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// Copyright (c) 2020-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <node/mempool_args.h>
#include <policy/rbf.h>
#include <primitives/transaction.h>
#include <sync.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/fuzz/util/mempool.h>
#include <test/util/setup_common.h>
#include <test/util/txmempool.h>
#include <txmempool.h>
#include <util/check.h>
#include <util/translation.h>
#include <cstdint>
#include <optional>
#include <string>
#include <vector>
namespace {
const BasicTestingSetup* g_setup;
} // namespace
const int NUM_ITERS = 10000;
std::vector<COutPoint> g_outpoints;
void initialize_rbf()
{
static const auto testing_setup = MakeNoLogFileContext<>();
g_setup = testing_setup.get();
}
void initialize_package_rbf()
{
static const auto testing_setup = MakeNoLogFileContext<>();
g_setup = testing_setup.get();
// Create a fixed set of unique "UTXOs" to source parents from
// to avoid fuzzer giving circular references
for (int i = 0; i < NUM_ITERS; ++i) {
g_outpoints.emplace_back();
g_outpoints.back().n = i;
}
}
FUZZ_TARGET(rbf, .init = initialize_rbf)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
SetMockTime(ConsumeTime(fuzzed_data_provider));
std::optional<CMutableTransaction> mtx = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider, TX_WITH_WITNESS);
if (!mtx) {
return;
}
bilingual_str error;
CTxMemPool pool{MemPoolOptionsForTest(g_setup->m_node), error};
Assert(error.empty());
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), NUM_ITERS)
{
const std::optional<CMutableTransaction> another_mtx = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider, TX_WITH_WITNESS);
if (!another_mtx) {
break;
}
const CTransaction another_tx{*another_mtx};
if (fuzzed_data_provider.ConsumeBool() && !mtx->vin.empty()) {
mtx->vin[0].prevout = COutPoint{another_tx.GetHash(), 0};
}
LOCK2(cs_main, pool.cs);
pool.addUnchecked(ConsumeTxMemPoolEntry(fuzzed_data_provider, another_tx));
}
const CTransaction tx{*mtx};
if (fuzzed_data_provider.ConsumeBool()) {
LOCK2(cs_main, pool.cs);
pool.addUnchecked(ConsumeTxMemPoolEntry(fuzzed_data_provider, tx));
}
{
LOCK(pool.cs);
(void)IsRBFOptIn(tx, pool);
}
}
FUZZ_TARGET(package_rbf, .init = initialize_package_rbf)
{
FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
SetMockTime(ConsumeTime(fuzzed_data_provider));
// "Real" virtual size is not important for this test since ConsumeTxMemPoolEntry generates its own virtual size values
// so we construct small transactions for performance reasons. Child simply needs an input for later to perhaps connect to parent.
CMutableTransaction child;
child.vin.resize(1);
bilingual_str error;
CTxMemPool pool{MemPoolOptionsForTest(g_setup->m_node), error};
Assert(error.empty());
// Add a bunch of parent-child pairs to the mempool, and remember them.
std::vector<CTransaction> mempool_txs;
size_t iter{0};
int32_t replacement_vsize = fuzzed_data_provider.ConsumeIntegralInRange<int32_t>(1, 1000000);
// Keep track of the total vsize of CTxMemPoolEntry's being added to the mempool to avoid overflow
// Add replacement_vsize since this is added to new diagram during RBF check
int64_t running_vsize_total{replacement_vsize};
LOCK2(cs_main, pool.cs);
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), NUM_ITERS)
{
// Make sure txns only have one input, and that a unique input is given to avoid circular references
CMutableTransaction parent;
assert(iter <= g_outpoints.size());
parent.vin.resize(1);
parent.vin[0].prevout = g_outpoints[iter++];
parent.vout.emplace_back(0, CScript());
mempool_txs.emplace_back(parent);
const auto parent_entry = ConsumeTxMemPoolEntry(fuzzed_data_provider, mempool_txs.back());
running_vsize_total += parent_entry.GetTxSize();
if (running_vsize_total > std::numeric_limits<int32_t>::max()) {
// We aren't adding this final tx to mempool, so we don't want to conflict with it
mempool_txs.pop_back();
break;
}
pool.addUnchecked(parent_entry);
if (fuzzed_data_provider.ConsumeBool()) {
child.vin[0].prevout = COutPoint{mempool_txs.back().GetHash(), 0};
}
mempool_txs.emplace_back(child);
const auto child_entry = ConsumeTxMemPoolEntry(fuzzed_data_provider, mempool_txs.back());
running_vsize_total += child_entry.GetTxSize();
if (running_vsize_total > std::numeric_limits<int32_t>::max()) {
// We aren't adding this final tx to mempool, so we don't want to conflict with it
mempool_txs.pop_back();
break;
}
pool.addUnchecked(child_entry);
if (fuzzed_data_provider.ConsumeBool()) {
pool.PrioritiseTransaction(mempool_txs.back().GetHash().ToUint256(), fuzzed_data_provider.ConsumeIntegralInRange<int32_t>(-100000, 100000));
}
}
// Pick some transactions at random to be the direct conflicts
CTxMemPool::setEntries direct_conflicts;
for (auto& tx : mempool_txs) {
if (fuzzed_data_provider.ConsumeBool()) {
direct_conflicts.insert(*pool.GetIter(tx.GetHash()));
}
}
// Calculate all conflicts:
CTxMemPool::setEntries all_conflicts;
for (auto& txiter : direct_conflicts) {
pool.CalculateDescendants(txiter, all_conflicts);
}
// Calculate the chunks for a replacement.
CAmount replacement_fees = ConsumeMoney(fuzzed_data_provider);
auto calc_results{pool.CalculateChunksForRBF(replacement_fees, replacement_vsize, direct_conflicts, all_conflicts)};
if (calc_results.has_value()) {
// Sanity checks on the chunks.
// Feerates are monotonically decreasing.
FeeFrac first_sum;
for (size_t i = 0; i < calc_results->first.size(); ++i) {
first_sum += calc_results->first[i];
if (i) assert(!(calc_results->first[i - 1] << calc_results->first[i]));
}
FeeFrac second_sum;
for (size_t i = 0; i < calc_results->second.size(); ++i) {
second_sum += calc_results->second[i];
if (i) assert(!(calc_results->second[i - 1] << calc_results->second[i]));
}
FeeFrac replaced;
for (auto txiter : all_conflicts) {
replaced.fee += txiter->GetModifiedFee();
replaced.size += txiter->GetTxSize();
}
// The total fee & size of the new diagram minus replaced fee & size should be the total
// fee & size of the old diagram minus replacement fee & size.
assert((first_sum - replaced) == (second_sum - FeeFrac{replacement_fees, replacement_vsize}));
}
// If internals report error, wrapper should too
auto err_tuple{ImprovesFeerateDiagram(pool, direct_conflicts, all_conflicts, replacement_fees, replacement_vsize)};
if (!calc_results.has_value()) {
assert(err_tuple.value().first == DiagramCheckError::UNCALCULABLE);
} else {
// Diagram check succeeded
auto old_sum = std::accumulate(calc_results->first.begin(), calc_results->first.end(), FeeFrac{});
auto new_sum = std::accumulate(calc_results->second.begin(), calc_results->second.end(), FeeFrac{});
if (!err_tuple.has_value()) {
// New diagram's final fee should always match or exceed old diagram's
assert(old_sum.fee <= new_sum.fee);
} else if (old_sum.fee > new_sum.fee) {
// Or it failed, and if old diagram had higher fees, it should be a failure
assert(err_tuple.value().first == DiagramCheckError::FAILURE);
}
}
}
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