/root/bitcoin/src/test/fuzz/cmpctblock.cpp

Source
// Copyright (c) 2026 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <addrman.h>
#include <blockencodings.h>
#include <chain.h>
#include <chainparams.h>
#include <coins.h>
#include <consensus/amount.h>
#include <consensus/consensus.h>
#include <consensus/merkle.h>
#include <net.h>
#include <net_processing.h>
#include <netmessagemaker.h>
#include <node/blockstorage.h>
#include <policy/truc_policy.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <protocol.h>
#include <script/script.h>
#include <serialize.h>
#include <sync.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/fuzz/util/net.h>
#include <test/util/net.h>
#include <test/util/random.h>
#include <test/util/script.h>
#include <test/util/setup_common.h>
#include <test/util/time.h>
#include <test/util/validation.h>
#include <txmempool.h>
#include <uint256.h>
#include <util/check.h>
#include <util/time.h>
#include <validation.h>
#include <validationinterface.h>

#include <boost/multi_index/detail/hash_index_iterator.hpp>

#include <cstddef>
#include <cstdint>
#include <functional>
#include <iterator>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>

namespace {

TestingSetup* g_setup;

//! Fee each created tx will pay.
const CAmount AMOUNT_FEE{1000};
//! Cached coinbases that each iteration can copy and use.
std::vector<std::pair<COutPoint, CAmount>> g_mature_coinbase;
//! Constant value used to create valid headers.
uint32_t g_nBits;
//! One for each block the fuzzer generates.
struct BlockInfo {
    std::shared_ptr<CBlock> block;
    uint256 hash;
    uint32_t height;
};
//! Used to access prefilledtxn and shorttxids.
class FuzzedCBlockHeaderAndShortTxIDs : public CBlockHeaderAndShortTxIDs
{
    using CBlockHeaderAndShortTxIDs::CBlockHeaderAndShortTxIDs;

public:
    void AddPrefilledTx(PrefilledTransaction&& prefilledtx)
    {
        prefilledtxn.push_back(std::move(prefilledtx));
    }

    void RemoveCoinbasePrefill()
    {
        prefilledtxn.erase(prefilledtxn.begin());
    }

    void InsertCoinbaseShortTxID(uint64_t shorttxid)
    {
        shorttxids.insert(shorttxids.begin(), shorttxid);
    }

    void EraseShortTxIDs(size_t index)
    {
        shorttxids.erase(shorttxids.begin() + index);
    }

    size_t PrefilledTxCount() {
        return prefilledtxn.size();
    }

    size_t ShortTxIDCount() {
        return shorttxids.size();
    }
};


} // namespace

extern void MakeRandDeterministicDANGEROUS(const uint256& seed) noexcept;

void initialize_cmpctblock()
{
    FakeNodeClock init_clock{}; // Uses the existing mock time
    static const auto testing_setup = MakeNoLogFileContext<TestingSetup>();
    g_setup = testing_setup.get();
    g_nBits = Params().GenesisBlock().nBits;
    // Replace validation_signals before creating chainman and mempool so they use it.
    testing_setup->m_node.validation_signals = std::make_unique<ValidationSignals>(std::make_unique<ImmediateBackgroundTaskRunner>());
    g_mature_coinbase = ResetChainmanAndMempool(*g_setup, init_clock);
}

FUZZ_TARGET(cmpctblock, .init = initialize_cmpctblock)
{
    SeedRandomStateForTest(SeedRand::ZEROS);
    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());

    FakeNodeClock node_clock{1610000000s}; // 2021-01-07, arbitrary
    FakeSteadyClock steady_clock;

    auto setup = g_setup;
    auto& mempool = *setup->m_node.mempool;
    auto& chainman = static_cast<TestChainstateManager&>(*setup->m_node.chainman);
    chainman.ResetIbd();
    chainman.DisableNextWrite();
    const size_t initial_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};

    AddrMan addrman{*setup->m_node.netgroupman, /*deterministic=*/true, /*consistency_check_ratio=*/0};
    auto& connman = *static_cast<ConnmanTestMsg*>(setup->m_node.connman.get());
    auto peerman = PeerManager::make(connman, addrman,
                                     /*banman=*/nullptr, chainman,
                                     mempool, *setup->m_node.warnings,
                                     PeerManager::Options{
                                         .deterministic_rng = true,
                                     });
    connman.SetMsgProc(peerman.get());

    setup->m_node.validation_signals->RegisterValidationInterface(peerman.get());
    setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();

    LOCK(NetEventsInterface::g_msgproc_mutex);

    std::vector<CNode*> peers;
    for (int i = 0; i < 4; ++i) {
        peers.push_back(ConsumeNodeAsUniquePtr(fuzzed_data_provider, steady_clock, i).release());
        CNode& p2p_node = *peers.back();
        FillNode(fuzzed_data_provider, connman, p2p_node);
        connman.AddTestNode(p2p_node);
    }

    // Stores blocks generated this iteration.
    std::vector<BlockInfo> info;

    // Coinbase UTXOs for this iteration.
    std::vector<std::pair<COutPoint, CAmount>> mature_coinbase = g_mature_coinbase;

    const uint64_t initial_sequence{WITH_LOCK(mempool.cs, return mempool.GetSequence())};

    auto create_tx = [&]() -> CTransactionRef {
        CMutableTransaction tx_mut;
        tx_mut.version = fuzzed_data_provider.ConsumeBool() ? CTransaction::CURRENT_VERSION : TRUC_VERSION;
        tx_mut.nLockTime = fuzzed_data_provider.ConsumeBool() ? 0 : fuzzed_data_provider.ConsumeIntegral<uint32_t>();

        // Choose an outpoint from the mempool, created blocks, or coinbases.
        CAmount amount_in;
        COutPoint outpoint;
        unsigned long mempool_size = mempool.size();
        if (mempool_size != 0 && fuzzed_data_provider.ConsumeBool()) {
            size_t random_idx = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mempool_size - 1);
            CTransactionRef tx = WITH_LOCK(mempool.cs, return mempool.txns_randomized[random_idx].second->GetSharedTx(););
            outpoint = COutPoint(tx->GetHash(), 0);
            amount_in = tx->vout[0].nValue;
        } else if (info.size() != 0 && fuzzed_data_provider.ConsumeBool()) {
            // These blocks (and txs) may be invalid, use a spent output, or not be in the main chain.
            auto info_it = info.begin();
            std::advance(info_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1));
            auto tx_it = info_it->block->vtx.begin();
            std::advance(tx_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info_it->block->vtx.size() - 1));
            outpoint = COutPoint(tx_it->get()->GetHash(), 0);
            amount_in = tx_it->get()->vout[0].nValue;
        } else {
            auto coinbase_it = mature_coinbase.begin();
            std::advance(coinbase_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mature_coinbase.size() - 1));
            outpoint = coinbase_it->first;
            amount_in = coinbase_it->second;
        }

        const auto sequence = ConsumeSequence(fuzzed_data_provider);
        const auto script_sig = CScript{};
        const auto script_wit_stack = std::vector<std::vector<uint8_t>>{WITNESS_STACK_ELEM_OP_TRUE};

        CTxIn in;
        in.prevout = outpoint;
        in.nSequence = sequence;
        in.scriptSig = script_sig;
        in.scriptWitness.stack = script_wit_stack;
        tx_mut.vin.push_back(in);

        const CAmount amount_out = amount_in - AMOUNT_FEE;
        tx_mut.vout.emplace_back(amount_out, P2WSH_OP_TRUE);

        auto tx = MakeTransactionRef(tx_mut);
        return tx;
    };

    auto create_block = [&]() {
        uint256 prev;
        uint32_t height;

        if (info.size() == 0 || fuzzed_data_provider.ConsumeBool()) {
            LOCK(cs_main);
            prev = chainman.ActiveChain().Tip()->GetBlockHash();
            height = chainman.ActiveChain().Height() + 1;
        } else {
            size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1);
            prev = info[index].hash;
            height = info[index].height + 1;
        }

        const auto new_time = WITH_LOCK(::cs_main, return chainman.ActiveChain().Tip()->GetMedianTimePast() + 1);

        CBlockHeader header;
        header.nNonce = 0;
        header.hashPrevBlock = prev;
        header.nBits = g_nBits;
        header.nTime = new_time;
        header.nVersion = fuzzed_data_provider.ConsumeIntegral<int32_t>();

        std::shared_ptr<CBlock> block = std::make_shared<CBlock>();
        *block = header;

        CMutableTransaction coinbase_tx;
        coinbase_tx.vin.resize(1);
        coinbase_tx.vin[0].prevout.SetNull();
        coinbase_tx.vin[0].scriptSig = CScript() << height << OP_0;
        coinbase_tx.vout.resize(1);
        coinbase_tx.vout[0].scriptPubKey = CScript() << OP_TRUE;
        coinbase_tx.vout[0].nValue = COIN;
        block->vtx.push_back(MakeTransactionRef(coinbase_tx));

        const auto mempool_size = mempool.size();
        if (fuzzed_data_provider.ConsumeBool() && mempool_size != 0) {
            // Add txns from the mempool. Since we do not include parents, it may be an invalid block.
            size_t num_txns = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, mempool_size);
            size_t random_idx = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mempool_size - 1);

            LOCK(mempool.cs);
            for (size_t i = random_idx; i < random_idx + num_txns; ++i) {
                CTransactionRef mempool_tx = mempool.txns_randomized[i % mempool_size].second->GetSharedTx();
                block->vtx.push_back(mempool_tx);
            }
        }

        // Create and add (possibly invalid) txns that are not in the mempool.
        if (fuzzed_data_provider.ConsumeBool()) {
            size_t new_txns = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 10);
            for (size_t i = 0; i < new_txns; ++i) {
                CTransactionRef non_mempool_tx = create_tx();
                block->vtx.push_back(non_mempool_tx);
            }
        }

        CBlockIndex* pindexPrev{WITH_LOCK(::cs_main, return chainman.m_blockman.LookupBlockIndex(prev))};
        chainman.GenerateCoinbaseCommitment(*block, pindexPrev);

        bool mutated;
        block->hashMerkleRoot = BlockMerkleRoot(*block, &mutated);
        FinalizeHeader(*block, chainman);

        BlockInfo block_info;
        block_info.block = block;
        block_info.hash = block->GetHash();
        block_info.height = height;

        return block_info;
    };

    LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 1000) {
        CSerializedNetMsg net_msg;
        bool sent_net_msg = true;
        bool requested_hb = false;
        bool sent_sendcmpct = false;
        bool valid_sendcmpct = false;

        CallOneOf(
            fuzzed_data_provider,
            [&]() {
                // Send a compact block.
                std::shared_ptr<CBlock> cblock;

                // Pick an existing block or create a new block.
                if (fuzzed_data_provider.ConsumeBool() && info.size() != 0) {
                    size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1);
                    cblock = info[index].block;
                } else {
                    BlockInfo block_info = create_block();
                    cblock = block_info.block;
                    info.push_back(block_info);
                }

                uint64_t nonce = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
                FuzzedCBlockHeaderAndShortTxIDs cmpctblock(*cblock, nonce);

                if (fuzzed_data_provider.ConsumeBool()) {
                    CBlockHeaderAndShortTxIDs base_cmpctblock = cmpctblock;
                    net_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, base_cmpctblock);
                    return;
                }

                int prev_idx = 0;
                size_t num_erased = 1;
                size_t num_txs = cblock->vtx.size();

                for (size_t i = 0; i < num_txs; ++i) {
                    if (i == 0) {
                        // Handle the coinbase specially. We either keep it prefilled or remove it.
                        if (fuzzed_data_provider.ConsumeBool()) continue;

                        // Remove the prefilled coinbase.
                        num_erased = 0;
                        uint64_t coinbase_shortid = cmpctblock.GetShortID(cblock->vtx[0]->GetWitnessHash());
                        cmpctblock.RemoveCoinbasePrefill();
                        cmpctblock.InsertCoinbaseShortTxID(coinbase_shortid);
                        continue;
                    }

                    if (fuzzed_data_provider.ConsumeBool()) continue;

                    uint16_t prefill_idx = num_erased == 0 ? i : i - prev_idx - 1;
                    prev_idx = i;
                    CTransactionRef txref = cblock->vtx[i];
                    PrefilledTransaction prefilledtx = {/*index=*/prefill_idx, txref};
                    cmpctblock.AddPrefilledTx(std::move(prefilledtx));

                    // Remove from shorttxids since we've prefilled. Subtract however many txs have been prefilled.
                    cmpctblock.EraseShortTxIDs(i - num_erased);
                    ++num_erased;
                }

                assert(cmpctblock.PrefilledTxCount() + cmpctblock.ShortTxIDCount() == num_txs);

                CBlockHeaderAndShortTxIDs base_cmpctblock = cmpctblock;
                net_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, base_cmpctblock);
            },
            [&]() {
                // Send a blocktxn message for an existing block (if one exists).
                size_t num_blocks = info.size();
                if (num_blocks == 0) {
                    sent_net_msg = false;
                    return;
                }

                // Fetch an existing block and randomly choose transactions to send over.
                size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, num_blocks - 1);
                const BlockInfo& block_info = info[index];
                BlockTransactions block_txn;
                block_txn.blockhash = block_info.hash;
                std::shared_ptr<CBlock> cblock = block_info.block;

                for (size_t i = 0; i < cblock->vtx.size(); i++) {
                    if (fuzzed_data_provider.ConsumeBool()) continue;

                    block_txn.txn.push_back(cblock->vtx[i]);
                }

                net_msg = NetMsg::Make(NetMsgType::BLOCKTXN, block_txn);
            },
            [&]() {
                // Send a headers message for an existing block (if one exists).
                size_t num_blocks = info.size();
                if (num_blocks == 0) {
                    sent_net_msg = false;
                    return;
                }

                // Choose an existing block and send a HEADERS message for it.
                size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, num_blocks - 1);
                CBlock block = *info[index].block;
                block.vtx.clear(); // No tx in HEADERS.
                std::vector<CBlock> headers;
                headers.emplace_back(block);

                net_msg = NetMsg::Make(NetMsgType::HEADERS, TX_WITH_WITNESS(headers));
            },
            [&]() {
                // Send a sendcmpct message, optionally setting hb mode.
                bool hb = fuzzed_data_provider.ConsumeBool();
                uint64_t version{fuzzed_data_provider.ConsumeBool() ? CMPCTBLOCKS_VERSION : fuzzed_data_provider.ConsumeIntegral<uint64_t>()};
                net_msg = NetMsg::Make(NetMsgType::SENDCMPCT, /*high_bandwidth=*/hb, /*version=*/version);
                requested_hb = hb;
                sent_sendcmpct = true;
                valid_sendcmpct = version == CMPCTBLOCKS_VERSION;
            },
            [&]() {
                // Mine a block, but don't send it.
                BlockInfo block_info = create_block();
                info.push_back(block_info);
                sent_net_msg = false;
            },
            [&]() {
                // Send a transaction.
                CTransactionRef tx = create_tx();
                net_msg = NetMsg::Make(NetMsgType::TX, TX_WITH_WITNESS(*tx));
            },
            [&]() {
                // Set mock time randomly or to tip's time.
                if (fuzzed_data_provider.ConsumeBool()) {
                    node_clock.set(ConsumeTime(fuzzed_data_provider));
                } else {
                    const NodeSeconds tip_time = WITH_LOCK(::cs_main, return chainman.ActiveChain().Tip()->Time());
                    node_clock.set(tip_time);
                }

                sent_net_msg = false;
            });

        if (!sent_net_msg) {
            continue;
        }

        CNode& random_node = *PickValue(fuzzed_data_provider, peers);
        connman.FlushSendBuffer(random_node);
        (void)connman.ReceiveMsgFrom(random_node, std::move(net_msg));

        bool more_work{true};
        while (more_work) {
            random_node.fPauseSend = false;

            more_work = connman.ProcessMessagesOnce(random_node);
            peerman->SendMessages(random_node);
        }

        std::vector<CNodeStats> stats;
        connman.GetNodeStats(stats);

        // We should have at maximum 3 HB peers.
        int num_hb = 0;
        for (const CNodeStats& stat : stats) {
            if (stat.m_bip152_highbandwidth_to) {
                // HB peers cannot be feelers or other "special" connections (besides addr-fetch).
                CNode* hb_peer = peers[stat.nodeid];
                if (!hb_peer->fDisconnect) num_hb += 1;
                assert(hb_peer->IsInboundConn() || hb_peer->IsOutboundOrBlockRelayConn() || hb_peer->IsManualConn() || hb_peer->IsAddrFetchConn());
            }
        }
        assert(num_hb <= 3);

        if (sent_sendcmpct && !random_node.fDisconnect) {
            // If the fuzzer sent SENDCMPCT with proper version, check the node's state matches what it sent.
            const CNodeStats& random_node_stats = stats[random_node.GetId()];
            if (valid_sendcmpct) assert(random_node_stats.m_bip152_highbandwidth_from == requested_hb);
        }
    }

    setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
    setup->m_node.validation_signals->UnregisterAllValidationInterfaces();
    connman.StopNodes();

    const size_t end_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
    const uint64_t end_sequence{WITH_LOCK(mempool.cs, return mempool.GetSequence())};

    if (initial_index_size != end_index_size || initial_sequence != end_sequence) {
        MakeRandDeterministicDANGEROUS(uint256::ZERO);
        g_mature_coinbase = ResetChainmanAndMempool(*g_setup, node_clock);
    }
}

Coverage Report

Created: 2026-09-01 13:33

Line	Count	Source
1		// Copyright (c) 2026 The Bitcoin Core developers
2		// Distributed under the MIT software license, see the accompanying
3		// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5		#include <addrman.h>
6		#include <blockencodings.h>
7		#include <chain.h>
8		#include <chainparams.h>
9		#include <coins.h>
10		#include <consensus/amount.h>
11		#include <consensus/consensus.h>
12		#include <consensus/merkle.h>
13		#include <net.h>
14		#include <net_processing.h>
15		#include <netmessagemaker.h>
16		#include <node/blockstorage.h>
17		#include <policy/truc_policy.h>
18		#include <primitives/block.h>
19		#include <primitives/transaction.h>
20		#include <protocol.h>
21		#include <script/script.h>
22		#include <serialize.h>
23		#include <sync.h>
24		#include <test/fuzz/FuzzedDataProvider.h>
25		#include <test/fuzz/fuzz.h>
26		#include <test/fuzz/util.h>
27		#include <test/fuzz/util/net.h>
28		#include <test/util/net.h>
29		#include <test/util/random.h>
30		#include <test/util/script.h>
31		#include <test/util/setup_common.h>
32		#include <test/util/time.h>
33		#include <test/util/validation.h>
34		#include <txmempool.h>
35		#include <uint256.h>
36		#include <util/check.h>
37		#include <util/time.h>
38		#include <validation.h>
39		#include <validationinterface.h>
40
41		#include <boost/multi_index/detail/hash_index_iterator.hpp>
42
43		#include <cstddef>
44		#include <cstdint>
45		#include <functional>
46		#include <iterator>
47		#include <memory>
48		#include <optional>
49		#include <string>
50		#include <utility>
51		#include <vector>
52
53		namespace {
54
55		TestingSetup* g_setup;
56
57		//! Fee each created tx will pay.
58		const CAmount AMOUNT_FEE{1000};
59		//! Cached coinbases that each iteration can copy and use.
60		std::vector<std::pair<COutPoint, CAmount>> g_mature_coinbase;
61		//! Constant value used to create valid headers.
62		uint32_t g_nBits;
63		//! One for each block the fuzzer generates.
64		struct BlockInfo {
65		std::shared_ptr<CBlock> block;
66		uint256 hash;
67		uint32_t height;
68		};
69		//! Used to access prefilledtxn and shorttxids.
70		class FuzzedCBlockHeaderAndShortTxIDs : public CBlockHeaderAndShortTxIDs
71		{
72		using CBlockHeaderAndShortTxIDs::CBlockHeaderAndShortTxIDs;
73
74		public:
75		void AddPrefilledTx(PrefilledTransaction&& prefilledtx)
76	2.93k	{
77	2.93k	prefilledtxn.push_back(std::move(prefilledtx));
78	2.93k	}
79
80		void RemoveCoinbasePrefill()
81	870	{
82	870	prefilledtxn.erase(prefilledtxn.begin());
83	870	}
84
85		void InsertCoinbaseShortTxID(uint64_t shorttxid)
86	870	{
87	870	shorttxids.insert(shorttxids.begin(), shorttxid);
88	870	}
89
90		void EraseShortTxIDs(size_t index)
91	2.93k	{
92	2.93k	shorttxids.erase(shorttxids.begin() + index);
93	2.93k	}
94
95	1.62k	size_t PrefilledTxCount() {
96	1.62k	return prefilledtxn.size();
97	1.62k	}
98
99	1.62k	size_t ShortTxIDCount() {
100	1.62k	return shorttxids.size();
101	1.62k	}
102		};
103
104
105		} // namespace
106
107		extern void MakeRandDeterministicDANGEROUS(const uint256& seed) noexcept;
108
109		void initialize_cmpctblock()
110	0	{
111	0	FakeNodeClock init_clock{}; // Uses the existing mock time
112	0	static const auto testing_setup = MakeNoLogFileContext<TestingSetup>();
113	0	g_setup = testing_setup.get();
114	0	g_nBits = Params().GenesisBlock().nBits;
115		// Replace validation_signals before creating chainman and mempool so they use it.
116	0	testing_setup->m_node.validation_signals = std::make_unique<ValidationSignals>(std::make_unique<ImmediateBackgroundTaskRunner>());
117	0	g_mature_coinbase = ResetChainmanAndMempool(*g_setup, init_clock);
118	0	}
119
120		FUZZ_TARGET(cmpctblock, .init = initialize_cmpctblock)
121	1.66k	{
122	1.66k	SeedRandomStateForTest(SeedRand::ZEROS);
123	1.66k	FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
124
125	1.66k	FakeNodeClock node_clock{1610000000s}; // 2021-01-07, arbitrary
126	1.66k	FakeSteadyClock steady_clock;
127
128	1.66k	auto setup = g_setup;
129	1.66k	auto& mempool = *setup->m_node.mempool;
130	1.66k	auto& chainman = static_cast<TestChainstateManager&>(*setup->m_node.chainman);
131	1.66k	chainman.ResetIbd();
132	1.66k	chainman.DisableNextWrite();
133	1.66k	const size_t initial_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
134
135	1.66k	AddrMan addrman{setup->m_node.netgroupman, /deterministic=/true, /consistency_check_ratio=*/0};
136	1.66k	auto& connman = static_cast<ConnmanTestMsg>(setup->m_node.connman.get());
137	1.66k	auto peerman = PeerManager::make(connman, addrman,
138	1.66k	/banman=/nullptr, chainman,
139	1.66k	mempool, *setup->m_node.warnings,
140	1.66k	PeerManager::Options{
141	1.66k	.deterministic_rng = true,
142	1.66k	});
143	1.66k	connman.SetMsgProc(peerman.get());
144
145	1.66k	setup->m_node.validation_signals->RegisterValidationInterface(peerman.get());
146	1.66k	setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
147
148	1.66k	LOCK(NetEventsInterface::g_msgproc_mutex);
149
150	1.66k	std::vector<CNode*> peers;
151	8.31k	for (int i = 0; i < 4; ++i) { Branch (151:21): [True: 6.64k, False: 1.66k]
152	6.64k	peers.push_back(ConsumeNodeAsUniquePtr(fuzzed_data_provider, steady_clock, i).release());
153	6.64k	CNode& p2p_node = *peers.back();
154	6.64k	FillNode(fuzzed_data_provider, connman, p2p_node);
155	6.64k	connman.AddTestNode(p2p_node);
156	6.64k	}
157
158		// Stores blocks generated this iteration.
159	1.66k	std::vector<BlockInfo> info;
160
161		// Coinbase UTXOs for this iteration.
162	1.66k	std::vector<std::pair<COutPoint, CAmount>> mature_coinbase = g_mature_coinbase;
163
164	1.66k	const uint64_t initial_sequence{WITH_LOCK(mempool.cs, return mempool.GetSequence())};
165
166	312k	auto create_tx = [&]() -> CTransactionRef {
167	312k	CMutableTransaction tx_mut;
168	312k	tx_mut.version = fuzzed_data_provider.ConsumeBool() ? CTransaction::CURRENT_VERSION : TRUC_VERSION; Branch (168:26): [True: 306k, False: 5.71k]
169	312k	tx_mut.nLockTime = fuzzed_data_provider.ConsumeBool() ? 0 : fuzzed_data_provider.ConsumeIntegral<uint32_t>(); Branch (169:28): [True: 306k, False: 5.91k]
170
171		// Choose an outpoint from the mempool, created blocks, or coinbases.
172	312k	CAmount amount_in;
173	312k	COutPoint outpoint;
174	312k	unsigned long mempool_size = mempool.size();
175	312k	if (mempool_size != 0 && fuzzed_data_provider.ConsumeBool()) { Branch (175:13): [True: 192k, False: 119k] Branch (175:34): [True: 187k, False: 4.69k]
176	187k	size_t random_idx = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mempool_size - 1);
177	187k	CTransactionRef tx = WITH_LOCK(mempool.cs, return mempool.txns_randomized[random_idx].second->GetSharedTx(););
178	187k	outpoint = COutPoint(tx->GetHash(), 0);
179	187k	amount_in = tx->vout[0].nValue;
180	187k	} else if (info.size() != 0 && fuzzed_data_provider.ConsumeBool()) { Branch (180:20): [True: 121k, False: 3.40k] Branch (180:40): [True: 113k, False: 7.70k]
181		// These blocks (and txs) may be invalid, use a spent output, or not be in the main chain.
182	113k	auto info_it = info.begin();
183	113k	std::advance(info_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1));
184	113k	auto tx_it = info_it->block->vtx.begin();
185	113k	std::advance(tx_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info_it->block->vtx.size() - 1));
186	113k	outpoint = COutPoint(tx_it->get()->GetHash(), 0);
187	113k	amount_in = tx_it->get()->vout[0].nValue;
188	113k	} else {
189	11.1k	auto coinbase_it = mature_coinbase.begin();
190	11.1k	std::advance(coinbase_it, fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mature_coinbase.size() - 1));
191	11.1k	outpoint = coinbase_it->first;
192	11.1k	amount_in = coinbase_it->second;
193	11.1k	}
194
195	312k	const auto sequence = ConsumeSequence(fuzzed_data_provider);
196	312k	const auto script_sig = CScript{};
197	312k	const auto script_wit_stack = std::vector<std::vector<uint8_t>>{WITNESS_STACK_ELEM_OP_TRUE};
198
199	312k	CTxIn in;
200	312k	in.prevout = outpoint;
201	312k	in.nSequence = sequence;
202	312k	in.scriptSig = script_sig;
203	312k	in.scriptWitness.stack = script_wit_stack;
204	312k	tx_mut.vin.push_back(in);
205
206	312k	const CAmount amount_out = amount_in - AMOUNT_FEE;
207	312k	tx_mut.vout.emplace_back(amount_out, P2WSH_OP_TRUE);
208
209	312k	auto tx = MakeTransactionRef(tx_mut);
210	312k	return tx;
211	312k	};
212
213	33.3k	auto create_block = [&]() {
214	33.3k	uint256 prev;
215	33.3k	uint32_t height;
216
217	33.3k	if (info.size() == 0 \|\| fuzzed_data_provider.ConsumeBool()) { Branch (217:13): [True: 1.22k, False: 32.1k] Branch (217:33): [True: 30.5k, False: 1.57k]
218	31.7k	LOCK(cs_main);
219	31.7k	prev = chainman.ActiveChain().Tip()->GetBlockHash();
220	31.7k	height = chainman.ActiveChain().Height() + 1;
221	31.7k	} else {
222	1.57k	size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1);
223	1.57k	prev = info[index].hash;
224	1.57k	height = info[index].height + 1;
225	1.57k	}
226
227	33.3k	const auto new_time = WITH_LOCK(::cs_main, return chainman.ActiveChain().Tip()->GetMedianTimePast() + 1);
228
229	33.3k	CBlockHeader header;
230	33.3k	header.nNonce = 0;
231	33.3k	header.hashPrevBlock = prev;
232	33.3k	header.nBits = g_nBits;
233	33.3k	header.nTime = new_time;
234	33.3k	header.nVersion = fuzzed_data_provider.ConsumeIntegral<int32_t>();
235
236	33.3k	std::shared_ptr<CBlock> block = std::make_shared<CBlock>();
237	33.3k	*block = header;
238
239	33.3k	CMutableTransaction coinbase_tx;
240	33.3k	coinbase_tx.vin.resize(1);
241	33.3k	coinbase_tx.vin[0].prevout.SetNull();
242	33.3k	coinbase_tx.vin[0].scriptSig = CScript() << height << OP_0;
243	33.3k	coinbase_tx.vout.resize(1);
244	33.3k	coinbase_tx.vout[0].scriptPubKey = CScript() << OP_TRUE;
245	33.3k	coinbase_tx.vout[0].nValue = COIN;
246	33.3k	block->vtx.push_back(MakeTransactionRef(coinbase_tx));
247
248	33.3k	const auto mempool_size = mempool.size();
249	33.3k	if (fuzzed_data_provider.ConsumeBool() && mempool_size != 0) { Branch (249:13): [True: 31.2k, False: 2.06k] Branch (249:51): [True: 13.7k, False: 17.5k]
250		// Add txns from the mempool. Since we do not include parents, it may be an invalid block.
251	13.7k	size_t num_txns = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, mempool_size);
252	13.7k	size_t random_idx = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, mempool_size - 1);
253
254	13.7k	LOCK(mempool.cs);
255	104k	for (size_t i = random_idx; i < random_idx + num_txns; ++i) { Branch (255:41): [True: 90.9k, False: 13.7k]
256	90.9k	CTransactionRef mempool_tx = mempool.txns_randomized[i % mempool_size].second->GetSharedTx();
257	90.9k	block->vtx.push_back(mempool_tx);
258	90.9k	}
259	13.7k	}
260
261		// Create and add (possibly invalid) txns that are not in the mempool.
262	33.3k	if (fuzzed_data_provider.ConsumeBool()) { Branch (262:13): [True: 30.8k, False: 2.51k]
263	30.8k	size_t new_txns = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 10);
264	196k	for (size_t i = 0; i < new_txns; ++i) { Branch (264:32): [True: 166k, False: 30.8k]
265	166k	CTransactionRef non_mempool_tx = create_tx();
266	166k	block->vtx.push_back(non_mempool_tx);
267	166k	}
268	30.8k	}
269
270	33.3k	CBlockIndex* pindexPrev{WITH_LOCK(::cs_main, return chainman.m_blockman.LookupBlockIndex(prev))};
271	33.3k	chainman.GenerateCoinbaseCommitment(*block, pindexPrev);
272
273	33.3k	bool mutated;
274	33.3k	block->hashMerkleRoot = BlockMerkleRoot(*block, &mutated);
275	33.3k	FinalizeHeader(*block, chainman);
276
277	33.3k	BlockInfo block_info;
278	33.3k	block_info.block = block;
279	33.3k	block_info.hash = block->GetHash();
280	33.3k	block_info.height = height;
281
282	33.3k	return block_info;
283	33.3k	};
284
285	383k	LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 1000) {
286	383k	CSerializedNetMsg net_msg;
287	383k	bool sent_net_msg = true;
288	383k	bool requested_hb = false;
289	383k	bool sent_sendcmpct = false;
290	383k	bool valid_sendcmpct = false;
291
292	383k	CallOneOf(
293	383k	fuzzed_data_provider,
294	383k	[&]() {
295		// Send a compact block.
296	69.5k	std::shared_ptr<CBlock> cblock;
297
298		// Pick an existing block or create a new block.
299	69.5k	if (fuzzed_data_provider.ConsumeBool() && info.size() != 0) { Branch (299:21): [True: 66.9k, False: 2.59k] Branch (299:59): [True: 66.4k, False: 536]
300	66.4k	size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, info.size() - 1);
301	66.4k	cblock = info[index].block;
302	66.4k	} else {
303	3.13k	BlockInfo block_info = create_block();
304	3.13k	cblock = block_info.block;
305	3.13k	info.push_back(block_info);
306	3.13k	}
307
308	69.5k	uint64_t nonce = fuzzed_data_provider.ConsumeIntegral<uint64_t>();
309	69.5k	FuzzedCBlockHeaderAndShortTxIDs cmpctblock(*cblock, nonce);
310
311	69.5k	if (fuzzed_data_provider.ConsumeBool()) { Branch (311:21): [True: 67.9k, False: 1.62k]
312	67.9k	CBlockHeaderAndShortTxIDs base_cmpctblock = cmpctblock;
313	67.9k	net_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, base_cmpctblock);
314	67.9k	return;
315	67.9k	}
316
317	1.62k	int prev_idx = 0;
318	1.62k	size_t num_erased = 1;
319	1.62k	size_t num_txs = cblock->vtx.size();
320
321	9.76k	for (size_t i = 0; i < num_txs; ++i) { Branch (321:36): [True: 8.13k, False: 1.62k]
322	8.13k	if (i == 0) { Branch (322:25): [True: 1.62k, False: 6.51k]
323		// Handle the coinbase specially. We either keep it prefilled or remove it.
324	1.62k	if (fuzzed_data_provider.ConsumeBool()) continue; Branch (324:29): [True: 752, False: 870]
325
326		// Remove the prefilled coinbase.
327	870	num_erased = 0;
328	870	uint64_t coinbase_shortid = cmpctblock.GetShortID(cblock->vtx[0]->GetWitnessHash());
329	870	cmpctblock.RemoveCoinbasePrefill();
330	870	cmpctblock.InsertCoinbaseShortTxID(coinbase_shortid);
331	870	continue;
332	1.62k	}
333
334	6.51k	if (fuzzed_data_provider.ConsumeBool()) continue; Branch (334:25): [True: 3.57k, False: 2.93k]
335
336	2.93k	uint16_t prefill_idx = num_erased == 0 ? i : i - prev_idx - 1; Branch (336:44): [True: 448, False: 2.48k]
337	2.93k	prev_idx = i;
338	2.93k	CTransactionRef txref = cblock->vtx[i];
339	2.93k	PrefilledTransaction prefilledtx = {/index=/prefill_idx, txref};
340	2.93k	cmpctblock.AddPrefilledTx(std::move(prefilledtx));
341
342		// Remove from shorttxids since we've prefilled. Subtract however many txs have been prefilled.
343	2.93k	cmpctblock.EraseShortTxIDs(i - num_erased);
344	2.93k	++num_erased;
345	2.93k	}
346
347	1.62k	assert(cmpctblock.PrefilledTxCount() + cmpctblock.ShortTxIDCount() == num_txs); Branch (347:17): [True: 1.62k, False: 0]
348
349	1.62k	CBlockHeaderAndShortTxIDs base_cmpctblock = cmpctblock;
350	1.62k	net_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, base_cmpctblock);
351	1.62k	},
352	383k	[&]() {
353		// Send a blocktxn message for an existing block (if one exists).
354	6.35k	size_t num_blocks = info.size();
355	6.35k	if (num_blocks == 0) { Branch (355:21): [True: 648, False: 5.70k]
356	648	sent_net_msg = false;
357	648	return;
358	648	}
359
360		// Fetch an existing block and randomly choose transactions to send over.
361	5.70k	size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, num_blocks - 1);
362	5.70k	const BlockInfo& block_info = info[index];
363	5.70k	BlockTransactions block_txn;
364	5.70k	block_txn.blockhash = block_info.hash;
365	5.70k	std::shared_ptr<CBlock> cblock = block_info.block;
366
367	31.6k	for (size_t i = 0; i < cblock->vtx.size(); i++) { Branch (367:36): [True: 25.9k, False: 5.70k]
368	25.9k	if (fuzzed_data_provider.ConsumeBool()) continue; Branch (368:25): [True: 23.7k, False: 2.23k]
369
370	2.23k	block_txn.txn.push_back(cblock->vtx[i]);
371	2.23k	}
372
373	5.70k	net_msg = NetMsg::Make(NetMsgType::BLOCKTXN, block_txn);
374	5.70k	},
375	383k	[&]() {
376		// Send a headers message for an existing block (if one exists).
377	88.7k	size_t num_blocks = info.size();
378	88.7k	if (num_blocks == 0) { Branch (378:21): [True: 9.62k, False: 79.0k]
379	9.62k	sent_net_msg = false;
380	9.62k	return;
381	9.62k	}
382
383		// Choose an existing block and send a HEADERS message for it.
384	79.0k	size_t index = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, num_blocks - 1);
385	79.0k	CBlock block = *info[index].block;
386	79.0k	block.vtx.clear(); // No tx in HEADERS.
387	79.0k	std::vector<CBlock> headers;
388	79.0k	headers.emplace_back(block);
389
390	79.0k	net_msg = NetMsg::Make(NetMsgType::HEADERS, TX_WITH_WITNESS(headers));
391	79.0k	},
392	383k	[&]() {
393		// Send a sendcmpct message, optionally setting hb mode.
394	23.0k	bool hb = fuzzed_data_provider.ConsumeBool();
395	23.0k	uint64_t version{fuzzed_data_provider.ConsumeBool() ? CMPCTBLOCKS_VERSION : fuzzed_data_provider.ConsumeIntegral<uint64_t>()}; Branch (395:34): [True: 22.3k, False: 707]
396	23.0k	net_msg = NetMsg::Make(NetMsgType::SENDCMPCT, /high_bandwidth=/hb, /version=/version);
397	23.0k	requested_hb = hb;
398	23.0k	sent_sendcmpct = true;
399	23.0k	valid_sendcmpct = version == CMPCTBLOCKS_VERSION;
400	23.0k	},
401	383k	[&]() {
402		// Mine a block, but don't send it.
403	30.1k	BlockInfo block_info = create_block();
404	30.1k	info.push_back(block_info);
405	30.1k	sent_net_msg = false;
406	30.1k	},
407	383k	[&]() {
408		// Send a transaction.
409	146k	CTransactionRef tx = create_tx();
410	146k	net_msg = NetMsg::Make(NetMsgType::TX, TX_WITH_WITNESS(*tx));
411	146k	},
412	383k	[&]() {
413		// Set mock time randomly or to tip's time.
414	19.7k	if (fuzzed_data_provider.ConsumeBool()) { Branch (414:21): [True: 17.4k, False: 2.24k]
415	17.4k	node_clock.set(ConsumeTime(fuzzed_data_provider));
416	17.4k	} else {
417	2.24k	const NodeSeconds tip_time = WITH_LOCK(::cs_main, return chainman.ActiveChain().Tip()->Time());
418	2.24k	node_clock.set(tip_time);
419	2.24k	}
420
421	19.7k	sent_net_msg = false;
422	19.7k	});
423
424	383k	if (!sent_net_msg) { Branch (424:13): [True: 60.1k, False: 323k]
425	60.1k	continue;
426	60.1k	}
427
428	323k	CNode& random_node = *PickValue(fuzzed_data_provider, peers);
429	323k	connman.FlushSendBuffer(random_node);
430	323k	(void)connman.ReceiveMsgFrom(random_node, std::move(net_msg));
431
432	323k	bool more_work{true};
433	647k	while (more_work) { Branch (433:16): [True: 324k, False: 323k]
434	324k	random_node.fPauseSend = false;
435
436	324k	more_work = connman.ProcessMessagesOnce(random_node);
437	324k	peerman->SendMessages(random_node);
438	324k	}
439
440	323k	std::vector<CNodeStats> stats;
441	323k	connman.GetNodeStats(stats);
442
443		// We should have at maximum 3 HB peers.
444	323k	int num_hb = 0;
445	1.29M	for (const CNodeStats& stat : stats) { Branch (445:37): [True: 1.29M, False: 323k]
446	1.29M	if (stat.m_bip152_highbandwidth_to) { Branch (446:17): [True: 3.26k, False: 1.29M]
447		// HB peers cannot be feelers or other "special" connections (besides addr-fetch).
448	3.26k	CNode* hb_peer = peers[stat.nodeid];
449	3.26k	if (!hb_peer->fDisconnect) num_hb += 1; Branch (449:21): [True: 3.16k, False: 105]
450	3.26k	assert(hb_peer->IsInboundConn() \|\| hb_peer->IsOutboundOrBlockRelayConn() \|\| hb_peer->IsManualConn() \|\| hb_peer->IsAddrFetchConn()); Branch (450:17): [True: 689, False: 2.57k] Branch (450:17): [True: 1.14k, False: 1.43k] Branch (450:17): [True: 1.34k, False: 85] Branch (450:17): [True: 85, False: 0] Branch (450:17): [True: 3.26k, False: 0]
451	3.26k	}
452	1.29M	}
453	323k	assert(num_hb <= 3); Branch (453:9): [True: 323k, False: 0]
454
455	323k	if (sent_sendcmpct && !random_node.fDisconnect) { Branch (455:13): [True: 23.0k, False: 300k] Branch (455:31): [True: 21.0k, False: 2.05k]
456		// If the fuzzer sent SENDCMPCT with proper version, check the node's state matches what it sent.
457	21.0k	const CNodeStats& random_node_stats = stats[random_node.GetId()];
458	21.0k	if (valid_sendcmpct) assert(random_node_stats.m_bip152_highbandwidth_from == requested_hb); Branch (458:17): [True: 20.4k, False: 628] Branch (458:34): [True: 20.4k, False: 0]
459	21.0k	}
460	323k	}
461
462	1.66k	setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();
463	1.66k	setup->m_node.validation_signals->UnregisterAllValidationInterfaces();
464	1.66k	connman.StopNodes();
465
466	1.66k	const size_t end_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
467	1.66k	const uint64_t end_sequence{WITH_LOCK(mempool.cs, return mempool.GetSequence())};
468
469	1.66k	if (initial_index_size != end_index_size \|\| initial_sequence != end_sequence) { Branch (469:9): [True: 944, False: 718] Branch (469:49): [True: 0, False: 718]
470	944	MakeRandDeterministicDANGEROUS(uint256::ZERO);
471	944	g_mature_coinbase = ResetChainmanAndMempool(*g_setup, node_clock);
472	944	}
473	1.66k	}