LCOV - code coverage report
Current view: top level - src/test/fuzz - headerssync.cpp (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 4 65 6.2 %
Date: 2023-11-06 23:13:05 Functions: 1 10 10.0 %
Branches: 4 78 5.1 %

           Branch data     Line data    Source code
       1                 :            : #include <arith_uint256.h>
       2                 :            : #include <chain.h>
       3                 :            : #include <chainparams.h>
       4                 :            : #include <headerssync.h>
       5                 :            : #include <test/fuzz/fuzz.h>
       6                 :            : #include <test/fuzz/util.h>
       7                 :            : #include <test/util/setup_common.h>
       8                 :            : #include <uint256.h>
       9                 :            : #include <util/chaintype.h>
      10                 :            : #include <util/time.h>
      11                 :            : #include <validation.h>
      12                 :            : 
      13                 :            : #include <iterator>
      14                 :            : #include <vector>
      15                 :            : 
      16                 :          0 : static void initialize_headers_sync_state_fuzz()
      17         [ +  - ]:          2 : {
      18 [ +  - ][ #  # ]:          2 :     static const auto testing_setup = MakeNoLogFileContext<>(
         [ #  # ][ #  # ]
      19                 :            :         /*chain_type=*/ChainType::MAIN);
      20                 :          0 : }
      21                 :            : 
      22                 :          0 : void MakeHeadersContinuous(
      23                 :            :     const CBlockHeader& genesis_header,
      24                 :            :     const std::vector<CBlockHeader>& all_headers,
      25                 :            :     std::vector<CBlockHeader>& new_headers)
      26                 :            : {
      27                 :          0 :     Assume(!new_headers.empty());
      28                 :            : 
      29                 :          0 :     const CBlockHeader* prev_header{
      30         [ #  # ]:          0 :         all_headers.empty() ? &genesis_header : &all_headers.back()};
      31                 :            : 
      32         [ #  # ]:          0 :     for (auto& header : new_headers) {
      33                 :          0 :         header.hashPrevBlock = prev_header->GetHash();
      34                 :            : 
      35                 :          0 :         prev_header = &header;
      36                 :            :     }
      37                 :          0 : }
      38                 :            : 
      39                 :          0 : class FuzzedHeadersSyncState : public HeadersSyncState
      40                 :            : {
      41                 :            : public:
      42                 :          0 :     FuzzedHeadersSyncState(const unsigned commit_offset, const CBlockIndex* chain_start, const arith_uint256& minimum_required_work)
      43                 :          0 :         : HeadersSyncState(/*id=*/0, Params().GetConsensus(), chain_start, minimum_required_work)
      44                 :            :     {
      45                 :          0 :         const_cast<unsigned&>(m_commit_offset) = commit_offset;
      46                 :          0 :     }
      47                 :            : };
      48                 :            : 
      49         [ +  - ]:          4 : FUZZ_TARGET(headers_sync_state, .init = initialize_headers_sync_state_fuzz)
      50                 :            : {
      51                 :          0 :     FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
      52                 :          0 :     auto mock_time{ConsumeTime(fuzzed_data_provider)};
      53                 :            : 
      54                 :          0 :     CBlockHeader genesis_header{Params().GenesisBlock()};
      55                 :          0 :     CBlockIndex start_index(genesis_header);
      56                 :            : 
      57         [ #  # ]:          0 :     if (mock_time < start_index.GetMedianTimePast()) return;
      58                 :          0 :     SetMockTime(mock_time);
      59                 :            : 
      60                 :          0 :     const uint256 genesis_hash = genesis_header.GetHash();
      61                 :          0 :     start_index.phashBlock = &genesis_hash;
      62                 :            : 
      63                 :          0 :     arith_uint256 min_work{UintToArith256(ConsumeUInt256(fuzzed_data_provider))};
      64                 :          0 :     FuzzedHeadersSyncState headers_sync(
      65                 :          0 :         /*commit_offset=*/fuzzed_data_provider.ConsumeIntegralInRange<unsigned>(1, 1024),
      66                 :            :         /*chain_start=*/&start_index,
      67                 :            :         /*minimum_required_work=*/min_work);
      68                 :            : 
      69                 :            :     // Store headers for potential redownload phase.
      70                 :          0 :     std::vector<CBlockHeader> all_headers;
      71                 :          0 :     std::vector<CBlockHeader>::const_iterator redownloaded_it;
      72                 :          0 :     bool presync{true};
      73                 :          0 :     bool requested_more{true};
      74                 :            : 
      75         [ #  # ]:          0 :     while (requested_more) {
      76                 :          0 :         std::vector<CBlockHeader> headers;
      77                 :            : 
      78                 :            :         // Consume headers from fuzzer or maybe replay headers if we got to the
      79                 :            :         // redownload phase.
      80 [ #  # ][ #  # ]:          0 :         if (presync || fuzzed_data_provider.ConsumeBool()) {
                 [ #  # ]
      81                 :          0 :             auto deser_headers = ConsumeDeserializable<std::vector<CBlockHeader>>(fuzzed_data_provider);
      82 [ #  # ][ #  # ]:          0 :             if (!deser_headers || deser_headers->empty()) return;
      83         [ +  - ]:          2 : 
      84 [ #  # ][ #  # ]:          0 :             if (fuzzed_data_provider.ConsumeBool()) {
      85         [ #  # ]:          0 :                 MakeHeadersContinuous(genesis_header, all_headers, *deser_headers);
      86                 :          0 :             }
      87                 :            : 
      88                 :          0 :             headers.swap(*deser_headers);
      89 [ #  # ][ #  # ]:          0 :         } else if (auto num_headers_left{std::distance(redownloaded_it, all_headers.cend())}; num_headers_left > 0) {
                 [ #  # ]
      90                 :            :             // Consume some headers from the redownload buffer (At least one
      91                 :            :             // header is consumed).
      92                 :          0 :             auto begin_it{redownloaded_it};
      93 [ #  # ][ #  # ]:          0 :             std::advance(redownloaded_it, fuzzed_data_provider.ConsumeIntegralInRange<int>(1, num_headers_left));
      94         [ #  # ]:          0 :             headers.insert(headers.cend(), begin_it, redownloaded_it);
      95                 :          0 :         }
      96                 :            : 
      97         [ #  # ]:          0 :         if (headers.empty()) return;
      98 [ #  # ][ #  # ]:          0 :         auto result = headers_sync.ProcessNextHeaders(headers, fuzzed_data_provider.ConsumeBool());
      99                 :          0 :         requested_more = result.request_more;
     100                 :            : 
     101         [ #  # ]:          0 :         if (result.request_more) {
     102         [ #  # ]:          0 :             if (presync) {
     103         [ #  # ]:          0 :                 all_headers.insert(all_headers.cend(), headers.cbegin(), headers.cend());
     104                 :            : 
     105 [ #  # ][ #  # ]:          0 :                 if (headers_sync.GetState() == HeadersSyncState::State::REDOWNLOAD) {
     106                 :          0 :                     presync = false;
     107                 :          0 :                     redownloaded_it = all_headers.cbegin();
     108                 :            : 
     109                 :            :                     // If we get to redownloading, the presynced headers need
     110                 :            :                     // to have the min amount of work on them.
     111 [ #  # ][ #  # ]:          0 :                     assert(CalculateHeadersWork(all_headers) >= min_work);
                 [ #  # ]
     112                 :          0 :                 }
     113                 :          0 :             }
     114                 :            : 
     115         [ #  # ]:          0 :             (void)headers_sync.NextHeadersRequestLocator();
     116                 :          0 :         }
     117         [ #  # ]:          0 :     }
     118         [ #  # ]:          0 : }

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