdint>
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#include <memory>
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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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/// How often to dump banned addresses/subnets to disk.
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static constexpr std::chrono::minutes DUMP_BANS_INTERVAL{15};
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class CClientUIInterface;
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class CNetAddr;
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class CSubNet;
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// Banman manages two related but distinct concepts:
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//
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// 1. Banning. This is configured manually by the user, through the setban RPC.
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// If an address or subnet is banned, we never accept incoming connections from
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// it and never create outgoing connections to it. We won't gossip its address
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// to other peers in addr messages. Banned addresses and subnets are stored to
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// disk on shutdown and reloaded on startup. Banning can be used to
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// prevent connections with spy nodes or other griefers.
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//
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// 2. Discouragement. If a peer misbehaves enough (see Misbehaving() in
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// net_processing.cpp), we'll mark that address as discouraged. We still allow
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// incoming connections from them, but they're preferred for eviction when
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// we receive new incoming connections. We never make outgoing connections to
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// them, and do not gossip their address to other peers. This is implemented as
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// a bloom filter. We can (probabilistically) test for membership, but can't
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// list all discouraged addresses or unmark them as discouraged. Discouragement
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// can prevent our limited connection slots being used up by incompatible
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// or broken peers.
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//
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// Neither banning nor discouragement are protections against denial-of-service
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// attacks, since if an attacker has a way to waste our resources and we
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// disconnect from them and ban that address, it's trivial for them to
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// reconnect from another IP address.
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//
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// Attempting to automatically disconnect or ban any class of peer carries the
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// risk of splitting the network. For example, if we banned/disconnected for a
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// transaction that fails a policy check and a future version changes the
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// policy check so the transaction is accepted, then that transaction could
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// cause the network to split between old nodes and new nodes.
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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, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
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void Ban(const CSubNet& sub_net, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
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void Discourage(const CNetAddr& net_addr);
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void ClearBanned();
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void ClearDiscouraged();
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//! Return whether net_addr is banned
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bool IsBanned(const CNetAddr& net_addr);
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//! Return whether sub_net is exactly banned
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bool IsBanned(const CSubNet& sub_net);
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//! Return whether net_addr is discouraged.
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bool IsDiscouraged(const CNetAddr& net_addr);
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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 LoadBanlist() EXCLUSIVE_LOCKS_REQUIRED(!m_cs_banned);
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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() EXCLUSIVE_LOCKS_REQUIRED(m_cs_banned);
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RecursiveMutex 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){false};
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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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CRollingBloomFilter m_discouraged GUARDED_BY(m_cs_banned) {50000, 0.000001};
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};
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#endif // BITCOIN_BANMAN_H
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