1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 use bitcoin::blockdata::script::{Script,Builder};
11 use bitcoin::blockdata::transaction::{Transaction, SigHashType};
12 use bitcoin::util::bip143;
13 use bitcoin::consensus::encode;
15 use bitcoin::hashes::Hash;
16 use bitcoin::hashes::sha256::Hash as Sha256;
17 use bitcoin::hashes::sha256d::Hash as Sha256d;
18 use bitcoin::hash_types::{Txid, BlockHash};
20 use bitcoin::secp256k1::constants::PUBLIC_KEY_SIZE;
21 use bitcoin::secp256k1::key::{PublicKey,SecretKey};
22 use bitcoin::secp256k1::{Secp256k1,Signature};
23 use bitcoin::secp256k1;
25 use ln::{PaymentPreimage, PaymentHash};
26 use ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures};
28 use ln::msgs::{DecodeError, OptionalField, DataLossProtect};
29 use ln::script::{self, ShutdownScript};
30 use ln::channelmanager::{CounterpartyForwardingInfo, PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT};
31 use ln::chan_utils::{CounterpartyCommitmentSecrets, TxCreationKeys, HTLCOutputInCommitment, HTLC_SUCCESS_TX_WEIGHT, HTLC_TIMEOUT_TX_WEIGHT, make_funding_redeemscript, ChannelPublicKeys, CommitmentTransaction, HolderCommitmentTransaction, ChannelTransactionParameters, CounterpartyChannelTransactionParameters, MAX_HTLCS, get_commitment_transaction_number_obscure_factor, ClosingTransaction};
34 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
35 use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, LATENCY_GRACE_PERIOD_BLOCKS};
36 use chain::transaction::{OutPoint, TransactionData};
37 use chain::keysinterface::{Sign, KeysInterface};
38 use util::events::ClosureReason;
39 use util::ser::{Readable, ReadableArgs, Writeable, Writer, VecWriter};
40 use util::logger::Logger;
41 use util::errors::APIError;
42 use util::config::{UserConfig,ChannelConfig};
43 use util::scid_utils::scid_from_parts;
47 use core::{cmp,mem,fmt};
49 #[cfg(any(test, feature = "fuzztarget", debug_assertions))]
51 use bitcoin::hashes::hex::ToHex;
54 pub struct ChannelValueStat {
55 pub value_to_self_msat: u64,
56 pub channel_value_msat: u64,
57 pub channel_reserve_msat: u64,
58 pub pending_outbound_htlcs_amount_msat: u64,
59 pub pending_inbound_htlcs_amount_msat: u64,
60 pub holding_cell_outbound_amount_msat: u64,
61 pub counterparty_max_htlc_value_in_flight_msat: u64, // outgoing
62 pub counterparty_dust_limit_msat: u64,
65 #[derive(Debug, Clone, Copy, PartialEq)]
67 // Inbound states mirroring InboundHTLCState
69 AwaitingRemoteRevokeToAnnounce,
70 // Note that we do not have a AwaitingAnnouncedRemoteRevoke variant here as it is universally
71 // handled the same as `Committed`, with the only exception in `InboundHTLCState` being the
72 // distinction of when we allow ourselves to forward the HTLC. Because we aren't "forwarding"
73 // the fee update anywhere, we can simply consider the fee update `Committed` immediately
74 // instead of setting it to AwaitingAnnouncedRemoteRevoke.
76 // Outbound state can only be `LocalAnnounced` or `Committed`
80 enum InboundHTLCRemovalReason {
81 FailRelay(msgs::OnionErrorPacket),
82 FailMalformed(([u8; 32], u16)),
83 Fulfill(PaymentPreimage),
86 enum InboundHTLCState {
87 /// Offered by remote, to be included in next local commitment tx. I.e., the remote sent an
88 /// update_add_htlc message for this HTLC.
89 RemoteAnnounced(PendingHTLCStatus),
90 /// Included in a received commitment_signed message (implying we've
91 /// revoke_and_ack'd it), but the remote hasn't yet revoked their previous
92 /// state (see the example below). We have not yet included this HTLC in a
93 /// commitment_signed message because we are waiting on the remote's
94 /// aforementioned state revocation. One reason this missing remote RAA
95 /// (revoke_and_ack) blocks us from constructing a commitment_signed message
96 /// is because every time we create a new "state", i.e. every time we sign a
97 /// new commitment tx (see [BOLT #2]), we need a new per_commitment_point,
98 /// which are provided one-at-a-time in each RAA. E.g., the last RAA they
99 /// sent provided the per_commitment_point for our current commitment tx.
100 /// The other reason we should not send a commitment_signed without their RAA
101 /// is because their RAA serves to ACK our previous commitment_signed.
103 /// Here's an example of how an HTLC could come to be in this state:
104 /// remote --> update_add_htlc(prev_htlc) --> local
105 /// remote --> commitment_signed(prev_htlc) --> local
106 /// remote <-- revoke_and_ack <-- local
107 /// remote <-- commitment_signed(prev_htlc) <-- local
108 /// [note that here, the remote does not respond with a RAA]
109 /// remote --> update_add_htlc(this_htlc) --> local
110 /// remote --> commitment_signed(prev_htlc, this_htlc) --> local
111 /// Now `this_htlc` will be assigned this state. It's unable to be officially
112 /// accepted, i.e. included in a commitment_signed, because we're missing the
113 /// RAA that provides our next per_commitment_point. The per_commitment_point
114 /// is used to derive commitment keys, which are used to construct the
115 /// signatures in a commitment_signed message.
116 /// Implies AwaitingRemoteRevoke.
118 /// [BOLT #2]: https://github.com/lightningnetwork/lightning-rfc/blob/master/02-peer-protocol.md
119 AwaitingRemoteRevokeToAnnounce(PendingHTLCStatus),
120 /// Included in a received commitment_signed message (implying we've revoke_and_ack'd it).
121 /// We have also included this HTLC in our latest commitment_signed and are now just waiting
122 /// on the remote's revoke_and_ack to make this HTLC an irrevocable part of the state of the
123 /// channel (before it can then get forwarded and/or removed).
124 /// Implies AwaitingRemoteRevoke.
125 AwaitingAnnouncedRemoteRevoke(PendingHTLCStatus),
127 /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
128 /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
130 /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
131 /// commitment transaction without it as otherwise we'll have to force-close the channel to
132 /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
133 /// anyway). That said, ChannelMonitor does this for us (see
134 /// ChannelMonitor::should_broadcast_holder_commitment_txn) so we actually remove the HTLC from
135 /// our own local state before then, once we're sure that the next commitment_signed and
136 /// ChannelMonitor::provide_latest_local_commitment_tx will not include this HTLC.
137 LocalRemoved(InboundHTLCRemovalReason),
140 struct InboundHTLCOutput {
144 payment_hash: PaymentHash,
145 state: InboundHTLCState,
148 enum OutboundHTLCState {
149 /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
150 /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
151 /// we will promote to Committed (note that they may not accept it until the next time we
152 /// revoke, but we don't really care about that:
153 /// * they've revoked, so worst case we can announce an old state and get our (option on)
154 /// money back (though we won't), and,
155 /// * we'll send them a revoke when they send a commitment_signed, and since only they're
156 /// allowed to remove it, the "can only be removed once committed on both sides" requirement
157 /// doesn't matter to us and it's up to them to enforce it, worst-case they jump ahead but
158 /// we'll never get out of sync).
159 /// Note that we Box the OnionPacket as it's rather large and we don't want to blow up
160 /// OutboundHTLCOutput's size just for a temporary bit
161 LocalAnnounced(Box<msgs::OnionPacket>),
163 /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
164 /// the change (though they'll need to revoke before we fail the payment).
165 RemoteRemoved(Option<HTLCFailReason>),
166 /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
167 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
168 /// can do any backwards failing. Implies AwaitingRemoteRevoke.
169 /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
170 /// remote revoke_and_ack on a previous state before we can do so.
171 AwaitingRemoteRevokeToRemove(Option<HTLCFailReason>),
172 /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
173 /// the remote side hasn't yet revoked their previous state, which we need them to do before we
174 /// can do any backwards failing. Implies AwaitingRemoteRevoke.
175 /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
176 /// revoke_and_ack to drop completely.
177 AwaitingRemovedRemoteRevoke(Option<HTLCFailReason>),
180 struct OutboundHTLCOutput {
184 payment_hash: PaymentHash,
185 state: OutboundHTLCState,
189 /// See AwaitingRemoteRevoke ChannelState for more info
190 enum HTLCUpdateAwaitingACK {
191 AddHTLC { // TODO: Time out if we're getting close to cltv_expiry
195 payment_hash: PaymentHash,
197 onion_routing_packet: msgs::OnionPacket,
200 payment_preimage: PaymentPreimage,
205 err_packet: msgs::OnionErrorPacket,
209 /// There are a few "states" and then a number of flags which can be applied:
210 /// We first move through init with OurInitSent -> TheirInitSent -> FundingCreated -> FundingSent.
211 /// TheirFundingLocked and OurFundingLocked then get set on FundingSent, and when both are set we
212 /// move on to ChannelFunded.
213 /// Note that PeerDisconnected can be set on both ChannelFunded and FundingSent.
214 /// ChannelFunded can then get all remaining flags set on it, until we finish shutdown, then we
215 /// move on to ShutdownComplete, at which point most calls into this channel are disallowed.
217 /// Implies we have (or are prepared to) send our open_channel/accept_channel message
218 OurInitSent = 1 << 0,
219 /// Implies we have received their open_channel/accept_channel message
220 TheirInitSent = 1 << 1,
221 /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
222 /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
223 /// upon receipt of funding_created, so simply skip this state.
225 /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
226 /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
227 /// and our counterparty consider the funding transaction confirmed.
229 /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
230 /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
231 TheirFundingLocked = 1 << 4,
232 /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
233 /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
234 OurFundingLocked = 1 << 5,
236 /// Flag which is set on ChannelFunded and FundingSent indicating remote side is considered
237 /// "disconnected" and no updates are allowed until after we've done a channel_reestablish
239 PeerDisconnected = 1 << 7,
240 /// Flag which is set on ChannelFunded, FundingCreated, and FundingSent indicating the user has
241 /// told us they failed to update our ChannelMonitor somewhere and we should pause sending any
242 /// outbound messages until they've managed to do so.
243 MonitorUpdateFailed = 1 << 8,
244 /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
245 /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
246 /// messages as then we will be unable to determine which HTLCs they included in their
247 /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
249 /// Flag is set on ChannelFunded.
250 AwaitingRemoteRevoke = 1 << 9,
251 /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
252 /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
253 /// to respond with our own shutdown message when possible.
254 RemoteShutdownSent = 1 << 10,
255 /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
256 /// point, we may not add any new HTLCs to the channel.
257 LocalShutdownSent = 1 << 11,
258 /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
259 /// to drop us, but we store this anyway.
260 ShutdownComplete = 4096,
262 const BOTH_SIDES_SHUTDOWN_MASK: u32 = ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32;
263 const MULTI_STATE_FLAGS: u32 = BOTH_SIDES_SHUTDOWN_MASK | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32;
265 pub const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
267 /// The "channel disabled" bit in channel_update must be set based on whether we are connected to
268 /// our counterparty or not. However, we don't want to announce updates right away to avoid
269 /// spamming the network with updates if the connection is flapping. Instead, we "stage" updates to
270 /// our channel_update message and track the current state here.
271 /// See implementation at [`super::channelmanager::ChannelManager::timer_tick_occurred`].
272 #[derive(Clone, Copy, PartialEq)]
273 pub(super) enum ChannelUpdateStatus {
274 /// We've announced the channel as enabled and are connected to our peer.
276 /// Our channel is no longer live, but we haven't announced the channel as disabled yet.
278 /// Our channel is live again, but we haven't announced the channel as enabled yet.
280 /// We've announced the channel as disabled.
284 /// An enum indicating whether the local or remote side offered a given HTLC.
290 /// An enum gathering stats on pending HTLCs, either inbound or outbound side.
293 pending_htlcs_value_msat: u64,
294 on_counterparty_tx_dust_exposure_msat: u64,
295 on_holder_tx_dust_exposure_msat: u64,
296 holding_cell_msat: u64,
297 on_holder_tx_holding_cell_htlcs_count: u32, // dust HTLCs *non*-included
300 /// An enum gathering stats on commitment transaction, either local or remote.
301 struct CommitmentStats<'a> {
302 tx: CommitmentTransaction, // the transaction info
303 feerate_per_kw: u32, // the feerate included to build the transaction
304 total_fee_sat: u64, // the total fee included in the transaction
305 num_nondust_htlcs: usize, // the number of HTLC outputs (dust HTLCs *non*-included)
306 htlcs_included: Vec<(HTLCOutputInCommitment, Option<&'a HTLCSource>)>, // the list of HTLCs (dust HTLCs *included*) which were not ignored when building the transaction
307 local_balance_msat: u64, // local balance before fees but considering dust limits
308 remote_balance_msat: u64, // remote balance before fees but considering dust limits
311 /// Used when calculating whether we or the remote can afford an additional HTLC.
312 struct HTLCCandidate {
314 origin: HTLCInitiator,
318 fn new(amount_msat: u64, origin: HTLCInitiator) -> Self {
326 /// A return value enum for get_update_fulfill_htlc. See UpdateFulfillCommitFetch variants for
328 enum UpdateFulfillFetch {
330 monitor_update: ChannelMonitorUpdate,
331 htlc_value_msat: u64,
332 msg: Option<msgs::UpdateFulfillHTLC>,
337 /// The return type of get_update_fulfill_htlc_and_commit.
338 pub enum UpdateFulfillCommitFetch {
339 /// Indicates the HTLC fulfill is new, and either generated an update_fulfill message, placed
340 /// it in the holding cell, or re-generated the update_fulfill message after the same claim was
341 /// previously placed in the holding cell (and has since been removed).
343 /// The ChannelMonitorUpdate which places the new payment preimage in the channel monitor
344 monitor_update: ChannelMonitorUpdate,
345 /// The value of the HTLC which was claimed, in msat.
346 htlc_value_msat: u64,
347 /// The update_fulfill message and commitment_signed message (if the claim was not placed
348 /// in the holding cell).
349 msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>,
351 /// Indicates the HTLC fulfill is duplicative and already existed either in the holding cell
352 /// or has been forgotten (presumably previously claimed).
356 /// The return value of `revoke_and_ack` on success, primarily updates to other channels or HTLC
358 pub(super) struct RAAUpdates {
359 pub commitment_update: Option<msgs::CommitmentUpdate>,
360 pub accepted_htlcs: Vec<(PendingHTLCInfo, u64)>,
361 pub failed_htlcs: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>,
362 pub finalized_claimed_htlcs: Vec<HTLCSource>,
363 pub monitor_update: ChannelMonitorUpdate,
364 pub holding_cell_failed_htlcs: Vec<(HTLCSource, PaymentHash)>,
367 /// The return value of `monitor_updating_restored`
368 pub(super) struct MonitorRestoreUpdates {
369 pub raa: Option<msgs::RevokeAndACK>,
370 pub commitment_update: Option<msgs::CommitmentUpdate>,
371 pub order: RAACommitmentOrder,
372 pub accepted_htlcs: Vec<(PendingHTLCInfo, u64)>,
373 pub failed_htlcs: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>,
374 pub finalized_claimed_htlcs: Vec<HTLCSource>,
375 pub funding_broadcastable: Option<Transaction>,
376 pub funding_locked: Option<msgs::FundingLocked>,
379 /// If the majority of the channels funds are to the fundee and the initiator holds only just
380 /// enough funds to cover their reserve value, channels are at risk of getting "stuck". Because the
381 /// initiator controls the feerate, if they then go to increase the channel fee, they may have no
382 /// balance but the fundee is unable to send a payment as the increase in fee more than drains
383 /// their reserve value. Thus, neither side can send a new HTLC and the channel becomes useless.
384 /// Thus, before sending an HTLC when we are the initiator, we check that the feerate can increase
385 /// by this multiple without hitting this case, before sending.
386 /// This multiple is effectively the maximum feerate "jump" we expect until more HTLCs flow over
387 /// the channel. Sadly, there isn't really a good number for this - if we expect to have no new
388 /// HTLCs for days we may need this to suffice for feerate increases across days, but that may
389 /// leave the channel less usable as we hold a bigger reserve.
391 pub const FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE: u64 = 2;
393 const FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE: u64 = 2;
395 /// If we fail to see a funding transaction confirmed on-chain within this many blocks after the
396 /// channel creation on an inbound channel, we simply force-close and move on.
397 /// This constant is the one suggested in BOLT 2.
398 pub(crate) const FUNDING_CONF_DEADLINE_BLOCKS: u32 = 2016;
400 /// In case of a concurrent update_add_htlc proposed by our counterparty, we might
401 /// not have enough balance value remaining to cover the onchain cost of this new
402 /// HTLC weight. If this happens, our counterparty fails the reception of our
403 /// commitment_signed including this new HTLC due to infringement on the channel
405 /// To prevent this case, we compute our outbound update_fee with an HTLC buffer of
406 /// size 2. However, if the number of concurrent update_add_htlc is higher, this still
407 /// leads to a channel force-close. Ultimately, this is an issue coming from the
408 /// design of LN state machines, allowing asynchronous updates.
409 const CONCURRENT_INBOUND_HTLC_FEE_BUFFER: u32 = 2;
411 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
412 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
413 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
416 // Holder designates channel data owned for the benefice of the user client.
417 // Counterparty designates channel data owned by the another channel participant entity.
418 pub(super) struct Channel<Signer: Sign> {
419 #[cfg(any(test, feature = "_test_utils"))]
420 pub(crate) config: ChannelConfig,
421 #[cfg(not(any(test, feature = "_test_utils")))]
422 config: ChannelConfig,
426 channel_id: [u8; 32],
428 secp_ctx: Secp256k1<secp256k1::All>,
429 channel_value_satoshis: u64,
431 latest_monitor_update_id: u64,
433 holder_signer: Signer,
434 shutdown_scriptpubkey: Option<ShutdownScript>,
435 destination_script: Script,
437 // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
438 // generation start at 0 and count up...this simplifies some parts of implementation at the
439 // cost of others, but should really just be changed.
441 cur_holder_commitment_transaction_number: u64,
442 cur_counterparty_commitment_transaction_number: u64,
443 value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
444 pending_inbound_htlcs: Vec<InboundHTLCOutput>,
445 pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
446 holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
448 /// When resending CS/RAA messages on channel monitor restoration or on reconnect, we always
449 /// need to ensure we resend them in the order we originally generated them. Note that because
450 /// there can only ever be one in-flight CS and/or one in-flight RAA at any time, it is
451 /// sufficient to simply set this to the opposite of any message we are generating as we
452 /// generate it. ie when we generate a CS, we set this to RAAFirst as, if there is a pending
453 /// in-flight RAA to resend, it will have been the first thing we generated, and thus we should
455 resend_order: RAACommitmentOrder,
457 monitor_pending_funding_locked: bool,
458 monitor_pending_revoke_and_ack: bool,
459 monitor_pending_commitment_signed: bool,
460 monitor_pending_forwards: Vec<(PendingHTLCInfo, u64)>,
461 monitor_pending_failures: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>,
462 monitor_pending_finalized_fulfills: Vec<HTLCSource>,
464 // pending_update_fee is filled when sending and receiving update_fee.
466 // Because it follows the same commitment flow as HTLCs, `FeeUpdateState` is either `Outbound`
467 // or matches a subset of the `InboundHTLCOutput` variants. It is then updated/used when
468 // generating new commitment transactions with exactly the same criteria as inbound/outbound
469 // HTLCs with similar state.
470 pending_update_fee: Option<(u32, FeeUpdateState)>,
471 // If a `send_update_fee()` call is made with ChannelState::AwaitingRemoteRevoke set, we place
472 // it here instead of `pending_update_fee` in the same way as we place outbound HTLC updates in
473 // `holding_cell_htlc_updates` instead of `pending_outbound_htlcs`. It is released into
474 // `pending_update_fee` with the same criteria as outbound HTLC updates but can be updated by
475 // further `send_update_fee` calls, dropping the previous holding cell update entirely.
476 holding_cell_update_fee: Option<u32>,
477 next_holder_htlc_id: u64,
478 next_counterparty_htlc_id: u64,
479 update_time_counter: u32,
482 #[cfg(debug_assertions)]
483 /// Max to_local and to_remote outputs in a locally-generated commitment transaction
484 holder_max_commitment_tx_output: Mutex<(u64, u64)>,
485 #[cfg(debug_assertions)]
486 /// Max to_local and to_remote outputs in a remote-generated commitment transaction
487 counterparty_max_commitment_tx_output: Mutex<(u64, u64)>,
489 last_sent_closing_fee: Option<(u64, Signature)>, // (fee, holder_sig)
490 target_closing_feerate_sats_per_kw: Option<u32>,
492 /// If our counterparty sent us a closing_signed while we were waiting for a `ChannelMonitor`
493 /// update, we need to delay processing it until later. We do that here by simply storing the
494 /// closing_signed message and handling it in `maybe_propose_closing_signed`.
495 pending_counterparty_closing_signed: Option<msgs::ClosingSigned>,
497 /// The minimum and maximum absolute fee, in satoshis, we are willing to place on the closing
498 /// transaction. These are set once we reach `closing_negotiation_ready`.
500 pub(crate) closing_fee_limits: Option<(u64, u64)>,
502 closing_fee_limits: Option<(u64, u64)>,
504 /// The hash of the block in which the funding transaction was included.
505 funding_tx_confirmed_in: Option<BlockHash>,
506 funding_tx_confirmation_height: u32,
507 short_channel_id: Option<u64>,
508 /// Either the height at which this channel was created or the height at which it was last
509 /// serialized if it was serialized by versions prior to 0.0.103.
510 /// We use this to close if funding is never broadcasted.
511 channel_creation_height: u32,
513 counterparty_dust_limit_satoshis: u64,
515 pub(super) holder_dust_limit_satoshis: u64,
517 holder_dust_limit_satoshis: u64,
519 pub(super) counterparty_max_htlc_value_in_flight_msat: u64,
521 counterparty_max_htlc_value_in_flight_msat: u64,
522 //get_holder_max_htlc_value_in_flight_msat(): u64,
523 /// minimum channel reserve for self to maintain - set by them.
524 counterparty_selected_channel_reserve_satoshis: Option<u64>,
525 // get_holder_selected_channel_reserve_satoshis(channel_value_sats: u64): u64
526 counterparty_htlc_minimum_msat: u64,
527 holder_htlc_minimum_msat: u64,
529 pub counterparty_max_accepted_htlcs: u16,
531 counterparty_max_accepted_htlcs: u16,
532 //implied by OUR_MAX_HTLCS: max_accepted_htlcs: u16,
533 minimum_depth: Option<u32>,
535 counterparty_forwarding_info: Option<CounterpartyForwardingInfo>,
537 pub(crate) channel_transaction_parameters: ChannelTransactionParameters,
538 funding_transaction: Option<Transaction>,
540 counterparty_cur_commitment_point: Option<PublicKey>,
541 counterparty_prev_commitment_point: Option<PublicKey>,
542 counterparty_node_id: PublicKey,
544 counterparty_shutdown_scriptpubkey: Option<Script>,
546 commitment_secrets: CounterpartyCommitmentSecrets,
548 channel_update_status: ChannelUpdateStatus,
549 /// Once we reach `closing_negotiation_ready`, we set this, indicating if closing_signed does
550 /// not complete within a single timer tick (one minute), we should force-close the channel.
551 /// This prevents us from keeping unusable channels around forever if our counterparty wishes
553 /// Note that this field is reset to false on deserialization to give us a chance to connect to
554 /// our peer and start the closing_signed negotiation fresh.
555 closing_signed_in_flight: bool,
557 /// Our counterparty's channel_announcement signatures provided in announcement_signatures.
558 /// This can be used to rebroadcast the channel_announcement message later.
559 announcement_sigs: Option<(Signature, Signature)>,
561 // We save these values so we can make sure `next_local_commit_tx_fee_msat` and
562 // `next_remote_commit_tx_fee_msat` properly predict what the next commitment transaction fee will
563 // be, by comparing the cached values to the fee of the tranaction generated by
564 // `build_commitment_transaction`.
565 #[cfg(any(test, feature = "fuzztarget"))]
566 next_local_commitment_tx_fee_info_cached: Mutex<Option<CommitmentTxInfoCached>>,
567 #[cfg(any(test, feature = "fuzztarget"))]
568 next_remote_commitment_tx_fee_info_cached: Mutex<Option<CommitmentTxInfoCached>>,
570 /// lnd has a long-standing bug where, upon reconnection, if the channel is not yet confirmed
571 /// they will not send a channel_reestablish until the channel locks in. Then, they will send a
572 /// funding_locked *before* sending the channel_reestablish (which is clearly a violation of
573 /// the BOLT specs). We copy c-lightning's workaround here and simply store the funding_locked
574 /// message until we receive a channel_reestablish.
576 /// See-also <https://github.com/lightningnetwork/lnd/issues/4006>
577 pub workaround_lnd_bug_4006: Option<msgs::FundingLocked>,
579 #[cfg(any(test, feature = "fuzztarget"))]
580 // When we receive an HTLC fulfill on an outbound path, we may immediately fulfill the
581 // corresponding HTLC on the inbound path. If, then, the outbound path channel is
582 // disconnected and reconnected (before we've exchange commitment_signed and revoke_and_ack
583 // messages), they may re-broadcast their update_fulfill_htlc, causing a duplicate claim. This
584 // is fine, but as a sanity check in our failure to generate the second claim, we check here
585 // that the original was a claim, and that we aren't now trying to fulfill a failed HTLC.
586 historical_inbound_htlc_fulfills: HashSet<u64>,
588 /// This channel's type, as negotiated during channel open
589 channel_type: ChannelTypeFeatures,
592 #[cfg(any(test, feature = "fuzztarget"))]
593 struct CommitmentTxInfoCached {
595 total_pending_htlcs: usize,
596 next_holder_htlc_id: u64,
597 next_counterparty_htlc_id: u64,
601 pub const OUR_MAX_HTLCS: u16 = 50; //TODO
604 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
606 pub const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
608 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
610 pub const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
612 pub const ANCHOR_OUTPUT_VALUE_SATOSHI: u64 = 330;
614 /// Maximum `funding_satoshis` value, according to the BOLT #2 specification
616 pub const MAX_FUNDING_SATOSHIS: u64 = 1 << 24;
618 /// The maximum network dust limit for standard script formats. This currently represents the
619 /// minimum output value for a P2SH output before Bitcoin Core 22 considers the entire
620 /// transaction non-standard and thus refuses to relay it.
621 /// We also use this as the maximum counterparty `dust_limit_satoshis` allowed, given many
622 /// implementations use this value for their dust limit today.
623 pub const MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS: u64 = 546;
625 /// The maximum channel dust limit we will accept from our counterparty.
626 pub const MAX_CHAN_DUST_LIMIT_SATOSHIS: u64 = MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS;
628 /// The dust limit is used for both the commitment transaction outputs as well as the closing
629 /// transactions. For cooperative closing transactions, we require segwit outputs, though accept
630 /// *any* segwit scripts, which are allowed to be up to 42 bytes in length.
631 /// In order to avoid having to concern ourselves with standardness during the closing process, we
632 /// simply require our counterparty to use a dust limit which will leave any segwit output
634 /// See https://github.com/lightningnetwork/lightning-rfc/issues/905 for more details.
635 pub const MIN_CHAN_DUST_LIMIT_SATOSHIS: u64 = 354;
637 /// Used to return a simple Error back to ChannelManager. Will get converted to a
638 /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our
639 /// channel_id in ChannelManager.
640 pub(super) enum ChannelError {
644 CloseDelayBroadcast(String),
647 impl fmt::Debug for ChannelError {
648 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
650 &ChannelError::Ignore(ref e) => write!(f, "Ignore : {}", e),
651 &ChannelError::Warn(ref e) => write!(f, "Warn : {}", e),
652 &ChannelError::Close(ref e) => write!(f, "Close : {}", e),
653 &ChannelError::CloseDelayBroadcast(ref e) => write!(f, "CloseDelayBroadcast : {}", e)
658 macro_rules! secp_check {
659 ($res: expr, $err: expr) => {
662 Err(_) => return Err(ChannelError::Close($err)),
667 impl<Signer: Sign> Channel<Signer> {
668 // Convert constants + channel value to limits:
669 fn get_holder_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
670 channel_value_satoshis * 1000 / 10 //TODO
673 /// Returns a minimum channel reserve value the remote needs to maintain,
676 /// Guaranteed to return a value no larger than channel_value_satoshis
677 pub(crate) fn get_holder_selected_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
678 let (q, _) = channel_value_satoshis.overflowing_div(100);
679 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
683 pub fn new_outbound<K: Deref, F: Deref>(
684 fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, their_features: &InitFeatures,
685 channel_value_satoshis: u64, push_msat: u64, user_id: u64, config: &UserConfig, current_chain_height: u32
686 ) -> Result<Channel<Signer>, APIError>
687 where K::Target: KeysInterface<Signer = Signer>,
688 F::Target: FeeEstimator,
690 let holder_selected_contest_delay = config.own_channel_config.our_to_self_delay;
691 let holder_signer = keys_provider.get_channel_signer(false, channel_value_satoshis);
692 let pubkeys = holder_signer.pubkeys().clone();
694 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
695 return Err(APIError::APIMisuseError{err: format!("funding_value must be smaller than {}, it was {}", MAX_FUNDING_SATOSHIS, channel_value_satoshis)});
697 let channel_value_msat = channel_value_satoshis * 1000;
698 if push_msat > channel_value_msat {
699 return Err(APIError::APIMisuseError { err: format!("Push value ({}) was larger than channel_value ({})", push_msat, channel_value_msat) });
701 if holder_selected_contest_delay < BREAKDOWN_TIMEOUT {
702 return Err(APIError::APIMisuseError {err: format!("Configured with an unreasonable our_to_self_delay ({}) putting user funds at risks", holder_selected_contest_delay)});
704 let holder_selected_channel_reserve_satoshis = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(channel_value_satoshis);
705 if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
706 return Err(APIError::APIMisuseError { err: format!("Holder selected channel reserve below implemention limit dust_limit_satoshis {}", holder_selected_channel_reserve_satoshis) });
709 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
711 let mut secp_ctx = Secp256k1::new();
712 secp_ctx.seeded_randomize(&keys_provider.get_secure_random_bytes());
714 let shutdown_scriptpubkey = if config.channel_options.commit_upfront_shutdown_pubkey {
715 Some(keys_provider.get_shutdown_scriptpubkey())
718 if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
719 if !shutdown_scriptpubkey.is_compatible(&their_features) {
720 return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
726 config: config.channel_options.clone(),
728 channel_id: keys_provider.get_secure_random_bytes(),
729 channel_state: ChannelState::OurInitSent as u32,
731 channel_value_satoshis,
733 latest_monitor_update_id: 0,
736 shutdown_scriptpubkey,
737 destination_script: keys_provider.get_destination_script(),
739 cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
740 cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
741 value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
743 pending_inbound_htlcs: Vec::new(),
744 pending_outbound_htlcs: Vec::new(),
745 holding_cell_htlc_updates: Vec::new(),
746 pending_update_fee: None,
747 holding_cell_update_fee: None,
748 next_holder_htlc_id: 0,
749 next_counterparty_htlc_id: 0,
750 update_time_counter: 1,
752 resend_order: RAACommitmentOrder::CommitmentFirst,
754 monitor_pending_funding_locked: false,
755 monitor_pending_revoke_and_ack: false,
756 monitor_pending_commitment_signed: false,
757 monitor_pending_forwards: Vec::new(),
758 monitor_pending_failures: Vec::new(),
759 monitor_pending_finalized_fulfills: Vec::new(),
761 #[cfg(debug_assertions)]
762 holder_max_commitment_tx_output: Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
763 #[cfg(debug_assertions)]
764 counterparty_max_commitment_tx_output: Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
766 last_sent_closing_fee: None,
767 pending_counterparty_closing_signed: None,
768 closing_fee_limits: None,
769 target_closing_feerate_sats_per_kw: None,
771 funding_tx_confirmed_in: None,
772 funding_tx_confirmation_height: 0,
773 short_channel_id: None,
774 channel_creation_height: current_chain_height,
776 feerate_per_kw: feerate,
777 counterparty_dust_limit_satoshis: 0,
778 holder_dust_limit_satoshis: MIN_CHAN_DUST_LIMIT_SATOSHIS,
779 counterparty_max_htlc_value_in_flight_msat: 0,
780 counterparty_selected_channel_reserve_satoshis: None, // Filled in in accept_channel
781 counterparty_htlc_minimum_msat: 0,
782 holder_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
783 counterparty_max_accepted_htlcs: 0,
784 minimum_depth: None, // Filled in in accept_channel
786 counterparty_forwarding_info: None,
788 channel_transaction_parameters: ChannelTransactionParameters {
789 holder_pubkeys: pubkeys,
790 holder_selected_contest_delay: config.own_channel_config.our_to_self_delay,
791 is_outbound_from_holder: true,
792 counterparty_parameters: None,
793 funding_outpoint: None
795 funding_transaction: None,
797 counterparty_cur_commitment_point: None,
798 counterparty_prev_commitment_point: None,
799 counterparty_node_id,
801 counterparty_shutdown_scriptpubkey: None,
803 commitment_secrets: CounterpartyCommitmentSecrets::new(),
805 channel_update_status: ChannelUpdateStatus::Enabled,
806 closing_signed_in_flight: false,
808 announcement_sigs: None,
810 #[cfg(any(test, feature = "fuzztarget"))]
811 next_local_commitment_tx_fee_info_cached: Mutex::new(None),
812 #[cfg(any(test, feature = "fuzztarget"))]
813 next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
815 workaround_lnd_bug_4006: None,
817 #[cfg(any(test, feature = "fuzztarget"))]
818 historical_inbound_htlc_fulfills: HashSet::new(),
820 // We currently only actually support one channel type, so don't retry with new types
821 // on error messages. When we support more we'll need fallback support (assuming we
822 // want to support old types).
823 channel_type: ChannelTypeFeatures::only_static_remote_key(),
827 fn check_remote_fee<F: Deref>(fee_estimator: &F, feerate_per_kw: u32) -> Result<(), ChannelError>
828 where F::Target: FeeEstimator
830 let lower_limit = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
831 if feerate_per_kw < lower_limit {
832 return Err(ChannelError::Close(format!("Peer's feerate much too low. Actual: {}. Our expected lower limit: {}", feerate_per_kw, lower_limit)));
834 // We only bound the fee updates on the upper side to prevent completely absurd feerates,
835 // always accepting up to 25 sat/vByte or 10x our fee estimator's "High Priority" fee.
836 // We generally don't care too much if they set the feerate to something very high, but it
837 // could result in the channel being useless due to everything being dust.
838 let upper_limit = cmp::max(250 * 25,
839 fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) as u64 * 10);
840 if feerate_per_kw as u64 > upper_limit {
841 return Err(ChannelError::Close(format!("Peer's feerate much too high. Actual: {}. Our expected upper limit: {}", feerate_per_kw, upper_limit)));
846 /// Creates a new channel from a remote sides' request for one.
847 /// Assumes chain_hash has already been checked and corresponds with what we expect!
848 pub fn new_from_req<K: Deref, F: Deref>(
849 fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, their_features: &InitFeatures,
850 msg: &msgs::OpenChannel, user_id: u64, config: &UserConfig, current_chain_height: u32
851 ) -> Result<Channel<Signer>, ChannelError>
852 where K::Target: KeysInterface<Signer = Signer>,
853 F::Target: FeeEstimator
855 // First check the channel type is known, failing before we do anything else if we don't
856 // support this channel type.
857 let channel_type = if let Some(channel_type) = &msg.channel_type {
858 if channel_type.supports_any_optional_bits() {
859 return Err(ChannelError::Close("Channel Type field contained optional bits - this is not allowed".to_owned()));
861 if *channel_type != ChannelTypeFeatures::only_static_remote_key() {
862 return Err(ChannelError::Close("Channel Type was not understood".to_owned()));
866 ChannelTypeFeatures::from_counterparty_init(&their_features)
868 if !channel_type.supports_static_remote_key() {
869 return Err(ChannelError::Close("Channel Type was not understood - we require static remote key".to_owned()));
872 let holder_signer = keys_provider.get_channel_signer(true, msg.funding_satoshis);
873 let pubkeys = holder_signer.pubkeys().clone();
874 let counterparty_pubkeys = ChannelPublicKeys {
875 funding_pubkey: msg.funding_pubkey,
876 revocation_basepoint: msg.revocation_basepoint,
877 payment_point: msg.payment_point,
878 delayed_payment_basepoint: msg.delayed_payment_basepoint,
879 htlc_basepoint: msg.htlc_basepoint
881 let mut local_config = (*config).channel_options.clone();
883 if config.own_channel_config.our_to_self_delay < BREAKDOWN_TIMEOUT {
884 return Err(ChannelError::Close(format!("Configured with an unreasonable our_to_self_delay ({}) putting user funds at risks. It must be greater than {}", config.own_channel_config.our_to_self_delay, BREAKDOWN_TIMEOUT)));
887 // Check sanity of message fields:
888 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
889 return Err(ChannelError::Close(format!("Funding must be smaller than {}. It was {}", MAX_FUNDING_SATOSHIS, msg.funding_satoshis)));
891 if msg.channel_reserve_satoshis > msg.funding_satoshis {
892 return Err(ChannelError::Close(format!("Bogus channel_reserve_satoshis ({}). Must be not greater than funding_satoshis: {}", msg.channel_reserve_satoshis, msg.funding_satoshis)));
894 let funding_value = (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000;
895 if msg.push_msat > funding_value {
896 return Err(ChannelError::Close(format!("push_msat {} was larger than funding value {}", msg.push_msat, funding_value)));
898 if msg.dust_limit_satoshis > msg.funding_satoshis {
899 return Err(ChannelError::Close(format!("dust_limit_satoshis {} was larger than funding_satoshis {}. Peer never wants payout outputs?", msg.dust_limit_satoshis, msg.funding_satoshis)));
901 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
902 return Err(ChannelError::Close(format!("Bogus; channel reserve ({}) is less than dust limit ({})", msg.channel_reserve_satoshis, msg.dust_limit_satoshis)));
904 let full_channel_value_msat = (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000;
905 if msg.htlc_minimum_msat >= full_channel_value_msat {
906 return Err(ChannelError::Close(format!("Minimum htlc value ({}) was larger than full channel value ({})", msg.htlc_minimum_msat, full_channel_value_msat)));
908 Channel::<Signer>::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
910 let max_counterparty_selected_contest_delay = u16::min(config.peer_channel_config_limits.their_to_self_delay, MAX_LOCAL_BREAKDOWN_TIMEOUT);
911 if msg.to_self_delay > max_counterparty_selected_contest_delay {
912 return Err(ChannelError::Close(format!("They wanted our payments to be delayed by a needlessly long period. Upper limit: {}. Actual: {}", max_counterparty_selected_contest_delay, msg.to_self_delay)));
914 if msg.max_accepted_htlcs < 1 {
915 return Err(ChannelError::Close("0 max_accepted_htlcs makes for a useless channel".to_owned()));
917 if msg.max_accepted_htlcs > MAX_HTLCS {
918 return Err(ChannelError::Close(format!("max_accepted_htlcs was {}. It must not be larger than {}", msg.max_accepted_htlcs, MAX_HTLCS)));
921 // Now check against optional parameters as set by config...
922 if msg.funding_satoshis < config.peer_channel_config_limits.min_funding_satoshis {
923 return Err(ChannelError::Close(format!("Funding satoshis ({}) is less than the user specified limit ({})", msg.funding_satoshis, config.peer_channel_config_limits.min_funding_satoshis)));
925 if msg.htlc_minimum_msat > config.peer_channel_config_limits.max_htlc_minimum_msat {
926 return Err(ChannelError::Close(format!("htlc_minimum_msat ({}) is higher than the user specified limit ({})", msg.htlc_minimum_msat, config.peer_channel_config_limits.max_htlc_minimum_msat)));
928 if msg.max_htlc_value_in_flight_msat < config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat {
929 return Err(ChannelError::Close(format!("max_htlc_value_in_flight_msat ({}) is less than the user specified limit ({})", msg.max_htlc_value_in_flight_msat, config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat)));
931 if msg.channel_reserve_satoshis > config.peer_channel_config_limits.max_channel_reserve_satoshis {
932 return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is higher than the user specified limit ({})", msg.channel_reserve_satoshis, config.peer_channel_config_limits.max_channel_reserve_satoshis)));
934 if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
935 return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs)));
937 if msg.dust_limit_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
938 return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS)));
940 if msg.dust_limit_satoshis > MAX_CHAN_DUST_LIMIT_SATOSHIS {
941 return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_CHAN_DUST_LIMIT_SATOSHIS)));
944 // Convert things into internal flags and prep our state:
946 let announce = if (msg.channel_flags & 1) == 1 { true } else { false };
947 if config.peer_channel_config_limits.force_announced_channel_preference {
948 if local_config.announced_channel != announce {
949 return Err(ChannelError::Close("Peer tried to open channel but their announcement preference is different from ours".to_owned()));
952 // we either accept their preference or the preferences match
953 local_config.announced_channel = announce;
955 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
957 let holder_selected_channel_reserve_satoshis = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(msg.funding_satoshis);
958 if holder_selected_channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
959 return Err(ChannelError::Close(format!("Suitable channel reserve not found. remote_channel_reserve was ({}). dust_limit_satoshis is ({}).", holder_selected_channel_reserve_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS)));
961 if msg.channel_reserve_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
962 return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is smaller than our dust limit ({})", msg.channel_reserve_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS)));
964 if holder_selected_channel_reserve_satoshis < msg.dust_limit_satoshis {
965 return Err(ChannelError::Close(format!("Dust limit ({}) too high for the channel reserve we require the remote to keep ({})", msg.dust_limit_satoshis, holder_selected_channel_reserve_satoshis)));
968 // check if the funder's amount for the initial commitment tx is sufficient
969 // for full fee payment
970 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
971 let lower_limit = background_feerate as u64 * COMMITMENT_TX_BASE_WEIGHT;
972 if funders_amount_msat < lower_limit {
973 return Err(ChannelError::Close(format!("Insufficient funding amount ({}) for initial commitment. Must be at least {}", funders_amount_msat, lower_limit)));
976 let to_local_msat = msg.push_msat;
977 let to_remote_msat = funders_amount_msat - background_feerate as u64 * COMMITMENT_TX_BASE_WEIGHT;
978 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= holder_selected_channel_reserve_satoshis * 1000 {
979 return Err(ChannelError::Close("Insufficient funding amount for initial commitment".to_owned()));
982 let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
983 match &msg.shutdown_scriptpubkey {
984 &OptionalField::Present(ref script) => {
985 // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
986 if script.len() == 0 {
989 if !script::is_bolt2_compliant(&script, their_features) {
990 return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script)))
995 // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
996 &OptionalField::Absent => {
997 return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out".to_owned()));
1002 let shutdown_scriptpubkey = if config.channel_options.commit_upfront_shutdown_pubkey {
1003 Some(keys_provider.get_shutdown_scriptpubkey())
1006 if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
1007 if !shutdown_scriptpubkey.is_compatible(&their_features) {
1008 return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
1012 let mut secp_ctx = Secp256k1::new();
1013 secp_ctx.seeded_randomize(&keys_provider.get_secure_random_bytes());
1015 let chan = Channel {
1017 config: local_config,
1019 channel_id: msg.temporary_channel_id,
1020 channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
1023 latest_monitor_update_id: 0,
1026 shutdown_scriptpubkey,
1027 destination_script: keys_provider.get_destination_script(),
1029 cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
1030 cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
1031 value_to_self_msat: msg.push_msat,
1033 pending_inbound_htlcs: Vec::new(),
1034 pending_outbound_htlcs: Vec::new(),
1035 holding_cell_htlc_updates: Vec::new(),
1036 pending_update_fee: None,
1037 holding_cell_update_fee: None,
1038 next_holder_htlc_id: 0,
1039 next_counterparty_htlc_id: 0,
1040 update_time_counter: 1,
1042 resend_order: RAACommitmentOrder::CommitmentFirst,
1044 monitor_pending_funding_locked: false,
1045 monitor_pending_revoke_and_ack: false,
1046 monitor_pending_commitment_signed: false,
1047 monitor_pending_forwards: Vec::new(),
1048 monitor_pending_failures: Vec::new(),
1049 monitor_pending_finalized_fulfills: Vec::new(),
1051 #[cfg(debug_assertions)]
1052 holder_max_commitment_tx_output: Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
1053 #[cfg(debug_assertions)]
1054 counterparty_max_commitment_tx_output: Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
1056 last_sent_closing_fee: None,
1057 pending_counterparty_closing_signed: None,
1058 closing_fee_limits: None,
1059 target_closing_feerate_sats_per_kw: None,
1061 funding_tx_confirmed_in: None,
1062 funding_tx_confirmation_height: 0,
1063 short_channel_id: None,
1064 channel_creation_height: current_chain_height,
1066 feerate_per_kw: msg.feerate_per_kw,
1067 channel_value_satoshis: msg.funding_satoshis,
1068 counterparty_dust_limit_satoshis: msg.dust_limit_satoshis,
1069 holder_dust_limit_satoshis: MIN_CHAN_DUST_LIMIT_SATOSHIS,
1070 counterparty_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
1071 counterparty_selected_channel_reserve_satoshis: Some(msg.channel_reserve_satoshis),
1072 counterparty_htlc_minimum_msat: msg.htlc_minimum_msat,
1073 holder_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
1074 counterparty_max_accepted_htlcs: msg.max_accepted_htlcs,
1075 minimum_depth: Some(config.own_channel_config.minimum_depth),
1077 counterparty_forwarding_info: None,
1079 channel_transaction_parameters: ChannelTransactionParameters {
1080 holder_pubkeys: pubkeys,
1081 holder_selected_contest_delay: config.own_channel_config.our_to_self_delay,
1082 is_outbound_from_holder: false,
1083 counterparty_parameters: Some(CounterpartyChannelTransactionParameters {
1084 selected_contest_delay: msg.to_self_delay,
1085 pubkeys: counterparty_pubkeys,
1087 funding_outpoint: None
1089 funding_transaction: None,
1091 counterparty_cur_commitment_point: Some(msg.first_per_commitment_point),
1092 counterparty_prev_commitment_point: None,
1093 counterparty_node_id,
1095 counterparty_shutdown_scriptpubkey,
1097 commitment_secrets: CounterpartyCommitmentSecrets::new(),
1099 channel_update_status: ChannelUpdateStatus::Enabled,
1100 closing_signed_in_flight: false,
1102 announcement_sigs: None,
1104 #[cfg(any(test, feature = "fuzztarget"))]
1105 next_local_commitment_tx_fee_info_cached: Mutex::new(None),
1106 #[cfg(any(test, feature = "fuzztarget"))]
1107 next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
1109 workaround_lnd_bug_4006: None,
1111 #[cfg(any(test, feature = "fuzztarget"))]
1112 historical_inbound_htlc_fulfills: HashSet::new(),
1120 /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
1121 /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
1122 /// the transaction. Thus, b will generally be sending a signature over such a transaction to
1123 /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
1124 /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
1126 /// @local is used only to convert relevant internal structures which refer to remote vs local
1127 /// to decide value of outputs and direction of HTLCs.
1128 /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
1129 /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
1130 /// have not yet committed it. Such HTLCs will only be included in transactions which are being
1131 /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
1132 /// which peer generated this transaction and "to whom" this transaction flows.
1134 fn build_commitment_transaction<L: Deref>(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, logger: &L) -> CommitmentStats
1135 where L::Target: Logger
1137 let mut included_dust_htlcs: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::new();
1138 let num_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len();
1139 let mut included_non_dust_htlcs: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::with_capacity(num_htlcs);
1141 let broadcaster_dust_limit_satoshis = if local { self.holder_dust_limit_satoshis } else { self.counterparty_dust_limit_satoshis };
1142 let mut remote_htlc_total_msat = 0;
1143 let mut local_htlc_total_msat = 0;
1144 let mut value_to_self_msat_offset = 0;
1146 let mut feerate_per_kw = self.feerate_per_kw;
1147 if let Some((feerate, update_state)) = self.pending_update_fee {
1148 if match update_state {
1149 // Note that these match the inclusion criteria when scanning
1150 // pending_inbound_htlcs below.
1151 FeeUpdateState::RemoteAnnounced => { debug_assert!(!self.is_outbound()); !generated_by_local },
1152 FeeUpdateState::AwaitingRemoteRevokeToAnnounce => { debug_assert!(!self.is_outbound()); !generated_by_local },
1153 FeeUpdateState::Outbound => { assert!(self.is_outbound()); generated_by_local },
1155 feerate_per_kw = feerate;
1159 log_trace!(logger, "Building commitment transaction number {} (really {} xor {}) for channel {} for {}, generated by {} with fee {}...",
1160 commitment_number, (INITIAL_COMMITMENT_NUMBER - commitment_number),
1161 get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound()),
1162 log_bytes!(self.channel_id), if local { "us" } else { "remote" }, if generated_by_local { "us" } else { "remote" }, feerate_per_kw);
1164 macro_rules! get_htlc_in_commitment {
1165 ($htlc: expr, $offered: expr) => {
1166 HTLCOutputInCommitment {
1168 amount_msat: $htlc.amount_msat,
1169 cltv_expiry: $htlc.cltv_expiry,
1170 payment_hash: $htlc.payment_hash,
1171 transaction_output_index: None
1176 macro_rules! add_htlc_output {
1177 ($htlc: expr, $outbound: expr, $source: expr, $state_name: expr) => {
1178 if $outbound == local { // "offered HTLC output"
1179 let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
1180 if $htlc.amount_msat / 1000 >= broadcaster_dust_limit_satoshis + (feerate_per_kw as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
1181 log_trace!(logger, " ...including {} {} HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
1182 included_non_dust_htlcs.push((htlc_in_tx, $source));
1184 log_trace!(logger, " ...including {} {} dust HTLC {} (hash {}) with value {} due to dust limit", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
1185 included_dust_htlcs.push((htlc_in_tx, $source));
1188 let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
1189 if $htlc.amount_msat / 1000 >= broadcaster_dust_limit_satoshis + (feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) {
1190 log_trace!(logger, " ...including {} {} HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
1191 included_non_dust_htlcs.push((htlc_in_tx, $source));
1193 log_trace!(logger, " ...including {} {} dust HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
1194 included_dust_htlcs.push((htlc_in_tx, $source));
1200 for ref htlc in self.pending_inbound_htlcs.iter() {
1201 let (include, state_name) = match htlc.state {
1202 InboundHTLCState::RemoteAnnounced(_) => (!generated_by_local, "RemoteAnnounced"),
1203 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) => (!generated_by_local, "AwaitingRemoteRevokeToAnnounce"),
1204 InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => (true, "AwaitingAnnouncedRemoteRevoke"),
1205 InboundHTLCState::Committed => (true, "Committed"),
1206 InboundHTLCState::LocalRemoved(_) => (!generated_by_local, "LocalRemoved"),
1210 add_htlc_output!(htlc, false, None, state_name);
1211 remote_htlc_total_msat += htlc.amount_msat;
1213 log_trace!(logger, " ...not including inbound HTLC {} (hash {}) with value {} due to state ({})", htlc.htlc_id, log_bytes!(htlc.payment_hash.0), htlc.amount_msat, state_name);
1215 &InboundHTLCState::LocalRemoved(ref reason) => {
1216 if generated_by_local {
1217 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1218 value_to_self_msat_offset += htlc.amount_msat as i64;
1227 for ref htlc in self.pending_outbound_htlcs.iter() {
1228 let (include, state_name) = match htlc.state {
1229 OutboundHTLCState::LocalAnnounced(_) => (generated_by_local, "LocalAnnounced"),
1230 OutboundHTLCState::Committed => (true, "Committed"),
1231 OutboundHTLCState::RemoteRemoved(_) => (generated_by_local, "RemoteRemoved"),
1232 OutboundHTLCState::AwaitingRemoteRevokeToRemove(_) => (generated_by_local, "AwaitingRemoteRevokeToRemove"),
1233 OutboundHTLCState::AwaitingRemovedRemoteRevoke(_) => (false, "AwaitingRemovedRemoteRevoke"),
1237 add_htlc_output!(htlc, true, Some(&htlc.source), state_name);
1238 local_htlc_total_msat += htlc.amount_msat;
1240 log_trace!(logger, " ...not including outbound HTLC {} (hash {}) with value {} due to state ({})", htlc.htlc_id, log_bytes!(htlc.payment_hash.0), htlc.amount_msat, state_name);
1242 OutboundHTLCState::AwaitingRemoteRevokeToRemove(None)|OutboundHTLCState::AwaitingRemovedRemoteRevoke(None) => {
1243 value_to_self_msat_offset -= htlc.amount_msat as i64;
1245 OutboundHTLCState::RemoteRemoved(None) => {
1246 if !generated_by_local {
1247 value_to_self_msat_offset -= htlc.amount_msat as i64;
1255 let mut value_to_self_msat: i64 = (self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset;
1256 assert!(value_to_self_msat >= 0);
1257 // Note that in case they have several just-awaiting-last-RAA fulfills in-progress (ie
1258 // AwaitingRemoteRevokeToRemove or AwaitingRemovedRemoteRevoke) we may have allowed them to
1259 // "violate" their reserve value by couting those against it. Thus, we have to convert
1260 // everything to i64 before subtracting as otherwise we can overflow.
1261 let mut value_to_remote_msat: i64 = (self.channel_value_satoshis * 1000) as i64 - (self.value_to_self_msat as i64) - (remote_htlc_total_msat as i64) - value_to_self_msat_offset;
1262 assert!(value_to_remote_msat >= 0);
1264 #[cfg(debug_assertions)]
1266 // Make sure that the to_self/to_remote is always either past the appropriate
1267 // channel_reserve *or* it is making progress towards it.
1268 let mut broadcaster_max_commitment_tx_output = if generated_by_local {
1269 self.holder_max_commitment_tx_output.lock().unwrap()
1271 self.counterparty_max_commitment_tx_output.lock().unwrap()
1273 debug_assert!(broadcaster_max_commitment_tx_output.0 <= value_to_self_msat as u64 || value_to_self_msat / 1000 >= self.counterparty_selected_channel_reserve_satoshis.unwrap() as i64);
1274 broadcaster_max_commitment_tx_output.0 = cmp::max(broadcaster_max_commitment_tx_output.0, value_to_self_msat as u64);
1275 debug_assert!(broadcaster_max_commitment_tx_output.1 <= value_to_remote_msat as u64 || value_to_remote_msat / 1000 >= Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) as i64);
1276 broadcaster_max_commitment_tx_output.1 = cmp::max(broadcaster_max_commitment_tx_output.1, value_to_remote_msat as u64);
1279 let total_fee_sat = Channel::<Signer>::commit_tx_fee_sat(feerate_per_kw, included_non_dust_htlcs.len());
1280 let (value_to_self, value_to_remote) = if self.is_outbound() {
1281 (value_to_self_msat / 1000 - total_fee_sat as i64, value_to_remote_msat / 1000)
1283 (value_to_self_msat / 1000, value_to_remote_msat / 1000 - total_fee_sat as i64)
1286 let mut value_to_a = if local { value_to_self } else { value_to_remote };
1287 let mut value_to_b = if local { value_to_remote } else { value_to_self };
1288 let (funding_pubkey_a, funding_pubkey_b) = if local {
1289 (self.get_holder_pubkeys().funding_pubkey, self.get_counterparty_pubkeys().funding_pubkey)
1291 (self.get_counterparty_pubkeys().funding_pubkey, self.get_holder_pubkeys().funding_pubkey)
1294 if value_to_a >= (broadcaster_dust_limit_satoshis as i64) {
1295 log_trace!(logger, " ...including {} output with value {}", if local { "to_local" } else { "to_remote" }, value_to_a);
1300 if value_to_b >= (broadcaster_dust_limit_satoshis as i64) {
1301 log_trace!(logger, " ...including {} output with value {}", if local { "to_remote" } else { "to_local" }, value_to_b);
1306 let num_nondust_htlcs = included_non_dust_htlcs.len();
1308 let channel_parameters =
1309 if local { self.channel_transaction_parameters.as_holder_broadcastable() }
1310 else { self.channel_transaction_parameters.as_counterparty_broadcastable() };
1311 let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(commitment_number,
1319 &mut included_non_dust_htlcs,
1322 let mut htlcs_included = included_non_dust_htlcs;
1323 // The unwrap is safe, because all non-dust HTLCs have been assigned an output index
1324 htlcs_included.sort_unstable_by_key(|h| h.0.transaction_output_index.unwrap());
1325 htlcs_included.append(&mut included_dust_htlcs);
1327 // For the stats, trimmed-to-0 the value in msats accordingly
1328 value_to_self_msat = if (value_to_self_msat * 1000) < broadcaster_dust_limit_satoshis as i64 { 0 } else { value_to_self_msat };
1329 value_to_remote_msat = if (value_to_remote_msat * 1000) < broadcaster_dust_limit_satoshis as i64 { 0 } else { value_to_remote_msat };
1337 local_balance_msat: value_to_self_msat as u64,
1338 remote_balance_msat: value_to_remote_msat as u64,
1343 fn get_closing_scriptpubkey(&self) -> Script {
1344 // The shutdown scriptpubkey is set on channel opening when option_upfront_shutdown_script
1345 // is signaled. Otherwise, it is set when sending a shutdown message. Calling this method
1346 // outside of those situations will fail.
1347 self.shutdown_scriptpubkey.clone().unwrap().into_inner()
1351 fn get_closing_transaction_weight(&self, a_scriptpubkey: Option<&Script>, b_scriptpubkey: Option<&Script>) -> u64 {
1356 1 + // script length (0)
1360 )*4 + // * 4 for non-witness parts
1361 2 + // witness marker and flag
1362 1 + // witness element count
1363 4 + // 4 element lengths (2 sigs, multisig dummy, and witness script)
1364 self.get_funding_redeemscript().len() as u64 + // funding witness script
1365 2*(1 + 71); // two signatures + sighash type flags
1366 if let Some(spk) = a_scriptpubkey {
1367 ret += ((8+1) + // output values and script length
1368 spk.len() as u64) * 4; // scriptpubkey and witness multiplier
1370 if let Some(spk) = b_scriptpubkey {
1371 ret += ((8+1) + // output values and script length
1372 spk.len() as u64) * 4; // scriptpubkey and witness multiplier
1378 fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (ClosingTransaction, u64) {
1379 assert!(self.pending_inbound_htlcs.is_empty());
1380 assert!(self.pending_outbound_htlcs.is_empty());
1381 assert!(self.pending_update_fee.is_none());
1383 let mut total_fee_satoshis = proposed_total_fee_satoshis;
1384 let mut value_to_holder: i64 = (self.value_to_self_msat as i64) / 1000 - if self.is_outbound() { total_fee_satoshis as i64 } else { 0 };
1385 let mut value_to_counterparty: i64 = ((self.channel_value_satoshis * 1000 - self.value_to_self_msat) as i64 / 1000) - if self.is_outbound() { 0 } else { total_fee_satoshis as i64 };
1387 if value_to_holder < 0 {
1388 assert!(self.is_outbound());
1389 total_fee_satoshis += (-value_to_holder) as u64;
1390 } else if value_to_counterparty < 0 {
1391 assert!(!self.is_outbound());
1392 total_fee_satoshis += (-value_to_counterparty) as u64;
1395 if skip_remote_output || value_to_counterparty as u64 <= self.holder_dust_limit_satoshis {
1396 value_to_counterparty = 0;
1399 if value_to_holder as u64 <= self.holder_dust_limit_satoshis {
1400 value_to_holder = 0;
1403 assert!(self.shutdown_scriptpubkey.is_some());
1404 let holder_shutdown_script = self.get_closing_scriptpubkey();
1405 let counterparty_shutdown_script = self.counterparty_shutdown_scriptpubkey.clone().unwrap();
1406 let funding_outpoint = self.funding_outpoint().into_bitcoin_outpoint();
1408 let closing_transaction = ClosingTransaction::new(value_to_holder as u64, value_to_counterparty as u64, holder_shutdown_script, counterparty_shutdown_script, funding_outpoint);
1409 (closing_transaction, total_fee_satoshis)
1412 fn funding_outpoint(&self) -> OutPoint {
1413 self.channel_transaction_parameters.funding_outpoint.unwrap()
1417 /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
1418 /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
1419 /// our counterparty!)
1420 /// The result is a transaction which we can revoke broadcastership of (ie a "local" transaction)
1421 /// TODO Some magic rust shit to compile-time check this?
1422 fn build_holder_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, ChannelError> {
1423 let per_commitment_point = self.holder_signer.get_per_commitment_point(commitment_number, &self.secp_ctx);
1424 let delayed_payment_base = &self.get_holder_pubkeys().delayed_payment_basepoint;
1425 let htlc_basepoint = &self.get_holder_pubkeys().htlc_basepoint;
1426 let counterparty_pubkeys = self.get_counterparty_pubkeys();
1428 Ok(secp_check!(TxCreationKeys::derive_new(&self.secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &counterparty_pubkeys.revocation_basepoint, &counterparty_pubkeys.htlc_basepoint), "Local tx keys generation got bogus keys".to_owned()))
1432 /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
1433 /// will sign and send to our counterparty.
1434 /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
1435 fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, ChannelError> {
1436 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
1437 //may see payments to it!
1438 let revocation_basepoint = &self.get_holder_pubkeys().revocation_basepoint;
1439 let htlc_basepoint = &self.get_holder_pubkeys().htlc_basepoint;
1440 let counterparty_pubkeys = self.get_counterparty_pubkeys();
1442 Ok(secp_check!(TxCreationKeys::derive_new(&self.secp_ctx, &self.counterparty_cur_commitment_point.unwrap(), &counterparty_pubkeys.delayed_payment_basepoint, &counterparty_pubkeys.htlc_basepoint, revocation_basepoint, htlc_basepoint), "Remote tx keys generation got bogus keys".to_owned()))
1445 /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
1446 /// pays to get_funding_redeemscript().to_v0_p2wsh()).
1447 /// Panics if called before accept_channel/new_from_req
1448 pub fn get_funding_redeemscript(&self) -> Script {
1449 make_funding_redeemscript(&self.get_holder_pubkeys().funding_pubkey, self.counterparty_funding_pubkey())
1452 fn get_update_fulfill_htlc<L: Deref>(&mut self, htlc_id_arg: u64, payment_preimage_arg: PaymentPreimage, logger: &L) -> UpdateFulfillFetch where L::Target: Logger {
1453 // Either ChannelFunded got set (which means it won't be unset) or there is no way any
1454 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1455 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1457 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1458 panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1460 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1462 let payment_hash_calc = PaymentHash(Sha256::hash(&payment_preimage_arg.0[..]).into_inner());
1464 // ChannelManager may generate duplicate claims/fails due to HTLC update events from
1465 // on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
1466 // these, but for now we just have to treat them as normal.
1468 let mut pending_idx = core::usize::MAX;
1469 let mut htlc_value_msat = 0;
1470 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1471 if htlc.htlc_id == htlc_id_arg {
1472 assert_eq!(htlc.payment_hash, payment_hash_calc);
1474 InboundHTLCState::Committed => {},
1475 InboundHTLCState::LocalRemoved(ref reason) => {
1476 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1478 log_warn!(logger, "Have preimage and want to fulfill HTLC with payment hash {} we already failed against channel {}", log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id()));
1479 debug_assert!(false, "Tried to fulfill an HTLC that was already failed");
1481 return UpdateFulfillFetch::DuplicateClaim {};
1484 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1485 // Don't return in release mode here so that we can update channel_monitor
1489 htlc_value_msat = htlc.amount_msat;
1493 if pending_idx == core::usize::MAX {
1494 #[cfg(any(test, feature = "fuzztarget"))]
1495 // If we failed to find an HTLC to fulfill, make sure it was previously fulfilled and
1496 // this is simply a duplicate claim, not previously failed and we lost funds.
1497 debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
1498 return UpdateFulfillFetch::DuplicateClaim {};
1501 // Now update local state:
1503 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1504 // can claim it even if the channel hits the chain before we see their next commitment.
1505 self.latest_monitor_update_id += 1;
1506 let monitor_update = ChannelMonitorUpdate {
1507 update_id: self.latest_monitor_update_id,
1508 updates: vec![ChannelMonitorUpdateStep::PaymentPreimage {
1509 payment_preimage: payment_preimage_arg.clone(),
1513 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1514 for pending_update in self.holding_cell_htlc_updates.iter() {
1515 match pending_update {
1516 &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1517 if htlc_id_arg == htlc_id {
1518 // Make sure we don't leave latest_monitor_update_id incremented here:
1519 self.latest_monitor_update_id -= 1;
1520 #[cfg(any(test, feature = "fuzztarget"))]
1521 debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
1522 return UpdateFulfillFetch::DuplicateClaim {};
1525 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1526 if htlc_id_arg == htlc_id {
1527 log_warn!(logger, "Have preimage and want to fulfill HTLC with pending failure against channel {}", log_bytes!(self.channel_id()));
1528 // TODO: We may actually be able to switch to a fulfill here, though its
1529 // rare enough it may not be worth the complexity burden.
1530 debug_assert!(false, "Tried to fulfill an HTLC that was already failed");
1531 return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
1537 log_trace!(logger, "Adding HTLC claim to holding_cell in channel {}! Current state: {}", log_bytes!(self.channel_id()), self.channel_state);
1538 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1539 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1541 #[cfg(any(test, feature = "fuzztarget"))]
1542 self.historical_inbound_htlc_fulfills.insert(htlc_id_arg);
1543 return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
1545 #[cfg(any(test, feature = "fuzztarget"))]
1546 self.historical_inbound_htlc_fulfills.insert(htlc_id_arg);
1549 let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1550 if let InboundHTLCState::Committed = htlc.state {
1552 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1553 return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
1555 log_trace!(logger, "Upgrading HTLC {} to LocalRemoved with a Fulfill in channel {}!", log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
1556 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(payment_preimage_arg.clone()));
1559 UpdateFulfillFetch::NewClaim {
1562 msg: Some(msgs::UpdateFulfillHTLC {
1563 channel_id: self.channel_id(),
1564 htlc_id: htlc_id_arg,
1565 payment_preimage: payment_preimage_arg,
1570 pub fn get_update_fulfill_htlc_and_commit<L: Deref>(&mut self, htlc_id: u64, payment_preimage: PaymentPreimage, logger: &L) -> Result<UpdateFulfillCommitFetch, (ChannelError, ChannelMonitorUpdate)> where L::Target: Logger {
1571 match self.get_update_fulfill_htlc(htlc_id, payment_preimage, logger) {
1572 UpdateFulfillFetch::NewClaim { mut monitor_update, htlc_value_msat, msg: Some(update_fulfill_htlc) } => {
1573 let (commitment, mut additional_update) = match self.send_commitment_no_status_check(logger) {
1574 Err(e) => return Err((e, monitor_update)),
1577 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
1578 // strictly increasing by one, so decrement it here.
1579 self.latest_monitor_update_id = monitor_update.update_id;
1580 monitor_update.updates.append(&mut additional_update.updates);
1581 Ok(UpdateFulfillCommitFetch::NewClaim { monitor_update, htlc_value_msat, msgs: Some((update_fulfill_htlc, commitment)) })
1583 UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None } =>
1584 Ok(UpdateFulfillCommitFetch::NewClaim { monitor_update, htlc_value_msat, msgs: None }),
1585 UpdateFulfillFetch::DuplicateClaim {} => Ok(UpdateFulfillCommitFetch::DuplicateClaim {}),
1589 /// We can only have one resolution per HTLC. In some cases around reconnect, we may fulfill
1590 /// an HTLC more than once or fulfill once and then attempt to fail after reconnect. We cannot,
1591 /// however, fail more than once as we wait for an upstream failure to be irrevocably committed
1592 /// before we fail backwards.
1593 /// If we do fail twice, we debug_assert!(false) and return Ok(None). Thus, will always return
1594 /// Ok(_) if debug assertions are turned on or preconditions are met.
1595 pub fn get_update_fail_htlc<L: Deref>(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket, logger: &L) -> Result<Option<msgs::UpdateFailHTLC>, ChannelError> where L::Target: Logger {
1596 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1597 panic!("Was asked to fail an HTLC when channel was not in an operational state");
1599 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1601 // ChannelManager may generate duplicate claims/fails due to HTLC update events from
1602 // on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
1603 // these, but for now we just have to treat them as normal.
1605 let mut pending_idx = core::usize::MAX;
1606 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1607 if htlc.htlc_id == htlc_id_arg {
1609 InboundHTLCState::Committed => {},
1610 InboundHTLCState::LocalRemoved(ref reason) => {
1611 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1613 debug_assert!(false, "Tried to fail an HTLC that was already failed");
1618 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1619 return Err(ChannelError::Ignore(format!("Unable to find a pending HTLC which matched the given HTLC ID ({})", htlc.htlc_id)));
1625 if pending_idx == core::usize::MAX {
1626 #[cfg(any(test, feature = "fuzztarget"))]
1627 // If we failed to find an HTLC to fail, make sure it was previously fulfilled and this
1628 // is simply a duplicate fail, not previously failed and we failed-back too early.
1629 debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
1633 // Now update local state:
1634 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1635 for pending_update in self.holding_cell_htlc_updates.iter() {
1636 match pending_update {
1637 &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1638 if htlc_id_arg == htlc_id {
1639 #[cfg(any(test, feature = "fuzztarget"))]
1640 debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
1644 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1645 if htlc_id_arg == htlc_id {
1646 debug_assert!(false, "Tried to fail an HTLC that was already failed");
1647 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
1653 log_trace!(logger, "Placing failure for HTLC ID {} in holding cell in channel {}.", htlc_id_arg, log_bytes!(self.channel_id()));
1654 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1655 htlc_id: htlc_id_arg,
1661 log_trace!(logger, "Failing HTLC ID {} back with a update_fail_htlc message in channel {}.", htlc_id_arg, log_bytes!(self.channel_id()));
1663 let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1664 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(err_packet.clone()));
1667 Ok(Some(msgs::UpdateFailHTLC {
1668 channel_id: self.channel_id(),
1669 htlc_id: htlc_id_arg,
1674 // Message handlers:
1676 pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel, config: &UserConfig, their_features: &InitFeatures) -> Result<(), ChannelError> {
1677 // Check sanity of message fields:
1678 if !self.is_outbound() {
1679 return Err(ChannelError::Close("Got an accept_channel message from an inbound peer".to_owned()));
1681 if self.channel_state != ChannelState::OurInitSent as u32 {
1682 return Err(ChannelError::Close("Got an accept_channel message at a strange time".to_owned()));
1684 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1685 return Err(ChannelError::Close(format!("Peer never wants payout outputs? dust_limit_satoshis was {}", msg.dust_limit_satoshis)));
1687 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1688 return Err(ChannelError::Close(format!("Bogus channel_reserve_satoshis ({}). Must not be greater than ({})", msg.channel_reserve_satoshis, self.channel_value_satoshis)));
1690 if msg.channel_reserve_satoshis < self.holder_dust_limit_satoshis {
1691 return Err(ChannelError::Close(format!("Peer never wants payout outputs? channel_reserve_satoshis was ({}). dust_limit is ({})", msg.channel_reserve_satoshis, self.holder_dust_limit_satoshis)));
1693 let remote_reserve = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis);
1694 if msg.dust_limit_satoshis > remote_reserve {
1695 return Err(ChannelError::Close(format!("Dust limit ({}) is bigger than our channel reserve ({})", msg.dust_limit_satoshis, remote_reserve)));
1697 let full_channel_value_msat = (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000;
1698 if msg.htlc_minimum_msat >= full_channel_value_msat {
1699 return Err(ChannelError::Close(format!("Minimum htlc value ({}) is full channel value ({})", msg.htlc_minimum_msat, full_channel_value_msat)));
1701 let max_delay_acceptable = u16::min(config.peer_channel_config_limits.their_to_self_delay, MAX_LOCAL_BREAKDOWN_TIMEOUT);
1702 if msg.to_self_delay > max_delay_acceptable {
1703 return Err(ChannelError::Close(format!("They wanted our payments to be delayed by a needlessly long period. Upper limit: {}. Actual: {}", max_delay_acceptable, msg.to_self_delay)));
1705 if msg.max_accepted_htlcs < 1 {
1706 return Err(ChannelError::Close("0 max_accepted_htlcs makes for a useless channel".to_owned()));
1708 if msg.max_accepted_htlcs > MAX_HTLCS {
1709 return Err(ChannelError::Close(format!("max_accepted_htlcs was {}. It must not be larger than {}", msg.max_accepted_htlcs, MAX_HTLCS)));
1712 // Now check against optional parameters as set by config...
1713 if msg.htlc_minimum_msat > config.peer_channel_config_limits.max_htlc_minimum_msat {
1714 return Err(ChannelError::Close(format!("htlc_minimum_msat ({}) is higher than the user specified limit ({})", msg.htlc_minimum_msat, config.peer_channel_config_limits.max_htlc_minimum_msat)));
1716 if msg.max_htlc_value_in_flight_msat < config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat {
1717 return Err(ChannelError::Close(format!("max_htlc_value_in_flight_msat ({}) is less than the user specified limit ({})", msg.max_htlc_value_in_flight_msat, config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat)));
1719 if msg.channel_reserve_satoshis > config.peer_channel_config_limits.max_channel_reserve_satoshis {
1720 return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is higher than the user specified limit ({})", msg.channel_reserve_satoshis, config.peer_channel_config_limits.max_channel_reserve_satoshis)));
1722 if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
1723 return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs)));
1725 if msg.dust_limit_satoshis < MIN_CHAN_DUST_LIMIT_SATOSHIS {
1726 return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_CHAN_DUST_LIMIT_SATOSHIS)));
1728 if msg.dust_limit_satoshis > MAX_CHAN_DUST_LIMIT_SATOSHIS {
1729 return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_CHAN_DUST_LIMIT_SATOSHIS)));
1731 if msg.minimum_depth > config.peer_channel_config_limits.max_minimum_depth {
1732 return Err(ChannelError::Close(format!("We consider the minimum depth to be unreasonably large. Expected minimum: ({}). Actual: ({})", config.peer_channel_config_limits.max_minimum_depth, msg.minimum_depth)));
1734 if msg.minimum_depth == 0 {
1735 // Note that if this changes we should update the serialization minimum version to
1736 // indicate to older clients that they don't understand some features of the current
1738 return Err(ChannelError::Close("Minimum confirmation depth must be at least 1".to_owned()));
1741 let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
1742 match &msg.shutdown_scriptpubkey {
1743 &OptionalField::Present(ref script) => {
1744 // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
1745 if script.len() == 0 {
1748 if !script::is_bolt2_compliant(&script, their_features) {
1749 return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script)));
1751 Some(script.clone())
1754 // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
1755 &OptionalField::Absent => {
1756 return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out".to_owned()));
1761 self.counterparty_dust_limit_satoshis = msg.dust_limit_satoshis;
1762 self.counterparty_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1763 self.counterparty_selected_channel_reserve_satoshis = Some(msg.channel_reserve_satoshis);
1764 self.counterparty_htlc_minimum_msat = msg.htlc_minimum_msat;
1765 self.counterparty_max_accepted_htlcs = msg.max_accepted_htlcs;
1766 self.minimum_depth = Some(msg.minimum_depth);
1768 let counterparty_pubkeys = ChannelPublicKeys {
1769 funding_pubkey: msg.funding_pubkey,
1770 revocation_basepoint: msg.revocation_basepoint,
1771 payment_point: msg.payment_point,
1772 delayed_payment_basepoint: msg.delayed_payment_basepoint,
1773 htlc_basepoint: msg.htlc_basepoint
1776 self.channel_transaction_parameters.counterparty_parameters = Some(CounterpartyChannelTransactionParameters {
1777 selected_contest_delay: msg.to_self_delay,
1778 pubkeys: counterparty_pubkeys,
1781 self.counterparty_cur_commitment_point = Some(msg.first_per_commitment_point);
1782 self.counterparty_shutdown_scriptpubkey = counterparty_shutdown_scriptpubkey;
1784 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1789 fn funding_created_signature<L: Deref>(&mut self, sig: &Signature, logger: &L) -> Result<(Txid, CommitmentTransaction, Signature), ChannelError> where L::Target: Logger {
1790 let funding_script = self.get_funding_redeemscript();
1792 let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number)?;
1793 let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, logger).tx;
1795 let trusted_tx = initial_commitment_tx.trust();
1796 let initial_commitment_bitcoin_tx = trusted_tx.built_transaction();
1797 let sighash = initial_commitment_bitcoin_tx.get_sighash_all(&funding_script, self.channel_value_satoshis);
1798 // They sign the holder commitment transaction...
1799 log_trace!(logger, "Checking funding_created tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} for channel {}.",
1800 log_bytes!(sig.serialize_compact()[..]), log_bytes!(self.counterparty_funding_pubkey().serialize()),
1801 encode::serialize_hex(&initial_commitment_bitcoin_tx.transaction), log_bytes!(sighash[..]),
1802 encode::serialize_hex(&funding_script), log_bytes!(self.channel_id()));
1803 secp_check!(self.secp_ctx.verify(&sighash, &sig, self.counterparty_funding_pubkey()), "Invalid funding_created signature from peer".to_owned());
1806 let counterparty_keys = self.build_remote_transaction_keys()?;
1807 let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).tx;
1809 let counterparty_trusted_tx = counterparty_initial_commitment_tx.trust();
1810 let counterparty_initial_bitcoin_tx = counterparty_trusted_tx.built_transaction();
1811 log_trace!(logger, "Initial counterparty tx for channel {} is: txid {} tx {}",
1812 log_bytes!(self.channel_id()), counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
1814 let counterparty_signature = self.holder_signer.sign_counterparty_commitment(&counterparty_initial_commitment_tx, &self.secp_ctx)
1815 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed".to_owned()))?.0;
1817 // We sign "counterparty" commitment transaction, allowing them to broadcast the tx if they wish.
1818 Ok((counterparty_initial_bitcoin_tx.txid, initial_commitment_tx, counterparty_signature))
1821 fn counterparty_funding_pubkey(&self) -> &PublicKey {
1822 &self.get_counterparty_pubkeys().funding_pubkey
1825 pub fn funding_created<L: Deref>(&mut self, msg: &msgs::FundingCreated, best_block: BestBlock, logger: &L) -> Result<(msgs::FundingSigned, ChannelMonitor<Signer>), ChannelError> where L::Target: Logger {
1826 if self.is_outbound() {
1827 return Err(ChannelError::Close("Received funding_created for an outbound channel?".to_owned()));
1829 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1830 // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1831 // remember the channel, so it's safe to just send an error_message here and drop the
1833 return Err(ChannelError::Close("Received funding_created after we got the channel!".to_owned()));
1835 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
1836 self.cur_counterparty_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1837 self.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1838 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1841 let funding_txo = OutPoint { txid: msg.funding_txid, index: msg.funding_output_index };
1842 self.channel_transaction_parameters.funding_outpoint = Some(funding_txo);
1843 // This is an externally observable change before we finish all our checks. In particular
1844 // funding_created_signature may fail.
1845 self.holder_signer.ready_channel(&self.channel_transaction_parameters);
1847 let (counterparty_initial_commitment_txid, initial_commitment_tx, signature) = match self.funding_created_signature(&msg.signature, logger) {
1849 Err(ChannelError::Close(e)) => {
1850 self.channel_transaction_parameters.funding_outpoint = None;
1851 return Err(ChannelError::Close(e));
1854 // The only error we know how to handle is ChannelError::Close, so we fall over here
1855 // to make sure we don't continue with an inconsistent state.
1856 panic!("unexpected error type from funding_created_signature {:?}", e);
1860 let holder_commitment_tx = HolderCommitmentTransaction::new(
1861 initial_commitment_tx,
1864 &self.get_holder_pubkeys().funding_pubkey,
1865 self.counterparty_funding_pubkey()
1868 self.holder_signer.validate_holder_commitment(&holder_commitment_tx)
1869 .map_err(|_| ChannelError::Close("Failed to validate our commitment".to_owned()))?;
1871 // Now that we're past error-generating stuff, update our local state:
1873 let funding_redeemscript = self.get_funding_redeemscript();
1874 let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
1875 let obscure_factor = get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound());
1876 let shutdown_script = self.shutdown_scriptpubkey.clone().map(|script| script.into_inner());
1877 let channel_monitor = ChannelMonitor::new(self.secp_ctx.clone(), self.holder_signer.clone(),
1878 shutdown_script, self.get_holder_selected_contest_delay(),
1879 &self.destination_script, (funding_txo, funding_txo_script.clone()),
1880 &self.channel_transaction_parameters,
1881 funding_redeemscript.clone(), self.channel_value_satoshis,
1883 holder_commitment_tx, best_block);
1885 channel_monitor.provide_latest_counterparty_commitment_tx(counterparty_initial_commitment_txid, Vec::new(), self.cur_counterparty_commitment_transaction_number, self.counterparty_cur_commitment_point.unwrap(), logger);
1887 self.channel_state = ChannelState::FundingSent as u32;
1888 self.channel_id = funding_txo.to_channel_id();
1889 self.cur_counterparty_commitment_transaction_number -= 1;
1890 self.cur_holder_commitment_transaction_number -= 1;
1892 log_info!(logger, "Generated funding_signed for peer for channel {}", log_bytes!(self.channel_id()));
1894 Ok((msgs::FundingSigned {
1895 channel_id: self.channel_id,
1897 }, channel_monitor))
1900 /// Handles a funding_signed message from the remote end.
1901 /// If this call is successful, broadcast the funding transaction (and not before!)
1902 pub fn funding_signed<L: Deref>(&mut self, msg: &msgs::FundingSigned, best_block: BestBlock, logger: &L) -> Result<(ChannelMonitor<Signer>, Transaction), ChannelError> where L::Target: Logger {
1903 if !self.is_outbound() {
1904 return Err(ChannelError::Close("Received funding_signed for an inbound channel?".to_owned()));
1906 if self.channel_state & !(ChannelState::MonitorUpdateFailed as u32) != ChannelState::FundingCreated as u32 {
1907 return Err(ChannelError::Close("Received funding_signed in strange state!".to_owned()));
1909 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
1910 self.cur_counterparty_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1911 self.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1912 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1915 let funding_script = self.get_funding_redeemscript();
1917 let counterparty_keys = self.build_remote_transaction_keys()?;
1918 let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).tx;
1919 let counterparty_trusted_tx = counterparty_initial_commitment_tx.trust();
1920 let counterparty_initial_bitcoin_tx = counterparty_trusted_tx.built_transaction();
1922 log_trace!(logger, "Initial counterparty tx for channel {} is: txid {} tx {}",
1923 log_bytes!(self.channel_id()), counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
1925 let holder_signer = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number)?;
1926 let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &holder_signer, true, false, logger).tx;
1928 let trusted_tx = initial_commitment_tx.trust();
1929 let initial_commitment_bitcoin_tx = trusted_tx.built_transaction();
1930 let sighash = initial_commitment_bitcoin_tx.get_sighash_all(&funding_script, self.channel_value_satoshis);
1931 // They sign our commitment transaction, allowing us to broadcast the tx if we wish.
1932 if let Err(_) = self.secp_ctx.verify(&sighash, &msg.signature, &self.get_counterparty_pubkeys().funding_pubkey) {
1933 return Err(ChannelError::Close("Invalid funding_signed signature from peer".to_owned()));
1937 let holder_commitment_tx = HolderCommitmentTransaction::new(
1938 initial_commitment_tx,
1941 &self.get_holder_pubkeys().funding_pubkey,
1942 self.counterparty_funding_pubkey()
1945 self.holder_signer.validate_holder_commitment(&holder_commitment_tx)
1946 .map_err(|_| ChannelError::Close("Failed to validate our commitment".to_owned()))?;
1949 let funding_redeemscript = self.get_funding_redeemscript();
1950 let funding_txo = self.get_funding_txo().unwrap();
1951 let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
1952 let obscure_factor = get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound());
1953 let shutdown_script = self.shutdown_scriptpubkey.clone().map(|script| script.into_inner());
1954 let channel_monitor = ChannelMonitor::new(self.secp_ctx.clone(), self.holder_signer.clone(),
1955 shutdown_script, self.get_holder_selected_contest_delay(),
1956 &self.destination_script, (funding_txo, funding_txo_script),
1957 &self.channel_transaction_parameters,
1958 funding_redeemscript.clone(), self.channel_value_satoshis,
1960 holder_commitment_tx, best_block);
1962 channel_monitor.provide_latest_counterparty_commitment_tx(counterparty_initial_bitcoin_tx.txid, Vec::new(), self.cur_counterparty_commitment_transaction_number, self.counterparty_cur_commitment_point.unwrap(), logger);
1964 assert_eq!(self.channel_state & (ChannelState::MonitorUpdateFailed as u32), 0); // We have no had any monitor(s) yet to fail update!
1965 self.channel_state = ChannelState::FundingSent as u32;
1966 self.cur_holder_commitment_transaction_number -= 1;
1967 self.cur_counterparty_commitment_transaction_number -= 1;
1969 log_info!(logger, "Received funding_signed from peer for channel {}", log_bytes!(self.channel_id()));
1971 Ok((channel_monitor, self.funding_transaction.as_ref().cloned().unwrap()))
1974 pub fn funding_locked<L: Deref>(&mut self, msg: &msgs::FundingLocked, logger: &L) -> Result<(), ChannelError> where L::Target: Logger {
1975 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1976 self.workaround_lnd_bug_4006 = Some(msg.clone());
1977 return Err(ChannelError::Ignore("Peer sent funding_locked when we needed a channel_reestablish. The peer is likely lnd, see https://github.com/lightningnetwork/lnd/issues/4006".to_owned()));
1980 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
1982 if non_shutdown_state == ChannelState::FundingSent as u32 {
1983 self.channel_state |= ChannelState::TheirFundingLocked as u32;
1984 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1985 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
1986 self.update_time_counter += 1;
1987 } else if (self.channel_state & (ChannelState::ChannelFunded as u32) != 0 &&
1988 // Note that funding_signed/funding_created will have decremented both by 1!
1989 self.cur_holder_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 &&
1990 self.cur_counterparty_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1) ||
1991 // If we reconnected before sending our funding locked they may still resend theirs:
1992 (self.channel_state & (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) ==
1993 (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32)) {
1994 if self.counterparty_cur_commitment_point != Some(msg.next_per_commitment_point) {
1995 return Err(ChannelError::Close("Peer sent a reconnect funding_locked with a different point".to_owned()));
1997 // They probably disconnected/reconnected and re-sent the funding_locked, which is required
2000 return Err(ChannelError::Close("Peer sent a funding_locked at a strange time".to_owned()));
2003 self.counterparty_prev_commitment_point = self.counterparty_cur_commitment_point;
2004 self.counterparty_cur_commitment_point = Some(msg.next_per_commitment_point);
2006 log_info!(logger, "Received funding_locked from peer for channel {}", log_bytes!(self.channel_id()));
2011 /// Returns transaction if there is pending funding transaction that is yet to broadcast
2012 pub fn unbroadcasted_funding(&self) -> Option<Transaction> {
2013 if self.channel_state & (ChannelState::FundingCreated as u32) != 0 {
2014 self.funding_transaction.clone()
2020 /// Returns a HTLCStats about inbound pending htlcs
2021 fn get_inbound_pending_htlc_stats(&self, outbound_feerate_update: Option<u32>) -> HTLCStats {
2022 let mut stats = HTLCStats {
2023 pending_htlcs: self.pending_inbound_htlcs.len() as u32,
2024 pending_htlcs_value_msat: 0,
2025 on_counterparty_tx_dust_exposure_msat: 0,
2026 on_holder_tx_dust_exposure_msat: 0,
2027 holding_cell_msat: 0,
2028 on_holder_tx_holding_cell_htlcs_count: 0,
2031 let counterparty_dust_limit_timeout_sat = (self.get_dust_buffer_feerate(outbound_feerate_update) as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
2032 let holder_dust_limit_success_sat = (self.get_dust_buffer_feerate(outbound_feerate_update) as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
2033 for ref htlc in self.pending_inbound_htlcs.iter() {
2034 stats.pending_htlcs_value_msat += htlc.amount_msat;
2035 if htlc.amount_msat / 1000 < counterparty_dust_limit_timeout_sat {
2036 stats.on_counterparty_tx_dust_exposure_msat += htlc.amount_msat;
2038 if htlc.amount_msat / 1000 < holder_dust_limit_success_sat {
2039 stats.on_holder_tx_dust_exposure_msat += htlc.amount_msat;
2045 /// Returns a HTLCStats about pending outbound htlcs, *including* pending adds in our holding cell.
2046 fn get_outbound_pending_htlc_stats(&self, outbound_feerate_update: Option<u32>) -> HTLCStats {
2047 let mut stats = HTLCStats {
2048 pending_htlcs: self.pending_outbound_htlcs.len() as u32,
2049 pending_htlcs_value_msat: 0,
2050 on_counterparty_tx_dust_exposure_msat: 0,
2051 on_holder_tx_dust_exposure_msat: 0,
2052 holding_cell_msat: 0,
2053 on_holder_tx_holding_cell_htlcs_count: 0,
2056 let counterparty_dust_limit_success_sat = (self.get_dust_buffer_feerate(outbound_feerate_update) as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
2057 let holder_dust_limit_timeout_sat = (self.get_dust_buffer_feerate(outbound_feerate_update) as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
2058 for ref htlc in self.pending_outbound_htlcs.iter() {
2059 stats.pending_htlcs_value_msat += htlc.amount_msat;
2060 if htlc.amount_msat / 1000 < counterparty_dust_limit_success_sat {
2061 stats.on_counterparty_tx_dust_exposure_msat += htlc.amount_msat;
2063 if htlc.amount_msat / 1000 < holder_dust_limit_timeout_sat {
2064 stats.on_holder_tx_dust_exposure_msat += htlc.amount_msat;
2068 for update in self.holding_cell_htlc_updates.iter() {
2069 if let &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, .. } = update {
2070 stats.pending_htlcs += 1;
2071 stats.pending_htlcs_value_msat += amount_msat;
2072 stats.holding_cell_msat += amount_msat;
2073 if *amount_msat / 1000 < counterparty_dust_limit_success_sat {
2074 stats.on_counterparty_tx_dust_exposure_msat += amount_msat;
2076 if *amount_msat / 1000 < holder_dust_limit_timeout_sat {
2077 stats.on_holder_tx_dust_exposure_msat += amount_msat;
2079 stats.on_holder_tx_holding_cell_htlcs_count += 1;
2086 /// Get the available (ie not including pending HTLCs) inbound and outbound balance in msat.
2087 /// Doesn't bother handling the
2088 /// if-we-removed-it-already-but-haven't-fully-resolved-they-can-still-send-an-inbound-HTLC
2089 /// corner case properly.
2090 pub fn get_inbound_outbound_available_balance_msat(&self) -> (u64, u64) {
2091 // Note that we have to handle overflow due to the above case.
2093 cmp::max(self.channel_value_satoshis as i64 * 1000
2094 - self.value_to_self_msat as i64
2095 - self.get_inbound_pending_htlc_stats(None).pending_htlcs_value_msat as i64
2096 - Self::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) as i64 * 1000,
2098 cmp::max(self.value_to_self_msat as i64
2099 - self.get_outbound_pending_htlc_stats(None).pending_htlcs_value_msat as i64
2100 - self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0) as i64 * 1000,
2105 pub fn get_holder_counterparty_selected_channel_reserve_satoshis(&self) -> (u64, Option<u64>) {
2106 (Self::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis),
2107 self.counterparty_selected_channel_reserve_satoshis)
2110 // Get the fee cost in MSATS of a commitment tx with a given number of HTLC outputs.
2111 // Note that num_htlcs should not include dust HTLCs.
2112 fn commit_tx_fee_msat(feerate_per_kw: u32, num_htlcs: usize) -> u64 {
2113 // Note that we need to divide before multiplying to round properly,
2114 // since the lowest denomination of bitcoin on-chain is the satoshi.
2115 (COMMITMENT_TX_BASE_WEIGHT + num_htlcs as u64 * COMMITMENT_TX_WEIGHT_PER_HTLC) * feerate_per_kw as u64 / 1000 * 1000
2118 // Get the fee cost in SATS of a commitment tx with a given number of HTLC outputs.
2119 // Note that num_htlcs should not include dust HTLCs.
2121 fn commit_tx_fee_sat(feerate_per_kw: u32, num_htlcs: usize) -> u64 {
2122 feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT + num_htlcs as u64 * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000
2125 // Get the commitment tx fee for the local's (i.e. our) next commitment transaction based on the
2126 // number of pending HTLCs that are on track to be in our next commitment tx, plus an additional
2127 // HTLC if `fee_spike_buffer_htlc` is Some, plus a new HTLC given by `new_htlc_amount`. Dust HTLCs
2129 fn next_local_commit_tx_fee_msat(&self, htlc: HTLCCandidate, fee_spike_buffer_htlc: Option<()>) -> u64 {
2130 assert!(self.is_outbound());
2132 let real_dust_limit_success_sat = (self.feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
2133 let real_dust_limit_timeout_sat = (self.feerate_per_kw as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
2135 let mut addl_htlcs = 0;
2136 if fee_spike_buffer_htlc.is_some() { addl_htlcs += 1; }
2138 HTLCInitiator::LocalOffered => {
2139 if htlc.amount_msat / 1000 >= real_dust_limit_timeout_sat {
2143 HTLCInitiator::RemoteOffered => {
2144 if htlc.amount_msat / 1000 >= real_dust_limit_success_sat {
2150 let mut included_htlcs = 0;
2151 for ref htlc in self.pending_inbound_htlcs.iter() {
2152 if htlc.amount_msat / 1000 < real_dust_limit_success_sat {
2155 // We include LocalRemoved HTLCs here because we may still need to broadcast a commitment
2156 // transaction including this HTLC if it times out before they RAA.
2157 included_htlcs += 1;
2160 for ref htlc in self.pending_outbound_htlcs.iter() {
2161 if htlc.amount_msat / 1000 < real_dust_limit_timeout_sat {
2165 OutboundHTLCState::LocalAnnounced {..} => included_htlcs += 1,
2166 OutboundHTLCState::Committed => included_htlcs += 1,
2167 OutboundHTLCState::RemoteRemoved {..} => included_htlcs += 1,
2168 // We don't include AwaitingRemoteRevokeToRemove HTLCs because our next commitment
2169 // transaction won't be generated until they send us their next RAA, which will mean
2170 // dropping any HTLCs in this state.
2175 for htlc in self.holding_cell_htlc_updates.iter() {
2177 &HTLCUpdateAwaitingACK::AddHTLC { amount_msat, .. } => {
2178 if amount_msat / 1000 < real_dust_limit_timeout_sat {
2183 _ => {}, // Don't include claims/fails that are awaiting ack, because once we get the
2184 // ack we're guaranteed to never include them in commitment txs anymore.
2188 let num_htlcs = included_htlcs + addl_htlcs;
2189 let res = Self::commit_tx_fee_msat(self.feerate_per_kw, num_htlcs);
2190 #[cfg(any(test, feature = "fuzztarget"))]
2193 if fee_spike_buffer_htlc.is_some() {
2194 fee = Self::commit_tx_fee_msat(self.feerate_per_kw, num_htlcs - 1);
2196 let total_pending_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len()
2197 + self.holding_cell_htlc_updates.len();
2198 let commitment_tx_info = CommitmentTxInfoCached {
2200 total_pending_htlcs,
2201 next_holder_htlc_id: match htlc.origin {
2202 HTLCInitiator::LocalOffered => self.next_holder_htlc_id + 1,
2203 HTLCInitiator::RemoteOffered => self.next_holder_htlc_id,
2205 next_counterparty_htlc_id: match htlc.origin {
2206 HTLCInitiator::LocalOffered => self.next_counterparty_htlc_id,
2207 HTLCInitiator::RemoteOffered => self.next_counterparty_htlc_id + 1,
2209 feerate: self.feerate_per_kw,
2211 *self.next_local_commitment_tx_fee_info_cached.lock().unwrap() = Some(commitment_tx_info);
2216 // Get the commitment tx fee for the remote's next commitment transaction based on the number of
2217 // pending HTLCs that are on track to be in their next commitment tx, plus an additional HTLC if
2218 // `fee_spike_buffer_htlc` is Some, plus a new HTLC given by `new_htlc_amount`. Dust HTLCs are
2220 fn next_remote_commit_tx_fee_msat(&self, htlc: HTLCCandidate, fee_spike_buffer_htlc: Option<()>) -> u64 {
2221 assert!(!self.is_outbound());
2223 let real_dust_limit_success_sat = (self.feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
2224 let real_dust_limit_timeout_sat = (self.feerate_per_kw as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
2226 let mut addl_htlcs = 0;
2227 if fee_spike_buffer_htlc.is_some() { addl_htlcs += 1; }
2229 HTLCInitiator::LocalOffered => {
2230 if htlc.amount_msat / 1000 >= real_dust_limit_success_sat {
2234 HTLCInitiator::RemoteOffered => {
2235 if htlc.amount_msat / 1000 >= real_dust_limit_timeout_sat {
2241 // When calculating the set of HTLCs which will be included in their next commitment_signed, all
2242 // non-dust inbound HTLCs are included (as all states imply it will be included) and only
2243 // committed outbound HTLCs, see below.
2244 let mut included_htlcs = 0;
2245 for ref htlc in self.pending_inbound_htlcs.iter() {
2246 if htlc.amount_msat / 1000 <= real_dust_limit_timeout_sat {
2249 included_htlcs += 1;
2252 for ref htlc in self.pending_outbound_htlcs.iter() {
2253 if htlc.amount_msat / 1000 <= real_dust_limit_success_sat {
2256 // We only include outbound HTLCs if it will not be included in their next commitment_signed,
2257 // i.e. if they've responded to us with an RAA after announcement.
2259 OutboundHTLCState::Committed => included_htlcs += 1,
2260 OutboundHTLCState::RemoteRemoved {..} => included_htlcs += 1,
2261 OutboundHTLCState::LocalAnnounced { .. } => included_htlcs += 1,
2266 let num_htlcs = included_htlcs + addl_htlcs;
2267 let res = Self::commit_tx_fee_msat(self.feerate_per_kw, num_htlcs);
2268 #[cfg(any(test, feature = "fuzztarget"))]
2271 if fee_spike_buffer_htlc.is_some() {
2272 fee = Self::commit_tx_fee_msat(self.feerate_per_kw, num_htlcs - 1);
2274 let total_pending_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len();
2275 let commitment_tx_info = CommitmentTxInfoCached {
2277 total_pending_htlcs,
2278 next_holder_htlc_id: match htlc.origin {
2279 HTLCInitiator::LocalOffered => self.next_holder_htlc_id + 1,
2280 HTLCInitiator::RemoteOffered => self.next_holder_htlc_id,
2282 next_counterparty_htlc_id: match htlc.origin {
2283 HTLCInitiator::LocalOffered => self.next_counterparty_htlc_id,
2284 HTLCInitiator::RemoteOffered => self.next_counterparty_htlc_id + 1,
2286 feerate: self.feerate_per_kw,
2288 *self.next_remote_commitment_tx_fee_info_cached.lock().unwrap() = Some(commitment_tx_info);
2293 pub fn update_add_htlc<F, L: Deref>(&mut self, msg: &msgs::UpdateAddHTLC, mut pending_forward_status: PendingHTLCStatus, create_pending_htlc_status: F, logger: &L) -> Result<(), ChannelError>
2294 where F: for<'a> Fn(&'a Self, PendingHTLCStatus, u16) -> PendingHTLCStatus, L::Target: Logger {
2295 // We can't accept HTLCs sent after we've sent a shutdown.
2296 let local_sent_shutdown = (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::LocalShutdownSent as u32)) != (ChannelState::ChannelFunded as u32);
2297 if local_sent_shutdown {
2298 pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x4000|8);
2300 // If the remote has sent a shutdown prior to adding this HTLC, then they are in violation of the spec.
2301 let remote_sent_shutdown = (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32);
2302 if remote_sent_shutdown {
2303 return Err(ChannelError::Close("Got add HTLC message when channel was not in an operational state".to_owned()));
2305 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2306 return Err(ChannelError::Close("Peer sent update_add_htlc when we needed a channel_reestablish".to_owned()));
2308 if msg.amount_msat > self.channel_value_satoshis * 1000 {
2309 return Err(ChannelError::Close("Remote side tried to send more than the total value of the channel".to_owned()));
2311 if msg.amount_msat == 0 {
2312 return Err(ChannelError::Close("Remote side tried to send a 0-msat HTLC".to_owned()));
2314 if msg.amount_msat < self.holder_htlc_minimum_msat {
2315 return Err(ChannelError::Close(format!("Remote side tried to send less than our minimum HTLC value. Lower limit: ({}). Actual: ({})", self.holder_htlc_minimum_msat, msg.amount_msat)));
2318 let inbound_stats = self.get_inbound_pending_htlc_stats(None);
2319 let outbound_stats = self.get_outbound_pending_htlc_stats(None);
2320 if inbound_stats.pending_htlcs + 1 > OUR_MAX_HTLCS as u32 {
2321 return Err(ChannelError::Close(format!("Remote tried to push more than our max accepted HTLCs ({})", OUR_MAX_HTLCS)));
2323 let holder_max_htlc_value_in_flight_msat = Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis);
2324 if inbound_stats.pending_htlcs_value_msat + msg.amount_msat > holder_max_htlc_value_in_flight_msat {
2325 return Err(ChannelError::Close(format!("Remote HTLC add would put them over our max HTLC value ({})", holder_max_htlc_value_in_flight_msat)));
2327 // Check holder_selected_channel_reserve_satoshis (we're getting paid, so they have to at least meet
2328 // the reserve_satoshis we told them to always have as direct payment so that they lose
2329 // something if we punish them for broadcasting an old state).
2330 // Note that we don't really care about having a small/no to_remote output in our local
2331 // commitment transactions, as the purpose of the channel reserve is to ensure we can
2332 // punish *them* if they misbehave, so we discount any outbound HTLCs which will not be
2333 // present in the next commitment transaction we send them (at least for fulfilled ones,
2334 // failed ones won't modify value_to_self).
2335 // Note that we will send HTLCs which another instance of rust-lightning would think
2336 // violate the reserve value if we do not do this (as we forget inbound HTLCs from the
2337 // Channel state once they will not be present in the next received commitment
2339 let mut removed_outbound_total_msat = 0;
2340 for ref htlc in self.pending_outbound_htlcs.iter() {
2341 if let OutboundHTLCState::AwaitingRemoteRevokeToRemove(None) = htlc.state {
2342 removed_outbound_total_msat += htlc.amount_msat;
2343 } else if let OutboundHTLCState::AwaitingRemovedRemoteRevoke(None) = htlc.state {
2344 removed_outbound_total_msat += htlc.amount_msat;
2348 let exposure_dust_limit_timeout_sats = (self.get_dust_buffer_feerate(None) as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
2349 if msg.amount_msat / 1000 < exposure_dust_limit_timeout_sats {
2350 let on_counterparty_tx_dust_htlc_exposure_msat = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat + msg.amount_msat;
2351 if on_counterparty_tx_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
2352 log_info!(logger, "Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx",
2353 on_counterparty_tx_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat());
2354 pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
2358 let exposure_dust_limit_success_sats = (self.get_dust_buffer_feerate(None) as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
2359 if msg.amount_msat / 1000 < exposure_dust_limit_success_sats {
2360 let on_holder_tx_dust_htlc_exposure_msat = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat + msg.amount_msat;
2361 if on_holder_tx_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
2362 log_info!(logger, "Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx",
2363 on_holder_tx_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat());
2364 pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
2368 let pending_value_to_self_msat =
2369 self.value_to_self_msat + inbound_stats.pending_htlcs_value_msat - removed_outbound_total_msat;
2370 let pending_remote_value_msat =
2371 self.channel_value_satoshis * 1000 - pending_value_to_self_msat;
2372 if pending_remote_value_msat < msg.amount_msat {
2373 return Err(ChannelError::Close("Remote HTLC add would overdraw remaining funds".to_owned()));
2376 // Check that the remote can afford to pay for this HTLC on-chain at the current
2377 // feerate_per_kw, while maintaining their channel reserve (as required by the spec).
2378 let remote_commit_tx_fee_msat = if self.is_outbound() { 0 } else {
2379 let htlc_candidate = HTLCCandidate::new(msg.amount_msat, HTLCInitiator::RemoteOffered);
2380 self.next_remote_commit_tx_fee_msat(htlc_candidate, None) // Don't include the extra fee spike buffer HTLC in calculations
2382 if pending_remote_value_msat - msg.amount_msat < remote_commit_tx_fee_msat {
2383 return Err(ChannelError::Close("Remote HTLC add would not leave enough to pay for fees".to_owned()));
2386 let chan_reserve_msat =
2387 Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) * 1000;
2388 if pending_remote_value_msat - msg.amount_msat - remote_commit_tx_fee_msat < chan_reserve_msat {
2389 return Err(ChannelError::Close("Remote HTLC add would put them under remote reserve value".to_owned()));
2392 if !self.is_outbound() {
2393 // `2 *` and `Some(())` is for the fee spike buffer we keep for the remote. This deviates from
2394 // the spec because in the spec, the fee spike buffer requirement doesn't exist on the
2395 // receiver's side, only on the sender's.
2396 // Note that when we eventually remove support for fee updates and switch to anchor output
2397 // fees, we will drop the `2 *`, since we no longer be as sensitive to fee spikes. But, keep
2398 // the extra htlc when calculating the next remote commitment transaction fee as we should
2399 // still be able to afford adding this HTLC plus one more future HTLC, regardless of being
2400 // sensitive to fee spikes.
2401 let htlc_candidate = HTLCCandidate::new(msg.amount_msat, HTLCInitiator::RemoteOffered);
2402 let remote_fee_cost_incl_stuck_buffer_msat = 2 * self.next_remote_commit_tx_fee_msat(htlc_candidate, Some(()));
2403 if pending_remote_value_msat - msg.amount_msat - chan_reserve_msat < remote_fee_cost_incl_stuck_buffer_msat {
2404 // Note that if the pending_forward_status is not updated here, then it's because we're already failing
2405 // the HTLC, i.e. its status is already set to failing.
2406 log_info!(logger, "Attempting to fail HTLC due to fee spike buffer violation in channel {}. Rebalancing is required.", log_bytes!(self.channel_id()));
2407 pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
2410 // Check that they won't violate our local required channel reserve by adding this HTLC.
2411 let htlc_candidate = HTLCCandidate::new(msg.amount_msat, HTLCInitiator::RemoteOffered);
2412 let local_commit_tx_fee_msat = self.next_local_commit_tx_fee_msat(htlc_candidate, None);
2413 if self.value_to_self_msat < self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000 + local_commit_tx_fee_msat {
2414 return Err(ChannelError::Close("Cannot accept HTLC that would put our balance under counterparty-announced channel reserve value".to_owned()));
2417 if self.next_counterparty_htlc_id != msg.htlc_id {
2418 return Err(ChannelError::Close(format!("Remote skipped HTLC ID (skipped ID: {})", self.next_counterparty_htlc_id)));
2420 if msg.cltv_expiry >= 500000000 {
2421 return Err(ChannelError::Close("Remote provided CLTV expiry in seconds instead of block height".to_owned()));
2424 if self.channel_state & ChannelState::LocalShutdownSent as u32 != 0 {
2425 if let PendingHTLCStatus::Forward(_) = pending_forward_status {
2426 panic!("ChannelManager shouldn't be trying to add a forwardable HTLC after we've started closing");
2430 // Now update local state:
2431 self.next_counterparty_htlc_id += 1;
2432 self.pending_inbound_htlcs.push(InboundHTLCOutput {
2433 htlc_id: msg.htlc_id,
2434 amount_msat: msg.amount_msat,
2435 payment_hash: msg.payment_hash,
2436 cltv_expiry: msg.cltv_expiry,
2437 state: InboundHTLCState::RemoteAnnounced(pending_forward_status),
2442 /// Marks an outbound HTLC which we have received update_fail/fulfill/malformed
2444 fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<PaymentHash>, fail_reason: Option<HTLCFailReason>) -> Result<&OutboundHTLCOutput, ChannelError> {
2445 for htlc in self.pending_outbound_htlcs.iter_mut() {
2446 if htlc.htlc_id == htlc_id {
2447 match check_preimage {
2449 Some(payment_hash) =>
2450 if payment_hash != htlc.payment_hash {
2451 return Err(ChannelError::Close(format!("Remote tried to fulfill HTLC ({}) with an incorrect preimage", htlc_id)));
2455 OutboundHTLCState::LocalAnnounced(_) =>
2456 return Err(ChannelError::Close(format!("Remote tried to fulfill/fail HTLC ({}) before it had been committed", htlc_id))),
2457 OutboundHTLCState::Committed => {
2458 htlc.state = OutboundHTLCState::RemoteRemoved(fail_reason);
2460 OutboundHTLCState::AwaitingRemoteRevokeToRemove(_) | OutboundHTLCState::AwaitingRemovedRemoteRevoke(_) | OutboundHTLCState::RemoteRemoved(_) =>
2461 return Err(ChannelError::Close(format!("Remote tried to fulfill/fail HTLC ({}) that they'd already fulfilled/failed", htlc_id))),
2466 Err(ChannelError::Close("Remote tried to fulfill/fail an HTLC we couldn't find".to_owned()))
2469 pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<(HTLCSource, u64), ChannelError> {
2470 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2471 return Err(ChannelError::Close("Got fulfill HTLC message when channel was not in an operational state".to_owned()));
2473 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2474 return Err(ChannelError::Close("Peer sent update_fulfill_htlc when we needed a channel_reestablish".to_owned()));
2477 let payment_hash = PaymentHash(Sha256::hash(&msg.payment_preimage.0[..]).into_inner());
2478 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None).map(|htlc| (htlc.source.clone(), htlc.amount_msat))
2481 pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
2482 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2483 return Err(ChannelError::Close("Got fail HTLC message when channel was not in an operational state".to_owned()));
2485 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2486 return Err(ChannelError::Close("Peer sent update_fail_htlc when we needed a channel_reestablish".to_owned()));
2489 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
2493 pub fn update_fail_malformed_htlc(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
2494 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2495 return Err(ChannelError::Close("Got fail malformed HTLC message when channel was not in an operational state".to_owned()));
2497 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2498 return Err(ChannelError::Close("Peer sent update_fail_malformed_htlc when we needed a channel_reestablish".to_owned()));
2501 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
2505 pub fn commitment_signed<L: Deref>(&mut self, msg: &msgs::CommitmentSigned, logger: &L) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitorUpdate), (Option<ChannelMonitorUpdate>, ChannelError)>
2506 where L::Target: Logger
2508 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2509 return Err((None, ChannelError::Close("Got commitment signed message when channel was not in an operational state".to_owned())));
2511 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2512 return Err((None, ChannelError::Close("Peer sent commitment_signed when we needed a channel_reestablish".to_owned())));
2514 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
2515 return Err((None, ChannelError::Close("Peer sent commitment_signed after we'd started exchanging closing_signeds".to_owned())));
2518 let funding_script = self.get_funding_redeemscript();
2520 let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number).map_err(|e| (None, e))?;
2522 let commitment_stats = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, logger);
2523 let commitment_txid = {
2524 let trusted_tx = commitment_stats.tx.trust();
2525 let bitcoin_tx = trusted_tx.built_transaction();
2526 let sighash = bitcoin_tx.get_sighash_all(&funding_script, self.channel_value_satoshis);
2528 log_trace!(logger, "Checking commitment tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} in channel {}",
2529 log_bytes!(msg.signature.serialize_compact()[..]),
2530 log_bytes!(self.counterparty_funding_pubkey().serialize()), encode::serialize_hex(&bitcoin_tx.transaction),
2531 log_bytes!(sighash[..]), encode::serialize_hex(&funding_script), log_bytes!(self.channel_id()));
2532 if let Err(_) = self.secp_ctx.verify(&sighash, &msg.signature, &self.counterparty_funding_pubkey()) {
2533 return Err((None, ChannelError::Close("Invalid commitment tx signature from peer".to_owned())));
2537 let mut htlcs_cloned: Vec<_> = commitment_stats.htlcs_included.iter().map(|htlc| (htlc.0.clone(), htlc.1.map(|h| h.clone()))).collect();
2539 // If our counterparty updated the channel fee in this commitment transaction, check that
2540 // they can actually afford the new fee now.
2541 let update_fee = if let Some((_, update_state)) = self.pending_update_fee {
2542 update_state == FeeUpdateState::RemoteAnnounced
2545 debug_assert!(!self.is_outbound());
2546 let counterparty_reserve_we_require_msat = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) * 1000;
2547 if commitment_stats.remote_balance_msat < commitment_stats.total_fee_sat * 1000 + counterparty_reserve_we_require_msat {
2548 return Err((None, ChannelError::Close("Funding remote cannot afford proposed new fee".to_owned())));
2551 #[cfg(any(test, feature = "fuzztarget"))]
2553 if self.is_outbound() {
2554 let projected_commit_tx_info = self.next_local_commitment_tx_fee_info_cached.lock().unwrap().take();
2555 *self.next_remote_commitment_tx_fee_info_cached.lock().unwrap() = None;
2556 if let Some(info) = projected_commit_tx_info {
2557 let total_pending_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len()
2558 + self.holding_cell_htlc_updates.len();
2559 if info.total_pending_htlcs == total_pending_htlcs
2560 && info.next_holder_htlc_id == self.next_holder_htlc_id
2561 && info.next_counterparty_htlc_id == self.next_counterparty_htlc_id
2562 && info.feerate == self.feerate_per_kw {
2563 assert_eq!(commitment_stats.total_fee_sat, info.fee / 1000);
2569 if msg.htlc_signatures.len() != commitment_stats.num_nondust_htlcs {
2570 return Err((None, ChannelError::Close(format!("Got wrong number of HTLC signatures ({}) from remote. It must be {}", msg.htlc_signatures.len(), commitment_stats.num_nondust_htlcs))));
2573 // TODO: Sadly, we pass HTLCs twice to ChannelMonitor: once via the HolderCommitmentTransaction and once via the update
2574 let mut htlcs_and_sigs = Vec::with_capacity(htlcs_cloned.len());
2575 for (idx, (htlc, source)) in htlcs_cloned.drain(..).enumerate() {
2576 if let Some(_) = htlc.transaction_output_index {
2577 let htlc_tx = chan_utils::build_htlc_transaction(&commitment_txid, commitment_stats.feerate_per_kw,
2578 self.get_counterparty_selected_contest_delay().unwrap(), &htlc,
2579 &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
2581 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
2582 let htlc_sighash = hash_to_message!(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, SigHashType::All)[..]);
2583 log_trace!(logger, "Checking HTLC tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} in channel {}.",
2584 log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(keys.countersignatory_htlc_key.serialize()),
2585 encode::serialize_hex(&htlc_tx), log_bytes!(htlc_sighash[..]), encode::serialize_hex(&htlc_redeemscript), log_bytes!(self.channel_id()));
2586 if let Err(_) = self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &keys.countersignatory_htlc_key) {
2587 return Err((None, ChannelError::Close("Invalid HTLC tx signature from peer".to_owned())));
2589 htlcs_and_sigs.push((htlc, Some(msg.htlc_signatures[idx]), source));
2591 htlcs_and_sigs.push((htlc, None, source));
2595 let holder_commitment_tx = HolderCommitmentTransaction::new(
2596 commitment_stats.tx,
2598 msg.htlc_signatures.clone(),
2599 &self.get_holder_pubkeys().funding_pubkey,
2600 self.counterparty_funding_pubkey()
2603 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number - 1, &self.secp_ctx);
2604 self.holder_signer.validate_holder_commitment(&holder_commitment_tx)
2605 .map_err(|_| (None, ChannelError::Close("Failed to validate our commitment".to_owned())))?;
2606 let per_commitment_secret = self.holder_signer.release_commitment_secret(self.cur_holder_commitment_transaction_number + 1);
2608 // Update state now that we've passed all the can-fail calls...
2609 let mut need_commitment = false;
2610 if let &mut Some((_, ref mut update_state)) = &mut self.pending_update_fee {
2611 if *update_state == FeeUpdateState::RemoteAnnounced {
2612 *update_state = FeeUpdateState::AwaitingRemoteRevokeToAnnounce;
2613 need_commitment = true;
2617 self.latest_monitor_update_id += 1;
2618 let mut monitor_update = ChannelMonitorUpdate {
2619 update_id: self.latest_monitor_update_id,
2620 updates: vec![ChannelMonitorUpdateStep::LatestHolderCommitmentTXInfo {
2621 commitment_tx: holder_commitment_tx,
2622 htlc_outputs: htlcs_and_sigs
2626 for htlc in self.pending_inbound_htlcs.iter_mut() {
2627 let new_forward = if let &InboundHTLCState::RemoteAnnounced(ref forward_info) = &htlc.state {
2628 Some(forward_info.clone())
2630 if let Some(forward_info) = new_forward {
2631 log_trace!(logger, "Updating HTLC {} to AwaitingRemoteRevokeToAnnounce due to commitment_signed in channel {}.",
2632 log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
2633 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info);
2634 need_commitment = true;
2637 for htlc in self.pending_outbound_htlcs.iter_mut() {
2638 if let Some(fail_reason) = if let &mut OutboundHTLCState::RemoteRemoved(ref mut fail_reason) = &mut htlc.state {
2639 Some(fail_reason.take())
2641 log_trace!(logger, "Updating HTLC {} to AwaitingRemoteRevokeToRemove due to commitment_signed in channel {}.",
2642 log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
2643 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove(fail_reason);
2644 need_commitment = true;
2648 self.cur_holder_commitment_transaction_number -= 1;
2649 // Note that if we need_commitment & !AwaitingRemoteRevoke we'll call
2650 // send_commitment_no_status_check() next which will reset this to RAAFirst.
2651 self.resend_order = RAACommitmentOrder::CommitmentFirst;
2653 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0 {
2654 // In case we initially failed monitor updating without requiring a response, we need
2655 // to make sure the RAA gets sent first.
2656 self.monitor_pending_revoke_and_ack = true;
2657 if need_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
2658 // If we were going to send a commitment_signed after the RAA, go ahead and do all
2659 // the corresponding HTLC status updates so that get_last_commitment_update
2660 // includes the right HTLCs.
2661 self.monitor_pending_commitment_signed = true;
2662 let (_, mut additional_update) = self.send_commitment_no_status_check(logger).map_err(|e| (None, e))?;
2663 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
2664 // strictly increasing by one, so decrement it here.
2665 self.latest_monitor_update_id = monitor_update.update_id;
2666 monitor_update.updates.append(&mut additional_update.updates);
2668 log_debug!(logger, "Received valid commitment_signed from peer in channel {}, updated HTLC state but awaiting a monitor update resolution to reply.",
2669 log_bytes!(self.channel_id));
2670 return Err((Some(monitor_update), ChannelError::Ignore("Previous monitor update failure prevented generation of RAA".to_owned())));
2673 let commitment_signed = if need_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
2674 // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
2675 // we'll send one right away when we get the revoke_and_ack when we
2676 // free_holding_cell_htlcs().
2677 let (msg, mut additional_update) = self.send_commitment_no_status_check(logger).map_err(|e| (None, e))?;
2678 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
2679 // strictly increasing by one, so decrement it here.
2680 self.latest_monitor_update_id = monitor_update.update_id;
2681 monitor_update.updates.append(&mut additional_update.updates);
2685 log_debug!(logger, "Received valid commitment_signed from peer in channel {}, updating HTLC state and responding with{} a revoke_and_ack.",
2686 log_bytes!(self.channel_id()), if commitment_signed.is_some() { " our own commitment_signed and" } else { "" });
2688 Ok((msgs::RevokeAndACK {
2689 channel_id: self.channel_id,
2690 per_commitment_secret,
2691 next_per_commitment_point,
2692 }, commitment_signed, monitor_update))
2695 /// Public version of the below, checking relevant preconditions first.
2696 /// If we're not in a state where freeing the holding cell makes sense, this is a no-op and
2697 /// returns `(None, Vec::new())`.
2698 pub fn maybe_free_holding_cell_htlcs<L: Deref>(&mut self, logger: &L) -> Result<(Option<(msgs::CommitmentUpdate, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>), ChannelError> where L::Target: Logger {
2699 if self.channel_state >= ChannelState::ChannelFunded as u32 &&
2700 (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) == 0 {
2701 self.free_holding_cell_htlcs(logger)
2702 } else { Ok((None, Vec::new())) }
2705 /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
2706 /// fulfilling or failing the last pending HTLC)
2707 fn free_holding_cell_htlcs<L: Deref>(&mut self, logger: &L) -> Result<(Option<(msgs::CommitmentUpdate, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>), ChannelError> where L::Target: Logger {
2708 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
2709 if self.holding_cell_htlc_updates.len() != 0 || self.holding_cell_update_fee.is_some() {
2710 log_trace!(logger, "Freeing holding cell with {} HTLC updates{} in channel {}", self.holding_cell_htlc_updates.len(),
2711 if self.holding_cell_update_fee.is_some() { " and a fee update" } else { "" }, log_bytes!(self.channel_id()));
2713 let mut monitor_update = ChannelMonitorUpdate {
2714 update_id: self.latest_monitor_update_id + 1, // We don't increment this yet!
2715 updates: Vec::new(),
2718 let mut htlc_updates = Vec::new();
2719 mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
2720 let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
2721 let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
2722 let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
2723 let mut htlcs_to_fail = Vec::new();
2724 for htlc_update in htlc_updates.drain(..) {
2725 // Note that this *can* fail, though it should be due to rather-rare conditions on
2726 // fee races with adding too many outputs which push our total payments just over
2727 // the limit. In case it's less rare than I anticipate, we may want to revisit
2728 // handling this case better and maybe fulfilling some of the HTLCs while attempting
2729 // to rebalance channels.
2730 match &htlc_update {
2731 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet, ..} => {
2732 match self.send_htlc(amount_msat, *payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone(), logger) {
2733 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
2736 ChannelError::Ignore(ref msg) => {
2737 log_info!(logger, "Failed to send HTLC with payment_hash {} due to {} in channel {}",
2738 log_bytes!(payment_hash.0), msg, log_bytes!(self.channel_id()));
2739 // If we fail to send here, then this HTLC should
2740 // be failed backwards. Failing to send here
2741 // indicates that this HTLC may keep being put back
2742 // into the holding cell without ever being
2743 // successfully forwarded/failed/fulfilled, causing
2744 // our counterparty to eventually close on us.
2745 htlcs_to_fail.push((source.clone(), *payment_hash));
2748 panic!("Got a non-IgnoreError action trying to send holding cell HTLC");
2754 &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, htlc_id, .. } => {
2755 // If an HTLC claim was previously added to the holding cell (via
2756 // `get_update_fulfill_htlc`, then generating the claim message itself must
2757 // not fail - any in between attempts to claim the HTLC will have resulted
2758 // in it hitting the holding cell again and we cannot change the state of a
2759 // holding cell HTLC from fulfill to anything else.
2760 let (update_fulfill_msg_option, mut additional_monitor_update) =
2761 if let UpdateFulfillFetch::NewClaim { msg, monitor_update, .. } = self.get_update_fulfill_htlc(htlc_id, *payment_preimage, logger) {
2762 (msg, monitor_update)
2763 } else { unreachable!() };
2764 update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap());
2765 monitor_update.updates.append(&mut additional_monitor_update.updates);
2767 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
2768 match self.get_update_fail_htlc(htlc_id, err_packet.clone(), logger) {
2769 Ok(update_fail_msg_option) => {
2770 // If an HTLC failure was previously added to the holding cell (via
2771 // `get_update_fail_htlc`) then generating the fail message itself
2772 // must not fail - we should never end up in a state where we
2773 // double-fail an HTLC or fail-then-claim an HTLC as it indicates
2774 // we didn't wait for a full revocation before failing.
2775 update_fail_htlcs.push(update_fail_msg_option.unwrap())
2778 if let ChannelError::Ignore(_) = e {}
2780 panic!("Got a non-IgnoreError action trying to fail holding cell HTLC");
2787 if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() && self.holding_cell_update_fee.is_none() {
2788 return Ok((None, htlcs_to_fail));
2790 let update_fee = if let Some(feerate) = self.holding_cell_update_fee.take() {
2791 self.send_update_fee(feerate, logger)
2796 let (commitment_signed, mut additional_update) = self.send_commitment_no_status_check(logger)?;
2797 // send_commitment_no_status_check and get_update_fulfill_htlc may bump latest_monitor_id
2798 // but we want them to be strictly increasing by one, so reset it here.
2799 self.latest_monitor_update_id = monitor_update.update_id;
2800 monitor_update.updates.append(&mut additional_update.updates);
2802 log_debug!(logger, "Freeing holding cell in channel {} resulted in {}{} HTLCs added, {} HTLCs fulfilled, and {} HTLCs failed.",
2803 log_bytes!(self.channel_id()), if update_fee.is_some() { "a fee update, " } else { "" },
2804 update_add_htlcs.len(), update_fulfill_htlcs.len(), update_fail_htlcs.len());
2806 Ok((Some((msgs::CommitmentUpdate {
2808 update_fulfill_htlcs,
2810 update_fail_malformed_htlcs: Vec::new(),
2813 }, monitor_update)), htlcs_to_fail))
2815 Ok((None, Vec::new()))
2819 /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
2820 /// commitment_signed message here in case we had pending outbound HTLCs to add which were
2821 /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
2822 /// generating an appropriate error *after* the channel state has been updated based on the
2823 /// revoke_and_ack message.
2824 pub fn revoke_and_ack<L: Deref>(&mut self, msg: &msgs::RevokeAndACK, logger: &L) -> Result<RAAUpdates, ChannelError>
2825 where L::Target: Logger,
2827 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2828 return Err(ChannelError::Close("Got revoke/ACK message when channel was not in an operational state".to_owned()));
2830 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2831 return Err(ChannelError::Close("Peer sent revoke_and_ack when we needed a channel_reestablish".to_owned()));
2833 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
2834 return Err(ChannelError::Close("Peer sent revoke_and_ack after we'd started exchanging closing_signeds".to_owned()));
2837 let secret = secp_check!(SecretKey::from_slice(&msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret".to_owned());
2839 if let Some(counterparty_prev_commitment_point) = self.counterparty_prev_commitment_point {
2840 if PublicKey::from_secret_key(&self.secp_ctx, &secret) != counterparty_prev_commitment_point {
2841 return Err(ChannelError::Close("Got a revoke commitment secret which didn't correspond to their current pubkey".to_owned()));
2845 if self.channel_state & ChannelState::AwaitingRemoteRevoke as u32 == 0 {
2846 // Our counterparty seems to have burned their coins to us (by revoking a state when we
2847 // haven't given them a new commitment transaction to broadcast). We should probably
2848 // take advantage of this by updating our channel monitor, sending them an error, and
2849 // waiting for them to broadcast their latest (now-revoked claim). But, that would be a
2850 // lot of work, and there's some chance this is all a misunderstanding anyway.
2851 // We have to do *something*, though, since our signer may get mad at us for otherwise
2852 // jumping a remote commitment number, so best to just force-close and move on.
2853 return Err(ChannelError::Close("Received an unexpected revoke_and_ack".to_owned()));
2856 #[cfg(any(test, feature = "fuzztarget"))]
2858 *self.next_local_commitment_tx_fee_info_cached.lock().unwrap() = None;
2859 *self.next_remote_commitment_tx_fee_info_cached.lock().unwrap() = None;
2862 self.holder_signer.validate_counterparty_revocation(
2863 self.cur_counterparty_commitment_transaction_number + 1,
2865 ).map_err(|_| ChannelError::Close("Failed to validate revocation from peer".to_owned()))?;
2867 self.commitment_secrets.provide_secret(self.cur_counterparty_commitment_transaction_number + 1, msg.per_commitment_secret)
2868 .map_err(|_| ChannelError::Close("Previous secrets did not match new one".to_owned()))?;
2869 self.latest_monitor_update_id += 1;
2870 let mut monitor_update = ChannelMonitorUpdate {
2871 update_id: self.latest_monitor_update_id,
2872 updates: vec![ChannelMonitorUpdateStep::CommitmentSecret {
2873 idx: self.cur_counterparty_commitment_transaction_number + 1,
2874 secret: msg.per_commitment_secret,
2878 // Update state now that we've passed all the can-fail calls...
2879 // (note that we may still fail to generate the new commitment_signed message, but that's
2880 // OK, we step the channel here and *then* if the new generation fails we can fail the
2881 // channel based on that, but stepping stuff here should be safe either way.
2882 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
2883 self.counterparty_prev_commitment_point = self.counterparty_cur_commitment_point;
2884 self.counterparty_cur_commitment_point = Some(msg.next_per_commitment_point);
2885 self.cur_counterparty_commitment_transaction_number -= 1;
2887 log_trace!(logger, "Updating HTLCs on receipt of RAA in channel {}...", log_bytes!(self.channel_id()));
2888 let mut to_forward_infos = Vec::new();
2889 let mut revoked_htlcs = Vec::new();
2890 let mut finalized_claimed_htlcs = Vec::new();
2891 let mut update_fail_htlcs = Vec::new();
2892 let mut update_fail_malformed_htlcs = Vec::new();
2893 let mut require_commitment = false;
2894 let mut value_to_self_msat_diff: i64 = 0;
2897 // Take references explicitly so that we can hold multiple references to self.
2898 let pending_inbound_htlcs: &mut Vec<_> = &mut self.pending_inbound_htlcs;
2899 let pending_outbound_htlcs: &mut Vec<_> = &mut self.pending_outbound_htlcs;
2901 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
2902 pending_inbound_htlcs.retain(|htlc| {
2903 if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
2904 log_trace!(logger, " ...removing inbound LocalRemoved {}", log_bytes!(htlc.payment_hash.0));
2905 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
2906 value_to_self_msat_diff += htlc.amount_msat as i64;
2911 pending_outbound_htlcs.retain(|htlc| {
2912 if let &OutboundHTLCState::AwaitingRemovedRemoteRevoke(ref fail_reason) = &htlc.state {
2913 log_trace!(logger, " ...removing outbound AwaitingRemovedRemoteRevoke {}", log_bytes!(htlc.payment_hash.0));
2914 if let Some(reason) = fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
2915 revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
2917 finalized_claimed_htlcs.push(htlc.source.clone());
2918 // They fulfilled, so we sent them money
2919 value_to_self_msat_diff -= htlc.amount_msat as i64;
2924 for htlc in pending_inbound_htlcs.iter_mut() {
2925 let swap = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) = &htlc.state {
2927 } else if let &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) = &htlc.state {
2931 let mut state = InboundHTLCState::Committed;
2932 mem::swap(&mut state, &mut htlc.state);
2934 if let InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info) = state {
2935 log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to AwaitingAnnouncedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
2936 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info);
2937 require_commitment = true;
2938 } else if let InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info) = state {
2939 match forward_info {
2940 PendingHTLCStatus::Fail(fail_msg) => {
2941 log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to LocalRemoved due to PendingHTLCStatus indicating failure", log_bytes!(htlc.payment_hash.0));
2942 require_commitment = true;
2944 HTLCFailureMsg::Relay(msg) => {
2945 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(msg.reason.clone()));
2946 update_fail_htlcs.push(msg)
2948 HTLCFailureMsg::Malformed(msg) => {
2949 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailMalformed((msg.sha256_of_onion, msg.failure_code)));
2950 update_fail_malformed_htlcs.push(msg)
2954 PendingHTLCStatus::Forward(forward_info) => {
2955 log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to Committed", log_bytes!(htlc.payment_hash.0));
2956 to_forward_infos.push((forward_info, htlc.htlc_id));
2957 htlc.state = InboundHTLCState::Committed;
2963 for htlc in pending_outbound_htlcs.iter_mut() {
2964 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
2965 log_trace!(logger, " ...promoting outbound LocalAnnounced {} to Committed", log_bytes!(htlc.payment_hash.0));
2966 htlc.state = OutboundHTLCState::Committed;
2968 if let Some(fail_reason) = if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut fail_reason) = &mut htlc.state {
2969 Some(fail_reason.take())
2971 log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
2972 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(fail_reason);
2973 require_commitment = true;
2977 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
2979 if let Some((feerate, update_state)) = self.pending_update_fee {
2980 match update_state {
2981 FeeUpdateState::Outbound => {
2982 debug_assert!(self.is_outbound());
2983 log_trace!(logger, " ...promoting outbound fee update {} to Committed", feerate);
2984 self.feerate_per_kw = feerate;
2985 self.pending_update_fee = None;
2987 FeeUpdateState::RemoteAnnounced => { debug_assert!(!self.is_outbound()); },
2988 FeeUpdateState::AwaitingRemoteRevokeToAnnounce => {
2989 debug_assert!(!self.is_outbound());
2990 log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce fee update {} to Committed", feerate);
2991 require_commitment = true;
2992 self.feerate_per_kw = feerate;
2993 self.pending_update_fee = None;
2998 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) == ChannelState::MonitorUpdateFailed as u32 {
2999 // We can't actually generate a new commitment transaction (incl by freeing holding
3000 // cells) while we can't update the monitor, so we just return what we have.
3001 if require_commitment {
3002 self.monitor_pending_commitment_signed = true;
3003 // When the monitor updating is restored we'll call get_last_commitment_update(),
3004 // which does not update state, but we're definitely now awaiting a remote revoke
3005 // before we can step forward any more, so set it here.
3006 let (_, mut additional_update) = self.send_commitment_no_status_check(logger)?;
3007 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
3008 // strictly increasing by one, so decrement it here.
3009 self.latest_monitor_update_id = monitor_update.update_id;
3010 monitor_update.updates.append(&mut additional_update.updates);
3012 self.monitor_pending_forwards.append(&mut to_forward_infos);
3013 self.monitor_pending_failures.append(&mut revoked_htlcs);
3014 self.monitor_pending_finalized_fulfills.append(&mut finalized_claimed_htlcs);
3015 log_debug!(logger, "Received a valid revoke_and_ack for channel {} but awaiting a monitor update resolution to reply.", log_bytes!(self.channel_id()));
3016 return Ok(RAAUpdates {
3017 commitment_update: None, finalized_claimed_htlcs: Vec::new(),
3018 accepted_htlcs: Vec::new(), failed_htlcs: Vec::new(),
3020 holding_cell_failed_htlcs: Vec::new()
3024 match self.free_holding_cell_htlcs(logger)? {
3025 (Some((mut commitment_update, mut additional_update)), htlcs_to_fail) => {
3026 commitment_update.update_fail_htlcs.reserve(update_fail_htlcs.len());
3027 for fail_msg in update_fail_htlcs.drain(..) {
3028 commitment_update.update_fail_htlcs.push(fail_msg);
3030 commitment_update.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
3031 for fail_msg in update_fail_malformed_htlcs.drain(..) {
3032 commitment_update.update_fail_malformed_htlcs.push(fail_msg);
3035 // free_holding_cell_htlcs may bump latest_monitor_id multiple times but we want them to be
3036 // strictly increasing by one, so decrement it here.
3037 self.latest_monitor_update_id = monitor_update.update_id;
3038 monitor_update.updates.append(&mut additional_update.updates);
3041 commitment_update: Some(commitment_update),
3042 finalized_claimed_htlcs,
3043 accepted_htlcs: to_forward_infos,
3044 failed_htlcs: revoked_htlcs,
3046 holding_cell_failed_htlcs: htlcs_to_fail
3049 (None, htlcs_to_fail) => {
3050 if require_commitment {
3051 let (commitment_signed, mut additional_update) = self.send_commitment_no_status_check(logger)?;
3053 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
3054 // strictly increasing by one, so decrement it here.
3055 self.latest_monitor_update_id = monitor_update.update_id;
3056 monitor_update.updates.append(&mut additional_update.updates);
3058 log_debug!(logger, "Received a valid revoke_and_ack for channel {}. Responding with a commitment update with {} HTLCs failed.",
3059 log_bytes!(self.channel_id()), update_fail_htlcs.len() + update_fail_malformed_htlcs.len());
3061 commitment_update: Some(msgs::CommitmentUpdate {
3062 update_add_htlcs: Vec::new(),
3063 update_fulfill_htlcs: Vec::new(),
3065 update_fail_malformed_htlcs,
3069 finalized_claimed_htlcs,
3070 accepted_htlcs: to_forward_infos, failed_htlcs: revoked_htlcs,
3071 monitor_update, holding_cell_failed_htlcs: htlcs_to_fail
3074 log_debug!(logger, "Received a valid revoke_and_ack for channel {} with no reply necessary.", log_bytes!(self.channel_id()));
3076 commitment_update: None,
3077 finalized_claimed_htlcs,
3078 accepted_htlcs: to_forward_infos, failed_htlcs: revoked_htlcs,
3079 monitor_update, holding_cell_failed_htlcs: htlcs_to_fail
3086 /// Adds a pending update to this channel. See the doc for send_htlc for
3087 /// further details on the optionness of the return value.
3088 /// If our balance is too low to cover the cost of the next commitment transaction at the
3089 /// new feerate, the update is cancelled.
3090 /// You MUST call send_commitment prior to any other calls on this Channel
3091 fn send_update_fee<L: Deref>(&mut self, feerate_per_kw: u32, logger: &L) -> Option<msgs::UpdateFee> where L::Target: Logger {
3092 if !self.is_outbound() {
3093 panic!("Cannot send fee from inbound channel");
3095 if !self.is_usable() {
3096 panic!("Cannot update fee until channel is fully established and we haven't started shutting down");
3098 if !self.is_live() {
3099 panic!("Cannot update fee while peer is disconnected/we're awaiting a monitor update (ChannelManager should have caught this)");
3102 // Before proposing a feerate update, check that we can actually afford the new fee.
3103 let inbound_stats = self.get_inbound_pending_htlc_stats(Some(feerate_per_kw));
3104 let outbound_stats = self.get_outbound_pending_htlc_stats(Some(feerate_per_kw));
3105 let keys = if let Ok(keys) = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number) { keys } else { return None; };
3106 let commitment_stats = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, true, logger);
3107 let buffer_fee_msat = Channel::<Signer>::commit_tx_fee_sat(feerate_per_kw, commitment_stats.num_nondust_htlcs + outbound_stats.on_holder_tx_holding_cell_htlcs_count as usize + CONCURRENT_INBOUND_HTLC_FEE_BUFFER as usize) * 1000;
3108 let holder_balance_msat = commitment_stats.local_balance_msat - outbound_stats.holding_cell_msat;
3109 if holder_balance_msat < buffer_fee_msat + self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000 {
3110 //TODO: auto-close after a number of failures?
3111 log_debug!(logger, "Cannot afford to send new feerate at {}", feerate_per_kw);
3115 // Note, we evaluate pending htlc "preemptive" trimmed-to-dust threshold at the proposed `feerate_per_kw`.
3116 let holder_tx_dust_exposure = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat;
3117 let counterparty_tx_dust_exposure = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat;
3118 if holder_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
3119 log_debug!(logger, "Cannot afford to send new feerate at {} without infringing max dust htlc exposure", feerate_per_kw);
3122 if counterparty_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
3123 log_debug!(logger, "Cannot afford to send new feerate at {} without infringing max dust htlc exposure", feerate_per_kw);
3127 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
3128 self.holding_cell_update_fee = Some(feerate_per_kw);
3132 debug_assert!(self.pending_update_fee.is_none());
3133 self.pending_update_fee = Some((feerate_per_kw, FeeUpdateState::Outbound));
3135 Some(msgs::UpdateFee {
3136 channel_id: self.channel_id,
3141 pub fn send_update_fee_and_commit<L: Deref>(&mut self, feerate_per_kw: u32, logger: &L) -> Result<Option<(msgs::UpdateFee, msgs::CommitmentSigned, ChannelMonitorUpdate)>, ChannelError> where L::Target: Logger {
3142 match self.send_update_fee(feerate_per_kw, logger) {
3143 Some(update_fee) => {
3144 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check(logger)?;
3145 Ok(Some((update_fee, commitment_signed, monitor_update)))
3151 /// Removes any uncommitted inbound HTLCs and resets the state of uncommitted outbound HTLC
3152 /// updates, to be used on peer disconnection. After this, update_*_htlc messages need to be
3154 /// No further message handling calls may be made until a channel_reestablish dance has
3156 pub fn remove_uncommitted_htlcs_and_mark_paused<L: Deref>(&mut self, logger: &L) where L::Target: Logger {
3157 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
3158 if self.channel_state < ChannelState::FundingSent as u32 {
3159 self.channel_state = ChannelState::ShutdownComplete as u32;
3162 // Upon reconnect we have to start the closing_signed dance over, but shutdown messages
3163 // will be retransmitted.
3164 self.last_sent_closing_fee = None;
3165 self.pending_counterparty_closing_signed = None;
3166 self.closing_fee_limits = None;
3168 let mut inbound_drop_count = 0;
3169 self.pending_inbound_htlcs.retain(|htlc| {
3171 InboundHTLCState::RemoteAnnounced(_) => {
3172 // They sent us an update_add_htlc but we never got the commitment_signed.
3173 // We'll tell them what commitment_signed we're expecting next and they'll drop
3174 // this HTLC accordingly
3175 inbound_drop_count += 1;
3178 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_)|InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => {
3179 // We received a commitment_signed updating this HTLC and (at least hopefully)
3180 // sent a revoke_and_ack (which we can re-transmit) and have heard nothing
3181 // in response to it yet, so don't touch it.
3184 InboundHTLCState::Committed => true,
3185 InboundHTLCState::LocalRemoved(_) => {
3186 // We (hopefully) sent a commitment_signed updating this HTLC (which we can
3187 // re-transmit if needed) and they may have even sent a revoke_and_ack back
3188 // (that we missed). Keep this around for now and if they tell us they missed
3189 // the commitment_signed we can re-transmit the update then.
3194 self.next_counterparty_htlc_id -= inbound_drop_count;
3196 if let Some((_, update_state)) = self.pending_update_fee {
3197 if update_state == FeeUpdateState::RemoteAnnounced {
3198 debug_assert!(!self.is_outbound());
3199 self.pending_update_fee = None;
3203 for htlc in self.pending_outbound_htlcs.iter_mut() {
3204 if let OutboundHTLCState::RemoteRemoved(_) = htlc.state {
3205 // They sent us an update to remove this but haven't yet sent the corresponding
3206 // commitment_signed, we need to move it back to Committed and they can re-send
3207 // the update upon reconnection.
3208 htlc.state = OutboundHTLCState::Committed;
3212 self.channel_state |= ChannelState::PeerDisconnected as u32;
3213 log_trace!(logger, "Peer disconnection resulted in {} remote-announced HTLC drops on channel {}", inbound_drop_count, log_bytes!(self.channel_id()));
3216 /// Indicates that a ChannelMonitor update failed to be stored by the client and further
3217 /// updates are partially paused.
3218 /// This must be called immediately after the call which generated the ChannelMonitor update
3219 /// which failed. The messages which were generated from that call which generated the
3220 /// monitor update failure must *not* have been sent to the remote end, and must instead
3221 /// have been dropped. They will be regenerated when monitor_updating_restored is called.
3222 pub fn monitor_update_failed(&mut self, resend_raa: bool, resend_commitment: bool,
3223 mut pending_forwards: Vec<(PendingHTLCInfo, u64)>,
3224 mut pending_fails: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>,
3225 mut pending_finalized_claimed_htlcs: Vec<HTLCSource>
3227 self.monitor_pending_revoke_and_ack |= resend_raa;
3228 self.monitor_pending_commitment_signed |= resend_commitment;
3229 self.monitor_pending_forwards.append(&mut pending_forwards);
3230 self.monitor_pending_failures.append(&mut pending_fails);
3231 self.monitor_pending_finalized_fulfills.append(&mut pending_finalized_claimed_htlcs);
3232 self.channel_state |= ChannelState::MonitorUpdateFailed as u32;
3235 /// Indicates that the latest ChannelMonitor update has been committed by the client
3236 /// successfully and we should restore normal operation. Returns messages which should be sent
3237 /// to the remote side.
3238 pub fn monitor_updating_restored<L: Deref>(&mut self, logger: &L) -> MonitorRestoreUpdates where L::Target: Logger {
3239 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, ChannelState::MonitorUpdateFailed as u32);
3240 self.channel_state &= !(ChannelState::MonitorUpdateFailed as u32);
3242 let funding_broadcastable = if self.channel_state & (ChannelState::FundingSent as u32) != 0 && self.is_outbound() {
3243 self.funding_transaction.take()
3246 // We will never broadcast the funding transaction when we're in MonitorUpdateFailed (and
3247 // we assume the user never directly broadcasts the funding transaction and waits for us to
3248 // do it). Thus, we can only ever hit monitor_pending_funding_locked when we're an inbound
3249 // channel which failed to persist the monitor on funding_created, and we got the funding
3250 // transaction confirmed before the monitor was persisted.
3251 let funding_locked = if self.monitor_pending_funding_locked {
3252 assert!(!self.is_outbound(), "Funding transaction broadcast by the local client before it should have - LDK didn't do it!");
3253 self.monitor_pending_funding_locked = false;
3254 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
3255 Some(msgs::FundingLocked {
3256 channel_id: self.channel_id(),
3257 next_per_commitment_point,
3261 let mut accepted_htlcs = Vec::new();
3262 mem::swap(&mut accepted_htlcs, &mut self.monitor_pending_forwards);
3263 let mut failed_htlcs = Vec::new();
3264 mem::swap(&mut failed_htlcs, &mut self.monitor_pending_failures);
3265 let mut finalized_claimed_htlcs = Vec::new();
3266 mem::swap(&mut finalized_claimed_htlcs, &mut self.monitor_pending_finalized_fulfills);
3268 if self.channel_state & (ChannelState::PeerDisconnected as u32) != 0 {
3269 self.monitor_pending_revoke_and_ack = false;
3270 self.monitor_pending_commitment_signed = false;
3271 return MonitorRestoreUpdates {
3272 raa: None, commitment_update: None, order: RAACommitmentOrder::RevokeAndACKFirst,
3273 accepted_htlcs, failed_htlcs, finalized_claimed_htlcs, funding_broadcastable, funding_locked
3277 let raa = if self.monitor_pending_revoke_and_ack {
3278 Some(self.get_last_revoke_and_ack())
3280 let commitment_update = if self.monitor_pending_commitment_signed {
3281 Some(self.get_last_commitment_update(logger))
3284 self.monitor_pending_revoke_and_ack = false;
3285 self.monitor_pending_commitment_signed = false;
3286 let order = self.resend_order.clone();
3287 log_debug!(logger, "Restored monitor updating in channel {} resulting in {}{} commitment update and {} RAA, with {} first",
3288 log_bytes!(self.channel_id()), if funding_broadcastable.is_some() { "a funding broadcastable, " } else { "" },
3289 if commitment_update.is_some() { "a" } else { "no" }, if raa.is_some() { "an" } else { "no" },
3290 match order { RAACommitmentOrder::CommitmentFirst => "commitment", RAACommitmentOrder::RevokeAndACKFirst => "RAA"});
3291 MonitorRestoreUpdates {
3292 raa, commitment_update, order, accepted_htlcs, failed_htlcs, finalized_claimed_htlcs, funding_broadcastable, funding_locked
3296 pub fn update_fee<F: Deref>(&mut self, fee_estimator: &F, msg: &msgs::UpdateFee) -> Result<(), ChannelError>
3297 where F::Target: FeeEstimator
3299 if self.is_outbound() {
3300 return Err(ChannelError::Close("Non-funding remote tried to update channel fee".to_owned()));
3302 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
3303 return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish".to_owned()));
3305 Channel::<Signer>::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
3306 let feerate_over_dust_buffer = msg.feerate_per_kw > self.get_dust_buffer_feerate(None);
3308 self.pending_update_fee = Some((msg.feerate_per_kw, FeeUpdateState::RemoteAnnounced));
3309 self.update_time_counter += 1;
3310 // If the feerate has increased over the previous dust buffer (note that
3311 // `get_dust_buffer_feerate` considers the `pending_update_fee` status), check that we
3312 // won't be pushed over our dust exposure limit by the feerate increase.
3313 if feerate_over_dust_buffer {
3314 let inbound_stats = self.get_inbound_pending_htlc_stats(None);
3315 let outbound_stats = self.get_outbound_pending_htlc_stats(None);
3316 let holder_tx_dust_exposure = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat;
3317 let counterparty_tx_dust_exposure = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat;
3318 if holder_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
3319 return Err(ChannelError::Close(format!("Peer sent update_fee with a feerate ({}) which may over-expose us to dust-in-flight on our own transactions (totaling {} msat)",
3320 msg.feerate_per_kw, holder_tx_dust_exposure)));
3322 if counterparty_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
3323 return Err(ChannelError::Close(format!("Peer sent update_fee with a feerate ({}) which may over-expose us to dust-in-flight on our counterparty's transactions (totaling {} msat)",
3324 msg.feerate_per_kw, counterparty_tx_dust_exposure)));
3330 fn get_last_revoke_and_ack(&self) -> msgs::RevokeAndACK {
3331 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
3332 let per_commitment_secret = self.holder_signer.release_commitment_secret(self.cur_holder_commitment_transaction_number + 2);
3333 msgs::RevokeAndACK {
3334 channel_id: self.channel_id,
3335 per_commitment_secret,
3336 next_per_commitment_point,
3340 fn get_last_commitment_update<L: Deref>(&self, logger: &L) -> msgs::CommitmentUpdate where L::Target: Logger {
3341 let mut update_add_htlcs = Vec::new();
3342 let mut update_fulfill_htlcs = Vec::new();
3343 let mut update_fail_htlcs = Vec::new();
3344 let mut update_fail_malformed_htlcs = Vec::new();
3346 for htlc in self.pending_outbound_htlcs.iter() {
3347 if let &OutboundHTLCState::LocalAnnounced(ref onion_packet) = &htlc.state {
3348 update_add_htlcs.push(msgs::UpdateAddHTLC {
3349 channel_id: self.channel_id(),
3350 htlc_id: htlc.htlc_id,
3351 amount_msat: htlc.amount_msat,
3352 payment_hash: htlc.payment_hash,
3353 cltv_expiry: htlc.cltv_expiry,
3354 onion_routing_packet: (**onion_packet).clone(),
3359 for htlc in self.pending_inbound_htlcs.iter() {
3360 if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
3362 &InboundHTLCRemovalReason::FailRelay(ref err_packet) => {
3363 update_fail_htlcs.push(msgs::UpdateFailHTLC {
3364 channel_id: self.channel_id(),
3365 htlc_id: htlc.htlc_id,
3366 reason: err_packet.clone()
3369 &InboundHTLCRemovalReason::FailMalformed((ref sha256_of_onion, ref failure_code)) => {
3370 update_fail_malformed_htlcs.push(msgs::UpdateFailMalformedHTLC {
3371 channel_id: self.channel_id(),
3372 htlc_id: htlc.htlc_id,
3373 sha256_of_onion: sha256_of_onion.clone(),
3374 failure_code: failure_code.clone(),
3377 &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
3378 update_fulfill_htlcs.push(msgs::UpdateFulfillHTLC {
3379 channel_id: self.channel_id(),
3380 htlc_id: htlc.htlc_id,
3381 payment_preimage: payment_preimage.clone(),
3388 let update_fee = if self.is_outbound() && self.pending_update_fee.is_some() {
3389 Some(msgs::UpdateFee {
3390 channel_id: self.channel_id(),
3391 feerate_per_kw: self.pending_update_fee.unwrap().0,
3395 log_trace!(logger, "Regenerated latest commitment update in channel {} with{} {} update_adds, {} update_fulfills, {} update_fails, and {} update_fail_malformeds",
3396 log_bytes!(self.channel_id()), if update_fee.is_some() { " update_fee," } else { "" },
3397 update_add_htlcs.len(), update_fulfill_htlcs.len(), update_fail_htlcs.len(), update_fail_malformed_htlcs.len());
3398 msgs::CommitmentUpdate {
3399 update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs, update_fee,
3400 commitment_signed: self.send_commitment_no_state_update(logger).expect("It looks like we failed to re-generate a commitment_signed we had previously sent?").0,
3404 /// May panic if some calls other than message-handling calls (which will all Err immediately)
3405 /// have been called between remove_uncommitted_htlcs_and_mark_paused and this call.
3406 pub fn channel_reestablish<L: Deref>(&mut self, msg: &msgs::ChannelReestablish, logger: &L) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, Option<ChannelMonitorUpdate>, RAACommitmentOrder, Vec<(HTLCSource, PaymentHash)>, Option<msgs::Shutdown>), ChannelError> where L::Target: Logger {
3407 if self.channel_state & (ChannelState::PeerDisconnected as u32) == 0 {
3408 // While BOLT 2 doesn't indicate explicitly we should error this channel here, it
3409 // almost certainly indicates we are going to end up out-of-sync in some way, so we
3410 // just close here instead of trying to recover.
3411 return Err(ChannelError::Close("Peer sent a loose channel_reestablish not after reconnect".to_owned()));
3414 if msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
3415 msg.next_local_commitment_number == 0 {
3416 return Err(ChannelError::Close("Peer sent a garbage channel_reestablish".to_owned()));
3419 if msg.next_remote_commitment_number > 0 {
3420 match msg.data_loss_protect {
3421 OptionalField::Present(ref data_loss) => {
3422 let expected_point = self.holder_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.secp_ctx);
3423 let given_secret = SecretKey::from_slice(&data_loss.your_last_per_commitment_secret)
3424 .map_err(|_| ChannelError::Close("Peer sent a garbage channel_reestablish with unparseable secret key".to_owned()))?;
3425 if expected_point != PublicKey::from_secret_key(&self.secp_ctx, &given_secret) {
3426 return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
3428 if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
3429 return Err(ChannelError::CloseDelayBroadcast(
3430 "We have fallen behind - we have received proof that if we broadcast remote is going to claim our funds - we can't do any automated broadcasting".to_owned()
3434 OptionalField::Absent => {}
3438 // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
3439 // remaining cases either succeed or ErrorMessage-fail).
3440 self.channel_state &= !(ChannelState::PeerDisconnected as u32);
3442 let shutdown_msg = if self.channel_state & (ChannelState::LocalShutdownSent as u32) != 0 {
3443 assert!(self.shutdown_scriptpubkey.is_some());
3444 Some(msgs::Shutdown {
3445 channel_id: self.channel_id,
3446 scriptpubkey: self.get_closing_scriptpubkey(),
3450 if self.channel_state & (ChannelState::FundingSent as u32) == ChannelState::FundingSent as u32 {
3451 // If we're waiting on a monitor update, we shouldn't re-send any funding_locked's.
3452 if self.channel_state & (ChannelState::OurFundingLocked as u32) == 0 ||
3453 self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
3454 if msg.next_remote_commitment_number != 0 {
3455 return Err(ChannelError::Close("Peer claimed they saw a revoke_and_ack but we haven't sent funding_locked yet".to_owned()));
3457 // Short circuit the whole handler as there is nothing we can resend them
3458 return Ok((None, None, None, None, RAACommitmentOrder::CommitmentFirst, Vec::new(), shutdown_msg));
3461 // We have OurFundingLocked set!
3462 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
3463 return Ok((Some(msgs::FundingLocked {
3464 channel_id: self.channel_id(),
3465 next_per_commitment_point,
3466 }), None, None, None, RAACommitmentOrder::CommitmentFirst, Vec::new(), shutdown_msg));
3469 let required_revoke = if msg.next_remote_commitment_number + 1 == INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
3470 // Remote isn't waiting on any RevokeAndACK from us!
3471 // Note that if we need to repeat our FundingLocked we'll do that in the next if block.
3473 } else if msg.next_remote_commitment_number + 1 == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_holder_commitment_transaction_number {
3474 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
3475 self.monitor_pending_revoke_and_ack = true;
3478 Some(self.get_last_revoke_and_ack())
3481 return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old local commitment transaction".to_owned()));
3484 // We increment cur_counterparty_commitment_transaction_number only upon receipt of
3485 // revoke_and_ack, not on sending commitment_signed, so we add one if have
3486 // AwaitingRemoteRevoke set, which indicates we sent a commitment_signed but haven't gotten
3487 // the corresponding revoke_and_ack back yet.
3488 let next_counterparty_commitment_number = INITIAL_COMMITMENT_NUMBER - self.cur_counterparty_commitment_transaction_number + if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 };
3490 let resend_funding_locked = if msg.next_local_commitment_number == 1 && INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number == 1 {
3491 // We should never have to worry about MonitorUpdateFailed resending FundingLocked
3492 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
3493 Some(msgs::FundingLocked {
3494 channel_id: self.channel_id(),
3495 next_per_commitment_point,
3499 if msg.next_local_commitment_number == next_counterparty_commitment_number {
3500 if required_revoke.is_some() {
3501 log_debug!(logger, "Reconnected channel {} with only lost outbound RAA", log_bytes!(self.channel_id()));
3503 log_debug!(logger, "Reconnected channel {} with no loss", log_bytes!(self.channel_id()));
3506 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) == 0 {
3507 // We're up-to-date and not waiting on a remote revoke (if we are our
3508 // channel_reestablish should result in them sending a revoke_and_ack), but we may
3509 // have received some updates while we were disconnected. Free the holding cell
3511 match self.free_holding_cell_htlcs(logger) {
3512 Err(ChannelError::Close(msg)) => return Err(ChannelError::Close(msg)),
3513 Err(ChannelError::Warn(_)) | Err(ChannelError::Ignore(_)) | Err(ChannelError::CloseDelayBroadcast(_)) =>
3514 panic!("Got non-channel-failing result from free_holding_cell_htlcs"),
3515 Ok((Some((commitment_update, monitor_update)), htlcs_to_fail)) => {
3516 return Ok((resend_funding_locked, required_revoke, Some(commitment_update), Some(monitor_update), self.resend_order.clone(), htlcs_to_fail, shutdown_msg));
3518 Ok((None, htlcs_to_fail)) => {
3519 return Ok((resend_funding_locked, required_revoke, None, None, self.resend_order.clone(), htlcs_to_fail, shutdown_msg));
3523 return Ok((resend_funding_locked, required_revoke, None, None, self.resend_order.clone(), Vec::new(), shutdown_msg));
3525 } else if msg.next_local_commitment_number == next_counterparty_commitment_number - 1 {
3526 if required_revoke.is_some() {
3527 log_debug!(logger, "Reconnected channel {} with lost outbound RAA and lost remote commitment tx", log_bytes!(self.channel_id()));
3529 log_debug!(logger, "Reconnected channel {} with only lost remote commitment tx", log_bytes!(self.channel_id()));
3532 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
3533 self.monitor_pending_commitment_signed = true;
3534 return Ok((resend_funding_locked, None, None, None, self.resend_order.clone(), Vec::new(), shutdown_msg));
3537 return Ok((resend_funding_locked, required_revoke, Some(self.get_last_commitment_update(logger)), None, self.resend_order.clone(), Vec::new(), shutdown_msg));
3539 return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old remote commitment transaction".to_owned()));
3543 /// Calculates and returns our minimum and maximum closing transaction fee amounts, in whole
3544 /// satoshis. The amounts remain consistent unless a peer disconnects/reconnects or we restart,
3545 /// at which point they will be recalculated.
3546 fn calculate_closing_fee_limits<F: Deref>(&mut self, fee_estimator: &F) -> (u64, u64)
3547 where F::Target: FeeEstimator
3549 if let Some((min, max)) = self.closing_fee_limits { return (min, max); }
3551 // Propose a range from our current Background feerate to our Normal feerate plus our
3552 // force_close_avoidance_max_fee_satoshis.
3553 // If we fail to come to consensus, we'll have to force-close.
3554 let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
3555 let normal_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
3556 let mut proposed_max_feerate = if self.is_outbound() { normal_feerate } else { u32::max_value() };
3558 // The spec requires that (when the channel does not have anchors) we only send absolute
3559 // channel fees no greater than the absolute channel fee on the current commitment
3560 // transaction. It's unclear *which* commitment transaction this refers to, and there isn't
3561 // very good reason to apply such a limit in any case. We don't bother doing so, risking
3562 // some force-closure by old nodes, but we wanted to close the channel anyway.
3564 if let Some(target_feerate) = self.target_closing_feerate_sats_per_kw {
3565 let min_feerate = if self.is_outbound() { target_feerate } else { cmp::min(self.feerate_per_kw, target_feerate) };
3566 proposed_feerate = cmp::max(proposed_feerate, min_feerate);
3567 proposed_max_feerate = cmp::max(proposed_max_feerate, min_feerate);
3570 // Note that technically we could end up with a lower minimum fee if one sides' balance is
3571 // below our dust limit, causing the output to disappear. We don't bother handling this
3572 // case, however, as this should only happen if a channel is closed before any (material)
3573 // payments have been made on it. This may cause slight fee overpayment and/or failure to
3574 // come to consensus with our counterparty on appropriate fees, however it should be a
3575 // relatively rare case. We can revisit this later, though note that in order to determine
3576 // if the funders' output is dust we have to know the absolute fee we're going to use.
3577 let tx_weight = self.get_closing_transaction_weight(Some(&self.get_closing_scriptpubkey()), Some(self.counterparty_shutdown_scriptpubkey.as_ref().unwrap()));
3578 let proposed_total_fee_satoshis = proposed_feerate as u64 * tx_weight / 1000;
3579 let proposed_max_total_fee_satoshis = if self.is_outbound() {
3580 // We always add force_close_avoidance_max_fee_satoshis to our normal
3581 // feerate-calculated fee, but allow the max to be overridden if we're using a
3582 // target feerate-calculated fee.
3583 cmp::max(normal_feerate as u64 * tx_weight / 1000 + self.config.force_close_avoidance_max_fee_satoshis,
3584 proposed_max_feerate as u64 * tx_weight / 1000)
3586 self.channel_value_satoshis - (self.value_to_self_msat + 999) / 1000
3589 self.closing_fee_limits = Some((proposed_total_fee_satoshis, proposed_max_total_fee_satoshis));
3590 self.closing_fee_limits.clone().unwrap()
3593 /// Returns true if we're ready to commence the closing_signed negotiation phase. This is true
3594 /// after both sides have exchanged a `shutdown` message and all HTLCs have been drained. At
3595 /// this point if we're the funder we should send the initial closing_signed, and in any case
3596 /// shutdown should complete within a reasonable timeframe.
3597 fn closing_negotiation_ready(&self) -> bool {
3598 self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() &&
3599 self.channel_state &
3600 (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32 |
3601 ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)
3602 == BOTH_SIDES_SHUTDOWN_MASK &&
3603 self.pending_update_fee.is_none()
3606 /// Checks if the closing_signed negotiation is making appropriate progress, possibly returning
3607 /// an Err if no progress is being made and the channel should be force-closed instead.
3608 /// Should be called on a one-minute timer.
3609 pub fn timer_check_closing_negotiation_progress(&mut self) -> Result<(), ChannelError> {
3610 if self.closing_negotiation_ready() {
3611 if self.closing_signed_in_flight {
3612 return Err(ChannelError::Close("closing_signed negotiation failed to finish within two timer ticks".to_owned()));
3614 self.closing_signed_in_flight = true;
3620 pub fn maybe_propose_closing_signed<F: Deref, L: Deref>(&mut self, fee_estimator: &F, logger: &L)
3621 -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), ChannelError>
3622 where F::Target: FeeEstimator, L::Target: Logger
3624 if self.last_sent_closing_fee.is_some() || !self.closing_negotiation_ready() {
3625 return Ok((None, None));
3628 if !self.is_outbound() {
3629 if let Some(msg) = &self.pending_counterparty_closing_signed.take() {
3630 return self.closing_signed(fee_estimator, &msg);
3632 return Ok((None, None));
3635 let (our_min_fee, our_max_fee) = self.calculate_closing_fee_limits(fee_estimator);
3637 assert!(self.shutdown_scriptpubkey.is_some());
3638 let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(our_min_fee, false);
3639 log_trace!(logger, "Proposing initial closing_signed for our counterparty with a fee range of {}-{} sat (with initial proposal {} sats)",
3640 our_min_fee, our_max_fee, total_fee_satoshis);
3642 let sig = self.holder_signer
3643 .sign_closing_transaction(&closing_tx, &self.secp_ctx)
3644 .map_err(|()| ChannelError::Close("Failed to get signature for closing transaction.".to_owned()))?;
3646 self.last_sent_closing_fee = Some((total_fee_satoshis, sig.clone()));
3647 Ok((Some(msgs::ClosingSigned {
3648 channel_id: self.channel_id,
3649 fee_satoshis: total_fee_satoshis,
3651 fee_range: Some(msgs::ClosingSignedFeeRange {
3652 min_fee_satoshis: our_min_fee,
3653 max_fee_satoshis: our_max_fee,
3658 pub fn shutdown<K: Deref>(
3659 &mut self, keys_provider: &K, their_features: &InitFeatures, msg: &msgs::Shutdown
3660 ) -> Result<(Option<msgs::Shutdown>, Option<ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), ChannelError>
3661 where K::Target: KeysInterface<Signer = Signer>
3663 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
3664 return Err(ChannelError::Close("Peer sent shutdown when we needed a channel_reestablish".to_owned()));
3666 if self.channel_state < ChannelState::FundingSent as u32 {
3667 // Spec says we should fail the connection, not the channel, but that's nonsense, there
3668 // are plenty of reasons you may want to fail a channel pre-funding, and spec says you
3669 // can do that via error message without getting a connection fail anyway...
3670 return Err(ChannelError::Close("Peer sent shutdown pre-funding generation".to_owned()));
3672 for htlc in self.pending_inbound_htlcs.iter() {
3673 if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
3674 return Err(ChannelError::Close("Got shutdown with remote pending HTLCs".to_owned()));
3677 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
3679 if !script::is_bolt2_compliant(&msg.scriptpubkey, their_features) {
3680 return Err(ChannelError::Close(format!("Got a nonstandard scriptpubkey ({}) from remote peer", msg.scriptpubkey.to_bytes().to_hex())));
3683 if self.counterparty_shutdown_scriptpubkey.is_some() {
3684 if Some(&msg.scriptpubkey) != self.counterparty_shutdown_scriptpubkey.as_ref() {
3685 return Err(ChannelError::Close(format!("Got shutdown request with a scriptpubkey ({}) which did not match their previous scriptpubkey.", msg.scriptpubkey.to_bytes().to_hex())));
3688 self.counterparty_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
3691 // If we have any LocalAnnounced updates we'll probably just get back an update_fail_htlc
3692 // immediately after the commitment dance, but we can send a Shutdown because we won't send
3693 // any further commitment updates after we set LocalShutdownSent.
3694 let send_shutdown = (self.channel_state & ChannelState::LocalShutdownSent as u32) != ChannelState::LocalShutdownSent as u32;
3696 let update_shutdown_script = match self.shutdown_scriptpubkey {
3699 assert!(send_shutdown);
3700 let shutdown_scriptpubkey = keys_provider.get_shutdown_scriptpubkey();
3701 if !shutdown_scriptpubkey.is_compatible(their_features) {
3702 return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
3704 self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
3709 // From here on out, we may not fail!
3711 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
3712 self.update_time_counter += 1;
3714 let monitor_update = if update_shutdown_script {
3715 self.latest_monitor_update_id += 1;
3716 Some(ChannelMonitorUpdate {
3717 update_id: self.latest_monitor_update_id,
3718 updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
3719 scriptpubkey: self.get_closing_scriptpubkey(),
3723 let shutdown = if send_shutdown {
3724 Some(msgs::Shutdown {
3725 channel_id: self.channel_id,
3726 scriptpubkey: self.get_closing_scriptpubkey(),
3730 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
3731 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
3732 // cell HTLCs and return them to fail the payment.
3733 self.holding_cell_update_fee = None;
3734 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3735 self.holding_cell_htlc_updates.retain(|htlc_update| {
3737 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
3738 dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
3745 self.channel_state |= ChannelState::LocalShutdownSent as u32;
3746 self.update_time_counter += 1;
3748 Ok((shutdown, monitor_update, dropped_outbound_htlcs))
3751 fn build_signed_closing_transaction(&self, closing_tx: &ClosingTransaction, counterparty_sig: &Signature, sig: &Signature) -> Transaction {
3752 let mut tx = closing_tx.trust().built_transaction().clone();
3754 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
3756 let funding_key = self.get_holder_pubkeys().funding_pubkey.serialize();
3757 let counterparty_funding_key = self.counterparty_funding_pubkey().serialize();
3758 if funding_key[..] < counterparty_funding_key[..] {
3759 tx.input[0].witness.push(sig.serialize_der().to_vec());
3760 tx.input[0].witness.push(counterparty_sig.serialize_der().to_vec());
3762 tx.input[0].witness.push(counterparty_sig.serialize_der().to_vec());
3763 tx.input[0].witness.push(sig.serialize_der().to_vec());
3765 tx.input[0].witness[1].push(SigHashType::All as u8);
3766 tx.input[0].witness[2].push(SigHashType::All as u8);
3768 tx.input[0].witness.push(self.get_funding_redeemscript().into_bytes());
3772 pub fn closing_signed<F: Deref>(&mut self, fee_estimator: &F, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), ChannelError>
3773 where F::Target: FeeEstimator
3775 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
3776 return Err(ChannelError::Close("Remote end sent us a closing_signed before both sides provided a shutdown".to_owned()));
3778 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
3779 return Err(ChannelError::Close("Peer sent closing_signed when we needed a channel_reestablish".to_owned()));
3781 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
3782 return Err(ChannelError::Close("Remote end sent us a closing_signed while there were still pending HTLCs".to_owned()));
3784 if msg.fee_satoshis > 21_000_000 * 1_0000_0000 { //this is required to stop potential overflow in build_closing_transaction
3785 return Err(ChannelError::Close("Remote tried to send us a closing tx with > 21 million BTC fee".to_owned()));
3788 if self.is_outbound() && self.last_sent_closing_fee.is_none() {
3789 return Err(ChannelError::Close("Remote tried to send a closing_signed when we were supposed to propose the first one".to_owned()));
3792 if self.channel_state & ChannelState::MonitorUpdateFailed as u32 != 0 {
3793 self.pending_counterparty_closing_signed = Some(msg.clone());
3794 return Ok((None, None));
3797 let funding_redeemscript = self.get_funding_redeemscript();
3798 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
3799 if used_total_fee != msg.fee_satoshis {
3800 return Err(ChannelError::Close(format!("Remote sent us a closing_signed with a fee other than the value they can claim. Fee in message: {}. Actual closing tx fee: {}", msg.fee_satoshis, used_total_fee)));
3802 let sighash = closing_tx.trust().get_sighash_all(&funding_redeemscript, self.channel_value_satoshis);
3804 match self.secp_ctx.verify(&sighash, &msg.signature, &self.get_counterparty_pubkeys().funding_pubkey) {
3807 // The remote end may have decided to revoke their output due to inconsistent dust
3808 // limits, so check for that case by re-checking the signature here.
3809 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
3810 let sighash = closing_tx.trust().get_sighash_all(&funding_redeemscript, self.channel_value_satoshis);
3811 secp_check!(self.secp_ctx.verify(&sighash, &msg.signature, self.counterparty_funding_pubkey()), "Invalid closing tx signature from peer".to_owned());
3815 for outp in closing_tx.trust().built_transaction().output.iter() {
3816 if !outp.script_pubkey.is_witness_program() && outp.value < MAX_STD_OUTPUT_DUST_LIMIT_SATOSHIS {
3817 return Err(ChannelError::Close("Remote sent us a closing_signed with a dust output. Always use segwit closing scripts!".to_owned()));
3821 assert!(self.shutdown_scriptpubkey.is_some());
3822 if let Some((last_fee, sig)) = self.last_sent_closing_fee {
3823 if last_fee == msg.fee_satoshis {
3824 let tx = self.build_signed_closing_transaction(&mut closing_tx, &msg.signature, &sig);
3825 self.channel_state = ChannelState::ShutdownComplete as u32;
3826 self.update_time_counter += 1;
3827 return Ok((None, Some(tx)));
3831 let (our_min_fee, our_max_fee) = self.calculate_closing_fee_limits(fee_estimator);
3833 macro_rules! propose_fee {
3834 ($new_fee: expr) => {
3835 let (closing_tx, used_fee) = if $new_fee == msg.fee_satoshis {
3836 (closing_tx, $new_fee)
3838 self.build_closing_transaction($new_fee, false)
3841 let sig = self.holder_signer
3842 .sign_closing_transaction(&closing_tx, &self.secp_ctx)
3843 .map_err(|_| ChannelError::Close("External signer refused to sign closing transaction".to_owned()))?;
3845 let signed_tx = if $new_fee == msg.fee_satoshis {
3846 self.channel_state = ChannelState::ShutdownComplete as u32;
3847 self.update_time_counter += 1;
3848 let tx = self.build_signed_closing_transaction(&closing_tx, &msg.signature, &sig);
3852 self.last_sent_closing_fee = Some((used_fee, sig.clone()));
3853 return Ok((Some(msgs::ClosingSigned {
3854 channel_id: self.channel_id,
3855 fee_satoshis: used_fee,
3857 fee_range: Some(msgs::ClosingSignedFeeRange {
3858 min_fee_satoshis: our_min_fee,
3859 max_fee_satoshis: our_max_fee,
3865 if let Some(msgs::ClosingSignedFeeRange { min_fee_satoshis, max_fee_satoshis }) = msg.fee_range {
3866 if msg.fee_satoshis < min_fee_satoshis || msg.fee_satoshis > max_fee_satoshis {
3867 return Err(ChannelError::Close(format!("Peer sent a bogus closing_signed - suggested fee of {} sat was not in their desired range of {} sat - {} sat", msg.fee_satoshis, min_fee_satoshis, max_fee_satoshis)));
3869 if max_fee_satoshis < our_min_fee {
3870 return Err(ChannelError::Warn(format!("Unable to come to consensus about closing feerate, remote's max fee ({} sat) was smaller than our min fee ({} sat)", max_fee_satoshis, our_min_fee)));
3872 if min_fee_satoshis > our_max_fee {
3873 return Err(ChannelError::Warn(format!("Unable to come to consensus about closing feerate, remote's min fee ({} sat) was greater than our max fee ({} sat)", min_fee_satoshis, our_max_fee)));
3876 if !self.is_outbound() {
3877 // They have to pay, so pick the highest fee in the overlapping range.
3878 // We should never set an upper bound aside from their full balance
3879 debug_assert_eq!(our_max_fee, self.channel_value_satoshis - (self.value_to_self_msat + 999) / 1000);
3880 propose_fee!(cmp::min(max_fee_satoshis, our_max_fee));
3882 if msg.fee_satoshis < our_min_fee || msg.fee_satoshis > our_max_fee {
3883 return Err(ChannelError::Close(format!("Peer sent a bogus closing_signed - suggested fee of {} sat was not in our desired range of {} sat - {} sat after we informed them of our range.",
3884 msg.fee_satoshis, our_min_fee, our_max_fee)));
3886 // The proposed fee is in our acceptable range, accept it and broadcast!
3887 propose_fee!(msg.fee_satoshis);
3890 // Old fee style negotiation. We don't bother to enforce whether they are complying
3891 // with the "making progress" requirements, we just comply and hope for the best.
3892 if let Some((last_fee, _)) = self.last_sent_closing_fee {
3893 if msg.fee_satoshis > last_fee {
3894 if msg.fee_satoshis < our_max_fee {
3895 propose_fee!(msg.fee_satoshis);
3896 } else if last_fee < our_max_fee {
3897 propose_fee!(our_max_fee);
3899 return Err(ChannelError::Close(format!("Unable to come to consensus about closing feerate, remote wants something ({} sat) higher than our max fee ({} sat)", msg.fee_satoshis, our_max_fee)));
3902 if msg.fee_satoshis > our_min_fee {
3903 propose_fee!(msg.fee_satoshis);
3904 } else if last_fee > our_min_fee {
3905 propose_fee!(our_min_fee);
3907 return Err(ChannelError::Close(format!("Unable to come to consensus about closing feerate, remote wants something ({} sat) lower than our min fee ({} sat)", msg.fee_satoshis, our_min_fee)));
3911 if msg.fee_satoshis < our_min_fee {
3912 propose_fee!(our_min_fee);
3913 } else if msg.fee_satoshis > our_max_fee {
3914 propose_fee!(our_max_fee);
3916 propose_fee!(msg.fee_satoshis);
3922 // Public utilities:
3924 pub fn channel_id(&self) -> [u8; 32] {
3928 pub fn minimum_depth(&self) -> Option<u32> {
3932 /// Gets the "user_id" value passed into the construction of this channel. It has no special
3933 /// meaning and exists only to allow users to have a persistent identifier of a channel.
3934 pub fn get_user_id(&self) -> u64 {
3938 /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
3939 /// is_usable() returns true).
3940 /// Allowed in any state (including after shutdown)
3941 pub fn get_short_channel_id(&self) -> Option<u64> {
3942 self.short_channel_id
3945 /// Returns the funding_txo we either got from our peer, or were given by
3946 /// get_outbound_funding_created.
3947 pub fn get_funding_txo(&self) -> Option<OutPoint> {
3948 self.channel_transaction_parameters.funding_outpoint
3951 fn get_holder_selected_contest_delay(&self) -> u16 {
3952 self.channel_transaction_parameters.holder_selected_contest_delay
3955 fn get_holder_pubkeys(&self) -> &ChannelPublicKeys {
3956 &self.channel_transaction_parameters.holder_pubkeys
3959 pub fn get_counterparty_selected_contest_delay(&self) -> Option<u16> {
3960 self.channel_transaction_parameters.counterparty_parameters
3961 .as_ref().map(|params| params.selected_contest_delay)
3964 fn get_counterparty_pubkeys(&self) -> &ChannelPublicKeys {
3965 &self.channel_transaction_parameters.counterparty_parameters.as_ref().unwrap().pubkeys
3968 /// Allowed in any state (including after shutdown)
3969 pub fn get_counterparty_node_id(&self) -> PublicKey {
3970 self.counterparty_node_id
3973 /// Allowed in any state (including after shutdown)
3975 pub fn get_holder_htlc_minimum_msat(&self) -> u64 {
3976 self.holder_htlc_minimum_msat
3979 /// Allowed in any state (including after shutdown)
3980 pub fn get_announced_htlc_max_msat(&self) -> u64 {
3982 // Upper bound by capacity. We make it a bit less than full capacity to prevent attempts
3983 // to use full capacity. This is an effort to reduce routing failures, because in many cases
3984 // channel might have been used to route very small values (either by honest users or as DoS).
3985 self.channel_value_satoshis * 1000 * 9 / 10,
3987 Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis)
3991 /// Allowed in any state (including after shutdown)
3992 pub fn get_counterparty_htlc_minimum_msat(&self) -> u64 {
3993 self.counterparty_htlc_minimum_msat
3996 pub fn get_value_satoshis(&self) -> u64 {
3997 self.channel_value_satoshis
4000 pub fn get_fee_proportional_millionths(&self) -> u32 {
4001 self.config.forwarding_fee_proportional_millionths
4004 pub fn get_cltv_expiry_delta(&self) -> u16 {
4005 cmp::max(self.config.cltv_expiry_delta, MIN_CLTV_EXPIRY_DELTA)
4008 pub fn get_max_dust_htlc_exposure_msat(&self) -> u64 {
4009 self.config.max_dust_htlc_exposure_msat
4012 pub fn get_feerate(&self) -> u32 {
4016 pub fn get_dust_buffer_feerate(&self, outbound_feerate_update: Option<u32>) -> u32 {
4017 // When calculating our exposure to dust HTLCs, we assume that the channel feerate
4018 // may, at any point, increase by at least 10 sat/vB (i.e 2530 sat/kWU) or 25%,
4019 // whichever is higher. This ensures that we aren't suddenly exposed to significantly
4020 // more dust balance if the feerate increases when we have several HTLCs pending
4021 // which are near the dust limit.
4022 let mut feerate_per_kw = self.feerate_per_kw;
4023 // If there's a pending update fee, use it to ensure we aren't under-estimating
4024 // potential feerate updates coming soon.
4025 if let Some((feerate, _)) = self.pending_update_fee {
4026 feerate_per_kw = cmp::max(feerate_per_kw, feerate);
4028 if let Some(feerate) = outbound_feerate_update {
4029 feerate_per_kw = cmp::max(feerate_per_kw, feerate);
4031 cmp::max(2530, feerate_per_kw * 1250 / 1000)
4034 pub fn get_cur_holder_commitment_transaction_number(&self) -> u64 {
4035 self.cur_holder_commitment_transaction_number + 1
4038 pub fn get_cur_counterparty_commitment_transaction_number(&self) -> u64 {
4039 self.cur_counterparty_commitment_transaction_number + 1 - if self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 }
4042 pub fn get_revoked_counterparty_commitment_transaction_number(&self) -> u64 {
4043 self.cur_counterparty_commitment_transaction_number + 2
4047 pub fn get_signer(&self) -> &Signer {
4052 pub fn get_value_stat(&self) -> ChannelValueStat {
4054 value_to_self_msat: self.value_to_self_msat,
4055 channel_value_msat: self.channel_value_satoshis * 1000,
4056 channel_reserve_msat: self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000,
4057 pending_outbound_htlcs_amount_msat: self.pending_outbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
4058 pending_inbound_htlcs_amount_msat: self.pending_inbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
4059 holding_cell_outbound_amount_msat: {
4061 for h in self.holding_cell_htlc_updates.iter() {
4063 &HTLCUpdateAwaitingACK::AddHTLC{amount_msat, .. } => {
4071 counterparty_max_htlc_value_in_flight_msat: self.counterparty_max_htlc_value_in_flight_msat,
4072 counterparty_dust_limit_msat: self.counterparty_dust_limit_satoshis * 1000,
4076 /// Allowed in any state (including after shutdown)
4077 pub fn get_update_time_counter(&self) -> u32 {
4078 self.update_time_counter
4081 pub fn get_latest_monitor_update_id(&self) -> u64 {
4082 self.latest_monitor_update_id
4085 pub fn should_announce(&self) -> bool {
4086 self.config.announced_channel
4089 pub fn is_outbound(&self) -> bool {
4090 self.channel_transaction_parameters.is_outbound_from_holder
4093 /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
4094 /// Allowed in any state (including after shutdown)
4095 pub fn get_outbound_forwarding_fee_base_msat(&self) -> u32 {
4096 self.config.forwarding_fee_base_msat
4099 /// Returns true if we've ever received a message from the remote end for this Channel
4100 pub fn have_received_message(&self) -> bool {
4101 self.channel_state > (ChannelState::OurInitSent as u32)
4104 /// Returns true if this channel is fully established and not known to be closing.
4105 /// Allowed in any state (including after shutdown)
4106 pub fn is_usable(&self) -> bool {
4107 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
4108 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
4111 /// Returns true if this channel is currently available for use. This is a superset of
4112 /// is_usable() and considers things like the channel being temporarily disabled.
4113 /// Allowed in any state (including after shutdown)
4114 pub fn is_live(&self) -> bool {
4115 self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32) == 0)
4118 /// Returns true if this channel has been marked as awaiting a monitor update to move forward.
4119 /// Allowed in any state (including after shutdown)
4120 pub fn is_awaiting_monitor_update(&self) -> bool {
4121 (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0
4124 /// Returns true if funding_created was sent/received.
4125 pub fn is_funding_initiated(&self) -> bool {
4126 self.channel_state >= ChannelState::FundingSent as u32
4129 /// Returns true if our peer has either initiated or agreed to shut down the channel.
4130 pub fn received_shutdown(&self) -> bool {
4131 (self.channel_state & ChannelState::RemoteShutdownSent as u32) != 0
4134 /// Returns true if we either initiated or agreed to shut down the channel.
4135 pub fn sent_shutdown(&self) -> bool {
4136 (self.channel_state & ChannelState::LocalShutdownSent as u32) != 0
4139 /// Returns true if this channel is fully shut down. True here implies that no further actions
4140 /// may/will be taken on this channel, and thus this object should be freed. Any future changes
4141 /// will be handled appropriately by the chain monitor.
4142 pub fn is_shutdown(&self) -> bool {
4143 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32 {
4144 assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
4149 pub fn channel_update_status(&self) -> ChannelUpdateStatus {
4150 self.channel_update_status
4153 pub fn set_channel_update_status(&mut self, status: ChannelUpdateStatus) {
4154 self.channel_update_status = status;
4157 fn check_get_funding_locked(&mut self, height: u32) -> Option<msgs::FundingLocked> {
4158 if self.funding_tx_confirmation_height == 0 {
4162 let funding_tx_confirmations = height as i64 - self.funding_tx_confirmation_height as i64 + 1;
4163 if funding_tx_confirmations <= 0 {
4164 self.funding_tx_confirmation_height = 0;
4167 if funding_tx_confirmations < self.minimum_depth.unwrap_or(0) as i64 {
4171 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
4172 let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
4173 self.channel_state |= ChannelState::OurFundingLocked as u32;
4175 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
4176 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
4177 self.update_time_counter += 1;
4179 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
4180 // We got a reorg but not enough to trigger a force close, just ignore.
4182 } else if self.channel_state < ChannelState::ChannelFunded as u32 {
4183 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
4185 // We got a reorg but not enough to trigger a force close, just ignore.
4189 if need_commitment_update {
4190 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
4191 let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
4192 return Some(msgs::FundingLocked {
4193 channel_id: self.channel_id,
4194 next_per_commitment_point,
4197 self.monitor_pending_funding_locked = true;
4203 /// When a transaction is confirmed, we check whether it is or spends the funding transaction
4204 /// In the first case, we store the confirmation height and calculating the short channel id.
4205 /// In the second, we simply return an Err indicating we need to be force-closed now.
4206 pub fn transactions_confirmed<L: Deref>(&mut self, block_hash: &BlockHash, height: u32, txdata: &TransactionData, logger: &L)
4207 -> Result<Option<msgs::FundingLocked>, ClosureReason> where L::Target: Logger {
4208 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
4209 for &(index_in_block, tx) in txdata.iter() {
4210 if let Some(funding_txo) = self.get_funding_txo() {
4211 // If we haven't yet sent a funding_locked, but are in FundingSent (ignoring
4212 // whether they've sent a funding_locked or not), check if we should send one.
4213 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
4214 if tx.txid() == funding_txo.txid {
4215 let txo_idx = funding_txo.index as usize;
4216 if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
4217 tx.output[txo_idx].value != self.channel_value_satoshis {
4218 if self.is_outbound() {
4219 // If we generated the funding transaction and it doesn't match what it
4220 // should, the client is really broken and we should just panic and
4221 // tell them off. That said, because hash collisions happen with high
4222 // probability in fuzztarget mode, if we're fuzzing we just close the
4223 // channel and move on.
4224 #[cfg(not(feature = "fuzztarget"))]
4225 panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
4227 self.update_time_counter += 1;
4228 let err_reason = "funding tx had wrong script/value or output index";
4229 return Err(ClosureReason::ProcessingError { err: err_reason.to_owned() });
4231 if self.is_outbound() {
4232 for input in tx.input.iter() {
4233 if input.witness.is_empty() {
4234 // We generated a malleable funding transaction, implying we've
4235 // just exposed ourselves to funds loss to our counterparty.
4236 #[cfg(not(feature = "fuzztarget"))]
4237 panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
4241 self.funding_tx_confirmation_height = height;
4242 self.funding_tx_confirmed_in = Some(*block_hash);
4243 self.short_channel_id = match scid_from_parts(height as u64, index_in_block as u64, txo_idx as u64) {
4244 Ok(scid) => Some(scid),
4245 Err(_) => panic!("Block was bogus - either height was > 16 million, had > 16 million transactions, or had > 65k outputs"),
4249 // If we allow 1-conf funding, we may need to check for funding_locked here and
4250 // send it immediately instead of waiting for a best_block_updated call (which
4251 // may have already happened for this block).
4252 if let Some(funding_locked) = self.check_get_funding_locked(height) {
4253 log_info!(logger, "Sending a funding_locked to our peer for channel {}", log_bytes!(self.channel_id));
4254 return Ok(Some(funding_locked));
4257 for inp in tx.input.iter() {
4258 if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
4259 log_info!(logger, "Detected channel-closing tx {} spending {}:{}, closing channel {}", tx.txid(), inp.previous_output.txid, inp.previous_output.vout, log_bytes!(self.channel_id()));
4260 return Err(ClosureReason::CommitmentTxConfirmed);
4268 /// When a new block is connected, we check the height of the block against outbound holding
4269 /// cell HTLCs in case we need to give up on them prematurely and time them out. Everything
4270 /// else (e.g. commitment transaction broadcasts, HTLC transaction broadcasting, etc) is
4271 /// handled by the ChannelMonitor.
4273 /// If we return Err, the channel may have been closed, at which point the standard
4274 /// requirements apply - no calls may be made except those explicitly stated to be allowed
4277 /// May return some HTLCs (and their payment_hash) which have timed out and should be failed
4279 pub fn best_block_updated<L: Deref>(&mut self, height: u32, highest_header_time: u32, logger: &L)
4280 -> Result<(Option<msgs::FundingLocked>, Vec<(HTLCSource, PaymentHash)>), ClosureReason> where L::Target: Logger {
4281 let mut timed_out_htlcs = Vec::new();
4282 // This mirrors the check in ChannelManager::decode_update_add_htlc_onion, refusing to
4283 // forward an HTLC when our counterparty should almost certainly just fail it for expiring
4285 let unforwarded_htlc_cltv_limit = height + LATENCY_GRACE_PERIOD_BLOCKS;
4286 self.holding_cell_htlc_updates.retain(|htlc_update| {
4288 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, ref cltv_expiry, .. } => {
4289 if *cltv_expiry <= unforwarded_htlc_cltv_limit {
4290 timed_out_htlcs.push((source.clone(), payment_hash.clone()));
4298 self.update_time_counter = cmp::max(self.update_time_counter, highest_header_time);
4300 if let Some(funding_locked) = self.check_get_funding_locked(height) {
4301 log_info!(logger, "Sending a funding_locked to our peer for channel {}", log_bytes!(self.channel_id));
4302 return Ok((Some(funding_locked), timed_out_htlcs));
4305 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
4306 if non_shutdown_state >= ChannelState::ChannelFunded as u32 ||
4307 (non_shutdown_state & ChannelState::OurFundingLocked as u32) == ChannelState::OurFundingLocked as u32 {
4308 let mut funding_tx_confirmations = height as i64 - self.funding_tx_confirmation_height as i64 + 1;
4309 if self.funding_tx_confirmation_height == 0 {
4310 // Note that check_get_funding_locked may reset funding_tx_confirmation_height to
4311 // zero if it has been reorged out, however in either case, our state flags
4312 // indicate we've already sent a funding_locked
4313 funding_tx_confirmations = 0;
4316 // If we've sent funding_locked (or have both sent and received funding_locked), and
4317 // the funding transaction's confirmation count has dipped below minimum_depth / 2,
4318 // close the channel and hope we can get the latest state on chain (because presumably
4319 // the funding transaction is at least still in the mempool of most nodes).
4320 if funding_tx_confirmations < self.minimum_depth.unwrap() as i64 / 2 {
4321 let err_reason = format!("Funding transaction was un-confirmed. Locked at {} confs, now have {} confs.",
4322 self.minimum_depth.unwrap(), funding_tx_confirmations);
4323 return Err(ClosureReason::ProcessingError { err: err_reason });
4325 } else if !self.is_outbound() && self.funding_tx_confirmed_in.is_none() &&
4326 height >= self.channel_creation_height + FUNDING_CONF_DEADLINE_BLOCKS {
4327 log_info!(logger, "Closing channel {} due to funding timeout", log_bytes!(self.channel_id));
4328 // If funding_tx_confirmed_in is unset, the channel must not be active
4329 assert!(non_shutdown_state <= ChannelState::ChannelFunded as u32);
4330 assert_eq!(non_shutdown_state & ChannelState::OurFundingLocked as u32, 0);
4331 return Err(ClosureReason::FundingTimedOut);
4334 Ok((None, timed_out_htlcs))
4337 /// Indicates the funding transaction is no longer confirmed in the main chain. This may
4338 /// force-close the channel, but may also indicate a harmless reorganization of a block or two
4339 /// before the channel has reached funding_locked and we can just wait for more blocks.
4340 pub fn funding_transaction_unconfirmed<L: Deref>(&mut self, logger: &L) -> Result<(), ClosureReason> where L::Target: Logger {
4341 if self.funding_tx_confirmation_height != 0 {
4342 // We handle the funding disconnection by calling best_block_updated with a height one
4343 // below where our funding was connected, implying a reorg back to conf_height - 1.
4344 let reorg_height = self.funding_tx_confirmation_height - 1;
4345 // We use the time field to bump the current time we set on channel updates if its
4346 // larger. If we don't know that time has moved forward, we can just set it to the last
4347 // time we saw and it will be ignored.
4348 let best_time = self.update_time_counter;
4349 match self.best_block_updated(reorg_height, best_time, logger) {
4350 Ok((funding_locked, timed_out_htlcs)) => {
4351 assert!(funding_locked.is_none(), "We can't generate a funding with 0 confirmations?");
4352 assert!(timed_out_htlcs.is_empty(), "We can't have accepted HTLCs with a timeout before our funding confirmation?");
4358 // We never learned about the funding confirmation anyway, just ignore
4363 // Methods to get unprompted messages to send to the remote end (or where we already returned
4364 // something in the handler for the message that prompted this message):
4366 pub fn get_open_channel(&self, chain_hash: BlockHash) -> msgs::OpenChannel {
4367 if !self.is_outbound() {
4368 panic!("Tried to open a channel for an inbound channel?");
4370 if self.channel_state != ChannelState::OurInitSent as u32 {
4371 panic!("Cannot generate an open_channel after we've moved forward");
4374 if self.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
4375 panic!("Tried to send an open_channel for a channel that has already advanced");
4378 let first_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
4379 let keys = self.get_holder_pubkeys();
4383 temporary_channel_id: self.channel_id,
4384 funding_satoshis: self.channel_value_satoshis,
4385 push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
4386 dust_limit_satoshis: self.holder_dust_limit_satoshis,
4387 max_htlc_value_in_flight_msat: Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
4388 channel_reserve_satoshis: Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis),
4389 htlc_minimum_msat: self.holder_htlc_minimum_msat,
4390 feerate_per_kw: self.feerate_per_kw as u32,
4391 to_self_delay: self.get_holder_selected_contest_delay(),
4392 max_accepted_htlcs: OUR_MAX_HTLCS,
4393 funding_pubkey: keys.funding_pubkey,
4394 revocation_basepoint: keys.revocation_basepoint,
4395 payment_point: keys.payment_point,
4396 delayed_payment_basepoint: keys.delayed_payment_basepoint,
4397 htlc_basepoint: keys.htlc_basepoint,
4398 first_per_commitment_point,
4399 channel_flags: if self.config.announced_channel {1} else {0},
4400 shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
4401 Some(script) => script.clone().into_inner(),
4402 None => Builder::new().into_script(),
4404 channel_type: Some(self.channel_type.clone()),
4408 pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
4409 if self.is_outbound() {
4410 panic!("Tried to send accept_channel for an outbound channel?");
4412 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
4413 panic!("Tried to send accept_channel after channel had moved forward");
4415 if self.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
4416 panic!("Tried to send an accept_channel for a channel that has already advanced");
4419 let first_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number, &self.secp_ctx);
4420 let keys = self.get_holder_pubkeys();
4422 msgs::AcceptChannel {
4423 temporary_channel_id: self.channel_id,
4424 dust_limit_satoshis: self.holder_dust_limit_satoshis,
4425 max_htlc_value_in_flight_msat: Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
4426 channel_reserve_satoshis: Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis),
4427 htlc_minimum_msat: self.holder_htlc_minimum_msat,
4428 minimum_depth: self.minimum_depth.unwrap(),
4429 to_self_delay: self.get_holder_selected_contest_delay(),
4430 max_accepted_htlcs: OUR_MAX_HTLCS,
4431 funding_pubkey: keys.funding_pubkey,
4432 revocation_basepoint: keys.revocation_basepoint,
4433 payment_point: keys.payment_point,
4434 delayed_payment_basepoint: keys.delayed_payment_basepoint,
4435 htlc_basepoint: keys.htlc_basepoint,
4436 first_per_commitment_point,
4437 shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
4438 Some(script) => script.clone().into_inner(),
4439 None => Builder::new().into_script(),
4444 /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
4445 fn get_outbound_funding_created_signature<L: Deref>(&mut self, logger: &L) -> Result<Signature, ChannelError> where L::Target: Logger {
4446 let counterparty_keys = self.build_remote_transaction_keys()?;
4447 let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).tx;
4448 Ok(self.holder_signer.sign_counterparty_commitment(&counterparty_initial_commitment_tx, &self.secp_ctx)
4449 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed".to_owned()))?.0)
4452 /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
4453 /// a funding_created message for the remote peer.
4454 /// Panics if called at some time other than immediately after initial handshake, if called twice,
4455 /// or if called on an inbound channel.
4456 /// Note that channel_id changes during this call!
4457 /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
4458 /// If an Err is returned, it is a ChannelError::Close.
4459 pub fn get_outbound_funding_created<L: Deref>(&mut self, funding_transaction: Transaction, funding_txo: OutPoint, logger: &L) -> Result<msgs::FundingCreated, ChannelError> where L::Target: Logger {
4460 if !self.is_outbound() {
4461 panic!("Tried to create outbound funding_created message on an inbound channel!");
4463 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
4464 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)");
4466 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
4467 self.cur_counterparty_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
4468 self.cur_holder_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
4469 panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
4472 self.channel_transaction_parameters.funding_outpoint = Some(funding_txo);
4473 self.holder_signer.ready_channel(&self.channel_transaction_parameters);
4475 let signature = match self.get_outbound_funding_created_signature(logger) {
4478 log_error!(logger, "Got bad signatures: {:?}!", e);
4479 self.channel_transaction_parameters.funding_outpoint = None;
4484 let temporary_channel_id = self.channel_id;
4486 // Now that we're past error-generating stuff, update our local state:
4488 self.channel_state = ChannelState::FundingCreated as u32;
4489 self.channel_id = funding_txo.to_channel_id();
4490 self.funding_transaction = Some(funding_transaction);
4492 Ok(msgs::FundingCreated {
4493 temporary_channel_id,
4494 funding_txid: funding_txo.txid,
4495 funding_output_index: funding_txo.index,
4500 /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
4501 /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
4502 /// available for use (have exchanged FundingLocked messages in both directions). Should be used
4503 /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
4504 /// Will only fail if we're not in a state where channel_announcement may be sent (including
4506 /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
4507 /// https://github.com/lightningnetwork/lightning-rfc/issues/468
4509 /// This will only return ChannelError::Ignore upon failure.
4510 pub fn get_channel_announcement(&self, node_id: PublicKey, chain_hash: BlockHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
4511 if !self.config.announced_channel {
4512 return Err(ChannelError::Ignore("Channel is not available for public announcements".to_owned()));
4514 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
4515 return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement until the channel funding has been locked".to_owned()));
4517 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
4518 return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement once the channel is closing".to_owned()));
4521 let were_node_one = node_id.serialize()[..] < self.counterparty_node_id.serialize()[..];
4523 let msg = msgs::UnsignedChannelAnnouncement {
4524 features: ChannelFeatures::known(),
4526 short_channel_id: self.get_short_channel_id().unwrap(),
4527 node_id_1: if were_node_one { node_id } else { self.get_counterparty_node_id() },
4528 node_id_2: if were_node_one { self.get_counterparty_node_id() } else { node_id },
4529 bitcoin_key_1: if were_node_one { self.get_holder_pubkeys().funding_pubkey } else { self.counterparty_funding_pubkey().clone() },
4530 bitcoin_key_2: if were_node_one { self.counterparty_funding_pubkey().clone() } else { self.get_holder_pubkeys().funding_pubkey },
4531 excess_data: Vec::new(),
4534 let sig = self.holder_signer.sign_channel_announcement(&msg, &self.secp_ctx)
4535 .map_err(|_| ChannelError::Ignore("Signer rejected channel_announcement".to_owned()))?;
4540 /// Signs the given channel announcement, returning a ChannelError::Ignore if no keys are
4542 fn sign_channel_announcement(&self, our_node_secret: &SecretKey, our_node_id: PublicKey, msghash: secp256k1::Message, announcement: msgs::UnsignedChannelAnnouncement, our_bitcoin_sig: Signature) -> Result<msgs::ChannelAnnouncement, ChannelError> {
4543 if let Some((their_node_sig, their_bitcoin_sig)) = self.announcement_sigs {
4544 let were_node_one = announcement.node_id_1 == our_node_id;
4546 let our_node_sig = self.secp_ctx.sign(&msghash, our_node_secret);
4547 Ok(msgs::ChannelAnnouncement {
4548 node_signature_1: if were_node_one { our_node_sig } else { their_node_sig },
4549 node_signature_2: if were_node_one { their_node_sig } else { our_node_sig },
4550 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { their_bitcoin_sig },
4551 bitcoin_signature_2: if were_node_one { their_bitcoin_sig } else { our_bitcoin_sig },
4552 contents: announcement,
4555 Err(ChannelError::Ignore("Attempted to sign channel announcement before we'd received announcement_signatures".to_string()))
4559 /// Processes an incoming announcement_signatures message, providing a fully-signed
4560 /// channel_announcement message which we can broadcast and storing our counterparty's
4561 /// signatures for later reconstruction/rebroadcast of the channel_announcement.
4562 pub fn announcement_signatures(&mut self, our_node_secret: &SecretKey, our_node_id: PublicKey, chain_hash: BlockHash, msg: &msgs::AnnouncementSignatures) -> Result<msgs::ChannelAnnouncement, ChannelError> {
4563 let (announcement, our_bitcoin_sig) = self.get_channel_announcement(our_node_id.clone(), chain_hash)?;
4565 let msghash = hash_to_message!(&Sha256d::hash(&announcement.encode()[..])[..]);
4567 if self.secp_ctx.verify(&msghash, &msg.node_signature, &self.get_counterparty_node_id()).is_err() {
4568 return Err(ChannelError::Close(format!(
4569 "Bad announcement_signatures. Failed to verify node_signature. UnsignedChannelAnnouncement used for verification is {:?}. their_node_key is {:?}",
4570 &announcement, self.get_counterparty_node_id())));
4572 if self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, self.counterparty_funding_pubkey()).is_err() {
4573 return Err(ChannelError::Close(format!(
4574 "Bad announcement_signatures. Failed to verify bitcoin_signature. UnsignedChannelAnnouncement used for verification is {:?}. their_bitcoin_key is ({:?})",
4575 &announcement, self.counterparty_funding_pubkey())));
4578 self.announcement_sigs = Some((msg.node_signature, msg.bitcoin_signature));
4580 self.sign_channel_announcement(our_node_secret, our_node_id, msghash, announcement, our_bitcoin_sig)
4583 /// Gets a signed channel_announcement for this channel, if we previously received an
4584 /// announcement_signatures from our counterparty.
4585 pub fn get_signed_channel_announcement(&self, our_node_secret: &SecretKey, our_node_id: PublicKey, chain_hash: BlockHash) -> Option<msgs::ChannelAnnouncement> {
4586 let (announcement, our_bitcoin_sig) = match self.get_channel_announcement(our_node_id.clone(), chain_hash) {
4588 Err(_) => return None,
4590 let msghash = hash_to_message!(&Sha256d::hash(&announcement.encode()[..])[..]);
4591 match self.sign_channel_announcement(our_node_secret, our_node_id, msghash, announcement, our_bitcoin_sig) {
4592 Ok(res) => Some(res),
4597 /// May panic if called on a channel that wasn't immediately-previously
4598 /// self.remove_uncommitted_htlcs_and_mark_paused()'d
4599 pub fn get_channel_reestablish<L: Deref>(&self, logger: &L) -> msgs::ChannelReestablish where L::Target: Logger {
4600 assert_eq!(self.channel_state & ChannelState::PeerDisconnected as u32, ChannelState::PeerDisconnected as u32);
4601 assert_ne!(self.cur_counterparty_commitment_transaction_number, INITIAL_COMMITMENT_NUMBER);
4602 // Prior to static_remotekey, my_current_per_commitment_point was critical to claiming
4603 // current to_remote balances. However, it no longer has any use, and thus is now simply
4604 // set to a dummy (but valid, as required by the spec) public key.
4605 // fuzztarget mode marks a subset of pubkeys as invalid so that we can hit "invalid pubkey"
4606 // branches, but we unwrap it below, so we arbitrarily select a dummy pubkey which is both
4607 // valid, and valid in fuzztarget mode's arbitrary validity criteria:
4608 let mut pk = [2; 33]; pk[1] = 0xff;
4609 let dummy_pubkey = PublicKey::from_slice(&pk).unwrap();
4610 let data_loss_protect = if self.cur_counterparty_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
4611 let remote_last_secret = self.commitment_secrets.get_secret(self.cur_counterparty_commitment_transaction_number + 2).unwrap();
4612 log_trace!(logger, "Enough info to generate a Data Loss Protect with per_commitment_secret {} for channel {}", log_bytes!(remote_last_secret), log_bytes!(self.channel_id()));
4613 OptionalField::Present(DataLossProtect {
4614 your_last_per_commitment_secret: remote_last_secret,
4615 my_current_per_commitment_point: dummy_pubkey
4618 log_info!(logger, "Sending a data_loss_protect with no previous remote per_commitment_secret for channel {}", log_bytes!(self.channel_id()));
4619 OptionalField::Present(DataLossProtect {
4620 your_last_per_commitment_secret: [0;32],
4621 my_current_per_commitment_point: dummy_pubkey,
4624 msgs::ChannelReestablish {
4625 channel_id: self.channel_id(),
4626 // The protocol has two different commitment number concepts - the "commitment
4627 // transaction number", which starts from 0 and counts up, and the "revocation key
4628 // index" which starts at INITIAL_COMMITMENT_NUMBER and counts down. We track
4629 // commitment transaction numbers by the index which will be used to reveal the
4630 // revocation key for that commitment transaction, which means we have to convert them
4631 // to protocol-level commitment numbers here...
4633 // next_local_commitment_number is the next commitment_signed number we expect to
4634 // receive (indicating if they need to resend one that we missed).
4635 next_local_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number,
4636 // We have to set next_remote_commitment_number to the next revoke_and_ack we expect to
4637 // receive, however we track it by the next commitment number for a remote transaction
4638 // (which is one further, as they always revoke previous commitment transaction, not
4639 // the one we send) so we have to decrement by 1. Note that if
4640 // cur_counterparty_commitment_transaction_number is INITIAL_COMMITMENT_NUMBER we will have
4641 // dropped this channel on disconnect as it hasn't yet reached FundingSent so we can't
4643 next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_counterparty_commitment_transaction_number - 1,
4649 // Send stuff to our remote peers:
4651 /// Adds a pending outbound HTLC to this channel, note that you probably want
4652 /// send_htlc_and_commit instead cause you'll want both messages at once.
4654 /// This returns an optional UpdateAddHTLC as we may be in a state where we cannot add HTLCs on
4656 /// * In cases where we're waiting on the remote peer to send us a revoke_and_ack, we
4657 /// wouldn't be able to determine what they actually ACK'ed if we have two sets of updates
4659 /// * In cases where we're marked MonitorUpdateFailed, we cannot commit to a new state as we
4660 /// may not yet have sent the previous commitment update messages and will need to regenerate
4663 /// You MUST call send_commitment prior to calling any other methods on this Channel!
4665 /// If an Err is returned, it's a ChannelError::Ignore!
4666 pub fn send_htlc<L: Deref>(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket, logger: &L) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> where L::Target: Logger {
4667 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
4668 return Err(ChannelError::Ignore("Cannot send HTLC until channel is fully established and we haven't started shutting down".to_owned()));
4670 let channel_total_msat = self.channel_value_satoshis * 1000;
4671 if amount_msat > channel_total_msat {
4672 return Err(ChannelError::Ignore(format!("Cannot send amount {}, because it is more than the total value of the channel {}", amount_msat, channel_total_msat)));
4675 if amount_msat == 0 {
4676 return Err(ChannelError::Ignore("Cannot send 0-msat HTLC".to_owned()));
4679 if amount_msat < self.counterparty_htlc_minimum_msat {
4680 return Err(ChannelError::Ignore(format!("Cannot send less than their minimum HTLC value ({})", self.counterparty_htlc_minimum_msat)));
4683 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) != 0 {
4684 // Note that this should never really happen, if we're !is_live() on receipt of an
4685 // incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
4686 // the user to send directly into a !is_live() channel. However, if we
4687 // disconnected during the time the previous hop was doing the commitment dance we may
4688 // end up getting here after the forwarding delay. In any case, returning an
4689 // IgnoreError will get ChannelManager to do the right thing and fail backwards now.
4690 return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected from channel counterparty".to_owned()));
4693 let inbound_stats = self.get_inbound_pending_htlc_stats(None);
4694 let outbound_stats = self.get_outbound_pending_htlc_stats(None);
4695 if outbound_stats.pending_htlcs + 1 > self.counterparty_max_accepted_htlcs as u32 {
4696 return Err(ChannelError::Ignore(format!("Cannot push more than their max accepted HTLCs ({})", self.counterparty_max_accepted_htlcs)));
4698 // Check their_max_htlc_value_in_flight_msat
4699 if outbound_stats.pending_htlcs_value_msat + amount_msat > self.counterparty_max_htlc_value_in_flight_msat {
4700 return Err(ChannelError::Ignore(format!("Cannot send value that would put us over the max HTLC value in flight our peer will accept ({})", self.counterparty_max_htlc_value_in_flight_msat)));
4703 let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number)?;
4704 let commitment_stats = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, true, logger);
4705 if !self.is_outbound() {
4706 // Check that we won't violate the remote channel reserve by adding this HTLC.
4707 let htlc_candidate = HTLCCandidate::new(amount_msat, HTLCInitiator::LocalOffered);
4708 let counterparty_commit_tx_fee_msat = self.next_remote_commit_tx_fee_msat(htlc_candidate, None);
4709 let holder_selected_chan_reserve_msat = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) * 1000;
4710 if commitment_stats.remote_balance_msat < counterparty_commit_tx_fee_msat + holder_selected_chan_reserve_msat {
4711 return Err(ChannelError::Ignore("Cannot send value that would put counterparty balance under holder-announced channel reserve value".to_owned()));
4715 let exposure_dust_limit_success_sats = (self.get_dust_buffer_feerate(None) as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
4716 if amount_msat / 1000 < exposure_dust_limit_success_sats {
4717 let on_counterparty_dust_htlc_exposure_msat = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat + amount_msat;
4718 if on_counterparty_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
4719 return Err(ChannelError::Ignore(format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx",
4720 on_counterparty_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat())));
4724 let exposure_dust_limit_timeout_sats = (self.get_dust_buffer_feerate(None) as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
4725 if amount_msat / 1000 < exposure_dust_limit_timeout_sats {
4726 let on_holder_dust_htlc_exposure_msat = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat + amount_msat;
4727 if on_holder_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
4728 return Err(ChannelError::Ignore(format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx",
4729 on_holder_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat())));
4733 let holder_balance_msat = commitment_stats.local_balance_msat - outbound_stats.holding_cell_msat;
4734 if holder_balance_msat < amount_msat {
4735 return Err(ChannelError::Ignore(format!("Cannot send value that would overdraw remaining funds. Amount: {}, pending value to self {}", amount_msat, holder_balance_msat)));
4738 // `2 *` and extra HTLC are for the fee spike buffer.
4739 let commit_tx_fee_msat = if self.is_outbound() {
4740 let htlc_candidate = HTLCCandidate::new(amount_msat, HTLCInitiator::LocalOffered);
4741 FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE * self.next_local_commit_tx_fee_msat(htlc_candidate, Some(()))
4743 if holder_balance_msat - amount_msat < commit_tx_fee_msat {
4744 return Err(ChannelError::Ignore(format!("Cannot send value that would not leave enough to pay for fees. Pending value to self: {}. local_commit_tx_fee {}", holder_balance_msat, commit_tx_fee_msat)));
4747 // Check self.counterparty_selected_channel_reserve_satoshis (the amount we must keep as
4748 // reserve for the remote to have something to claim if we misbehave)
4749 let chan_reserve_msat = self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000;
4750 if holder_balance_msat - amount_msat - commit_tx_fee_msat < chan_reserve_msat {
4751 return Err(ChannelError::Ignore(format!("Cannot send value that would put our balance under counterparty-announced channel reserve value ({})", chan_reserve_msat)));
4754 // Now update local state:
4755 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
4756 self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
4761 onion_routing_packet,
4766 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
4767 htlc_id: self.next_holder_htlc_id,
4769 payment_hash: payment_hash.clone(),
4771 state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
4775 let res = msgs::UpdateAddHTLC {
4776 channel_id: self.channel_id,
4777 htlc_id: self.next_holder_htlc_id,
4781 onion_routing_packet,
4783 self.next_holder_htlc_id += 1;
4788 /// Creates a signed commitment transaction to send to the remote peer.
4789 /// Always returns a ChannelError::Close if an immediately-preceding (read: the
4790 /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
4791 /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
4792 pub fn send_commitment<L: Deref>(&mut self, logger: &L) -> Result<(msgs::CommitmentSigned, ChannelMonitorUpdate), ChannelError> where L::Target: Logger {
4793 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
4794 panic!("Cannot create commitment tx until channel is fully established");
4796 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
4797 panic!("Cannot create commitment tx until remote revokes their previous commitment");
4799 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
4800 panic!("Cannot create commitment tx while disconnected, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
4802 if (self.channel_state & (ChannelState::MonitorUpdateFailed as u32)) == (ChannelState::MonitorUpdateFailed as u32) {
4803 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");
4805 let mut have_updates = self.is_outbound() && self.pending_update_fee.is_some();
4806 for htlc in self.pending_outbound_htlcs.iter() {
4807 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
4808 have_updates = true;
4810 if have_updates { break; }
4812 for htlc in self.pending_inbound_htlcs.iter() {
4813 if let InboundHTLCState::LocalRemoved(_) = htlc.state {
4814 have_updates = true;
4816 if have_updates { break; }
4819 panic!("Cannot create commitment tx until we have some updates to send");
4821 self.send_commitment_no_status_check(logger)
4823 /// Only fails in case of bad keys
4824 fn send_commitment_no_status_check<L: Deref>(&mut self, logger: &L) -> Result<(msgs::CommitmentSigned, ChannelMonitorUpdate), ChannelError> where L::Target: Logger {
4825 log_trace!(logger, "Updating HTLC state for a newly-sent commitment_signed...");
4826 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
4827 // fail to generate this, we still are at least at a position where upgrading their status
4829 for htlc in self.pending_inbound_htlcs.iter_mut() {
4830 let new_state = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref forward_info) = &htlc.state {
4831 Some(InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info.clone()))
4833 if let Some(state) = new_state {
4834 log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to AwaitingAnnouncedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
4838 for htlc in self.pending_outbound_htlcs.iter_mut() {
4839 if let Some(fail_reason) = if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut fail_reason) = &mut htlc.state {
4840 Some(fail_reason.take())
4842 log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
4843 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(fail_reason);
4846 if let Some((feerate, update_state)) = self.pending_update_fee {
4847 if update_state == FeeUpdateState::AwaitingRemoteRevokeToAnnounce {
4848 debug_assert!(!self.is_outbound());
4849 log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce fee update {} to Committed", feerate);
4850 self.feerate_per_kw = feerate;
4851 self.pending_update_fee = None;
4854 self.resend_order = RAACommitmentOrder::RevokeAndACKFirst;
4856 let (res, counterparty_commitment_txid, htlcs) = match self.send_commitment_no_state_update(logger) {
4857 Ok((res, (counterparty_commitment_tx, mut htlcs))) => {
4858 // Update state now that we've passed all the can-fail calls...
4859 let htlcs_no_ref: Vec<(HTLCOutputInCommitment, Option<Box<HTLCSource>>)> =
4860 htlcs.drain(..).map(|(htlc, htlc_source)| (htlc, htlc_source.map(|source_ref| Box::new(source_ref.clone())))).collect();
4861 (res, counterparty_commitment_tx, htlcs_no_ref)
4863 Err(e) => return Err(e),
4866 self.latest_monitor_update_id += 1;
4867 let monitor_update = ChannelMonitorUpdate {
4868 update_id: self.latest_monitor_update_id,
4869 updates: vec![ChannelMonitorUpdateStep::LatestCounterpartyCommitmentTXInfo {
4870 commitment_txid: counterparty_commitment_txid,
4871 htlc_outputs: htlcs.clone(),
4872 commitment_number: self.cur_counterparty_commitment_transaction_number,
4873 their_revocation_point: self.counterparty_cur_commitment_point.unwrap()
4876 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
4877 Ok((res, monitor_update))
4880 /// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
4881 /// when we shouldn't change HTLC/channel state.
4882 fn send_commitment_no_state_update<L: Deref>(&self, logger: &L) -> Result<(msgs::CommitmentSigned, (Txid, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>)), ChannelError> where L::Target: Logger {
4883 let counterparty_keys = self.build_remote_transaction_keys()?;
4884 let commitment_stats = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, true, logger);
4885 let counterparty_commitment_txid = commitment_stats.tx.trust().txid();
4886 let (signature, htlc_signatures);
4888 #[cfg(any(test, feature = "fuzztarget"))]
4890 if !self.is_outbound() {
4891 let projected_commit_tx_info = self.next_remote_commitment_tx_fee_info_cached.lock().unwrap().take();
4892 *self.next_local_commitment_tx_fee_info_cached.lock().unwrap() = None;
4893 if let Some(info) = projected_commit_tx_info {
4894 let total_pending_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len();
4895 if info.total_pending_htlcs == total_pending_htlcs
4896 && info.next_holder_htlc_id == self.next_holder_htlc_id
4897 && info.next_counterparty_htlc_id == self.next_counterparty_htlc_id
4898 && info.feerate == self.feerate_per_kw {
4899 let actual_fee = Self::commit_tx_fee_msat(self.feerate_per_kw, commitment_stats.num_nondust_htlcs);
4900 assert_eq!(actual_fee, info.fee);
4907 let mut htlcs = Vec::with_capacity(commitment_stats.htlcs_included.len());
4908 for &(ref htlc, _) in commitment_stats.htlcs_included.iter() {
4912 let res = self.holder_signer.sign_counterparty_commitment(&commitment_stats.tx, &self.secp_ctx)
4913 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed".to_owned()))?;
4915 htlc_signatures = res.1;
4917 log_trace!(logger, "Signed remote commitment tx {} (txid {}) with redeemscript {} -> {} in channel {}",
4918 encode::serialize_hex(&commitment_stats.tx.trust().built_transaction().transaction),
4919 &counterparty_commitment_txid, encode::serialize_hex(&self.get_funding_redeemscript()),
4920 log_bytes!(signature.serialize_compact()[..]), log_bytes!(self.channel_id()));
4922 for (ref htlc_sig, ref htlc) in htlc_signatures.iter().zip(htlcs) {
4923 log_trace!(logger, "Signed remote HTLC tx {} with redeemscript {} with pubkey {} -> {} in channel {}",
4924 encode::serialize_hex(&chan_utils::build_htlc_transaction(&counterparty_commitment_txid, commitment_stats.feerate_per_kw, self.get_holder_selected_contest_delay(), htlc, &counterparty_keys.broadcaster_delayed_payment_key, &counterparty_keys.revocation_key)),
4925 encode::serialize_hex(&chan_utils::get_htlc_redeemscript(&htlc, &counterparty_keys)),
4926 log_bytes!(counterparty_keys.broadcaster_htlc_key.serialize()),
4927 log_bytes!(htlc_sig.serialize_compact()[..]), log_bytes!(self.channel_id()));
4931 Ok((msgs::CommitmentSigned {
4932 channel_id: self.channel_id,
4935 }, (counterparty_commitment_txid, commitment_stats.htlcs_included)))
4938 /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
4939 /// to send to the remote peer in one go.
4940 /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
4942 pub fn send_htlc_and_commit<L: Deref>(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket, logger: &L) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitorUpdate)>, ChannelError> where L::Target: Logger {
4943 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet, logger)? {
4944 Some(update_add_htlc) => {
4945 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check(logger)?;
4946 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
4952 /// Get forwarding information for the counterparty.
4953 pub fn counterparty_forwarding_info(&self) -> Option<CounterpartyForwardingInfo> {
4954 self.counterparty_forwarding_info.clone()
4957 pub fn channel_update(&mut self, msg: &msgs::ChannelUpdate) -> Result<(), ChannelError> {
4958 if msg.contents.htlc_minimum_msat >= self.channel_value_satoshis * 1000 {
4959 return Err(ChannelError::Close("Minimum htlc value is greater than channel value".to_string()));
4961 self.counterparty_forwarding_info = Some(CounterpartyForwardingInfo {
4962 fee_base_msat: msg.contents.fee_base_msat,
4963 fee_proportional_millionths: msg.contents.fee_proportional_millionths,
4964 cltv_expiry_delta: msg.contents.cltv_expiry_delta
4970 /// Begins the shutdown process, getting a message for the remote peer and returning all
4971 /// holding cell HTLCs for payment failure.
4972 pub fn get_shutdown<K: Deref>(&mut self, keys_provider: &K, their_features: &InitFeatures, target_feerate_sats_per_kw: Option<u32>)
4973 -> Result<(msgs::Shutdown, Option<ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), APIError>
4974 where K::Target: KeysInterface<Signer = Signer> {
4975 for htlc in self.pending_outbound_htlcs.iter() {
4976 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
4977 return Err(APIError::APIMisuseError{err: "Cannot begin shutdown with pending HTLCs. Process pending events first".to_owned()});
4980 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
4981 if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
4982 return Err(APIError::APIMisuseError{err: "Shutdown already in progress".to_owned()});
4984 else if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
4985 return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote".to_owned()});
4988 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
4989 if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) != 0 {
4990 return Err(APIError::ChannelUnavailable{err: "Cannot begin shutdown while peer is disconnected or we're waiting on a monitor update, maybe force-close instead?".to_owned()});
4993 let update_shutdown_script = match self.shutdown_scriptpubkey {
4996 let shutdown_scriptpubkey = keys_provider.get_shutdown_scriptpubkey();
4997 if !shutdown_scriptpubkey.is_compatible(their_features) {
4998 return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
5000 self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
5005 // From here on out, we may not fail!
5006 self.target_closing_feerate_sats_per_kw = target_feerate_sats_per_kw;
5007 if self.channel_state < ChannelState::FundingSent as u32 {
5008 self.channel_state = ChannelState::ShutdownComplete as u32;
5010 self.channel_state |= ChannelState::LocalShutdownSent as u32;
5012 self.update_time_counter += 1;
5014 let monitor_update = if update_shutdown_script {
5015 self.latest_monitor_update_id += 1;
5016 Some(ChannelMonitorUpdate {
5017 update_id: self.latest_monitor_update_id,
5018 updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
5019 scriptpubkey: self.get_closing_scriptpubkey(),
5023 let shutdown = msgs::Shutdown {
5024 channel_id: self.channel_id,
5025 scriptpubkey: self.get_closing_scriptpubkey(),
5028 // Go ahead and drop holding cell updates as we'd rather fail payments than wait to send
5029 // our shutdown until we've committed all of the pending changes.
5030 self.holding_cell_update_fee = None;
5031 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
5032 self.holding_cell_htlc_updates.retain(|htlc_update| {
5034 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
5035 dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
5042 Ok((shutdown, monitor_update, dropped_outbound_htlcs))
5045 /// Gets the latest commitment transaction and any dependent transactions for relay (forcing
5046 /// shutdown of this channel - no more calls into this Channel may be made afterwards except
5047 /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
5048 /// Also returns the list of payment_hashes for channels which we can safely fail backwards
5049 /// immediately (others we will have to allow to time out).
5050 pub fn force_shutdown(&mut self, should_broadcast: bool) -> (Option<(OutPoint, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>) {
5051 // Note that we MUST only generate a monitor update that indicates force-closure - we're
5052 // called during initialization prior to the chain_monitor in the encompassing ChannelManager
5053 // being fully configured in some cases. Thus, its likely any monitor events we generate will
5054 // be delayed in being processed! See the docs for `ChannelManagerReadArgs` for more.
5055 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
5057 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
5058 // return them to fail the payment.
5059 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
5060 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
5062 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
5063 dropped_outbound_htlcs.push((source, payment_hash));
5068 let monitor_update = if let Some(funding_txo) = self.get_funding_txo() {
5069 // If we haven't yet exchanged funding signatures (ie channel_state < FundingSent),
5070 // returning a channel monitor update here would imply a channel monitor update before
5071 // we even registered the channel monitor to begin with, which is invalid.
5072 // Thus, if we aren't actually at a point where we could conceivably broadcast the
5073 // funding transaction, don't return a funding txo (which prevents providing the
5074 // monitor update to the user, even if we return one).
5075 // See test_duplicate_chan_id and test_pre_lockin_no_chan_closed_update for more.
5076 if self.channel_state & (ChannelState::FundingSent as u32 | ChannelState::ChannelFunded as u32 | ChannelState::ShutdownComplete as u32) != 0 {
5077 self.latest_monitor_update_id += 1;
5078 Some((funding_txo, ChannelMonitorUpdate {
5079 update_id: self.latest_monitor_update_id,
5080 updates: vec![ChannelMonitorUpdateStep::ChannelForceClosed { should_broadcast }],
5085 self.channel_state = ChannelState::ShutdownComplete as u32;
5086 self.update_time_counter += 1;
5087 (monitor_update, dropped_outbound_htlcs)
5091 const SERIALIZATION_VERSION: u8 = 2;
5092 const MIN_SERIALIZATION_VERSION: u8 = 1;
5094 impl_writeable_tlv_based_enum!(InboundHTLCRemovalReason,;
5100 impl Writeable for ChannelUpdateStatus {
5101 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
5102 // We only care about writing out the current state as it was announced, ie only either
5103 // Enabled or Disabled. In the case of DisabledStaged, we most recently announced the
5104 // channel as enabled, so we write 0. For EnabledStaged, we similarly write a 1.
5106 ChannelUpdateStatus::Enabled => 0u8.write(writer)?,
5107 ChannelUpdateStatus::DisabledStaged => 0u8.write(writer)?,
5108 ChannelUpdateStatus::EnabledStaged => 1u8.write(writer)?,
5109 ChannelUpdateStatus::Disabled => 1u8.write(writer)?,
5115 impl Readable for ChannelUpdateStatus {
5116 fn read<R: io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
5117 Ok(match <u8 as Readable>::read(reader)? {
5118 0 => ChannelUpdateStatus::Enabled,
5119 1 => ChannelUpdateStatus::Disabled,
5120 _ => return Err(DecodeError::InvalidValue),
5125 impl<Signer: Sign> Writeable for Channel<Signer> {
5126 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
5127 // Note that we write out as if remove_uncommitted_htlcs_and_mark_paused had just been
5130 write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
5132 self.user_id.write(writer)?;
5134 // Write out the old serialization for the config object. This is read by version-1
5135 // deserializers, but we will read the version in the TLV at the end instead.
5136 self.config.forwarding_fee_proportional_millionths.write(writer)?;
5137 self.config.cltv_expiry_delta.write(writer)?;
5138 self.config.announced_channel.write(writer)?;
5139 self.config.commit_upfront_shutdown_pubkey.write(writer)?;
5141 self.channel_id.write(writer)?;
5142 (self.channel_state | ChannelState::PeerDisconnected as u32).write(writer)?;
5143 self.channel_value_satoshis.write(writer)?;
5145 self.latest_monitor_update_id.write(writer)?;
5147 let mut key_data = VecWriter(Vec::new());
5148 self.holder_signer.write(&mut key_data)?;
5149 assert!(key_data.0.len() < core::usize::MAX);
5150 assert!(key_data.0.len() < core::u32::MAX as usize);
5151 (key_data.0.len() as u32).write(writer)?;
5152 writer.write_all(&key_data.0[..])?;
5154 // Write out the old serialization for shutdown_pubkey for backwards compatibility, if
5155 // deserialized from that format.
5156 match self.shutdown_scriptpubkey.as_ref().and_then(|script| script.as_legacy_pubkey()) {
5157 Some(shutdown_pubkey) => shutdown_pubkey.write(writer)?,
5158 None => [0u8; PUBLIC_KEY_SIZE].write(writer)?,
5160 self.destination_script.write(writer)?;
5162 self.cur_holder_commitment_transaction_number.write(writer)?;
5163 self.cur_counterparty_commitment_transaction_number.write(writer)?;
5164 self.value_to_self_msat.write(writer)?;
5166 let mut dropped_inbound_htlcs = 0;
5167 for htlc in self.pending_inbound_htlcs.iter() {
5168 if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
5169 dropped_inbound_htlcs += 1;
5172 (self.pending_inbound_htlcs.len() as u64 - dropped_inbound_htlcs).write(writer)?;
5173 for htlc in self.pending_inbound_htlcs.iter() {
5174 if let &InboundHTLCState::RemoteAnnounced(_) = &htlc.state {
5177 htlc.htlc_id.write(writer)?;
5178 htlc.amount_msat.write(writer)?;
5179 htlc.cltv_expiry.write(writer)?;
5180 htlc.payment_hash.write(writer)?;
5182 &InboundHTLCState::RemoteAnnounced(_) => unreachable!(),
5183 &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref htlc_state) => {
5185 htlc_state.write(writer)?;
5187 &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(ref htlc_state) => {
5189 htlc_state.write(writer)?;
5191 &InboundHTLCState::Committed => {
5194 &InboundHTLCState::LocalRemoved(ref removal_reason) => {
5196 removal_reason.write(writer)?;
5201 (self.pending_outbound_htlcs.len() as u64).write(writer)?;
5202 for htlc in self.pending_outbound_htlcs.iter() {
5203 htlc.htlc_id.write(writer)?;
5204 htlc.amount_msat.write(writer)?;
5205 htlc.cltv_expiry.write(writer)?;
5206 htlc.payment_hash.write(writer)?;
5207 htlc.source.write(writer)?;
5209 &OutboundHTLCState::LocalAnnounced(ref onion_packet) => {
5211 onion_packet.write(writer)?;
5213 &OutboundHTLCState::Committed => {
5216 &OutboundHTLCState::RemoteRemoved(_) => {
5217 // Treat this as a Committed because we haven't received the CS - they'll
5218 // resend the claim/fail on reconnect as we all (hopefully) the missing CS.
5221 &OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref fail_reason) => {
5223 fail_reason.write(writer)?;
5225 &OutboundHTLCState::AwaitingRemovedRemoteRevoke(ref fail_reason) => {
5227 fail_reason.write(writer)?;
5232 (self.holding_cell_htlc_updates.len() as u64).write(writer)?;
5233 for update in self.holding_cell_htlc_updates.iter() {
5235 &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet } => {
5237 amount_msat.write(writer)?;
5238 cltv_expiry.write(writer)?;
5239 payment_hash.write(writer)?;
5240 source.write(writer)?;
5241 onion_routing_packet.write(writer)?;
5243 &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, ref htlc_id } => {
5245 payment_preimage.write(writer)?;
5246 htlc_id.write(writer)?;
5248 &HTLCUpdateAwaitingACK::FailHTLC { ref htlc_id, ref err_packet } => {
5250 htlc_id.write(writer)?;
5251 err_packet.write(writer)?;
5256 match self.resend_order {
5257 RAACommitmentOrder::CommitmentFirst => 0u8.write(writer)?,
5258 RAACommitmentOrder::RevokeAndACKFirst => 1u8.write(writer)?,
5261 self.monitor_pending_funding_locked.write(writer)?;
5262 self.monitor_pending_revoke_and_ack.write(writer)?;
5263 self.monitor_pending_commitment_signed.write(writer)?;
5265 (self.monitor_pending_forwards.len() as u64).write(writer)?;
5266 for &(ref pending_forward, ref htlc_id) in self.monitor_pending_forwards.iter() {
5267 pending_forward.write(writer)?;
5268 htlc_id.write(writer)?;
5271 (self.monitor_pending_failures.len() as u64).write(writer)?;
5272 for &(ref htlc_source, ref payment_hash, ref fail_reason) in self.monitor_pending_failures.iter() {
5273 htlc_source.write(writer)?;
5274 payment_hash.write(writer)?;
5275 fail_reason.write(writer)?;
5278 if self.is_outbound() {
5279 self.pending_update_fee.map(|(a, _)| a).write(writer)?;
5280 } else if let Some((feerate, FeeUpdateState::AwaitingRemoteRevokeToAnnounce)) = self.pending_update_fee {
5281 Some(feerate).write(writer)?;
5283 // As for inbound HTLCs, if the update was only announced and never committed in a
5284 // commitment_signed, drop it.
5285 None::<u32>.write(writer)?;
5287 self.holding_cell_update_fee.write(writer)?;
5289 self.next_holder_htlc_id.write(writer)?;
5290 (self.next_counterparty_htlc_id - dropped_inbound_htlcs).write(writer)?;
5291 self.update_time_counter.write(writer)?;
5292 self.feerate_per_kw.write(writer)?;
5294 // Versions prior to 0.0.100 expected to read the fields of `last_sent_closing_fee` here,
5295 // however we are supposed to restart shutdown fee negotiation on reconnect (and wipe
5296 // `last_send_closing_fee` in `remove_uncommitted_htlcs_and_mark_paused`) so we should never
5297 // consider the stale state on reload.
5300 self.funding_tx_confirmed_in.write(writer)?;
5301 self.funding_tx_confirmation_height.write(writer)?;
5302 self.short_channel_id.write(writer)?;
5304 self.counterparty_dust_limit_satoshis.write(writer)?;
5305 self.holder_dust_limit_satoshis.write(writer)?;
5306 self.counterparty_max_htlc_value_in_flight_msat.write(writer)?;
5308 // Note that this field is ignored by 0.0.99+ as the TLV Optional variant is used instead.
5309 self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0).write(writer)?;
5311 self.counterparty_htlc_minimum_msat.write(writer)?;
5312 self.holder_htlc_minimum_msat.write(writer)?;
5313 self.counterparty_max_accepted_htlcs.write(writer)?;
5315 // Note that this field is ignored by 0.0.99+ as the TLV Optional variant is used instead.
5316 self.minimum_depth.unwrap_or(0).write(writer)?;
5318 match &self.counterparty_forwarding_info {
5321 info.fee_base_msat.write(writer)?;
5322 info.fee_proportional_millionths.write(writer)?;
5323 info.cltv_expiry_delta.write(writer)?;
5325 None => 0u8.write(writer)?
5328 self.channel_transaction_parameters.write(writer)?;
5329 self.funding_transaction.write(writer)?;
5331 self.counterparty_cur_commitment_point.write(writer)?;
5332 self.counterparty_prev_commitment_point.write(writer)?;
5333 self.counterparty_node_id.write(writer)?;
5335 self.counterparty_shutdown_scriptpubkey.write(writer)?;
5337 self.commitment_secrets.write(writer)?;
5339 self.channel_update_status.write(writer)?;
5341 #[cfg(any(test, feature = "fuzztarget"))]
5342 (self.historical_inbound_htlc_fulfills.len() as u64).write(writer)?;
5343 #[cfg(any(test, feature = "fuzztarget"))]
5344 for htlc in self.historical_inbound_htlc_fulfills.iter() {
5345 htlc.write(writer)?;
5348 // If the channel type is something other than only-static-remote-key, then we need to have
5349 // older clients fail to deserialize this channel at all. If the type is
5350 // only-static-remote-key, we simply consider it "default" and don't write the channel type
5352 let chan_type = if self.channel_type != ChannelTypeFeatures::only_static_remote_key() {
5353 Some(&self.channel_type) } else { None };
5355 write_tlv_fields!(writer, {
5356 (0, self.announcement_sigs, option),
5357 // minimum_depth and counterparty_selected_channel_reserve_satoshis used to have a
5358 // default value instead of being Option<>al. Thus, to maintain compatibility we write
5359 // them twice, once with their original default values above, and once as an option
5360 // here. On the read side, old versions will simply ignore the odd-type entries here,
5361 // and new versions map the default values to None and allow the TLV entries here to
5363 (1, self.minimum_depth, option),
5364 (2, chan_type, option),
5365 (3, self.counterparty_selected_channel_reserve_satoshis, option),
5366 (5, self.config, required),
5367 (7, self.shutdown_scriptpubkey, option),
5368 (9, self.target_closing_feerate_sats_per_kw, option),
5369 (11, self.monitor_pending_finalized_fulfills, vec_type),
5370 (13, self.channel_creation_height, required),
5377 const MAX_ALLOC_SIZE: usize = 64*1024;
5378 impl<'a, Signer: Sign, K: Deref> ReadableArgs<(&'a K, u32)> for Channel<Signer>
5379 where K::Target: KeysInterface<Signer = Signer> {
5380 fn read<R : io::Read>(reader: &mut R, args: (&'a K, u32)) -> Result<Self, DecodeError> {
5381 let (keys_source, serialized_height) = args;
5382 let ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
5384 let user_id = Readable::read(reader)?;
5386 let mut config = Some(ChannelConfig::default());
5388 // Read the old serialization of the ChannelConfig from version 0.0.98.
5389 config.as_mut().unwrap().forwarding_fee_proportional_millionths = Readable::read(reader)?;
5390 config.as_mut().unwrap().cltv_expiry_delta = Readable::read(reader)?;
5391 config.as_mut().unwrap().announced_channel = Readable::read(reader)?;
5392 config.as_mut().unwrap().commit_upfront_shutdown_pubkey = Readable::read(reader)?;
5394 // Read the 8 bytes of backwards-compatibility ChannelConfig data.
5395 let mut _val: u64 = Readable::read(reader)?;
5398 let channel_id = Readable::read(reader)?;
5399 let channel_state = Readable::read(reader)?;
5400 let channel_value_satoshis = Readable::read(reader)?;
5402 let latest_monitor_update_id = Readable::read(reader)?;
5404 let keys_len: u32 = Readable::read(reader)?;
5405 let mut keys_data = Vec::with_capacity(cmp::min(keys_len as usize, MAX_ALLOC_SIZE));
5406 while keys_data.len() != keys_len as usize {
5407 // Read 1KB at a time to avoid accidentally allocating 4GB on corrupted channel keys
5408 let mut data = [0; 1024];
5409 let read_slice = &mut data[0..cmp::min(1024, keys_len as usize - keys_data.len())];
5410 reader.read_exact(read_slice)?;
5411 keys_data.extend_from_slice(read_slice);
5413 let holder_signer = keys_source.read_chan_signer(&keys_data)?;
5415 // Read the old serialization for shutdown_pubkey, preferring the TLV field later if set.
5416 let mut shutdown_scriptpubkey = match <PublicKey as Readable>::read(reader) {
5417 Ok(pubkey) => Some(ShutdownScript::new_p2wpkh_from_pubkey(pubkey)),
5420 let destination_script = Readable::read(reader)?;
5422 let cur_holder_commitment_transaction_number = Readable::read(reader)?;
5423 let cur_counterparty_commitment_transaction_number = Readable::read(reader)?;
5424 let value_to_self_msat = Readable::read(reader)?;
5426 let pending_inbound_htlc_count: u64 = Readable::read(reader)?;
5427 let mut pending_inbound_htlcs = Vec::with_capacity(cmp::min(pending_inbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
5428 for _ in 0..pending_inbound_htlc_count {
5429 pending_inbound_htlcs.push(InboundHTLCOutput {
5430 htlc_id: Readable::read(reader)?,
5431 amount_msat: Readable::read(reader)?,
5432 cltv_expiry: Readable::read(reader)?,
5433 payment_hash: Readable::read(reader)?,
5434 state: match <u8 as Readable>::read(reader)? {
5435 1 => InboundHTLCState::AwaitingRemoteRevokeToAnnounce(Readable::read(reader)?),
5436 2 => InboundHTLCState::AwaitingAnnouncedRemoteRevoke(Readable::read(reader)?),
5437 3 => InboundHTLCState::Committed,
5438 4 => InboundHTLCState::LocalRemoved(Readable::read(reader)?),
5439 _ => return Err(DecodeError::InvalidValue),
5444 let pending_outbound_htlc_count: u64 = Readable::read(reader)?;
5445 let mut pending_outbound_htlcs = Vec::with_capacity(cmp::min(pending_outbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
5446 for _ in 0..pending_outbound_htlc_count {
5447 pending_outbound_htlcs.push(OutboundHTLCOutput {
5448 htlc_id: Readable::read(reader)?,
5449 amount_msat: Readable::read(reader)?,
5450 cltv_expiry: Readable::read(reader)?,
5451 payment_hash: Readable::read(reader)?,
5452 source: Readable::read(reader)?,
5453 state: match <u8 as Readable>::read(reader)? {
5454 0 => OutboundHTLCState::LocalAnnounced(Box::new(Readable::read(reader)?)),
5455 1 => OutboundHTLCState::Committed,
5456 2 => OutboundHTLCState::RemoteRemoved(Readable::read(reader)?),
5457 3 => OutboundHTLCState::AwaitingRemoteRevokeToRemove(Readable::read(reader)?),
5458 4 => OutboundHTLCState::AwaitingRemovedRemoteRevoke(Readable::read(reader)?),
5459 _ => return Err(DecodeError::InvalidValue),
5464 let holding_cell_htlc_update_count: u64 = Readable::read(reader)?;
5465 let mut holding_cell_htlc_updates = Vec::with_capacity(cmp::min(holding_cell_htlc_update_count as usize, OUR_MAX_HTLCS as usize*2));
5466 for _ in 0..holding_cell_htlc_update_count {
5467 holding_cell_htlc_updates.push(match <u8 as Readable>::read(reader)? {
5468 0 => HTLCUpdateAwaitingACK::AddHTLC {
5469 amount_msat: Readable::read(reader)?,
5470 cltv_expiry: Readable::read(reader)?,
5471 payment_hash: Readable::read(reader)?,
5472 source: Readable::read(reader)?,
5473 onion_routing_packet: Readable::read(reader)?,
5475 1 => HTLCUpdateAwaitingACK::ClaimHTLC {
5476 payment_preimage: Readable::read(reader)?,
5477 htlc_id: Readable::read(reader)?,
5479 2 => HTLCUpdateAwaitingACK::FailHTLC {
5480 htlc_id: Readable::read(reader)?,
5481 err_packet: Readable::read(reader)?,
5483 _ => return Err(DecodeError::InvalidValue),
5487 let resend_order = match <u8 as Readable>::read(reader)? {
5488 0 => RAACommitmentOrder::CommitmentFirst,
5489 1 => RAACommitmentOrder::RevokeAndACKFirst,
5490 _ => return Err(DecodeError::InvalidValue),
5493 let monitor_pending_funding_locked = Readable::read(reader)?;
5494 let monitor_pending_revoke_and_ack = Readable::read(reader)?;
5495 let monitor_pending_commitment_signed = Readable::read(reader)?;
5497 let monitor_pending_forwards_count: u64 = Readable::read(reader)?;
5498 let mut monitor_pending_forwards = Vec::with_capacity(cmp::min(monitor_pending_forwards_count as usize, OUR_MAX_HTLCS as usize));
5499 for _ in 0..monitor_pending_forwards_count {
5500 monitor_pending_forwards.push((Readable::read(reader)?, Readable::read(reader)?));
5503 let monitor_pending_failures_count: u64 = Readable::read(reader)?;
5504 let mut monitor_pending_failures = Vec::with_capacity(cmp::min(monitor_pending_failures_count as usize, OUR_MAX_HTLCS as usize));
5505 for _ in 0..monitor_pending_failures_count {
5506 monitor_pending_failures.push((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?));
5509 let pending_update_fee_value: Option<u32> = Readable::read(reader)?;
5511 let holding_cell_update_fee = Readable::read(reader)?;
5513 let next_holder_htlc_id = Readable::read(reader)?;
5514 let next_counterparty_htlc_id = Readable::read(reader)?;
5515 let update_time_counter = Readable::read(reader)?;
5516 let feerate_per_kw = Readable::read(reader)?;
5518 // Versions prior to 0.0.100 expected to read the fields of `last_sent_closing_fee` here,
5519 // however we are supposed to restart shutdown fee negotiation on reconnect (and wipe
5520 // `last_send_closing_fee` in `remove_uncommitted_htlcs_and_mark_paused`) so we should never
5521 // consider the stale state on reload.
5522 match <u8 as Readable>::read(reader)? {
5525 let _: u32 = Readable::read(reader)?;
5526 let _: u64 = Readable::read(reader)?;
5527 let _: Signature = Readable::read(reader)?;
5529 _ => return Err(DecodeError::InvalidValue),
5532 let funding_tx_confirmed_in = Readable::read(reader)?;
5533 let funding_tx_confirmation_height = Readable::read(reader)?;
5534 let short_channel_id = Readable::read(reader)?;
5536 let counterparty_dust_limit_satoshis = Readable::read(reader)?;
5537 let holder_dust_limit_satoshis = Readable::read(reader)?;
5538 let counterparty_max_htlc_value_in_flight_msat = Readable::read(reader)?;
5539 let mut counterparty_selected_channel_reserve_satoshis = None;
5541 // Read the old serialization from version 0.0.98.
5542 counterparty_selected_channel_reserve_satoshis = Some(Readable::read(reader)?);
5544 // Read the 8 bytes of backwards-compatibility data.
5545 let _dummy: u64 = Readable::read(reader)?;
5547 let counterparty_htlc_minimum_msat = Readable::read(reader)?;
5548 let holder_htlc_minimum_msat = Readable::read(reader)?;
5549 let counterparty_max_accepted_htlcs = Readable::read(reader)?;
5551 let mut minimum_depth = None;
5553 // Read the old serialization from version 0.0.98.
5554 minimum_depth = Some(Readable::read(reader)?);
5556 // Read the 4 bytes of backwards-compatibility data.
5557 let _dummy: u32 = Readable::read(reader)?;
5560 let counterparty_forwarding_info = match <u8 as Readable>::read(reader)? {
5562 1 => Some(CounterpartyForwardingInfo {
5563 fee_base_msat: Readable::read(reader)?,
5564 fee_proportional_millionths: Readable::read(reader)?,
5565 cltv_expiry_delta: Readable::read(reader)?,
5567 _ => return Err(DecodeError::InvalidValue),
5570 let channel_parameters: ChannelTransactionParameters = Readable::read(reader)?;
5571 let funding_transaction = Readable::read(reader)?;
5573 let counterparty_cur_commitment_point = Readable::read(reader)?;
5575 let counterparty_prev_commitment_point = Readable::read(reader)?;
5576 let counterparty_node_id = Readable::read(reader)?;
5578 let counterparty_shutdown_scriptpubkey = Readable::read(reader)?;
5579 let commitment_secrets = Readable::read(reader)?;
5581 let channel_update_status = Readable::read(reader)?;
5583 #[cfg(any(test, feature = "fuzztarget"))]
5584 let mut historical_inbound_htlc_fulfills = HashSet::new();
5585 #[cfg(any(test, feature = "fuzztarget"))]
5587 let htlc_fulfills_len: u64 = Readable::read(reader)?;
5588 for _ in 0..htlc_fulfills_len {
5589 assert!(historical_inbound_htlc_fulfills.insert(Readable::read(reader)?));
5593 let pending_update_fee = if let Some(feerate) = pending_update_fee_value {
5594 Some((feerate, if channel_parameters.is_outbound_from_holder {
5595 FeeUpdateState::Outbound
5597 FeeUpdateState::AwaitingRemoteRevokeToAnnounce
5603 let mut announcement_sigs = None;
5604 let mut target_closing_feerate_sats_per_kw = None;
5605 let mut monitor_pending_finalized_fulfills = Some(Vec::new());
5606 // Prior to supporting channel type negotiation, all of our channels were static_remotekey
5607 // only, so we default to that if none was written.
5608 let mut channel_type = Some(ChannelTypeFeatures::only_static_remote_key());
5609 let mut channel_creation_height = Some(serialized_height);
5610 read_tlv_fields!(reader, {
5611 (0, announcement_sigs, option),
5612 (1, minimum_depth, option),
5613 (2, channel_type, option),
5614 (3, counterparty_selected_channel_reserve_satoshis, option),
5615 (5, config, option), // Note that if none is provided we will *not* overwrite the existing one.
5616 (7, shutdown_scriptpubkey, option),
5617 (9, target_closing_feerate_sats_per_kw, option),
5618 (11, monitor_pending_finalized_fulfills, vec_type),
5619 (13, channel_creation_height, option),
5622 let chan_features = channel_type.as_ref().unwrap();
5623 if chan_features.supports_unknown_bits() || chan_features.requires_unknown_bits() {
5624 // If the channel was written by a new version and negotiated with features we don't
5625 // understand yet, refuse to read it.
5626 return Err(DecodeError::UnknownRequiredFeature);
5629 let mut secp_ctx = Secp256k1::new();
5630 secp_ctx.seeded_randomize(&keys_source.get_secure_random_bytes());
5635 config: config.unwrap(),
5639 channel_value_satoshis,
5641 latest_monitor_update_id,
5644 shutdown_scriptpubkey,
5647 cur_holder_commitment_transaction_number,
5648 cur_counterparty_commitment_transaction_number,
5651 pending_inbound_htlcs,
5652 pending_outbound_htlcs,
5653 holding_cell_htlc_updates,
5657 monitor_pending_funding_locked,
5658 monitor_pending_revoke_and_ack,
5659 monitor_pending_commitment_signed,
5660 monitor_pending_forwards,
5661 monitor_pending_failures,
5662 monitor_pending_finalized_fulfills: monitor_pending_finalized_fulfills.unwrap(),
5665 holding_cell_update_fee,
5666 next_holder_htlc_id,
5667 next_counterparty_htlc_id,
5668 update_time_counter,
5671 #[cfg(debug_assertions)]
5672 holder_max_commitment_tx_output: Mutex::new((0, 0)),
5673 #[cfg(debug_assertions)]
5674 counterparty_max_commitment_tx_output: Mutex::new((0, 0)),
5676 last_sent_closing_fee: None,
5677 pending_counterparty_closing_signed: None,
5678 closing_fee_limits: None,
5679 target_closing_feerate_sats_per_kw,
5681 funding_tx_confirmed_in,
5682 funding_tx_confirmation_height,
5684 channel_creation_height: channel_creation_height.unwrap(),
5686 counterparty_dust_limit_satoshis,
5687 holder_dust_limit_satoshis,
5688 counterparty_max_htlc_value_in_flight_msat,
5689 counterparty_selected_channel_reserve_satoshis,
5690 counterparty_htlc_minimum_msat,
5691 holder_htlc_minimum_msat,
5692 counterparty_max_accepted_htlcs,
5695 counterparty_forwarding_info,
5697 channel_transaction_parameters: channel_parameters,
5698 funding_transaction,
5700 counterparty_cur_commitment_point,
5701 counterparty_prev_commitment_point,
5702 counterparty_node_id,
5704 counterparty_shutdown_scriptpubkey,
5708 channel_update_status,
5709 closing_signed_in_flight: false,
5713 #[cfg(any(test, feature = "fuzztarget"))]
5714 next_local_commitment_tx_fee_info_cached: Mutex::new(None),
5715 #[cfg(any(test, feature = "fuzztarget"))]
5716 next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
5718 workaround_lnd_bug_4006: None,
5720 #[cfg(any(test, feature = "fuzztarget"))]
5721 historical_inbound_htlc_fulfills,
5723 channel_type: channel_type.unwrap(),
5730 use bitcoin::util::bip143;
5731 use bitcoin::consensus::encode::serialize;
5732 use bitcoin::blockdata::script::{Script, Builder};
5733 use bitcoin::blockdata::transaction::{Transaction, TxOut, SigHashType};
5734 use bitcoin::blockdata::constants::genesis_block;
5735 use bitcoin::blockdata::opcodes;
5736 use bitcoin::network::constants::Network;
5737 use bitcoin::hashes::hex::FromHex;
5739 use ln::{PaymentPreimage, PaymentHash};
5740 use ln::channelmanager::{HTLCSource, PaymentId};
5741 use ln::channel::{Channel,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,HTLCCandidate,HTLCInitiator,TxCreationKeys};
5742 use ln::channel::MAX_FUNDING_SATOSHIS;
5743 use ln::features::InitFeatures;
5744 use ln::msgs::{ChannelUpdate, DataLossProtect, DecodeError, OptionalField, UnsignedChannelUpdate};
5745 use ln::script::ShutdownScript;
5747 use ln::chan_utils::{ChannelPublicKeys, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters, HTLC_SUCCESS_TX_WEIGHT, HTLC_TIMEOUT_TX_WEIGHT};
5748 use chain::BestBlock;
5749 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
5750 use chain::keysinterface::{InMemorySigner, KeysInterface, BaseSign};
5751 use chain::transaction::OutPoint;
5752 use util::config::UserConfig;
5753 use util::enforcing_trait_impls::EnforcingSigner;
5754 use util::errors::APIError;
5755 use util::test_utils;
5756 use util::test_utils::OnGetShutdownScriptpubkey;
5757 use util::logger::Logger;
5758 use bitcoin::secp256k1::{Secp256k1, Message, Signature, All};
5759 use bitcoin::secp256k1::ffi::Signature as FFISignature;
5760 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
5761 use bitcoin::secp256k1::recovery::RecoverableSignature;
5762 use bitcoin::hashes::sha256::Hash as Sha256;
5763 use bitcoin::hashes::Hash;
5764 use bitcoin::hash_types::{Txid, WPubkeyHash};
5765 use core::num::NonZeroU8;
5769 struct TestFeeEstimator {
5772 impl FeeEstimator for TestFeeEstimator {
5773 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u32 {
5779 fn test_max_funding_satoshis() {
5780 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
5781 "MAX_FUNDING_SATOSHIS is greater than all satoshis in existence");
5785 signer: InMemorySigner,
5787 impl KeysInterface for Keys {
5788 type Signer = InMemorySigner;
5790 fn get_node_secret(&self) -> SecretKey { panic!(); }
5791 fn get_destination_script(&self) -> Script {
5792 let secp_ctx = Secp256k1::signing_only();
5793 let channel_monitor_claim_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
5794 let channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
5795 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script()
5798 fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
5799 let secp_ctx = Secp256k1::signing_only();
5800 let channel_close_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
5801 ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key))
5804 fn get_channel_signer(&self, _inbound: bool, _channel_value_satoshis: u64) -> InMemorySigner {
5807 fn get_secure_random_bytes(&self) -> [u8; 32] { [0; 32] }
5808 fn read_chan_signer(&self, _data: &[u8]) -> Result<Self::Signer, DecodeError> { panic!(); }
5809 fn sign_invoice(&self, _invoice_preimage: Vec<u8>) -> Result<RecoverableSignature, ()> { panic!(); }
5812 fn public_from_secret_hex(secp_ctx: &Secp256k1<All>, hex: &str) -> PublicKey {
5813 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode(hex).unwrap()[..]).unwrap())
5817 fn upfront_shutdown_script_incompatibility() {
5818 let features = InitFeatures::known().clear_shutdown_anysegwit();
5819 let non_v0_segwit_shutdown_script =
5820 ShutdownScript::new_witness_program(NonZeroU8::new(16).unwrap(), &[0, 40]).unwrap();
5822 let seed = [42; 32];
5823 let network = Network::Testnet;
5824 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
5825 keys_provider.expect(OnGetShutdownScriptpubkey {
5826 returns: non_v0_segwit_shutdown_script.clone(),
5829 let fee_estimator = TestFeeEstimator { fee_est: 253 };
5830 let secp_ctx = Secp256k1::new();
5831 let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
5832 let config = UserConfig::default();
5833 match Channel::<EnforcingSigner>::new_outbound(&&fee_estimator, &&keys_provider, node_id, &features, 10000000, 100000, 42, &config, 0) {
5834 Err(APIError::IncompatibleShutdownScript { script }) => {
5835 assert_eq!(script.into_inner(), non_v0_segwit_shutdown_script.into_inner());
5837 Err(e) => panic!("Unexpected error: {:?}", e),
5838 Ok(_) => panic!("Expected error"),
5842 // Check that, during channel creation, we use the same feerate in the open channel message
5843 // as we do in the Channel object creation itself.
5845 fn test_open_channel_msg_fee() {
5846 let original_fee = 253;
5847 let mut fee_est = TestFeeEstimator{fee_est: original_fee };
5848 let secp_ctx = Secp256k1::new();
5849 let seed = [42; 32];
5850 let network = Network::Testnet;
5851 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
5853 let node_a_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
5854 let config = UserConfig::default();
5855 let node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_a_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config, 0).unwrap();
5857 // Now change the fee so we can check that the fee in the open_channel message is the
5858 // same as the old fee.
5859 fee_est.fee_est = 500;
5860 let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
5861 assert_eq!(open_channel_msg.feerate_per_kw, original_fee);
5865 fn test_holder_vs_counterparty_dust_limit() {
5866 // Test that when calculating the local and remote commitment transaction fees, the correct
5867 // dust limits are used.
5868 let feeest = TestFeeEstimator{fee_est: 15000};
5869 let secp_ctx = Secp256k1::new();
5870 let seed = [42; 32];
5871 let network = Network::Testnet;
5872 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
5874 // Go through the flow of opening a channel between two nodes, making sure
5875 // they have different dust limits.
5877 // Create Node A's channel pointing to Node B's pubkey
5878 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
5879 let config = UserConfig::default();
5880 let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config, 0).unwrap();
5882 // Create Node B's channel by receiving Node A's open_channel message
5883 // Make sure A's dust limit is as we expect.
5884 let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
5885 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
5886 let node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), &open_channel_msg, 7, &config, 0).unwrap();
5888 // Node B --> Node A: accept channel, explicitly setting B's dust limit.
5889 let mut accept_channel_msg = node_b_chan.get_accept_channel();
5890 accept_channel_msg.dust_limit_satoshis = 546;
5891 node_a_chan.accept_channel(&accept_channel_msg, &config, &InitFeatures::known()).unwrap();
5892 node_a_chan.holder_dust_limit_satoshis = 1560;
5894 // Put some inbound and outbound HTLCs in A's channel.
5895 let htlc_amount_msat = 11_092_000; // put an amount below A's effective dust limit but above B's.
5896 node_a_chan.pending_inbound_htlcs.push(InboundHTLCOutput {
5898 amount_msat: htlc_amount_msat,
5899 payment_hash: PaymentHash(Sha256::hash(&[42; 32]).into_inner()),
5900 cltv_expiry: 300000000,
5901 state: InboundHTLCState::Committed,
5904 node_a_chan.pending_outbound_htlcs.push(OutboundHTLCOutput {
5906 amount_msat: htlc_amount_msat, // put an amount below A's dust amount but above B's.
5907 payment_hash: PaymentHash(Sha256::hash(&[43; 32]).into_inner()),
5908 cltv_expiry: 200000000,
5909 state: OutboundHTLCState::Committed,
5910 source: HTLCSource::OutboundRoute {
5912 session_priv: SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
5913 first_hop_htlc_msat: 548,
5914 payment_id: PaymentId([42; 32]),
5915 payment_secret: None,
5920 // Make sure when Node A calculates their local commitment transaction, none of the HTLCs pass
5921 // the dust limit check.
5922 let htlc_candidate = HTLCCandidate::new(htlc_amount_msat, HTLCInitiator::LocalOffered);
5923 let local_commit_tx_fee = node_a_chan.next_local_commit_tx_fee_msat(htlc_candidate, None);
5924 let local_commit_fee_0_htlcs = Channel::<EnforcingSigner>::commit_tx_fee_msat(node_a_chan.feerate_per_kw, 0);
5925 assert_eq!(local_commit_tx_fee, local_commit_fee_0_htlcs);
5927 // Finally, make sure that when Node A calculates the remote's commitment transaction fees, all
5928 // of the HTLCs are seen to be above the dust limit.
5929 node_a_chan.channel_transaction_parameters.is_outbound_from_holder = false;
5930 let remote_commit_fee_3_htlcs = Channel::<EnforcingSigner>::commit_tx_fee_msat(node_a_chan.feerate_per_kw, 3);
5931 let htlc_candidate = HTLCCandidate::new(htlc_amount_msat, HTLCInitiator::LocalOffered);
5932 let remote_commit_tx_fee = node_a_chan.next_remote_commit_tx_fee_msat(htlc_candidate, None);
5933 assert_eq!(remote_commit_tx_fee, remote_commit_fee_3_htlcs);
5937 fn test_timeout_vs_success_htlc_dust_limit() {
5938 // Make sure that when `next_remote_commit_tx_fee_msat` and `next_local_commit_tx_fee_msat`
5939 // calculate the real dust limits for HTLCs (i.e. the dust limit given by the counterparty
5940 // *plus* the fees paid for the HTLC) they don't swap `HTLC_SUCCESS_TX_WEIGHT` for
5941 // `HTLC_TIMEOUT_TX_WEIGHT`, and vice versa.
5942 let fee_est = TestFeeEstimator{fee_est: 253 };
5943 let secp_ctx = Secp256k1::new();
5944 let seed = [42; 32];
5945 let network = Network::Testnet;
5946 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
5948 let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
5949 let config = UserConfig::default();
5950 let mut chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_id, &InitFeatures::known(), 10000000, 100000, 42, &config, 0).unwrap();
5952 let commitment_tx_fee_0_htlcs = Channel::<EnforcingSigner>::commit_tx_fee_msat(chan.feerate_per_kw, 0);
5953 let commitment_tx_fee_1_htlc = Channel::<EnforcingSigner>::commit_tx_fee_msat(chan.feerate_per_kw, 1);
5955 // If HTLC_SUCCESS_TX_WEIGHT and HTLC_TIMEOUT_TX_WEIGHT were swapped: then this HTLC would be
5956 // counted as dust when it shouldn't be.
5957 let htlc_amt_above_timeout = ((253 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + chan.holder_dust_limit_satoshis + 1) * 1000;
5958 let htlc_candidate = HTLCCandidate::new(htlc_amt_above_timeout, HTLCInitiator::LocalOffered);
5959 let commitment_tx_fee = chan.next_local_commit_tx_fee_msat(htlc_candidate, None);
5960 assert_eq!(commitment_tx_fee, commitment_tx_fee_1_htlc);
5962 // If swapped: this HTLC would be counted as non-dust when it shouldn't be.
5963 let dust_htlc_amt_below_success = ((253 * HTLC_SUCCESS_TX_WEIGHT / 1000) + chan.holder_dust_limit_satoshis - 1) * 1000;
5964 let htlc_candidate = HTLCCandidate::new(dust_htlc_amt_below_success, HTLCInitiator::RemoteOffered);
5965 let commitment_tx_fee = chan.next_local_commit_tx_fee_msat(htlc_candidate, None);
5966 assert_eq!(commitment_tx_fee, commitment_tx_fee_0_htlcs);
5968 chan.channel_transaction_parameters.is_outbound_from_holder = false;
5970 // If swapped: this HTLC would be counted as non-dust when it shouldn't be.
5971 let dust_htlc_amt_above_timeout = ((253 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + chan.counterparty_dust_limit_satoshis + 1) * 1000;
5972 let htlc_candidate = HTLCCandidate::new(dust_htlc_amt_above_timeout, HTLCInitiator::LocalOffered);
5973 let commitment_tx_fee = chan.next_remote_commit_tx_fee_msat(htlc_candidate, None);
5974 assert_eq!(commitment_tx_fee, commitment_tx_fee_0_htlcs);
5976 // If swapped: this HTLC would be counted as dust when it shouldn't be.
5977 let htlc_amt_below_success = ((253 * HTLC_SUCCESS_TX_WEIGHT / 1000) + chan.counterparty_dust_limit_satoshis - 1) * 1000;
5978 let htlc_candidate = HTLCCandidate::new(htlc_amt_below_success, HTLCInitiator::RemoteOffered);
5979 let commitment_tx_fee = chan.next_remote_commit_tx_fee_msat(htlc_candidate, None);
5980 assert_eq!(commitment_tx_fee, commitment_tx_fee_1_htlc);
5984 fn channel_reestablish_no_updates() {
5985 let feeest = TestFeeEstimator{fee_est: 15000};
5986 let logger = test_utils::TestLogger::new();
5987 let secp_ctx = Secp256k1::new();
5988 let seed = [42; 32];
5989 let network = Network::Testnet;
5990 let best_block = BestBlock::from_genesis(network);
5991 let chain_hash = best_block.block_hash();
5992 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
5994 // Go through the flow of opening a channel between two nodes.
5996 // Create Node A's channel pointing to Node B's pubkey
5997 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
5998 let config = UserConfig::default();
5999 let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config, 0).unwrap();
6001 // Create Node B's channel by receiving Node A's open_channel message
6002 let open_channel_msg = node_a_chan.get_open_channel(chain_hash);
6003 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
6004 let mut node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), &open_channel_msg, 7, &config, 0).unwrap();
6006 // Node B --> Node A: accept channel
6007 let accept_channel_msg = node_b_chan.get_accept_channel();
6008 node_a_chan.accept_channel(&accept_channel_msg, &config, &InitFeatures::known()).unwrap();
6010 // Node A --> Node B: funding created
6011 let output_script = node_a_chan.get_funding_redeemscript();
6012 let tx = Transaction { version: 1, lock_time: 0, input: Vec::new(), output: vec![TxOut {
6013 value: 10000000, script_pubkey: output_script.clone(),
6015 let funding_outpoint = OutPoint{ txid: tx.txid(), index: 0 };
6016 let funding_created_msg = node_a_chan.get_outbound_funding_created(tx.clone(), funding_outpoint, &&logger).unwrap();
6017 let (funding_signed_msg, _) = node_b_chan.funding_created(&funding_created_msg, best_block, &&logger).unwrap();
6019 // Node B --> Node A: funding signed
6020 let _ = node_a_chan.funding_signed(&funding_signed_msg, best_block, &&logger);
6022 // Now disconnect the two nodes and check that the commitment point in
6023 // Node B's channel_reestablish message is sane.
6024 node_b_chan.remove_uncommitted_htlcs_and_mark_paused(&&logger);
6025 let msg = node_b_chan.get_channel_reestablish(&&logger);
6026 assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
6027 assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
6028 match msg.data_loss_protect {
6029 OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
6030 assert_eq!(your_last_per_commitment_secret, [0; 32]);
6035 // Check that the commitment point in Node A's channel_reestablish message
6037 node_a_chan.remove_uncommitted_htlcs_and_mark_paused(&&logger);
6038 let msg = node_a_chan.get_channel_reestablish(&&logger);
6039 assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
6040 assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
6041 match msg.data_loss_protect {
6042 OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
6043 assert_eq!(your_last_per_commitment_secret, [0; 32]);
6050 fn channel_update() {
6051 let feeest = TestFeeEstimator{fee_est: 15000};
6052 let secp_ctx = Secp256k1::new();
6053 let seed = [42; 32];
6054 let network = Network::Testnet;
6055 let chain_hash = genesis_block(network).header.block_hash();
6056 let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
6058 // Create a channel.
6059 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
6060 let config = UserConfig::default();
6061 let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config, 0).unwrap();
6062 assert!(node_a_chan.counterparty_forwarding_info.is_none());
6063 assert_eq!(node_a_chan.holder_htlc_minimum_msat, 1); // the default
6064 assert!(node_a_chan.counterparty_forwarding_info().is_none());
6066 // Make sure that receiving a channel update will update the Channel as expected.
6067 let update = ChannelUpdate {
6068 contents: UnsignedChannelUpdate {
6070 short_channel_id: 0,
6073 cltv_expiry_delta: 100,
6074 htlc_minimum_msat: 5,
6075 htlc_maximum_msat: OptionalField::Absent,
6077 fee_proportional_millionths: 11,
6078 excess_data: Vec::new(),
6080 signature: Signature::from(unsafe { FFISignature::new() })
6082 node_a_chan.channel_update(&update).unwrap();
6084 // The counterparty can send an update with a higher minimum HTLC, but that shouldn't
6085 // change our official htlc_minimum_msat.
6086 assert_eq!(node_a_chan.holder_htlc_minimum_msat, 1);
6087 match node_a_chan.counterparty_forwarding_info() {
6089 assert_eq!(info.cltv_expiry_delta, 100);
6090 assert_eq!(info.fee_base_msat, 110);
6091 assert_eq!(info.fee_proportional_millionths, 11);
6093 None => panic!("expected counterparty forwarding info to be Some")
6098 fn outbound_commitment_test() {
6099 // Test vectors from BOLT 3 Appendix C:
6100 let feeest = TestFeeEstimator{fee_est: 15000};
6101 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
6102 let secp_ctx = Secp256k1::new();
6104 let mut signer = InMemorySigner::new(
6106 SecretKey::from_slice(&hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
6107 SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
6108 SecretKey::from_slice(&hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
6109 SecretKey::from_slice(&hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
6110 SecretKey::from_slice(&hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
6112 // These aren't set in the test vectors:
6113 [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],
6118 assert_eq!(signer.pubkeys().funding_pubkey.serialize()[..],
6119 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
6120 let keys_provider = Keys { signer: signer.clone() };
6122 let counterparty_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
6123 let mut config = UserConfig::default();
6124 config.channel_options.announced_channel = false;
6125 let mut chan = Channel::<InMemorySigner>::new_outbound(&&feeest, &&keys_provider, counterparty_node_id, &InitFeatures::known(), 10_000_000, 100000, 42, &config, 0).unwrap(); // Nothing uses their network key in this test
6126 chan.holder_dust_limit_satoshis = 546;
6127 chan.counterparty_selected_channel_reserve_satoshis = Some(0); // Filled in in accept_channel
6129 let funding_info = OutPoint{ txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), index: 0 };
6131 let counterparty_pubkeys = ChannelPublicKeys {
6132 funding_pubkey: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
6133 revocation_basepoint: PublicKey::from_slice(&hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap(),
6134 payment_point: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444"),
6135 delayed_payment_basepoint: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
6136 htlc_basepoint: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444")
6138 chan.channel_transaction_parameters.counterparty_parameters = Some(
6139 CounterpartyChannelTransactionParameters {
6140 pubkeys: counterparty_pubkeys.clone(),
6141 selected_contest_delay: 144
6143 chan.channel_transaction_parameters.funding_outpoint = Some(funding_info);
6144 signer.ready_channel(&chan.channel_transaction_parameters);
6146 assert_eq!(counterparty_pubkeys.payment_point.serialize()[..],
6147 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
6149 assert_eq!(counterparty_pubkeys.funding_pubkey.serialize()[..],
6150 hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
6152 assert_eq!(counterparty_pubkeys.htlc_basepoint.serialize()[..],
6153 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
6155 // We can't just use build_holder_transaction_keys here as the per_commitment_secret is not
6156 // derived from a commitment_seed, so instead we copy it here and call
6157 // build_commitment_transaction.
6158 let delayed_payment_base = &chan.holder_signer.pubkeys().delayed_payment_basepoint;
6159 let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
6160 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
6161 let htlc_basepoint = &chan.holder_signer.pubkeys().htlc_basepoint;
6162 let keys = TxCreationKeys::derive_new(&secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &counterparty_pubkeys.revocation_basepoint, &counterparty_pubkeys.htlc_basepoint).unwrap();
6164 macro_rules! test_commitment {
6165 ( $counterparty_sig_hex: expr, $sig_hex: expr, $tx_hex: expr, {
6166 $( { $htlc_idx: expr, $counterparty_htlc_sig_hex: expr, $htlc_sig_hex: expr, $htlc_tx_hex: expr } ), *
6168 let (commitment_tx, htlcs): (_, Vec<HTLCOutputInCommitment>) = {
6169 let mut commitment_stats = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, &logger);
6171 let htlcs = commitment_stats.htlcs_included.drain(..)
6172 .filter_map(|(htlc, _)| if htlc.transaction_output_index.is_some() { Some(htlc) } else { None })
6174 (commitment_stats.tx, htlcs)
6176 let trusted_tx = commitment_tx.trust();
6177 let unsigned_tx = trusted_tx.built_transaction();
6178 let redeemscript = chan.get_funding_redeemscript();
6179 let counterparty_signature = Signature::from_der(&hex::decode($counterparty_sig_hex).unwrap()[..]).unwrap();
6180 let sighash = unsigned_tx.get_sighash_all(&redeemscript, chan.channel_value_satoshis);
6181 secp_ctx.verify(&sighash, &counterparty_signature, chan.counterparty_funding_pubkey()).unwrap();
6183 let mut per_htlc: Vec<(HTLCOutputInCommitment, Option<Signature>)> = Vec::new();
6184 per_htlc.clear(); // Don't warn about excess mut for no-HTLC calls
6185 let mut counterparty_htlc_sigs = Vec::new();
6186 counterparty_htlc_sigs.clear(); // Don't warn about excess mut for no-HTLC calls
6188 let remote_signature = Signature::from_der(&hex::decode($counterparty_htlc_sig_hex).unwrap()[..]).unwrap();
6189 per_htlc.push((htlcs[$htlc_idx].clone(), Some(remote_signature)));
6190 counterparty_htlc_sigs.push(remote_signature);
6192 assert_eq!(htlcs.len(), per_htlc.len());
6194 let holder_commitment_tx = HolderCommitmentTransaction::new(
6195 commitment_tx.clone(),
6196 counterparty_signature,
6197 counterparty_htlc_sigs,
6198 &chan.holder_signer.pubkeys().funding_pubkey,
6199 chan.counterparty_funding_pubkey()
6201 let (holder_sig, htlc_sigs) = signer.sign_holder_commitment_and_htlcs(&holder_commitment_tx, &secp_ctx).unwrap();
6202 assert_eq!(Signature::from_der(&hex::decode($sig_hex).unwrap()[..]).unwrap(), holder_sig, "holder_sig");
6204 let funding_redeemscript = chan.get_funding_redeemscript();
6205 let tx = holder_commitment_tx.add_holder_sig(&funding_redeemscript, holder_sig);
6206 assert_eq!(serialize(&tx)[..], hex::decode($tx_hex).unwrap()[..], "tx");
6208 // ((htlc, counterparty_sig), (index, holder_sig))
6209 let mut htlc_sig_iter = holder_commitment_tx.htlcs().iter().zip(&holder_commitment_tx.counterparty_htlc_sigs).zip(htlc_sigs.iter().enumerate());
6212 let remote_signature = Signature::from_der(&hex::decode($counterparty_htlc_sig_hex).unwrap()[..]).unwrap();
6214 let ref htlc = htlcs[$htlc_idx];
6215 let htlc_tx = chan_utils::build_htlc_transaction(&unsigned_tx.txid, chan.feerate_per_kw,
6216 chan.get_counterparty_selected_contest_delay().unwrap(),
6217 &htlc, &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
6218 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
6219 let htlc_sighash = Message::from_slice(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, SigHashType::All)[..]).unwrap();
6220 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.countersignatory_htlc_key).unwrap();
6222 let mut preimage: Option<PaymentPreimage> = None;
6225 let out = PaymentHash(Sha256::hash(&[i; 32]).into_inner());
6226 if out == htlc.payment_hash {
6227 preimage = Some(PaymentPreimage([i; 32]));
6231 assert!(preimage.is_some());
6234 let htlc_sig = htlc_sig_iter.next().unwrap();
6235 assert_eq!((htlc_sig.0).0.transaction_output_index, Some($htlc_idx), "output index");
6237 let signature = Signature::from_der(&hex::decode($htlc_sig_hex).unwrap()[..]).unwrap();
6238 assert_eq!(signature, *(htlc_sig.1).1, "htlc sig");
6239 let index = (htlc_sig.1).0;
6240 let channel_parameters = chan.channel_transaction_parameters.as_holder_broadcastable();
6241 let trusted_tx = holder_commitment_tx.trust();
6242 assert_eq!(serialize(&trusted_tx.get_signed_htlc_tx(&channel_parameters, index, &(htlc_sig.0).1, (htlc_sig.1).1, &preimage))[..],
6243 hex::decode($htlc_tx_hex).unwrap()[..], "htlc tx");
6245 assert!(htlc_sig_iter.next().is_none());
6249 // simple commitment tx with no HTLCs
6250 chan.value_to_self_msat = 7000000000;
6252 test_commitment!("3045022100c3127b33dcc741dd6b05b1e63cbd1a9a7d816f37af9b6756fa2376b056f032370220408b96279808fe57eb7e463710804cdf4f108388bc5cf722d8c848d2c7f9f3b0",
6253 "30440220616210b2cc4d3afb601013c373bbd8aac54febd9f15400379a8cb65ce7deca60022034236c010991beb7ff770510561ae8dc885b8d38d1947248c38f2ae055647142",
6254 "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", {});
6256 chan.pending_inbound_htlcs.push({
6257 let mut out = InboundHTLCOutput{
6259 amount_msat: 1000000,
6261 payment_hash: PaymentHash([0; 32]),
6262 state: InboundHTLCState::Committed,
6264 out.payment_hash.0 = Sha256::hash(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap()).into_inner();
6267 chan.pending_inbound_htlcs.push({
6268 let mut out = InboundHTLCOutput{
6270 amount_msat: 2000000,
6272 payment_hash: PaymentHash([0; 32]),
6273 state: InboundHTLCState::Committed,
6275 out.payment_hash.0 = Sha256::hash(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()).into_inner();
6278 chan.pending_outbound_htlcs.push({
6279 let mut out = OutboundHTLCOutput{
6281 amount_msat: 2000000,
6283 payment_hash: PaymentHash([0; 32]),
6284 state: OutboundHTLCState::Committed,
6285 source: HTLCSource::dummy(),
6287 out.payment_hash.0 = Sha256::hash(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()).into_inner();
6290 chan.pending_outbound_htlcs.push({
6291 let mut out = OutboundHTLCOutput{
6293 amount_msat: 3000000,
6295 payment_hash: PaymentHash([0; 32]),
6296 state: OutboundHTLCState::Committed,
6297 source: HTLCSource::dummy(),
6299 out.payment_hash.0 = Sha256::hash(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()).into_inner();
6302 chan.pending_inbound_htlcs.push({
6303 let mut out = InboundHTLCOutput{
6305 amount_msat: 4000000,
6307 payment_hash: PaymentHash([0; 32]),
6308 state: InboundHTLCState::Committed,
6310 out.payment_hash.0 = Sha256::hash(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap()).into_inner();
6314 // commitment tx with all five HTLCs untrimmed (minimum feerate)
6315 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6316 chan.feerate_per_kw = 0;
6318 test_commitment!("3044022009b048187705a8cbc9ad73adbe5af148c3d012e1f067961486c822c7af08158c022006d66f3704cfab3eb2dc49dae24e4aa22a6910fc9b424007583204e3621af2e5",
6319 "304402206fc2d1f10ea59951eefac0b4b7c396a3c3d87b71ff0b019796ef4535beaf36f902201765b0181e514d04f4c8ad75659d7037be26cdb3f8bb6f78fe61decef484c3ea",
6320 "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", {
6323 "3045022100d9e29616b8f3959f1d3d7f7ce893ffedcdc407717d0de8e37d808c91d3a7c50d022078c3033f6d00095c8720a4bc943c1b45727818c082e4e3ddbc6d3116435b624b",
6324 "30440220636de5682ef0c5b61f124ec74e8aa2461a69777521d6998295dcea36bc3338110220165285594b23c50b28b82df200234566628a27bcd17f7f14404bd865354eb3ce",
6325 "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" },
6328 "30440220649fe8b20e67e46cbb0d09b4acea87dbec001b39b08dee7bdd0b1f03922a8640022037c462dff79df501cecfdb12ea7f4de91f99230bb544726f6e04527b1f896004",
6329 "3045022100803159dee7935dba4a1d36a61055ce8fd62caa528573cc221ae288515405a252022029c59e7cffce374fe860100a4a63787e105c3cf5156d40b12dd53ff55ac8cf3f",
6330 "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" },
6333 "30440220770fc321e97a19f38985f2e7732dd9fe08d16a2efa4bcbc0429400a447faf49102204d40b417f3113e1b0944ae0986f517564ab4acd3d190503faf97a6e420d43352",
6334 "3045022100a437cc2ce77400ecde441b3398fea3c3ad8bdad8132be818227fe3c5b8345989022069d45e7fa0ae551ec37240845e2c561ceb2567eacf3076a6a43a502d05865faa",
6335 "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" },
6338 "304402207bcbf4f60a9829b05d2dbab84ed593e0291836be715dc7db6b72a64caf646af802201e489a5a84f7c5cc130398b841d138d031a5137ac8f4c49c770a4959dc3c1363",
6339 "304402203121d9b9c055f354304b016a36662ee99e1110d9501cb271b087ddb6f382c2c80220549882f3f3b78d9c492de47543cb9a697cecc493174726146536c5954dac7487",
6340 "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" },
6343 "3044022076dca5cb81ba7e466e349b7128cdba216d4d01659e29b96025b9524aaf0d1899022060de85697b88b21c749702b7d2cfa7dfeaa1f472c8f1d7d9c23f2bf968464b87",
6344 "3045022100d9080f103cc92bac15ec42464a95f070c7fb6925014e673ee2ea1374d36a7f7502200c65294d22eb20d48564954d5afe04a385551919d8b2ddb4ae2459daaeee1d95",
6345 "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" }
6348 // commitment tx with seven outputs untrimmed (maximum feerate)
6349 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6350 chan.feerate_per_kw = 647;
6352 test_commitment!("3045022100a135f9e8a5ed25f7277446c67956b00ce6f610ead2bdec2c2f686155b7814772022059f1f6e1a8b336a68efcc1af3fe4d422d4827332b5b067501b099c47b7b5b5ee",
6353 "30450221009ec15c687898bb4da8b3a833e5ab8bfc51ec6e9202aaa8e66611edfd4a85ed1102203d7183e45078b9735c93450bc3415d3e5a8c576141a711ec6ddcb4a893926bb7",
6354 "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", {
6357 "30450221008437627f9ad84ac67052e2a414a4367b8556fd1f94d8b02590f89f50525cd33502205b9c21ff6e7fc864f2352746ad8ba59182510819acb644e25b8a12fc37bbf24f",
6358 "30440220344b0deb055230d01703e6c7acd45853c4af2328b49b5d8af4f88a060733406602202ea64f2a43d5751edfe75503cbc35a62e3141b5ed032fa03360faf4ca66f670b",
6359 "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" },
6362 "304402205a67f92bf6845cf2892b48d874ac1daf88a36495cf8a06f93d83180d930a6f75022031da1621d95c3f335cc06a3056cf960199dae600b7cf89088f65fc53cdbef28c",
6363 "30450221009e5e3822b0185c6799a95288c597b671d6cc69ab80f43740f00c6c3d0752bdda02206da947a74bd98f3175324dc56fdba86cc783703a120a6f0297537e60632f4c7f",
6364 "020000000001012cfb3e4788c206881d38f2996b6cb2109b5935acb527d14bdaa7b908afa9b2fe0100000000000000000124060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e050047304402205a67f92bf6845cf2892b48d874ac1daf88a36495cf8a06f93d83180d930a6f75022031da1621d95c3f335cc06a3056cf960199dae600b7cf89088f65fc53cdbef28c014830450221009e5e3822b0185c6799a95288c597b671d6cc69ab80f43740f00c6c3d0752bdda02206da947a74bd98f3175324dc56fdba86cc783703a120a6f0297537e60632f4c7f01008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000" },
6367 "30440220437e21766054a3eef7f65690c5bcfa9920babbc5af92b819f772f6ea96df6c7402207173622024bd97328cfb26c6665e25c2f5d67c319443ccdc60c903217005d8c8",
6368 "3045022100fcfc47e36b712624677626cef3dc1d67f6583bd46926a6398fe6b00b0c9a37760220525788257b187fc775c6370d04eadf34d06f3650a63f8df851cee0ecb47a1673",
6369 "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" },
6372 "304402207436e10737e4df499fc051686d3e11a5bb2310e4d1f1e691d287cef66514791202207cb58e71a6b7a42dd001b7e3ae672ea4f71ea3e1cd412b742e9124abb0739c64",
6373 "3045022100e78211b8409afb7255ffe37337da87f38646f1faebbdd61bc1920d69e3ead67a02201a626305adfcd16bfb7e9340928d9b6305464eab4aa4c4a3af6646e9b9f69dee",
6374 "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" },
6377 "30450221009acd6a827a76bfee50806178dfe0495cd4e1d9c58279c194c7b01520fe68cb8d022024d439047c368883e570997a7d40f0b430cb5a742f507965e7d3063ae3feccca",
6378 "3044022048762cf546bbfe474f1536365ea7c416e3c0389d60558bc9412cb148fb6ab68202207215d7083b75c96ff9d2b08c59c34e287b66820f530b486a9aa4cdd9c347d5b9",
6379 "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" }
6382 // commitment tx with six outputs untrimmed (minimum feerate)
6383 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6384 chan.feerate_per_kw = 648;
6386 test_commitment!("304402203948f900a5506b8de36a4d8502f94f21dd84fd9c2314ab427d52feaa7a0a19f2022059b6a37a4adaa2c5419dc8aea63c6e2a2ec4c4bde46207f6dc1fcd22152fc6e5",
6387 "3045022100b15f72908ba3382a34ca5b32519240a22300cc6015b6f9418635fb41f3d01d8802207adb331b9ed1575383dca0f2355e86c173802feecf8298fbea53b9d4610583e9",
6388 "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", {
6391 "3045022100a031202f3be94678f0e998622ee95ebb6ada8da1e9a5110228b5e04a747351e4022010ca6a21e18314ed53cfaae3b1f51998552a61a468e596368829a50ce40110e0",
6392 "304502210097e1873b57267730154595187a34949d3744f52933070c74757005e61ce2112e02204ecfba2aa42d4f14bdf8bad4206bb97217b702e6c433e0e1b0ce6587e6d46ec6",
6393 "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" },
6396 "304402202361012a634aee7835c5ecdd6413dcffa8f404b7e77364c792cff984e4ee71e90220715c5e90baa08daa45a7439b1ee4fa4843ed77b19c058240b69406606d384124",
6397 "3044022019de73b00f1d818fb388e83b2c8c31f6bce35ac624e215bc12f88f9dc33edf48022006ff814bb9f700ee6abc3294e146fac3efd4f13f0005236b41c0a946ee00c9ae",
6398 "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" },
6401 "304402207e8e82cd71ed4febeb593732c260456836e97d81896153ecd2b3cf320ca6861702202dd4a30f68f98ced7cc56a36369ac1fdd978248c5ff4ed204fc00cc625532989",
6402 "3045022100bd0be6100c4fd8f102ec220e1b053e4c4e2ecca25615490150007b40d314dc3902201a1e0ea266965b43164d9e6576f58fa6726d42883dd1c3996d2925c2e2260796",
6403 "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" },
6406 "3044022024cd52e4198c8ae0e414a86d86b5a65ea7450f2eb4e783096736d93395eca5ce022078f0094745b45be4d4b2b04dd5978c9e66ba49109e5704403e84aaf5f387d6be",
6407 "3045022100bbfb9d0a946d420807c86e985d636cceb16e71c3694ed186316251a00cbd807202207773223f9a337e145f64673825be9b30d07ef1542c82188b264bedcf7cda78c6",
6408 "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" }
6411 // commitment tx with six outputs untrimmed (maximum feerate)
6412 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6413 chan.feerate_per_kw = 2069;
6415 test_commitment!("304502210090b96a2498ce0c0f2fadbec2aab278fed54c1a7838df793ec4d2c78d96ec096202204fdd439c50f90d483baa7b68feeef4bd33bc277695405447bcd0bfb2ca34d7bc",
6416 "3045022100ad9a9bbbb75d506ca3b716b336ee3cf975dd7834fcf129d7dd188146eb58a8b4022061a759ee417339f7fe2ea1e8deb83abb6a74db31a09b7648a932a639cda23e33",
6417 "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", {
6420 "3045022100f33513ee38abf1c582876f921f8fddc06acff48e04515532a32d3938de938ffd02203aa308a2c1863b7d6fdf53159a1465bf2e115c13152546cc5d74483ceaa7f699",
6421 "3045022100a637902a5d4c9ba9e7c472a225337d5aac9e2e3f6744f76e237132e7619ba0400220035c60d784a031c0d9f6df66b7eab8726a5c25397399ee4aa960842059eb3f9d",
6422 "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" },
6425 "3045022100ce07682cf4b90093c22dc2d9ab2a77ad6803526b655ef857221cc96af5c9e0bf02200f501cee22e7a268af40b555d15a8237c9f36ad67ef1841daf9f6a0267b1e6df",
6426 "3045022100e57e46234f8782d3ff7aa593b4f7446fb5316c842e693dc63ee324fd49f6a1c302204a2f7b44c48bd26e1554422afae13153eb94b29d3687b733d18930615fb2db61",
6427 "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" },
6430 "3045022100e3e35492e55f82ec0bc2f317ffd7a486d1f7024330fe9743c3559fc39f32ef0c02203d1d4db651fc388a91d5ad8ecdd8e83673063bc8eefe27cfd8c189090e3a23e0",
6431 "3044022068613fb1b98eb3aec7f44c5b115b12343c2f066c4277c82b5f873dfe68f37f50022028109b4650f3f528ca4bfe9a467aff2e3e43893b61b5159157119d5d95cf1c18",
6432 "02000000000101adbe717a63fb658add30ada1e6e12ed257637581898abe475c11d7bbcd65bd4d020000000000000000015d060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100e3e35492e55f82ec0bc2f317ffd7a486d1f7024330fe9743c3559fc39f32ef0c02203d1d4db651fc388a91d5ad8ecdd8e83673063bc8eefe27cfd8c189090e3a23e001473044022068613fb1b98eb3aec7f44c5b115b12343c2f066c4277c82b5f873dfe68f37f50022028109b4650f3f528ca4bfe9a467aff2e3e43893b61b5159157119d5d95cf1c1801008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000" },
6435 "304402207475aeb0212ef9bf5130b60937817ad88c9a87976988ef1f323f026148cc4a850220739fea17ad3257dcad72e509c73eebe86bee30b178467b9fdab213d631b109df",
6436 "3045022100d315522e09e7d53d2a659a79cb67fef56d6c4bddf3f46df6772d0d20a7beb7c8022070bcc17e288607b6a72be0bd83368bb6d53488db266c1cdb4d72214e4f02ac33",
6437 "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" }
6440 // commitment tx with five outputs untrimmed (minimum feerate)
6441 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6442 chan.feerate_per_kw = 2070;
6444 test_commitment!("304402204ca1ba260dee913d318271d86e10ca0f5883026fb5653155cff600fb40895223022037b145204b7054a40e08bb1fefbd826f827b40838d3e501423bcc57924bcb50c",
6445 "3044022001014419b5ba00e083ac4e0a85f19afc848aacac2d483b4b525d15e2ae5adbfe022015ebddad6ee1e72b47cb09f3e78459da5be01ccccd95dceca0e056a00cc773c1",
6446 "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", {
6449 "304402205f6b6d12d8d2529fb24f4445630566cf4abbd0f9330ab6c2bdb94222d6a2a0c502202f556258ae6f05b193749e4c541dfcc13b525a5422f6291f073f15617ba8579b",
6450 "30440220150b11069454da70caf2492ded9e0065c9a57f25ac2a4c52657b1d15b6c6ed85022068a38833b603c8892717206383611bad210f1cbb4b1f87ea29c6c65b9e1cb3e5",
6451 "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" },
6454 "3045022100f960dfb1c9aee7ce1437efa65b523e399383e8149790e05d8fed27ff6e42fe0002202fe8613e062ffe0b0c518cc4101fba1c6de70f64a5bcc7ae663f2efae43b8546",
6455 "30450221009a6ed18e6873bc3644332a6ee21c152a5b102821865350df7a8c74451a51f9f2022050d801fb4895d7d7fbf452824c0168347f5c0cbe821cf6a97a63af5b8b2563c6",
6456 "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" },
6459 "3045022100ae5fc7717ae684bc1fcf9020854e5dbe9842c9e7472879ac06ff95ac2bb10e4e022057728ada4c00083a3e65493fb5d50a232165948a1a0f530ef63185c2c8c56504",
6460 "30440220408ad3009827a8fccf774cb285587686bfb2ed041f89a89453c311ce9c8ee0f902203c7392d9f8306d3a46522a66bd2723a7eb2628cb2d9b34d4c104f1766bf37502",
6461 "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" }
6464 // commitment tx with five outputs untrimmed (maximum feerate)
6465 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6466 chan.feerate_per_kw = 2194;
6468 test_commitment!("304402204bb3d6e279d71d9da414c82de42f1f954267c762b2e2eb8b76bc3be4ea07d4b0022014febc009c5edc8c3fc5d94015de163200f780046f1c293bfed8568f08b70fb3",
6469 "3044022072c2e2b1c899b2242656a537dde2892fa3801be0d6df0a87836c550137acde8302201654aa1974d37a829083c3ba15088689f30b56d6a4f6cb14c7bad0ee3116d398",
6470 "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", {
6473 "3045022100939726680351a7856c1bc386d4a1f422c7d29bd7b56afc139570f508474e6c40022023175a799ccf44c017fbaadb924c40b2a12115a5b7d0dfd3228df803a2de8450",
6474 "304502210099c98c2edeeee6ec0fb5f3bea8b79bb016a2717afa9b5072370f34382de281d302206f5e2980a995e045cf90a547f0752a7ee99d48547bc135258fe7bc07e0154301",
6475 "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" },
6478 "3044022021bb883bf324553d085ba2e821cad80c28ef8b303dbead8f98e548783c02d1600220638f9ef2a9bba25869afc923f4b5dc38be3bb459f9efa5d869392d5f7779a4a0",
6479 "3045022100fd85bd7697b89c08ec12acc8ba89b23090637d83abd26ca37e01ae93e67c367302202b551fe69386116c47f984aab9c8dfd25d864dcde5d3389cfbef2447a85c4b77",
6480 "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" },
6483 "3045022100c9e6f0454aa598b905a35e641a70cc9f67b5f38cc4b00843a041238c4a9f1c4a0220260a2822a62da97e44583e837245995ca2e36781769c52f19e498efbdcca262b",
6484 "30450221008a9f2ea24cd455c2b64c1472a5fa83865b0a5f49a62b661801e884cf2849af8302204d44180e50bf6adfcf1c1e581d75af91aba4e28681ce4a5ee5f3cbf65eca10f3",
6485 "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" }
6488 // commitment tx with four outputs untrimmed (minimum feerate)
6489 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6490 chan.feerate_per_kw = 2195;
6492 test_commitment!("304402201a8c1b1f9671cd9e46c7323a104d7047cc48d3ee80d40d4512e0c72b8dc65666022066d7f9a2ce18c9eb22d2739ffcce05721c767f9b607622a31b6ea5793ddce403",
6493 "3044022044d592025b610c0d678f65032e87035cdfe89d1598c522cc32524ae8172417c30220749fef9d5b2ae8cdd91ece442ba8809bc891efedae2291e578475f97715d1767",
6494 "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", {
6497 "3045022100e57b845066a06ee7c2cbfc29eabffe52daa9bf6f6de760066d04df9f9b250e0002202ffb197f0e6e0a77a75a9aff27014bd3de83b7f748d7efef986abe655e1dd50e",
6498 "3045022100ecc8c6529d0b2316d046f0f0757c1e1c25a636db168ec4f3aa1b9278df685dc0022067ae6b65e936f1337091f7b18a15935b608c5f2cdddb2f892ed0babfdd376d76",
6499 "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" },
6502 "3045022100d193b7ecccad8057571620a0b1ffa6c48e9483311723b59cf536043b20bc51550220546d4bd37b3b101ecda14f6c907af46ec391abce1cd9c7ce22b1a62b534f2f2a",
6503 "3044022014d66f11f9cacf923807eba49542076c5fe5cccf252fb08fe98c78ef3ca6ab5402201b290dbe043cc512d9d78de074a5a129b8759bc6a6c546b190d120b690bd6e82",
6504 "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" }
6507 // commitment tx with four outputs untrimmed (maximum feerate)
6508 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6509 chan.feerate_per_kw = 3702;
6511 test_commitment!("304502210092a587aeb777f869e7ff0d7898ea619ee26a3dacd1f3672b945eea600be431100220077ee9eae3528d15251f2a52b607b189820e57a6ccfac8d1af502b132ee40169",
6512 "3045022100e5efb73c32d32da2d79702299b6317de6fb24a60476e3855926d78484dd1b3c802203557cb66a42c944ef06e00bcc4da35a5bcb2f185aab0f8e403e519e1d66aaf75",
6513 "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", {
6516 "304402206fa54c11f98c3bae1e93df43fc7affeb05b476bf8060c03e29c377c69bc08e8b0220672701cce50d5c379ff45a5d2cfe48ac44973adb066ac32608e21221d869bb89",
6517 "304402206e36c683ebf2cb16bcef3d5439cf8b53cd97280a365ed8acd7abb85a8ba5f21c02206e8621edfc2a5766cbc96eb67fd501127ff163eb6b85518a39f7d4974aef126f",
6518 "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" },
6521 "3044022057649739b0eb74d541ead0dfdb3d4b2c15aa192720031044c3434c67812e5ca902201e5ede42d960ae551707f4a6b34b09393cf4dee2418507daa022e3550dbb5817",
6522 "304402207faad26678c8850e01b4a0696d60841f7305e1832b786110ee9075cb92ed14a30220516ef8ee5dfa80824ea28cbcec0dd95f8b847146257c16960db98507db15ffdc",
6523 "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" }
6526 // commitment tx with three outputs untrimmed (minimum feerate)
6527 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6528 chan.feerate_per_kw = 3703;
6530 test_commitment!("3045022100b495d239772a237ff2cf354b1b11be152fd852704cb184e7356d13f2fb1e5e430220723db5cdb9cbd6ead7bfd3deb419cf41053a932418cbb22a67b581f40bc1f13e",
6531 "304402201b736d1773a124c745586217a75bed5f66c05716fbe8c7db4fdb3c3069741cdd02205083f39c321c1bcadfc8d97e3c791a66273d936abac0c6a2fde2ed46019508e1",
6532 "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", {
6535 "3045022100c34c61735f93f2e324cc873c3b248111ccf8f6db15d5969583757010d4ad2b4602207867bb919b2ddd6387873e425345c9b7fd18d1d66aba41f3607bc2896ef3c30a",
6536 "3045022100988c143e2110067117d2321bdd4bd16ca1734c98b29290d129384af0962b634e02206c1b02478878c5f547018b833986578f90c3e9be669fe5788ad0072a55acbb05",
6537 "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" }
6540 // commitment tx with three outputs untrimmed (maximum feerate)
6541 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6542 chan.feerate_per_kw = 4914;
6544 test_commitment!("3045022100b4b16d5f8cc9fc4c1aff48831e832a0d8990e133978a66e302c133550954a44d022073573ce127e2200d316f6b612803a5c0c97b8d20e1e44dbe2ac0dd2fb8c95244",
6545 "3045022100d72638bc6308b88bb6d45861aae83e5b9ff6e10986546e13bce769c70036e2620220320be7c6d66d22f30b9fcd52af66531505b1310ca3b848c19285b38d8a1a8c19",
6546 "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", {
6549 "3045022100f43591c156038ba217756006bb3c55f7d113a325cdd7d9303c82115372858d68022016355b5aadf222bc8d12e426c75f4a03423917b2443a103eb2a498a3a2234374",
6550 "30440220585dee80fafa264beac535c3c0bb5838ac348b156fdc982f86adc08dfc9bfd250220130abb82f9f295cc9ef423dcfef772fde2acd85d9df48cc538981d26a10a9c10",
6551 "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" }
6554 // commitment tx with two outputs untrimmed (minimum feerate)
6555 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6556 chan.feerate_per_kw = 4915;
6558 test_commitment!("304402203a286936e74870ca1459c700c71202af0381910a6bfab687ef494ef1bc3e02c902202506c362d0e3bee15e802aa729bf378e051644648253513f1c085b264cc2a720",
6559 "30450221008a953551f4d67cb4df3037207fc082ddaf6be84d417b0bd14c80aab66f1b01a402207508796dc75034b2dee876fe01dc05a08b019f3e5d689ac8842ade2f1befccf5",
6560 "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", {});
6562 // commitment tx with two outputs untrimmed (maximum feerate)
6563 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6564 chan.feerate_per_kw = 9651180;
6566 test_commitment!("304402200a8544eba1d216f5c5e530597665fa9bec56943c0f66d98fc3d028df52d84f7002201e45fa5c6bc3a506cc2553e7d1c0043a9811313fc39c954692c0d47cfce2bbd3",
6567 "3045022100e11b638c05c650c2f63a421d36ef8756c5ce82f2184278643520311cdf50aa200220259565fb9c8e4a87ccaf17f27a3b9ca4f20625754a0920d9c6c239d8156a11de",
6568 "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", {});
6570 // commitment tx with one output untrimmed (minimum feerate)
6571 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6572 chan.feerate_per_kw = 9651181;
6574 test_commitment!("304402202ade0142008309eb376736575ad58d03e5b115499709c6db0b46e36ff394b492022037b63d78d66404d6504d4c4ac13be346f3d1802928a6d3ad95a6a944227161a2",
6575 "304402207e8d51e0c570a5868a78414f4e0cbfaed1106b171b9581542c30718ee4eb95ba02203af84194c97adf98898c9afe2f2ed4a7f8dba05a2dfab28ac9d9c604aa49a379",
6576 "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", {});
6578 // commitment tx with fee greater than funder amount
6579 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
6580 chan.feerate_per_kw = 9651936;
6582 test_commitment!("304402202ade0142008309eb376736575ad58d03e5b115499709c6db0b46e36ff394b492022037b63d78d66404d6504d4c4ac13be346f3d1802928a6d3ad95a6a944227161a2",
6583 "304402207e8d51e0c570a5868a78414f4e0cbfaed1106b171b9581542c30718ee4eb95ba02203af84194c97adf98898c9afe2f2ed4a7f8dba05a2dfab28ac9d9c604aa49a379",
6584 "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", {});
6586 // commitment tx with 3 htlc outputs, 2 offered having the same amount and preimage
6587 chan.value_to_self_msat = 7_000_000_000 - 2_000_000;
6588 chan.feerate_per_kw = 253;
6589 chan.pending_inbound_htlcs.clear();
6590 chan.pending_inbound_htlcs.push({
6591 let mut out = InboundHTLCOutput{
6593 amount_msat: 2000000,
6595 payment_hash: PaymentHash([0; 32]),
6596 state: InboundHTLCState::Committed,
6598 out.payment_hash.0 = Sha256::hash(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()).into_inner();
6601 chan.pending_outbound_htlcs.clear();
6602 chan.pending_outbound_htlcs.push({
6603 let mut out = OutboundHTLCOutput{
6605 amount_msat: 5000000,
6607 payment_hash: PaymentHash([0; 32]),
6608 state: OutboundHTLCState::Committed,
6609 source: HTLCSource::dummy(),
6611 out.payment_hash.0 = Sha256::hash(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).into_inner();
6614 chan.pending_outbound_htlcs.push({
6615 let mut out = OutboundHTLCOutput{
6617 amount_msat: 5000000,
6619 payment_hash: PaymentHash([0; 32]),
6620 state: OutboundHTLCState::Committed,
6621 source: HTLCSource::dummy(),
6623 out.payment_hash.0 = Sha256::hash(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()).into_inner();
6627 test_commitment!("30440220048705bec5288d28b3f29344b8d124853b1af423a568664d2c6f02c8ea886525022060f998a461052a2476b912db426ea2a06700953a241135c7957f2e79bc222df9",
6628 "3045022100c4f1d60b6fca9febc8b39de1a31e84c5f7c4b41c97239ef05f4350aa484c6b5e02200c5134ac8b20eb7a29d0dd4a501f6aa8fefb8489171f4cb408bd2a32324ab03f",
6629 "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", {
6632 "304502210081cbb94121761d34c189cd4e6a281feea6f585060ad0ba2632e8d6b3c6bb8a6c02201007981bbd16539d63df2805b5568f1f5688cd2a885d04706f50db9b77ba13c6",
6633 "304502210090ed76aeb21b53236a598968abc66e2024691d07b62f53ddbeca8f93144af9c602205f873af5a0c10e62690e9aba09740550f194a9dc455ba4c1c23f6cde7704674c",
6634 "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" },
6636 "304402201d0f09d2bf7bc245a4f17980e1e9164290df16c70c6a2ff1592f5030d6108581022061e744a7dc151b36bf0aff7a4f1812ba90b8b03633bb979a270d19858fd960c5",
6637 "30450221009aef000d2e843a4202c1b1a2bf554abc9a7902bf49b2cb0759bc507456b7ebad02204e7c3d193ede2fd2b4cd6b39f51a920e581e35575e357e44d7b699c40ce61d39",
6638 "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" },
6640 "30440220010bf035d5823596e50dce2076a4d9f942d8d28031c9c428b901a02b6b8140de02203250e8e4a08bc5b4ecdca4d0eedf98223e02e3ac1c0206b3a7ffdb374aa21e5f",
6641 "30440220073de0067b88e425b3018b30366bfeda0ccb703118ccd3d02ead08c0f53511d002203fac50ac0e4cf8a3af0b4b1b12e801650591f748f8ddf1e089c160f10b69e511",
6642 "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" }
6647 fn test_per_commitment_secret_gen() {
6648 // Test vectors from BOLT 3 Appendix D:
6650 let mut seed = [0; 32];
6651 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
6652 assert_eq!(chan_utils::build_commitment_secret(&seed, 281474976710655),
6653 hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
6655 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
6656 assert_eq!(chan_utils::build_commitment_secret(&seed, 281474976710655),
6657 hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
6659 assert_eq!(chan_utils::build_commitment_secret(&seed, 0xaaaaaaaaaaa),
6660 hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
6662 assert_eq!(chan_utils::build_commitment_secret(&seed, 0x555555555555),
6663 hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
6665 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
6666 assert_eq!(chan_utils::build_commitment_secret(&seed, 1),
6667 hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
6671 fn test_key_derivation() {
6672 // Test vectors from BOLT 3 Appendix E:
6673 let secp_ctx = Secp256k1::new();
6675 let base_secret = SecretKey::from_slice(&hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
6676 let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
6678 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
6679 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
6681 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
6682 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
6684 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
6685 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
6687 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
6688 SecretKey::from_slice(&hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
6690 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
6691 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
6693 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
6694 SecretKey::from_slice(&hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());