From 95830edac76531fe20f9177eca532e9d73de5179 Mon Sep 17 00:00:00 2001 From: Antoine Riard Date: Tue, 7 Apr 2020 21:07:55 -0400 Subject: [PATCH] Add test_update_err_monitor_lockdown This test tries the new lockdown logic in case of a signed-and-broadcast local commitment transaction while a concurrent ChannelMonitorUpdate for a next _local_ commitment is submitted from offchain. Update is rejected as expected with a ChannelMonitorUpdateErr. --- lightning/src/ln/functional_tests.rs | 63 ++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs index 8f140310..1be967d9 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -4,10 +4,12 @@ use chain::transaction::OutPoint; use chain::keysinterface::{ChannelKeys, KeysInterface, SpendableOutputDescriptor}; +use chain::chaininterface; use chain::chaininterface::{ChainListener, ChainWatchInterfaceUtil, BlockNotifier}; use ln::channel::{COMMITMENT_TX_BASE_WEIGHT, COMMITMENT_TX_WEIGHT_PER_HTLC}; use ln::channelmanager::{ChannelManager,ChannelManagerReadArgs,HTLCForwardInfo,RAACommitmentOrder, PaymentPreimage, PaymentHash, PaymentSecret, PaymentSendFailure, BREAKDOWN_TIMEOUT}; use ln::channelmonitor::{ChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ManyChannelMonitor, ANTI_REORG_DELAY}; +use ln::channelmonitor; use ln::channel::{Channel, ChannelError}; use ln::{chan_utils, onion_utils}; use ln::router::{Route, RouteHop}; @@ -7581,3 +7583,64 @@ fn test_simple_mpp() { // ...but with the right secret we should be able to claim all the way back claim_payment_along_route_with_secret(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_preimage, Some(payment_secret), 200_000); } + +#[test] +fn test_update_err_monitor_lockdown() { + // Our monitor will lock update of local commitment transaction if a broadcastion condition + // has been fulfilled (either force-close from Channel or block height requiring a HTLC- + // timeout). Trying to update monitor after lockdown should return a ChannelMonitorUpdateErr. + // + // This scenario may happen in a watchtower setup, where watchtower process a block height + // triggering a timeout while a slow-block-processing ChannelManager receives a local signed + // commitment at same time. + + let chanmon_cfgs = create_chanmon_cfgs(2); + let node_cfgs = create_node_cfgs(2, &chanmon_cfgs); + let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]); + let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs); + + // Create some initial channel + let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::supported(), InitFeatures::supported()); + let outpoint = OutPoint { txid: chan_1.3.txid(), index: 0 }; + + // Rebalance the network to generate htlc in the two directions + send_payment(&nodes[0], &vec!(&nodes[1])[..], 10_000_000, 10_000_000); + + // Route a HTLC from node 0 to node 1 (but don't settle) + let preimage = route_payment(&nodes[0], &vec!(&nodes[1])[..], 9_000_000).0; + + // Copy SimpleManyChannelMonitor to simulate a watchtower and update block height of node 0 until its ChannelMonitor timeout HTLC onchain + let logger = Arc::new(test_utils::TestLogger::with_id(format!("node {}", 0))); + let watchtower = { + let monitors = nodes[0].chan_monitor.simple_monitor.monitors.lock().unwrap(); + let monitor = monitors.get(&outpoint).unwrap(); + let mut w = test_utils::TestVecWriter(Vec::new()); + monitor.write_for_disk(&mut w).unwrap(); + let new_monitor = <(Sha256dHash, channelmonitor::ChannelMonitor)>::read( + &mut ::std::io::Cursor::new(&w.0), Arc::new(test_utils::TestLogger::new())).unwrap().1; + assert!(new_monitor == *monitor); + let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, logger.clone() as Arc)); + let watchtower = test_utils::TestChannelMonitor::new(chain_monitor, &chanmon_cfgs[0].tx_broadcaster, logger.clone(), &chanmon_cfgs[0].fee_estimator); + assert!(watchtower.add_monitor(outpoint, new_monitor).is_ok()); + watchtower + }; + let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 }; + watchtower.simple_monitor.block_connected(&header, 200, &vec![], &vec![]); + + // Try to update ChannelMonitor + assert!(nodes[1].node.claim_funds(preimage, &None, 9_000_000)); + check_added_monitors!(nodes[1], 1); + let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id()); + assert_eq!(updates.update_fulfill_htlcs.len(), 1); + nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fulfill_htlcs[0]); + if let Some(ref mut channel) = nodes[0].node.channel_state.lock().unwrap().by_id.get_mut(&chan_1.2) { + if let Ok((_, _, _, update)) = channel.commitment_signed(&updates.commitment_signed, &node_cfgs[0].fee_estimator) { + if let Err(_) = watchtower.simple_monitor.update_monitor(outpoint, update.clone()) {} else { assert!(false); } + if let Ok(_) = nodes[0].chan_monitor.update_monitor(outpoint, update) {} else { assert!(false); } + } else { assert!(false); } + } else { assert!(false); }; + // Our local monitor is in-sync and hasn't processed yet timeout + check_added_monitors!(nodes[0], 1); + let events = nodes[0].node.get_and_clear_pending_events(); + assert_eq!(events.len(), 1); +} -- 2.30.2