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       1                 :            : // Copyright (c) 2021-2022 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 <chainparams.h>
       6                 :            : #include <consensus/validation.h>
       7                 :            : #include <node/utxo_snapshot.h>
       8                 :            : #include <test/fuzz/FuzzedDataProvider.h>
       9                 :            : #include <test/fuzz/fuzz.h>
      10                 :            : #include <test/fuzz/util.h>
      11                 :            : #include <test/util/mining.h>
      12                 :            : #include <test/util/setup_common.h>
      13                 :            : #include <util/chaintype.h>
      14                 :            : #include <util/fs.h>
      15                 :            : #include <validation.h>
      16                 :            : #include <validationinterface.h>
      17         [ +  - ]:          2 : 
      18         [ +  - ]:          2 : using node::SnapshotMetadata;
      19                 :            : 
      20                 :            : namespace {
      21                 :            : 
      22                 :            : const std::vector<std::shared_ptr<CBlock>>* g_chain;
      23                 :            : 
      24                 :          0 : void initialize_chain()
      25                 :            : {
      26         [ #  # ]:          0 :     const auto params{CreateChainParams(ArgsManager{}, ChainType::REGTEST)};
      27 [ #  # ][ #  # ]:          0 :     static const auto chain{CreateBlockChain(2 * COINBASE_MATURITY, *params)};
                 [ #  # ]
      28                 :          0 :     g_chain = &chain;
      29                 :          0 : }
      30                 :            : 
      31         [ +  - ]:          4 : FUZZ_TARGET(utxo_snapshot, .init = initialize_chain)
      32                 :            : {
      33                 :          0 :     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
      34         [ #  # ]:          0 :     std::unique_ptr<const TestingSetup> setup{MakeNoLogFileContext<const TestingSetup>()};
      35                 :          0 :     const auto& node = setup->m_node;
      36                 :          0 :     auto& chainman{*node.chainman};
      37                 :            : 
      38 [ #  # ][ #  # ]:          0 :     const auto snapshot_path = gArgs.GetDataDirNet() / "fuzzed_snapshot.dat";
                 [ #  # ]
      39                 :            : 
      40 [ #  # ][ #  # ]:          0 :     Assert(!chainman.SnapshotBlockhash());
      41                 :            : 
      42                 :            :     {
      43 [ #  # ][ #  # ]:          0 :         AutoFile outfile{fsbridge::fopen(snapshot_path, "wb")};
      44                 :          0 :         const auto file_data{ConsumeRandomLengthByteVector(fuzzed_data_provider)};
      45 [ #  # ][ #  # ]:          0 :         outfile << Span{file_data};
      46                 :          0 :     }
      47                 :            : 
      48                 :          0 :     const auto ActivateFuzzedSnapshot{[&] {
      49         [ #  # ]:          0 :         AutoFile infile{fsbridge::fopen(snapshot_path, "rb")};
      50         [ #  # ]:          0 :         SnapshotMetadata metadata;
      51                 :          2 :         try {
      52         [ #  # ]:          0 :             infile >> metadata;
      53         [ #  # ]:          0 :         } catch (const std::ios_base::failure&) {
      54                 :          0 :             return false;
      55         [ #  # ]:          0 :         }
      56         [ #  # ]:          0 :         return chainman.ActivateSnapshot(infile, metadata, /*in_memory=*/true);
      57                 :          0 :     }};
      58                 :            : 
      59 [ #  # ][ #  # ]:          0 :     if (fuzzed_data_provider.ConsumeBool()) {
      60         [ #  # ]:          0 :         for (const auto& block : *g_chain) {
      61                 :          0 :             BlockValidationState dummy;
      62 [ #  # ][ #  # ]:          0 :             bool processed{chainman.ProcessNewBlockHeaders({*block}, true, dummy)};
      63         [ #  # ]:          0 :             Assert(processed);
      64 [ #  # ][ #  # ]:          0 :             const auto* index{WITH_LOCK(::cs_main, return chainman.m_blockman.LookupBlockIndex(block->GetHash()))};
         [ #  # ][ #  # ]
      65         [ #  # ]:          0 :             Assert(index);
      66                 :          0 :         }
      67                 :          0 :     }
      68                 :            : 
      69 [ #  # ][ #  # ]:          0 :     if (ActivateFuzzedSnapshot()) {
      70 [ #  # ][ #  # ]:          0 :         LOCK(::cs_main);
      71 [ #  # ][ #  # ]:          0 :         Assert(!chainman.ActiveChainstate().m_from_snapshot_blockhash->IsNull());
                 [ #  # ]
      72 [ #  # ][ #  # ]:          0 :         Assert(*chainman.ActiveChainstate().m_from_snapshot_blockhash ==
         [ #  # ][ #  # ]
      73                 :            :                *chainman.SnapshotBlockhash());
      74 [ #  # ][ #  # ]:          0 :         const auto& coinscache{chainman.ActiveChainstate().CoinsTip()};
      75                 :          0 :         int64_t chain_tx{};
      76         [ #  # ]:          0 :         for (const auto& block : *g_chain) {
      77 [ #  # ][ #  # ]:          0 :             Assert(coinscache.HaveCoin(COutPoint{block->vtx.at(0)->GetHash(), 0}));
         [ #  # ][ #  # ]
                 [ #  # ]
      78 [ #  # ][ #  # ]:          0 :             const auto* index{chainman.m_blockman.LookupBlockIndex(block->GetHash())};
      79         [ #  # ]:          0 :             const auto num_tx{Assert(index)->nTx};
      80         [ #  # ]:          0 :             Assert(num_tx == 1);
      81                 :          0 :             chain_tx += num_tx;
      82                 :            :         }
      83 [ +  - ][ #  # ]:          2 :         Assert(g_chain->size() == coinscache.GetCacheSize());
                 [ #  # ]
      84 [ #  # ][ #  # ]:          0 :         Assert(chain_tx == chainman.ActiveTip()->nChainTx);
      85                 :          0 :     } else {
      86 [ #  # ][ #  # ]:          0 :         Assert(!chainman.SnapshotBlockhash());
      87 [ #  # ][ #  # ]:          0 :         Assert(!chainman.ActiveChainstate().m_from_snapshot_blockhash);
      88                 :            :     }
      89                 :            :     // Snapshot should refuse to load a second time regardless of validity
      90 [ #  # ][ #  # ]:          0 :     Assert(!ActivateFuzzedSnapshot());
      91                 :          0 : }
      92                 :            : } // namespace