diff options
| -rw-r--r-- | src/wallet/test/spend_tests.cpp | 45 | ||||
| -rwxr-xr-x | test/functional/rpc_fundrawtransaction.py | 45 |
2 files changed, 90 insertions, 0 deletions
diff --git a/src/wallet/test/spend_tests.cpp b/src/wallet/test/spend_tests.cpp index a75b014870..81a8883f85 100644 --- a/src/wallet/test/spend_tests.cpp +++ b/src/wallet/test/spend_tests.cpp @@ -112,5 +112,50 @@ BOOST_FIXTURE_TEST_CASE(FillInputToWeightTest, BasicTestingSetup) // Note: We don't test the next boundary because of memory allocation constraints. } +BOOST_FIXTURE_TEST_CASE(wallet_duplicated_preset_inputs_test, TestChain100Setup) +{ + // Verify that the wallet's Coin Selection process does not include pre-selected inputs twice in a transaction. + + // Add 4 spendable UTXO, 50 BTC each, to the wallet (total balance 200 BTC) + for (int i = 0; i < 4; i++) CreateAndProcessBlock({}, GetScriptForRawPubKey(coinbaseKey.GetPubKey())); + auto wallet = CreateSyncedWallet(*m_node.chain, WITH_LOCK(Assert(m_node.chainman)->GetMutex(), return m_node.chainman->ActiveChain()), m_args, coinbaseKey); + + LOCK(wallet->cs_wallet); + auto available_coins = AvailableCoins(*wallet); + std::vector<COutput> coins = available_coins.All(); + // Preselect the first 3 UTXO (150 BTC total) + std::set<COutPoint> preset_inputs = {coins[0].outpoint, coins[1].outpoint, coins[2].outpoint}; + + // Try to create a tx that spends more than what preset inputs + wallet selected inputs are covering for. + // The wallet can cover up to 200 BTC, and the tx target is 299 BTC. + std::vector<CRecipient> recipients = {{GetScriptForDestination(*Assert(wallet->GetNewDestination(OutputType::BECH32, "dummy"))), + /*nAmount=*/299 * COIN, /*fSubtractFeeFromAmount=*/true}}; + CCoinControl coin_control; + coin_control.m_allow_other_inputs = true; + for (const auto& outpoint : preset_inputs) { + coin_control.Select(outpoint); + } + + // Attempt to send 299 BTC from a wallet that only has 200 BTC. The wallet should exclude + // the preset inputs from the pool of available coins, realize that there is not enough + // money to fund the 299 BTC payment, and fail with "Insufficient funds". + // + // Even with SFFO, the wallet can only afford to send 200 BTC. + // If the wallet does not properly exclude preset inputs from the pool of available coins + // prior to coin selection, it may create a transaction that does not fund the full payment + // amount or, through SFFO, incorrectly reduce the recipient's amount by the difference + // between the original target and the wrongly counted inputs (in this case 99 BTC) + // so that the recipient's amount is no longer equal to the user's selected target of 299 BTC. + + // First case, use 'subtract_fee_from_outputs=true' + util::Result<CreatedTransactionResult> res_tx = CreateTransaction(*wallet, recipients, /*change_pos*/-1, coin_control); + BOOST_CHECK(!res_tx.has_value()); + + // Second case, don't use 'subtract_fee_from_outputs'. + recipients[0].fSubtractFeeFromAmount = false; + res_tx = CreateTransaction(*wallet, recipients, /*change_pos*/-1, coin_control); + BOOST_CHECK(!res_tx.has_value()); +} + BOOST_AUTO_TEST_SUITE_END() } // namespace wallet diff --git a/test/functional/rpc_fundrawtransaction.py b/test/functional/rpc_fundrawtransaction.py index a963bb5e2d..9a3a356097 100755 --- a/test/functional/rpc_fundrawtransaction.py +++ b/test/functional/rpc_fundrawtransaction.py @@ -107,6 +107,7 @@ class RawTransactionsTest(BitcoinTestFramework): self.generate(self.nodes[0], 121) self.test_add_inputs_default_value() + self.test_preset_inputs_selection() self.test_weight_calculation() self.test_change_position() self.test_simple() @@ -1189,6 +1190,50 @@ class RawTransactionsTest(BitcoinTestFramework): self.nodes[2].unloadwallet("test_preset_inputs") + def test_preset_inputs_selection(self): + self.log.info('Test wallet preset inputs are not double-counted or reused in coin selection') + + # Create and fund the wallet with 4 UTXO of 5 BTC each (20 BTC total) + self.nodes[2].createwallet("test_preset_inputs_selection") + wallet = self.nodes[2].get_wallet_rpc("test_preset_inputs_selection") + outputs = {} + for _ in range(4): + outputs[wallet.getnewaddress(address_type="bech32")] = 5 + self.nodes[0].sendmany("", outputs) + self.generate(self.nodes[0], 1) + + # Select the preset inputs + coins = wallet.listunspent() + preset_inputs = [coins[0], coins[1], coins[2]] + + # Now let's create the tx creation options + options = { + "inputs": preset_inputs, + "add_inputs": True, # automatically add coins from the wallet to fulfill the target + "subtract_fee_from_outputs": [0], # deduct fee from first output + "add_to_wallet": False + } + + # Attempt to send 29 BTC from a wallet that only has 20 BTC. The wallet should exclude + # the preset inputs from the pool of available coins, realize that there is not enough + # money to fund the 29 BTC payment, and fail with "Insufficient funds". + # + # Even with SFFO, the wallet can only afford to send 20 BTC. + # If the wallet does not properly exclude preset inputs from the pool of available coins + # prior to coin selection, it may create a transaction that does not fund the full payment + # amount or, through SFFO, incorrectly reduce the recipient's amount by the difference + # between the original target and the wrongly counted inputs (in this case 9 BTC) + # so that the recipient's amount is no longer equal to the user's selected target of 29 BTC. + + # First case, use 'subtract_fee_from_outputs = true' + assert_raises_rpc_error(-4, "Insufficient funds", wallet.send, outputs=[{wallet.getnewaddress(address_type="bech32"): 29}], options=options) + + # Second case, don't use 'subtract_fee_from_outputs' + del options["subtract_fee_from_outputs"] + assert_raises_rpc_error(-4, "Insufficient funds", wallet.send, outputs=[{wallet.getnewaddress(address_type="bech32"): 29}], options=options) + + self.nodes[2].unloadwallet("test_preset_inputs_selection") + def test_weight_calculation(self): self.log.info("Test weight calculation with external inputs") |