1 use bitcoin::blockdata::block::BlockHeader;
2 use bitcoin::blockdata::script::{Script,Builder};
3 use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
4 use bitcoin::blockdata::opcodes;
5 use bitcoin::util::hash::{BitcoinHash, Sha256dHash, Hash160};
6 use bitcoin::util::bip143;
7 use bitcoin::consensus::encode::{self, Encodable, Decodable};
9 use secp256k1::key::{PublicKey,SecretKey};
10 use secp256k1::{Secp256k1,Message,Signature};
13 use crypto::digest::Digest;
16 use ln::msgs::DecodeError;
17 use ln::channelmonitor::ChannelMonitor;
18 use ln::channelmanager::{PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingForwardHTLCInfo, RAACommitmentOrder};
19 use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
21 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
22 use chain::transaction::OutPoint;
23 use chain::keysinterface::{ChannelKeys, KeysInterface};
24 use util::{transaction_utils,rng};
25 use util::ser::{Readable, ReadableArgs, Writeable, Writer, WriterWriteAdaptor};
26 use util::sha2::Sha256;
27 use util::logger::Logger;
28 use util::errors::APIError;
29 use util::config::{UserConfig,ChannelConfig};
32 use std::default::Default;
34 use std::time::Instant;
38 pub struct ChannelValueStat {
39 pub value_to_self_msat: u64,
40 pub channel_value_msat: u64,
41 pub channel_reserve_msat: u64,
42 pub pending_outbound_htlcs_amount_msat: u64,
43 pub pending_inbound_htlcs_amount_msat: u64,
44 pub holding_cell_outbound_amount_msat: u64,
45 pub their_max_htlc_value_in_flight_msat: u64, // outgoing
48 enum InboundHTLCRemovalReason {
49 FailRelay(msgs::OnionErrorPacket),
50 FailMalformed(([u8; 32], u16)),
54 enum InboundHTLCState {
55 /// Added by remote, to be included in next local commitment tx.
56 RemoteAnnounced(PendingHTLCStatus),
57 /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
58 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
59 /// accept this HTLC. Implies AwaitingRemoteRevoke.
60 /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
61 /// a remote revoke_and_ack on a previous state before we can do so.
62 AwaitingRemoteRevokeToAnnounce(PendingHTLCStatus),
63 /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
64 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
65 /// accept this HTLC. Implies AwaitingRemoteRevoke.
66 /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
68 AwaitingAnnouncedRemoteRevoke(PendingHTLCStatus),
70 /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
71 /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
73 /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
74 /// commitment transaction without it as otherwise we'll have to force-close the channel to
75 /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
76 /// anyway). That said, ChannelMonitor does this for us (see
77 /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
78 /// local state before then, once we're sure that the next commitment_signed and
79 /// ChannelMonitor::provide_latest_local_commitment_tx_info will not include this HTLC.
80 LocalRemoved(InboundHTLCRemovalReason),
83 struct InboundHTLCOutput {
87 payment_hash: [u8; 32],
88 state: InboundHTLCState,
91 enum OutboundHTLCState {
92 /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
93 /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
94 /// we will promote to Committed (note that they may not accept it until the next time we
95 /// revoke, but we dont really care about that:
96 /// * they've revoked, so worst case we can announce an old state and get our (option on)
97 /// money back (though we wont), and,
98 /// * we'll send them a revoke when they send a commitment_signed, and since only they're
99 /// allowed to remove it, the "can only be removed once committed on both sides" requirement
100 /// doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
101 /// we'll never get out of sync).
102 /// Note that we Box the OnionPacket as its rather large and we don't want to blow up
103 /// OutboundHTLCOutput's size just for a temporary bit
104 LocalAnnounced(Box<msgs::OnionPacket>),
106 /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
107 /// the change (though they'll need to revoke before we fail the payment).
109 /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
110 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
111 /// can do any backwards failing. Implies AwaitingRemoteRevoke.
112 /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
113 /// remote revoke_and_ack on a previous state before we can do so.
114 AwaitingRemoteRevokeToRemove,
115 /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
116 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
117 /// can do any backwards failing. Implies AwaitingRemoteRevoke.
118 /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
119 /// revoke_and_ack to drop completely.
120 AwaitingRemovedRemoteRevoke,
123 struct OutboundHTLCOutput {
127 payment_hash: [u8; 32],
128 state: OutboundHTLCState,
130 /// If we're in a removed state, set if they failed, otherwise None
131 fail_reason: Option<HTLCFailReason>,
134 macro_rules! get_htlc_in_commitment {
135 ($htlc: expr, $offered: expr) => {
136 HTLCOutputInCommitment {
138 amount_msat: $htlc.amount_msat,
139 cltv_expiry: $htlc.cltv_expiry,
140 payment_hash: $htlc.payment_hash,
141 transaction_output_index: 0
146 /// See AwaitingRemoteRevoke ChannelState for more info
147 enum HTLCUpdateAwaitingACK {
152 payment_hash: [u8; 32],
154 onion_routing_packet: msgs::OnionPacket,
155 time_created: Instant, //TODO: Some kind of timeout thing-a-majig
158 payment_preimage: [u8; 32],
163 err_packet: msgs::OnionErrorPacket,
167 /// There are a few "states" and then a number of flags which can be applied:
168 /// We first move through init with OurInitSent -> TheirInitSent -> FundingCreated -> FundingSent.
169 /// TheirFundingLocked and OurFundingLocked then get set on FundingSent, and when both are set we
170 /// move on to ChannelFunded.
171 /// Note that PeerDisconnected can be set on both ChannelFunded and FundingSent.
172 /// ChannelFunded can then get all remaining flags set on it, until we finish shutdown, then we
173 /// move on to ShutdownComplete, at which point most calls into this channel are disallowed.
175 /// Implies we have (or are prepared to) send our open_channel/accept_channel message
176 OurInitSent = (1 << 0),
177 /// Implies we have received their open_channel/accept_channel message
178 TheirInitSent = (1 << 1),
179 /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
180 /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
181 /// upon receipt of funding_created, so simply skip this state.
183 /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
184 /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
185 /// and our counterparty consider the funding transaction confirmed.
187 /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
188 /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
189 TheirFundingLocked = (1 << 4),
190 /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
191 /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
192 OurFundingLocked = (1 << 5),
194 /// Flag which is set on ChannelFunded and FundingSent indicating remote side is considered
195 /// "disconnected" and no updates are allowed until after we've done a channel_reestablish
197 PeerDisconnected = (1 << 7),
198 /// Flag which is set on ChannelFunded and FundingSent indicating the user has told us they
199 /// failed to update our ChannelMonitor somewhere and we should pause sending any outbound
200 /// messages until they've managed to do so.
201 MonitorUpdateFailed = (1 << 8),
202 /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
203 /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
204 /// messages as then we will be unable to determine which HTLCs they included in their
205 /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
207 /// Flag is set on ChannelFunded.
208 AwaitingRemoteRevoke = (1 << 9),
209 /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
210 /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
211 /// to respond with our own shutdown message when possible.
212 RemoteShutdownSent = (1 << 10),
213 /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
214 /// point, we may not add any new HTLCs to the channel.
215 /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
216 /// us their shutdown.
217 LocalShutdownSent = (1 << 11),
218 /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
219 /// to drop us, but we store this anyway.
220 ShutdownComplete = 4096,
222 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
223 const MULTI_STATE_FLAGS: u32 = (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32);
225 const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
227 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
228 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
229 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
231 pub(super) struct Channel {
232 config: ChannelConfig,
236 channel_id: [u8; 32],
238 channel_outbound: bool,
239 secp_ctx: Secp256k1<secp256k1::All>,
240 channel_value_satoshis: u64,
242 local_keys: ChannelKeys,
243 shutdown_pubkey: PublicKey,
245 // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
246 // generation start at 0 and count up...this simplifies some parts of implementation at the
247 // cost of others, but should really just be changed.
249 cur_local_commitment_transaction_number: u64,
250 cur_remote_commitment_transaction_number: u64,
251 value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
252 /// Upon receipt of a channel_reestablish we have to figure out whether to send a
253 /// revoke_and_ack first or a commitment update first. Generally, we prefer to send
254 /// revoke_and_ack first, but if we had a pending commitment update of our own waiting on a
255 /// remote revoke when we received the latest commitment update from the remote we have to make
256 /// sure that commitment update gets resent first.
257 received_commitment_while_awaiting_raa: bool,
258 pending_inbound_htlcs: Vec<InboundHTLCOutput>,
259 pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
260 holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
262 monitor_pending_revoke_and_ack: bool,
263 monitor_pending_commitment_signed: bool,
264 monitor_pending_order: Option<RAACommitmentOrder>,
265 monitor_pending_forwards: Vec<(PendingForwardHTLCInfo, u64)>,
266 monitor_pending_failures: Vec<(HTLCSource, [u8; 32], HTLCFailReason)>,
268 // pending_update_fee is filled when sending and receiving update_fee
269 // For outbound channel, feerate_per_kw is updated with the value from
270 // pending_update_fee when revoke_and_ack is received
272 // For inbound channel, feerate_per_kw is updated when it receives
273 // commitment_signed and revoke_and_ack is generated
274 // The pending value is kept when another pair of update_fee and commitment_signed
275 // is received during AwaitingRemoteRevoke and relieved when the expected
276 // revoke_and_ack is received and new commitment_signed is generated to be
277 // sent to the funder. Otherwise, the pending value is removed when receiving
278 // commitment_signed.
279 pending_update_fee: Option<u64>,
280 // update_fee() during ChannelState::AwaitingRemoteRevoke is hold in
281 // holdina_cell_update_fee then moved to pending_udpate_fee when revoke_and_ack
282 // is received. holding_cell_update_fee is updated when there are additional
283 // update_fee() during ChannelState::AwaitingRemoteRevoke.
284 holding_cell_update_fee: Option<u64>,
285 next_local_htlc_id: u64,
286 next_remote_htlc_id: u64,
287 channel_update_count: u32,
290 #[cfg(debug_assertions)]
291 /// Max to_local and to_remote outputs in a locally-generated commitment transaction
292 max_commitment_tx_output_local: ::std::sync::Mutex<(u64, u64)>,
293 #[cfg(debug_assertions)]
294 /// Max to_local and to_remote outputs in a remote-generated commitment transaction
295 max_commitment_tx_output_remote: ::std::sync::Mutex<(u64, u64)>,
298 // Used in ChannelManager's tests to send a revoked transaction
299 pub last_local_commitment_txn: Vec<Transaction>,
301 last_local_commitment_txn: Vec<Transaction>,
303 last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
305 /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
306 /// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
307 /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
308 /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
309 funding_tx_confirmed_in: Option<Sha256dHash>,
310 short_channel_id: Option<u64>,
311 /// Used to deduplicate block_connected callbacks, also used to verify consistency during
312 /// ChannelManager deserialization (hence pub(super))
313 pub(super) last_block_connected: Sha256dHash,
314 funding_tx_confirmations: u64,
316 their_dust_limit_satoshis: u64,
317 our_dust_limit_satoshis: u64,
318 their_max_htlc_value_in_flight_msat: u64,
319 //get_our_max_htlc_value_in_flight_msat(): u64,
320 /// minimum channel reserve for **self** to maintain - set by them.
321 their_channel_reserve_satoshis: u64,
322 //get_our_channel_reserve_satoshis(): u64,
323 their_htlc_minimum_msat: u64,
324 our_htlc_minimum_msat: u64,
325 their_to_self_delay: u16,
326 //implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
327 their_max_accepted_htlcs: u16,
328 //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
331 their_funding_pubkey: Option<PublicKey>,
332 their_revocation_basepoint: Option<PublicKey>,
333 their_payment_basepoint: Option<PublicKey>,
334 their_delayed_payment_basepoint: Option<PublicKey>,
335 their_htlc_basepoint: Option<PublicKey>,
336 their_cur_commitment_point: Option<PublicKey>,
338 their_prev_commitment_point: Option<PublicKey>,
339 their_node_id: PublicKey,
341 their_shutdown_scriptpubkey: Option<Script>,
343 channel_monitor: ChannelMonitor,
348 const OUR_MAX_HTLCS: u16 = 5; //TODO
349 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
350 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
351 /// really allow for this, so instead we're stuck closing it out at that point.
352 const UNCONF_THRESHOLD: u32 = 6;
353 /// The amount of time we require our counterparty wait to claim their money (ie time between when
354 /// we, or our watchtower, must check for them having broadcast a theft transaction).
355 const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
356 /// The amount of time we're willing to wait to claim money back to us
357 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
358 /// Exposing these two constants for use in test in ChannelMonitor
359 pub const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
360 pub const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
361 const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
362 const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
363 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
365 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
367 /// Used to return a simple Error back to ChannelManager. Will get converted to a
368 /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our
369 /// channel_id in ChannelManager.
371 pub(super) enum ChannelError {
372 Ignore(&'static str),
376 macro_rules! secp_check {
377 ($res: expr, $err: expr) => {
380 Err(_) => return Err(ChannelError::Close($err)),
386 // Convert constants + channel value to limits:
387 fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
388 channel_value_satoshis * 1000 / 10 //TODO
391 /// Returns a minimum channel reserve value **they** need to maintain
393 /// Guaranteed to return a value no larger than channel_value_satoshis
394 fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
395 let (q, _) = channel_value_satoshis.overflowing_div(100);
396 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
399 fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
400 cmp::max(at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000, 546) //TODO
403 fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
407 fn derive_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
408 // Note that in order to comply with BOLT 7 announcement_signatures requirements this must
410 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
415 pub fn new_outbound(fee_estimator: &FeeEstimator, keys_provider: &Arc<KeysInterface>, their_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, logger: Arc<Logger>, config: &UserConfig) -> Result<Channel, APIError> {
416 let chan_keys = keys_provider.get_channel_keys(false);
418 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
419 return Err(APIError::APIMisuseError{err: "funding value > 2^24"});
422 if push_msat > channel_value_satoshis * 1000 {
423 return Err(APIError::APIMisuseError{err: "push value > channel value"});
427 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
428 if Channel::get_our_channel_reserve_satoshis(channel_value_satoshis) < Channel::derive_our_dust_limit_satoshis(background_feerate) {
429 return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
432 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
434 let secp_ctx = Secp256k1::new();
435 let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key, &chan_keys.delayed_payment_base_key,
436 &chan_keys.htlc_base_key, &chan_keys.payment_base_key, &keys_provider.get_shutdown_pubkey(), BREAKDOWN_TIMEOUT,
437 keys_provider.get_destination_script(), logger.clone());
441 config: config.channel_options.clone(),
443 channel_id: rng::rand_u832(),
444 channel_state: ChannelState::OurInitSent as u32,
445 channel_outbound: true,
447 channel_value_satoshis: channel_value_satoshis,
449 local_keys: chan_keys,
450 shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
451 cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
452 cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
453 value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
454 received_commitment_while_awaiting_raa: false,
456 pending_inbound_htlcs: Vec::new(),
457 pending_outbound_htlcs: Vec::new(),
458 holding_cell_htlc_updates: Vec::new(),
459 pending_update_fee: None,
460 holding_cell_update_fee: None,
461 next_local_htlc_id: 0,
462 next_remote_htlc_id: 0,
463 channel_update_count: 1,
465 monitor_pending_revoke_and_ack: false,
466 monitor_pending_commitment_signed: false,
467 monitor_pending_order: None,
468 monitor_pending_forwards: Vec::new(),
469 monitor_pending_failures: Vec::new(),
471 #[cfg(debug_assertions)]
472 max_commitment_tx_output_local: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
473 #[cfg(debug_assertions)]
474 max_commitment_tx_output_remote: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
476 last_local_commitment_txn: Vec::new(),
478 last_sent_closing_fee: None,
480 funding_tx_confirmed_in: None,
481 short_channel_id: None,
482 last_block_connected: Default::default(),
483 funding_tx_confirmations: 0,
485 feerate_per_kw: feerate,
486 their_dust_limit_satoshis: 0,
487 our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
488 their_max_htlc_value_in_flight_msat: 0,
489 their_channel_reserve_satoshis: 0,
490 their_htlc_minimum_msat: 0,
491 our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate),
492 their_to_self_delay: 0,
493 their_max_accepted_htlcs: 0,
494 minimum_depth: 0, // Filled in in accept_channel
496 their_funding_pubkey: None,
497 their_revocation_basepoint: None,
498 their_payment_basepoint: None,
499 their_delayed_payment_basepoint: None,
500 their_htlc_basepoint: None,
501 their_cur_commitment_point: None,
503 their_prev_commitment_point: None,
504 their_node_id: their_node_id,
506 their_shutdown_scriptpubkey: None,
508 channel_monitor: channel_monitor,
514 fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), ChannelError> {
515 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) {
516 return Err(ChannelError::Close("Peer's feerate much too low"));
518 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) * 2 {
519 return Err(ChannelError::Close("Peer's feerate much too high"));
524 /// Creates a new channel from a remote sides' request for one.
525 /// Assumes chain_hash has already been checked and corresponds with what we expect!
526 pub fn new_from_req(fee_estimator: &FeeEstimator, keys_provider: &Arc<KeysInterface>, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, logger: Arc<Logger>, config: &UserConfig) -> Result<Channel, ChannelError> {
527 let chan_keys = keys_provider.get_channel_keys(true);
528 let mut local_config = (*config).channel_options.clone();
530 // Check sanity of message fields:
531 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
532 return Err(ChannelError::Close("funding value > 2^24"));
534 if msg.channel_reserve_satoshis > msg.funding_satoshis {
535 return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
537 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
538 return Err(ChannelError::Close("push_msat larger than funding value"));
540 if msg.dust_limit_satoshis > msg.funding_satoshis {
541 return Err(ChannelError::Close("Peer never wants payout outputs?"));
543 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
544 return Err(ChannelError::Close("Bogus; channel reserve is less than dust limit"));
546 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
547 return Err(ChannelError::Close("Miminum htlc value is full channel value"));
549 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
551 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
552 return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
554 if msg.max_accepted_htlcs < 1 {
555 return Err(ChannelError::Close("0 max_accpted_htlcs makes for a useless channel"));
557 if msg.max_accepted_htlcs > 483 {
558 return Err(ChannelError::Close("max_accpted_htlcs > 483"));
561 // Now check against optional parameters as set by config...
562 if msg.funding_satoshis < config.channel_limits.min_funding_satoshis {
563 return Err(ChannelError::Close("funding satoshis is less than the user specified limit"));
565 if msg.htlc_minimum_msat > config.channel_limits.max_htlc_minimum_msat {
566 return Err(ChannelError::Close("htlc minimum msat is higher than the user specified limit"));
568 if msg.max_htlc_value_in_flight_msat < config.channel_limits.min_max_htlc_value_in_flight_msat {
569 return Err(ChannelError::Close("max htlc value in flight msat is less than the user specified limit"));
571 if msg.channel_reserve_satoshis > config.channel_limits.max_channel_reserve_satoshis {
572 return Err(ChannelError::Close("channel reserve satoshis is higher than the user specified limit"));
574 if msg.max_accepted_htlcs < config.channel_limits.min_max_accepted_htlcs {
575 return Err(ChannelError::Close("max accepted htlcs is less than the user specified limit"));
577 if msg.dust_limit_satoshis < config.channel_limits.min_dust_limit_satoshis {
578 return Err(ChannelError::Close("dust limit satoshis is less than the user specified limit"));
580 if msg.dust_limit_satoshis > config.channel_limits.max_dust_limit_satoshis {
581 return Err(ChannelError::Close("dust limit satoshis is greater than the user specified limit"));
584 // Convert things into internal flags and prep our state:
586 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
587 if config.channel_limits.force_announced_channel_preference {
588 if local_config.announced_channel != their_announce {
589 return Err(ChannelError::Close("Peer tried to open channel but their announcement preference is different from ours"));
592 // we either accept their preference or the preferences match
593 local_config.announced_channel = their_announce;
595 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
597 let our_dust_limit_satoshis = Channel::derive_our_dust_limit_satoshis(background_feerate);
598 let our_channel_reserve_satoshis = Channel::get_our_channel_reserve_satoshis(msg.funding_satoshis);
599 if our_channel_reserve_satoshis < our_dust_limit_satoshis {
600 return Err(ChannelError::Close("Suitable channel reserve not found. aborting"));
602 if msg.channel_reserve_satoshis < our_dust_limit_satoshis {
603 return Err(ChannelError::Close("channel_reserve_satoshis too small"));
605 if our_channel_reserve_satoshis < msg.dust_limit_satoshis {
606 return Err(ChannelError::Close("Dust limit too high for our channel reserve"));
609 // check if the funder's amount for the initial commitment tx is sufficient
610 // for full fee payment
611 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
612 if funders_amount_msat < background_feerate * COMMITMENT_TX_BASE_WEIGHT {
613 return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
616 let to_local_msat = msg.push_msat;
617 let to_remote_msat = funders_amount_msat - background_feerate * COMMITMENT_TX_BASE_WEIGHT;
618 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= our_channel_reserve_satoshis * 1000 {
619 return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
622 let secp_ctx = Secp256k1::new();
623 let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key, &chan_keys.delayed_payment_base_key,
624 &chan_keys.htlc_base_key, &chan_keys.payment_base_key, &keys_provider.get_shutdown_pubkey(), BREAKDOWN_TIMEOUT,
625 keys_provider.get_destination_script(), logger.clone());
626 channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
627 channel_monitor.set_their_to_self_delay(msg.to_self_delay);
629 let mut chan = Channel {
631 config: local_config,
633 channel_id: msg.temporary_channel_id,
634 channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
635 channel_outbound: false,
638 local_keys: chan_keys,
639 shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
640 cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
641 cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
642 value_to_self_msat: msg.push_msat,
643 received_commitment_while_awaiting_raa: false,
645 pending_inbound_htlcs: Vec::new(),
646 pending_outbound_htlcs: Vec::new(),
647 holding_cell_htlc_updates: Vec::new(),
648 pending_update_fee: None,
649 holding_cell_update_fee: None,
650 next_local_htlc_id: 0,
651 next_remote_htlc_id: 0,
652 channel_update_count: 1,
654 monitor_pending_revoke_and_ack: false,
655 monitor_pending_commitment_signed: false,
656 monitor_pending_order: None,
657 monitor_pending_forwards: Vec::new(),
658 monitor_pending_failures: Vec::new(),
660 #[cfg(debug_assertions)]
661 max_commitment_tx_output_local: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
662 #[cfg(debug_assertions)]
663 max_commitment_tx_output_remote: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
665 last_local_commitment_txn: Vec::new(),
667 last_sent_closing_fee: None,
669 funding_tx_confirmed_in: None,
670 short_channel_id: None,
671 last_block_connected: Default::default(),
672 funding_tx_confirmations: 0,
674 feerate_per_kw: msg.feerate_per_kw as u64,
675 channel_value_satoshis: msg.funding_satoshis,
676 their_dust_limit_satoshis: msg.dust_limit_satoshis,
677 our_dust_limit_satoshis: our_dust_limit_satoshis,
678 their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
679 their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
680 their_htlc_minimum_msat: msg.htlc_minimum_msat,
681 our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
682 their_to_self_delay: msg.to_self_delay,
683 their_max_accepted_htlcs: msg.max_accepted_htlcs,
684 minimum_depth: Channel::derive_minimum_depth(msg.funding_satoshis*1000, msg.push_msat),
686 their_funding_pubkey: Some(msg.funding_pubkey),
687 their_revocation_basepoint: Some(msg.revocation_basepoint),
688 their_payment_basepoint: Some(msg.payment_basepoint),
689 their_delayed_payment_basepoint: Some(msg.delayed_payment_basepoint),
690 their_htlc_basepoint: Some(msg.htlc_basepoint),
691 their_cur_commitment_point: Some(msg.first_per_commitment_point),
693 their_prev_commitment_point: None,
694 their_node_id: their_node_id,
696 their_shutdown_scriptpubkey: None,
698 channel_monitor: channel_monitor,
703 let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
704 chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
709 // Utilities to derive keys:
711 fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
712 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
713 SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
716 // Utilities to build transactions:
718 fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
719 let mut sha = Sha256::new();
720 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
722 if self.channel_outbound {
723 sha.input(&our_payment_basepoint.serialize());
724 sha.input(&self.their_payment_basepoint.unwrap().serialize());
726 sha.input(&self.their_payment_basepoint.unwrap().serialize());
727 sha.input(&our_payment_basepoint.serialize());
729 let mut res = [0; 32];
730 sha.result(&mut res);
732 ((res[26] as u64) << 5*8) |
733 ((res[27] as u64) << 4*8) |
734 ((res[28] as u64) << 3*8) |
735 ((res[29] as u64) << 2*8) |
736 ((res[30] as u64) << 1*8) |
737 ((res[31] as u64) << 0*8)
740 /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
741 /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
742 /// the transaction. Thus, b will generally be sending a signature over such a transaction to
743 /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
744 /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
746 /// @local is used only to convert relevant internal structures which refer to remote vs local
747 /// to decide value of outputs and direction of HTLCs.
748 /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
749 /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
750 /// have not yet committed it. Such HTLCs will only be included in transactions which are being
751 /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
752 /// which peer generated this transaction and "to whom" this transaction flows.
754 fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, feerate_per_kw: u64) -> (Transaction, Vec<HTLCOutputInCommitment>) {
755 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (INITIAL_COMMITMENT_NUMBER - commitment_number);
758 let mut ins: Vec<TxIn> = Vec::new();
760 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
761 script_sig: Script::new(),
762 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
768 let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len() + 2);
770 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
771 let mut remote_htlc_total_msat = 0;
772 let mut local_htlc_total_msat = 0;
773 let mut value_to_self_msat_offset = 0;
775 macro_rules! add_htlc_output {
776 ($htlc: expr, $outbound: expr) => {
777 if $outbound == local { // "offered HTLC output"
778 if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
779 let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
781 script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
782 value: $htlc.amount_msat / 1000
783 }, Some(htlc_in_tx)));
786 if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
787 let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
788 txouts.push((TxOut { // "received HTLC output"
789 script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
790 value: $htlc.amount_msat / 1000
791 }, Some(htlc_in_tx)));
797 for ref htlc in self.pending_inbound_htlcs.iter() {
798 let include = match htlc.state {
799 InboundHTLCState::RemoteAnnounced(_) => !generated_by_local,
800 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) => !generated_by_local,
801 InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => true,
802 InboundHTLCState::Committed => true,
803 InboundHTLCState::LocalRemoved(_) => !generated_by_local,
807 add_htlc_output!(htlc, false);
808 remote_htlc_total_msat += htlc.amount_msat;
811 &InboundHTLCState::LocalRemoved(ref reason) => {
812 if generated_by_local {
813 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
814 value_to_self_msat_offset += htlc.amount_msat as i64;
823 for ref htlc in self.pending_outbound_htlcs.iter() {
824 let include = match htlc.state {
825 OutboundHTLCState::LocalAnnounced(_) => generated_by_local,
826 OutboundHTLCState::Committed => true,
827 OutboundHTLCState::RemoteRemoved => generated_by_local,
828 OutboundHTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
829 OutboundHTLCState::AwaitingRemovedRemoteRevoke => false,
833 add_htlc_output!(htlc, true);
834 local_htlc_total_msat += htlc.amount_msat;
837 OutboundHTLCState::AwaitingRemoteRevokeToRemove|OutboundHTLCState::AwaitingRemovedRemoteRevoke => {
838 if htlc.fail_reason.is_none() {
839 value_to_self_msat_offset -= htlc.amount_msat as i64;
842 OutboundHTLCState::RemoteRemoved => {
843 if !generated_by_local && htlc.fail_reason.is_none() {
844 value_to_self_msat_offset -= htlc.amount_msat as i64;
853 let value_to_self_msat: i64 = (self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset;
854 let value_to_remote_msat: i64 = (self.channel_value_satoshis * 1000 - self.value_to_self_msat - remote_htlc_total_msat) as i64 - value_to_self_msat_offset;
856 #[cfg(debug_assertions)]
858 // Make sure that the to_self/to_remote is always either past the appropriate
859 // channel_reserve *or* it is making progress towards it.
860 // TODO: This should happen after fee calculation, but we don't handle that correctly
862 let mut max_commitment_tx_output = if generated_by_local {
863 self.max_commitment_tx_output_local.lock().unwrap()
865 self.max_commitment_tx_output_remote.lock().unwrap()
867 debug_assert!(max_commitment_tx_output.0 <= value_to_self_msat as u64 || value_to_self_msat / 1000 >= self.their_channel_reserve_satoshis as i64);
868 max_commitment_tx_output.0 = cmp::max(max_commitment_tx_output.0, value_to_self_msat as u64);
869 debug_assert!(max_commitment_tx_output.1 <= value_to_remote_msat as u64 || value_to_remote_msat / 1000 >= Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) as i64);
870 max_commitment_tx_output.1 = cmp::max(max_commitment_tx_output.1, value_to_remote_msat as u64);
873 let total_fee: u64 = feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
874 let (value_to_self, value_to_remote) = if self.channel_outbound {
875 (value_to_self_msat / 1000 - total_fee as i64, value_to_remote_msat / 1000)
877 (value_to_self_msat / 1000, value_to_remote_msat / 1000 - total_fee as i64)
880 let value_to_a = if local { value_to_self } else { value_to_remote };
881 let value_to_b = if local { value_to_remote } else { value_to_self };
883 if value_to_a >= (dust_limit_satoshis as i64) {
885 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
886 if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
887 &keys.a_delayed_payment_key).to_v0_p2wsh(),
888 value: value_to_a as u64
892 if value_to_b >= (dust_limit_satoshis as i64) {
894 script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
895 .push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
897 value: value_to_b as u64
901 transaction_utils::sort_outputs(&mut txouts);
903 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
904 let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
905 for (idx, out) in txouts.drain(..).enumerate() {
907 if let Some(out_htlc) = out.1 {
908 htlcs_used.push(out_htlc);
909 htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
915 lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
922 fn get_closing_scriptpubkey(&self) -> Script {
923 let our_channel_close_key_hash = Hash160::from_data(&self.shutdown_pubkey.serialize());
924 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
928 fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
929 (4 + 1 + 36 + 4 + 1 + 1 + 2*(8+1) + 4 + a_scriptpubkey.len() as u64 + b_scriptpubkey.len() as u64)*4 + 2 + 1 + 1 + 2*(1 + 72)
933 fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
935 let mut ins: Vec<TxIn> = Vec::new();
937 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
938 script_sig: Script::new(),
939 sequence: 0xffffffff,
945 assert!(self.pending_inbound_htlcs.is_empty());
946 assert!(self.pending_outbound_htlcs.is_empty());
947 let mut txouts: Vec<(TxOut, ())> = Vec::new();
949 let mut total_fee_satoshis = proposed_total_fee_satoshis;
950 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
951 let value_to_remote: i64 = ((self.channel_value_satoshis * 1000 - self.value_to_self_msat) as i64 / 1000) - if self.channel_outbound { 0 } else { total_fee_satoshis as i64 };
953 if value_to_self < 0 {
954 assert!(self.channel_outbound);
955 total_fee_satoshis += (-value_to_self) as u64;
956 } else if value_to_remote < 0 {
957 assert!(!self.channel_outbound);
958 total_fee_satoshis += (-value_to_remote) as u64;
961 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
963 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
964 value: value_to_remote as u64
968 if value_to_self as u64 > self.our_dust_limit_satoshis {
970 script_pubkey: self.get_closing_scriptpubkey(),
971 value: value_to_self as u64
975 transaction_utils::sort_outputs(&mut txouts);
977 let mut outputs: Vec<TxOut> = Vec::new();
978 for out in txouts.drain(..) {
987 }, total_fee_satoshis)
991 /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
992 /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
993 /// our counterparty!)
994 /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
995 /// TODO Some magic rust shit to compile-time check this?
996 fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, ChannelError> {
997 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number));
998 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key);
999 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
1001 Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &self.their_revocation_basepoint.unwrap(), &self.their_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap()), "Local tx keys generation got bogus keys"))
1005 /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
1006 /// will sign and send to our counterparty.
1007 /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
1008 fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, ChannelError> {
1009 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
1010 //may see payments to it!
1011 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
1012 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key);
1013 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
1015 Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &self.their_delayed_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap(), &revocation_basepoint, &payment_basepoint, &htlc_basepoint), "Remote tx keys generation got bogus keys"))
1018 /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
1019 /// pays to get_funding_redeemscript().to_v0_p2wsh()).
1020 /// Panics if called before accept_channel/new_from_req
1021 pub fn get_funding_redeemscript(&self) -> Script {
1022 let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
1023 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
1024 let their_funding_key = self.their_funding_pubkey.expect("get_funding_redeemscript only allowed after accept_channel").serialize();
1025 if our_funding_key[..] < their_funding_key[..] {
1026 builder.push_slice(&our_funding_key)
1027 .push_slice(&their_funding_key)
1029 builder.push_slice(&their_funding_key)
1030 .push_slice(&our_funding_key)
1031 }.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
1034 fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
1035 if tx.input.len() != 1 {
1036 panic!("Tried to sign commitment transaction that had input count != 1!");
1038 if tx.input[0].witness.len() != 0 {
1039 panic!("Tried to re-sign commitment transaction");
1042 let funding_redeemscript = self.get_funding_redeemscript();
1044 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1045 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
1047 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1049 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
1050 let their_funding_key = self.their_funding_pubkey.unwrap().serialize();
1051 if our_funding_key[..] < their_funding_key[..] {
1052 tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1053 tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1055 tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1056 tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1058 tx.input[0].witness[1].push(SigHashType::All as u8);
1059 tx.input[0].witness[2].push(SigHashType::All as u8);
1061 tx.input[0].witness.push(funding_redeemscript.into_bytes());
1066 /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
1067 /// @local is used only to convert relevant internal structures which refer to remote vs local
1068 /// to decide value of outputs and direction of HTLCs.
1069 fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys, feerate_per_kw: u64) -> Transaction {
1070 chan_utils::build_htlc_transaction(prev_hash, feerate_per_kw, if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
1073 fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), ChannelError> {
1074 if tx.input.len() != 1 {
1075 panic!("Tried to sign HTLC transaction that had input count != 1!");
1078 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
1080 let our_htlc_key = secp_check!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key), "Derived invalid key, peer is maliciously selecting parameters");
1081 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1082 let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key) == keys.a_htlc_key;
1083 Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key), is_local_tx))
1086 /// Signs a transaction created by build_htlc_transaction. If the transaction is an
1087 /// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
1088 fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, ChannelError> {
1089 if tx.input.len() != 1 {
1090 panic!("Tried to sign HTLC transaction that had input count != 1!");
1092 if tx.input[0].witness.len() != 0 {
1093 panic!("Tried to re-sign HTLC transaction");
1096 let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
1098 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1100 if local_tx { // b, then a
1101 tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1102 tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1104 tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1105 tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1107 tx.input[0].witness[1].push(SigHashType::All as u8);
1108 tx.input[0].witness[2].push(SigHashType::All as u8);
1111 tx.input[0].witness.push(Vec::new());
1113 tx.input[0].witness.push(preimage.unwrap().to_vec());
1116 tx.input[0].witness.push(htlc_redeemscript.into_bytes());
1121 /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
1122 /// In such cases we debug_assert!(false) and return an IgnoreError. Thus, will always return
1123 /// Ok(_) if debug assertions are turned on and preconditions are met.
1124 fn get_update_fulfill_htlc(&mut self, htlc_id_arg: u64, payment_preimage_arg: [u8; 32]) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitor>), ChannelError> {
1125 // Either ChannelFunded got set (which means it wont bet unset) or there is no way any
1126 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1127 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1129 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1130 panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1132 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1134 let mut sha = Sha256::new();
1135 sha.input(&payment_preimage_arg);
1136 let mut payment_hash_calc = [0; 32];
1137 sha.result(&mut payment_hash_calc);
1139 let mut pending_idx = std::usize::MAX;
1140 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1141 if htlc.htlc_id == htlc_id_arg {
1142 assert_eq!(htlc.payment_hash, payment_hash_calc);
1143 if let InboundHTLCState::Committed = htlc.state {
1145 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1146 // Don't return in release mode here so that we can update channel_monitor
1152 if pending_idx == std::usize::MAX {
1153 debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1154 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1157 // Now update local state:
1159 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1160 // can claim it even if the channel hits the chain before we see their next commitment.
1161 self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
1163 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1164 for pending_update in self.holding_cell_htlc_updates.iter() {
1165 match pending_update {
1166 &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1167 if htlc_id_arg == htlc_id {
1168 debug_assert!(false, "Tried to fulfill an HTLC we already had a pending fulfill for");
1169 return Ok((None, None));
1172 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1173 if htlc_id_arg == htlc_id {
1174 debug_assert!(false, "Tried to fulfill an HTLC we already had a holding-cell failure on");
1175 // Return the new channel monitor in a last-ditch effort to hit the
1176 // chain and claim the funds
1177 return Ok((None, Some(self.channel_monitor.clone())));
1183 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1184 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1186 return Ok((None, Some(self.channel_monitor.clone())));
1190 let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1191 if let InboundHTLCState::Committed = htlc.state {
1193 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1194 return Ok((None, Some(self.channel_monitor.clone())));
1196 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(payment_preimage_arg.clone()));
1199 Ok((Some(msgs::UpdateFulfillHTLC {
1200 channel_id: self.channel_id(),
1201 htlc_id: htlc_id_arg,
1202 payment_preimage: payment_preimage_arg,
1203 }), Some(self.channel_monitor.clone())))
1206 pub fn get_update_fulfill_htlc_and_commit(&mut self, htlc_id: u64, payment_preimage: [u8; 32]) -> Result<(Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, Option<ChannelMonitor>), ChannelError> {
1207 match self.get_update_fulfill_htlc(htlc_id, payment_preimage)? {
1208 (Some(update_fulfill_htlc), _) => {
1209 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1210 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1212 (None, Some(channel_monitor)) => Ok((None, Some(channel_monitor))),
1213 (None, None) => Ok((None, None))
1217 /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
1218 /// In such cases we debug_assert!(false) and return an IgnoreError. Thus, will always return
1219 /// Ok(_) if debug assertions are turned on and preconditions are met.
1220 pub fn get_update_fail_htlc(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, ChannelError> {
1221 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1222 panic!("Was asked to fail an HTLC when channel was not in an operational state");
1224 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1226 let mut pending_idx = std::usize::MAX;
1227 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1228 if htlc.htlc_id == htlc_id_arg {
1229 if let InboundHTLCState::Committed = htlc.state {
1231 debug_assert!(false, "Have an inbound HTLC we tried to fail before it was fully committed to");
1232 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1237 if pending_idx == std::usize::MAX {
1238 debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1239 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1242 // Now update local state:
1243 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1244 for pending_update in self.holding_cell_htlc_updates.iter() {
1245 match pending_update {
1246 &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1247 if htlc_id_arg == htlc_id {
1248 debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1249 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1252 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1253 if htlc_id_arg == htlc_id {
1254 debug_assert!(false, "Tried to fail an HTLC that we already had a pending failure for");
1261 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1262 htlc_id: htlc_id_arg,
1269 let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1270 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(err_packet.clone()));
1273 Ok(Some(msgs::UpdateFailHTLC {
1274 channel_id: self.channel_id(),
1275 htlc_id: htlc_id_arg,
1280 pub fn get_update_fail_htlc_and_commit(&mut self, htlc_id: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, ChannelError> {
1281 match self.get_update_fail_htlc(htlc_id, err_packet)? {
1282 Some(update_fail_htlc) => {
1283 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1284 Ok(Some((update_fail_htlc, commitment, monitor_update)))
1290 // Message handlers:
1292 pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel, config: &UserConfig) -> Result<(), ChannelError> {
1293 // Check sanity of message fields:
1294 if !self.channel_outbound {
1295 return Err(ChannelError::Close("Got an accept_channel message from an inbound peer"));
1297 if self.channel_state != ChannelState::OurInitSent as u32 {
1298 return Err(ChannelError::Close("Got an accept_channel message at a strange time"));
1300 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1301 return Err(ChannelError::Close("Peer never wants payout outputs?"));
1303 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1304 return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
1306 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
1307 return Err(ChannelError::Close("Bogus channel_reserve and dust_limit"));
1309 if msg.channel_reserve_satoshis < self.our_dust_limit_satoshis {
1310 return Err(ChannelError::Close("Peer never wants payout outputs?"));
1312 if msg.dust_limit_satoshis > Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) {
1313 return Err(ChannelError::Close("Dust limit is bigger than our channel reverse"));
1315 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1316 return Err(ChannelError::Close("Minimum htlc value is full channel value"));
1318 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1319 return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
1321 if msg.max_accepted_htlcs < 1 {
1322 return Err(ChannelError::Close("0 max_accpted_htlcs makes for a useless channel"));
1324 if msg.max_accepted_htlcs > 483 {
1325 return Err(ChannelError::Close("max_accpted_htlcs > 483"));
1328 // Now check against optional parameters as set by config...
1329 if msg.htlc_minimum_msat > config.channel_limits.max_htlc_minimum_msat {
1330 return Err(ChannelError::Close("htlc minimum msat is higher than the user specified limit"));
1332 if msg.max_htlc_value_in_flight_msat < config.channel_limits.min_max_htlc_value_in_flight_msat {
1333 return Err(ChannelError::Close("max htlc value in flight msat is less than the user specified limit"));
1335 if msg.channel_reserve_satoshis > config.channel_limits.max_channel_reserve_satoshis {
1336 return Err(ChannelError::Close("channel reserve satoshis is higher than the user specified limit"));
1338 if msg.max_accepted_htlcs < config.channel_limits.min_max_accepted_htlcs {
1339 return Err(ChannelError::Close("max accepted htlcs is less than the user specified limit"));
1341 if msg.dust_limit_satoshis < config.channel_limits.min_dust_limit_satoshis {
1342 return Err(ChannelError::Close("dust limit satoshis is less than the user specified limit"));
1344 if msg.dust_limit_satoshis > config.channel_limits.max_dust_limit_satoshis {
1345 return Err(ChannelError::Close("dust limit satoshis is greater than the user specified limit"));
1347 if msg.minimum_depth > config.channel_limits.max_minimum_depth {
1348 return Err(ChannelError::Close("We consider the minimum depth to be unreasonably large"));
1351 self.channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
1353 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1354 self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1355 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1356 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1357 self.their_to_self_delay = msg.to_self_delay;
1358 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1359 self.minimum_depth = msg.minimum_depth;
1360 self.their_funding_pubkey = Some(msg.funding_pubkey);
1361 self.their_revocation_basepoint = Some(msg.revocation_basepoint);
1362 self.their_payment_basepoint = Some(msg.payment_basepoint);
1363 self.their_delayed_payment_basepoint = Some(msg.delayed_payment_basepoint);
1364 self.their_htlc_basepoint = Some(msg.htlc_basepoint);
1365 self.their_cur_commitment_point = Some(msg.first_per_commitment_point);
1367 let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
1368 self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
1369 self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
1371 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1376 fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Transaction, Signature, TxCreationKeys), ChannelError> {
1377 let funding_script = self.get_funding_redeemscript();
1379 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1380 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1381 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1383 // They sign the "local" commitment transaction...
1384 secp_check!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey.unwrap()), "Invalid funding_created signature from peer");
1386 // ...and we sign it, allowing us to broadcast the tx if we wish
1387 self.sign_commitment_transaction(&mut local_initial_commitment_tx, sig);
1389 let remote_keys = self.build_remote_transaction_keys()?;
1390 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
1391 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1393 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1394 Ok((remote_initial_commitment_tx, local_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key), local_keys))
1397 pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), ChannelError> {
1398 if self.channel_outbound {
1399 return Err(ChannelError::Close("Received funding_created for an outbound channel?"));
1401 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1402 // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1403 // remember the channel, so its safe to just send an error_message here and drop the
1405 return Err(ChannelError::Close("Received funding_created after we got the channel!"));
1407 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1408 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1409 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1410 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1413 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1414 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
1415 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
1417 let (remote_initial_commitment_tx, local_initial_commitment_tx, our_signature, local_keys) = match self.funding_created_signature(&msg.signature) {
1420 self.channel_monitor.unset_funding_info();
1425 // Now that we're past error-generating stuff, update our local state:
1427 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number, self.their_cur_commitment_point.unwrap());
1428 self.last_local_commitment_txn = vec![local_initial_commitment_tx.clone()];
1429 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx, local_keys, self.feerate_per_kw, Vec::new());
1430 self.channel_state = ChannelState::FundingSent as u32;
1431 self.channel_id = funding_txo.to_channel_id();
1432 self.cur_remote_commitment_transaction_number -= 1;
1433 self.cur_local_commitment_transaction_number -= 1;
1435 Ok((msgs::FundingSigned {
1436 channel_id: self.channel_id,
1437 signature: our_signature
1438 }, self.channel_monitor.clone()))
1441 /// Handles a funding_signed message from the remote end.
1442 /// If this call is successful, broadcast the funding transaction (and not before!)
1443 pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, ChannelError> {
1444 if !self.channel_outbound {
1445 return Err(ChannelError::Close("Received funding_signed for an inbound channel?"));
1447 if self.channel_state != ChannelState::FundingCreated as u32 {
1448 return Err(ChannelError::Close("Received funding_signed in strange state!"));
1450 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1451 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER - 1 ||
1452 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1453 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1456 let funding_script = self.get_funding_redeemscript();
1458 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1459 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1460 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1462 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1463 secp_check!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid funding_signed signature from peer");
1465 self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
1466 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
1467 self.last_local_commitment_txn = vec![local_initial_commitment_tx];
1468 self.channel_state = ChannelState::FundingSent as u32;
1469 self.cur_local_commitment_transaction_number -= 1;
1471 Ok(self.channel_monitor.clone())
1474 pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), ChannelError> {
1475 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1476 return Err(ChannelError::Close("Peer sent funding_locked when we needed a channel_reestablish"));
1479 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
1481 if non_shutdown_state == ChannelState::FundingSent as u32 {
1482 self.channel_state |= ChannelState::TheirFundingLocked as u32;
1483 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1484 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
1485 self.channel_update_count += 1;
1486 } else if self.channel_state & (ChannelState::ChannelFunded as u32) != 0 &&
1487 // Note that funding_signed/funding_created will have decremented both by 1!
1488 self.cur_local_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 &&
1489 self.cur_remote_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 {
1490 if self.their_cur_commitment_point != Some(msg.next_per_commitment_point) {
1491 return Err(ChannelError::Close("Peer sent a reconnect funding_locked with a different point"));
1493 // They probably disconnected/reconnected and re-sent the funding_locked, which is required
1496 return Err(ChannelError::Close("Peer sent a funding_locked at a strange time"));
1499 self.their_prev_commitment_point = self.their_cur_commitment_point;
1500 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1504 /// Returns (inbound_htlc_count, htlc_inbound_value_msat)
1505 fn get_inbound_pending_htlc_stats(&self) -> (u32, u64) {
1506 let mut htlc_inbound_value_msat = 0;
1507 for ref htlc in self.pending_inbound_htlcs.iter() {
1508 htlc_inbound_value_msat += htlc.amount_msat;
1510 (self.pending_inbound_htlcs.len() as u32, htlc_inbound_value_msat)
1513 /// Returns (outbound_htlc_count, htlc_outbound_value_msat)
1514 fn get_outbound_pending_htlc_stats(&self) -> (u32, u64) {
1515 let mut htlc_outbound_value_msat = 0;
1516 for ref htlc in self.pending_outbound_htlcs.iter() {
1517 htlc_outbound_value_msat += htlc.amount_msat;
1520 (self.pending_outbound_htlcs.len() as u32, htlc_outbound_value_msat)
1523 pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingHTLCStatus) -> Result<(), ChannelError> {
1524 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1525 return Err(ChannelError::Close("Got add HTLC message when channel was not in an operational state"));
1527 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1528 return Err(ChannelError::Close("Peer sent update_add_htlc when we needed a channel_reestablish"));
1530 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1531 return Err(ChannelError::Close("Remote side tried to send more than the total value of the channel"));
1533 if msg.amount_msat < self.our_htlc_minimum_msat {
1534 return Err(ChannelError::Close("Remote side tried to send less than our minimum HTLC value"));
1537 let (inbound_htlc_count, htlc_inbound_value_msat) = self.get_inbound_pending_htlc_stats();
1538 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1539 return Err(ChannelError::Close("Remote tried to push more than our max accepted HTLCs"));
1541 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
1542 // Check our_max_htlc_value_in_flight_msat
1543 if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1544 return Err(ChannelError::Close("Remote HTLC add would put them over their max HTLC value in flight"));
1546 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1547 // the reserve_satoshis we told them to always have as direct payment so that they lose
1548 // something if we punish them for broadcasting an old state).
1549 if htlc_inbound_value_msat + msg.amount_msat + self.value_to_self_msat > (self.channel_value_satoshis - Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis)) * 1000 {
1550 return Err(ChannelError::Close("Remote HTLC add would put them over their reserve value"));
1552 if self.next_remote_htlc_id != msg.htlc_id {
1553 return Err(ChannelError::Close("Remote skipped HTLC ID"));
1555 if msg.cltv_expiry >= 500000000 {
1556 return Err(ChannelError::Close("Remote provided CLTV expiry in seconds instead of block height"));
1559 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1561 if self.channel_state & ChannelState::LocalShutdownSent as u32 != 0 {
1562 if let PendingHTLCStatus::Forward(_) = pending_forward_state {
1563 panic!("ChannelManager shouldn't be trying to add a forwardable HTLC after we've started closing");
1567 // Now update local state:
1568 self.next_remote_htlc_id += 1;
1569 self.pending_inbound_htlcs.push(InboundHTLCOutput {
1570 htlc_id: msg.htlc_id,
1571 amount_msat: msg.amount_msat,
1572 payment_hash: msg.payment_hash,
1573 cltv_expiry: msg.cltv_expiry,
1574 state: InboundHTLCState::RemoteAnnounced(pending_forward_state),
1580 /// Marks an outbound HTLC which we have received update_fail/fulfill/malformed
1582 fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, ChannelError> {
1583 for htlc in self.pending_outbound_htlcs.iter_mut() {
1584 if htlc.htlc_id == htlc_id {
1585 match check_preimage {
1587 Some(payment_hash) =>
1588 if payment_hash != htlc.payment_hash {
1589 return Err(ChannelError::Close("Remote tried to fulfill HTLC with an incorrect preimage"));
1593 OutboundHTLCState::LocalAnnounced(_) =>
1594 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC before it had been committed")),
1595 OutboundHTLCState::Committed => {
1596 htlc.state = OutboundHTLCState::RemoteRemoved;
1597 htlc.fail_reason = fail_reason;
1599 OutboundHTLCState::AwaitingRemoteRevokeToRemove | OutboundHTLCState::AwaitingRemovedRemoteRevoke | OutboundHTLCState::RemoteRemoved =>
1600 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC that they'd already fulfilled/failed")),
1602 return Ok(&htlc.source);
1605 Err(ChannelError::Close("Remote tried to fulfill/fail an HTLC we couldn't find"))
1608 pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<HTLCSource, ChannelError> {
1609 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1610 return Err(ChannelError::Close("Got fulfill HTLC message when channel was not in an operational state"));
1612 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1613 return Err(ChannelError::Close("Peer sent update_fulfill_htlc when we needed a channel_reestablish"));
1616 let mut sha = Sha256::new();
1617 sha.input(&msg.payment_preimage);
1618 let mut payment_hash = [0; 32];
1619 sha.result(&mut payment_hash);
1621 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None).map(|source| source.clone())
1624 pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
1625 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1626 return Err(ChannelError::Close("Got fail HTLC message when channel was not in an operational state"));
1628 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1629 return Err(ChannelError::Close("Peer sent update_fail_htlc when we needed a channel_reestablish"));
1632 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
1636 pub fn update_fail_malformed_htlc<'a>(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
1637 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1638 return Err(ChannelError::Close("Got fail malformed HTLC message when channel was not in an operational state"));
1640 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1641 return Err(ChannelError::Close("Peer sent update_fail_malformed_htlc when we needed a channel_reestablish"));
1644 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
1648 pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned, fee_estimator: &FeeEstimator) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, Option<msgs::ClosingSigned>, ChannelMonitor), ChannelError> {
1649 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1650 return Err(ChannelError::Close("Got commitment signed message when channel was not in an operational state"));
1652 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1653 return Err(ChannelError::Close("Peer sent commitment_signed when we needed a channel_reestablish"));
1655 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
1656 return Err(ChannelError::Close("Peer sent commitment_signed after we'd started exchanging closing_signeds"));
1659 let funding_script = self.get_funding_redeemscript();
1661 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1663 let mut update_fee = false;
1664 let feerate_per_kw = if !self.channel_outbound && self.pending_update_fee.is_some() {
1666 self.pending_update_fee.unwrap()
1671 let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, feerate_per_kw);
1672 let local_commitment_txid = local_commitment_tx.0.txid();
1673 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_commitment_tx.0).sighash_all(&local_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1674 secp_check!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid commitment tx signature from peer");
1676 //If channel fee was updated by funder confirm funder can afford the new fee rate when applied to the current local commitment transaction
1678 let num_htlcs = local_commitment_tx.1.len();
1679 let total_fee: u64 = feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT + (num_htlcs as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
1681 if self.channel_value_satoshis - self.value_to_self_msat / 1000 < total_fee + self.their_channel_reserve_satoshis {
1682 return Err(ChannelError::Close("Funding remote cannot afford proposed new fee"));
1686 if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
1687 return Err(ChannelError::Close("Got wrong number of HTLC signatures from remote"));
1690 let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
1691 self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
1692 new_local_commitment_txn.push(local_commitment_tx.0.clone());
1694 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
1695 for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
1696 let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys, feerate_per_kw);
1697 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1698 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1699 secp_check!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx signature from peer");
1700 let htlc_sig = if htlc.offered {
1701 let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
1702 new_local_commitment_txn.push(htlc_tx);
1705 self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
1707 htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
1710 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1));
1711 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
1713 // Update state now that we've passed all the can-fail calls...
1714 let mut need_our_commitment = false;
1715 if !self.channel_outbound {
1716 if let Some(fee_update) = self.pending_update_fee {
1717 self.feerate_per_kw = fee_update;
1718 // We later use the presence of pending_update_fee to indicate we should generate a
1719 // commitment_signed upon receipt of revoke_and_ack, so we can only set it to None
1720 // if we're not awaiting a revoke (ie will send a commitment_signed now).
1721 if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) == 0 {
1722 need_our_commitment = true;
1723 self.pending_update_fee = None;
1728 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
1729 // This is a response to our post-monitor-failed unfreeze messages, so we can clear the
1730 // monitor_pending_order requirement as we won't re-send the monitor_pending messages.
1731 self.monitor_pending_order = None;
1734 self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
1736 for htlc in self.pending_inbound_htlcs.iter_mut() {
1737 let new_forward = if let &InboundHTLCState::RemoteAnnounced(ref forward_info) = &htlc.state {
1738 Some(forward_info.clone())
1740 if let Some(forward_info) = new_forward {
1741 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info);
1742 need_our_commitment = true;
1745 for htlc in self.pending_outbound_htlcs.iter_mut() {
1746 if let OutboundHTLCState::RemoteRemoved = htlc.state {
1747 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove;
1748 need_our_commitment = true;
1752 self.cur_local_commitment_transaction_number -= 1;
1753 self.last_local_commitment_txn = new_local_commitment_txn;
1754 self.received_commitment_while_awaiting_raa = (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) != 0;
1756 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0 {
1757 self.monitor_pending_revoke_and_ack = true;
1758 self.monitor_pending_commitment_signed |= need_our_commitment;
1759 return Err(ChannelError::Ignore("Previous monitor update failure prevented generation of RAA"));
1762 let (our_commitment_signed, monitor_update, closing_signed) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1763 // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1764 // we'll send one right away when we get the revoke_and_ack when we
1765 // free_holding_cell_htlcs().
1766 let (msg, monitor) = self.send_commitment_no_status_check()?;
1767 (Some(msg), monitor, None)
1768 } else if !need_our_commitment {
1769 (None, self.channel_monitor.clone(), self.maybe_propose_first_closing_signed(fee_estimator))
1770 } else { (None, self.channel_monitor.clone(), None) };
1772 Ok((msgs::RevokeAndACK {
1773 channel_id: self.channel_id,
1774 per_commitment_secret: per_commitment_secret,
1775 next_per_commitment_point: next_per_commitment_point,
1776 }, our_commitment_signed, closing_signed, monitor_update))
1779 /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1780 /// fulfilling or failing the last pending HTLC)
1781 fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, ChannelError> {
1782 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
1783 if self.holding_cell_htlc_updates.len() != 0 || self.holding_cell_update_fee.is_some() {
1784 let mut htlc_updates = Vec::new();
1785 mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1786 let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1787 let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1788 let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1790 for htlc_update in htlc_updates.drain(..) {
1791 // Note that this *can* fail, though it should be due to rather-rare conditions on
1792 // fee races with adding too many outputs which push our total payments just over
1793 // the limit. In case its less rare than I anticipate, we may want to revisit
1794 // handling this case better and maybe fufilling some of the HTLCs while attempting
1795 // to rebalance channels.
1796 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1797 self.holding_cell_htlc_updates.push(htlc_update);
1799 match &htlc_update {
1800 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref source, ref onion_routing_packet, ..} => {
1801 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone()) {
1802 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1808 &HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, htlc_id, .. } => {
1809 match self.get_update_fulfill_htlc(htlc_id, payment_preimage) {
1810 Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.0.unwrap()),
1812 if let ChannelError::Ignore(_) = e {}
1814 panic!("Got a non-IgnoreError action trying to fulfill holding cell HTLC");
1819 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
1820 match self.get_update_fail_htlc(htlc_id, err_packet.clone()) {
1821 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
1823 if let ChannelError::Ignore(_) = e {}
1825 panic!("Got a non-IgnoreError action trying to fail holding cell HTLC");
1832 self.holding_cell_htlc_updates.push(htlc_update);
1836 //TODO: Need to examine the type of err - if its a fee issue or similar we may want to
1837 //fail it back the route, if its a temporary issue we can ignore it...
1840 if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() && self.holding_cell_update_fee.is_none() {
1841 // This should never actually happen and indicates we got some Errs back
1842 // from update_fulfill_htlc/update_fail_htlc, but we handle it anyway in
1843 // case there is some strange way to hit duplicate HTLC removes.
1846 let update_fee = if let Some(feerate) = self.holding_cell_update_fee {
1847 self.pending_update_fee = self.holding_cell_update_fee.take();
1848 Some(msgs::UpdateFee {
1849 channel_id: self.channel_id,
1850 feerate_per_kw: feerate as u32,
1855 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1856 Ok(Some((msgs::CommitmentUpdate {
1858 update_fulfill_htlcs,
1860 update_fail_malformed_htlcs: Vec::new(),
1861 update_fee: update_fee,
1863 }, monitor_update)))
1872 /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
1873 /// commitment_signed message here in case we had pending outbound HTLCs to add which were
1874 /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
1875 /// generating an appropriate error *after* the channel state has been updated based on the
1876 /// revoke_and_ack message.
1877 pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK, fee_estimator: &FeeEstimator) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>, Option<msgs::ClosingSigned>, ChannelMonitor), ChannelError> {
1878 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1879 return Err(ChannelError::Close("Got revoke/ACK message when channel was not in an operational state"));
1881 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1882 return Err(ChannelError::Close("Peer sent revoke_and_ack when we needed a channel_reestablish"));
1884 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
1885 return Err(ChannelError::Close("Peer sent revoke_and_ack after we'd started exchanging closing_signeds"));
1888 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
1889 if PublicKey::from_secret_key(&self.secp_ctx, &secp_check!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret")) != their_prev_commitment_point {
1890 return Err(ChannelError::Close("Got a revoke commitment secret which didn't correspond to their current pubkey"));
1893 self.channel_monitor.provide_secret(self.cur_remote_commitment_transaction_number + 1, msg.per_commitment_secret)
1894 .map_err(|e| ChannelError::Close(e.0))?;
1896 // Update state now that we've passed all the can-fail calls...
1897 // (note that we may still fail to generate the new commitment_signed message, but that's
1898 // OK, we step the channel here and *then* if the new generation fails we can fail the
1899 // channel based on that, but stepping stuff here should be safe either way.
1900 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
1901 self.their_prev_commitment_point = self.their_cur_commitment_point;
1902 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1903 self.cur_remote_commitment_transaction_number -= 1;
1904 self.received_commitment_while_awaiting_raa = false;
1905 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
1906 // This is a response to our post-monitor-failed unfreeze messages, so we can clear the
1907 // monitor_pending_order requirement as we won't re-send the monitor_pending messages.
1908 self.monitor_pending_order = None;
1911 let mut to_forward_infos = Vec::new();
1912 let mut revoked_htlcs = Vec::new();
1913 let mut update_fail_htlcs = Vec::new();
1914 let mut update_fail_malformed_htlcs = Vec::new();
1915 let mut require_commitment = false;
1916 let mut value_to_self_msat_diff: i64 = 0;
1917 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1918 self.pending_inbound_htlcs.retain(|htlc| {
1919 if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
1920 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1921 value_to_self_msat_diff += htlc.amount_msat as i64;
1926 self.pending_outbound_htlcs.retain(|htlc| {
1927 if let OutboundHTLCState::AwaitingRemovedRemoteRevoke = htlc.state {
1928 if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
1929 revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
1931 // They fulfilled, so we sent them money
1932 value_to_self_msat_diff -= htlc.amount_msat as i64;
1937 for htlc in self.pending_inbound_htlcs.iter_mut() {
1938 let swap = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) = &htlc.state {
1940 } else if let &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) = &htlc.state {
1944 let mut state = InboundHTLCState::Committed;
1945 mem::swap(&mut state, &mut htlc.state);
1947 if let InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info) = state {
1948 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info);
1949 require_commitment = true;
1950 } else if let InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info) = state {
1951 match forward_info {
1952 PendingHTLCStatus::Fail(fail_msg) => {
1953 require_commitment = true;
1955 HTLCFailureMsg::Relay(msg) => {
1956 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(msg.reason.clone()));
1957 update_fail_htlcs.push(msg)
1959 HTLCFailureMsg::Malformed(msg) => {
1960 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailMalformed((msg.sha256_of_onion, msg.failure_code)));
1961 update_fail_malformed_htlcs.push(msg)
1965 PendingHTLCStatus::Forward(forward_info) => {
1966 to_forward_infos.push((forward_info, htlc.htlc_id));
1967 htlc.state = InboundHTLCState::Committed;
1973 for htlc in self.pending_outbound_htlcs.iter_mut() {
1974 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
1975 htlc.state = OutboundHTLCState::Committed;
1976 } else if let OutboundHTLCState::AwaitingRemoteRevokeToRemove = htlc.state {
1977 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
1978 require_commitment = true;
1981 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
1983 if self.channel_outbound {
1984 if let Some(feerate) = self.pending_update_fee.take() {
1985 self.feerate_per_kw = feerate;
1988 if let Some(feerate) = self.pending_update_fee {
1989 // Because a node cannot send two commitment_signed's in a row without getting a
1990 // revoke_and_ack from us (as it would otherwise not know the per_commitment_point
1991 // it should use to create keys with) and because a node can't send a
1992 // commitment_signed without changes, checking if the feerate is equal to the
1993 // pending feerate update is sufficient to detect require_commitment.
1994 if feerate == self.feerate_per_kw {
1995 require_commitment = true;
1996 self.pending_update_fee = None;
2001 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) == ChannelState::MonitorUpdateFailed as u32 {
2002 // We can't actually generate a new commitment transaction (incl by freeing holding
2003 // cells) while we can't update the monitor, so we just return what we have.
2004 if require_commitment {
2005 self.monitor_pending_commitment_signed = true;
2007 self.monitor_pending_forwards.append(&mut to_forward_infos);
2008 self.monitor_pending_failures.append(&mut revoked_htlcs);
2009 return Ok((None, Vec::new(), Vec::new(), None, self.channel_monitor.clone()));
2012 match self.free_holding_cell_htlcs()? {
2013 Some(mut commitment_update) => {
2014 commitment_update.0.update_fail_htlcs.reserve(update_fail_htlcs.len());
2015 for fail_msg in update_fail_htlcs.drain(..) {
2016 commitment_update.0.update_fail_htlcs.push(fail_msg);
2018 commitment_update.0.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
2019 for fail_msg in update_fail_malformed_htlcs.drain(..) {
2020 commitment_update.0.update_fail_malformed_htlcs.push(fail_msg);
2022 Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, None, commitment_update.1))
2025 if require_commitment {
2026 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2027 Ok((Some(msgs::CommitmentUpdate {
2028 update_add_htlcs: Vec::new(),
2029 update_fulfill_htlcs: Vec::new(),
2031 update_fail_malformed_htlcs,
2034 }), to_forward_infos, revoked_htlcs, None, monitor_update))
2036 Ok((None, to_forward_infos, revoked_htlcs, self.maybe_propose_first_closing_signed(fee_estimator), self.channel_monitor.clone()))
2043 /// Adds a pending update to this channel. See the doc for send_htlc for
2044 /// further details on the optionness of the return value.
2045 /// You MUST call send_commitment prior to any other calls on this Channel
2046 fn send_update_fee(&mut self, feerate_per_kw: u64) -> Option<msgs::UpdateFee> {
2047 if !self.channel_outbound {
2048 panic!("Cannot send fee from inbound channel");
2050 if !self.is_usable() {
2051 panic!("Cannot update fee until channel is fully established and we haven't started shutting down");
2053 if !self.is_live() {
2054 panic!("Cannot update fee while peer is disconnected/we're awaiting a monitor update (ChannelManager should have caught this)");
2057 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2058 self.holding_cell_update_fee = Some(feerate_per_kw);
2062 debug_assert!(self.pending_update_fee.is_none());
2063 self.pending_update_fee = Some(feerate_per_kw);
2065 Some(msgs::UpdateFee {
2066 channel_id: self.channel_id,
2067 feerate_per_kw: feerate_per_kw as u32,
2071 pub fn send_update_fee_and_commit(&mut self, feerate_per_kw: u64) -> Result<Option<(msgs::UpdateFee, msgs::CommitmentSigned, ChannelMonitor)>, ChannelError> {
2072 match self.send_update_fee(feerate_per_kw) {
2073 Some(update_fee) => {
2074 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2075 Ok(Some((update_fee, commitment_signed, monitor_update)))
2081 /// Removes any uncommitted HTLCs, to be used on peer disconnection, including any pending
2082 /// HTLCs that we intended to add but haven't as we were waiting on a remote revoke.
2083 /// Returns the set of PendingHTLCStatuses from remote uncommitted HTLCs (which we're
2084 /// implicitly dropping) and the payment_hashes of HTLCs we tried to add but are dropping.
2085 /// No further message handling calls may be made until a channel_reestablish dance has
2087 pub fn remove_uncommitted_htlcs_and_mark_paused(&mut self) -> Vec<(HTLCSource, [u8; 32])> {
2088 let mut outbound_drops = Vec::new();
2090 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2091 if self.channel_state < ChannelState::FundingSent as u32 {
2092 self.channel_state = ChannelState::ShutdownComplete as u32;
2093 return outbound_drops;
2095 // Upon reconnect we have to start the closing_signed dance over, but shutdown messages
2096 // will be retransmitted.
2097 self.last_sent_closing_fee = None;
2099 let mut inbound_drop_count = 0;
2100 self.pending_inbound_htlcs.retain(|htlc| {
2102 InboundHTLCState::RemoteAnnounced(_) => {
2103 // They sent us an update_add_htlc but we never got the commitment_signed.
2104 // We'll tell them what commitment_signed we're expecting next and they'll drop
2105 // this HTLC accordingly
2106 inbound_drop_count += 1;
2109 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_)|InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => {
2110 // We received a commitment_signed updating this HTLC and (at least hopefully)
2111 // sent a revoke_and_ack (which we can re-transmit) and have heard nothing
2112 // in response to it yet, so don't touch it.
2115 InboundHTLCState::Committed => true,
2116 InboundHTLCState::LocalRemoved(_) => {
2117 // We (hopefully) sent a commitment_signed updating this HTLC (which we can
2118 // re-transmit if needed) and they may have even sent a revoke_and_ack back
2119 // (that we missed). Keep this around for now and if they tell us they missed
2120 // the commitment_signed we can re-transmit the update then.
2125 self.next_remote_htlc_id -= inbound_drop_count;
2127 for htlc in self.pending_outbound_htlcs.iter_mut() {
2128 if let OutboundHTLCState::RemoteRemoved = htlc.state {
2129 // They sent us an update to remove this but haven't yet sent the corresponding
2130 // commitment_signed, we need to move it back to Committed and they can re-send
2131 // the update upon reconnection.
2132 htlc.state = OutboundHTLCState::Committed;
2136 self.holding_cell_htlc_updates.retain(|htlc_update| {
2138 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2139 outbound_drops.push((source.clone(), payment_hash.clone()));
2142 &HTLCUpdateAwaitingACK::ClaimHTLC {..} | &HTLCUpdateAwaitingACK::FailHTLC {..} => true,
2145 self.channel_state |= ChannelState::PeerDisconnected as u32;
2146 log_debug!(self, "Peer disconnection resulted in {} remote-announced HTLC drops and {} waiting-to-locally-announced HTLC drops on channel {}", outbound_drops.len(), inbound_drop_count, log_bytes!(self.channel_id()));
2150 /// Indicates that a ChannelMonitor update failed to be stored by the client and further
2151 /// updates are partially paused.
2152 /// This must be called immediately after the call which generated the ChannelMonitor update
2153 /// which failed, with the order argument set to the type of call it represented (ie a
2154 /// commitment update or a revoke_and_ack generation). The messages which were generated from
2155 /// that original call must *not* have been sent to the remote end, and must instead have been
2156 /// dropped. They will be regenerated when monitor_updating_restored is called.
2157 pub fn monitor_update_failed(&mut self, order: RAACommitmentOrder) {
2158 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
2160 RAACommitmentOrder::CommitmentFirst => {
2161 self.monitor_pending_revoke_and_ack = false;
2162 self.monitor_pending_commitment_signed = true;
2164 RAACommitmentOrder::RevokeAndACKFirst => {
2165 self.monitor_pending_revoke_and_ack = true;
2166 self.monitor_pending_commitment_signed = false;
2169 self.monitor_pending_order = Some(order);
2170 self.channel_state |= ChannelState::MonitorUpdateFailed as u32;
2173 /// Indicates that the latest ChannelMonitor update has been committed by the client
2174 /// successfully and we should restore normal operation. Returns messages which should be sent
2175 /// to the remote side.
2176 pub fn monitor_updating_restored(&mut self) -> (Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, RAACommitmentOrder, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>) {
2177 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, ChannelState::MonitorUpdateFailed as u32);
2178 self.channel_state &= !(ChannelState::MonitorUpdateFailed as u32);
2180 let mut forwards = Vec::new();
2181 mem::swap(&mut forwards, &mut self.monitor_pending_forwards);
2182 let mut failures = Vec::new();
2183 mem::swap(&mut failures, &mut self.monitor_pending_failures);
2185 if self.channel_state & (ChannelState::PeerDisconnected as u32) != 0 {
2186 // Leave monitor_pending_order so we can order our channel_reestablish responses
2187 self.monitor_pending_revoke_and_ack = false;
2188 self.monitor_pending_commitment_signed = false;
2189 return (None, None, RAACommitmentOrder::RevokeAndACKFirst, forwards, failures);
2192 let raa = if self.monitor_pending_revoke_and_ack {
2193 Some(self.get_last_revoke_and_ack())
2195 let commitment_update = if self.monitor_pending_commitment_signed {
2196 Some(self.get_last_commitment_update())
2199 self.monitor_pending_revoke_and_ack = false;
2200 self.monitor_pending_commitment_signed = false;
2201 (raa, commitment_update, self.monitor_pending_order.clone().unwrap(), forwards, failures)
2204 pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), ChannelError> {
2205 if self.channel_outbound {
2206 return Err(ChannelError::Close("Non-funding remote tried to update channel fee"));
2208 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2209 return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish"));
2211 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
2212 self.pending_update_fee = Some(msg.feerate_per_kw as u64);
2213 self.channel_update_count += 1;
2217 fn get_last_revoke_and_ack(&self) -> msgs::RevokeAndACK {
2218 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number));
2219 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 2);
2220 msgs::RevokeAndACK {
2221 channel_id: self.channel_id,
2222 per_commitment_secret,
2223 next_per_commitment_point,
2227 fn get_last_commitment_update(&self) -> msgs::CommitmentUpdate {
2228 let mut update_add_htlcs = Vec::new();
2229 let mut update_fulfill_htlcs = Vec::new();
2230 let mut update_fail_htlcs = Vec::new();
2231 let mut update_fail_malformed_htlcs = Vec::new();
2233 for htlc in self.pending_outbound_htlcs.iter() {
2234 if let &OutboundHTLCState::LocalAnnounced(ref onion_packet) = &htlc.state {
2235 update_add_htlcs.push(msgs::UpdateAddHTLC {
2236 channel_id: self.channel_id(),
2237 htlc_id: htlc.htlc_id,
2238 amount_msat: htlc.amount_msat,
2239 payment_hash: htlc.payment_hash,
2240 cltv_expiry: htlc.cltv_expiry,
2241 onion_routing_packet: (**onion_packet).clone(),
2246 for htlc in self.pending_inbound_htlcs.iter() {
2247 if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
2249 &InboundHTLCRemovalReason::FailRelay(ref err_packet) => {
2250 update_fail_htlcs.push(msgs::UpdateFailHTLC {
2251 channel_id: self.channel_id(),
2252 htlc_id: htlc.htlc_id,
2253 reason: err_packet.clone()
2256 &InboundHTLCRemovalReason::FailMalformed((ref sha256_of_onion, ref failure_code)) => {
2257 update_fail_malformed_htlcs.push(msgs::UpdateFailMalformedHTLC {
2258 channel_id: self.channel_id(),
2259 htlc_id: htlc.htlc_id,
2260 sha256_of_onion: sha256_of_onion.clone(),
2261 failure_code: failure_code.clone(),
2264 &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
2265 update_fulfill_htlcs.push(msgs::UpdateFulfillHTLC {
2266 channel_id: self.channel_id(),
2267 htlc_id: htlc.htlc_id,
2268 payment_preimage: payment_preimage.clone(),
2275 msgs::CommitmentUpdate {
2276 update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs,
2277 update_fee: None, //TODO: We need to support re-generating any update_fees in the last commitment_signed!
2278 commitment_signed: self.send_commitment_no_state_update().expect("It looks like we failed to re-generate a commitment_signed we had previously sent?").0,
2282 /// May panic if some calls other than message-handling calls (which will all Err immediately)
2283 /// have been called between remove_uncommitted_htlcs_and_mark_paused and this call.
2284 pub fn channel_reestablish(&mut self, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, Option<ChannelMonitor>, RAACommitmentOrder, Option<msgs::Shutdown>), ChannelError> {
2285 if self.channel_state & (ChannelState::PeerDisconnected as u32) == 0 {
2286 // While BOLT 2 doesn't indicate explicitly we should error this channel here, it
2287 // almost certainly indicates we are going to end up out-of-sync in some way, so we
2288 // just close here instead of trying to recover.
2289 return Err(ChannelError::Close("Peer sent a loose channel_reestablish not after reconnect"));
2292 if msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
2293 msg.next_local_commitment_number == 0 {
2294 return Err(ChannelError::Close("Peer sent a garbage channel_reestablish"));
2297 // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
2298 // remaining cases either succeed or ErrorMessage-fail).
2299 self.channel_state &= !(ChannelState::PeerDisconnected as u32);
2301 let shutdown_msg = if self.channel_state & (ChannelState::LocalShutdownSent as u32) != 0 {
2302 Some(msgs::Shutdown {
2303 channel_id: self.channel_id,
2304 scriptpubkey: self.get_closing_scriptpubkey(),
2308 if self.channel_state & (ChannelState::FundingSent as u32) == ChannelState::FundingSent as u32 {
2309 if self.channel_state & ChannelState::OurFundingLocked as u32 == 0 {
2310 if msg.next_remote_commitment_number != 0 {
2311 return Err(ChannelError::Close("Peer claimed they saw a revoke_and_ack but we haven't sent funding_locked yet"));
2313 // Short circuit the whole handler as there is nothing we can resend them
2314 return Ok((None, None, None, None, RAACommitmentOrder::CommitmentFirst, shutdown_msg));
2317 // We have OurFundingLocked set!
2318 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2319 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2320 return Ok((Some(msgs::FundingLocked {
2321 channel_id: self.channel_id(),
2322 next_per_commitment_point: next_per_commitment_point,
2323 }), None, None, None, RAACommitmentOrder::CommitmentFirst, shutdown_msg));
2326 let required_revoke = if msg.next_remote_commitment_number + 1 == INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
2327 // Remote isn't waiting on any RevokeAndACK from us!
2328 // Note that if we need to repeat our FundingLocked we'll do that in the next if block.
2330 } else if msg.next_remote_commitment_number + 1 == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_local_commitment_transaction_number {
2331 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2332 self.monitor_pending_revoke_and_ack = true;
2335 Some(self.get_last_revoke_and_ack())
2338 return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old local commitment transaction"));
2341 // We increment cur_remote_commitment_transaction_number only upon receipt of
2342 // revoke_and_ack, not on sending commitment_signed, so we add one if have
2343 // AwaitingRemoteRevoke set, which indicates we sent a commitment_signed but haven't gotten
2344 // the corresponding revoke_and_ack back yet.
2345 let our_next_remote_commitment_number = INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number + if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 };
2347 let resend_funding_locked = if msg.next_local_commitment_number == 1 && INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number == 1 {
2348 // We should never have to worry about MonitorUpdateFailed resending FundingLocked
2349 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2350 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2351 Some(msgs::FundingLocked {
2352 channel_id: self.channel_id(),
2353 next_per_commitment_point: next_per_commitment_point,
2357 let order = self.monitor_pending_order.clone().unwrap_or(if self.received_commitment_while_awaiting_raa {
2358 RAACommitmentOrder::CommitmentFirst
2360 RAACommitmentOrder::RevokeAndACKFirst
2363 if msg.next_local_commitment_number == our_next_remote_commitment_number {
2364 if required_revoke.is_some() {
2365 log_debug!(self, "Reconnected channel {} with only lost outbound RAA", log_bytes!(self.channel_id()));
2367 log_debug!(self, "Reconnected channel {} with no loss", log_bytes!(self.channel_id()));
2370 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) == 0 &&
2371 self.monitor_pending_order.is_none() { // monitor_pending_order indicates we're waiting on a response to a unfreeze
2372 // We're up-to-date and not waiting on a remote revoke (if we are our
2373 // channel_reestablish should result in them sending a revoke_and_ack), but we may
2374 // have received some updates while we were disconnected. Free the holding cell
2376 match self.free_holding_cell_htlcs() {
2377 Err(ChannelError::Close(msg)) => return Err(ChannelError::Close(msg)),
2378 Err(ChannelError::Ignore(_)) => panic!("Got non-channel-failing result from free_holding_cell_htlcs"),
2379 Ok(Some((commitment_update, channel_monitor))) => return Ok((resend_funding_locked, required_revoke, Some(commitment_update), Some(channel_monitor), order, shutdown_msg)),
2380 Ok(None) => return Ok((resend_funding_locked, required_revoke, None, None, order, shutdown_msg)),
2383 return Ok((resend_funding_locked, required_revoke, None, None, order, shutdown_msg));
2385 } else if msg.next_local_commitment_number == our_next_remote_commitment_number - 1 {
2386 if required_revoke.is_some() {
2387 log_debug!(self, "Reconnected channel {} with lost outbound RAA and lost remote commitment tx", log_bytes!(self.channel_id()));
2389 log_debug!(self, "Reconnected channel {} with only lost remote commitment tx", log_bytes!(self.channel_id()));
2392 // If monitor_pending_order is set, it must be CommitmentSigned if we have no RAA
2393 debug_assert!(self.monitor_pending_order != Some(RAACommitmentOrder::RevokeAndACKFirst) || required_revoke.is_some());
2395 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2396 self.monitor_pending_commitment_signed = true;
2397 return Ok((resend_funding_locked, None, None, None, order, shutdown_msg));
2400 return Ok((resend_funding_locked, required_revoke, Some(self.get_last_commitment_update()), None, order, shutdown_msg));
2402 return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old remote commitment transaction"));
2406 fn maybe_propose_first_closing_signed(&mut self, fee_estimator: &FeeEstimator) -> Option<msgs::ClosingSigned> {
2407 if !self.channel_outbound || !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() ||
2408 self.channel_state & (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32) != BOTH_SIDES_SHUTDOWN_MASK ||
2409 self.last_sent_closing_fee.is_some() ||
2410 self.cur_remote_commitment_transaction_number != self.cur_local_commitment_transaction_number{
2414 let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2415 if self.feerate_per_kw > proposed_feerate {
2416 proposed_feerate = self.feerate_per_kw;
2418 let tx_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2419 let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
2421 let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
2422 let funding_redeemscript = self.get_funding_redeemscript();
2423 let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2425 self.last_sent_closing_fee = Some((proposed_feerate, total_fee_satoshis));
2426 Some(msgs::ClosingSigned {
2427 channel_id: self.channel_id,
2428 fee_satoshis: total_fee_satoshis,
2429 signature: self.secp_ctx.sign(&sighash, &self.local_keys.funding_key),
2433 pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, [u8; 32])>), ChannelError> {
2434 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2435 return Err(ChannelError::Close("Peer sent shutdown when we needed a channel_reestablish"));
2437 if self.channel_state < ChannelState::FundingSent as u32 {
2438 // Spec says we should fail the connection, not the channel, but that's nonsense, there
2439 // are plenty of reasons you may want to fail a channel pre-funding, and spec says you
2440 // can do that via error message without getting a connection fail anyway...
2441 return Err(ChannelError::Close("Peer sent shutdown pre-funding generation"));
2443 for htlc in self.pending_inbound_htlcs.iter() {
2444 if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
2445 return Err(ChannelError::Close("Got shutdown with remote pending HTLCs"));
2448 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2450 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
2451 // 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
2452 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
2453 return Err(ChannelError::Close("Got shutdown_scriptpubkey of absurd length from remote peer"));
2456 //Check shutdown_scriptpubkey form as BOLT says we must
2457 if !msg.scriptpubkey.is_p2pkh() && !msg.scriptpubkey.is_p2sh() && !msg.scriptpubkey.is_v0_p2wpkh() && !msg.scriptpubkey.is_v0_p2wsh() {
2458 return Err(ChannelError::Close("Got a nonstandard scriptpubkey from remote peer"));
2461 if self.their_shutdown_scriptpubkey.is_some() {
2462 if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
2463 return Err(ChannelError::Close("Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey"));
2466 self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
2469 // From here on out, we may not fail!
2471 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
2472 self.channel_update_count += 1;
2474 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2475 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2476 // cell HTLCs and return them to fail the payment.
2477 self.holding_cell_update_fee = None;
2478 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2479 self.holding_cell_htlc_updates.retain(|htlc_update| {
2481 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2482 dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2488 // If we have any LocalAnnounced updates we'll probably just get back a update_fail_htlc
2489 // immediately after the commitment dance, but we can send a Shutdown cause we won't send
2490 // any further commitment updates after we set LocalShutdownSent.
2492 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
2495 Some(msgs::Shutdown {
2496 channel_id: self.channel_id,
2497 scriptpubkey: self.get_closing_scriptpubkey(),
2501 self.channel_state |= ChannelState::LocalShutdownSent as u32;
2502 self.channel_update_count += 1;
2503 Ok((our_shutdown, self.maybe_propose_first_closing_signed(fee_estimator), dropped_outbound_htlcs))
2506 pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), ChannelError> {
2507 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
2508 return Err(ChannelError::Close("Remote end sent us a closing_signed before both sides provided a shutdown"));
2510 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2511 return Err(ChannelError::Close("Peer sent closing_signed when we needed a channel_reestablish"));
2513 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
2514 return Err(ChannelError::Close("Remote end sent us a closing_signed while there were still pending HTLCs"));
2516 if msg.fee_satoshis > 21000000 * 10000000 { //this is required to stop potential overflow in build_closing_transaction
2517 return Err(ChannelError::Close("Remote tried to send us a closing tx with > 21 million BTC fee"));
2520 let funding_redeemscript = self.get_funding_redeemscript();
2521 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
2522 if used_total_fee != msg.fee_satoshis {
2523 return Err(ChannelError::Close("Remote sent us a closing_signed with a fee greater than the value they can claim"));
2525 let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2527 match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()) {
2530 // The remote end may have decided to revoke their output due to inconsistent dust
2531 // limits, so check for that case by re-checking the signature here.
2532 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
2533 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2534 secp_check!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid closing tx signature from peer");
2538 if let Some((_, last_fee)) = self.last_sent_closing_fee {
2539 if last_fee == msg.fee_satoshis {
2540 self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2541 self.channel_state = ChannelState::ShutdownComplete as u32;
2542 self.channel_update_count += 1;
2543 return Ok((None, Some(closing_tx)));
2547 macro_rules! propose_new_feerate {
2548 ($new_feerate: expr) => {
2549 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2550 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 1000, false);
2551 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2552 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
2553 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
2554 return Ok((Some(msgs::ClosingSigned {
2555 channel_id: self.channel_id,
2556 fee_satoshis: used_total_fee,
2562 let proposed_sat_per_kw = msg.fee_satoshis * 1000 / closing_tx.get_weight();
2563 if self.channel_outbound {
2564 let our_max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
2565 if proposed_sat_per_kw > our_max_feerate {
2566 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2567 if our_max_feerate <= last_feerate {
2568 return Err(ChannelError::Close("Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate"));
2571 propose_new_feerate!(our_max_feerate);
2574 let our_min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2575 if proposed_sat_per_kw < our_min_feerate {
2576 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2577 if our_min_feerate >= last_feerate {
2578 return Err(ChannelError::Close("Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate"));
2581 propose_new_feerate!(our_min_feerate);
2585 let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2586 self.channel_state = ChannelState::ShutdownComplete as u32;
2587 self.channel_update_count += 1;
2589 Ok((Some(msgs::ClosingSigned {
2590 channel_id: self.channel_id,
2591 fee_satoshis: msg.fee_satoshis,
2593 }), Some(closing_tx)))
2596 // Public utilities:
2598 pub fn channel_id(&self) -> [u8; 32] {
2602 /// Gets the "user_id" value passed into the construction of this channel. It has no special
2603 /// meaning and exists only to allow users to have a persistent identifier of a channel.
2604 pub fn get_user_id(&self) -> u64 {
2608 /// May only be called after funding has been initiated (ie is_funding_initiated() is true)
2609 pub fn channel_monitor(&self) -> ChannelMonitor {
2610 if self.channel_state < ChannelState::FundingCreated as u32 {
2611 panic!("Can't get a channel monitor until funding has been created");
2613 self.channel_monitor.clone()
2616 /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
2617 /// is_usable() returns true).
2618 /// Allowed in any state (including after shutdown)
2619 pub fn get_short_channel_id(&self) -> Option<u64> {
2620 self.short_channel_id
2623 /// Returns the funding_txo we either got from our peer, or were given by
2624 /// get_outbound_funding_created.
2625 pub fn get_funding_txo(&self) -> Option<OutPoint> {
2626 self.channel_monitor.get_funding_txo()
2629 /// Allowed in any state (including after shutdown)
2630 pub fn get_their_node_id(&self) -> PublicKey {
2634 /// Allowed in any state (including after shutdown)
2635 pub fn get_our_htlc_minimum_msat(&self) -> u64 {
2636 self.our_htlc_minimum_msat
2639 /// Allowed in any state (including after shutdown)
2640 pub fn get_their_htlc_minimum_msat(&self) -> u64 {
2641 self.our_htlc_minimum_msat
2644 pub fn get_value_satoshis(&self) -> u64 {
2645 self.channel_value_satoshis
2648 pub fn get_fee_proportional_millionths(&self) -> u32 {
2649 self.config.fee_proportional_millionths
2653 pub fn get_feerate(&self) -> u64 {
2657 pub fn get_cur_local_commitment_transaction_number(&self) -> u64 {
2658 self.cur_local_commitment_transaction_number + 1
2661 pub fn get_cur_remote_commitment_transaction_number(&self) -> u64 {
2662 self.cur_remote_commitment_transaction_number + 1 - if self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 }
2665 pub fn get_revoked_remote_commitment_transaction_number(&self) -> u64 {
2666 self.cur_remote_commitment_transaction_number + 2
2669 //TODO: Testing purpose only, should be changed in another way after #81
2671 pub fn get_local_keys(&self) -> &ChannelKeys {
2676 pub fn get_value_stat(&self) -> ChannelValueStat {
2678 value_to_self_msat: self.value_to_self_msat,
2679 channel_value_msat: self.channel_value_satoshis * 1000,
2680 channel_reserve_msat: self.their_channel_reserve_satoshis * 1000,
2681 pending_outbound_htlcs_amount_msat: self.pending_outbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
2682 pending_inbound_htlcs_amount_msat: self.pending_inbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
2683 holding_cell_outbound_amount_msat: {
2685 for h in self.holding_cell_htlc_updates.iter() {
2687 &HTLCUpdateAwaitingACK::AddHTLC{amount_msat, .. } => {
2695 their_max_htlc_value_in_flight_msat: self.their_max_htlc_value_in_flight_msat,
2699 /// Allowed in any state (including after shutdown)
2700 pub fn get_channel_update_count(&self) -> u32 {
2701 self.channel_update_count
2704 pub fn should_announce(&self) -> bool {
2705 self.config.announced_channel
2708 pub fn is_outbound(&self) -> bool {
2709 self.channel_outbound
2712 /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
2713 /// Allowed in any state (including after shutdown)
2714 pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
2715 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
2716 // output value back into a transaction with the regular channel output:
2718 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
2719 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
2721 if self.channel_outbound {
2722 // + the marginal fee increase cost to us in the commitment transaction:
2723 res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
2726 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
2727 res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
2732 /// Returns true if we've ever received a message from the remote end for this Channel
2733 pub fn have_received_message(&self) -> bool {
2734 self.channel_state > (ChannelState::OurInitSent as u32)
2737 /// Returns true if this channel is fully established and not known to be closing.
2738 /// Allowed in any state (including after shutdown)
2739 pub fn is_usable(&self) -> bool {
2740 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
2741 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
2744 /// Returns true if this channel is currently available for use. This is a superset of
2745 /// is_usable() and considers things like the channel being temporarily disabled.
2746 /// Allowed in any state (including after shutdown)
2747 pub fn is_live(&self) -> bool {
2748 self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) == 0)
2751 /// Returns true if this channel has been marked as awaiting a monitor update to move forward.
2752 /// Allowed in any state (including after shutdown)
2753 pub fn is_awaiting_monitor_update(&self) -> bool {
2754 (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0
2757 /// Returns true if funding_created was sent/received.
2758 pub fn is_funding_initiated(&self) -> bool {
2759 self.channel_state >= ChannelState::FundingCreated as u32
2762 /// Returns true if this channel is fully shut down. True here implies that no further actions
2763 /// may/will be taken on this channel, and thus this object should be freed. Any future changes
2764 /// will be handled appropriately by the chain monitor.
2765 pub fn is_shutdown(&self) -> bool {
2766 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32 {
2767 assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
2772 /// Called by channelmanager based on chain blocks being connected.
2773 /// Note that we only need to use this to detect funding_signed, anything else is handled by
2774 /// the channel_monitor.
2775 /// In case of Err, the channel may have been closed, at which point the standard requirements
2776 /// apply - no calls may be made except those explicitly stated to be allowed post-shutdown.
2777 /// Only returns an ErrorAction of DisconnectPeer, if Err.
2778 pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Result<Option<msgs::FundingLocked>, msgs::ErrorMessage> {
2779 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
2780 if header.bitcoin_hash() != self.last_block_connected {
2781 self.last_block_connected = header.bitcoin_hash();
2782 self.channel_monitor.last_block_hash = self.last_block_connected;
2783 if self.funding_tx_confirmations > 0 {
2784 self.funding_tx_confirmations += 1;
2785 if self.funding_tx_confirmations == self.minimum_depth as u64 {
2786 let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
2787 self.channel_state |= ChannelState::OurFundingLocked as u32;
2789 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
2790 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
2791 self.channel_update_count += 1;
2793 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
2794 // We got a reorg but not enough to trigger a force close, just update
2795 // funding_tx_confirmed_in and return.
2797 } else if self.channel_state < ChannelState::ChannelFunded as u32 {
2798 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
2800 // We got a reorg but not enough to trigger a force close, just update
2801 // funding_tx_confirmed_in and return.
2804 self.funding_tx_confirmed_in = Some(header.bitcoin_hash());
2806 //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
2807 //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
2808 //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
2809 //a protocol oversight, but I assume I'm just missing something.
2810 if need_commitment_update {
2811 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2812 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2813 return Ok(Some(msgs::FundingLocked {
2814 channel_id: self.channel_id,
2815 next_per_commitment_point: next_per_commitment_point,
2821 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
2822 for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
2823 if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
2824 let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
2825 if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
2826 tx.output[txo_idx].value != self.channel_value_satoshis {
2827 if self.channel_outbound {
2828 // If we generated the funding transaction and it doesn't match what it
2829 // should, the client is really broken and we should just panic and
2830 // tell them off. That said, because hash collisions happen with high
2831 // probability in fuzztarget mode, if we're fuzzing we just close the
2832 // channel and move on.
2833 #[cfg(not(feature = "fuzztarget"))]
2834 panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
2836 self.channel_state = ChannelState::ShutdownComplete as u32;
2837 self.channel_update_count += 1;
2838 return Err(msgs::ErrorMessage {
2839 channel_id: self.channel_id(),
2840 data: "funding tx had wrong script/value".to_owned()
2843 if self.channel_outbound {
2844 for input in tx.input.iter() {
2845 if input.witness.is_empty() {
2846 // We generated a malleable funding transaction, implying we've
2847 // just exposed ourselves to funds loss to our counterparty.
2848 #[cfg(not(feature = "fuzztarget"))]
2849 panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
2853 self.funding_tx_confirmations = 1;
2854 self.short_channel_id = Some(((height as u64) << (5*8)) |
2855 ((*index_in_block as u64) << (2*8)) |
2856 ((txo_idx as u64) << (0*8)));
2864 /// Called by channelmanager based on chain blocks being disconnected.
2865 /// Returns true if we need to close the channel now due to funding transaction
2866 /// unconfirmation/reorg.
2867 pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
2868 if self.funding_tx_confirmations > 0 {
2869 self.funding_tx_confirmations -= 1;
2870 if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
2874 if Some(header.bitcoin_hash()) == self.funding_tx_confirmed_in {
2875 self.funding_tx_confirmations = self.minimum_depth as u64 - 1;
2877 self.last_block_connected = header.bitcoin_hash();
2878 self.channel_monitor.last_block_hash = self.last_block_connected;
2882 // Methods to get unprompted messages to send to the remote end (or where we already returned
2883 // something in the handler for the message that prompted this message):
2885 pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> msgs::OpenChannel {
2886 if !self.channel_outbound {
2887 panic!("Tried to open a channel for an inbound channel?");
2889 if self.channel_state != ChannelState::OurInitSent as u32 {
2890 panic!("Cannot generate an open_channel after we've moved forward");
2893 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2894 panic!("Tried to send an open_channel for a channel that has already advanced");
2897 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2900 chain_hash: chain_hash,
2901 temporary_channel_id: self.channel_id,
2902 funding_satoshis: self.channel_value_satoshis,
2903 push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
2904 dust_limit_satoshis: self.our_dust_limit_satoshis,
2905 max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2906 channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2907 htlc_minimum_msat: self.our_htlc_minimum_msat,
2908 feerate_per_kw: fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) as u32,
2909 to_self_delay: BREAKDOWN_TIMEOUT,
2910 max_accepted_htlcs: OUR_MAX_HTLCS,
2911 funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2912 revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2913 payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2914 delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2915 htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2916 first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2917 channel_flags: if self.config.announced_channel {1} else {0},
2918 shutdown_scriptpubkey: None,
2922 pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
2923 if self.channel_outbound {
2924 panic!("Tried to send accept_channel for an outbound channel?");
2926 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
2927 panic!("Tried to send accept_channel after channel had moved forward");
2929 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2930 panic!("Tried to send an accept_channel for a channel that has already advanced");
2933 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2935 msgs::AcceptChannel {
2936 temporary_channel_id: self.channel_id,
2937 dust_limit_satoshis: self.our_dust_limit_satoshis,
2938 max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2939 channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2940 htlc_minimum_msat: self.our_htlc_minimum_msat,
2941 minimum_depth: self.minimum_depth,
2942 to_self_delay: BREAKDOWN_TIMEOUT,
2943 max_accepted_htlcs: OUR_MAX_HTLCS,
2944 funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2945 revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2946 payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2947 delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2948 htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2949 first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2950 shutdown_scriptpubkey: None,
2954 /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
2955 fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), ChannelError> {
2956 let funding_script = self.get_funding_redeemscript();
2958 let remote_keys = self.build_remote_transaction_keys()?;
2959 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
2960 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
2962 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
2963 Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key), remote_initial_commitment_tx))
2966 /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
2967 /// a funding_created message for the remote peer.
2968 /// Panics if called at some time other than immediately after initial handshake, if called twice,
2969 /// or if called on an inbound channel.
2970 /// Note that channel_id changes during this call!
2971 /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
2972 /// If an Err is returned, it is a ChannelError::Close.
2973 pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), ChannelError> {
2974 if !self.channel_outbound {
2975 panic!("Tried to create outbound funding_created message on an inbound channel!");
2977 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
2978 panic!("Tried to get a funding_created messsage at a time other than immediately after initial handshake completion (or tried to get funding_created twice)");
2980 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
2981 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
2982 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2983 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
2986 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
2987 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
2989 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
2992 log_error!(self, "Got bad signatures: {:?}!", e);
2993 self.channel_monitor.unset_funding_info();
2998 let temporary_channel_id = self.channel_id;
3000 // Now that we're past error-generating stuff, update our local state:
3001 self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number, self.their_cur_commitment_point.unwrap());
3002 self.channel_state = ChannelState::FundingCreated as u32;
3003 self.channel_id = funding_txo.to_channel_id();
3004 self.cur_remote_commitment_transaction_number -= 1;
3006 Ok((msgs::FundingCreated {
3007 temporary_channel_id: temporary_channel_id,
3008 funding_txid: funding_txo.txid,
3009 funding_output_index: funding_txo.index,
3010 signature: our_signature
3011 }, self.channel_monitor.clone()))
3014 /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
3015 /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
3016 /// available for use (have exchanged FundingLocked messages in both directions). Should be used
3017 /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
3018 /// Will only fail if we're not in a state where channel_announcement may be sent (including
3020 /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
3021 /// https://github.com/lightningnetwork/lightning-rfc/issues/468
3022 pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
3023 if !self.config.announced_channel {
3024 return Err(ChannelError::Ignore("Channel is not available for public announcements"));
3026 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
3027 return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement until the channel funding has been locked"));
3029 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
3030 return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement once the channel is closing"));
3033 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
3034 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key);
3036 let msg = msgs::UnsignedChannelAnnouncement {
3037 features: msgs::GlobalFeatures::new(),
3038 chain_hash: chain_hash,
3039 short_channel_id: self.get_short_channel_id().unwrap(),
3040 node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
3041 node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
3042 bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey.unwrap() },
3043 bitcoin_key_2: if were_node_one { self.their_funding_pubkey.unwrap() } else { our_bitcoin_key },
3044 excess_data: Vec::new(),
3047 let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
3048 let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key);
3053 /// May panic if called on a channel that wasn't immediately-previously
3054 /// self.remove_uncommitted_htlcs_and_mark_paused()'d
3055 pub fn get_channel_reestablish(&self) -> msgs::ChannelReestablish {
3056 assert_eq!(self.channel_state & ChannelState::PeerDisconnected as u32, ChannelState::PeerDisconnected as u32);
3057 assert_ne!(self.cur_remote_commitment_transaction_number, INITIAL_COMMITMENT_NUMBER);
3058 msgs::ChannelReestablish {
3059 channel_id: self.channel_id(),
3060 // The protocol has two different commitment number concepts - the "commitment
3061 // transaction number", which starts from 0 and counts up, and the "revocation key
3062 // index" which starts at INITIAL_COMMITMENT_NUMBER and counts down. We track
3063 // commitment transaction numbers by the index which will be used to reveal the
3064 // revocation key for that commitment transaction, which means we have to convert them
3065 // to protocol-level commitment numbers here...
3067 // next_local_commitment_number is the next commitment_signed number we expect to
3068 // receive (indicating if they need to resend one that we missed).
3069 next_local_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number,
3070 // We have to set next_remote_commitment_number to the next revoke_and_ack we expect to
3071 // receive, however we track it by the next commitment number for a remote transaction
3072 // (which is one further, as they always revoke previous commitment transaction, not
3073 // the one we send) so we have to decrement by 1. Note that if
3074 // cur_remote_commitment_transaction_number is INITIAL_COMMITMENT_NUMBER we will have
3075 // dropped this channel on disconnect as it hasn't yet reached FundingSent so we can't
3077 next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number - 1,
3078 data_loss_protect: None,
3083 // Send stuff to our remote peers:
3085 /// Adds a pending outbound HTLC to this channel, note that you probably want
3086 /// send_htlc_and_commit instead cause you'll want both messages at once.
3087 /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
3088 /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
3089 /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
3090 /// You MUST call send_commitment prior to any other calls on this Channel
3091 pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> {
3092 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
3093 return Err(ChannelError::Ignore("Cannot send HTLC until channel is fully established and we haven't started shutting down"));
3096 if amount_msat > self.channel_value_satoshis * 1000 {
3097 return Err(ChannelError::Ignore("Cannot send more than the total value of the channel"));
3099 if amount_msat < self.their_htlc_minimum_msat {
3100 return Err(ChannelError::Ignore("Cannot send less than their minimum HTLC value"));
3103 if (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
3104 // Note that this should never really happen, if we're !is_live() on receipt of an
3105 // incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
3106 // the user to send directly into a !is_live() channel. However, if we
3107 // disconnected during the time the previous hop was doing the commitment dance we may
3108 // end up getting here after the forwarding delay. In any case, returning an
3109 // IgnoreError will get ChannelManager to do the right thing and fail backwards now.
3110 return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected/frozen for channel monitor update"));
3113 let (outbound_htlc_count, htlc_outbound_value_msat) = self.get_outbound_pending_htlc_stats();
3114 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
3115 return Err(ChannelError::Ignore("Cannot push more than their max accepted HTLCs"));
3117 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
3118 // Check their_max_htlc_value_in_flight_msat
3119 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
3120 return Err(ChannelError::Ignore("Cannot send value that would put us over our max HTLC value in flight"));
3123 let mut holding_cell_outbound_amount_msat = 0;
3124 for holding_htlc in self.holding_cell_htlc_updates.iter() {
3125 match holding_htlc {
3126 &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, .. } => {
3127 holding_cell_outbound_amount_msat += *amount_msat;
3133 // Check self.their_channel_reserve_satoshis (the amount we must keep as
3134 // reserve for them to have something to claim if we misbehave)
3135 if self.value_to_self_msat < self.their_channel_reserve_satoshis * 1000 + amount_msat + holding_cell_outbound_amount_msat + htlc_outbound_value_msat {
3136 return Err(ChannelError::Ignore("Cannot send value that would put us over our reserve value"));
3139 //TODO: Check cltv_expiry? Do this in channel manager?
3141 // Now update local state:
3142 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3143 //TODO: Check the limits *including* other pending holding cell HTLCs!
3144 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
3145 amount_msat: amount_msat,
3146 payment_hash: payment_hash,
3147 cltv_expiry: cltv_expiry,
3149 onion_routing_packet: onion_routing_packet,
3150 time_created: Instant::now(),
3155 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
3156 htlc_id: self.next_local_htlc_id,
3157 amount_msat: amount_msat,
3158 payment_hash: payment_hash.clone(),
3159 cltv_expiry: cltv_expiry,
3160 state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
3165 let res = msgs::UpdateAddHTLC {
3166 channel_id: self.channel_id,
3167 htlc_id: self.next_local_htlc_id,
3168 amount_msat: amount_msat,
3169 payment_hash: payment_hash,
3170 cltv_expiry: cltv_expiry,
3171 onion_routing_packet: onion_routing_packet,
3173 self.next_local_htlc_id += 1;
3178 /// Creates a signed commitment transaction to send to the remote peer.
3179 /// Always returns a ChannelError::Close if an immediately-preceding (read: the
3180 /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
3181 /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
3182 pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), ChannelError> {
3183 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
3184 panic!("Cannot create commitment tx until channel is fully established");
3186 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3187 panic!("Cannot create commitment tx until remote revokes their previous commitment");
3189 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
3190 panic!("Cannot create commitment tx while disconnected, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3192 if (self.channel_state & (ChannelState::MonitorUpdateFailed as u32)) == (ChannelState::MonitorUpdateFailed as u32) {
3193 panic!("Cannot create commitment tx while awaiting monitor update unfreeze, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3195 let mut have_updates = self.pending_update_fee.is_some();
3196 for htlc in self.pending_outbound_htlcs.iter() {
3197 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3198 have_updates = true;
3200 if have_updates { break; }
3203 panic!("Cannot create commitment tx until we have some updates to send");
3205 self.send_commitment_no_status_check()
3207 /// Only fails in case of bad keys
3208 fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), ChannelError> {
3209 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
3210 // fail to generate this, we still are at least at a position where upgrading their status
3212 for htlc in self.pending_inbound_htlcs.iter_mut() {
3213 let new_state = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref forward_info) = &htlc.state {
3214 Some(InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info.clone()))
3216 if let Some(state) = new_state {
3220 for htlc in self.pending_outbound_htlcs.iter_mut() {
3221 if let OutboundHTLCState::AwaitingRemoteRevokeToRemove = htlc.state {
3222 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
3226 match self.send_commitment_no_state_update() {
3227 Ok((res, remote_commitment_tx)) => {
3228 // Update state now that we've passed all the can-fail calls...
3229 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number, self.their_cur_commitment_point.unwrap());
3230 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
3231 Ok((res, self.channel_monitor.clone()))
3237 /// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
3238 /// when we shouldn't change HTLC/channel state.
3239 fn send_commitment_no_state_update(&self) -> Result<(msgs::CommitmentSigned, (Transaction, Vec<HTLCOutputInCommitment>)), ChannelError> {
3240 let funding_script = self.get_funding_redeemscript();
3242 let mut feerate_per_kw = self.feerate_per_kw;
3243 if let Some(feerate) = self.pending_update_fee {
3244 if self.channel_outbound {
3245 feerate_per_kw = feerate;
3249 let remote_keys = self.build_remote_transaction_keys()?;
3250 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true, feerate_per_kw);
3251 let remote_commitment_txid = remote_commitment_tx.0.txid();
3252 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_commitment_tx.0).sighash_all(&remote_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
3253 let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key);
3255 let mut htlc_sigs = Vec::new();
3257 for ref htlc in remote_commitment_tx.1.iter() {
3258 let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys, feerate_per_kw);
3259 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
3260 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
3261 let our_htlc_key = secp_check!(chan_utils::derive_private_key(&self.secp_ctx, &remote_keys.per_commitment_point, &self.local_keys.htlc_base_key), "Derived invalid key, peer is maliciously selecting parameters");
3262 htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key));
3265 Ok((msgs::CommitmentSigned {
3266 channel_id: self.channel_id,
3268 htlc_signatures: htlc_sigs,
3269 }, remote_commitment_tx))
3272 /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
3273 /// to send to the remote peer in one go.
3274 /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
3276 pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, ChannelError> {
3277 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet)? {
3278 Some(update_add_htlc) => {
3279 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
3280 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
3286 /// Begins the shutdown process, getting a message for the remote peer and returning all
3287 /// holding cell HTLCs for payment failure.
3288 pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, [u8; 32])>), APIError> {
3289 for htlc in self.pending_outbound_htlcs.iter() {
3290 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3291 return Err(APIError::APIMisuseError{err: "Cannot begin shutdown with pending HTLCs. Process pending events first"});
3294 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
3295 if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
3296 return Err(APIError::APIMisuseError{err: "Shutdown already in progress"});
3298 else if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
3299 return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote"});
3302 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
3303 if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) != 0 {
3304 return Err(APIError::ChannelUnavailable{err: "Cannot begin shutdown while peer is disconnected or we're waiting on a monitor update, maybe force-close instead?"});
3307 let our_closing_script = self.get_closing_scriptpubkey();
3309 // From here on out, we may not fail!
3310 if self.channel_state < ChannelState::FundingSent as u32 {
3311 self.channel_state = ChannelState::ShutdownComplete as u32;
3313 self.channel_state |= ChannelState::LocalShutdownSent as u32;
3315 self.channel_update_count += 1;
3317 // Go ahead and drop holding cell updates as we'd rather fail payments than wait to send
3318 // our shutdown until we've committed all of the pending changes.
3319 self.holding_cell_update_fee = None;
3320 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3321 self.holding_cell_htlc_updates.retain(|htlc_update| {
3323 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
3324 dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
3331 Ok((msgs::Shutdown {
3332 channel_id: self.channel_id,
3333 scriptpubkey: our_closing_script,
3334 }, dropped_outbound_htlcs))
3337 /// Gets the latest commitment transaction and any dependant transactions for relay (forcing
3338 /// shutdown of this channel - no more calls into this Channel may be made afterwards except
3339 /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
3340 /// Also returns the list of payment_hashes for channels which we can safely fail backwards
3341 /// immediately (others we will have to allow to time out).
3342 pub fn force_shutdown(&mut self) -> (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>) {
3343 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
3345 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
3346 // return them to fail the payment.
3347 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3348 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
3350 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
3351 dropped_outbound_htlcs.push((source, payment_hash));
3357 for _htlc in self.pending_outbound_htlcs.drain(..) {
3358 //TODO: Do something with the remaining HTLCs
3359 //(we need to have the ChannelManager monitor them so we can claim the inbound HTLCs
3363 self.channel_state = ChannelState::ShutdownComplete as u32;
3364 self.channel_update_count += 1;
3365 let mut res = Vec::new();
3366 mem::swap(&mut res, &mut self.last_local_commitment_txn);
3367 (res, dropped_outbound_htlcs)
3371 const SERIALIZATION_VERSION: u8 = 1;
3372 const MIN_SERIALIZATION_VERSION: u8 = 1;
3374 impl Writeable for InboundHTLCRemovalReason {
3375 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3377 &InboundHTLCRemovalReason::FailRelay(ref error_packet) => {
3379 error_packet.write(writer)?;
3381 &InboundHTLCRemovalReason::FailMalformed((ref onion_hash, ref err_code)) => {
3383 onion_hash.write(writer)?;
3384 err_code.write(writer)?;
3386 &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
3388 payment_preimage.write(writer)?;
3395 impl<R: ::std::io::Read> Readable<R> for InboundHTLCRemovalReason {
3396 fn read(reader: &mut R) -> Result<Self, DecodeError> {
3397 Ok(match <u8 as Readable<R>>::read(reader)? {
3398 0 => InboundHTLCRemovalReason::FailRelay(Readable::read(reader)?),
3399 1 => InboundHTLCRemovalReason::FailMalformed((Readable::read(reader)?, Readable::read(reader)?)),
3400 2 => InboundHTLCRemovalReason::Fulfill(Readable::read(reader)?),
3401 _ => return Err(DecodeError::InvalidValue),
3406 impl Writeable for Channel {
3407 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3408 // Note that we write out as if remove_uncommitted_htlcs_and_mark_paused had just been
3409 // called but include holding cell updates (and obviously we don't modify self).
3411 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
3412 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
3414 self.user_id.write(writer)?;
3415 self.config.write(writer)?;
3417 self.channel_id.write(writer)?;
3418 (self.channel_state | ChannelState::PeerDisconnected as u32).write(writer)?;
3419 self.channel_outbound.write(writer)?;
3420 self.channel_value_satoshis.write(writer)?;
3422 self.local_keys.write(writer)?;
3423 self.shutdown_pubkey.write(writer)?;
3425 self.cur_local_commitment_transaction_number.write(writer)?;
3426 self.cur_remote_commitment_transaction_number.write(writer)?;
3427 self.value_to_self_msat.write(writer)?;
3429 self.received_commitment_while_awaiting_raa.write(writer)?;
3431 let mut dropped_inbound_htlcs = 0;
3432 for htlc in self.pending_inbound_htlcs.iter() {
3433 if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
3434 dropped_inbound_htlcs += 1;
3437 (self.pending_inbound_htlcs.len() as u64 - dropped_inbound_htlcs).write(writer)?;
3438 for htlc in self.pending_inbound_htlcs.iter() {
3439 htlc.htlc_id.write(writer)?;
3440 htlc.amount_msat.write(writer)?;
3441 htlc.cltv_expiry.write(writer)?;
3442 htlc.payment_hash.write(writer)?;
3444 &InboundHTLCState::RemoteAnnounced(_) => {}, // Drop
3445 &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref htlc_state) => {
3447 htlc_state.write(writer)?;
3449 &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(ref htlc_state) => {
3451 htlc_state.write(writer)?;
3453 &InboundHTLCState::Committed => {
3456 &InboundHTLCState::LocalRemoved(ref removal_reason) => {
3458 removal_reason.write(writer)?;
3463 macro_rules! write_option {
3466 &None => 0u8.write(writer)?,
3475 (self.pending_outbound_htlcs.len() as u64).write(writer)?;
3476 for htlc in self.pending_outbound_htlcs.iter() {
3477 htlc.htlc_id.write(writer)?;
3478 htlc.amount_msat.write(writer)?;
3479 htlc.cltv_expiry.write(writer)?;
3480 htlc.payment_hash.write(writer)?;
3481 htlc.source.write(writer)?;
3482 write_option!(htlc.fail_reason);
3484 &OutboundHTLCState::LocalAnnounced(ref onion_packet) => {
3486 onion_packet.write(writer)?;
3488 &OutboundHTLCState::Committed => {
3491 &OutboundHTLCState::RemoteRemoved => {
3494 &OutboundHTLCState::AwaitingRemoteRevokeToRemove => {
3497 &OutboundHTLCState::AwaitingRemovedRemoteRevoke => {
3503 (self.holding_cell_htlc_updates.len() as u64).write(writer)?;
3504 for update in self.holding_cell_htlc_updates.iter() {
3506 &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet, time_created: _ } => {
3508 amount_msat.write(writer)?;
3509 cltv_expiry.write(writer)?;
3510 payment_hash.write(writer)?;
3511 source.write(writer)?;
3512 onion_routing_packet.write(writer)?;
3513 // time_created is not serialized - we re-init the timeout upon deserialization
3515 &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, ref htlc_id } => {
3517 payment_preimage.write(writer)?;
3518 htlc_id.write(writer)?;
3520 &HTLCUpdateAwaitingACK::FailHTLC { ref htlc_id, ref err_packet } => {
3522 htlc_id.write(writer)?;
3523 err_packet.write(writer)?;
3528 self.monitor_pending_revoke_and_ack.write(writer)?;
3529 self.monitor_pending_commitment_signed.write(writer)?;
3530 match self.monitor_pending_order {
3531 None => 0u8.write(writer)?,
3532 Some(RAACommitmentOrder::CommitmentFirst) => 1u8.write(writer)?,
3533 Some(RAACommitmentOrder::RevokeAndACKFirst) => 2u8.write(writer)?,
3536 (self.monitor_pending_forwards.len() as u64).write(writer)?;
3537 for &(ref pending_forward, ref htlc_id) in self.monitor_pending_forwards.iter() {
3538 pending_forward.write(writer)?;
3539 htlc_id.write(writer)?;
3542 (self.monitor_pending_failures.len() as u64).write(writer)?;
3543 for &(ref htlc_source, ref payment_hash, ref fail_reason) in self.monitor_pending_failures.iter() {
3544 htlc_source.write(writer)?;
3545 payment_hash.write(writer)?;
3546 fail_reason.write(writer)?;
3549 write_option!(self.pending_update_fee);
3550 write_option!(self.holding_cell_update_fee);
3552 self.next_local_htlc_id.write(writer)?;
3553 (self.next_remote_htlc_id - dropped_inbound_htlcs).write(writer)?;
3554 self.channel_update_count.write(writer)?;
3555 self.feerate_per_kw.write(writer)?;
3557 (self.last_local_commitment_txn.len() as u64).write(writer)?;
3558 for tx in self.last_local_commitment_txn.iter() {
3559 if let Err(e) = tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
3561 encode::Error::Io(e) => return Err(e),
3562 _ => panic!("last_local_commitment_txn must have been well-formed!"),
3567 match self.last_sent_closing_fee {
3568 Some((feerate, fee)) => {
3570 feerate.write(writer)?;
3573 None => 0u8.write(writer)?,
3576 write_option!(self.funding_tx_confirmed_in);
3577 write_option!(self.short_channel_id);
3579 self.last_block_connected.write(writer)?;
3580 self.funding_tx_confirmations.write(writer)?;
3582 self.their_dust_limit_satoshis.write(writer)?;
3583 self.our_dust_limit_satoshis.write(writer)?;
3584 self.their_max_htlc_value_in_flight_msat.write(writer)?;
3585 self.their_channel_reserve_satoshis.write(writer)?;
3586 self.their_htlc_minimum_msat.write(writer)?;
3587 self.our_htlc_minimum_msat.write(writer)?;
3588 self.their_to_self_delay.write(writer)?;
3589 self.their_max_accepted_htlcs.write(writer)?;
3590 self.minimum_depth.write(writer)?;
3592 write_option!(self.their_funding_pubkey);
3593 write_option!(self.their_revocation_basepoint);
3594 write_option!(self.their_payment_basepoint);
3595 write_option!(self.their_delayed_payment_basepoint);
3596 write_option!(self.their_htlc_basepoint);
3597 write_option!(self.their_cur_commitment_point);
3599 write_option!(self.their_prev_commitment_point);
3600 self.their_node_id.write(writer)?;
3602 write_option!(self.their_shutdown_scriptpubkey);
3604 self.channel_monitor.write_for_disk(writer)?;
3609 impl<R : ::std::io::Read> ReadableArgs<R, Arc<Logger>> for Channel {
3610 fn read(reader: &mut R, logger: Arc<Logger>) -> Result<Self, DecodeError> {
3611 let _ver: u8 = Readable::read(reader)?;
3612 let min_ver: u8 = Readable::read(reader)?;
3613 if min_ver > SERIALIZATION_VERSION {
3614 return Err(DecodeError::UnknownVersion);
3617 let user_id = Readable::read(reader)?;
3618 let config: ChannelConfig = Readable::read(reader)?;
3620 let channel_id = Readable::read(reader)?;
3621 let channel_state = Readable::read(reader)?;
3622 let channel_outbound = Readable::read(reader)?;
3623 let channel_value_satoshis = Readable::read(reader)?;
3625 let local_keys = Readable::read(reader)?;
3626 let shutdown_pubkey = Readable::read(reader)?;
3628 let cur_local_commitment_transaction_number = Readable::read(reader)?;
3629 let cur_remote_commitment_transaction_number = Readable::read(reader)?;
3630 let value_to_self_msat = Readable::read(reader)?;
3632 let received_commitment_while_awaiting_raa = Readable::read(reader)?;
3634 let pending_inbound_htlc_count: u64 = Readable::read(reader)?;
3635 let mut pending_inbound_htlcs = Vec::with_capacity(cmp::min(pending_inbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
3636 for _ in 0..pending_inbound_htlc_count {
3637 pending_inbound_htlcs.push(InboundHTLCOutput {
3638 htlc_id: Readable::read(reader)?,
3639 amount_msat: Readable::read(reader)?,
3640 cltv_expiry: Readable::read(reader)?,
3641 payment_hash: Readable::read(reader)?,
3642 state: match <u8 as Readable<R>>::read(reader)? {
3643 1 => InboundHTLCState::AwaitingRemoteRevokeToAnnounce(Readable::read(reader)?),
3644 2 => InboundHTLCState::AwaitingAnnouncedRemoteRevoke(Readable::read(reader)?),
3645 3 => InboundHTLCState::Committed,
3646 4 => InboundHTLCState::LocalRemoved(Readable::read(reader)?),
3647 _ => return Err(DecodeError::InvalidValue),
3652 macro_rules! read_option { () => {
3653 match <u8 as Readable<R>>::read(reader)? {
3655 1 => Some(Readable::read(reader)?),
3656 _ => return Err(DecodeError::InvalidValue),
3660 let pending_outbound_htlc_count: u64 = Readable::read(reader)?;
3661 let mut pending_outbound_htlcs = Vec::with_capacity(cmp::min(pending_outbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
3662 for _ in 0..pending_outbound_htlc_count {
3663 pending_outbound_htlcs.push(OutboundHTLCOutput {
3664 htlc_id: Readable::read(reader)?,
3665 amount_msat: Readable::read(reader)?,
3666 cltv_expiry: Readable::read(reader)?,
3667 payment_hash: Readable::read(reader)?,
3668 source: Readable::read(reader)?,
3669 fail_reason: read_option!(),
3670 state: match <u8 as Readable<R>>::read(reader)? {
3671 0 => OutboundHTLCState::LocalAnnounced(Box::new(Readable::read(reader)?)),
3672 1 => OutboundHTLCState::Committed,
3673 2 => OutboundHTLCState::RemoteRemoved,
3674 3 => OutboundHTLCState::AwaitingRemoteRevokeToRemove,
3675 4 => OutboundHTLCState::AwaitingRemovedRemoteRevoke,
3676 _ => return Err(DecodeError::InvalidValue),
3681 let holding_cell_htlc_update_count: u64 = Readable::read(reader)?;
3682 let mut holding_cell_htlc_updates = Vec::with_capacity(cmp::min(holding_cell_htlc_update_count as usize, OUR_MAX_HTLCS as usize*2));
3683 for _ in 0..holding_cell_htlc_update_count {
3684 holding_cell_htlc_updates.push(match <u8 as Readable<R>>::read(reader)? {
3685 0 => HTLCUpdateAwaitingACK::AddHTLC {
3686 amount_msat: Readable::read(reader)?,
3687 cltv_expiry: Readable::read(reader)?,
3688 payment_hash: Readable::read(reader)?,
3689 source: Readable::read(reader)?,
3690 onion_routing_packet: Readable::read(reader)?,
3691 time_created: Instant::now(),
3693 1 => HTLCUpdateAwaitingACK::ClaimHTLC {
3694 payment_preimage: Readable::read(reader)?,
3695 htlc_id: Readable::read(reader)?,
3697 2 => HTLCUpdateAwaitingACK::FailHTLC {
3698 htlc_id: Readable::read(reader)?,
3699 err_packet: Readable::read(reader)?,
3701 _ => return Err(DecodeError::InvalidValue),
3705 let monitor_pending_revoke_and_ack = Readable::read(reader)?;
3706 let monitor_pending_commitment_signed = Readable::read(reader)?;
3708 let monitor_pending_order = match <u8 as Readable<R>>::read(reader)? {
3710 1 => Some(RAACommitmentOrder::CommitmentFirst),
3711 2 => Some(RAACommitmentOrder::RevokeAndACKFirst),
3712 _ => return Err(DecodeError::InvalidValue),
3715 let monitor_pending_forwards_count: u64 = Readable::read(reader)?;
3716 let mut monitor_pending_forwards = Vec::with_capacity(cmp::min(monitor_pending_forwards_count as usize, OUR_MAX_HTLCS as usize));
3717 for _ in 0..monitor_pending_forwards_count {
3718 monitor_pending_forwards.push((Readable::read(reader)?, Readable::read(reader)?));
3721 let monitor_pending_failures_count: u64 = Readable::read(reader)?;
3722 let mut monitor_pending_failures = Vec::with_capacity(cmp::min(monitor_pending_failures_count as usize, OUR_MAX_HTLCS as usize));
3723 for _ in 0..monitor_pending_failures_count {
3724 monitor_pending_failures.push((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?));
3727 let pending_update_fee = read_option!();
3728 let holding_cell_update_fee = read_option!();
3730 let next_local_htlc_id = Readable::read(reader)?;
3731 let next_remote_htlc_id = Readable::read(reader)?;
3732 let channel_update_count = Readable::read(reader)?;
3733 let feerate_per_kw = Readable::read(reader)?;
3735 let last_local_commitment_txn_count: u64 = Readable::read(reader)?;
3736 let mut last_local_commitment_txn = Vec::with_capacity(cmp::min(last_local_commitment_txn_count as usize, OUR_MAX_HTLCS as usize*2 + 1));
3737 for _ in 0..last_local_commitment_txn_count {
3738 last_local_commitment_txn.push(match Transaction::consensus_decode(reader.by_ref()) {
3740 Err(_) => return Err(DecodeError::InvalidValue),
3744 let last_sent_closing_fee = match <u8 as Readable<R>>::read(reader)? {
3746 1 => Some((Readable::read(reader)?, Readable::read(reader)?)),
3747 _ => return Err(DecodeError::InvalidValue),
3750 let funding_tx_confirmed_in = read_option!();
3751 let short_channel_id = read_option!();
3753 let last_block_connected = Readable::read(reader)?;
3754 let funding_tx_confirmations = Readable::read(reader)?;
3756 let their_dust_limit_satoshis = Readable::read(reader)?;
3757 let our_dust_limit_satoshis = Readable::read(reader)?;
3758 let their_max_htlc_value_in_flight_msat = Readable::read(reader)?;
3759 let their_channel_reserve_satoshis = Readable::read(reader)?;
3760 let their_htlc_minimum_msat = Readable::read(reader)?;
3761 let our_htlc_minimum_msat = Readable::read(reader)?;
3762 let their_to_self_delay = Readable::read(reader)?;
3763 let their_max_accepted_htlcs = Readable::read(reader)?;
3764 let minimum_depth = Readable::read(reader)?;
3766 let their_funding_pubkey = read_option!();
3767 let their_revocation_basepoint = read_option!();
3768 let their_payment_basepoint = read_option!();
3769 let their_delayed_payment_basepoint = read_option!();
3770 let their_htlc_basepoint = read_option!();
3771 let their_cur_commitment_point = read_option!();
3773 let their_prev_commitment_point = read_option!();
3774 let their_node_id = Readable::read(reader)?;
3776 let their_shutdown_scriptpubkey = read_option!();
3777 let (monitor_last_block, channel_monitor) = ReadableArgs::read(reader, logger.clone())?;
3778 // We drop the ChannelMonitor's last block connected hash cause we don't actually bother
3779 // doing full block connection operations on the internal CHannelMonitor copies
3780 if monitor_last_block != last_block_connected {
3781 return Err(DecodeError::InvalidValue);
3791 secp_ctx: Secp256k1::new(),
3792 channel_value_satoshis,
3797 cur_local_commitment_transaction_number,
3798 cur_remote_commitment_transaction_number,
3801 received_commitment_while_awaiting_raa,
3802 pending_inbound_htlcs,
3803 pending_outbound_htlcs,
3804 holding_cell_htlc_updates,
3806 monitor_pending_revoke_and_ack,
3807 monitor_pending_commitment_signed,
3808 monitor_pending_order,
3809 monitor_pending_forwards,
3810 monitor_pending_failures,
3813 holding_cell_update_fee,
3815 next_remote_htlc_id,
3816 channel_update_count,
3819 #[cfg(debug_assertions)]
3820 max_commitment_tx_output_local: ::std::sync::Mutex::new((0, 0)),
3821 #[cfg(debug_assertions)]
3822 max_commitment_tx_output_remote: ::std::sync::Mutex::new((0, 0)),
3824 last_local_commitment_txn,
3826 last_sent_closing_fee,
3828 funding_tx_confirmed_in,
3830 last_block_connected,
3831 funding_tx_confirmations,
3833 their_dust_limit_satoshis,
3834 our_dust_limit_satoshis,
3835 their_max_htlc_value_in_flight_msat,
3836 their_channel_reserve_satoshis,
3837 their_htlc_minimum_msat,
3838 our_htlc_minimum_msat,
3839 their_to_self_delay,
3840 their_max_accepted_htlcs,
3843 their_funding_pubkey,
3844 their_revocation_basepoint,
3845 their_payment_basepoint,
3846 their_delayed_payment_basepoint,
3847 their_htlc_basepoint,
3848 their_cur_commitment_point,
3850 their_prev_commitment_point,
3853 their_shutdown_scriptpubkey,
3864 use bitcoin::util::hash::{Sha256dHash, Hash160};
3865 use bitcoin::util::bip143;
3866 use bitcoin::consensus::encode::serialize;
3867 use bitcoin::blockdata::script::{Script, Builder};
3868 use bitcoin::blockdata::transaction::Transaction;
3869 use bitcoin::blockdata::opcodes;
3871 use ln::channelmanager::HTLCSource;
3872 use ln::channel::{Channel,ChannelKeys,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,TxCreationKeys};
3873 use ln::channel::MAX_FUNDING_SATOSHIS;
3875 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
3876 use chain::keysinterface::KeysInterface;
3877 use chain::transaction::OutPoint;
3878 use util::config::UserConfig;
3879 use util::test_utils;
3880 use util::logger::Logger;
3881 use secp256k1::{Secp256k1,Message,Signature};
3882 use secp256k1::key::{SecretKey,PublicKey};
3883 use crypto::sha2::Sha256;
3884 use crypto::digest::Digest;
3887 struct TestFeeEstimator {
3890 impl FeeEstimator for TestFeeEstimator {
3891 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
3897 fn test_max_funding_satoshis() {
3898 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
3899 "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
3903 chan_keys: ChannelKeys,
3905 impl KeysInterface for Keys {
3906 fn get_node_secret(&self) -> SecretKey { panic!(); }
3907 fn get_destination_script(&self) -> Script {
3908 let secp_ctx = Secp256k1::signing_only();
3909 let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
3910 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
3911 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
3914 fn get_shutdown_pubkey(&self) -> PublicKey {
3915 let secp_ctx = Secp256k1::signing_only();
3916 let channel_close_key = SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
3917 PublicKey::from_secret_key(&secp_ctx, &channel_close_key)
3920 fn get_channel_keys(&self, _inbound: bool) -> ChannelKeys { self.chan_keys.clone() }
3921 fn get_session_key(&self) -> SecretKey { panic!(); }
3925 fn outbound_commitment_test() {
3926 // Test vectors from BOLT 3 Appendix C:
3927 let feeest = TestFeeEstimator{fee_est: 15000};
3928 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
3929 let secp_ctx = Secp256k1::new();
3931 let chan_keys = ChannelKeys {
3932 funding_key: SecretKey::from_slice(&secp_ctx, &hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
3933 payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
3934 delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
3935 htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
3937 // These aren't set in the test vectors:
3938 revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
3939 commitment_seed: [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
3941 assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).serialize()[..],
3942 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
3943 let keys_provider: Arc<KeysInterface> = Arc::new(Keys { chan_keys });
3945 let their_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
3946 let mut config = UserConfig::new();
3947 config.channel_options.announced_channel = false;
3948 let mut chan = Channel::new_outbound(&feeest, &keys_provider, their_node_id, 10000000, 100000, 42, Arc::clone(&logger), &config).unwrap(); // Nothing uses their network key in this test
3949 chan.their_to_self_delay = 144;
3950 chan.our_dust_limit_satoshis = 546;
3952 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
3953 chan.channel_monitor.set_funding_info((funding_info, Script::new()));
3955 chan.their_payment_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
3956 assert_eq!(chan.their_payment_basepoint.unwrap().serialize()[..],
3957 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
3959 chan.their_funding_pubkey = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()));
3960 assert_eq!(chan.their_funding_pubkey.unwrap().serialize()[..],
3961 hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
3963 chan.their_htlc_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
3964 assert_eq!(chan.their_htlc_basepoint.unwrap().serialize()[..],
3965 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
3967 chan.their_revocation_basepoint = Some(PublicKey::from_slice(&secp_ctx, &hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap());
3969 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
3970 // derived from a commitment_seed, so instead we copy it here and call
3971 // build_commitment_transaction.
3972 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key);
3973 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
3974 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
3975 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key);
3976 let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &chan.their_revocation_basepoint.unwrap(), &chan.their_payment_basepoint.unwrap(), &chan.their_htlc_basepoint.unwrap()).unwrap();
3978 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
3980 macro_rules! test_commitment {
3981 ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
3982 unsigned_tx = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, chan.feerate_per_kw);
3983 let their_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
3984 let sighash = Message::from_slice(&bip143::SighashComponents::new(&unsigned_tx.0).sighash_all(&unsigned_tx.0.input[0], &chan.get_funding_redeemscript(), chan.channel_value_satoshis)[..]).unwrap();
3985 secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey.unwrap()).unwrap();
3987 chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
3989 assert_eq!(serialize(&unsigned_tx.0)[..],
3990 hex::decode($tx_hex).unwrap()[..]);
3994 macro_rules! test_htlc_output {
3995 ( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
3996 let remote_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
3998 let ref htlc = unsigned_tx.1[$htlc_idx];
3999 let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys, chan.feerate_per_kw);
4000 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
4001 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
4002 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
4004 let mut preimage: Option<[u8; 32]> = None;
4007 let mut sha = Sha256::new();
4008 sha.input(&[i; 32]);
4010 let mut out = [0; 32];
4011 sha.result(&mut out);
4013 if out == htlc.payment_hash {
4014 preimage = Some([i; 32]);
4018 assert!(preimage.is_some());
4021 chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
4022 assert_eq!(serialize(&htlc_tx)[..],
4023 hex::decode($tx_hex).unwrap()[..]);
4028 // simple commitment tx with no HTLCs
4029 chan.value_to_self_msat = 7000000000;
4031 test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
4032 "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
4033 "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");
4036 chan.pending_inbound_htlcs.push({
4037 let mut out = InboundHTLCOutput{
4039 amount_msat: 1000000,
4041 payment_hash: [0; 32],
4042 state: InboundHTLCState::Committed,
4044 let mut sha = Sha256::new();
4045 sha.input(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
4046 sha.result(&mut out.payment_hash);
4049 chan.pending_inbound_htlcs.push({
4050 let mut out = InboundHTLCOutput{
4052 amount_msat: 2000000,
4054 payment_hash: [0; 32],
4055 state: InboundHTLCState::Committed,
4057 let mut sha = Sha256::new();
4058 sha.input(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
4059 sha.result(&mut out.payment_hash);
4062 chan.pending_outbound_htlcs.push({
4063 let mut out = OutboundHTLCOutput{
4065 amount_msat: 2000000,
4067 payment_hash: [0; 32],
4068 state: OutboundHTLCState::Committed,
4069 source: HTLCSource::dummy(),
4072 let mut sha = Sha256::new();
4073 sha.input(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
4074 sha.result(&mut out.payment_hash);
4077 chan.pending_outbound_htlcs.push({
4078 let mut out = OutboundHTLCOutput{
4080 amount_msat: 3000000,
4082 payment_hash: [0; 32],
4083 state: OutboundHTLCState::Committed,
4084 source: HTLCSource::dummy(),
4087 let mut sha = Sha256::new();
4088 sha.input(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
4089 sha.result(&mut out.payment_hash);
4092 chan.pending_inbound_htlcs.push({
4093 let mut out = InboundHTLCOutput{
4095 amount_msat: 4000000,
4097 payment_hash: [0; 32],
4098 state: InboundHTLCState::Committed,
4100 let mut sha = Sha256::new();
4101 sha.input(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
4102 sha.result(&mut out.payment_hash);
4107 // commitment tx with all five HTLCs untrimmed (minimum feerate)
4108 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4109 chan.feerate_per_kw = 0;
4111 test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
4112 "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
4113 "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");
4115 assert_eq!(unsigned_tx.1.len(), 5);
4117 test_htlc_output!(0,
4118 "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
4119 "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
4120 "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");
4122 test_htlc_output!(1,
4123 "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
4124 "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
4125 "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");
4127 test_htlc_output!(2,
4128 "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
4129 "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
4130 "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");
4132 test_htlc_output!(3,
4133 "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
4134 "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
4135 "020000000001018154ecccf11a5fb56c39654c4deb4d2296f83c69268280b94d021370c94e219703000000000000000001b80b0000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554014730440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac0872701008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
4137 test_htlc_output!(4,
4138 "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
4139 "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
4140 "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");
4144 // commitment tx with seven outputs untrimmed (maximum feerate)
4145 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4146 chan.feerate_per_kw = 647;
4148 test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
4149 "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
4150 "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");
4152 assert_eq!(unsigned_tx.1.len(), 5);
4154 test_htlc_output!(0,
4155 "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
4156 "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
4157 "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");
4159 test_htlc_output!(1,
4160 "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
4161 "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
4162 "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");
4164 test_htlc_output!(2,
4165 "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
4166 "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
4167 "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");
4169 test_htlc_output!(3,
4170 "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
4171 "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
4172 "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");
4174 test_htlc_output!(4,
4175 "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
4176 "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
4177 "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");
4181 // commitment tx with six outputs untrimmed (minimum feerate)
4182 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4183 chan.feerate_per_kw = 648;
4185 test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
4186 "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
4187 "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");
4189 assert_eq!(unsigned_tx.1.len(), 4);
4191 test_htlc_output!(0,
4192 "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
4193 "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
4194 "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");
4196 test_htlc_output!(1,
4197 "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
4198 "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
4199 "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");
4201 test_htlc_output!(2,
4202 "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
4203 "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
4204 "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");
4206 test_htlc_output!(3,
4207 "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
4208 "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
4209 "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");
4213 // commitment tx with six outputs untrimmed (maximum feerate)
4214 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4215 chan.feerate_per_kw = 2069;
4217 test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
4218 "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
4219 "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");
4221 assert_eq!(unsigned_tx.1.len(), 4);
4223 test_htlc_output!(0,
4224 "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
4225 "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
4226 "02000000000101ca94a9ad516ebc0c4bdd7b6254871babfa978d5accafb554214137d398bfcf6a0000000000000000000175020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f99201473044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae6640201008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000");
4228 test_htlc_output!(1,
4229 "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
4230 "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
4231 "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");
4233 test_htlc_output!(2,
4234 "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
4235 "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
4236 "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");
4238 test_htlc_output!(3,
4239 "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
4240 "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
4241 "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");
4245 // commitment tx with five outputs untrimmed (minimum feerate)
4246 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4247 chan.feerate_per_kw = 2070;
4249 test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
4250 "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
4251 "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");
4253 assert_eq!(unsigned_tx.1.len(), 3);
4255 test_htlc_output!(0,
4256 "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
4257 "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
4258 "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");
4260 test_htlc_output!(1,
4261 "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
4262 "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
4263 "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");
4265 test_htlc_output!(2,
4266 "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
4267 "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
4268 "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");
4272 // commitment tx with five outputs untrimmed (maximum feerate)
4273 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4274 chan.feerate_per_kw = 2194;
4276 test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
4277 "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
4278 "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");
4280 assert_eq!(unsigned_tx.1.len(), 3);
4282 test_htlc_output!(0,
4283 "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
4284 "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
4285 "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");
4287 test_htlc_output!(1,
4288 "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
4289 "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
4290 "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");
4292 test_htlc_output!(2,
4293 "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
4294 "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
4295 "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");
4299 // commitment tx with four outputs untrimmed (minimum feerate)
4300 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4301 chan.feerate_per_kw = 2195;
4303 test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
4304 "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
4305 "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8004b80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110b8976a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e040047304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a54290147304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb792429801475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
4307 assert_eq!(unsigned_tx.1.len(), 2);
4309 test_htlc_output!(0,
4310 "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
4311 "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
4312 "020000000001014e16c488fa158431c1a82e8f661240ec0a71ba0ce92f2721a6538c510226ad5c0000000000000000000109060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc01483045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc70439001008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
4314 test_htlc_output!(1,
4315 "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
4316 "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
4317 "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");
4321 // commitment tx with four outputs untrimmed (maximum feerate)
4322 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4323 chan.feerate_per_kw = 3702;
4325 test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
4326 "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
4327 "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");
4329 assert_eq!(unsigned_tx.1.len(), 2);
4331 test_htlc_output!(0,
4332 "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
4333 "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
4334 "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");
4336 test_htlc_output!(1,
4337 "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
4338 "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
4339 "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");
4343 // commitment tx with three outputs untrimmed (minimum feerate)
4344 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4345 chan.feerate_per_kw = 3703;
4347 test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
4348 "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
4349 "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");
4351 assert_eq!(unsigned_tx.1.len(), 1);
4353 test_htlc_output!(0,
4354 "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
4355 "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
4356 "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");
4360 // commitment tx with three outputs untrimmed (maximum feerate)
4361 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4362 chan.feerate_per_kw = 4914;
4364 test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
4365 "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
4366 "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");
4368 assert_eq!(unsigned_tx.1.len(), 1);
4370 test_htlc_output!(0,
4371 "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
4372 "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
4373 "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");
4377 // commitment tx with two outputs untrimmed (minimum feerate)
4378 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4379 chan.feerate_per_kw = 4915;
4381 test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
4382 "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
4383 "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");
4385 assert_eq!(unsigned_tx.1.len(), 0);
4389 // commitment tx with two outputs untrimmed (maximum feerate)
4390 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4391 chan.feerate_per_kw = 9651180;
4393 test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
4394 "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
4395 "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");
4397 assert_eq!(unsigned_tx.1.len(), 0);
4401 // commitment tx with one output untrimmed (minimum feerate)
4402 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4403 chan.feerate_per_kw = 9651181;
4405 test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
4406 "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
4407 "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");
4409 assert_eq!(unsigned_tx.1.len(), 0);
4413 // commitment tx with fee greater than funder amount
4414 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4415 chan.feerate_per_kw = 9651936;
4417 test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
4418 "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
4419 "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");
4421 assert_eq!(unsigned_tx.1.len(), 0);
4426 fn test_per_commitment_secret_gen() {
4427 // Test vectors from BOLT 3 Appendix D:
4429 let mut seed = [0; 32];
4430 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
4431 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
4432 hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
4434 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
4435 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
4436 hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
4438 assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
4439 hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
4441 assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
4442 hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
4444 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
4445 assert_eq!(chan_utils::build_commitment_secret(seed, 1),
4446 hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
4450 fn test_key_derivation() {
4451 // Test vectors from BOLT 3 Appendix E:
4452 let secp_ctx = Secp256k1::new();
4454 let base_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
4455 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
4457 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
4458 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
4460 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
4461 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
4463 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
4464 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
4466 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
4467 SecretKey::from_slice(&secp_ctx, &hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
4469 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
4470 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
4472 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
4473 SecretKey::from_slice(&secp_ctx, &hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());