Inside Bitcoin

1// Copyright (c) 2011-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 <bench/bench.h>
6#include <chain.h>
7#include <chainparams.h>
8#include <consensus/consensus.h>
9#include <consensus/merkle.h>
10#include <consensus/validation.h>
11#include <pow.h>
12#include <primitives/block.h>
13#include <primitives/transaction.h>
14#include <random.h>
15#include <script/script.h>
16#include <sync.h>
17#include <test/util/setup_common.h>
18#include <uint256.h>
19#include <util/check.h>
20#include <validation.h>
21
22#include <cstdint>
23#include <memory>
24#include <string>
25#include <utility>
26#include <vector>
27
28
29static void DuplicateInputs(benchmark::Bench& bench)
30{
31    const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
32
33    const CScript SCRIPT_PUB{CScript(OP_TRUE)};
34
35    const CChainParams& chainparams = Params();
36
37    CBlock block{};
38    CMutableTransaction coinbaseTx{};
39    CMutableTransaction naughtyTx{};
40
41    LOCK(cs_main);
42    CBlockIndex* pindexPrev = testing_setup->m_node.chainman->ActiveChain().Tip();
43    assert(pindexPrev != nullptr);
44    block.nBits = GetNextWorkRequired(pindexPrev, &block, chainparams.GetConsensus());
45    block.nNonce = 0;
46    auto nHeight = pindexPrev->nHeight + 1;
47
48    // Make a coinbase TX
49    coinbaseTx.vin.resize(1);
50    coinbaseTx.vin[0].prevout.SetNull();
51    coinbaseTx.vout.resize(1);
52    coinbaseTx.vout[0].scriptPubKey = SCRIPT_PUB;
53    coinbaseTx.vout[0].nValue = GetBlockSubsidy(nHeight, chainparams.GetConsensus());
54    coinbaseTx.vin[0].scriptSig = CScript() << nHeight << OP_0;
55
56
57    naughtyTx.vout.resize(1);
58    naughtyTx.vout[0].nValue = 0;
59    naughtyTx.vout[0].scriptPubKey = SCRIPT_PUB;
60
61    uint64_t n_inputs = (((MAX_BLOCK_SERIALIZED_SIZE / WITNESS_SCALE_FACTOR) - (CTransaction(coinbaseTx).ComputeTotalSize() + CTransaction(naughtyTx).ComputeTotalSize())) / 41) - 100;
62    for (uint64_t x = 0; x < (n_inputs - 1); ++x) {
63        naughtyTx.vin.emplace_back(Txid::FromUint256(GetRandHash()), 0, CScript(), 0);
64    }
65    naughtyTx.vin.emplace_back(naughtyTx.vin.back());
66
67    block.vtx.push_back(MakeTransactionRef(std::move(coinbaseTx)));
68    block.vtx.push_back(MakeTransactionRef(std::move(naughtyTx)));
69
70    block.hashMerkleRoot = BlockMerkleRoot(block);
71
72    bench.run([&] {
73        BlockValidationState cvstate{};
74        assert(!CheckBlock(block, cvstate, chainparams.GetConsensus(), false, false));
75        assert(cvstate.GetRejectReason() == "bad-txns-inputs-duplicate");
76    });
77}
78
79BENCHMARK(DuplicateInputs);
80