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// Copyright (c) 2021 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 <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <test/util/setup_common.h>
#include <util/translation.h>
#include <wallet/context.h>
#include <wallet/receive.h>
#include <wallet/wallet.h>
#include <wallet/walletdb.h>
#include <wallet/walletutil.h>
#include <cassert>
#include <cstdint>
#include <string>
#include <vector>
namespace {
const TestingSetup* g_setup;
void initialize_setup()
{
static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();
g_setup = testing_setup.get();
}
/**
* Wraps a descriptor wallet for fuzzing. The constructor writes the sqlite db
* to disk, the destructor deletes it.
*/
struct FuzzedWallet {
ArgsManager args;
WalletContext context;
std::shared_ptr<CWallet> wallet;
FuzzedWallet(const std::string& name)
{
context.args = &args;
context.chain = g_setup->m_node.chain.get();
DatabaseOptions options;
options.require_create = true;
options.create_flags = WALLET_FLAG_DESCRIPTORS;
const std::optional<bool> load_on_start;
gArgs.ForceSetArg("-keypool", "0"); // Avoid timeout in TopUp()
DatabaseStatus status;
bilingual_str error;
std::vector<bilingual_str> warnings;
wallet = CreateWallet(context, name, load_on_start, options, status, error, warnings);
assert(wallet);
assert(error.empty());
assert(warnings.empty());
assert(wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
}
~FuzzedWallet()
{
const auto name{wallet->GetName()};
std::vector<bilingual_str> warnings;
std::optional<bool> load_on_start;
assert(RemoveWallet(context, wallet, load_on_start, warnings));
assert(warnings.empty());
UnloadWallet(std::move(wallet));
fs::remove_all(GetWalletDir() / name);
}
CScript GetScriptPubKey(FuzzedDataProvider& fuzzed_data_provider)
{
auto type{fuzzed_data_provider.PickValueInArray(OUTPUT_TYPES)};
if (type == OutputType::BECH32M) {
type = OutputType::BECH32; // TODO: Setup taproot descriptor and remove this line
}
CTxDestination dest;
bilingual_str error;
if (fuzzed_data_provider.ConsumeBool()) {
assert(wallet->GetNewDestination(type, "", dest, error));
} else {
assert(wallet->GetNewChangeDestination(type, dest, error));
}
assert(error.empty());
return GetScriptForDestination(dest);
}
};
FUZZ_TARGET_INIT(wallet_notifications, initialize_setup)
{
FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
// The total amount, to be distributed to the wallets a and b in txs
// without fee. Thus, the balance of the wallets should always equal the
// total amount.
const auto total_amount{ConsumeMoney(fuzzed_data_provider)};
FuzzedWallet a{"fuzzed_wallet_a"};
FuzzedWallet b{"fuzzed_wallet_b"};
// Keep track of all coins in this test.
// Each tuple in the chain represents the coins and the block created with
// those coins. Once the block is mined, the next tuple will have an empty
// block and the freshly mined coins.
using Coins = std::set<std::tuple<CAmount, COutPoint>>;
std::vector<std::tuple<Coins, CBlock>> chain;
{
// Add the initial entry
chain.emplace_back();
auto& [coins, block]{chain.back()};
coins.emplace(total_amount, COutPoint{uint256::ONE, 1});
}
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 200)
{
CallOneOf(
fuzzed_data_provider,
[&] {
auto& [coins_orig, block]{chain.back()};
// Copy the coins for this block and consume all of them
Coins coins = coins_orig;
while (!coins.empty()) {
// Create a new tx
CMutableTransaction tx{};
// Add some coins as inputs to it
auto num_inputs{fuzzed_data_provider.ConsumeIntegralInRange<int>(1, coins.size())};
CAmount in{0};
while (num_inputs-- > 0) {
const auto& [coin_amt, coin_outpoint]{*coins.begin()};
in += coin_amt;
tx.vin.emplace_back(coin_outpoint);
coins.erase(coins.begin());
}
// Create some outputs spending all inputs, without fee
LIMITED_WHILE(in > 0 && fuzzed_data_provider.ConsumeBool(), 100)
{
const auto out_value{ConsumeMoney(fuzzed_data_provider, in)};
in -= out_value;
auto& wallet{fuzzed_data_provider.ConsumeBool() ? a : b};
tx.vout.emplace_back(out_value, wallet.GetScriptPubKey(fuzzed_data_provider));
}
// Spend the remaining input value, if any
auto& wallet{fuzzed_data_provider.ConsumeBool() ? a : b};
tx.vout.emplace_back(in, wallet.GetScriptPubKey(fuzzed_data_provider));
// Add tx to block
block.vtx.emplace_back(MakeTransactionRef(tx));
}
// Mine block
a.wallet->blockConnected(block, chain.size());
b.wallet->blockConnected(block, chain.size());
// Store the coins for the next block
Coins coins_new;
for (const auto& tx : block.vtx) {
uint32_t i{0};
for (const auto& out : tx->vout) {
coins_new.emplace(out.nValue, COutPoint{tx->GetHash(), i++});
}
}
chain.emplace_back(coins_new, CBlock{});
},
[&] {
if (chain.size() <= 1) return; // The first entry can't be removed
auto& [coins, block]{chain.back()};
if (block.vtx.empty()) return; // Can only disconnect if the block was submitted first
// Disconnect block
a.wallet->blockDisconnected(block, chain.size() - 1);
b.wallet->blockDisconnected(block, chain.size() - 1);
chain.pop_back();
});
auto& [coins, first_block]{chain.front()};
if (!first_block.vtx.empty()) {
// Only check balance when at least one block was submitted
const auto bal_a{GetBalance(*a.wallet).m_mine_trusted};
const auto bal_b{GetBalance(*b.wallet).m_mine_trusted};
assert(total_amount == bal_a + bal_b);
}
}
}
} // namespace
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