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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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_NET_PROCESSING_H
#define BITCOIN_NET_PROCESSING_H
#include <consensus/params.h>
#include <net.h>
#include <sync.h>
#include <txrequest.h>
#include <validationinterface.h>
class BlockTransactionsRequest;
class BlockValidationState;
class CBlockHeader;
class CChainParams;
class CTxMemPool;
class ChainstateManager;
class TxValidationState;
extern RecursiveMutex cs_main;
extern RecursiveMutex g_cs_orphans;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
static const bool DEFAULT_PEERBLOOMFILTERS = false;
static const bool DEFAULT_PEERBLOCKFILTERS = false;
/** Threshold for marking a node to be discouraged, e.g. disconnected and added to the discouragement filter. */
static const int DISCOURAGEMENT_THRESHOLD{100};
struct CNodeStateStats {
int nSyncHeight = -1;
int nCommonHeight = -1;
int m_starting_height = -1;
std::vector<int> vHeightInFlight;
};
/**
* Data structure for an individual peer. This struct is not protected by
* cs_main since it does not contain validation-critical data.
*
* Memory is owned by shared pointers and this object is destructed when
* the refcount drops to zero.
*
* Mutexes inside this struct must not be held when locking m_peer_mutex.
*
* TODO: move most members from CNodeState to this structure.
* TODO: move remaining application-layer data members from CNode to this structure.
*/
struct Peer {
/** Same id as the CNode object for this peer */
const NodeId m_id{0};
/** Protects misbehavior data members */
Mutex m_misbehavior_mutex;
/** Accumulated misbehavior score for this peer */
int m_misbehavior_score GUARDED_BY(m_misbehavior_mutex){0};
/** Whether this peer should be disconnected and marked as discouraged (unless it has the noban permission). */
bool m_should_discourage GUARDED_BY(m_misbehavior_mutex){false};
/** Protects block inventory data members */
Mutex m_block_inv_mutex;
/** List of blocks that we'll announce via an `inv` message.
* There is no final sorting before sending, as they are always sent
* immediately and in the order requested. */
std::vector<uint256> m_blocks_for_inv_relay GUARDED_BY(m_block_inv_mutex);
/** Unfiltered list of blocks that we'd like to announce via a `headers`
* message. If we can't announce via a `headers` message, we'll fall back to
* announcing via `inv`. */
std::vector<uint256> m_blocks_for_headers_relay GUARDED_BY(m_block_inv_mutex);
/** The final block hash that we sent in an `inv` message to this peer.
* When the peer requests this block, we send an `inv` message to trigger
* the peer to request the next sequence of block hashes.
* Most peers use headers-first syncing, which doesn't use this mechanism */
uint256 m_continuation_block GUARDED_BY(m_block_inv_mutex) {};
/** This peer's reported block height when we connected */
std::atomic<int> m_starting_height{-1};
/** Set of txids to reconsider once their parent transactions have been accepted **/
std::set<uint256> m_orphan_work_set GUARDED_BY(g_cs_orphans);
/** Protects m_getdata_requests **/
Mutex m_getdata_requests_mutex;
/** Work queue of items requested by this peer **/
std::deque<CInv> m_getdata_requests GUARDED_BY(m_getdata_requests_mutex);
explicit Peer(NodeId id) : m_id(id) {}
};
using PeerRef = std::shared_ptr<Peer>;
class PeerManager : public CValidationInterface, public NetEventsInterface
{
public:
static std::unique_ptr<PeerManager> make(const CChainParams& chainparams, CConnman& connman, BanMan* banman,
CScheduler& scheduler, ChainstateManager& chainman, CTxMemPool& pool,
bool ignore_incoming_txs);
virtual ~PeerManager() { }
/** Get statistics from node state */
virtual bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) = 0;
/** Whether this node ignores txs received over p2p. */
virtual bool IgnoresIncomingTxs() = 0;
/** Set the best height */
virtual void SetBestHeight(int height) = 0;
/**
* Increment peer's misbehavior score. If the new value >= DISCOURAGEMENT_THRESHOLD, mark the node
* to be discouraged, meaning the peer might be disconnected and added to the discouragement filter.
* Public for unit testing.
*/
virtual void Misbehaving(const NodeId pnode, const int howmuch, const std::string& message) = 0;
/**
* Evict extra outbound peers. If we think our tip may be stale, connect to an extra outbound.
* Public for unit testing.
*/
virtual void CheckForStaleTipAndEvictPeers() = 0;
/** Process a single message from a peer. Public for fuzz testing */
virtual void ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv,
const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) = 0;
};
class PeerManagerImpl final : public PeerManager
{
public:
PeerManagerImpl(const CChainParams& chainparams, CConnman& connman, BanMan* banman,
CScheduler& scheduler, ChainstateManager& chainman, CTxMemPool& pool,
bool ignore_incoming_txs);
/** Overridden from CValidationInterface. */
void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected) override;
void BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex) override;
void UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) override;
void BlockChecked(const CBlock& block, const BlockValidationState& state) override;
void NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) override;
/** Implement NetEventsInterface */
void InitializeNode(CNode* pnode) override;
void FinalizeNode(const CNode& node, bool& fUpdateConnectionTime) override;
bool ProcessMessages(CNode* pfrom, std::atomic<bool>& interrupt) override;
bool SendMessages(CNode* pto) override EXCLUSIVE_LOCKS_REQUIRED(pto->cs_sendProcessing);
/** Implement PeerManager */
void CheckForStaleTipAndEvictPeers() override;
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats& stats) override;
bool IgnoresIncomingTxs() override { return m_ignore_incoming_txs; }
void SetBestHeight(int height) override { m_best_height = height; };
void Misbehaving(const NodeId pnode, const int howmuch, const std::string& message) override;
void ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv,
const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc) override;
private:
/** Consider evicting an outbound peer based on the amount of time they've been behind our tip */
void ConsiderEviction(CNode& pto, int64_t time_in_seconds) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
/** If we have extra outbound peers, try to disconnect the one with the oldest block announcement */
void EvictExtraOutboundPeers(int64_t time_in_seconds) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
/** Retrieve unbroadcast transactions from the mempool and reattempt sending to peers */
void ReattemptInitialBroadcast(CScheduler& scheduler) const;
/** Get a shared pointer to the Peer object.
* May return an empty shared_ptr if the Peer object can't be found. */
PeerRef GetPeerRef(NodeId id) const;
/** Get a shared pointer to the Peer object and remove it from m_peer_map.
* May return an empty shared_ptr if the Peer object can't be found. */
PeerRef RemovePeer(NodeId id);
/**
* Potentially mark a node discouraged based on the contents of a BlockValidationState object
*
* @param[in] via_compact_block this bool is passed in because net_processing should
* punish peers differently depending on whether the data was provided in a compact
* block message or not. If the compact block had a valid header, but contained invalid
* txs, the peer should not be punished. See BIP 152.
*
* @return Returns true if the peer was punished (probably disconnected)
*/
bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state,
bool via_compact_block, const std::string& message = "");
/**
* Potentially disconnect and discourage a node based on the contents of a TxValidationState object
*
* @return Returns true if the peer was punished (probably disconnected)
*/
bool MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state, const std::string& message = "");
/** Maybe disconnect a peer and discourage future connections from its address.
*
* @param[in] pnode The node to check.
* @return True if the peer was marked for disconnection in this function
*/
bool MaybeDiscourageAndDisconnect(CNode& pnode);
void ProcessOrphanTx(std::set<uint256>& orphan_work_set) EXCLUSIVE_LOCKS_REQUIRED(cs_main, g_cs_orphans);
/** Process a single headers message from a peer. */
void ProcessHeadersMessage(CNode& pfrom, const Peer& peer,
const std::vector<CBlockHeader>& headers,
bool via_compact_block);
void SendBlockTransactions(CNode& pfrom, const CBlock& block, const BlockTransactionsRequest& req);
/** Register with TxRequestTracker that an INV has been received from a
* peer. The announcement parameters are decided in PeerManager and then
* passed to TxRequestTracker. */
void AddTxAnnouncement(const CNode& node, const GenTxid& gtxid, std::chrono::microseconds current_time)
EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
/** Send a version message to a peer */
void PushNodeVersion(CNode& pnode, int64_t nTime);
const CChainParams& m_chainparams;
CConnman& m_connman;
/** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
BanMan* const m_banman;
ChainstateManager& m_chainman;
CTxMemPool& m_mempool;
TxRequestTracker m_txrequest GUARDED_BY(::cs_main);
/** The height of the best chain */
std::atomic<int> m_best_height{-1};
int64_t m_stale_tip_check_time; //!< Next time to check for stale tip
/** Whether this node is running in blocks only mode */
const bool m_ignore_incoming_txs;
/** Whether we've completed initial sync yet, for determining when to turn
* on extra block-relay-only peers. */
bool m_initial_sync_finished{false};
/** Protects m_peer_map. This mutex must not be locked while holding a lock
* on any of the mutexes inside a Peer object. */
mutable Mutex m_peer_mutex;
/**
* Map of all Peer objects, keyed by peer id. This map is protected
* by the m_peer_mutex. Once a shared pointer reference is
* taken, the lock may be released. Individual fields are protected by
* their own locks.
*/
std::map<NodeId, PeerRef> m_peer_map GUARDED_BY(m_peer_mutex);
};
/** Relay transaction to every node */
void RelayTransaction(const uint256& txid, const uint256& wtxid, const CConnman& connman) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
#endif // BITCOIN_NET_PROCESSING_H
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