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 <net.h>
 6  #include <protocol.h>
 7  #include <test/fuzz/FuzzedDataProvider.h>
 8  #include <test/fuzz/fuzz.h>
 9  #include <test/fuzz/util.h>
10  #include <test/fuzz/util/net.h>
11  
12  #include <algorithm>
13  #include <cassert>
14  #include <cstdint>
15  #include <optional>
16  #include <vector>
17  
18  FUZZ_TARGET(node_eviction)
19  {
20      FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
21      std::vector<NodeEvictionCandidate> eviction_candidates;
22      LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000)
23      {
24          eviction_candidates.push_back({
25              /*id=*/fuzzed_data_provider.ConsumeIntegral<NodeId>(),
26              /*m_connected=*/ConsumeTime(fuzzed_data_provider),
27              /*m_min_ping_time=*/ConsumeDuration<decltype(NodeEvictionCandidate::m_min_ping_time)>(fuzzed_data_provider, /*min=*/std::chrono::years{-1}, /*max=*/decltype(CNode::m_min_ping_time.load())::max()),
28              /*m_last_block_time=*/ConsumeTime(fuzzed_data_provider).time_since_epoch(),
29              /*m_last_tx_time=*/ConsumeTime(fuzzed_data_provider).time_since_epoch(),
30              /*fRelevantServices=*/fuzzed_data_provider.ConsumeBool(),
31              /*m_relay_txs=*/fuzzed_data_provider.ConsumeBool(),
32              /*fBloomFilter=*/fuzzed_data_provider.ConsumeBool(),
33              /*nKeyedNetGroup=*/fuzzed_data_provider.ConsumeIntegral<uint64_t>(),
34              /*prefer_evict=*/fuzzed_data_provider.ConsumeBool(),
35              /*m_is_local=*/fuzzed_data_provider.ConsumeBool(),
36              /*m_network=*/fuzzed_data_provider.PickValueInArray(ALL_NETWORKS),
37              /*m_noban=*/fuzzed_data_provider.ConsumeBool(),
38              /*m_conn_type=*/fuzzed_data_provider.PickValueInArray(ALL_CONNECTION_TYPES),
39          });
40      }
41      // Make a copy since eviction_candidates may be in some valid but otherwise
42      // indeterminate state after the SelectNodeToEvict(&&) call.
43      const std::vector<NodeEvictionCandidate> eviction_candidates_copy = eviction_candidates;
44      const std::optional<NodeId> node_to_evict = SelectNodeToEvict(std::move(eviction_candidates));
45      if (node_to_evict) {
46          assert(std::any_of(eviction_candidates_copy.begin(), eviction_candidates_copy.end(), [&node_to_evict](const NodeEvictionCandidate& eviction_candidate) { return *node_to_evict == eviction_candidate.id; }));
47      }
48  }