use crate::ln::{PaymentPreimage, PaymentHash};
use crate::ln::features::{ChannelTypeFeatures, InitFeatures};
use crate::ln::msgs;
-use crate::ln::msgs::{DecodeError, OptionalField, DataLossProtect};
+use crate::ln::msgs::DecodeError;
use crate::ln::script::{self, ShutdownScript};
use crate::ln::channelmanager::{self, CounterpartyForwardingInfo, PendingHTLCStatus, HTLCSource, SentHTLCId, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT};
use crate::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};
use crate::chain::chaininterface::{FeeEstimator, ConfirmationTarget, LowerBoundedFeeEstimator};
use crate::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, LATENCY_GRACE_PERIOD_BLOCKS, CLOSED_CHANNEL_UPDATE_ID};
use crate::chain::transaction::{OutPoint, TransactionData};
-use crate::chain::keysinterface::{WriteableEcdsaChannelSigner, EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
+use crate::sign::{WriteableEcdsaChannelSigner, EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
use crate::events::ClosureReason;
use crate::routing::gossip::NodeId;
use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer, VecWriter};
pub outbound_capacity_msat: u64,
/// The maximum value we can assign to the next outbound HTLC
pub next_outbound_htlc_limit_msat: u64,
+ /// The minimum value we can assign to the next outbound HTLC
+ pub next_outbound_htlc_minimum_msat: u64,
}
#[derive(Debug, Clone, Copy, PartialEq)]
secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
let shutdown_scriptpubkey = if config.channel_handshake_config.commit_upfront_shutdown_pubkey {
- Some(signer_provider.get_shutdown_scriptpubkey())
+ match signer_provider.get_shutdown_scriptpubkey() {
+ Ok(scriptpubkey) => Some(scriptpubkey),
+ Err(_) => return Err(APIError::ChannelUnavailable { err: "Failed to get shutdown scriptpubkey".to_owned()}),
+ }
} else { None };
if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
}
}
+ let destination_script = match signer_provider.get_destination_script() {
+ Ok(script) => script,
+ Err(_) => return Err(APIError::ChannelUnavailable { err: "Failed to get destination script".to_owned()}),
+ };
+
let temporary_channel_id = entropy_source.get_secure_random_bytes();
Ok(Channel {
holder_signer,
shutdown_scriptpubkey,
- destination_script: signer_provider.get_destination_script(),
+ destination_script,
cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
match &msg.shutdown_scriptpubkey {
- &OptionalField::Present(ref script) => {
+ &Some(ref script) => {
// Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
if script.len() == 0 {
None
}
},
// 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
- &OptionalField::Absent => {
+ &None => {
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()));
}
}
} else { None };
let shutdown_scriptpubkey = if config.channel_handshake_config.commit_upfront_shutdown_pubkey {
- Some(signer_provider.get_shutdown_scriptpubkey())
+ match signer_provider.get_shutdown_scriptpubkey() {
+ Ok(scriptpubkey) => Some(scriptpubkey),
+ Err(_) => return Err(ChannelError::Close("Failed to get upfront shutdown scriptpubkey".to_owned())),
+ }
} else { None };
if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
}
}
+ let destination_script = match signer_provider.get_destination_script() {
+ Ok(script) => script,
+ Err(_) => return Err(ChannelError::Close("Failed to get destination script".to_owned())),
+ };
+
let mut secp_ctx = Secp256k1::new();
secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
holder_signer,
shutdown_scriptpubkey,
- destination_script: signer_provider.get_destination_script(),
+ destination_script,
cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
match &msg.shutdown_scriptpubkey {
- &OptionalField::Present(ref script) => {
+ &Some(ref script) => {
// Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
if script.len() == 0 {
None
}
},
// 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
- &OptionalField::Absent => {
+ &None => {
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()));
}
}
/// corner case properly.
pub fn get_available_balances(&self) -> AvailableBalances {
// Note that we have to handle overflow due to the above case.
+ let inbound_stats = self.get_inbound_pending_htlc_stats(None);
let outbound_stats = self.get_outbound_pending_htlc_stats(None);
let mut balance_msat = self.value_to_self_msat;
}
balance_msat -= outbound_stats.pending_htlcs_value_msat;
- let outbound_capacity_msat = cmp::max(self.value_to_self_msat as i64
- - outbound_stats.pending_htlcs_value_msat as i64
- - self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0) as i64 * 1000,
- 0) as u64;
+ let outbound_capacity_msat = self.value_to_self_msat
+ .saturating_sub(outbound_stats.pending_htlcs_value_msat)
+ .saturating_sub(
+ self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0) * 1000);
+
+ let mut available_capacity_msat = outbound_capacity_msat;
+
+ if self.is_outbound() {
+ // We should mind channel commit tx fee when computing how much of the available capacity
+ // can be used in the next htlc. Mirrors the logic in send_htlc.
+ //
+ // The fee depends on whether the amount we will be sending is above dust or not,
+ // and the answer will in turn change the amount itself — making it a circular
+ // dependency.
+ // This complicates the computation around dust-values, up to the one-htlc-value.
+ let mut real_dust_limit_timeout_sat = self.holder_dust_limit_satoshis;
+ if !self.opt_anchors() {
+ real_dust_limit_timeout_sat += self.feerate_per_kw as u64 * htlc_timeout_tx_weight(false) / 1000;
+ }
+
+ let htlc_above_dust = HTLCCandidate::new(real_dust_limit_timeout_sat * 1000, HTLCInitiator::LocalOffered);
+ let max_reserved_commit_tx_fee_msat = FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE * self.next_local_commit_tx_fee_msat(htlc_above_dust, Some(()));
+ let htlc_dust = HTLCCandidate::new(real_dust_limit_timeout_sat * 1000 - 1, HTLCInitiator::LocalOffered);
+ let min_reserved_commit_tx_fee_msat = FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE * self.next_local_commit_tx_fee_msat(htlc_dust, Some(()));
+
+ // We will first subtract the fee as if we were above-dust. Then, if the resulting
+ // value ends up being below dust, we have this fee available again. In that case,
+ // match the value to right-below-dust.
+ let mut capacity_minus_commitment_fee_msat: i64 = (available_capacity_msat as i64) - (max_reserved_commit_tx_fee_msat as i64);
+ if capacity_minus_commitment_fee_msat < (real_dust_limit_timeout_sat as i64) * 1000 {
+ let one_htlc_difference_msat = max_reserved_commit_tx_fee_msat - min_reserved_commit_tx_fee_msat;
+ debug_assert!(one_htlc_difference_msat != 0);
+ capacity_minus_commitment_fee_msat += one_htlc_difference_msat as i64;
+ capacity_minus_commitment_fee_msat = cmp::min(real_dust_limit_timeout_sat as i64 * 1000 - 1, capacity_minus_commitment_fee_msat);
+ available_capacity_msat = cmp::max(0, cmp::min(capacity_minus_commitment_fee_msat, available_capacity_msat as i64)) as u64;
+ } else {
+ available_capacity_msat = capacity_minus_commitment_fee_msat as u64;
+ }
+ } else {
+ // If the channel is inbound (i.e. counterparty pays the fee), we need to make sure
+ // sending a new HTLC won't reduce their balance below our reserve threshold.
+ let mut real_dust_limit_success_sat = self.counterparty_dust_limit_satoshis;
+ if !self.opt_anchors() {
+ real_dust_limit_success_sat += self.feerate_per_kw as u64 * htlc_success_tx_weight(false) / 1000;
+ }
+
+ let htlc_above_dust = HTLCCandidate::new(real_dust_limit_success_sat * 1000, HTLCInitiator::LocalOffered);
+ let max_reserved_commit_tx_fee_msat = self.next_remote_commit_tx_fee_msat(htlc_above_dust, None);
+
+ let holder_selected_chan_reserve_msat = self.holder_selected_channel_reserve_satoshis * 1000;
+ let remote_balance_msat = (self.channel_value_satoshis * 1000 - self.value_to_self_msat)
+ .saturating_sub(inbound_stats.pending_htlcs_value_msat);
+
+ if remote_balance_msat < max_reserved_commit_tx_fee_msat + holder_selected_chan_reserve_msat {
+ // If another HTLC's fee would reduce the remote's balance below the reserve limit
+ // we've selected for them, we can only send dust HTLCs.
+ available_capacity_msat = cmp::min(available_capacity_msat, real_dust_limit_success_sat * 1000 - 1);
+ }
+ }
+
+ let mut next_outbound_htlc_minimum_msat = self.counterparty_htlc_minimum_msat;
+
+ // If we get close to our maximum dust exposure, we end up in a situation where we can send
+ // between zero and the remaining dust exposure limit remaining OR above the dust limit.
+ // Because we cannot express this as a simple min/max, we prefer to tell the user they can
+ // send above the dust limit (as the router can always overpay to meet the dust limit).
+ let mut remaining_msat_below_dust_exposure_limit = None;
+ let mut dust_exposure_dust_limit_msat = 0;
+
+ let (htlc_success_dust_limit, htlc_timeout_dust_limit) = if self.opt_anchors() {
+ (self.counterparty_dust_limit_satoshis, self.holder_dust_limit_satoshis)
+ } else {
+ let dust_buffer_feerate = self.get_dust_buffer_feerate(None) as u64;
+ (self.counterparty_dust_limit_satoshis + dust_buffer_feerate * htlc_success_tx_weight(false) / 1000,
+ self.holder_dust_limit_satoshis + dust_buffer_feerate * htlc_timeout_tx_weight(false) / 1000)
+ };
+ let on_counterparty_dust_htlc_exposure_msat = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat;
+ if on_counterparty_dust_htlc_exposure_msat as i64 + htlc_success_dust_limit as i64 * 1000 - 1 > self.get_max_dust_htlc_exposure_msat() as i64 {
+ remaining_msat_below_dust_exposure_limit =
+ Some(self.get_max_dust_htlc_exposure_msat().saturating_sub(on_counterparty_dust_htlc_exposure_msat));
+ dust_exposure_dust_limit_msat = cmp::max(dust_exposure_dust_limit_msat, htlc_success_dust_limit * 1000);
+ }
+
+ let on_holder_dust_htlc_exposure_msat = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat;
+ if on_holder_dust_htlc_exposure_msat as i64 + htlc_timeout_dust_limit as i64 * 1000 - 1 > self.get_max_dust_htlc_exposure_msat() as i64 {
+ remaining_msat_below_dust_exposure_limit = Some(cmp::min(
+ remaining_msat_below_dust_exposure_limit.unwrap_or(u64::max_value()),
+ self.get_max_dust_htlc_exposure_msat().saturating_sub(on_holder_dust_htlc_exposure_msat)));
+ dust_exposure_dust_limit_msat = cmp::max(dust_exposure_dust_limit_msat, htlc_timeout_dust_limit * 1000);
+ }
+
+ if let Some(remaining_limit_msat) = remaining_msat_below_dust_exposure_limit {
+ if available_capacity_msat < dust_exposure_dust_limit_msat {
+ available_capacity_msat = cmp::min(available_capacity_msat, remaining_limit_msat);
+ } else {
+ next_outbound_htlc_minimum_msat = cmp::max(next_outbound_htlc_minimum_msat, dust_exposure_dust_limit_msat);
+ }
+ }
+
+ available_capacity_msat = cmp::min(available_capacity_msat,
+ self.counterparty_max_htlc_value_in_flight_msat - outbound_stats.pending_htlcs_value_msat);
+
+ if outbound_stats.pending_htlcs + 1 > self.counterparty_max_accepted_htlcs as u32 {
+ available_capacity_msat = 0;
+ }
+
AvailableBalances {
inbound_capacity_msat: cmp::max(self.channel_value_satoshis as i64 * 1000
- self.value_to_self_msat as i64
- self.holder_selected_channel_reserve_satoshis as i64 * 1000,
0) as u64,
outbound_capacity_msat,
- next_outbound_htlc_limit_msat: cmp::max(cmp::min(outbound_capacity_msat as i64,
- self.counterparty_max_htlc_value_in_flight_msat as i64
- - outbound_stats.pending_htlcs_value_msat as i64),
- 0) as u64,
+ next_outbound_htlc_limit_msat: available_capacity_msat,
+ next_outbound_htlc_minimum_msat,
balance_msat,
}
}
if msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
msg.next_local_commitment_number == 0 {
- return Err(ChannelError::Close("Peer sent a garbage channel_reestablish".to_owned()));
+ return Err(ChannelError::Close("Peer sent a garbage channel_reestablish (usually an lnd node with lost state asking us to force-close for them)".to_owned()));
}
if msg.next_remote_commitment_number > 0 {
- match msg.data_loss_protect {
- OptionalField::Present(ref data_loss) => {
- let expected_point = self.holder_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.secp_ctx);
- let given_secret = SecretKey::from_slice(&data_loss.your_last_per_commitment_secret)
- .map_err(|_| ChannelError::Close("Peer sent a garbage channel_reestablish with unparseable secret key".to_owned()))?;
- if expected_point != PublicKey::from_secret_key(&self.secp_ctx, &given_secret) {
- return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
- }
- if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
- macro_rules! log_and_panic {
- ($err_msg: expr) => {
- log_error!(logger, $err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
- panic!($err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
- }
- }
- log_and_panic!("We have fallen behind - we have received proof that if we broadcast our counterparty is going to claim all our funds.\n\
- This implies you have restarted with lost ChannelMonitor and ChannelManager state, the first of which is a violation of the LDK chain::Watch requirements.\n\
- More specifically, this means you have a bug in your implementation that can cause loss of funds, or you are running with an old backup, which is unsafe.\n\
- If you have restored from an old backup and wish to force-close channels and return to operation, you should start up, call\n\
- ChannelManager::force_close_without_broadcasting_txn on channel {} with counterparty {} or\n\
- ChannelManager::force_close_all_channels_without_broadcasting_txn, then reconnect to peer(s).\n\
- Note that due to a long-standing bug in lnd you may have to reach out to peers running lnd-based nodes to ask them to manually force-close channels\n\
- See https://github.com/lightningdevkit/rust-lightning/issues/1565 for more info.");
+ let expected_point = self.holder_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.secp_ctx);
+ let given_secret = SecretKey::from_slice(&msg.your_last_per_commitment_secret)
+ .map_err(|_| ChannelError::Close("Peer sent a garbage channel_reestablish with unparseable secret key".to_owned()))?;
+ if expected_point != PublicKey::from_secret_key(&self.secp_ctx, &given_secret) {
+ return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
+ }
+ if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
+ macro_rules! log_and_panic {
+ ($err_msg: expr) => {
+ log_error!(logger, $err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
+ panic!($err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
}
- },
- OptionalField::Absent => {}
+ }
+ log_and_panic!("We have fallen behind - we have received proof that if we broadcast our counterparty is going to claim all our funds.\n\
+ This implies you have restarted with lost ChannelMonitor and ChannelManager state, the first of which is a violation of the LDK chain::Watch requirements.\n\
+ More specifically, this means you have a bug in your implementation that can cause loss of funds, or you are running with an old backup, which is unsafe.\n\
+ If you have restored from an old backup and wish to force-close channels and return to operation, you should start up, call\n\
+ ChannelManager::force_close_without_broadcasting_txn on channel {} with counterparty {} or\n\
+ ChannelManager::force_close_all_channels_without_broadcasting_txn, then reconnect to peer(s).\n\
+ Note that due to a long-standing bug in lnd you may have to reach out to peers running lnd-based nodes to ask them to manually force-close channels\n\
+ See https://github.com/lightningdevkit/rust-lightning/issues/1565 for more info.");
}
}
Some(_) => false,
None => {
assert!(send_shutdown);
- let shutdown_scriptpubkey = signer_provider.get_shutdown_scriptpubkey();
+ let shutdown_scriptpubkey = match signer_provider.get_shutdown_scriptpubkey() {
+ Ok(scriptpubkey) => scriptpubkey,
+ Err(_) => return Err(ChannelError::Close("Failed to get shutdown scriptpubkey".to_owned())),
+ };
if !shutdown_scriptpubkey.is_compatible(their_features) {
return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
}
htlc_basepoint: keys.htlc_basepoint,
first_per_commitment_point,
channel_flags: if self.config.announced_channel {1} else {0},
- shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+ shutdown_scriptpubkey: Some(match &self.shutdown_scriptpubkey {
Some(script) => script.clone().into_inner(),
None => Builder::new().into_script(),
}),
delayed_payment_basepoint: keys.delayed_payment_basepoint,
htlc_basepoint: keys.htlc_basepoint,
first_per_commitment_point,
- shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+ shutdown_scriptpubkey: Some(match &self.shutdown_scriptpubkey {
Some(script) => script.clone().into_inner(),
None => Builder::new().into_script(),
}),
// valid, and valid in fuzzing mode's arbitrary validity criteria:
let mut pk = [2; 33]; pk[1] = 0xff;
let dummy_pubkey = PublicKey::from_slice(&pk).unwrap();
- let data_loss_protect = if self.cur_counterparty_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
+ let remote_last_secret = if self.cur_counterparty_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
let remote_last_secret = self.commitment_secrets.get_secret(self.cur_counterparty_commitment_transaction_number + 2).unwrap();
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()));
- OptionalField::Present(DataLossProtect {
- your_last_per_commitment_secret: remote_last_secret,
- my_current_per_commitment_point: dummy_pubkey
- })
+ remote_last_secret
} else {
log_info!(logger, "Sending a data_loss_protect with no previous remote per_commitment_secret for channel {}", log_bytes!(self.channel_id()));
- OptionalField::Present(DataLossProtect {
- your_last_per_commitment_secret: [0;32],
- my_current_per_commitment_point: dummy_pubkey,
- })
+ [0;32]
};
msgs::ChannelReestablish {
channel_id: self.channel_id(),
// dropped this channel on disconnect as it hasn't yet reached FundingSent so we can't
// overflow here.
next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_counterparty_commitment_transaction_number - 1,
- data_loss_protect,
+ your_last_per_commitment_secret: remote_last_secret,
+ my_current_per_commitment_point: dummy_pubkey,
+ // TODO(dual_funding): If we've sent `commtiment_signed` for an interactive transaction
+ // construction but have not received `tx_signatures` we MUST set `next_funding_txid` to the
+ // txid of that interactive transaction, else we MUST NOT set it.
+ next_funding_txid: None,
}
}
return Err(ChannelError::Ignore("Cannot send 0-msat HTLC".to_owned()));
}
- if amount_msat < self.counterparty_htlc_minimum_msat {
- return Err(ChannelError::Ignore(format!("Cannot send less than their minimum HTLC value ({})", self.counterparty_htlc_minimum_msat)));
+ let available_balances = self.get_available_balances();
+ if amount_msat < available_balances.next_outbound_htlc_minimum_msat {
+ return Err(ChannelError::Ignore(format!("Cannot send less than our next-HTLC minimum - {} msat",
+ available_balances.next_outbound_htlc_minimum_msat)));
+ }
+
+ if amount_msat > available_balances.next_outbound_htlc_limit_msat {
+ return Err(ChannelError::Ignore(format!("Cannot send more than our next-HTLC maximum - {} msat",
+ available_balances.next_outbound_htlc_limit_msat)));
}
if (self.channel_state & (ChannelState::PeerDisconnected as u32)) != 0 {
return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected from channel counterparty".to_owned()));
}
- let inbound_stats = self.get_inbound_pending_htlc_stats(None);
- let outbound_stats = self.get_outbound_pending_htlc_stats(None);
- if outbound_stats.pending_htlcs + 1 > self.counterparty_max_accepted_htlcs as u32 {
- return Err(ChannelError::Ignore(format!("Cannot push more than their max accepted HTLCs ({})", self.counterparty_max_accepted_htlcs)));
- }
- // Check their_max_htlc_value_in_flight_msat
- if outbound_stats.pending_htlcs_value_msat + amount_msat > self.counterparty_max_htlc_value_in_flight_msat {
- 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)));
- }
-
- let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number);
- let commitment_stats = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, true, logger);
- if !self.is_outbound() {
- // Check that we won't violate the remote channel reserve by adding this HTLC.
- let htlc_candidate = HTLCCandidate::new(amount_msat, HTLCInitiator::LocalOffered);
- let counterparty_commit_tx_fee_msat = self.next_remote_commit_tx_fee_msat(htlc_candidate, None);
- let holder_selected_chan_reserve_msat = self.holder_selected_channel_reserve_satoshis * 1000;
- if commitment_stats.remote_balance_msat < counterparty_commit_tx_fee_msat + holder_selected_chan_reserve_msat {
- return Err(ChannelError::Ignore("Cannot send value that would put counterparty balance under holder-announced channel reserve value".to_owned()));
- }
- }
-
- let (htlc_success_dust_limit, htlc_timeout_dust_limit) = if self.opt_anchors() {
- (0, 0)
- } else {
- let dust_buffer_feerate = self.get_dust_buffer_feerate(None) as u64;
- (dust_buffer_feerate * htlc_success_tx_weight(false) / 1000,
- dust_buffer_feerate * htlc_timeout_tx_weight(false) / 1000)
- };
- let exposure_dust_limit_success_sats = htlc_success_dust_limit + self.counterparty_dust_limit_satoshis;
- if amount_msat / 1000 < exposure_dust_limit_success_sats {
- 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;
- if on_counterparty_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
- return Err(ChannelError::Ignore(format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx",
- on_counterparty_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat())));
- }
- }
-
- let exposure_dust_limit_timeout_sats = htlc_timeout_dust_limit + self.holder_dust_limit_satoshis;
- if amount_msat / 1000 < exposure_dust_limit_timeout_sats {
- 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;
- if on_holder_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
- return Err(ChannelError::Ignore(format!("Cannot send value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx",
- on_holder_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat())));
- }
- }
-
- let holder_balance_msat = commitment_stats.local_balance_msat - outbound_stats.holding_cell_msat;
- if holder_balance_msat < amount_msat {
- return Err(ChannelError::Ignore(format!("Cannot send value that would overdraw remaining funds. Amount: {}, pending value to self {}", amount_msat, holder_balance_msat)));
- }
-
- // `2 *` and extra HTLC are for the fee spike buffer.
- let commit_tx_fee_msat = if self.is_outbound() {
- let htlc_candidate = HTLCCandidate::new(amount_msat, HTLCInitiator::LocalOffered);
- FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE * self.next_local_commit_tx_fee_msat(htlc_candidate, Some(()))
- } else { 0 };
- if holder_balance_msat - amount_msat < commit_tx_fee_msat {
- 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)));
- }
+ let need_holding_cell = (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateInProgress as u32)) != 0;
+ log_debug!(logger, "Pushing new outbound HTLC for {} msat {}", amount_msat,
+ if force_holding_cell { "into holding cell" }
+ else if need_holding_cell { "into holding cell as we're awaiting an RAA or monitor" }
+ else { "to peer" });
- // Check self.counterparty_selected_channel_reserve_satoshis (the amount we must keep as
- // reserve for the remote to have something to claim if we misbehave)
- let chan_reserve_msat = self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000;
- if holder_balance_msat - amount_msat - commit_tx_fee_msat < chan_reserve_msat {
- return Err(ChannelError::Ignore(format!("Cannot send value that would put our balance under counterparty-announced channel reserve value ({})", chan_reserve_msat)));
- }
-
- if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateInProgress as u32)) != 0 {
+ if need_holding_cell {
force_holding_cell = true;
}
/// May jump to the channel being fully shutdown (see [`Self::is_shutdown`]) in which case no
/// [`ChannelMonitorUpdate`] will be returned).
pub fn get_shutdown<SP: Deref>(&mut self, signer_provider: &SP, their_features: &InitFeatures,
- target_feerate_sats_per_kw: Option<u32>)
+ target_feerate_sats_per_kw: Option<u32>, override_shutdown_script: Option<ShutdownScript>)
-> Result<(msgs::Shutdown, Option<&ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), APIError>
where SP::Target: SignerProvider {
for htlc in self.pending_outbound_htlcs.iter() {
return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote".to_owned()});
}
}
+ if self.shutdown_scriptpubkey.is_some() && override_shutdown_script.is_some() {
+ return Err(APIError::APIMisuseError{err: "Cannot override shutdown script for a channel with one already set".to_owned()});
+ }
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateInProgress as u32) != 0 {
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()});
let update_shutdown_script = match self.shutdown_scriptpubkey {
Some(_) => false,
None if !chan_closed => {
- let shutdown_scriptpubkey = signer_provider.get_shutdown_scriptpubkey();
+ // use override shutdown script if provided
+ let shutdown_scriptpubkey = match override_shutdown_script {
+ Some(script) => script,
+ None => {
+ // otherwise, use the shutdown scriptpubkey provided by the signer
+ match signer_provider.get_shutdown_scriptpubkey() {
+ Ok(scriptpubkey) => scriptpubkey,
+ Err(_) => return Err(APIError::ChannelUnavailable{err: "Failed to get shutdown scriptpubkey".to_owned()}),
+ }
+ },
+ };
if !shutdown_scriptpubkey.is_compatible(their_features) {
return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
}
use crate::ln::channel::{Channel, InboundHTLCOutput, OutboundHTLCOutput, InboundHTLCState, OutboundHTLCState, HTLCCandidate, HTLCInitiator};
use crate::ln::channel::{MAX_FUNDING_SATOSHIS_NO_WUMBO, TOTAL_BITCOIN_SUPPLY_SATOSHIS, MIN_THEIR_CHAN_RESERVE_SATOSHIS};
use crate::ln::features::ChannelTypeFeatures;
- use crate::ln::msgs::{ChannelUpdate, DataLossProtect, DecodeError, OptionalField, UnsignedChannelUpdate, MAX_VALUE_MSAT};
+ use crate::ln::msgs::{ChannelUpdate, DecodeError, UnsignedChannelUpdate, MAX_VALUE_MSAT};
use crate::ln::script::ShutdownScript;
use crate::ln::chan_utils;
use crate::ln::chan_utils::{htlc_success_tx_weight, htlc_timeout_tx_weight};
use crate::chain::BestBlock;
use crate::chain::chaininterface::{FeeEstimator, LowerBoundedFeeEstimator, ConfirmationTarget};
- use crate::chain::keysinterface::{ChannelSigner, InMemorySigner, EntropySource, SignerProvider};
+ use crate::sign::{ChannelSigner, InMemorySigner, EntropySource, SignerProvider};
use crate::chain::transaction::OutPoint;
use crate::routing::router::Path;
use crate::util::config::UserConfig;
fn read_chan_signer(&self, _data: &[u8]) -> Result<Self::Signer, DecodeError> { panic!(); }
- fn get_destination_script(&self) -> Script {
+ fn get_destination_script(&self) -> Result<Script, ()> {
let secp_ctx = Secp256k1::signing_only();
let channel_monitor_claim_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
let channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
- Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script()
+ Ok(Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script())
}
- fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
+ fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
let secp_ctx = Secp256k1::signing_only();
let channel_close_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
- ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key))
+ Ok(ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key)))
}
}
let msg = node_b_chan.get_channel_reestablish(&&logger);
assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
- match msg.data_loss_protect {
- OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
- assert_eq!(your_last_per_commitment_secret, [0; 32]);
- },
- _ => panic!()
- }
+ assert_eq!(msg.your_last_per_commitment_secret, [0; 32]);
// Check that the commitment point in Node A's channel_reestablish message
// is sane.
let msg = node_a_chan.get_channel_reestablish(&&logger);
assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
- match msg.data_loss_protect {
- OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
- assert_eq!(your_last_per_commitment_secret, [0; 32]);
- },
- _ => panic!()
- }
+ assert_eq!(msg.your_last_per_commitment_secret, [0; 32]);
}
#[test]
use bitcoin::hashes::hex::FromHex;
use bitcoin::hash_types::Txid;
use bitcoin::secp256k1::Message;
- use crate::chain::keysinterface::EcdsaChannelSigner;
+ use crate::sign::EcdsaChannelSigner;
use crate::ln::PaymentPreimage;
use crate::ln::channel::{HTLCOutputInCommitment ,TxCreationKeys};
use crate::ln::chan_utils::{ChannelPublicKeys, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters};
projects / rust-lightning / blobdiff