READ THE CODE

Inside Bitcoin

The code behind the network, with room to understand it.

Stable release v32.1bitcoin/bitcoin · f0de87f04062 ↗3,020 source files · 47.5 MB stored on the server440 file guides

Release published 2026-10-28 · Snapshot fetched 2026-11-01. Latest stable release at fetch time; development branches and Git history are excluded. Only the selected code window and visible folders load here.

5,743 bytes · SHA-256 44834fa390da1166… · View upstream ↗

1// Copyright (c) 2020-present 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 <banman.h>
7#include <kernel/chainparams.h>
8#include <net.h>
9#include <net_processing.h>
10#include <primitives/block.h>
11#include <primitives/transaction.h>
12#include <protocol.h>
13#include <sync.h>
14#include <test/fuzz/FuzzedDataProvider.h>
15#include <test/fuzz/fuzz.h>
16#include <test/fuzz/util.h>
17#include <test/fuzz/util/net.h>
18#include <test/util/net.h>
19#include <test/util/random.h>
20#include <test/util/setup_common.h>
21#include <test/util/time.h>
22#include <test/util/validation.h>
23#include <uint256.h>
24#include <util/check.h>
25#include <util/time.h>
26#include <validation.h>
27#include <validationinterface.h>
28
29#include <functional>
30#include <ios>
31#include <memory>
32#include <optional>
33#include <string>
34#include <utility>
35#include <vector>
36
37namespace {
38TestingSetup* g_setup;
39
40} // namespace
41
42extern void MakeRandDeterministicDANGEROUS(const uint256& seed) noexcept;
43
44void initialize_process_messages()
45{
46    FakeNodeClock init_clock{}; // Uses the existing mock time
47    static const auto testing_setup{
48        MakeNoLogFileContext<TestingSetup>(
49            /*chain_type=*/ChainType::REGTEST,
50            {}),
51    };
52    g_setup = testing_setup.get();
53    // Replace validation_signals before creating chainman and mempool so they use it.
54    g_setup->m_node.validation_signals = std::make_unique<ValidationSignals>(std::make_unique<ImmediateBackgroundTaskRunner>());
55    ResetChainmanAndMempool(*g_setup, init_clock);
56}
57
58FUZZ_TARGET(process_messages, .init = initialize_process_messages)
59{
60    SeedRandomStateForTest(SeedRand::ZEROS);
61    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
62
63    auto& node{g_setup->m_node};
64    auto& connman{static_cast<ConnmanTestMsg&>(*node.connman)};
65    connman.Reset();
66    auto& chainman{static_cast<TestChainstateManager&>(*node.chainman)};
67    const auto block_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
68    const auto initial_sequence{WITH_LOCK(node.mempool->cs, return node.mempool->GetSequence())};
69    FakeNodeClock node_clock{1610000000s}; // 2021-01-07, arbitrary
70    FakeSteadyClock steady_clock;
71    chainman.ResetIbd();
72    chainman.DisableNextWrite();
73
74    // Reset, so that dangling pointers can be detected by sanitizers.
75    node.banman.reset();
76    node.addrman.reset();
77    node.peerman.reset();
78    node.addrman = std::make_unique<AddrMan>(*node.netgroupman, /*deterministic=*/true, /*consistency_check_ratio=*/0);
79    node.peerman = PeerManager::make(connman, *node.addrman,
80                                     /*banman=*/nullptr, chainman,
81                                     *node.mempool, *node.warnings,
82                                     PeerManager::Options{
83                                         .reconcile_txs = true,
84                                         .deterministic_rng = true,
85                                     });
86    connman.SetMsgProc(node.peerman.get());
87    connman.SetAddrman(*node.addrman);
88
89    node.validation_signals->RegisterValidationInterface(node.peerman.get());
90
91    LOCK(NetEventsInterface::g_msgproc_mutex);
92
93    std::vector<CNode*> peers;
94    const auto num_peers_to_add = fuzzed_data_provider.ConsumeIntegralInRange(1, 3);
95    for (int i = 0; i < num_peers_to_add; ++i) {
96        peers.push_back(ConsumeNodeAsUniquePtr(fuzzed_data_provider, steady_clock, i).release());
97        CNode& p2p_node = *peers.back();
98
99        FillNode(fuzzed_data_provider, connman, p2p_node);
100
101        connman.AddTestNode(p2p_node);
102    }
103
104    // Toggle IBD from within the loop, so that some messages may be processed
105    // under IBD and the rest after leaving it. JumpOutOfIbd() latches, so guard
106    // it to call at most once.
107    bool jump_out_of_ibd{false};
108    LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 30) {
109        if (!jump_out_of_ibd) jump_out_of_ibd = fuzzed_data_provider.ConsumeBool();
110        if (jump_out_of_ibd && chainman.IsInitialBlockDownload()) chainman.JumpOutOfIbd();
111        const std::string random_message_type{fuzzed_data_provider.ConsumeBytesAsString(CMessageHeader::MESSAGE_TYPE_SIZE).c_str()};
112
113        node_clock.set(ConsumeTime(fuzzed_data_provider));
114
115        CSerializedNetMsg net_msg;
116        net_msg.m_type = random_message_type;
117        net_msg.data = ConsumeRandomLengthByteVector(fuzzed_data_provider, MAX_PROTOCOL_MESSAGE_LENGTH);
118
119        CNode& random_node = *PickValue(fuzzed_data_provider, peers);
120
121        connman.FlushSendBuffer(random_node);
122        (void)connman.ReceiveMsgFrom(random_node, std::move(net_msg));
123
124        bool more_work{true};
125        while (more_work) { // Ensure that every message is eventually processed in some way or another
126            random_node.fPauseSend = false;
127
128            try {
129                more_work = connman.ProcessMessagesOnce(random_node);
130            } catch (const std::ios_base::failure&) {
131            }
132            node.peerman->SendMessages(random_node);
133        }
134    }
135    node.validation_signals->SyncWithValidationInterfaceQueue();
136    node.validation_signals->UnregisterValidationInterface(node.peerman.get());
137    node.connman->StopNodes();
138    const auto end_sequence{WITH_LOCK(node.mempool->cs, return node.mempool->GetSequence())};
139    if (block_index_size != WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size()) || initial_sequence != end_sequence) {
140        // Reuse the global chainman and mempool, but reset them when dirty.
141        MakeRandDeterministicDANGEROUS(uint256::ZERO);
142        ResetChainmanAndMempool(*g_setup, node_clock);
143    }
144}
145

src/wallet/receive.cpp

src/wallet/coinselection.cpp

src/consensus/validation.h

src/primitives/transaction.cpp

src/script/descriptor.cpp

src/bitcoin-cli.cpp

src/rpc/blockchain.cpp

src/rpc/rawtransaction.cpp

src/init.cpp

src/crypto/sha256.cpp

src/consensus/merkle.h

src/consensus/tx_check.h

src/consensus/tx_verify.h

src/policy/feerate.h

src/policy/feerate.cpp

src/primitives/transaction_identifier.h

src/chainparamsbase.h

src/chainparamsbase.cpp

src/util/moneystr.cpp

src/crypto/ripemd160.h

src/crypto/sha1.h

src/crypto/sha512.h

src/crypto/hmac_sha256.h

src/crypto/hmac_sha512.h

src/crypto/hmac_sha256.cpp

src/crypto/hmac_sha512.cpp

src/crypto/hkdf_sha256_32.h

src/crypto/hkdf_sha256_32.cpp

src/support/cleanse.h

src/support/cleanse.cpp

src/crypto/siphash.cpp

src/crypto/muhash.h

src/crypto/chacha20.h

src/crypto/poly1305.h

src/crypto/chacha20poly1305.h

src/crypto/chacha20poly1305.cpp

src/util/chaintype.cpp

src/util/obfuscation.h

src/util/byte_units.h

src/util/overflow.h

src/blockencodings.cpp

src/net_permissions.cpp

src/policy/packages.cpp

src/policy/rbf.cpp

src/policy/truc_policy.cpp

src/policy/ephemeral_policy.cpp

src/policy/settings.cpp

src/policy/policy.cpp

src/node/transaction.cpp

src/node/coin.cpp

src/rpc/client.cpp

src/rpc/external_signer.cpp

src/rpc/request.cpp

src/rpc/server_util.cpp

src/rpc/fees.cpp

src/rpc/output_script.cpp

src/rpc/rawtransaction_util.cpp

src/rpc/rawtransaction_util.h

src/rpc/register.h

src/rpc/request.h

src/rpc/server_util.h

src/rpc/protocol.h

src/rpc/server.h

src/rpc/signmessage.cpp

src/rpc/txoutproof.cpp

src/rpc/util.cpp

src/rpc/util.h

src/wallet/rpc/addresses.cpp

src/wallet/rpc/backup.cpp

src/wallet/rpc/coins.cpp

src/wallet/rpc/encrypt.cpp

src/wallet/rpc/signmessage.cpp

src/wallet/rpc/util.cpp

src/wallet/rpc/util.h

src/wallet/coincontrol.cpp

src/wallet/coincontrol.h

src/wallet/context.cpp

src/wallet/context.h

src/wallet/crypter.cpp

src/wallet/crypter.h

src/wallet/db.cpp

src/wallet/export.cpp

src/wallet/external_signer_scriptpubkeyman.cpp

src/wallet/rpc/spend.cpp

src/wallet/rpc/transactions.cpp

src/wallet/rpc/wallet.cpp

src/wallet/feebumper.cpp

src/wallet/feebumper.h

src/index/base.h

src/index/base.cpp

src/index/txindex.h

src/index/txindex.cpp

src/index/txindex_key.h

src/index/txospenderindex.h

src/index/txospenderindex.cpp

src/index/blockfilterindex.h

src/index/blockfilterindex.cpp

src/index/coinstatsindex.h

src/index/coinstatsindex.cpp

src/index/db_key.h

src/index/disktxpos.h

src/kernel/chain.cpp

src/kernel/chain.h

src/kernel/checks.cpp

src/kernel/checks.h

src/kernel/context.cpp

src/kernel/context.h

src/kernel/cs_main.cpp

src/kernel/cs_main.h

src/kernel/disconnected_transactions.cpp

src/kernel/disconnected_transactions.h

src/kernel/mempool_removal_reason.cpp

src/kernel/mempool_removal_reason.h

src/kernel/coinstats.cpp

src/kernel/coinstats.h

src/kernel/chainparams.cpp

src/kernel/chainparams.h

src/wallet/sqlite.cpp

src/wallet/sqlite.h

src/wallet/transaction.cpp

src/wallet/transaction.h

src/wallet/dump.cpp

src/wallet/dump.h

src/wallet/init.cpp

src/wallet/walletutil.cpp

src/wallet/walletutil.h

src/wallet/wallettool.cpp

src/wallet/wallettool.h

src/wallet/export.h

src/wallet/migrate.cpp

src/wallet/migrate.h

src/wallet/db.h

src/wallet/walletdb.cpp

src/wallet/interfaces.cpp

src/wallet/scriptpubkeyman.cpp

src/wallet/scriptpubkeyman.h

src/kernel/bitcoinkernel.cpp

src/kernel/bitcoinkernel.h

src/kernel/bitcoinkernel_wrapper.h

src/node/chainstate.cpp

src/node/chainstate.h

src/node/blockstorage.cpp

src/node/blockstorage.h

src/node/mempool_persist.cpp

src/node/mempool_persist.h

src/node/utxo_snapshot.cpp

src/node/utxo_snapshot.h

src/node/kernel_notifications.cpp

src/node/kernel_notifications.h

src/node/blockmanager_args.cpp

src/kernel/blockmanager_opts.h

src/util/expected.cpp

src/policy/settings.h

src/util/types.h

src/kernel/messagestartchars.h

src/kernel/warning.h

src/util/exception.h

src/common/license_info.h

src/node/coins_view_args.h

src/node/database_args.h

src/util/batchpriority.h

src/util/ui_change_type.h

src/node/coins_view_args.cpp

src/node/peerman_args.h

src/util/serfloat.h

src/node/blockmanager_args.h

src/node/database_args.cpp

src/util/overloaded.h

src/interfaces/types.h

src/node/chainstatemanager_args.h

src/node/minisketchwrapper.h

src/util/macros.h

src/util/syserror.h

src/common/run_command.h

src/util/bytevectorhash.cpp

src/node/mempool_persist_args.cpp

src/util/exec.h

src/util/rbf.h

src/crypto/hex_base.h

src/node/mempool_persist_args.h

src/interfaces/echo.h

src/util/any.h

src/util/batchpriority.cpp

src/util/threadnames.h

src/node/coin.h

src/node/mempool_args.h

src/util/asmap.h

src/util/bytevectorhash.h

src/node/context.cpp

src/util/insert.h

src/util/readwritefile.h

src/node/peerman_args.cpp

src/node/interface_ui.cpp

src/interfaces/handler.h

src/node/mining_args.h

src/util/hasher.cpp

src/common/init.h

src/kernel/mempool_limits.h

src/common/system.h

src/crypto/sha3.h

src/util/threadinterrupt.cpp

src/node/protocol_version.h

src/util/exception.cpp

src/common/messages.h

src/node/connection_types.cpp

src/util/bip32.h

src/common/license_info.cpp

src/util/stdmutex.h

src/common/run_command.cpp

src/util/check.cpp

src/util/golombrice.h

src/node/types.h

src/node/timeoffsets.h

src/util/readwritefile.cpp

src/util/fastrange.h

src/util/signalinterrupt.h

src/util/task_runner.h

src/util/syserror.cpp

src/common/interfaces.cpp

src/common/types.h

src/util/threadinterrupt.h

src/kernel/chainstatemanager_opts.h

src/node/psbt.h

src/policy/ephemeral_policy.h

src/util/trace.h

src/common/url.cpp

src/kernel/mempool_options.h

src/util/serfloat.cpp

src/kernel/notifications_interface.h

src/node/timeoffsets.cpp

src/node/warnings.cpp

src/util/hash_type.h

src/crypto/hex_base.cpp

src/node/eviction.h

src/util/tokenbucket.h

src/crypto/aes.h

src/common/pcp.h

src/util/feefrac.cpp

src/node/transaction.h

src/util/threadnames.cpp

src/common/signmessage.h

src/util/exec.cpp

src/util/signalinterrupt.cpp

src/clientversion.cpp

src/common/signmessage.cpp

src/compat/assumptions.h

src/compat/byteswap.h

src/deploymentinfo.cpp

src/deploymentinfo.h

src/deploymentstatus.cpp

src/deploymentstatus.h

src/dummywallet.cpp

src/external_signer.h

src/init/bitcoin-gui.cpp

src/init/bitcoin-node.cpp

src/init/bitcoin-qt.cpp

src/init/bitcoin-wallet.cpp

src/init/bitcoind.cpp

src/init/common.h

src/interfaces/init.h

src/interfaces/ipc.h

src/key_io.h

src/logging/categories.h

src/logging/timer.h

src/mapport.h

src/musig.h

src/net_permissions.h

src/netgroup.h

src/netmessagemaker.h

src/node/chainstatemanager_args.cpp

src/node/connection_types.h

src/node/context.h

src/node/interface_ui.h

src/node/mempool_args.cpp

src/node/mining_args.cpp

src/node/minisketchwrapper.cpp

src/node/txreconciliation.h

src/policy/fees/estimator_args.cpp

src/policy/fees/estimator_args.h

src/policy/fees/estimator_man.cpp

src/policy/fees/estimator_man.h

src/policy/packages.h

src/policy/rbf.h

src/policy/truc_policy.h

src/pow.h

src/primitives/block.cpp

src/randomenv.h

src/rest.h

src/script/keyorigin.h

src/script/parsing.cpp

src/script/parsing.h

src/script/script_error.h

src/script/sigcache.cpp

src/script/sigcache.h

src/script/solver.h

src/script/verify_flags.h

src/semaphore_grant.h

src/signet.h

src/span.h

src/support/allocators/secure.h

src/support/allocators/zeroafterfree.h

src/util/tokenpipe.cpp

src/util/translation.h

src/util/vector.h

src/versionbits.h

src/versionbits_impl.h

src/wallet/external_signer_scriptpubkeyman.h

src/wallet/fees.h

src/wallet/load.h

src/wallet/receive.h

src/wallet/rpc/wallet.h

src/wallet/types.h

src/walletinitinterface.h

src/zmq/zmqabstractnotifier.cpp

Independent explanations by MyBitcoinExplorer. Not affiliated with or endorsed by Bitcoin Core. Guides are educational and do not replace the source or its tests.

Bitcoin Core source © its contributors, distributed under the MIT license. Original notices and bundled third-party licenses are retained in the source tree.