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| 1 | +#include <blockencodings.h> |
| 2 | +#include <net.h> |
| 3 | +#include <net_processing.h> |
| 4 | +#include <netmessagemaker.h> |
| 5 | +#include <node/peerman_args.h> |
| 6 | +#include <pow.h> |
| 7 | +#include <test/fuzz/FuzzedDataProvider.h> |
| 8 | +#include <test/fuzz/fuzz.h> |
| 9 | +#include <test/fuzz/util.h> |
| 10 | +#include <test/util/net.h> |
| 11 | +#include <test/util/script.h> |
| 12 | +#include <test/util/setup_common.h> |
| 13 | +#include <validation.h> |
| 14 | + |
| 15 | +namespace { |
| 16 | +constexpr uint32_t FUZZ_MAX_HEADERS_RESULTS{16}; |
| 17 | + |
| 18 | +class HeadersSyncSetup : public TestingSetup |
| 19 | +{ |
| 20 | + std::vector<CNode*> m_connections; |
| 21 | + |
| 22 | +public: |
| 23 | + HeadersSyncSetup(const ChainType chain_type = ChainType::MAIN, |
| 24 | + TestOpts opts = {}) |
| 25 | + : TestingSetup(chain_type, opts) |
| 26 | + { |
| 27 | + PeerManager::Options peerman_opts; |
| 28 | + node::ApplyArgsManOptions(*m_node.args, peerman_opts); |
| 29 | + peerman_opts.max_headers_result = FUZZ_MAX_HEADERS_RESULTS; |
| 30 | + m_node.peerman = PeerManager::make(*m_node.connman, *m_node.addrman, |
| 31 | + m_node.banman.get(), *m_node.chainman, |
| 32 | + *m_node.mempool, *m_node.warnings, peerman_opts); |
| 33 | + |
| 34 | + CConnman::Options options; |
| 35 | + options.m_msgproc = m_node.peerman.get(); |
| 36 | + m_node.connman->Init(options); |
| 37 | + } |
| 38 | + |
| 39 | + void ResetAndInitialize() EXCLUSIVE_LOCKS_REQUIRED(NetEventsInterface::g_msgproc_mutex); |
| 40 | + void SendMessage(FuzzedDataProvider& fuzzed_data_provider, CSerializedNetMsg&& msg) |
| 41 | + EXCLUSIVE_LOCKS_REQUIRED(NetEventsInterface::g_msgproc_mutex); |
| 42 | +}; |
| 43 | + |
| 44 | +void HeadersSyncSetup::ResetAndInitialize() |
| 45 | +{ |
| 46 | + m_connections.clear(); |
| 47 | + auto& connman = static_cast<ConnmanTestMsg&>(*m_node.connman); |
| 48 | + connman.StopNodes(); |
| 49 | + |
| 50 | + NodeId id{0}; |
| 51 | + std::vector<ConnectionType> conn_types = { |
| 52 | + ConnectionType::OUTBOUND_FULL_RELAY, |
| 53 | + ConnectionType::BLOCK_RELAY, |
| 54 | + ConnectionType::INBOUND |
| 55 | + }; |
| 56 | + |
| 57 | + for (auto conn_type : conn_types) { |
| 58 | + CAddress addr{}; |
| 59 | + m_connections.push_back(new CNode(id++, nullptr, addr, 0, 0, addr, "", conn_type, false)); |
| 60 | + CNode& p2p_node = *m_connections.back(); |
| 61 | + |
| 62 | + connman.Handshake( |
| 63 | + /*node=*/p2p_node, |
| 64 | + /*successfully_connected=*/true, |
| 65 | + /*remote_services=*/ServiceFlags(NODE_NETWORK | NODE_WITNESS), |
| 66 | + /*local_services=*/ServiceFlags(NODE_NETWORK | NODE_WITNESS), |
| 67 | + /*version=*/PROTOCOL_VERSION, |
| 68 | + /*relay_txs=*/true); |
| 69 | + |
| 70 | + connman.AddTestNode(p2p_node); |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +void HeadersSyncSetup::SendMessage(FuzzedDataProvider& fuzzed_data_provider, CSerializedNetMsg&& msg) |
| 75 | +{ |
| 76 | + auto& connman = static_cast<ConnmanTestMsg&>(*m_node.connman); |
| 77 | + CNode& connection = *PickValue(fuzzed_data_provider, m_connections); |
| 78 | + |
| 79 | + connman.FlushSendBuffer(connection); |
| 80 | + (void)connman.ReceiveMsgFrom(connection, std::move(msg)); |
| 81 | + connection.fPauseSend = false; |
| 82 | + try { |
| 83 | + connman.ProcessMessagesOnce(connection); |
| 84 | + } catch (const std::ios_base::failure&) { |
| 85 | + } |
| 86 | + m_node.peerman->SendMessages(&connection); |
| 87 | +} |
| 88 | + |
| 89 | +CBlockHeader ConsumeHeader(FuzzedDataProvider& fuzzed_data_provider, const uint256& prev_hash, uint32_t prev_nbits) |
| 90 | +{ |
| 91 | + CBlockHeader header; |
| 92 | + header.nNonce = 0; |
| 93 | + // Either use the previous difficulty or let the fuzzer choose |
| 94 | + header.nBits = fuzzed_data_provider.ConsumeBool() ? |
| 95 | + prev_nbits : |
| 96 | + fuzzed_data_provider.ConsumeIntegralInRange<uint32_t>(0x17058EBE, 0x1D00FFFF); |
| 97 | + header.nTime = ConsumeTime(fuzzed_data_provider); |
| 98 | + header.hashPrevBlock = prev_hash; |
| 99 | + header.nVersion = fuzzed_data_provider.ConsumeIntegral<int32_t>(); |
| 100 | + return header; |
| 101 | +} |
| 102 | + |
| 103 | +CBlock ConsumeBlock(FuzzedDataProvider& fuzzed_data_provider, const uint256& prev_hash, uint32_t prev_nbits) |
| 104 | +{ |
| 105 | + auto header = ConsumeHeader(fuzzed_data_provider, prev_hash, prev_nbits); |
| 106 | + // In order to reach the headers acceptance logic, the block is |
| 107 | + // constructed in a way that will pass the mutation checks. |
| 108 | + CBlock block{header}; |
| 109 | + CMutableTransaction tx; |
| 110 | + tx.vin.resize(1); |
| 111 | + tx.vout.resize(1); |
| 112 | + tx.vout[0].nValue = 0; |
| 113 | + tx.vin[0].scriptSig.resize(2); |
| 114 | + block.vtx.push_back(MakeTransactionRef(tx)); |
| 115 | + block.hashMerkleRoot = block.vtx[0]->GetHash(); |
| 116 | + return block; |
| 117 | +} |
| 118 | + |
| 119 | +void FinalizeHeader(CBlockHeader& header) |
| 120 | +{ |
| 121 | + while (!CheckProofOfWork(header.GetHash(), header.nBits, Params().GetConsensus())) { |
| 122 | + ++(header.nNonce); |
| 123 | + } |
| 124 | +} |
| 125 | + |
| 126 | +// Global setup works for this test as state modification (specifically in the |
| 127 | +// block index) would indicate a bug. |
| 128 | +HeadersSyncSetup* g_testing_setup; |
| 129 | + |
| 130 | +void initialize() |
| 131 | +{ |
| 132 | + static auto setup = MakeNoLogFileContext<HeadersSyncSetup>(ChainType::MAIN, {.extra_args = {"-checkpoints=0"}}); |
| 133 | + g_testing_setup = setup.get(); |
| 134 | +} |
| 135 | +} // namespace |
| 136 | + |
| 137 | +FUZZ_TARGET(p2p_headers_presync, .init = initialize) |
| 138 | +{ |
| 139 | + ChainstateManager& chainman = *g_testing_setup->m_node.chainman; |
| 140 | + |
| 141 | + LOCK(NetEventsInterface::g_msgproc_mutex); |
| 142 | + |
| 143 | + g_testing_setup->ResetAndInitialize(); |
| 144 | + |
| 145 | + FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()}; |
| 146 | + |
| 147 | + CBlockHeader base{Params().GenesisBlock()}; |
| 148 | + SetMockTime(base.nTime); |
| 149 | + |
| 150 | + // The chain is just a single block, so this is equal to 1 |
| 151 | + size_t original_index_size{WITH_LOCK(cs_main, return chainman.m_blockman.m_block_index.size())}; |
| 152 | + |
| 153 | + LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 100) |
| 154 | + { |
| 155 | + auto finalized_block = [&]() { |
| 156 | + CBlock block = ConsumeBlock(fuzzed_data_provider, base.GetHash(), base.nBits); |
| 157 | + FinalizeHeader(block); |
| 158 | + return block; |
| 159 | + }; |
| 160 | + |
| 161 | + // Send low-work headers, compact blocks, and blocks |
| 162 | + CallOneOf( |
| 163 | + fuzzed_data_provider, |
| 164 | + [&]() NO_THREAD_SAFETY_ANALYSIS { |
| 165 | + // Send FUZZ_MAX_HEADERS_RESULTS headers |
| 166 | + std::vector<CBlock> headers; |
| 167 | + headers.resize(FUZZ_MAX_HEADERS_RESULTS); |
| 168 | + for (CBlock& header : headers) { |
| 169 | + header = ConsumeHeader(fuzzed_data_provider, base.GetHash(), base.nBits); |
| 170 | + FinalizeHeader(header); |
| 171 | + base = header; |
| 172 | + } |
| 173 | + |
| 174 | + auto headers_msg = NetMsg::Make(NetMsgType::HEADERS, TX_WITH_WITNESS(headers)); |
| 175 | + g_testing_setup->SendMessage(fuzzed_data_provider, std::move(headers_msg)); |
| 176 | + }, |
| 177 | + [&]() NO_THREAD_SAFETY_ANALYSIS { |
| 178 | + // Send a compact block |
| 179 | + auto block = finalized_block(); |
| 180 | + CBlockHeaderAndShortTxIDs cmpct_block{block, fuzzed_data_provider.ConsumeIntegral<uint64_t>()}; |
| 181 | + |
| 182 | + auto headers_msg = NetMsg::Make(NetMsgType::CMPCTBLOCK, TX_WITH_WITNESS(cmpct_block)); |
| 183 | + g_testing_setup->SendMessage(fuzzed_data_provider, std::move(headers_msg)); |
| 184 | + }, |
| 185 | + [&]() NO_THREAD_SAFETY_ANALYSIS { |
| 186 | + // Send a block |
| 187 | + auto block = finalized_block(); |
| 188 | + |
| 189 | + auto headers_msg = NetMsg::Make(NetMsgType::BLOCK, TX_WITH_WITNESS(block)); |
| 190 | + g_testing_setup->SendMessage(fuzzed_data_provider, std::move(headers_msg)); |
| 191 | + }); |
| 192 | + } |
| 193 | + |
| 194 | + // The headers/blocks sent in this test should never be stored, as the chains don't have the work required |
| 195 | + // to meet the anti-DoS work threshold. So, if at any point the block index grew in size, then there's a bug |
| 196 | + // in the headers pre-sync logic. |
| 197 | + assert(WITH_LOCK(cs_main, return chainman.m_blockman.m_block_index.size()) == original_index_size); |
| 198 | + |
| 199 | + g_testing_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue(); |
| 200 | +} |
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