From 9f37d1898f796e9929c6c5e9f33276a4f6189672 Mon Sep 17 00:00:00 2001 From: Antoine Riard Date: Mon, 27 Sep 2021 20:14:06 -0400 Subject: [PATCH] Re-add `test_max_dust_htlc_exposure` --- lightning/src/ln/functional_tests.rs | 130 +++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs index 6fa7858f0..5a959aad0 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -9262,3 +9262,133 @@ fn test_keysend_payments_to_private_node() { pass_along_path(&nodes[0], &path, 10000, payment_hash, None, event, true, Some(test_preimage)); claim_payment(&nodes[0], &path, test_preimage); } + +fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, at_forward: bool, on_holder_tx: bool) { + // Test that we properly reject dust HTLC violating our `max_dust_htlc_exposure_msat` + // policy. + // + // At HTLC forward (`send_payment()`), if the sum of the trimmed-to-dust HTLC inbound and + // trimmed-to-dust HTLC outbound balance and this new payment as included on next + // counterparty commitment are above our `max_dust_htlc_exposure_msat`, we'll reject the + // update. At HTLC reception (`update_add_htlc()`), if the sum of the trimmed-to-dust HTLC + // inbound and trimmed-to-dust HTLC outbound balance and this new received HTLC as included + // on next counterparty commitment are above our `max_dust_htlc_exposure_msat`, we'll fail + // the update. Note, we return a `temporary_channel_failure` (0x1000 | 7), as the channel + // might be available again for HTLC processing once the dust bandwidth has cleared up. + + let chanmon_cfgs = create_chanmon_cfgs(2); + let mut config = test_default_channel_config(); + config.channel_options.max_dust_htlc_exposure_msat = 5_000_000; // default setting value + let node_cfgs = create_node_cfgs(2, &chanmon_cfgs); + let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, Some(config)]); + let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs); + + nodes[0].node.create_channel(nodes[1].node.get_our_node_id(), 1_000_000, 500_000_000, 42, None).unwrap(); + let mut open_channel = get_event_msg!(nodes[0], MessageSendEvent::SendOpenChannel, nodes[1].node.get_our_node_id()); + open_channel.max_htlc_value_in_flight_msat = 50_000_000; + open_channel.max_accepted_htlcs = 60; + nodes[1].node.handle_open_channel(&nodes[0].node.get_our_node_id(), InitFeatures::known(), &open_channel); + let mut accept_channel = get_event_msg!(nodes[1], MessageSendEvent::SendAcceptChannel, nodes[0].node.get_our_node_id()); + if on_holder_tx { + accept_channel.dust_limit_satoshis = 546; + } + nodes[0].node.handle_accept_channel(&nodes[1].node.get_our_node_id(), InitFeatures::known(), &accept_channel); + + let (temporary_channel_id, tx, _) = create_funding_transaction(&nodes[0], 1_000_000, 42); + + if on_holder_tx { + if let Some(mut chan) = nodes[1].node.channel_state.lock().unwrap().by_id.get_mut(&temporary_channel_id) { + chan.holder_dust_limit_satoshis = 546; + } + } + + nodes[0].node.funding_transaction_generated(&temporary_channel_id, tx.clone()).unwrap(); + nodes[1].node.handle_funding_created(&nodes[0].node.get_our_node_id(), &get_event_msg!(nodes[0], MessageSendEvent::SendFundingCreated, nodes[1].node.get_our_node_id())); + check_added_monitors!(nodes[1], 1); + + nodes[0].node.handle_funding_signed(&nodes[1].node.get_our_node_id(), &get_event_msg!(nodes[1], MessageSendEvent::SendFundingSigned, nodes[0].node.get_our_node_id())); + check_added_monitors!(nodes[0], 1); + + let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx); + let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked); + update_nodes_with_chan_announce(&nodes, 0, 1, &announcement, &as_update, &bs_update); + + if on_holder_tx { + if dust_outbound_balance { + // Outbound dust threshold: 2223 sats (`dust_buffer_feerate` * HTLC_TIMEOUT_TX_WEIGHT / 1000 + holder's `dust_limit_satoshis`) + // Outbound dust balance: 4372 sats + // Note, we need sent payment to be above outbound dust threshold on counterparty_tx of 2132 sats + for i in 0..2 { + let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 2_186_000); + if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); } + } + } else { + // Inbound dust threshold: 2324 sats (`dust_buffer_feerate` * HTLC_SUCCESS_TX_WEIGHT / 1000 + holder's `dust_limit_satoshis`) + // Inbound dust balance: 4372 sats + // Note, we need sent payment to be above outbound dust threshold on counterparty_tx of 2031 sats + for _ in 0..2 { + route_payment(&nodes[0], &[&nodes[1]], 2_186_000); + } + } + } else { + if dust_outbound_balance { + // Outbound dust threshold: 2132 sats (`dust_buffer_feerate` * HTLC_TIMEOUT_TX_WEIGHT / 1000 + counteparty's `dust_limit_satoshis`) + // Outbound dust balance: 5000 sats + for i in 0..25 { + let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], 200_000); + if let Err(_) = nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)) { panic!("Unexpected event at dust HTLC {}", i); } + } + } else { + // Inbound dust threshold: 2031 sats (`dust_buffer_feerate` * HTLC_TIMEOUT_TX_WEIGHT / 1000 + counteparty's `dust_limit_satoshis`) + // Inbound dust balance: 5000 sats + for _ in 0..25 { + route_payment(&nodes[0], &[&nodes[1]], 200_000); + } + } + } + + if at_forward { + let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[1], nodes[0], if on_holder_tx { 2_186_000 } else { 200_000 }); + let mut config = UserConfig::default(); + // With default dust exposure: 5000 sats + if on_holder_tx { + // Outbound dust balance: 6558 sats + unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_558_000, config.channel_options.max_dust_htlc_exposure_msat))); + } else { + // Outbound dust balance: 5200 sats + unwrap_send_err!(nodes[1].node.send_payment(&route, payment_hash, &Some(payment_secret)), true, APIError::ChannelUnavailable { ref err }, assert_eq!(err, &format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat))); + } + } else { + let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1 ], if on_holder_tx { 2_186_000 } else { 200_000 }); + nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap(); + check_added_monitors!(nodes[0], 1); + let mut events = nodes[0].node.get_and_clear_pending_msg_events(); + assert_eq!(events.len(), 1); + let payment_event = SendEvent::from_event(events.remove(0)); + nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]); + // With default dust exposure: 5000 sats + if on_holder_tx { + // Outbound dust balance: 6558 sats + nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx", 6_558_000, config.channel_options.max_dust_htlc_exposure_msat), 1); + } else { + // Outbound dust balance: 5200 sats + nodes[1].logger.assert_log("lightning::ln::channel".to_string(), format!("Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx", 5_200_000, config.channel_options.max_dust_htlc_exposure_msat), 1); + } + } + + let _ = nodes[1].node.get_and_clear_pending_msg_events(); + let mut added_monitors = nodes[1].chain_monitor.added_monitors.lock().unwrap(); + added_monitors.clear(); +} + +#[test] +fn test_max_dust_htlc_exposure() { + do_test_max_dust_htlc_exposure(true, true, true); + do_test_max_dust_htlc_exposure(false, true, true); + do_test_max_dust_htlc_exposure(false, false, true); + do_test_max_dust_htlc_exposure(false, false, false); + do_test_max_dust_htlc_exposure(true, true, false); + do_test_max_dust_htlc_exposure(true, false, false); + do_test_max_dust_htlc_exposure(true, false, true); + do_test_max_dust_htlc_exposure(false, true, false); +} -- 2.39.5