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// Copyright (c) 2021 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 <chainparams.h>
#include <consensus/validation.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/util/mining.h>
#include <test/util/setup_common.h>
#include <validation.h>
#include <validationinterface.h>
namespace {
const std::vector<std::shared_ptr<CBlock>>* g_chain;
void initialize_chain()
{
const auto params{CreateChainParams(ArgsManager{}, CBaseChainParams::REGTEST)};
static const auto chain{CreateBlockChain(2 * COINBASE_MATURITY, *params)};
g_chain = &chain;
}
FUZZ_TARGET_INIT(utxo_snapshot, initialize_chain)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
std::unique_ptr<const TestingSetup> setup{MakeNoLogFileContext<const TestingSetup>()};
const auto& node = setup->m_node;
auto& chainman{*node.chainman};
const auto snapshot_path = gArgs.GetDataDirNet() / "fuzzed_snapshot.dat";
Assert(!chainman.SnapshotBlockhash());
{
CAutoFile outfile{fsbridge::fopen(snapshot_path, "wb"), SER_DISK, CLIENT_VERSION};
const auto file_data{ConsumeRandomLengthByteVector(fuzzed_data_provider)};
outfile << Span<const uint8_t>{file_data};
}
const auto ActivateFuzzedSnapshot{[&] {
CAutoFile infile{fsbridge::fopen(snapshot_path, "rb"), SER_DISK, CLIENT_VERSION};
SnapshotMetadata metadata;
try {
infile >> metadata;
} catch (const std::ios_base::failure&) {
return false;
}
return chainman.ActivateSnapshot(infile, metadata, /* in_memory */ true);
}};
if (fuzzed_data_provider.ConsumeBool()) {
for (const auto& block : *g_chain) {
BlockValidationState dummy;
bool processed{chainman.ProcessNewBlockHeaders({*block}, dummy, ::Params())};
Assert(processed);
const auto* index{WITH_LOCK(::cs_main, return chainman.m_blockman.LookupBlockIndex(block->GetHash()))};
Assert(index);
}
}
if (ActivateFuzzedSnapshot()) {
LOCK(::cs_main);
Assert(!chainman.ActiveChainstate().m_from_snapshot_blockhash->IsNull());
Assert(*chainman.ActiveChainstate().m_from_snapshot_blockhash ==
*chainman.SnapshotBlockhash());
const auto& coinscache{chainman.ActiveChainstate().CoinsTip()};
int64_t chain_tx{};
for (const auto& block : *g_chain) {
Assert(coinscache.HaveCoin(COutPoint{block->vtx.at(0)->GetHash(), 0}));
const auto* index{chainman.m_blockman.LookupBlockIndex(block->GetHash())};
const auto num_tx{Assert(index)->nTx};
Assert(num_tx == 1);
chain_tx += num_tx;
}
Assert(g_chain->size() == coinscache.GetCacheSize());
Assert(chain_tx == chainman.ActiveTip()->nChainTx);
} else {
Assert(!chainman.SnapshotBlockhash());
Assert(!chainman.ActiveChainstate().m_from_snapshot_blockhash);
}
// Snapshot should refuse to load a second time regardless of validity
Assert(!ActivateFuzzedSnapshot());
}
} // namespace
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