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.

10,825 bytes · SHA-256 c3690351b7d84dc6… · View upstream ↗

1// Copyright (c) 2009-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 <addrdb.h>
6#include <addrman.h>
7#include <addrman_impl.h>
8#include <blockencodings.h>
9#include <blockfilter.h>
10#include <chain.h>
11#include <coins.h>
12#include <common/args.h>
13#include <compressor.h>
14#include <consensus/merkle.h>
15#include <key.h>
16#include <merkleblock.h>
17#include <net.h>
18#include <netbase.h>
19#include <netgroup.h>
20#include <node/blockstorage.h>
21#include <node/utxo_snapshot.h>
22#include <primitives/block.h>
23#include <protocol.h>
24#include <psbt.h>
25#include <pubkey.h>
26#include <script/keyorigin.h>
27#include <streams.h>
28#include <test/fuzz/fuzz.h>
29#include <test/fuzz/util.h>
30#include <test/util/setup_common.h>
31#include <undo.h>
32
33#include <cstdint>
34#include <exception>
35#include <optional>
36#include <stdexcept>
37
38using kernel::CBlockFileInfo;
39using node::SnapshotMetadata;
40
41void initialize_deserialize()
42{
43    static const auto testing_setup = MakeNoLogFileContext<>();
44}
45
46#define FUZZ_TARGET_DESERIALIZE(name, code)                \
47    FUZZ_TARGET(name, .init = initialize_deserialize)      \
48    {                                                      \
49        try {                                              \
50            code                                           \
51        } catch (const invalid_fuzzing_input_exception&) { \
52        }                                                  \
53    }
54
55namespace {
56
57struct invalid_fuzzing_input_exception : public std::exception {
58};
59
60template <typename T, typename P>
61T Deserialize(DataStream&& ds, const P& params)
62{
63    T obj;
64    ds >> params(obj);
65    return obj;
66}
67
68template <typename T>
69DataStream Serialize(const T& obj)
70{
71    DataStream ds{};
72    ds << obj;
73    return ds;
74}
75
76template <typename T>
77T Deserialize(DataStream ds)
78{
79    T obj;
80    ds >> obj;
81    return obj;
82}
83
84template <typename T>
85void DeserializeFromFuzzingInput(FuzzBufferType buffer, T&& obj)
86{
87    try {
88        SpanReader{buffer} >> obj;
89    } catch (const std::ios_base::failure&) {
90        throw invalid_fuzzing_input_exception();
91    }
92    assert(buffer.empty() || !Serialize(obj).empty());
93}
94
95template <typename T>
96T DeserializeConstructFromFuzzingInput(FuzzBufferType buffer)
97{
98    try {
99        SpanReader reader{buffer};
100        T obj(deserialize, reader);
101        assert(buffer.empty() || !Serialize(obj).empty());
102        return obj;
103    } catch (const std::ios_base::failure&) {
104        throw invalid_fuzzing_input_exception();
105    }
106}
107
108template <typename T, typename P>
109void AssertEqualAfterSerializeDeserialize(const T& obj, const P& params)
110{
111    assert(Deserialize<T>(Serialize(params(obj)), params) == obj);
112}
113template <typename T>
114void AssertEqualAfterSerializeDeserialize(const T& obj)
115{
116    assert(Deserialize<T>(Serialize(obj)) == obj);
117}
118
119} // namespace
120
121FUZZ_TARGET_DESERIALIZE(block_filter_deserialize, {
122    BlockFilter block_filter;
123    DeserializeFromFuzzingInput(buffer, block_filter);
124})
125FUZZ_TARGET(addr_info_deserialize, .init = initialize_deserialize)
126{
127    FuzzedDataProvider fdp{buffer.data(), buffer.size()};
128    (void)ConsumeDeserializable<AddrInfo>(fdp, ConsumeDeserializationParams<CAddress::SerParams>(fdp));
129}
130FUZZ_TARGET_DESERIALIZE(block_file_info_deserialize, {
131    CBlockFileInfo block_file_info;
132    DeserializeFromFuzzingInput(buffer, block_file_info);
133})
134FUZZ_TARGET_DESERIALIZE(block_header_and_short_txids_deserialize, {
135    CBlockHeaderAndShortTxIDs block_header_and_short_txids;
136    DeserializeFromFuzzingInput(buffer, block_header_and_short_txids);
137})
138FUZZ_TARGET_DESERIALIZE(fee_rate_deserialize, {
139    CFeeRate fee_rate;
140    DeserializeFromFuzzingInput(buffer, fee_rate);
141    AssertEqualAfterSerializeDeserialize(fee_rate);
142})
143FUZZ_TARGET_DESERIALIZE(merkle_block_deserialize, {
144    CMerkleBlock merkle_block;
145    DeserializeFromFuzzingInput(buffer, merkle_block);
146})
147FUZZ_TARGET_DESERIALIZE(out_point_deserialize, {
148    COutPoint out_point;
149    DeserializeFromFuzzingInput(buffer, out_point);
150    AssertEqualAfterSerializeDeserialize(out_point);
151})
152FUZZ_TARGET_DESERIALIZE(partial_merkle_tree_deserialize, {
153    CPartialMerkleTree partial_merkle_tree;
154    DeserializeFromFuzzingInput(buffer, partial_merkle_tree);
155})
156FUZZ_TARGET_DESERIALIZE(pub_key_deserialize, {
157    CPubKey pub_key;
158    DeserializeFromFuzzingInput(buffer, pub_key);
159    AssertEqualAfterSerializeDeserialize(pub_key);
160})
161FUZZ_TARGET_DESERIALIZE(script_deserialize, {
162    CScript script;
163    DeserializeFromFuzzingInput(buffer, script);
164})
165FUZZ_TARGET_DESERIALIZE(tx_in_deserialize, {
166    CTxIn tx_in;
167    DeserializeFromFuzzingInput(buffer, tx_in);
168    AssertEqualAfterSerializeDeserialize(tx_in);
169})
170FUZZ_TARGET_DESERIALIZE(flat_file_pos_deserialize, {
171    FlatFilePos flat_file_pos;
172    DeserializeFromFuzzingInput(buffer, flat_file_pos);
173    AssertEqualAfterSerializeDeserialize(flat_file_pos);
174})
175FUZZ_TARGET_DESERIALIZE(key_origin_info_deserialize, {
176    KeyOriginInfo key_origin_info;
177    DeserializeFromFuzzingInput(buffer, key_origin_info);
178    AssertEqualAfterSerializeDeserialize(key_origin_info);
179})
180FUZZ_TARGET_DESERIALIZE(partially_signed_transaction_deserialize, {
181    PartiallySignedTransaction partially_signed_transaction = DeserializeConstructFromFuzzingInput<PartiallySignedTransaction>(buffer);
182})
183FUZZ_TARGET_DESERIALIZE(prefilled_transaction_deserialize, {
184    PrefilledTransaction prefilled_transaction;
185    DeserializeFromFuzzingInput(buffer, prefilled_transaction);
186})
187FUZZ_TARGET_DESERIALIZE(psbt_input_deserialize, {
188    PSBTInput psbt_input(0, Txid{}, 0);
189    DeserializeFromFuzzingInput(buffer, psbt_input);
190})
191FUZZ_TARGET_DESERIALIZE(psbt_output_deserialize, {
192    PSBTOutput psbt_output(0, 0, CScript());
193    DeserializeFromFuzzingInput(buffer, psbt_output);
194})
195FUZZ_TARGET_DESERIALIZE(block_deserialize, {
196    CBlock block;
197    DeserializeFromFuzzingInput(buffer, TX_WITH_WITNESS(block));
198})
199FUZZ_TARGET_DESERIALIZE(blocklocator_deserialize, {
200    CBlockLocator bl;
201    DeserializeFromFuzzingInput(buffer, bl);
202})
203FUZZ_TARGET_DESERIALIZE(blockmerkleroot, {
204    CBlock block;
205    DeserializeFromFuzzingInput(buffer, TX_WITH_WITNESS(block));
206    bool mutated;
207    BlockMerkleRoot(block, &mutated);
208})
209FUZZ_TARGET_DESERIALIZE(blockheader_deserialize, {
210    CBlockHeader bh;
211    DeserializeFromFuzzingInput(buffer, bh);
212})
213FUZZ_TARGET_DESERIALIZE(txundo_deserialize, {
214    CTxUndo tu;
215    DeserializeFromFuzzingInput(buffer, tu);
216})
217FUZZ_TARGET_DESERIALIZE(blockundo_deserialize, {
218    CBlockUndo bu;
219    DeserializeFromFuzzingInput(buffer, bu);
220})
221FUZZ_TARGET_DESERIALIZE(coins_deserialize, {
222    Coin coin;
223    DeserializeFromFuzzingInput(buffer, coin);
224})
225FUZZ_TARGET(netaddr_deserialize, .init = initialize_deserialize)
226{
227    FuzzedDataProvider fdp{buffer.data(), buffer.size()};
228    const auto maybe_na{ConsumeDeserializable<CNetAddr>(fdp, ConsumeDeserializationParams<CNetAddr::SerParams>(fdp))};
229    if (!maybe_na) return;
230    const CNetAddr& na{*maybe_na};
231    if (na.IsAddrV1Compatible()) {
232        AssertEqualAfterSerializeDeserialize(na, CNetAddr::V1);
233    }
234    AssertEqualAfterSerializeDeserialize(na, CNetAddr::V2);
235}
236FUZZ_TARGET(service_deserialize, .init = initialize_deserialize)
237{
238    FuzzedDataProvider fdp{buffer.data(), buffer.size()};
239    const auto ser_params{ConsumeDeserializationParams<CNetAddr::SerParams>(fdp)};
240    const auto maybe_s{ConsumeDeserializable<CService>(fdp, ser_params)};
241    if (!maybe_s) return;
242    const CService& s{*maybe_s};
243    if (s.IsAddrV1Compatible()) {
244        AssertEqualAfterSerializeDeserialize(s, CNetAddr::V1);
245    }
246    AssertEqualAfterSerializeDeserialize(s, CNetAddr::V2);
247    if (ser_params.enc == CNetAddr::Encoding::V1) {
248        assert(s.IsAddrV1Compatible());
249    }
250}

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.