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1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-present The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #ifndef BITCOIN_NET_PROCESSING_H
7 : : #define BITCOIN_NET_PROCESSING_H
8 : :
9 : : #include <consensus/amount.h>
10 : : #include <net.h>
11 : : #include <node/txorphanage.h>
12 : : #include <private_broadcast.h>
13 : : #include <protocol.h>
14 : : #include <threadsafety.h>
15 : : #include <uint256.h>
16 : : #include <util/expected.h>
17 : : #include <validationinterface.h>
18 : :
19 : : #include <atomic>
20 : : #include <chrono>
21 : : #include <cstdint>
22 : : #include <memory>
23 : : #include <optional>
24 : : #include <string>
25 : : #include <vector>
26 : :
27 : : class AddrMan;
28 : : class CTxMemPool;
29 : : class ChainstateManager;
30 : : class BanMan;
31 : : class CBlockIndex;
32 : : class CScheduler;
33 : : class DataStream;
34 : : class uint256;
35 : :
36 : : namespace node {
37 : : class Warnings;
38 : : } // namespace node
39 : :
40 : : /** Whether transaction reconciliation protocol should be enabled by default. */
41 : : static constexpr bool DEFAULT_TXRECONCILIATION_ENABLE{false};
42 : : /** Default number of non-mempool transactions to keep around for block reconstruction. Includes
43 : : orphan, replaced, and rejected transactions. */
44 : : static const uint32_t DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN{100};
45 : : static const bool DEFAULT_PEERBLOOMFILTERS = false;
46 : : static const bool DEFAULT_PEERBLOCKFILTERS = false;
47 : : /** Maximum number of outstanding CMPCTBLOCK requests for the same block. */
48 : : static const unsigned int MAX_CMPCTBLOCKS_INFLIGHT_PER_BLOCK = 3;
49 : : /** Number of headers sent in one getheaders result. We rely on the assumption that if a peer sends
50 : : * less than this number, we reached its tip. Changing this value is a protocol upgrade. */
51 : : static const unsigned int MAX_HEADERS_RESULTS = 2000;
52 : :
53 [ + - ]: 2 : struct CNodeStateStats {
54 : : int nSyncHeight = -1;
55 : : int nCommonHeight = -1;
56 : : int m_starting_height = -1;
57 : : std::chrono::microseconds m_ping_wait;
58 : : std::vector<int> vHeightInFlight;
59 : : bool m_relay_txs;
60 : : int m_inv_to_send = 0;
61 : : uint64_t m_last_inv_seq{0};
62 : : CAmount m_fee_filter_received;
63 : : uint64_t m_addr_processed = 0;
64 : : uint64_t m_addr_rate_limited = 0;
65 : : bool m_addr_relay_enabled{false};
66 : : ServiceFlags their_services;
67 : : int64_t presync_height{-1};
68 : : std::chrono::seconds time_offset{0};
69 : : };
70 : :
71 : : struct PeerManagerInfo {
72 : : std::chrono::seconds median_outbound_time_offset{0s};
73 : : bool ignores_incoming_txs{false};
74 : : };
75 : :
76 : 187 : class PeerManager : public CValidationInterface, public NetEventsInterface
77 : : {
78 : : public:
79 : : struct Options {
80 : : //! Whether this node is running in -blocksonly mode
81 : : bool ignore_incoming_txs{DEFAULT_BLOCKSONLY};
82 : : //! Whether transaction reconciliation protocol is enabled
83 : : bool reconcile_txs{DEFAULT_TXRECONCILIATION_ENABLE};
84 : : //! Number of non-mempool transactions to keep around for block reconstruction. Includes
85 : : //! orphan, replaced, and rejected transactions.
86 : : uint32_t max_extra_txs{DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN};
87 : : //! Whether all P2P messages are captured to disk
88 : : bool capture_messages{false};
89 : : //! Whether or not the internal RNG behaves deterministically (this is
90 : : //! a test-only option).
91 : : bool deterministic_rng{false};
92 : : //! Number of headers sent in one getheaders message result (this is
93 : : //! a test-only option).
94 : : uint32_t max_headers_result{MAX_HEADERS_RESULTS};
95 : : //! Whether private broadcast is used for sending transactions.
96 : : bool private_broadcast{DEFAULT_PRIVATE_BROADCAST};
97 : : };
98 : :
99 : : static std::unique_ptr<PeerManager> make(CConnman& connman, AddrMan& addrman,
100 : : BanMan* banman, ChainstateManager& chainman,
101 : : CTxMemPool& pool, node::Warnings& warnings, Options opts);
102 : 0 : virtual ~PeerManager() = default;
103 : :
104 : : /**
105 : : * Attempt to manually fetch block from a given peer. We must already have the header.
106 : : *
107 : : * @param[in] peer_id The peer id
108 : : * @param[in] block_index The blockindex
109 : : */
110 : : virtual util::Expected<void, std::string> FetchBlock(NodeId peer_id, const CBlockIndex& block_index) = 0;
111 : :
112 : : /** Begin running background tasks, should only be called once */
113 : : virtual void StartScheduledTasks(CScheduler& scheduler) = 0;
114 : :
115 : : /** Get statistics from node state */
116 : : virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) const = 0;
117 : :
118 : : virtual std::vector<node::TxOrphanage::OrphanInfo> GetOrphanTransactions() = 0;
119 : :
120 : : /** Get peer manager info. */
121 : : virtual PeerManagerInfo GetInfo() const = 0;
122 : :
123 : : /** Get info about transactions currently being privately broadcast. */
124 : : virtual std::vector<PrivateBroadcast::TxBroadcastInfo> GetPrivateBroadcastInfo() const = 0;
125 : :
126 : : /**
127 : : * Abort private broadcast attempts for transactions currently being privately broadcast.
128 : : *
129 : : * @param[in] id A transaction identifier. It will be matched against both txid and wtxid for
130 : : * all transactions in the private broadcast queue.
131 : : *
132 : : * @return Transactions removed from the private broadcast queue. If the provided id matches a
133 : : * txid that corresponds to multiple transactions with different wtxids, multiple
134 : : * transactions may be returned.
135 : : */
136 : : virtual std::vector<CTransactionRef> AbortPrivateBroadcast(const uint256& id) = 0;
137 : :
138 : : /**
139 : : * Initiate a transaction broadcast to eligible peers.
140 : : * Queue the witness transaction id to `Peer::TxRelay::m_tx_inventory_to_send`
141 : : * for each peer. Later, depending on `Peer::TxRelay::m_next_inv_send_time` and if
142 : : * the transaction is in the mempool, an `INV` about it may be sent to the peer.
143 : : */
144 : : virtual void InitiateTxBroadcastToAll(const Txid& txid, const Wtxid& wtxid) = 0;
145 : :
146 : : /**
147 : : * Initiate a private transaction broadcast. This is done
148 : : * asynchronously via short-lived connections to peers on privacy networks.
149 : : */
150 : : virtual void InitiateTxBroadcastPrivate(const CTransactionRef& tx) = 0;
151 : :
152 : : /** Send ping message to all peers */
153 : : virtual void SendPings() = 0;
154 : :
155 : : /** Set the height of the best block and its time (seconds since epoch). */
156 : : virtual void SetBestBlock(int height, std::chrono::seconds time) = 0;
157 : :
158 : : /* Public for unit testing. */
159 : : virtual void UnitTestMisbehaving(NodeId peer_id) = 0;
160 : :
161 : : /**
162 : : * Evict extra outbound peers. If we think our tip may be stale, connect to an extra outbound.
163 : : * Public for unit testing.
164 : : */
165 : : virtual void CheckForStaleTipAndEvictPeers() = 0;
166 : :
167 : : /** This function is used for testing the stale tip eviction logic, see denialofservice_tests.cpp */
168 : : virtual void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds) = 0;
169 : :
170 : : /**
171 : : * Gets the set of service flags which are "desirable" for a given peer.
172 : : *
173 : : * These are the flags which are required for a peer to support for them
174 : : * to be "interesting" to us, ie for us to wish to use one of our few
175 : : * outbound connection slots for or for us to wish to prioritize keeping
176 : : * their connection around.
177 : : *
178 : : * Relevant service flags may be peer- and state-specific in that the
179 : : * version of the peer may determine which flags are required (eg in the
180 : : * case of NODE_NETWORK_LIMITED where we seek out NODE_NETWORK peers
181 : : * unless they set NODE_NETWORK_LIMITED and we are out of IBD, in which
182 : : * case NODE_NETWORK_LIMITED suffices).
183 : : *
184 : : * Thus, generally, avoid calling with 'services' == NODE_NONE, unless
185 : : * state-specific flags must absolutely be avoided. When called with
186 : : * 'services' == NODE_NONE, the returned desirable service flags are
187 : : * guaranteed to not change dependent on state - ie they are suitable for
188 : : * use when describing peers which we know to be desirable, but for which
189 : : * we do not have a confirmed set of service flags.
190 : : */
191 : : virtual ServiceFlags GetDesirableServiceFlags(ServiceFlags services) const = 0;
192 : : };
193 : :
194 : : #endif // BITCOIN_NET_PROCESSING_H
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