use bitcoin::blockdata::script::{Script,Builder};
use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
-use bitcoin::blockdata::opcodes;
use bitcoin::util::bip143;
use bitcoin::consensus::encode;
use bitcoin::hashes::Hash;
use bitcoin::hashes::sha256::Hash as Sha256;
use bitcoin::hashes::sha256d::Hash as Sha256d;
-use bitcoin::hash_types::{Txid, BlockHash, WPubkeyHash};
+use bitcoin::hash_types::{Txid, BlockHash};
+use bitcoin::secp256k1::constants::PUBLIC_KEY_SIZE;
use bitcoin::secp256k1::key::{PublicKey,SecretKey};
use bitcoin::secp256k1::{Secp256k1,Signature};
use bitcoin::secp256k1;
use ln::features::{ChannelFeatures, InitFeatures};
use ln::msgs;
use ln::msgs::{DecodeError, OptionalField, DataLossProtect};
-use ln::channelmanager::{BestBlock, PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT};
+use ln::script::ShutdownScript;
+use ln::channelmanager::{PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT};
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};
use ln::chan_utils;
+use chain::BestBlock;
use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, HTLC_FAIL_BACK_BUFFER};
use chain::transaction::{OutPoint, TransactionData};
use util::config::{UserConfig,ChannelConfig};
use util::scid_utils::scid_from_parts;
+use io;
use prelude::*;
use core::{cmp,mem,fmt};
+use core::convert::TryFrom;
use core::ops::Deref;
-#[cfg(any(test, feature = "fuzztarget"))]
-use std::sync::Mutex;
+#[cfg(any(test, feature = "fuzztarget", debug_assertions))]
+use sync::Mutex;
use bitcoin::hashes::hex::ToHex;
-use bitcoin::blockdata::opcodes::all::OP_PUSHBYTES_0;
#[cfg(test)]
pub struct ChannelValueStat {
pub counterparty_dust_limit_msat: u64,
}
+#[derive(Clone, Copy, PartialEq)]
+enum FeeUpdateState {
+ // Inbound states mirroring InboundHTLCState
+ RemoteAnnounced,
+ AwaitingRemoteRevokeToAnnounce,
+ // Note that we do not have a AwaitingAnnouncedRemoteRevoke variant here as it is universally
+ // handled the same as `Committed`, with the only exception in `InboundHTLCState` being the
+ // distinction of when we allow ourselves to forward the HTLC. Because we aren't "forwarding"
+ // the fee update anywhere, we can simply consider the fee update `Committed` immediately
+ // instead of setting it to AwaitingAnnouncedRemoteRevoke.
+
+ // Outbound state can only be `LocalAnnounced` or `Committed`
+ Outbound,
+}
+
enum InboundHTLCRemovalReason {
FailRelay(msgs::OnionErrorPacket),
FailMalformed(([u8; 32], u16)),
/// commitment transaction without it as otherwise we'll have to force-close the channel to
/// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
/// anyway). That said, ChannelMonitor does this for us (see
- /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
- /// local state before then, once we're sure that the next commitment_signed and
+ /// ChannelMonitor::should_broadcast_holder_commitment_txn) so we actually remove the HTLC from
+ /// our own local state before then, once we're sure that the next commitment_signed and
/// ChannelMonitor::provide_latest_local_commitment_tx will not include this HTLC.
LocalRemoved(InboundHTLCRemovalReason),
}
RemoteShutdownSent = 1 << 10,
/// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
/// point, we may not add any new HTLCs to the channel.
- /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
- /// us their shutdown.
LocalShutdownSent = 1 << 11,
/// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
/// to drop us, but we store this anyway.
RemoteOffered,
}
+/// An enum gathering stats on pending HTLCs, either inbound or outbound side.
+struct HTLCStats {
+ pending_htlcs: u32,
+ pending_htlcs_value_msat: u64,
+ on_counterparty_tx_dust_exposure_msat: u64,
+ on_holder_tx_dust_exposure_msat: u64,
+}
+
/// Used when calculating whether we or the remote can afford an additional HTLC.
struct HTLCCandidate {
amount_msat: u64,
}
/// Information needed for constructing an invoice route hint for this channel.
-#[derive(Clone)]
+#[derive(Clone, Debug, PartialEq)]
pub struct CounterpartyForwardingInfo {
/// Base routing fee in millisatoshis.
pub fee_base_msat: u32,
pub cltv_expiry_delta: u16,
}
+/// A return value enum for get_update_fulfill_htlc. See UpdateFulfillCommitFetch variants for
+/// description
+enum UpdateFulfillFetch {
+ NewClaim {
+ monitor_update: ChannelMonitorUpdate,
+ htlc_value_msat: u64,
+ msg: Option<msgs::UpdateFulfillHTLC>,
+ },
+ DuplicateClaim {},
+}
+
+/// The return type of get_update_fulfill_htlc_and_commit.
+pub enum UpdateFulfillCommitFetch {
+ /// Indicates the HTLC fulfill is new, and either generated an update_fulfill message, placed
+ /// it in the holding cell, or re-generated the update_fulfill message after the same claim was
+ /// previously placed in the holding cell (and has since been removed).
+ NewClaim {
+ /// The ChannelMonitorUpdate which places the new payment preimage in the channel monitor
+ monitor_update: ChannelMonitorUpdate,
+ /// The value of the HTLC which was claimed, in msat.
+ htlc_value_msat: u64,
+ /// The update_fulfill message and commitment_signed message (if the claim was not placed
+ /// in the holding cell).
+ msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>,
+ },
+ /// Indicates the HTLC fulfill is duplicative and already existed either in the holding cell
+ /// or has been forgotten (presumably previously claimed).
+ DuplicateClaim {},
+}
+
+/// If the majority of the channels funds are to the fundee and the initiator holds only just
+/// enough funds to cover their reserve value, channels are at risk of getting "stuck". Because the
+/// initiator controls the feerate, if they then go to increase the channel fee, they may have no
+/// balance but the fundee is unable to send a payment as the increase in fee more than drains
+/// their reserve value. Thus, neither side can send a new HTLC and the channel becomes useless.
+/// Thus, before sending an HTLC when we are the initiator, we check that the feerate can increase
+/// by this multiple without hitting this case, before sending.
+/// This multiple is effectively the maximum feerate "jump" we expect until more HTLCs flow over
+/// the channel. Sadly, there isn't really a good number for this - if we expect to have no new
+/// HTLCs for days we may need this to suffice for feerate increases across days, but that may
+/// leave the channel less usable as we hold a bigger reserve.
+#[cfg(fuzzing)]
+pub const FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE: u64 = 2;
+#[cfg(not(fuzzing))]
+const FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE: u64 = 2;
+
// TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
// has been completed, and then turn into a Channel to get compiler-time enforcement of things like
// calling channel_id() before we're set up or things like get_outbound_funding_signed on an
// Holder designates channel data owned for the benefice of the user client.
// Counterparty designates channel data owned by the another channel participant entity.
pub(super) struct Channel<Signer: Sign> {
+ #[cfg(any(test, feature = "_test_utils"))]
+ pub(crate) config: ChannelConfig,
+ #[cfg(not(any(test, feature = "_test_utils")))]
config: ChannelConfig,
user_id: u64,
latest_monitor_update_id: u64,
holder_signer: Signer,
- shutdown_pubkey: PublicKey,
+ shutdown_scriptpubkey: Option<ShutdownScript>,
destination_script: Script,
// Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
// revoke_and_ack is received and new commitment_signed is generated to be
// sent to the funder. Otherwise, the pending value is removed when receiving
// commitment_signed.
- pending_update_fee: Option<u32>,
+ pending_update_fee: Option<(u32, FeeUpdateState)>,
// update_fee() during ChannelState::AwaitingRemoteRevoke is hold in
// holdina_cell_update_fee then moved to pending_udpate_fee when revoke_and_ack
// is received. holding_cell_update_fee is updated when there are additional
#[cfg(debug_assertions)]
/// Max to_local and to_remote outputs in a locally-generated commitment transaction
- holder_max_commitment_tx_output: ::std::sync::Mutex<(u64, u64)>,
+ holder_max_commitment_tx_output: Mutex<(u64, u64)>,
#[cfg(debug_assertions)]
/// Max to_local and to_remote outputs in a remote-generated commitment transaction
- counterparty_max_commitment_tx_output: ::std::sync::Mutex<(u64, u64)>,
+ counterparty_max_commitment_tx_output: Mutex<(u64, u64)>,
+
+ last_sent_closing_fee: Option<(u64, Signature)>, // (fee, holder_sig)
+ target_closing_feerate_sats_per_kw: Option<u32>,
+
+ /// If our counterparty sent us a closing_signed while we were waiting for a `ChannelMonitor`
+ /// update, we need to delay processing it until later. We do that here by simply storing the
+ /// closing_signed message and handling it in `maybe_propose_closing_signed`.
+ pending_counterparty_closing_signed: Option<msgs::ClosingSigned>,
- last_sent_closing_fee: Option<(u32, u64, Signature)>, // (feerate, fee, holder_sig)
+ /// The minimum and maximum absolute fee we are willing to place on the closing transaction.
+ /// These are set once we reach `closing_negotiation_ready`.
+ #[cfg(test)]
+ pub(crate) closing_fee_limits: Option<(u64, u64)>,
+ #[cfg(not(test))]
+ closing_fee_limits: Option<(u64, u64)>,
/// The hash of the block in which the funding transaction was included.
funding_tx_confirmed_in: Option<BlockHash>,
counterparty_max_htlc_value_in_flight_msat: u64,
//get_holder_max_htlc_value_in_flight_msat(): u64,
/// minimum channel reserve for self to maintain - set by them.
- counterparty_selected_channel_reserve_satoshis: u64,
+ counterparty_selected_channel_reserve_satoshis: Option<u64>,
// get_holder_selected_channel_reserve_satoshis(channel_value_sats: u64): u64
counterparty_htlc_minimum_msat: u64,
holder_htlc_minimum_msat: u64,
#[cfg(not(test))]
counterparty_max_accepted_htlcs: u16,
//implied by OUR_MAX_HTLCS: max_accepted_htlcs: u16,
- minimum_depth: u32,
+ minimum_depth: Option<u32>,
counterparty_forwarding_info: Option<CounterpartyForwardingInfo>,
commitment_secrets: CounterpartyCommitmentSecrets,
channel_update_status: ChannelUpdateStatus,
+ /// Once we reach `closing_negotiation_ready`, we set this, indicating if closing_signed does
+ /// not complete within a single timer tick (one minute), we should force-close the channel.
+ /// This prevents us from keeping unusable channels around forever if our counterparty wishes
+ /// to DoS us.
+ /// Note that this field is reset to false on deserialization to give us a chance to connect to
+ /// our peer and start the closing_signed negotiation fresh.
+ closing_signed_in_flight: bool,
/// Our counterparty's channel_announcement signatures provided in announcement_signatures.
/// This can be used to rebroadcast the channel_announcement message later.
next_local_commitment_tx_fee_info_cached: Mutex<Option<CommitmentTxInfoCached>>,
#[cfg(any(test, feature = "fuzztarget"))]
next_remote_commitment_tx_fee_info_cached: Mutex<Option<CommitmentTxInfoCached>>,
+
+ /// lnd has a long-standing bug where, upon reconnection, if the channel is not yet confirmed
+ /// they will not send a channel_reestablish until the channel locks in. Then, they will send a
+ /// funding_locked *before* sending the channel_reestablish (which is clearly a violation of
+ /// the BOLT specs). We copy c-lightning's workaround here and simply store the funding_locked
+ /// message until we receive a channel_reestablish.
+ ///
+ /// See-also <https://github.com/lightningnetwork/lnd/issues/4006>
+ pub workaround_lnd_bug_4006: Option<msgs::FundingLocked>,
+
+ #[cfg(any(test, feature = "fuzztarget"))]
+ // When we receive an HTLC fulfill on an outbound path, we may immediately fulfill the
+ // corresponding HTLC on the inbound path. If, then, the outbound path channel is
+ // disconnected and reconnected (before we've exchange commitment_signed and revoke_and_ack
+ // messages), they may re-broadcast their update_fulfill_htlc, causing a duplicate claim. This
+ // is fine, but as a sanity check in our failure to generate the second claim, we check here
+ // that the original was a claim, and that we aren't now trying to fulfill a failed HTLC.
+ historical_inbound_htlc_fulfills: HashSet<u64>,
}
#[cfg(any(test, feature = "fuzztarget"))]
}
pub const OUR_MAX_HTLCS: u16 = 50; //TODO
-const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
#[cfg(not(test))]
const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
/// channel_id in ChannelManager.
pub(super) enum ChannelError {
Ignore(String),
+ Warn(String),
Close(String),
CloseDelayBroadcast(String),
}
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
&ChannelError::Ignore(ref e) => write!(f, "Ignore : {}", e),
+ &ChannelError::Warn(ref e) => write!(f, "Warn : {}", e),
&ChannelError::Close(ref e) => write!(f, "Close : {}", e),
&ChannelError::CloseDelayBroadcast(ref e) => write!(f, "CloseDelayBroadcast : {}", e)
}
}
// Constructors:
- pub fn new_outbound<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, config: &UserConfig) -> Result<Channel<Signer>, APIError>
+ pub fn new_outbound<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, their_features: &InitFeatures, channel_value_satoshis: u64, push_msat: u64, user_id: u64, config: &UserConfig) -> Result<Channel<Signer>, APIError>
where K::Target: KeysInterface<Signer = Signer>,
F::Target: FeeEstimator,
{
let mut secp_ctx = Secp256k1::new();
secp_ctx.seeded_randomize(&keys_provider.get_secure_random_bytes());
+ let shutdown_scriptpubkey = if config.channel_options.commit_upfront_shutdown_pubkey {
+ Some(keys_provider.get_shutdown_scriptpubkey())
+ } else { None };
+
+ if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
+ if !shutdown_scriptpubkey.is_compatible(&their_features) {
+ return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
+ }
+ }
+
Ok(Channel {
user_id,
config: config.channel_options.clone(),
latest_monitor_update_id: 0,
holder_signer,
- shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
+ shutdown_scriptpubkey,
destination_script: keys_provider.get_destination_script(),
cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
monitor_pending_failures: Vec::new(),
#[cfg(debug_assertions)]
- holder_max_commitment_tx_output: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
+ holder_max_commitment_tx_output: Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
#[cfg(debug_assertions)]
- counterparty_max_commitment_tx_output: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
+ counterparty_max_commitment_tx_output: Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
last_sent_closing_fee: None,
+ pending_counterparty_closing_signed: None,
+ closing_fee_limits: None,
+ target_closing_feerate_sats_per_kw: None,
funding_tx_confirmed_in: None,
funding_tx_confirmation_height: 0,
counterparty_dust_limit_satoshis: 0,
holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS,
counterparty_max_htlc_value_in_flight_msat: 0,
- counterparty_selected_channel_reserve_satoshis: 0,
+ counterparty_selected_channel_reserve_satoshis: None, // Filled in in accept_channel
counterparty_htlc_minimum_msat: 0,
holder_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
counterparty_max_accepted_htlcs: 0,
- minimum_depth: 0, // Filled in in accept_channel
+ minimum_depth: None, // Filled in in accept_channel
counterparty_forwarding_info: None,
commitment_secrets: CounterpartyCommitmentSecrets::new(),
channel_update_status: ChannelUpdateStatus::Enabled,
+ closing_signed_in_flight: false,
announcement_sigs: None,
next_local_commitment_tx_fee_info_cached: Mutex::new(None),
#[cfg(any(test, feature = "fuzztarget"))]
next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
+
+ workaround_lnd_bug_4006: None,
+
+ #[cfg(any(test, feature = "fuzztarget"))]
+ historical_inbound_htlc_fulfills: HashSet::new(),
})
}
if feerate_per_kw < lower_limit {
return Err(ChannelError::Close(format!("Peer's feerate much too low. Actual: {}. Our expected lower limit: {}", feerate_per_kw, lower_limit)));
}
- let upper_limit = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) as u64 * 2;
+ // We only bound the fee updates on the upper side to prevent completely absurd feerates,
+ // always accepting up to 25 sat/vByte or 10x our fee estimator's "High Priority" fee.
+ // We generally don't care too much if they set the feerate to something very high, but it
+ // could result in the channel being useless due to everything being dust.
+ let upper_limit = cmp::max(250 * 25,
+ fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) as u64 * 10);
if feerate_per_kw as u64 > upper_limit {
return Err(ChannelError::Close(format!("Peer's feerate much too high. Actual: {}. Our expected upper limit: {}", feerate_per_kw, upper_limit)));
}
/// Creates a new channel from a remote sides' request for one.
/// Assumes chain_hash has already been checked and corresponds with what we expect!
- pub fn new_from_req<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel, user_id: u64, config: &UserConfig) -> Result<Channel<Signer>, ChannelError>
+ pub fn new_from_req<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, their_features: &InitFeatures, msg: &msgs::OpenChannel, user_id: u64, config: &UserConfig) -> Result<Channel<Signer>, ChannelError>
where K::Target: KeysInterface<Signer = Signer>,
F::Target: FeeEstimator
{
// 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 and has provided a non-accepted scriptpubkey format. Fail the channel
- } else if is_unsupported_shutdown_script(&their_features, script) {
- return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided a non-accepted scriptpubkey format. script: ({})", script.to_bytes().to_hex())));
} else {
- Some(script.clone())
+ match ShutdownScript::try_from((script.clone(), their_features)) {
+ Ok(shutdown_script) => Some(shutdown_script.into_inner()),
+ Err(_) => return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))),
+ }
}
},
// 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
}
} else { None };
+ let shutdown_scriptpubkey = if config.channel_options.commit_upfront_shutdown_pubkey {
+ Some(keys_provider.get_shutdown_scriptpubkey())
+ } else { None };
+
+ if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
+ if !shutdown_scriptpubkey.is_compatible(&their_features) {
+ return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
+ }
+ }
+
let mut secp_ctx = Secp256k1::new();
secp_ctx.seeded_randomize(&keys_provider.get_secure_random_bytes());
latest_monitor_update_id: 0,
holder_signer,
- shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
+ shutdown_scriptpubkey,
destination_script: keys_provider.get_destination_script(),
cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
monitor_pending_failures: Vec::new(),
#[cfg(debug_assertions)]
- holder_max_commitment_tx_output: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
+ holder_max_commitment_tx_output: Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
#[cfg(debug_assertions)]
- counterparty_max_commitment_tx_output: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
+ counterparty_max_commitment_tx_output: Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
last_sent_closing_fee: None,
+ pending_counterparty_closing_signed: None,
+ closing_fee_limits: None,
+ target_closing_feerate_sats_per_kw: None,
funding_tx_confirmed_in: None,
funding_tx_confirmation_height: 0,
counterparty_dust_limit_satoshis: msg.dust_limit_satoshis,
holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS,
counterparty_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
- counterparty_selected_channel_reserve_satoshis: msg.channel_reserve_satoshis,
+ counterparty_selected_channel_reserve_satoshis: Some(msg.channel_reserve_satoshis),
counterparty_htlc_minimum_msat: msg.htlc_minimum_msat,
holder_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
counterparty_max_accepted_htlcs: msg.max_accepted_htlcs,
- minimum_depth: config.own_channel_config.minimum_depth,
+ minimum_depth: Some(config.own_channel_config.minimum_depth),
counterparty_forwarding_info: None,
commitment_secrets: CounterpartyCommitmentSecrets::new(),
channel_update_status: ChannelUpdateStatus::Enabled,
+ closing_signed_in_flight: false,
announcement_sigs: None,
next_local_commitment_tx_fee_info_cached: Mutex::new(None),
#[cfg(any(test, feature = "fuzztarget"))]
next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
+
+ workaround_lnd_bug_4006: None,
+
+ #[cfg(any(test, feature = "fuzztarget"))]
+ historical_inbound_htlc_fulfills: HashSet::new(),
};
Ok(chan)
/// which peer generated this transaction and "to whom" this transaction flows.
/// Returns (the transaction info, the number of HTLC outputs which were present in the
/// transaction, the list of HTLCs which were not ignored when building the transaction).
- /// Note that below-dust HTLCs are included in the third return value, but not the second, and
- /// sources are provided only for outbound HTLCs in the third return value.
+ /// Note that below-dust HTLCs are included in the fourth return value, but not the third, and
+ /// sources are provided only for outbound HTLCs in the fourth return value.
#[inline]
- fn build_commitment_transaction<L: Deref>(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, feerate_per_kw: u32, logger: &L) -> (CommitmentTransaction, usize, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>) where L::Target: Logger {
+ fn build_commitment_transaction<L: Deref>(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, logger: &L) -> (CommitmentTransaction, u32, usize, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>) where L::Target: Logger {
let mut included_dust_htlcs: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::new();
let num_htlcs = self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len();
let mut included_non_dust_htlcs: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::with_capacity(num_htlcs);
let mut local_htlc_total_msat = 0;
let mut value_to_self_msat_offset = 0;
- log_trace!(logger, "Building commitment transaction number {} (really {} xor {}) for {}, generated by {} with fee {}...", commitment_number, (INITIAL_COMMITMENT_NUMBER - commitment_number), get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound()), if local { "us" } else { "remote" }, if generated_by_local { "us" } else { "remote" }, feerate_per_kw);
+ let mut feerate_per_kw = self.feerate_per_kw;
+ if let Some((feerate, update_state)) = self.pending_update_fee {
+ if match update_state {
+ // Note that these match the inclusion criteria when scanning
+ // pending_inbound_htlcs below.
+ FeeUpdateState::RemoteAnnounced => { debug_assert!(!self.is_outbound()); !generated_by_local },
+ FeeUpdateState::AwaitingRemoteRevokeToAnnounce => { debug_assert!(!self.is_outbound()); !generated_by_local },
+ FeeUpdateState::Outbound => { assert!(self.is_outbound()); generated_by_local },
+ } {
+ feerate_per_kw = feerate;
+ }
+ }
+
+ log_trace!(logger, "Building commitment transaction number {} (really {} xor {}) for channel {} for {}, generated by {} with fee {}...",
+ commitment_number, (INITIAL_COMMITMENT_NUMBER - commitment_number),
+ get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound()),
+ log_bytes!(self.channel_id), if local { "us" } else { "remote" }, if generated_by_local { "us" } else { "remote" }, feerate_per_kw);
macro_rules! get_htlc_in_commitment {
($htlc: expr, $offered: expr) => {
} else {
self.counterparty_max_commitment_tx_output.lock().unwrap()
};
- 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 as i64);
+ 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);
broadcaster_max_commitment_tx_output.0 = cmp::max(broadcaster_max_commitment_tx_output.0, value_to_self_msat as u64);
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);
broadcaster_max_commitment_tx_output.1 = cmp::max(broadcaster_max_commitment_tx_output.1, value_to_remote_msat as u64);
htlcs_included.sort_unstable_by_key(|h| h.0.transaction_output_index.unwrap());
htlcs_included.append(&mut included_dust_htlcs);
- (tx, num_nondust_htlcs, htlcs_included)
+ (tx, feerate_per_kw, num_nondust_htlcs, htlcs_included)
}
#[inline]
fn get_closing_scriptpubkey(&self) -> Script {
- let channel_close_key_hash = WPubkeyHash::hash(&self.shutdown_pubkey.serialize());
- Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_close_key_hash[..]).into_script()
+ // The shutdown scriptpubkey is set on channel opening when option_upfront_shutdown_script
+ // is signaled. Otherwise, it is set when sending a shutdown message. Calling this method
+ // outside of those situations will fail.
+ self.shutdown_scriptpubkey.clone().unwrap().into_inner()
}
#[inline]
assert!(self.pending_inbound_htlcs.is_empty());
assert!(self.pending_outbound_htlcs.is_empty());
+ assert!(self.pending_update_fee.is_none());
let mut txouts: Vec<(TxOut, ())> = Vec::new();
let mut total_fee_satoshis = proposed_total_fee_satoshis;
}, ()));
}
+ assert!(self.shutdown_scriptpubkey.is_some());
if value_to_self as u64 > self.holder_dust_limit_satoshis {
txouts.push((TxOut {
script_pubkey: self.get_closing_scriptpubkey(),
make_funding_redeemscript(&self.get_holder_pubkeys().funding_pubkey, self.counterparty_funding_pubkey())
}
- /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
- /// @local is used only to convert relevant internal structures which refer to remote vs local
- /// to decide value of outputs and direction of HTLCs.
- fn build_htlc_transaction(&self, prev_hash: &Txid, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys, feerate_per_kw: u32) -> Transaction {
- chan_utils::build_htlc_transaction(prev_hash, feerate_per_kw, if local { self.get_counterparty_selected_contest_delay() } else { self.get_holder_selected_contest_delay() }, htlc, &keys.broadcaster_delayed_payment_key, &keys.revocation_key)
- }
-
- /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
- /// In such cases we debug_assert!(false) and return a ChannelError::Ignore. Thus, will always
- /// return Ok(_) if debug assertions are turned on or preconditions are met.
- ///
- /// Note that it is still possible to hit these assertions in case we find a preimage on-chain
- /// but then have a reorg which settles on an HTLC-failure on chain.
- fn get_update_fulfill_htlc<L: Deref>(&mut self, htlc_id_arg: u64, payment_preimage_arg: PaymentPreimage, logger: &L) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitorUpdate>), ChannelError> where L::Target: Logger {
+ fn get_update_fulfill_htlc<L: Deref>(&mut self, htlc_id_arg: u64, payment_preimage_arg: PaymentPreimage, logger: &L) -> UpdateFulfillFetch where L::Target: Logger {
// Either ChannelFunded got set (which means it won't be unset) or there is no way any
// caller thought we could have something claimed (cause we wouldn't have accepted in an
// incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
// these, but for now we just have to treat them as normal.
let mut pending_idx = core::usize::MAX;
+ let mut htlc_value_msat = 0;
for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
if htlc.htlc_id == htlc_id_arg {
assert_eq!(htlc.payment_hash, payment_hash_calc);
if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
} else {
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()));
+ debug_assert!(false, "Tried to fulfill an HTLC that was already failed");
}
- debug_assert!(false, "Tried to fulfill an HTLC that was already fail/fulfilled");
- return Ok((None, None));
+ return UpdateFulfillFetch::DuplicateClaim {};
},
_ => {
debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
}
}
pending_idx = idx;
+ htlc_value_msat = htlc.amount_msat;
break;
}
}
if pending_idx == core::usize::MAX {
- return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
+ #[cfg(any(test, feature = "fuzztarget"))]
+ // If we failed to find an HTLC to fulfill, make sure it was previously fulfilled and
+ // this is simply a duplicate claim, not previously failed and we lost funds.
+ debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
+ return UpdateFulfillFetch::DuplicateClaim {};
}
// Now update local state:
if htlc_id_arg == htlc_id {
// Make sure we don't leave latest_monitor_update_id incremented here:
self.latest_monitor_update_id -= 1;
- debug_assert!(false, "Tried to fulfill an HTLC that was already fulfilled");
- return Ok((None, None));
+ #[cfg(any(test, feature = "fuzztarget"))]
+ debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
+ return UpdateFulfillFetch::DuplicateClaim {};
}
},
&HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
// TODO: We may actually be able to switch to a fulfill here, though its
// rare enough it may not be worth the complexity burden.
debug_assert!(false, "Tried to fulfill an HTLC that was already failed");
- return Ok((None, Some(monitor_update)));
+ return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
}
},
_ => {}
}
}
- log_trace!(logger, "Adding HTLC claim to holding_cell! Current state: {}", self.channel_state);
+ log_trace!(logger, "Adding HTLC claim to holding_cell in channel {}! Current state: {}", log_bytes!(self.channel_id()), self.channel_state);
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
});
- return Ok((None, Some(monitor_update)));
+ #[cfg(any(test, feature = "fuzztarget"))]
+ self.historical_inbound_htlc_fulfills.insert(htlc_id_arg);
+ return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
}
+ #[cfg(any(test, feature = "fuzztarget"))]
+ self.historical_inbound_htlc_fulfills.insert(htlc_id_arg);
{
let htlc = &mut self.pending_inbound_htlcs[pending_idx];
if let InboundHTLCState::Committed = htlc.state {
} else {
debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
- return Ok((None, Some(monitor_update)));
+ return UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None };
}
- log_trace!(logger, "Upgrading HTLC {} to LocalRemoved with a Fulfill!", log_bytes!(htlc.payment_hash.0));
+ log_trace!(logger, "Upgrading HTLC {} to LocalRemoved with a Fulfill in channel {}!", log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(payment_preimage_arg.clone()));
}
- Ok((Some(msgs::UpdateFulfillHTLC {
- channel_id: self.channel_id(),
- htlc_id: htlc_id_arg,
- payment_preimage: payment_preimage_arg,
- }), Some(monitor_update)))
+ UpdateFulfillFetch::NewClaim {
+ monitor_update,
+ htlc_value_msat,
+ msg: Some(msgs::UpdateFulfillHTLC {
+ channel_id: self.channel_id(),
+ htlc_id: htlc_id_arg,
+ payment_preimage: payment_preimage_arg,
+ }),
+ }
}
- pub fn get_update_fulfill_htlc_and_commit<L: Deref>(&mut self, htlc_id: u64, payment_preimage: PaymentPreimage, logger: &L) -> Result<(Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, Option<ChannelMonitorUpdate>), ChannelError> where L::Target: Logger {
- match self.get_update_fulfill_htlc(htlc_id, payment_preimage, logger)? {
- (Some(update_fulfill_htlc), Some(mut monitor_update)) => {
- let (commitment, mut additional_update) = self.send_commitment_no_status_check(logger)?;
+ 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 {
+ match self.get_update_fulfill_htlc(htlc_id, payment_preimage, logger) {
+ UpdateFulfillFetch::NewClaim { mut monitor_update, htlc_value_msat, msg: Some(update_fulfill_htlc) } => {
+ let (commitment, mut additional_update) = match self.send_commitment_no_status_check(logger) {
+ Err(e) => return Err((e, monitor_update)),
+ Ok(res) => res
+ };
// send_commitment_no_status_check may bump latest_monitor_id but we want them to be
// strictly increasing by one, so decrement it here.
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
- Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
- },
- (Some(update_fulfill_htlc), None) => {
- let (commitment, monitor_update) = self.send_commitment_no_status_check(logger)?;
- Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
+ Ok(UpdateFulfillCommitFetch::NewClaim { monitor_update, htlc_value_msat, msgs: Some((update_fulfill_htlc, commitment)) })
},
- (None, Some(monitor_update)) => Ok((None, Some(monitor_update))),
- (None, None) => Ok((None, None))
+ UpdateFulfillFetch::NewClaim { monitor_update, htlc_value_msat, msg: None } =>
+ Ok(UpdateFulfillCommitFetch::NewClaim { monitor_update, htlc_value_msat, msgs: None }),
+ UpdateFulfillFetch::DuplicateClaim {} => Ok(UpdateFulfillCommitFetch::DuplicateClaim {}),
}
}
- /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
- /// In such cases we debug_assert!(false) and return a ChannelError::Ignore. Thus, will always
- /// return Ok(_) if debug assertions are turned on or preconditions are met.
- ///
- /// Note that it is still possible to hit these assertions in case we find a preimage on-chain
- /// but then have a reorg which settles on an HTLC-failure on chain.
+ /// We can only have one resolution per HTLC. In some cases around reconnect, we may fulfill
+ /// an HTLC more than once or fulfill once and then attempt to fail after reconnect. We cannot,
+ /// however, fail more than once as we wait for an upstream failure to be irrevocably committed
+ /// before we fail backwards.
+ /// If we do fail twice, we debug_assert!(false) and return Ok(None). Thus, will always return
+ /// Ok(_) if debug assertions are turned on or preconditions are met.
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 {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
panic!("Was asked to fail an HTLC when channel was not in an operational state");
if htlc.htlc_id == htlc_id_arg {
match htlc.state {
InboundHTLCState::Committed => {},
- InboundHTLCState::LocalRemoved(_) => {
- debug_assert!(false, "Tried to fail an HTLC that was already fail/fulfilled");
+ InboundHTLCState::LocalRemoved(ref reason) => {
+ if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
+ } else {
+ debug_assert!(false, "Tried to fail an HTLC that was already failed");
+ }
return Ok(None);
},
_ => {
}
}
if pending_idx == core::usize::MAX {
- return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
+ #[cfg(any(test, feature = "fuzztarget"))]
+ // If we failed to find an HTLC to fail, make sure it was previously fulfilled and this
+ // is simply a duplicate fail, not previously failed and we failed-back too early.
+ debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
+ return Ok(None);
}
// Now update local state:
match pending_update {
&HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
if htlc_id_arg == htlc_id {
- debug_assert!(false, "Tried to fail an HTLC that was already fulfilled");
- return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID".to_owned()));
+ #[cfg(any(test, feature = "fuzztarget"))]
+ debug_assert!(self.historical_inbound_htlc_fulfills.contains(&htlc_id_arg));
+ return Ok(None);
}
},
&HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
_ => {}
}
}
- log_trace!(logger, "Placing failure for HTLC ID {} in holding cell", htlc_id_arg);
+ log_trace!(logger, "Placing failure for HTLC ID {} in holding cell in channel {}.", htlc_id_arg, log_bytes!(self.channel_id()));
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
htlc_id: htlc_id_arg,
err_packet,
return Ok(None);
}
- log_trace!(logger, "Failing HTLC ID {} back with a update_fail_htlc message", htlc_id_arg);
+ log_trace!(logger, "Failing HTLC ID {} back with a update_fail_htlc message in channel {}.", htlc_id_arg, log_bytes!(self.channel_id()));
{
let htlc = &mut self.pending_inbound_htlcs[pending_idx];
htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(err_packet.clone()));
// Message handlers:
- pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel, config: &UserConfig, their_features: InitFeatures) -> Result<(), ChannelError> {
+ pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel, config: &UserConfig, their_features: &InitFeatures) -> Result<(), ChannelError> {
// Check sanity of message fields:
if !self.is_outbound() {
return Err(ChannelError::Close("Got an accept_channel message from an inbound peer".to_owned()));
if msg.channel_reserve_satoshis > self.channel_value_satoshis {
return Err(ChannelError::Close(format!("Bogus channel_reserve_satoshis ({}). Must not be greater than ({})", msg.channel_reserve_satoshis, self.channel_value_satoshis)));
}
- if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
- return Err(ChannelError::Close(format!("Bogus channel_reserve ({}) and dust_limit ({})", msg.channel_reserve_satoshis, msg.dust_limit_satoshis)));
- }
if msg.channel_reserve_satoshis < self.holder_dust_limit_satoshis {
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)));
}
if msg.minimum_depth > config.peer_channel_config_limits.max_minimum_depth {
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)));
}
+ if msg.minimum_depth == 0 {
+ // Note that if this changes we should update the serialization minimum version to
+ // indicate to older clients that they don't understand some features of the current
+ // channel.
+ return Err(ChannelError::Close("Minimum confirmation depth must be at least 1".to_owned()));
+ }
let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
match &msg.shutdown_scriptpubkey {
// 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 and has provided a non-accepted scriptpubkey format. Fail the channel
- } else if is_unsupported_shutdown_script(&their_features, script) {
- return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided a non-accepted scriptpubkey format. script: ({})", script.to_bytes().to_hex())));
} else {
- Some(script.clone())
+ match ShutdownScript::try_from((script.clone(), their_features)) {
+ Ok(shutdown_script) => Some(shutdown_script.into_inner()),
+ Err(_) => return Err(ChannelError::Close(format!("Peer is signaling upfront_shutdown but has provided an unacceptable scriptpubkey format: {}", script))),
+ }
}
},
// 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
self.counterparty_dust_limit_satoshis = msg.dust_limit_satoshis;
self.counterparty_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
- self.counterparty_selected_channel_reserve_satoshis = msg.channel_reserve_satoshis;
+ self.counterparty_selected_channel_reserve_satoshis = Some(msg.channel_reserve_satoshis);
self.counterparty_htlc_minimum_msat = msg.htlc_minimum_msat;
self.counterparty_max_accepted_htlcs = msg.max_accepted_htlcs;
- self.minimum_depth = msg.minimum_depth;
+ self.minimum_depth = Some(msg.minimum_depth);
let counterparty_pubkeys = ChannelPublicKeys {
funding_pubkey: msg.funding_pubkey,
let funding_script = self.get_funding_redeemscript();
let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number)?;
- let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, self.feerate_per_kw, logger).0;
+ let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, logger).0;
{
let trusted_tx = initial_commitment_tx.trust();
let initial_commitment_bitcoin_tx = trusted_tx.built_transaction();
let sighash = initial_commitment_bitcoin_tx.get_sighash_all(&funding_script, self.channel_value_satoshis);
// They sign the holder commitment transaction...
- log_trace!(logger, "Checking funding_created tx signature {} by key {} against tx {} (sighash {}) with redeemscript {}", log_bytes!(sig.serialize_compact()[..]), log_bytes!(self.counterparty_funding_pubkey().serialize()), encode::serialize_hex(&initial_commitment_bitcoin_tx.transaction), log_bytes!(sighash[..]), encode::serialize_hex(&funding_script));
+ log_trace!(logger, "Checking funding_created tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} for channel {}.",
+ log_bytes!(sig.serialize_compact()[..]), log_bytes!(self.counterparty_funding_pubkey().serialize()),
+ encode::serialize_hex(&initial_commitment_bitcoin_tx.transaction), log_bytes!(sighash[..]),
+ encode::serialize_hex(&funding_script), log_bytes!(self.channel_id()));
secp_check!(self.secp_ctx.verify(&sighash, &sig, self.counterparty_funding_pubkey()), "Invalid funding_created signature from peer".to_owned());
}
let counterparty_keys = self.build_remote_transaction_keys()?;
- let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, self.feerate_per_kw, logger).0;
+ let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).0;
let counterparty_trusted_tx = counterparty_initial_commitment_tx.trust();
let counterparty_initial_bitcoin_tx = counterparty_trusted_tx.built_transaction();
- log_trace!(logger, "Initial counterparty ID {} tx {}", counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
+ log_trace!(logger, "Initial counterparty tx for channel {} is: txid {} tx {}",
+ log_bytes!(self.channel_id()), counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
let counterparty_signature = self.holder_signer.sign_counterparty_commitment(&counterparty_initial_commitment_tx, &self.secp_ctx)
.map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed".to_owned()))?.0;
self.counterparty_funding_pubkey()
);
+ self.holder_signer.validate_holder_commitment(&holder_commitment_tx);
+
// Now that we're past error-generating stuff, update our local state:
let funding_redeemscript = self.get_funding_redeemscript();
let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
let obscure_factor = get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound());
+ let shutdown_script = self.shutdown_scriptpubkey.clone().map(|script| script.into_inner());
let channel_monitor = ChannelMonitor::new(self.secp_ctx.clone(), self.holder_signer.clone(),
- &self.shutdown_pubkey, self.get_holder_selected_contest_delay(),
+ shutdown_script, self.get_holder_selected_contest_delay(),
&self.destination_script, (funding_txo, funding_txo_script.clone()),
&self.channel_transaction_parameters,
funding_redeemscript.clone(), self.channel_value_satoshis,
self.cur_counterparty_commitment_transaction_number -= 1;
self.cur_holder_commitment_transaction_number -= 1;
+ log_info!(logger, "Generated funding_signed for peer for channel {}", log_bytes!(self.channel_id()));
+
Ok((msgs::FundingSigned {
channel_id: self.channel_id,
signature
let funding_script = self.get_funding_redeemscript();
let counterparty_keys = self.build_remote_transaction_keys()?;
- let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, self.feerate_per_kw, logger).0;
+ let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).0;
let counterparty_trusted_tx = counterparty_initial_commitment_tx.trust();
let counterparty_initial_bitcoin_tx = counterparty_trusted_tx.built_transaction();
- log_trace!(logger, "Initial counterparty ID {} tx {}", counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
+ log_trace!(logger, "Initial counterparty tx for channel {} is: txid {} tx {}",
+ log_bytes!(self.channel_id()), counterparty_initial_bitcoin_tx.txid, encode::serialize_hex(&counterparty_initial_bitcoin_tx.transaction));
let holder_signer = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number)?;
- let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &holder_signer, true, false, self.feerate_per_kw, logger).0;
+ let initial_commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &holder_signer, true, false, logger).0;
{
let trusted_tx = initial_commitment_tx.trust();
let initial_commitment_bitcoin_tx = trusted_tx.built_transaction();
self.counterparty_funding_pubkey()
);
+ self.holder_signer.validate_holder_commitment(&holder_commitment_tx);
let funding_redeemscript = self.get_funding_redeemscript();
let funding_txo = self.get_funding_txo().unwrap();
let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
let obscure_factor = get_commitment_transaction_number_obscure_factor(&self.get_holder_pubkeys().payment_point, &self.get_counterparty_pubkeys().payment_point, self.is_outbound());
+ let shutdown_script = self.shutdown_scriptpubkey.clone().map(|script| script.into_inner());
let channel_monitor = ChannelMonitor::new(self.secp_ctx.clone(), self.holder_signer.clone(),
- &self.shutdown_pubkey, self.get_holder_selected_contest_delay(),
+ shutdown_script, self.get_holder_selected_contest_delay(),
&self.destination_script, (funding_txo, funding_txo_script),
&self.channel_transaction_parameters,
funding_redeemscript.clone(), self.channel_value_satoshis,
self.cur_holder_commitment_transaction_number -= 1;
self.cur_counterparty_commitment_transaction_number -= 1;
+ log_info!(logger, "Received funding_signed from peer for channel {}", log_bytes!(self.channel_id()));
+
Ok((channel_monitor, self.funding_transaction.as_ref().cloned().unwrap()))
}
- pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), ChannelError> {
+ pub fn funding_locked<L: Deref>(&mut self, msg: &msgs::FundingLocked, logger: &L) -> Result<(), ChannelError> where L::Target: Logger {
if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
- return Err(ChannelError::Close("Peer sent funding_locked when we needed a channel_reestablish".to_owned()));
+ self.workaround_lnd_bug_4006 = Some(msg.clone());
+ 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()));
}
let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
self.counterparty_prev_commitment_point = self.counterparty_cur_commitment_point;
self.counterparty_cur_commitment_point = Some(msg.next_per_commitment_point);
+
+ log_info!(logger, "Received funding_locked from peer for channel {}", log_bytes!(self.channel_id()));
+
Ok(())
}
- /// Returns (inbound_htlc_count, htlc_inbound_value_msat)
- fn get_inbound_pending_htlc_stats(&self) -> (u32, u64) {
- let mut htlc_inbound_value_msat = 0;
+ /// Returns a HTLCStats about inbound pending htlcs
+ fn get_inbound_pending_htlc_stats(&self) -> HTLCStats {
+ let mut stats = HTLCStats {
+ pending_htlcs: self.pending_inbound_htlcs.len() as u32,
+ pending_htlcs_value_msat: 0,
+ on_counterparty_tx_dust_exposure_msat: 0,
+ on_holder_tx_dust_exposure_msat: 0,
+ };
+
+ let counterparty_dust_limit_timeout_sat = (self.get_dust_buffer_feerate() as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
+ let holder_dust_limit_success_sat = (self.get_dust_buffer_feerate() as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
for ref htlc in self.pending_inbound_htlcs.iter() {
- htlc_inbound_value_msat += htlc.amount_msat;
+ stats.pending_htlcs_value_msat += htlc.amount_msat;
+ if htlc.amount_msat / 1000 < counterparty_dust_limit_timeout_sat {
+ stats.on_counterparty_tx_dust_exposure_msat += htlc.amount_msat;
+ }
+ if htlc.amount_msat / 1000 < holder_dust_limit_success_sat {
+ stats.on_holder_tx_dust_exposure_msat += htlc.amount_msat;
+ }
}
- (self.pending_inbound_htlcs.len() as u32, htlc_inbound_value_msat)
+ stats
}
- /// Returns (outbound_htlc_count, htlc_outbound_value_msat) *including* pending adds in our
- /// holding cell.
- fn get_outbound_pending_htlc_stats(&self) -> (u32, u64) {
- let mut htlc_outbound_value_msat = 0;
+ /// Returns a HTLCStats about pending outbound htlcs, *including* pending adds in our holding cell.
+ fn get_outbound_pending_htlc_stats(&self) -> HTLCStats {
+ let mut stats = HTLCStats {
+ pending_htlcs: self.pending_outbound_htlcs.len() as u32,
+ pending_htlcs_value_msat: 0,
+ on_counterparty_tx_dust_exposure_msat: 0,
+ on_holder_tx_dust_exposure_msat: 0,
+ };
+
+ let counterparty_dust_limit_success_sat = (self.get_dust_buffer_feerate() as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
+ let holder_dust_limit_timeout_sat = (self.get_dust_buffer_feerate() as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
for ref htlc in self.pending_outbound_htlcs.iter() {
- htlc_outbound_value_msat += htlc.amount_msat;
+ stats.pending_htlcs_value_msat += htlc.amount_msat;
+ if htlc.amount_msat / 1000 < counterparty_dust_limit_success_sat {
+ stats.on_counterparty_tx_dust_exposure_msat += htlc.amount_msat;
+ }
+ if htlc.amount_msat / 1000 < holder_dust_limit_timeout_sat {
+ stats.on_holder_tx_dust_exposure_msat += htlc.amount_msat;
+ }
}
- let mut htlc_outbound_count = self.pending_outbound_htlcs.len();
for update in self.holding_cell_htlc_updates.iter() {
if let &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, .. } = update {
- htlc_outbound_count += 1;
- htlc_outbound_value_msat += amount_msat;
+ stats.pending_htlcs += 1;
+ stats.pending_htlcs_value_msat += amount_msat;
+ if *amount_msat / 1000 < counterparty_dust_limit_success_sat {
+ stats.on_counterparty_tx_dust_exposure_msat += amount_msat;
+ }
+ if *amount_msat / 1000 < holder_dust_limit_timeout_sat {
+ stats.on_holder_tx_dust_exposure_msat += amount_msat;
+ }
}
}
-
- (htlc_outbound_count as u32, htlc_outbound_value_msat)
+ stats
}
/// Get the available (ie not including pending HTLCs) inbound and outbound balance in msat.
/// corner case properly.
pub fn get_inbound_outbound_available_balance_msat(&self) -> (u64, u64) {
// Note that we have to handle overflow due to the above case.
- (cmp::max(self.channel_value_satoshis as i64 * 1000 - self.value_to_self_msat as i64 - self.get_inbound_pending_htlc_stats().1 as i64, 0) as u64,
- cmp::max(self.value_to_self_msat as i64 - self.get_outbound_pending_htlc_stats().1 as i64, 0) as u64)
+ (
+ cmp::max(self.channel_value_satoshis as i64 * 1000
+ - self.value_to_self_msat as i64
+ - self.get_inbound_pending_htlc_stats().pending_htlcs_value_msat as i64
+ - Self::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) as i64 * 1000,
+ 0) as u64,
+ cmp::max(self.value_to_self_msat as i64
+ - self.get_outbound_pending_htlc_stats().pending_htlcs_value_msat as i64
+ - self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0) as i64 * 1000,
+ 0) as u64
+ )
+ }
+
+ pub fn get_holder_counterparty_selected_channel_reserve_satoshis(&self) -> (u64, Option<u64>) {
+ (Self::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis),
+ self.counterparty_selected_channel_reserve_satoshis)
}
// Get the fee cost of a commitment tx with a given number of HTLC outputs.
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)));
}
- let (inbound_htlc_count, htlc_inbound_value_msat) = self.get_inbound_pending_htlc_stats();
- if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
+ let inbound_stats = self.get_inbound_pending_htlc_stats();
+ let outbound_stats = self.get_outbound_pending_htlc_stats();
+ if inbound_stats.pending_htlcs + 1 > OUR_MAX_HTLCS as u32 {
return Err(ChannelError::Close(format!("Remote tried to push more than our max accepted HTLCs ({})", OUR_MAX_HTLCS)));
}
let holder_max_htlc_value_in_flight_msat = Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis);
- if htlc_inbound_value_msat + msg.amount_msat > holder_max_htlc_value_in_flight_msat {
+ if inbound_stats.pending_htlcs_value_msat + msg.amount_msat > holder_max_htlc_value_in_flight_msat {
return Err(ChannelError::Close(format!("Remote HTLC add would put them over our max HTLC value ({})", holder_max_htlc_value_in_flight_msat)));
}
// Check holder_selected_channel_reserve_satoshis (we're getting paid, so they have to at least meet
}
}
+ let exposure_dust_limit_timeout_sats = (self.get_dust_buffer_feerate() as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + self.counterparty_dust_limit_satoshis;
+ if msg.amount_msat / 1000 < exposure_dust_limit_timeout_sats {
+ 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;
+ if on_counterparty_tx_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
+ log_info!(logger, "Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on counterparty commitment tx",
+ on_counterparty_tx_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat());
+ pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
+ }
+ }
+
+ let exposure_dust_limit_success_sats = (self.get_dust_buffer_feerate() as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + self.holder_dust_limit_satoshis;
+ if msg.amount_msat / 1000 < exposure_dust_limit_success_sats {
+ 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;
+ if on_holder_tx_dust_htlc_exposure_msat > self.get_max_dust_htlc_exposure_msat() {
+ log_info!(logger, "Cannot accept value that would put our exposure to dust HTLCs at {} over the limit {} on holder commitment tx",
+ on_holder_tx_dust_htlc_exposure_msat, self.get_max_dust_htlc_exposure_msat());
+ pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
+ }
+ }
+
let pending_value_to_self_msat =
- self.value_to_self_msat + htlc_inbound_value_msat - removed_outbound_total_msat;
+ self.value_to_self_msat + inbound_stats.pending_htlcs_value_msat - removed_outbound_total_msat;
let pending_remote_value_msat =
self.channel_value_satoshis * 1000 - pending_value_to_self_msat;
if pending_remote_value_msat < msg.amount_msat {
if pending_remote_value_msat - msg.amount_msat - chan_reserve_msat < remote_fee_cost_incl_stuck_buffer_msat {
// Note that if the pending_forward_status is not updated here, then it's because we're already failing
// the HTLC, i.e. its status is already set to failing.
- log_info!(logger, "Attempting to fail HTLC due to fee spike buffer violation");
+ log_info!(logger, "Attempting to fail HTLC due to fee spike buffer violation in channel {}. Rebalancing is required.", log_bytes!(self.channel_id()));
pending_forward_status = create_pending_htlc_status(self, pending_forward_status, 0x1000|7);
}
} else {
// Check that they won't violate our local required channel reserve by adding this HTLC.
let htlc_candidate = HTLCCandidate::new(msg.amount_msat, HTLCInitiator::RemoteOffered);
let local_commit_tx_fee_msat = self.next_local_commit_tx_fee_msat(htlc_candidate, None);
- if self.value_to_self_msat < self.counterparty_selected_channel_reserve_satoshis * 1000 + local_commit_tx_fee_msat {
+ if self.value_to_self_msat < self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000 + local_commit_tx_fee_msat {
return Err(ChannelError::Close("Cannot accept HTLC that would put our balance under counterparty-announced channel reserve value".to_owned()));
}
}
/// Marks an outbound HTLC which we have received update_fail/fulfill/malformed
#[inline]
- fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<PaymentHash>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, ChannelError> {
+ fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<PaymentHash>, fail_reason: Option<HTLCFailReason>) -> Result<&OutboundHTLCOutput, ChannelError> {
for htlc in self.pending_outbound_htlcs.iter_mut() {
if htlc.htlc_id == htlc_id {
match check_preimage {
OutboundHTLCState::AwaitingRemoteRevokeToRemove(_) | OutboundHTLCState::AwaitingRemovedRemoteRevoke(_) | OutboundHTLCState::RemoteRemoved(_) =>
return Err(ChannelError::Close(format!("Remote tried to fulfill/fail HTLC ({}) that they'd already fulfilled/failed", htlc_id))),
}
- return Ok(&htlc.source);
+ return Ok(htlc);
}
}
Err(ChannelError::Close("Remote tried to fulfill/fail an HTLC we couldn't find".to_owned()))
}
- pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<HTLCSource, ChannelError> {
+ pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<(HTLCSource, u64), ChannelError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(ChannelError::Close("Got fulfill HTLC message when channel was not in an operational state".to_owned()));
}
}
let payment_hash = PaymentHash(Sha256::hash(&msg.payment_preimage.0[..]).into_inner());
- self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None).map(|source| source.clone())
+ self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None).map(|htlc| (htlc.source.clone(), htlc.amount_msat))
}
pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
Ok(())
}
- pub fn commitment_signed<F: Deref, L: Deref>(&mut self, msg: &msgs::CommitmentSigned, fee_estimator: &F, logger: &L) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, Option<msgs::ClosingSigned>, ChannelMonitorUpdate), (Option<ChannelMonitorUpdate>, ChannelError)>
- where F::Target: FeeEstimator,
- L::Target: Logger
+ pub fn commitment_signed<L: Deref>(&mut self, msg: &msgs::CommitmentSigned, logger: &L) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitorUpdate), (Option<ChannelMonitorUpdate>, ChannelError)>
+ where L::Target: Logger
{
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err((None, ChannelError::Close("Got commitment signed message when channel was not in an operational state".to_owned())));
let keys = self.build_holder_transaction_keys(self.cur_holder_commitment_transaction_number).map_err(|e| (None, e))?;
- let mut update_fee = false;
- let feerate_per_kw = if !self.is_outbound() && self.pending_update_fee.is_some() {
- update_fee = true;
- self.pending_update_fee.unwrap()
- } else {
- self.feerate_per_kw
- };
-
- let (num_htlcs, mut htlcs_cloned, commitment_tx, commitment_txid) = {
- let commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, feerate_per_kw, logger);
+ let (num_htlcs, mut htlcs_cloned, commitment_tx, commitment_txid, feerate_per_kw) = {
+ let commitment_tx = self.build_commitment_transaction(self.cur_holder_commitment_transaction_number, &keys, true, false, logger);
let commitment_txid = {
let trusted_tx = commitment_tx.0.trust();
let bitcoin_tx = trusted_tx.built_transaction();
let sighash = bitcoin_tx.get_sighash_all(&funding_script, self.channel_value_satoshis);
- log_trace!(logger, "Checking commitment tx signature {} by key {} against tx {} (sighash {}) with redeemscript {}", log_bytes!(msg.signature.serialize_compact()[..]), log_bytes!(self.counterparty_funding_pubkey().serialize()), encode::serialize_hex(&bitcoin_tx.transaction), log_bytes!(sighash[..]), encode::serialize_hex(&funding_script));
+ log_trace!(logger, "Checking commitment tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} in channel {}",
+ log_bytes!(msg.signature.serialize_compact()[..]),
+ log_bytes!(self.counterparty_funding_pubkey().serialize()), encode::serialize_hex(&bitcoin_tx.transaction),
+ log_bytes!(sighash[..]), encode::serialize_hex(&funding_script), log_bytes!(self.channel_id()));
if let Err(_) = self.secp_ctx.verify(&sighash, &msg.signature, &self.counterparty_funding_pubkey()) {
return Err((None, ChannelError::Close("Invalid commitment tx signature from peer".to_owned())));
}
bitcoin_tx.txid
};
- let htlcs_cloned: Vec<_> = commitment_tx.2.iter().map(|htlc| (htlc.0.clone(), htlc.1.map(|h| h.clone()))).collect();
- (commitment_tx.1, htlcs_cloned, commitment_tx.0, commitment_txid)
+ let htlcs_cloned: Vec<_> = commitment_tx.3.iter().map(|htlc| (htlc.0.clone(), htlc.1.map(|h| h.clone()))).collect();
+ (commitment_tx.2, htlcs_cloned, commitment_tx.0, commitment_txid, commitment_tx.1)
};
+ // If our counterparty updated the channel fee in this commitment transaction, check that
+ // they can actually afford the new fee now.
+ let update_fee = if let Some((_, update_state)) = self.pending_update_fee {
+ update_state == FeeUpdateState::RemoteAnnounced
+ } else { false };
+ if update_fee { debug_assert!(!self.is_outbound()); }
let total_fee = feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT + (num_htlcs as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
- //If channel fee was updated by funder confirm funder can afford the new fee rate when applied to the current local commitment transaction
if update_fee {
let counterparty_reserve_we_require = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis);
if self.channel_value_satoshis - self.value_to_self_msat / 1000 < total_fee + counterparty_reserve_we_require {
let mut htlcs_and_sigs = Vec::with_capacity(htlcs_cloned.len());
for (idx, (htlc, source)) in htlcs_cloned.drain(..).enumerate() {
if let Some(_) = htlc.transaction_output_index {
- let htlc_tx = self.build_htlc_transaction(&commitment_txid, &htlc, true, &keys, feerate_per_kw);
+ let htlc_tx = chan_utils::build_htlc_transaction(&commitment_txid, feerate_per_kw,
+ self.get_counterparty_selected_contest_delay().unwrap(), &htlc,
+ &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
+
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
let htlc_sighash = hash_to_message!(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, SigHashType::All)[..]);
- log_trace!(logger, "Checking HTLC tx signature {} by key {} against tx {} (sighash {}) with redeemscript {}", log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(keys.countersignatory_htlc_key.serialize()), encode::serialize_hex(&htlc_tx), log_bytes!(htlc_sighash[..]), encode::serialize_hex(&htlc_redeemscript));
+ log_trace!(logger, "Checking HTLC tx signature {} by key {} against tx {} (sighash {}) with redeemscript {} in channel {}.",
+ log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(keys.countersignatory_htlc_key.serialize()),
+ encode::serialize_hex(&htlc_tx), log_bytes!(htlc_sighash[..]), encode::serialize_hex(&htlc_redeemscript), log_bytes!(self.channel_id()));
if let Err(_) = self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &keys.countersignatory_htlc_key) {
return Err((None, ChannelError::Close("Invalid HTLC tx signature from peer".to_owned())));
}
);
let next_per_commitment_point = self.holder_signer.get_per_commitment_point(self.cur_holder_commitment_transaction_number - 1, &self.secp_ctx);
+ self.holder_signer.validate_holder_commitment(&holder_commitment_tx);
let per_commitment_secret = self.holder_signer.release_commitment_secret(self.cur_holder_commitment_transaction_number + 1);
// Update state now that we've passed all the can-fail calls...
let mut need_commitment = false;
- if !self.is_outbound() {
- if let Some(fee_update) = self.pending_update_fee {
- self.feerate_per_kw = fee_update;
- // We later use the presence of pending_update_fee to indicate we should generate a
- // commitment_signed upon receipt of revoke_and_ack, so we can only set it to None
- // if we're not awaiting a revoke (ie will send a commitment_signed now).
- if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) == 0 {
- need_commitment = true;
- self.pending_update_fee = None;
- }
+ if let &mut Some((_, ref mut update_state)) = &mut self.pending_update_fee {
+ if *update_state == FeeUpdateState::RemoteAnnounced {
+ *update_state = FeeUpdateState::AwaitingRemoteRevokeToAnnounce;
+ need_commitment = true;
}
}
Some(forward_info.clone())
} else { None };
if let Some(forward_info) = new_forward {
+ log_trace!(logger, "Updating HTLC {} to AwaitingRemoteRevokeToAnnounce due to commitment_signed in channel {}.",
+ log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info);
need_commitment = true;
}
if let Some(fail_reason) = if let &mut OutboundHTLCState::RemoteRemoved(ref mut fail_reason) = &mut htlc.state {
Some(fail_reason.take())
} else { None } {
+ log_trace!(logger, "Updating HTLC {} to AwaitingRemoteRevokeToRemove due to commitment_signed in channel {}.",
+ log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id));
htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove(fail_reason);
need_commitment = true;
}
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
}
- // TODO: Call maybe_propose_first_closing_signed on restoration (or call it here and
- // re-send the message on restoration)
+ log_debug!(logger, "Received valid commitment_signed from peer in channel {}, updated HTLC state but awaiting a monitor update resolution to reply.",
+ log_bytes!(self.channel_id));
return Err((Some(monitor_update), ChannelError::Ignore("Previous monitor update failure prevented generation of RAA".to_owned())));
}
- let (commitment_signed, closing_signed) = if need_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
+ let commitment_signed = if need_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
// If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
// we'll send one right away when we get the revoke_and_ack when we
// free_holding_cell_htlcs().
// strictly increasing by one, so decrement it here.
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
- (Some(msg), None)
- } else if !need_commitment {
- (None, self.maybe_propose_first_closing_signed(fee_estimator))
- } else { (None, None) };
+ Some(msg)
+ } else { None };
+
+ log_debug!(logger, "Received valid commitment_signed from peer in channel {}, updating HTLC state and responding with{} a revoke_and_ack.",
+ log_bytes!(self.channel_id()), if commitment_signed.is_some() { " our own commitment_signed and" } else { "" });
Ok((msgs::RevokeAndACK {
channel_id: self.channel_id,
per_commitment_secret,
next_per_commitment_point,
- }, commitment_signed, closing_signed, monitor_update))
+ }, commitment_signed, monitor_update))
}
/// Public version of the below, checking relevant preconditions first.
fn free_holding_cell_htlcs<L: Deref>(&mut self, logger: &L) -> Result<(Option<(msgs::CommitmentUpdate, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>), ChannelError> where L::Target: Logger {
assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
if self.holding_cell_htlc_updates.len() != 0 || self.holding_cell_update_fee.is_some() {
- log_trace!(logger, "Freeing holding cell with {} HTLC updates{}", self.holding_cell_htlc_updates.len(), if self.holding_cell_update_fee.is_some() { " and a fee update" } else { "" });
+ log_trace!(logger, "Freeing holding cell with {} HTLC updates{} in channel {}", self.holding_cell_htlc_updates.len(),
+ if self.holding_cell_update_fee.is_some() { " and a fee update" } else { "" }, log_bytes!(self.channel_id()));
let mut monitor_update = ChannelMonitorUpdate {
update_id: self.latest_monitor_update_id + 1, // We don't increment this yet!
Err(e) => {
match e {
ChannelError::Ignore(ref msg) => {
- log_info!(logger, "Failed to send HTLC with payment_hash {} due to {}", log_bytes!(payment_hash.0), msg);
+ log_info!(logger, "Failed to send HTLC with payment_hash {} due to {} in channel {}",
+ log_bytes!(payment_hash.0), msg, log_bytes!(self.channel_id()));
// If we fail to send here, then this HTLC should
// be failed backwards. Failing to send here
// indicates that this HTLC may keep being put back
}
},
&HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, htlc_id, .. } => {
- match self.get_update_fulfill_htlc(htlc_id, *payment_preimage, logger) {
- Ok((update_fulfill_msg_option, additional_monitor_update_opt)) => {
- update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap());
- if let Some(mut additional_monitor_update) = additional_monitor_update_opt {
- monitor_update.updates.append(&mut additional_monitor_update.updates);
- }
- },
- Err(e) => {
- if let ChannelError::Ignore(_) = e {}
- else {
- panic!("Got a non-IgnoreError action trying to fulfill holding cell HTLC");
- }
- }
- }
+ // If an HTLC claim was previously added to the holding cell (via
+ // `get_update_fulfill_htlc`, then generating the claim message itself must
+ // not fail - any in between attempts to claim the HTLC will have resulted
+ // in it hitting the holding cell again and we cannot change the state of a
+ // holding cell HTLC from fulfill to anything else.
+ let (update_fulfill_msg_option, mut additional_monitor_update) =
+ if let UpdateFulfillFetch::NewClaim { msg, monitor_update, .. } = self.get_update_fulfill_htlc(htlc_id, *payment_preimage, logger) {
+ (msg, monitor_update)
+ } else { unreachable!() };
+ update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap());
+ monitor_update.updates.append(&mut additional_monitor_update.updates);
},
&HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
match self.get_update_fail_htlc(htlc_id, err_packet.clone(), logger) {
- Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
+ Ok(update_fail_msg_option) => {
+ // If an HTLC failure was previously added to the holding cell (via
+ // `get_update_fail_htlc`) then generating the fail message itself
+ // must not fail - we should never end up in a state where we
+ // double-fail an HTLC or fail-then-claim an HTLC as it indicates
+ // we didn't wait for a full revocation before failing.
+ update_fail_htlcs.push(update_fail_msg_option.unwrap())
+ },
Err(e) => {
if let ChannelError::Ignore(_) = e {}
else {
if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() && self.holding_cell_update_fee.is_none() {
return Ok((None, htlcs_to_fail));
}
- let update_fee = if let Some(feerate) = self.holding_cell_update_fee {
- self.pending_update_fee = self.holding_cell_update_fee.take();
+ let update_fee = if let Some(feerate) = self.holding_cell_update_fee.take() {
+ assert!(self.is_outbound());
+ self.pending_update_fee = Some((feerate, FeeUpdateState::Outbound));
Some(msgs::UpdateFee {
channel_id: self.channel_id,
feerate_per_kw: feerate as u32,
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
+ log_debug!(logger, "Freeing holding cell in channel {} resulted in {}{} HTLCs added, {} HTLCs fulfilled, and {} HTLCs failed.",
+ log_bytes!(self.channel_id()), if update_fee.is_some() { "a fee update, " } else { "" },
+ update_add_htlcs.len(), update_fulfill_htlcs.len(), update_fail_htlcs.len());
+
Ok((Some((msgs::CommitmentUpdate {
update_add_htlcs,
update_fulfill_htlcs,
/// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
/// generating an appropriate error *after* the channel state has been updated based on the
/// revoke_and_ack message.
- pub fn revoke_and_ack<F: Deref, L: Deref>(&mut self, msg: &msgs::RevokeAndACK, fee_estimator: &F, logger: &L) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingHTLCInfo, u64)>, Vec<(HTLCSource, PaymentHash, HTLCFailReason)>, Option<msgs::ClosingSigned>, ChannelMonitorUpdate, Vec<(HTLCSource, PaymentHash)>), ChannelError>
- where F::Target: FeeEstimator,
- L::Target: Logger,
+ pub fn revoke_and_ack<L: Deref>(&mut self, msg: &msgs::RevokeAndACK, logger: &L) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingHTLCInfo, u64)>, Vec<(HTLCSource, PaymentHash, HTLCFailReason)>, ChannelMonitorUpdate, Vec<(HTLCSource, PaymentHash)>), ChannelError>
+ where L::Target: Logger,
{
if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
return Err(ChannelError::Close("Got revoke/ACK message when channel was not in an operational state".to_owned()));
return Err(ChannelError::Close("Peer sent revoke_and_ack after we'd started exchanging closing_signeds".to_owned()));
}
+ let secret = secp_check!(SecretKey::from_slice(&msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret".to_owned());
+
if let Some(counterparty_prev_commitment_point) = self.counterparty_prev_commitment_point {
- if PublicKey::from_secret_key(&self.secp_ctx, &secp_check!(SecretKey::from_slice(&msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret".to_owned())) != counterparty_prev_commitment_point {
+ if PublicKey::from_secret_key(&self.secp_ctx, &secret) != counterparty_prev_commitment_point {
return Err(ChannelError::Close("Got a revoke commitment secret which didn't correspond to their current pubkey".to_owned()));
}
}
*self.next_remote_commitment_tx_fee_info_cached.lock().unwrap() = None;
}
+ self.holder_signer.validate_counterparty_revocation(
+ self.cur_counterparty_commitment_transaction_number + 1,
+ &secret
+ );
self.commitment_secrets.provide_secret(self.cur_counterparty_commitment_transaction_number + 1, msg.per_commitment_secret)
.map_err(|_| ChannelError::Close("Previous secrets did not match new one".to_owned()))?;
self.latest_monitor_update_id += 1;
self.counterparty_cur_commitment_point = Some(msg.next_per_commitment_point);
self.cur_counterparty_commitment_transaction_number -= 1;
- log_trace!(logger, "Updating HTLCs on receipt of RAA...");
+ log_trace!(logger, "Updating HTLCs on receipt of RAA in channel {}...", log_bytes!(self.channel_id()));
let mut to_forward_infos = Vec::new();
let mut revoked_htlcs = Vec::new();
let mut update_fail_htlcs = Vec::new();
});
for htlc in pending_inbound_htlcs.iter_mut() {
let swap = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) = &htlc.state {
- log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to Committed", log_bytes!(htlc.payment_hash.0));
true
} else if let &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) = &htlc.state {
- log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to Committed", log_bytes!(htlc.payment_hash.0));
true
} else { false };
if swap {
mem::swap(&mut state, &mut htlc.state);
if let InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info) = state {
+ log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to AwaitingAnnouncedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info);
require_commitment = true;
} else if let InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info) = state {
match forward_info {
PendingHTLCStatus::Fail(fail_msg) => {
+ log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to LocalRemoved due to PendingHTLCStatus indicating failure", log_bytes!(htlc.payment_hash.0));
require_commitment = true;
match fail_msg {
HTLCFailureMsg::Relay(msg) => {
}
},
PendingHTLCStatus::Forward(forward_info) => {
+ log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to Committed", log_bytes!(htlc.payment_hash.0));
to_forward_infos.push((forward_info, htlc.htlc_id));
htlc.state = InboundHTLCState::Committed;
}
}
self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
- if self.is_outbound() {
- if let Some(feerate) = self.pending_update_fee.take() {
- self.feerate_per_kw = feerate;
- }
- } else {
- if let Some(feerate) = self.pending_update_fee {
- // Because a node cannot send two commitment_signeds in a row without getting a
- // revoke_and_ack from us (as it would otherwise not know the per_commitment_point
- // it should use to create keys with) and because a node can't send a
- // commitment_signed without changes, checking if the feerate is equal to the
- // pending feerate update is sufficient to detect require_commitment.
- if feerate == self.feerate_per_kw {
+ if let Some((feerate, update_state)) = self.pending_update_fee {
+ match update_state {
+ FeeUpdateState::Outbound => {
+ debug_assert!(self.is_outbound());
+ log_trace!(logger, " ...promoting outbound fee update {} to Committed", feerate);
+ self.feerate_per_kw = feerate;
+ self.pending_update_fee = None;
+ },
+ FeeUpdateState::RemoteAnnounced => { debug_assert!(!self.is_outbound()); },
+ FeeUpdateState::AwaitingRemoteRevokeToAnnounce => {
+ debug_assert!(!self.is_outbound());
+ log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce fee update {} to Committed", feerate);
require_commitment = true;
+ self.feerate_per_kw = feerate;
self.pending_update_fee = None;
- }
+ },
}
}
}
self.monitor_pending_forwards.append(&mut to_forward_infos);
self.monitor_pending_failures.append(&mut revoked_htlcs);
- return Ok((None, Vec::new(), Vec::new(), None, monitor_update, Vec::new()))
+ log_debug!(logger, "Received a valid revoke_and_ack for channel {} but awaiting a monitor update resolution to reply.", log_bytes!(self.channel_id()));
+ return Ok((None, Vec::new(), Vec::new(), monitor_update, Vec::new()))
}
match self.free_holding_cell_htlcs(logger)? {
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
- Ok((Some(commitment_update), to_forward_infos, revoked_htlcs, None, monitor_update, htlcs_to_fail))
+ Ok((Some(commitment_update), to_forward_infos, revoked_htlcs, monitor_update, htlcs_to_fail))
},
(None, htlcs_to_fail) => {
if require_commitment {
self.latest_monitor_update_id = monitor_update.update_id;
monitor_update.updates.append(&mut additional_update.updates);
+ log_debug!(logger, "Received a valid revoke_and_ack for channel {}. Responding with a commitment update with {} HTLCs failed.",
+ log_bytes!(self.channel_id()), update_fail_htlcs.len() + update_fail_malformed_htlcs.len());
Ok((Some(msgs::CommitmentUpdate {
update_add_htlcs: Vec::new(),
update_fulfill_htlcs: Vec::new(),
update_fail_malformed_htlcs,
update_fee: None,
commitment_signed
- }), to_forward_infos, revoked_htlcs, None, monitor_update, htlcs_to_fail))
+ }), to_forward_infos, revoked_htlcs, monitor_update, htlcs_to_fail))
} else {
- Ok((None, to_forward_infos, revoked_htlcs, self.maybe_propose_first_closing_signed(fee_estimator), monitor_update, htlcs_to_fail))
+ log_debug!(logger, "Received a valid revoke_and_ack for channel {} with no reply necessary.", log_bytes!(self.channel_id()));
+ Ok((None, to_forward_infos, revoked_htlcs, monitor_update, htlcs_to_fail))
}
}
}
-
}
/// Adds a pending update to this channel. See the doc for send_htlc for
panic!("Cannot update fee while peer is disconnected/we're awaiting a monitor update (ChannelManager should have caught this)");
}
- if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
+ if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
self.holding_cell_update_fee = Some(feerate_per_kw);
return None;
}
debug_assert!(self.pending_update_fee.is_none());
- self.pending_update_fee = Some(feerate_per_kw);
+ self.pending_update_fee = Some((feerate_per_kw, FeeUpdateState::Outbound));
Some(msgs::UpdateFee {
channel_id: self.channel_id,
// Upon reconnect we have to start the closing_signed dance over, but shutdown messages
// will be retransmitted.
self.last_sent_closing_fee = None;
+ self.pending_counterparty_closing_signed = None;
+ self.closing_fee_limits = None;
let mut inbound_drop_count = 0;
self.pending_inbound_htlcs.retain(|htlc| {
});
self.next_counterparty_htlc_id -= inbound_drop_count;
+ if let Some((_, update_state)) = self.pending_update_fee {
+ if update_state == FeeUpdateState::RemoteAnnounced {
+ debug_assert!(!self.is_outbound());
+ self.pending_update_fee = None;
+ }
+ }
+
for htlc in self.pending_outbound_htlcs.iter_mut() {
if let OutboundHTLCState::RemoteRemoved(_) = htlc.state {
// They sent us an update to remove this but haven't yet sent the corresponding
}
self.channel_state |= ChannelState::PeerDisconnected as u32;
- log_debug!(logger, "Peer disconnection resulted in {} remote-announced HTLC drops on channel {}", inbound_drop_count, log_bytes!(self.channel_id()));
+ log_trace!(logger, "Peer disconnection resulted in {} remote-announced HTLC drops on channel {}", inbound_drop_count, log_bytes!(self.channel_id()));
}
/// Indicates that a ChannelMonitor update failed to be stored by the client and further
self.monitor_pending_revoke_and_ack = false;
self.monitor_pending_commitment_signed = false;
let order = self.resend_order.clone();
- log_trace!(logger, "Restored monitor updating resulting in {}{} commitment update and {} RAA, with {} first",
- if funding_broadcastable.is_some() { "a funding broadcastable, " } else { "" },
- if commitment_update.is_some() { "a" } else { "no" },
- if raa.is_some() { "an" } else { "no" },
+ log_debug!(logger, "Restored monitor updating in channel {} resulting in {}{} commitment update and {} RAA, with {} first",
+ log_bytes!(self.channel_id()), if funding_broadcastable.is_some() { "a funding broadcastable, " } else { "" },
+ if commitment_update.is_some() { "a" } else { "no" }, if raa.is_some() { "an" } else { "no" },
match order { RAACommitmentOrder::CommitmentFirst => "commitment", RAACommitmentOrder::RevokeAndACKFirst => "RAA"});
(raa, commitment_update, order, forwards, failures, funding_broadcastable, funding_locked)
}
return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish".to_owned()));
}
Channel::<Signer>::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
- self.pending_update_fee = Some(msg.feerate_per_kw);
+ let feerate_over_dust_buffer = msg.feerate_per_kw > self.get_dust_buffer_feerate();
+
+ self.pending_update_fee = Some((msg.feerate_per_kw, FeeUpdateState::RemoteAnnounced));
self.update_time_counter += 1;
+ // If the feerate has increased over the previous dust buffer (note that
+ // `get_dust_buffer_feerate` considers the `pending_update_fee` status), check that we
+ // won't be pushed over our dust exposure limit by the feerate increase.
+ if feerate_over_dust_buffer {
+ let inbound_stats = self.get_inbound_pending_htlc_stats();
+ let outbound_stats = self.get_outbound_pending_htlc_stats();
+ let holder_tx_dust_exposure = inbound_stats.on_holder_tx_dust_exposure_msat + outbound_stats.on_holder_tx_dust_exposure_msat;
+ let counterparty_tx_dust_exposure = inbound_stats.on_counterparty_tx_dust_exposure_msat + outbound_stats.on_counterparty_tx_dust_exposure_msat;
+ if holder_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
+ 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)",
+ msg.feerate_per_kw, holder_tx_dust_exposure)));
+ }
+ if counterparty_tx_dust_exposure > self.get_max_dust_htlc_exposure_msat() {
+ 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)",
+ msg.feerate_per_kw, counterparty_tx_dust_exposure)));
+ }
+ }
Ok(())
}
}
}
- log_trace!(logger, "Regenerated latest commitment update with {} update_adds, {} update_fulfills, {} update_fails, and {} update_fail_malformeds",
+ let update_fee = if self.is_outbound() && self.pending_update_fee.is_some() {
+ Some(msgs::UpdateFee {
+ channel_id: self.channel_id(),
+ feerate_per_kw: self.pending_update_fee.unwrap().0,
+ })
+ } else { None };
+
+ log_trace!(logger, "Regenerated latest commitment update in channel {} with{} {} update_adds, {} update_fulfills, {} update_fails, and {} update_fail_malformeds",
+ log_bytes!(self.channel_id()), if update_fee.is_some() { " update_fee," } else { "" },
update_add_htlcs.len(), update_fulfill_htlcs.len(), update_fail_htlcs.len(), update_fail_malformed_htlcs.len());
msgs::CommitmentUpdate {
- update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs,
- update_fee: None,
+ update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs, update_fee,
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,
}
}
self.channel_state &= !(ChannelState::PeerDisconnected as u32);
let shutdown_msg = if self.channel_state & (ChannelState::LocalShutdownSent as u32) != 0 {
+ assert!(self.shutdown_scriptpubkey.is_some());
Some(msgs::Shutdown {
channel_id: self.channel_id,
scriptpubkey: self.get_closing_scriptpubkey(),
// now!
match self.free_holding_cell_htlcs(logger) {
Err(ChannelError::Close(msg)) => return Err(ChannelError::Close(msg)),
- Err(ChannelError::Ignore(_)) | Err(ChannelError::CloseDelayBroadcast(_)) => panic!("Got non-channel-failing result from free_holding_cell_htlcs"),
+ Err(ChannelError::Warn(_)) | Err(ChannelError::Ignore(_)) | Err(ChannelError::CloseDelayBroadcast(_)) =>
+ panic!("Got non-channel-failing result from free_holding_cell_htlcs"),
Ok((Some((commitment_update, monitor_update)), htlcs_to_fail)) => {
return Ok((resend_funding_locked, required_revoke, Some(commitment_update), Some(monitor_update), self.resend_order.clone(), htlcs_to_fail, shutdown_msg));
},
}
}
- fn maybe_propose_first_closing_signed<F: Deref>(&mut self, fee_estimator: &F) -> Option<msgs::ClosingSigned>
+ /// Calculates and returns our minimum and maximum closing transaction fee amounts, in whole
+ /// satoshis. The amounts remain consistent unless a peer disconnects/reconnects or we restart,
+ /// at which point they will be recalculated.
+ fn calculate_closing_fee_limits<F: Deref>(&mut self, fee_estimator: &F) -> (u64, u64)
where F::Target: FeeEstimator
{
- if !self.is_outbound() || !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() ||
- self.channel_state & (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32) != BOTH_SIDES_SHUTDOWN_MASK ||
- self.last_sent_closing_fee.is_some() || self.pending_update_fee.is_some() {
- return None;
- }
+ if let Some((min, max)) = self.closing_fee_limits { return (min, max); }
+ // Propose a range from our current Background feerate to our Normal feerate plus our
+ // force_close_avoidance_max_fee_satoshis.
+ // If we fail to come to consensus, we'll have to force-close.
let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
- if self.feerate_per_kw > proposed_feerate {
- proposed_feerate = self.feerate_per_kw;
- }
+ let normal_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
+ let mut proposed_max_feerate = if self.is_outbound() { normal_feerate } else { u32::max_value() };
+
+ // The spec requires that (when the channel does not have anchors) we only send absolute
+ // channel fees no greater than the absolute channel fee on the current commitment
+ // transaction. It's unclear *which* commitment transaction this refers to, and there isn't
+ // very good reason to apply such a limit in any case. We don't bother doing so, risking
+ // some force-closure by old nodes, but we wanted to close the channel anyway.
+
+ if let Some(target_feerate) = self.target_closing_feerate_sats_per_kw {
+ let min_feerate = if self.is_outbound() { target_feerate } else { cmp::min(self.feerate_per_kw, target_feerate) };
+ proposed_feerate = cmp::max(proposed_feerate, min_feerate);
+ proposed_max_feerate = cmp::max(proposed_max_feerate, min_feerate);
+ }
+
+ // Note that technically we could end up with a lower minimum fee if one sides' balance is
+ // below our dust limit, causing the output to disappear. We don't bother handling this
+ // case, however, as this should only happen if a channel is closed before any (material)
+ // payments have been made on it. This may cause slight fee overpayment and/or failure to
+ // come to consensus with our counterparty on appropriate fees, however it should be a
+ // relatively rare case. We can revisit this later, though note that in order to determine
+ // if the funders' output is dust we have to know the absolute fee we're going to use.
let tx_weight = self.get_closing_transaction_weight(Some(&self.get_closing_scriptpubkey()), Some(self.counterparty_shutdown_scriptpubkey.as_ref().unwrap()));
let proposed_total_fee_satoshis = proposed_feerate as u64 * tx_weight / 1000;
+ let proposed_max_total_fee_satoshis = if self.is_outbound() {
+ // We always add force_close_avoidance_max_fee_satoshis to our normal
+ // feerate-calculated fee, but allow the max to be overridden if we're using a
+ // target feerate-calculated fee.
+ cmp::max(normal_feerate as u64 * tx_weight / 1000 + self.config.force_close_avoidance_max_fee_satoshis,
+ proposed_max_feerate as u64 * tx_weight / 1000)
+ } else {
+ u64::max_value()
+ };
+
+ self.closing_fee_limits = Some((proposed_total_fee_satoshis, proposed_max_total_fee_satoshis));
+ self.closing_fee_limits.clone().unwrap()
+ }
+
+ /// Returns true if we're ready to commence the closing_signed negotiation phase. This is true
+ /// after both sides have exchanged a `shutdown` message and all HTLCs have been drained. At
+ /// this point if we're the funder we should send the initial closing_signed, and in any case
+ /// shutdown should complete within a reasonable timeframe.
+ fn closing_negotiation_ready(&self) -> bool {
+ self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() &&
+ self.channel_state &
+ (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32 |
+ ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)
+ == BOTH_SIDES_SHUTDOWN_MASK &&
+ self.pending_update_fee.is_none()
+ }
+
+ /// Checks if the closing_signed negotiation is making appropriate progress, possibly returning
+ /// an Err if no progress is being made and the channel should be force-closed instead.
+ /// Should be called on a one-minute timer.
+ pub fn timer_check_closing_negotiation_progress(&mut self) -> Result<(), ChannelError> {
+ if self.closing_negotiation_ready() {
+ if self.closing_signed_in_flight {
+ return Err(ChannelError::Close("closing_signed negotiation failed to finish within two timer ticks".to_owned()));
+ } else {
+ self.closing_signed_in_flight = true;
+ }
+ }
+ Ok(())
+ }
+
+ pub fn maybe_propose_closing_signed<F: Deref, L: Deref>(&mut self, fee_estimator: &F, logger: &L)
+ -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), ChannelError>
+ where F::Target: FeeEstimator, L::Target: Logger
+ {
+ if self.last_sent_closing_fee.is_some() || !self.closing_negotiation_ready() {
+ return Ok((None, None));
+ }
+
+ if !self.is_outbound() {
+ if let Some(msg) = &self.pending_counterparty_closing_signed.take() {
+ return self.closing_signed(fee_estimator, &msg);
+ }
+ return Ok((None, None));
+ }
+
+ let (our_min_fee, our_max_fee) = self.calculate_closing_fee_limits(fee_estimator);
+
+ assert!(self.shutdown_scriptpubkey.is_some());
+ let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(our_min_fee, false);
+ log_trace!(logger, "Proposing initial closing_signed for our counterparty with a fee range of {}-{} sat (with initial proposal {} sats)",
+ our_min_fee, our_max_fee, total_fee_satoshis);
- let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
let sig = self.holder_signer
.sign_closing_transaction(&closing_tx, &self.secp_ctx)
- .ok();
- assert!(closing_tx.get_weight() as u64 <= tx_weight);
- if sig.is_none() { return None; }
+ .map_err(|()| ChannelError::Close("Failed to get signature for closing transaction.".to_owned()))?;
- self.last_sent_closing_fee = Some((proposed_feerate, total_fee_satoshis, sig.clone().unwrap()));
- Some(msgs::ClosingSigned {
+ self.last_sent_closing_fee = Some((total_fee_satoshis, sig.clone()));
+ Ok((Some(msgs::ClosingSigned {
channel_id: self.channel_id,
fee_satoshis: total_fee_satoshis,
- signature: sig.unwrap(),
- })
+ signature: sig,
+ fee_range: Some(msgs::ClosingSignedFeeRange {
+ min_fee_satoshis: our_min_fee,
+ max_fee_satoshis: our_max_fee,
+ }),
+ }), None))
}
- pub fn shutdown<F: Deref>(&mut self, fee_estimator: &F, their_features: &InitFeatures, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, PaymentHash)>), ChannelError>
- where F::Target: FeeEstimator
+ pub fn shutdown<K: Deref>(
+ &mut self, keys_provider: &K, their_features: &InitFeatures, msg: &msgs::Shutdown
+ ) -> Result<(Option<msgs::Shutdown>, Option<ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), ChannelError>
+ where K::Target: KeysInterface<Signer = Signer>
{
if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
return Err(ChannelError::Close("Peer sent shutdown when we needed a channel_reestablish".to_owned()));
}
assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
- if is_unsupported_shutdown_script(&their_features, &msg.scriptpubkey) {
- return Err(ChannelError::Close(format!("Got a nonstandard scriptpubkey ({}) from remote peer", msg.scriptpubkey.to_bytes().to_hex())));
- }
+ let shutdown_scriptpubkey = match ShutdownScript::try_from((msg.scriptpubkey.clone(), their_features)) {
+ Ok(script) => script.into_inner(),
+ Err(_) => return Err(ChannelError::Close(format!("Got a nonstandard scriptpubkey ({}) from remote peer", msg.scriptpubkey.to_bytes().to_hex()))),
+ };
if self.counterparty_shutdown_scriptpubkey.is_some() {
- if Some(&msg.scriptpubkey) != self.counterparty_shutdown_scriptpubkey.as_ref() {
- return Err(ChannelError::Close(format!("Got shutdown request with a scriptpubkey ({}) which did not match their previous scriptpubkey.", msg.scriptpubkey.to_bytes().to_hex())));
+ if Some(&shutdown_scriptpubkey) != self.counterparty_shutdown_scriptpubkey.as_ref() {
+ return Err(ChannelError::Close(format!("Got shutdown request with a scriptpubkey ({}) which did not match their previous scriptpubkey.", shutdown_scriptpubkey.to_bytes().to_hex())));
}
} else {
- self.counterparty_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
+ self.counterparty_shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
}
+ // If we have any LocalAnnounced updates we'll probably just get back an update_fail_htlc
+ // immediately after the commitment dance, but we can send a Shutdown because we won't send
+ // any further commitment updates after we set LocalShutdownSent.
+ let send_shutdown = (self.channel_state & ChannelState::LocalShutdownSent as u32) != ChannelState::LocalShutdownSent as u32;
+
+ let update_shutdown_script = match self.shutdown_scriptpubkey {
+ Some(_) => false,
+ None => {
+ assert!(send_shutdown);
+ let shutdown_scriptpubkey = keys_provider.get_shutdown_scriptpubkey();
+ if !shutdown_scriptpubkey.is_compatible(their_features) {
+ return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
+ }
+ self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
+ true
+ },
+ };
+
// From here on out, we may not fail!
self.channel_state |= ChannelState::RemoteShutdownSent as u32;
self.update_time_counter += 1;
+ let monitor_update = if update_shutdown_script {
+ self.latest_monitor_update_id += 1;
+ Some(ChannelMonitorUpdate {
+ update_id: self.latest_monitor_update_id,
+ updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ }],
+ })
+ } else { None };
+ let shutdown = if send_shutdown {
+ Some(msgs::Shutdown {
+ channel_id: self.channel_id,
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ })
+ } else { None };
+
// We can't send our shutdown until we've committed all of our pending HTLCs, but the
// remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
// cell HTLCs and return them to fail the payment.
_ => true
}
});
- // If we have any LocalAnnounced updates we'll probably just get back a update_fail_htlc
- // immediately after the commitment dance, but we can send a Shutdown cause we won't send
- // any further commitment updates after we set LocalShutdownSent.
-
- let shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
- None
- } else {
- Some(msgs::Shutdown {
- channel_id: self.channel_id,
- scriptpubkey: self.get_closing_scriptpubkey(),
- })
- };
self.channel_state |= ChannelState::LocalShutdownSent as u32;
self.update_time_counter += 1;
- Ok((shutdown, self.maybe_propose_first_closing_signed(fee_estimator), dropped_outbound_htlcs))
+ Ok((shutdown, monitor_update, dropped_outbound_htlcs))
}
fn build_signed_closing_transaction(&self, tx: &mut Transaction, counterparty_sig: &Signature, sig: &Signature) {
return Err(ChannelError::Close("Remote tried to send us a closing tx with > 21 million BTC fee".to_owned()));
}
+ if self.is_outbound() && self.last_sent_closing_fee.is_none() {
+ return Err(ChannelError::Close("Remote tried to send a closing_signed when we were supposed to propose the first one".to_owned()));
+ }
+
+ if self.channel_state & ChannelState::MonitorUpdateFailed as u32 != 0 {
+ self.pending_counterparty_closing_signed = Some(msg.clone());
+ return Ok((None, None));
+ }
+
let funding_redeemscript = self.get_funding_redeemscript();
let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
if used_total_fee != msg.fee_satoshis {
- return Err(ChannelError::Close(format!("Remote sent us a closing_signed with a fee greater than the value they can claim. Fee in message: {}", msg.fee_satoshis)));
+ 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)));
}
let mut sighash = hash_to_message!(&bip143::SigHashCache::new(&closing_tx).signature_hash(0, &funding_redeemscript, self.channel_value_satoshis, SigHashType::All)[..]);
},
};
- let closing_tx_max_weight = self.get_closing_transaction_weight(
- if let Some(oup) = closing_tx.output.get(0) { Some(&oup.script_pubkey) } else { None },
- if let Some(oup) = closing_tx.output.get(1) { Some(&oup.script_pubkey) } else { None });
- if let Some((_, last_fee, sig)) = self.last_sent_closing_fee {
+ assert!(self.shutdown_scriptpubkey.is_some());
+ if let Some((last_fee, sig)) = self.last_sent_closing_fee {
if last_fee == msg.fee_satoshis {
self.build_signed_closing_transaction(&mut closing_tx, &msg.signature, &sig);
- assert!(closing_tx.get_weight() as u64 <= closing_tx_max_weight);
- debug_assert!(closing_tx.get_weight() as u64 >= closing_tx_max_weight - 2);
self.channel_state = ChannelState::ShutdownComplete as u32;
self.update_time_counter += 1;
return Ok((None, Some(closing_tx)));
}
}
- macro_rules! propose_new_feerate {
- ($new_feerate: expr) => {
- let tx_weight = self.get_closing_transaction_weight(Some(&self.get_closing_scriptpubkey()), Some(self.counterparty_shutdown_scriptpubkey.as_ref().unwrap()));
- let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate as u64 * tx_weight / 1000, false);
+ let (our_min_fee, our_max_fee) = self.calculate_closing_fee_limits(fee_estimator);
+
+ macro_rules! propose_fee {
+ ($new_fee: expr) => {
+ let (mut tx, used_fee) = if $new_fee == msg.fee_satoshis {
+ (closing_tx, $new_fee)
+ } else {
+ self.build_closing_transaction($new_fee, false)
+ };
+
let sig = self.holder_signer
- .sign_closing_transaction(&closing_tx, &self.secp_ctx)
+ .sign_closing_transaction(&tx, &self.secp_ctx)
.map_err(|_| ChannelError::Close("External signer refused to sign closing transaction".to_owned()))?;
- assert!(closing_tx.get_weight() as u64 <= tx_weight);
- self.last_sent_closing_fee = Some(($new_feerate, used_total_fee, sig.clone()));
+
+ let signed_tx = if $new_fee == msg.fee_satoshis {
+ self.channel_state = ChannelState::ShutdownComplete as u32;
+ self.update_time_counter += 1;
+ self.build_signed_closing_transaction(&mut tx, &msg.signature, &sig);
+ Some(tx)
+ } else { None };
+
+ self.last_sent_closing_fee = Some((used_fee, sig.clone()));
return Ok((Some(msgs::ClosingSigned {
channel_id: self.channel_id,
- fee_satoshis: used_total_fee,
+ fee_satoshis: used_fee,
signature: sig,
- }), None))
+ fee_range: Some(msgs::ClosingSignedFeeRange {
+ min_fee_satoshis: our_min_fee,
+ max_fee_satoshis: our_max_fee,
+ }),
+ }), signed_tx))
}
}
- let mut min_feerate = 253;
- if self.is_outbound() {
- let max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
- if (msg.fee_satoshis as u64) > max_feerate as u64 * closing_tx_max_weight / 1000 {
- if let Some((last_feerate, _, _)) = self.last_sent_closing_fee {
- if max_feerate <= last_feerate {
- return Err(ChannelError::Close(format!("Unable to come to consensus about closing feerate, remote wanted something higher ({}) than our Normal feerate ({})", last_feerate, max_feerate)));
- }
+ if let Some(msgs::ClosingSignedFeeRange { min_fee_satoshis, max_fee_satoshis }) = msg.fee_range {
+ if msg.fee_satoshis < min_fee_satoshis || msg.fee_satoshis > max_fee_satoshis {
+ 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)));
+ }
+ if max_fee_satoshis < our_min_fee {
+ 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)));
+ }
+ if min_fee_satoshis > our_max_fee {
+ 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)));
+ }
+
+ if !self.is_outbound() {
+ // They have to pay, so pick the highest fee in the overlapping range.
+ debug_assert_eq!(our_max_fee, u64::max_value()); // We should never set an upper bound
+ propose_fee!(cmp::min(max_fee_satoshis, our_max_fee));
+ } else {
+ if msg.fee_satoshis < our_min_fee || msg.fee_satoshis > our_max_fee {
+ 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.",
+ msg.fee_satoshis, our_min_fee, our_max_fee)));
}
- propose_new_feerate!(max_feerate);
+ // The proposed fee is in our acceptable range, accept it and broadcast!
+ propose_fee!(msg.fee_satoshis);
}
} else {
- min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
- }
- if (msg.fee_satoshis as u64) < min_feerate as u64 * closing_tx_max_weight / 1000 {
- if let Some((last_feerate, _, _)) = self.last_sent_closing_fee {
- if min_feerate >= last_feerate {
- return Err(ChannelError::Close(format!("Unable to come to consensus about closing feerate, remote wanted something lower ({}) than our Background feerate ({}).", last_feerate, min_feerate)));
+ // Old fee style negotiation. We don't bother to enforce whether they are complying
+ // with the "making progress" requirements, we just comply and hope for the best.
+ if let Some((last_fee, _)) = self.last_sent_closing_fee {
+ if msg.fee_satoshis > last_fee {
+ if msg.fee_satoshis < our_max_fee {
+ propose_fee!(msg.fee_satoshis);
+ } else if last_fee < our_max_fee {
+ propose_fee!(our_max_fee);
+ } else {
+ 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)));
+ }
+ } else {
+ if msg.fee_satoshis > our_min_fee {
+ propose_fee!(msg.fee_satoshis);
+ } else if last_fee > our_min_fee {
+ propose_fee!(our_min_fee);
+ } else {
+ 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)));
+ }
+ }
+ } else {
+ if msg.fee_satoshis < our_min_fee {
+ propose_fee!(our_min_fee);
+ } else if msg.fee_satoshis > our_max_fee {
+ propose_fee!(our_max_fee);
+ } else {
+ propose_fee!(msg.fee_satoshis);
}
}
- propose_new_feerate!(min_feerate);
}
-
- let sig = self.holder_signer
- .sign_closing_transaction(&closing_tx, &self.secp_ctx)
- .map_err(|_| ChannelError::Close("External signer refused to sign closing transaction".to_owned()))?;
- self.build_signed_closing_transaction(&mut closing_tx, &msg.signature, &sig);
- assert!(closing_tx.get_weight() as u64 <= closing_tx_max_weight);
- debug_assert!(closing_tx.get_weight() as u64 >= closing_tx_max_weight - 2);
-
- self.channel_state = ChannelState::ShutdownComplete as u32;
- self.update_time_counter += 1;
-
- Ok((Some(msgs::ClosingSigned {
- channel_id: self.channel_id,
- fee_satoshis: msg.fee_satoshis,
- signature: sig,
- }), Some(closing_tx)))
}
// Public utilities:
self.channel_id
}
+ pub fn minimum_depth(&self) -> Option<u32> {
+ self.minimum_depth
+ }
+
/// Gets the "user_id" value passed into the construction of this channel. It has no special
/// meaning and exists only to allow users to have a persistent identifier of a channel.
pub fn get_user_id(&self) -> u64 {
&self.channel_transaction_parameters.holder_pubkeys
}
- fn get_counterparty_selected_contest_delay(&self) -> u16 {
- self.channel_transaction_parameters.counterparty_parameters.as_ref().unwrap().selected_contest_delay
+ pub fn get_counterparty_selected_contest_delay(&self) -> Option<u16> {
+ self.channel_transaction_parameters.counterparty_parameters
+ .as_ref().map(|params| params.selected_contest_delay)
}
fn get_counterparty_pubkeys(&self) -> &ChannelPublicKeys {
}
pub fn get_fee_proportional_millionths(&self) -> u32 {
- self.config.fee_proportional_millionths
+ self.config.forwarding_fee_proportional_millionths
}
pub fn get_cltv_expiry_delta(&self) -> u16 {
cmp::max(self.config.cltv_expiry_delta, MIN_CLTV_EXPIRY_DELTA)
}
- #[cfg(test)]
+ pub fn get_max_dust_htlc_exposure_msat(&self) -> u64 {
+ self.config.max_dust_htlc_exposure_msat
+ }
+
pub fn get_feerate(&self) -> u32 {
self.feerate_per_kw
}
+ pub fn get_dust_buffer_feerate(&self) -> u32 {
+ // When calculating our exposure to dust HTLCs, we assume that the channel feerate
+ // may, at any point, increase by at least 10 sat/vB (i.e 2530 sat/kWU) or 25%,
+ // whichever is higher. This ensures that we aren't suddenly exposed to significantly
+ // more dust balance if the feerate increases when we have several HTLCs pending
+ // which are near the dust limit.
+ let mut feerate_per_kw = self.feerate_per_kw;
+ if let Some((feerate, _)) = self.pending_update_fee {
+ feerate_per_kw = cmp::max(feerate_per_kw, feerate);
+ }
+ cmp::max(2530, feerate_per_kw * 1250 / 1000)
+ }
+
pub fn get_cur_holder_commitment_transaction_number(&self) -> u64 {
self.cur_holder_commitment_transaction_number + 1
}
ChannelValueStat {
value_to_self_msat: self.value_to_self_msat,
channel_value_msat: self.channel_value_satoshis * 1000,
- channel_reserve_msat: self.counterparty_selected_channel_reserve_satoshis * 1000,
+ channel_reserve_msat: self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000,
pending_outbound_htlcs_amount_msat: self.pending_outbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
pending_inbound_htlcs_amount_msat: self.pending_inbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
holding_cell_outbound_amount_msat: {
/// Gets the fee we'd want to charge for adding an HTLC output to this Channel
/// Allowed in any state (including after shutdown)
- pub fn get_holder_fee_base_msat<F: Deref>(&self, fee_estimator: &F) -> u32
- where F::Target: FeeEstimator
- {
- // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
- // output value back into a transaction with the regular channel output:
-
- // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
- let mut res = self.feerate_per_kw as u64 * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
-
- if self.is_outbound() {
- // + the marginal fee increase cost to us in the commitment transaction:
- res += self.feerate_per_kw as u64 * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
- }
-
- // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
- res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) as u64 * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
-
- res as u32
+ pub fn get_outbound_forwarding_fee_base_msat(&self) -> u32 {
+ self.config.forwarding_fee_base_msat
}
/// Returns true if we've ever received a message from the remote end for this Channel
/// is_usable() and considers things like the channel being temporarily disabled.
/// Allowed in any state (including after shutdown)
pub fn is_live(&self) -> bool {
- self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) == 0)
+ self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32) == 0)
}
/// Returns true if this channel has been marked as awaiting a monitor update to move forward.
self.channel_state >= ChannelState::FundingSent as u32
}
+ /// Returns true if our peer has either initiated or agreed to shut down the channel.
+ pub fn received_shutdown(&self) -> bool {
+ (self.channel_state & ChannelState::RemoteShutdownSent as u32) != 0
+ }
+
+ /// Returns true if we either initiated or agreed to shut down the channel.
+ pub fn sent_shutdown(&self) -> bool {
+ (self.channel_state & ChannelState::LocalShutdownSent as u32) != 0
+ }
+
/// Returns true if this channel is fully shut down. True here implies that no further actions
/// may/will be taken on this channel, and thus this object should be freed. Any future changes
/// will be handled appropriately by the chain monitor.
self.funding_tx_confirmation_height = 0;
}
- if funding_tx_confirmations < self.minimum_depth as i64 {
+ if funding_tx_confirmations < self.minimum_depth.unwrap_or(0) as i64 {
return None;
}
// send it immediately instead of waiting for a best_block_updated call (which
// may have already happened for this block).
if let Some(funding_locked) = self.check_get_funding_locked(height) {
+ log_info!(logger, "Sending a funding_locked to our peer for channel {}", log_bytes!(self.channel_id));
return Ok(Some(funding_locked));
}
}
for inp in tx.input.iter() {
if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
- log_trace!(logger, "Detected channel-closing tx {} spending {}:{}, closing channel {}", tx.txid(), inp.previous_output.txid, inp.previous_output.vout, log_bytes!(self.channel_id()));
+ 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()));
return Err(msgs::ErrorMessage {
channel_id: self.channel_id(),
data: "Commitment or closing transaction was confirmed on chain.".to_owned()
///
/// May return some HTLCs (and their payment_hash) which have timed out and should be failed
/// back.
- pub fn best_block_updated(&mut self, height: u32, highest_header_time: u32) -> Result<(Option<msgs::FundingLocked>, Vec<(HTLCSource, PaymentHash)>), msgs::ErrorMessage> {
+ pub fn best_block_updated<L: Deref>(&mut self, height: u32, highest_header_time: u32, logger: &L)
+ -> Result<(Option<msgs::FundingLocked>, Vec<(HTLCSource, PaymentHash)>), msgs::ErrorMessage> where L::Target: Logger {
let mut timed_out_htlcs = Vec::new();
let unforwarded_htlc_cltv_limit = height + HTLC_FAIL_BACK_BUFFER;
self.holding_cell_htlc_updates.retain(|htlc_update| {
self.update_time_counter = cmp::max(self.update_time_counter, highest_header_time);
if let Some(funding_locked) = self.check_get_funding_locked(height) {
+ log_info!(logger, "Sending a funding_locked to our peer for channel {}", log_bytes!(self.channel_id));
return Ok((Some(funding_locked), timed_out_htlcs));
}
// the funding transaction's confirmation count has dipped below minimum_depth / 2,
// close the channel and hope we can get the latest state on chain (because presumably
// the funding transaction is at least still in the mempool of most nodes).
- if funding_tx_confirmations < self.minimum_depth as i64 / 2 {
+ if funding_tx_confirmations < self.minimum_depth.unwrap() as i64 / 2 {
return Err(msgs::ErrorMessage {
channel_id: self.channel_id(),
- data: format!("Funding transaction was un-confirmed. Locked at {} confs, now have {} confs.", self.minimum_depth, funding_tx_confirmations),
+ data: format!("Funding transaction was un-confirmed. Locked at {} confs, now have {} confs.", self.minimum_depth.unwrap(), funding_tx_confirmations),
});
}
}
/// Indicates the funding transaction is no longer confirmed in the main chain. This may
/// force-close the channel, but may also indicate a harmless reorganization of a block or two
/// before the channel has reached funding_locked and we can just wait for more blocks.
- pub fn funding_transaction_unconfirmed(&mut self) -> Result<(), msgs::ErrorMessage> {
+ pub fn funding_transaction_unconfirmed<L: Deref>(&mut self, logger: &L) -> Result<(), msgs::ErrorMessage> where L::Target: Logger {
if self.funding_tx_confirmation_height != 0 {
// We handle the funding disconnection by calling best_block_updated with a height one
// below where our funding was connected, implying a reorg back to conf_height - 1.
// larger. If we don't know that time has moved forward, we can just set it to the last
// time we saw and it will be ignored.
let best_time = self.update_time_counter;
- match self.best_block_updated(reorg_height, best_time) {
+ match self.best_block_updated(reorg_height, best_time, logger) {
Ok((funding_locked, timed_out_htlcs)) => {
assert!(funding_locked.is_none(), "We can't generate a funding with 0 confirmations?");
assert!(timed_out_htlcs.is_empty(), "We can't have accepted HTLCs with a timeout before our funding confirmation?");
htlc_basepoint: keys.htlc_basepoint,
first_per_commitment_point,
channel_flags: if self.config.announced_channel {1} else {0},
- shutdown_scriptpubkey: OptionalField::Present(if self.config.commit_upfront_shutdown_pubkey { self.get_closing_scriptpubkey() } else { Builder::new().into_script() })
+ shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+ Some(script) => script.clone().into_inner(),
+ None => Builder::new().into_script(),
+ }),
}
}
max_htlc_value_in_flight_msat: Channel::<Signer>::get_holder_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
channel_reserve_satoshis: Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis),
htlc_minimum_msat: self.holder_htlc_minimum_msat,
- minimum_depth: self.minimum_depth,
+ minimum_depth: self.minimum_depth.unwrap(),
to_self_delay: self.get_holder_selected_contest_delay(),
max_accepted_htlcs: OUR_MAX_HTLCS,
funding_pubkey: keys.funding_pubkey,
delayed_payment_basepoint: keys.delayed_payment_basepoint,
htlc_basepoint: keys.htlc_basepoint,
first_per_commitment_point,
- shutdown_scriptpubkey: OptionalField::Present(if self.config.commit_upfront_shutdown_pubkey { self.get_closing_scriptpubkey() } else { Builder::new().into_script() })
+ shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+ Some(script) => script.clone().into_inner(),
+ None => Builder::new().into_script(),
+ }),
}
}
/// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
fn get_outbound_funding_created_signature<L: Deref>(&mut self, logger: &L) -> Result<Signature, ChannelError> where L::Target: Logger {
let counterparty_keys = self.build_remote_transaction_keys()?;
- let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, self.feerate_per_kw, logger).0;
+ let counterparty_initial_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, false, logger).0;
Ok(self.holder_signer.sign_counterparty_commitment(&counterparty_initial_commitment_tx, &self.secp_ctx)
.map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed".to_owned()))?.0)
}
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 = 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 {}", log_bytes!(remote_last_secret));
+ 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
})
} else {
- log_info!(logger, "Sending a data_loss_protect with no previous remote per_commitment_secret");
+ 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,
/// Adds a pending outbound HTLC to this channel, note that you probably want
/// send_htlc_and_commit instead cause you'll want both messages at once.
- /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
- /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
- /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
- /// You MUST call send_commitment prior to any other calls on this Channel
+ ///
+ /// This returns an optional UpdateAddHTLC as we may be in a state where we cannot add HTLCs on
+ /// the wire:
+ /// * In cases where we're waiting on the remote peer to send us a revoke_and_ack, we
+ /// wouldn't be able to determine what they actually ACK'ed if we have two sets of updates
+ /// awaiting ACK.
+ /// * In cases where we're marked MonitorUpdateFailed, we cannot commit to a new state as we
+ /// may not yet have sent the previous commitment update messages and will need to regenerate
+ /// them.
+ ///
+ /// You MUST call send_commitment prior to calling any other methods on this Channel!
+ ///
/// If an Err is returned, it's a ChannelError::Ignore!
pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> {
if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
return Err(ChannelError::Ignore(format!("Cannot send less than their minimum HTLC value ({})", self.counterparty_htlc_minimum_msat)));
}
- if (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
+ if (self.channel_state & (ChannelState::PeerDisconnected as u32)) != 0 {
// Note that this should never really happen, if we're !is_live() on receipt of an
// incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
// the user to send directly into a !is_live() channel. However, if we
// disconnected during the time the previous hop was doing the commitment dance we may
// end up getting here after the forwarding delay. In any case, returning an
// IgnoreError will get ChannelManager to do the right thing and fail backwards now.
- return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected/frozen for channel monitor update".to_owned()));
+ return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected from channel counterparty".to_owned()));
}
- let (outbound_htlc_count, htlc_outbound_value_msat) = self.get_outbound_pending_htlc_stats();
- if outbound_htlc_count + 1 > self.counterparty_max_accepted_htlcs as u32 {
+ let inbound_stats = self.get_inbound_pending_htlc_stats();
+ let outbound_stats = self.get_outbound_pending_htlc_stats();
+ 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 htlc_outbound_value_msat + amount_msat > self.counterparty_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)));
}
if !self.is_outbound() {
// Check that we won't violate the remote channel reserve by adding this HTLC.
let counterparty_balance_msat = self.channel_value_satoshis * 1000 - self.value_to_self_msat;
- let holder_selected_chan_reserve_msat = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis);
+ let holder_selected_chan_reserve_msat = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(self.channel_value_satoshis) * 1000;
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);
if counterparty_balance_msat < holder_selected_chan_reserve_msat + counterparty_commit_tx_fee_msat {
}
}
- let pending_value_to_self_msat = self.value_to_self_msat - htlc_outbound_value_msat;
+ let exposure_dust_limit_success_sats = (self.get_dust_buffer_feerate() as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000) + 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 = (self.get_dust_buffer_feerate() as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000) + 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 pending_value_to_self_msat = self.value_to_self_msat - outbound_stats.pending_htlcs_value_msat;
if pending_value_to_self_msat < amount_msat {
return Err(ChannelError::Ignore(format!("Cannot send value that would overdraw remaining funds. Amount: {}, pending value to self {}", amount_msat, pending_value_to_self_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);
- 2 * self.next_local_commit_tx_fee_msat(htlc_candidate, Some(()))
+ FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE * self.next_local_commit_tx_fee_msat(htlc_candidate, Some(()))
} else { 0 };
if pending_value_to_self_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 {}", pending_value_to_self_msat, commit_tx_fee_msat)));
// 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 * 1000;
+ let chan_reserve_msat = self.counterparty_selected_channel_reserve_satoshis.unwrap() * 1000;
if pending_value_to_self_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)));
}
// Now update local state:
- if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
+ if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
amount_msat,
payment_hash,
if (self.channel_state & (ChannelState::MonitorUpdateFailed as u32)) == (ChannelState::MonitorUpdateFailed as u32) {
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");
}
- let mut have_updates = self.pending_update_fee.is_some();
+ let mut have_updates = self.is_outbound() && self.pending_update_fee.is_some();
for htlc in self.pending_outbound_htlcs.iter() {
if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
have_updates = true;
}
/// Only fails in case of bad keys
fn send_commitment_no_status_check<L: Deref>(&mut self, logger: &L) -> Result<(msgs::CommitmentSigned, ChannelMonitorUpdate), ChannelError> where L::Target: Logger {
+ log_trace!(logger, "Updating HTLC state for a newly-sent commitment_signed...");
// We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
// fail to generate this, we still are at least at a position where upgrading their status
// is acceptable.
Some(InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info.clone()))
} else { None };
if let Some(state) = new_state {
+ log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to AwaitingAnnouncedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
htlc.state = state;
}
}
if let Some(fail_reason) = if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut fail_reason) = &mut htlc.state {
Some(fail_reason.take())
} else { None } {
+ log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(fail_reason);
}
}
+ if let Some((feerate, update_state)) = self.pending_update_fee {
+ if update_state == FeeUpdateState::AwaitingRemoteRevokeToAnnounce {
+ debug_assert!(!self.is_outbound());
+ log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce fee update {} to Committed", feerate);
+ self.feerate_per_kw = feerate;
+ self.pending_update_fee = None;
+ }
+ }
self.resend_order = RAACommitmentOrder::RevokeAndACKFirst;
let (res, counterparty_commitment_txid, htlcs) = match self.send_commitment_no_state_update(logger) {
/// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
/// when we shouldn't change HTLC/channel state.
fn send_commitment_no_state_update<L: Deref>(&self, logger: &L) -> Result<(msgs::CommitmentSigned, (Txid, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>)), ChannelError> where L::Target: Logger {
- let mut feerate_per_kw = self.feerate_per_kw;
- if let Some(feerate) = self.pending_update_fee {
- if self.is_outbound() {
- feerate_per_kw = feerate;
- }
- }
-
let counterparty_keys = self.build_remote_transaction_keys()?;
- let counterparty_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, true, feerate_per_kw, logger);
+ let counterparty_commitment_tx = self.build_commitment_transaction(self.cur_counterparty_commitment_transaction_number, &counterparty_keys, false, true, logger);
+ let feerate_per_kw = counterparty_commitment_tx.1;
let counterparty_commitment_txid = counterparty_commitment_tx.0.trust().txid();
let (signature, htlc_signatures);
&& info.next_holder_htlc_id == self.next_holder_htlc_id
&& info.next_counterparty_htlc_id == self.next_counterparty_htlc_id
&& info.feerate == self.feerate_per_kw {
- let actual_fee = self.commit_tx_fee_msat(counterparty_commitment_tx.1);
+ let actual_fee = self.commit_tx_fee_msat(counterparty_commitment_tx.2);
assert_eq!(actual_fee, info.fee);
}
}
}
{
- let mut htlcs = Vec::with_capacity(counterparty_commitment_tx.2.len());
- for &(ref htlc, _) in counterparty_commitment_tx.2.iter() {
+ let mut htlcs = Vec::with_capacity(counterparty_commitment_tx.3.len());
+ for &(ref htlc, _) in counterparty_commitment_tx.3.iter() {
htlcs.push(htlc);
}
signature = res.0;
htlc_signatures = res.1;
- log_trace!(logger, "Signed remote commitment tx {} (txid {}) with redeemscript {} -> {}",
+ log_trace!(logger, "Signed remote commitment tx {} (txid {}) with redeemscript {} -> {} in channel {}",
encode::serialize_hex(&counterparty_commitment_tx.0.trust().built_transaction().transaction),
- &counterparty_commitment_txid,
- encode::serialize_hex(&self.get_funding_redeemscript()),
- log_bytes!(signature.serialize_compact()[..]));
+ &counterparty_commitment_txid, encode::serialize_hex(&self.get_funding_redeemscript()),
+ log_bytes!(signature.serialize_compact()[..]), log_bytes!(self.channel_id()));
for (ref htlc_sig, ref htlc) in htlc_signatures.iter().zip(htlcs) {
- log_trace!(logger, "Signed remote HTLC tx {} with redeemscript {} with pubkey {} -> {}",
+ log_trace!(logger, "Signed remote HTLC tx {} with redeemscript {} with pubkey {} -> {} in channel {}",
encode::serialize_hex(&chan_utils::build_htlc_transaction(&counterparty_commitment_txid, feerate_per_kw, self.get_holder_selected_contest_delay(), htlc, &counterparty_keys.broadcaster_delayed_payment_key, &counterparty_keys.revocation_key)),
encode::serialize_hex(&chan_utils::get_htlc_redeemscript(&htlc, &counterparty_keys)),
log_bytes!(counterparty_keys.broadcaster_htlc_key.serialize()),
- log_bytes!(htlc_sig.serialize_compact()[..]));
+ log_bytes!(htlc_sig.serialize_compact()[..]), log_bytes!(self.channel_id()));
}
}
channel_id: self.channel_id,
signature,
htlc_signatures,
- }, (counterparty_commitment_txid, counterparty_commitment_tx.2)))
+ }, (counterparty_commitment_txid, counterparty_commitment_tx.3)))
}
/// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
}
pub fn channel_update(&mut self, msg: &msgs::ChannelUpdate) -> Result<(), ChannelError> {
- let usable_channel_value_msat = (self.channel_value_satoshis - self.counterparty_selected_channel_reserve_satoshis) * 1000;
- if msg.contents.htlc_minimum_msat >= usable_channel_value_msat {
+ if msg.contents.htlc_minimum_msat >= self.channel_value_satoshis * 1000 {
return Err(ChannelError::Close("Minimum htlc value is greater than channel value".to_string()));
}
self.counterparty_forwarding_info = Some(CounterpartyForwardingInfo {
/// Begins the shutdown process, getting a message for the remote peer and returning all
/// holding cell HTLCs for payment failure.
- pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, PaymentHash)>), APIError> {
+ pub fn get_shutdown<K: Deref>(&mut self, keys_provider: &K, their_features: &InitFeatures, target_feerate_sats_per_kw: Option<u32>)
+ -> Result<(msgs::Shutdown, Option<ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), APIError>
+ where K::Target: KeysInterface<Signer = Signer> {
for htlc in self.pending_outbound_htlcs.iter() {
if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
return Err(APIError::APIMisuseError{err: "Cannot begin shutdown with pending HTLCs. Process pending events first".to_owned()});
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 closing_script = self.get_closing_scriptpubkey();
+ let update_shutdown_script = match self.shutdown_scriptpubkey {
+ Some(_) => false,
+ None => {
+ let shutdown_scriptpubkey = keys_provider.get_shutdown_scriptpubkey();
+ if !shutdown_scriptpubkey.is_compatible(their_features) {
+ return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
+ }
+ self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
+ true
+ },
+ };
// From here on out, we may not fail!
+ self.target_closing_feerate_sats_per_kw = target_feerate_sats_per_kw;
if self.channel_state < ChannelState::FundingSent as u32 {
self.channel_state = ChannelState::ShutdownComplete as u32;
} else {
}
self.update_time_counter += 1;
+ let monitor_update = if update_shutdown_script {
+ self.latest_monitor_update_id += 1;
+ Some(ChannelMonitorUpdate {
+ update_id: self.latest_monitor_update_id,
+ updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ }],
+ })
+ } else { None };
+ let shutdown = msgs::Shutdown {
+ channel_id: self.channel_id,
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ };
+
// Go ahead and drop holding cell updates as we'd rather fail payments than wait to send
// our shutdown until we've committed all of the pending changes.
self.holding_cell_update_fee = None;
}
});
- Ok((msgs::Shutdown {
- channel_id: self.channel_id,
- scriptpubkey: closing_script,
- }, dropped_outbound_htlcs))
+ Ok((shutdown, monitor_update, dropped_outbound_htlcs))
}
/// Gets the latest commitment transaction and any dependent transactions for relay (forcing
}
}
-fn is_unsupported_shutdown_script(their_features: &InitFeatures, script: &Script) -> bool {
- // We restrain shutdown scripts to standards forms to avoid transactions not propagating on the p2p tx-relay network
-
- // BOLT 2 says we must only send a scriptpubkey of certain standard forms,
- // which for a a BIP-141-compliant witness program is at max 42 bytes in length.
- // So don't let the remote peer feed us some super fee-heavy script.
- let is_script_too_long = script.len() > 42;
- if is_script_too_long {
- return true;
- }
-
- if their_features.supports_shutdown_anysegwit() && script.is_witness_program() && script.as_bytes()[0] != OP_PUSHBYTES_0.into_u8() {
- return false;
- }
-
- return !script.is_p2pkh() && !script.is_p2sh() && !script.is_v0_p2wpkh() && !script.is_v0_p2wsh()
-}
-
-const SERIALIZATION_VERSION: u8 = 1;
+const SERIALIZATION_VERSION: u8 = 2;
const MIN_SERIALIZATION_VERSION: u8 = 1;
-impl Writeable for InboundHTLCRemovalReason {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
- match self {
- &InboundHTLCRemovalReason::FailRelay(ref error_packet) => {
- 0u8.write(writer)?;
- error_packet.write(writer)?;
- },
- &InboundHTLCRemovalReason::FailMalformed((ref onion_hash, ref err_code)) => {
- 1u8.write(writer)?;
- onion_hash.write(writer)?;
- err_code.write(writer)?;
- },
- &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
- 2u8.write(writer)?;
- payment_preimage.write(writer)?;
- },
- }
- Ok(())
- }
-}
-
-impl Readable for InboundHTLCRemovalReason {
- fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
- Ok(match <u8 as Readable>::read(reader)? {
- 0 => InboundHTLCRemovalReason::FailRelay(Readable::read(reader)?),
- 1 => InboundHTLCRemovalReason::FailMalformed((Readable::read(reader)?, Readable::read(reader)?)),
- 2 => InboundHTLCRemovalReason::Fulfill(Readable::read(reader)?),
- _ => return Err(DecodeError::InvalidValue),
- })
- }
-}
+impl_writeable_tlv_based_enum!(InboundHTLCRemovalReason,;
+ (0, FailRelay),
+ (1, FailMalformed),
+ (2, Fulfill),
+);
impl Writeable for ChannelUpdateStatus {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
// We only care about writing out the current state as it was announced, ie only either
// Enabled or Disabled. In the case of DisabledStaged, we most recently announced the
// channel as enabled, so we write 0. For EnabledStaged, we similarly write a 1.
}
impl Readable for ChannelUpdateStatus {
- fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
+ fn read<R: io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
Ok(match <u8 as Readable>::read(reader)? {
0 => ChannelUpdateStatus::Enabled,
1 => ChannelUpdateStatus::Disabled,
}
impl<Signer: Sign> Writeable for Channel<Signer> {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+ fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
// Note that we write out as if remove_uncommitted_htlcs_and_mark_paused had just been
// called.
write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
self.user_id.write(writer)?;
- self.config.write(writer)?;
+
+ // Write out the old serialization for the config object. This is read by version-1
+ // deserializers, but we will read the version in the TLV at the end instead.
+ self.config.forwarding_fee_proportional_millionths.write(writer)?;
+ self.config.cltv_expiry_delta.write(writer)?;
+ self.config.announced_channel.write(writer)?;
+ self.config.commit_upfront_shutdown_pubkey.write(writer)?;
self.channel_id.write(writer)?;
(self.channel_state | ChannelState::PeerDisconnected as u32).write(writer)?;
(key_data.0.len() as u32).write(writer)?;
writer.write_all(&key_data.0[..])?;
- self.shutdown_pubkey.write(writer)?;
+ // Write out the old serialization for shutdown_pubkey for backwards compatibility, if
+ // deserialized from that format.
+ match self.shutdown_scriptpubkey.as_ref().and_then(|script| script.as_legacy_pubkey()) {
+ Some(shutdown_pubkey) => shutdown_pubkey.write(writer)?,
+ None => [0u8; PUBLIC_KEY_SIZE].write(writer)?,
+ }
self.destination_script.write(writer)?;
self.cur_holder_commitment_transaction_number.write(writer)?;
fail_reason.write(writer)?;
}
- self.pending_update_fee.write(writer)?;
+ if self.is_outbound() {
+ self.pending_update_fee.map(|(a, _)| a).write(writer)?;
+ } else if let Some((feerate, FeeUpdateState::AwaitingRemoteRevokeToAnnounce)) = self.pending_update_fee {
+ // As for inbound HTLCs, if the update was only announced and never committed, drop it.
+ Some(feerate).write(writer)?;
+ } else {
+ None::<u32>.write(writer)?;
+ }
self.holding_cell_update_fee.write(writer)?;
self.next_holder_htlc_id.write(writer)?;
self.update_time_counter.write(writer)?;
self.feerate_per_kw.write(writer)?;
- match self.last_sent_closing_fee {
- Some((feerate, fee, sig)) => {
- 1u8.write(writer)?;
- feerate.write(writer)?;
- fee.write(writer)?;
- sig.write(writer)?;
- },
- None => 0u8.write(writer)?,
- }
+ // Versions prior to 0.0.100 expected to read the fields of `last_sent_closing_fee` here,
+ // however we are supposed to restart shutdown fee negotiation on reconnect (and wipe
+ // `last_send_closing_fee` in `remove_uncommitted_htlcs_and_mark_paused`) so we should never
+ // consider the stale state on reload.
+ 0u8.write(writer)?;
self.funding_tx_confirmed_in.write(writer)?;
self.funding_tx_confirmation_height.write(writer)?;
self.counterparty_dust_limit_satoshis.write(writer)?;
self.holder_dust_limit_satoshis.write(writer)?;
self.counterparty_max_htlc_value_in_flight_msat.write(writer)?;
- self.counterparty_selected_channel_reserve_satoshis.write(writer)?;
+
+ // Note that this field is ignored by 0.0.99+ as the TLV Optional variant is used instead.
+ self.counterparty_selected_channel_reserve_satoshis.unwrap_or(0).write(writer)?;
+
self.counterparty_htlc_minimum_msat.write(writer)?;
self.holder_htlc_minimum_msat.write(writer)?;
self.counterparty_max_accepted_htlcs.write(writer)?;
- self.minimum_depth.write(writer)?;
+
+ // Note that this field is ignored by 0.0.99+ as the TLV Optional variant is used instead.
+ self.minimum_depth.unwrap_or(0).write(writer)?;
match &self.counterparty_forwarding_info {
Some(info) => {
self.channel_update_status.write(writer)?;
- write_tlv_fields!(writer, {}, {(0, self.announcement_sigs)});
+ #[cfg(any(test, feature = "fuzztarget"))]
+ (self.historical_inbound_htlc_fulfills.len() as u64).write(writer)?;
+ #[cfg(any(test, feature = "fuzztarget"))]
+ for htlc in self.historical_inbound_htlc_fulfills.iter() {
+ htlc.write(writer)?;
+ }
+
+ write_tlv_fields!(writer, {
+ (0, self.announcement_sigs, option),
+ // minimum_depth and counterparty_selected_channel_reserve_satoshis used to have a
+ // default value instead of being Option<>al. Thus, to maintain compatibility we write
+ // them twice, once with their original default values above, and once as an option
+ // here. On the read side, old versions will simply ignore the odd-type entries here,
+ // and new versions map the default values to None and allow the TLV entries here to
+ // override that.
+ (1, self.minimum_depth, option),
+ (3, self.counterparty_selected_channel_reserve_satoshis, option),
+ (5, self.config, required),
+ (7, self.shutdown_scriptpubkey, option),
+ (9, self.target_closing_feerate_sats_per_kw, option),
+ });
Ok(())
}
const MAX_ALLOC_SIZE: usize = 64*1024;
impl<'a, Signer: Sign, K: Deref> ReadableArgs<&'a K> for Channel<Signer>
where K::Target: KeysInterface<Signer = Signer> {
- fn read<R : ::std::io::Read>(reader: &mut R, keys_source: &'a K) -> Result<Self, DecodeError> {
- let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
+ fn read<R : io::Read>(reader: &mut R, keys_source: &'a K) -> Result<Self, DecodeError> {
+ let ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
let user_id = Readable::read(reader)?;
- let config: ChannelConfig = Readable::read(reader)?;
+
+ let mut config = Some(ChannelConfig::default());
+ if ver == 1 {
+ // Read the old serialization of the ChannelConfig from version 0.0.98.
+ config.as_mut().unwrap().forwarding_fee_proportional_millionths = Readable::read(reader)?;
+ config.as_mut().unwrap().cltv_expiry_delta = Readable::read(reader)?;
+ config.as_mut().unwrap().announced_channel = Readable::read(reader)?;
+ config.as_mut().unwrap().commit_upfront_shutdown_pubkey = Readable::read(reader)?;
+ } else {
+ // Read the 8 bytes of backwards-compatibility ChannelConfig data.
+ let mut _val: u64 = Readable::read(reader)?;
+ }
let channel_id = Readable::read(reader)?;
let channel_state = Readable::read(reader)?;
}
let holder_signer = keys_source.read_chan_signer(&keys_data)?;
- let shutdown_pubkey = Readable::read(reader)?;
+ // Read the old serialization for shutdown_pubkey, preferring the TLV field later if set.
+ let mut shutdown_scriptpubkey = match <PublicKey as Readable>::read(reader) {
+ Ok(pubkey) => Some(ShutdownScript::new_p2wpkh_from_pubkey(pubkey)),
+ Err(_) => None,
+ };
let destination_script = Readable::read(reader)?;
let cur_holder_commitment_transaction_number = Readable::read(reader)?;
monitor_pending_failures.push((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?));
}
- let pending_update_fee = Readable::read(reader)?;
+ let pending_update_fee_value: Option<u32> = Readable::read(reader)?;
+
let holding_cell_update_fee = Readable::read(reader)?;
let next_holder_htlc_id = Readable::read(reader)?;
let update_time_counter = Readable::read(reader)?;
let feerate_per_kw = Readable::read(reader)?;
- let last_sent_closing_fee = match <u8 as Readable>::read(reader)? {
- 0 => None,
- 1 => Some((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?)),
+ // Versions prior to 0.0.100 expected to read the fields of `last_sent_closing_fee` here,
+ // however we are supposed to restart shutdown fee negotiation on reconnect (and wipe
+ // `last_send_closing_fee` in `remove_uncommitted_htlcs_and_mark_paused`) so we should never
+ // consider the stale state on reload.
+ match <u8 as Readable>::read(reader)? {
+ 0 => {},
+ 1 => {
+ let _: u32 = Readable::read(reader)?;
+ let _: u64 = Readable::read(reader)?;
+ let _: Signature = Readable::read(reader)?;
+ },
_ => return Err(DecodeError::InvalidValue),
- };
+ }
let funding_tx_confirmed_in = Readable::read(reader)?;
let funding_tx_confirmation_height = Readable::read(reader)?;
let counterparty_dust_limit_satoshis = Readable::read(reader)?;
let holder_dust_limit_satoshis = Readable::read(reader)?;
let counterparty_max_htlc_value_in_flight_msat = Readable::read(reader)?;
- let counterparty_selected_channel_reserve_satoshis = Readable::read(reader)?;
+ let mut counterparty_selected_channel_reserve_satoshis = None;
+ if ver == 1 {
+ // Read the old serialization from version 0.0.98.
+ counterparty_selected_channel_reserve_satoshis = Some(Readable::read(reader)?);
+ } else {
+ // Read the 8 bytes of backwards-compatibility data.
+ let _dummy: u64 = Readable::read(reader)?;
+ }
let counterparty_htlc_minimum_msat = Readable::read(reader)?;
let holder_htlc_minimum_msat = Readable::read(reader)?;
let counterparty_max_accepted_htlcs = Readable::read(reader)?;
- let minimum_depth = Readable::read(reader)?;
+
+ let mut minimum_depth = None;
+ if ver == 1 {
+ // Read the old serialization from version 0.0.98.
+ minimum_depth = Some(Readable::read(reader)?);
+ } else {
+ // Read the 4 bytes of backwards-compatibility data.
+ let _dummy: u32 = Readable::read(reader)?;
+ }
let counterparty_forwarding_info = match <u8 as Readable>::read(reader)? {
0 => None,
_ => return Err(DecodeError::InvalidValue),
};
- let channel_parameters = Readable::read(reader)?;
+ let channel_parameters: ChannelTransactionParameters = Readable::read(reader)?;
let funding_transaction = Readable::read(reader)?;
let counterparty_cur_commitment_point = Readable::read(reader)?;
let channel_update_status = Readable::read(reader)?;
+ #[cfg(any(test, feature = "fuzztarget"))]
+ let mut historical_inbound_htlc_fulfills = HashSet::new();
+ #[cfg(any(test, feature = "fuzztarget"))]
+ {
+ let htlc_fulfills_len: u64 = Readable::read(reader)?;
+ for _ in 0..htlc_fulfills_len {
+ assert!(historical_inbound_htlc_fulfills.insert(Readable::read(reader)?));
+ }
+ }
+
+ let pending_update_fee = if let Some(feerate) = pending_update_fee_value {
+ Some((feerate, if channel_parameters.is_outbound_from_holder {
+ FeeUpdateState::Outbound
+ } else {
+ FeeUpdateState::AwaitingRemoteRevokeToAnnounce
+ }))
+ } else {
+ None
+ };
+
let mut announcement_sigs = None;
- read_tlv_fields!(reader, {}, {(0, announcement_sigs)});
+ let mut target_closing_feerate_sats_per_kw = None;
+ read_tlv_fields!(reader, {
+ (0, announcement_sigs, option),
+ (1, minimum_depth, option),
+ (3, counterparty_selected_channel_reserve_satoshis, option),
+ (5, config, option), // Note that if none is provided we will *not* overwrite the existing one.
+ (7, shutdown_scriptpubkey, option),
+ (9, target_closing_feerate_sats_per_kw, option),
+ });
let mut secp_ctx = Secp256k1::new();
secp_ctx.seeded_randomize(&keys_source.get_secure_random_bytes());
Ok(Channel {
user_id,
- config,
+ config: config.unwrap(),
channel_id,
channel_state,
secp_ctx,
latest_monitor_update_id,
holder_signer,
- shutdown_pubkey,
+ shutdown_scriptpubkey,
destination_script,
cur_holder_commitment_transaction_number,
feerate_per_kw,
#[cfg(debug_assertions)]
- holder_max_commitment_tx_output: ::std::sync::Mutex::new((0, 0)),
+ holder_max_commitment_tx_output: Mutex::new((0, 0)),
#[cfg(debug_assertions)]
- counterparty_max_commitment_tx_output: ::std::sync::Mutex::new((0, 0)),
+ counterparty_max_commitment_tx_output: Mutex::new((0, 0)),
- last_sent_closing_fee,
+ last_sent_closing_fee: None,
+ pending_counterparty_closing_signed: None,
+ closing_fee_limits: None,
+ target_closing_feerate_sats_per_kw,
funding_tx_confirmed_in,
funding_tx_confirmation_height,
commitment_secrets,
channel_update_status,
+ closing_signed_in_flight: false,
announcement_sigs,
next_local_commitment_tx_fee_info_cached: Mutex::new(None),
#[cfg(any(test, feature = "fuzztarget"))]
next_remote_commitment_tx_fee_info_cached: Mutex::new(None),
+
+ workaround_lnd_bug_4006: None,
+
+ #[cfg(any(test, feature = "fuzztarget"))]
+ historical_inbound_htlc_fulfills,
})
}
}
use bitcoin::hashes::hex::FromHex;
use hex;
use ln::{PaymentPreimage, PaymentHash};
- use ln::channelmanager::{BestBlock, HTLCSource};
+ use ln::channelmanager::HTLCSource;
use ln::channel::{Channel,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,HTLCCandidate,HTLCInitiator,TxCreationKeys};
use ln::channel::MAX_FUNDING_SATOSHIS;
use ln::features::InitFeatures;
use ln::msgs::{ChannelUpdate, DataLossProtect, DecodeError, OptionalField, UnsignedChannelUpdate};
+ use ln::script::ShutdownScript;
use ln::chan_utils;
use ln::chan_utils::{ChannelPublicKeys, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters, HTLC_SUCCESS_TX_WEIGHT, HTLC_TIMEOUT_TX_WEIGHT};
+ use chain::BestBlock;
use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
use chain::keysinterface::{InMemorySigner, KeysInterface, BaseSign};
use chain::transaction::OutPoint;
use util::config::UserConfig;
use util::enforcing_trait_impls::EnforcingSigner;
+ use util::errors::APIError;
use util::test_utils;
+ use util::test_utils::OnGetShutdownScriptpubkey;
use util::logger::Logger;
use bitcoin::secp256k1::{Secp256k1, Message, Signature, All};
use bitcoin::secp256k1::ffi::Signature as FFISignature;
use bitcoin::hashes::sha256::Hash as Sha256;
use bitcoin::hashes::Hash;
use bitcoin::hash_types::{Txid, WPubkeyHash};
- use std::sync::Arc;
+ use core::num::NonZeroU8;
+ use sync::Arc;
use prelude::*;
struct TestFeeEstimator {
Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script()
}
- fn get_shutdown_pubkey(&self) -> PublicKey {
+ fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
let secp_ctx = Secp256k1::signing_only();
let channel_close_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
- PublicKey::from_secret_key(&secp_ctx, &channel_close_key)
+ ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key))
}
fn get_channel_signer(&self, _inbound: bool, _channel_value_satoshis: u64) -> InMemorySigner {
PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode(hex).unwrap()[..]).unwrap())
}
+ #[test]
+ fn upfront_shutdown_script_incompatibility() {
+ let features = InitFeatures::known().clear_shutdown_anysegwit();
+ let non_v0_segwit_shutdown_script =
+ ShutdownScript::new_witness_program(NonZeroU8::new(16).unwrap(), &[0, 40]).unwrap();
+
+ let seed = [42; 32];
+ let network = Network::Testnet;
+ let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
+ keys_provider.expect(OnGetShutdownScriptpubkey {
+ returns: non_v0_segwit_shutdown_script.clone(),
+ });
+
+ let fee_estimator = TestFeeEstimator { fee_est: 253 };
+ let secp_ctx = Secp256k1::new();
+ let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
+ let config = UserConfig::default();
+ match Channel::<EnforcingSigner>::new_outbound(&&fee_estimator, &&keys_provider, node_id, &features, 10000000, 100000, 42, &config) {
+ Err(APIError::IncompatibleShutdownScript { script }) => {
+ assert_eq!(script.into_inner(), non_v0_segwit_shutdown_script.into_inner());
+ },
+ Err(e) => panic!("Unexpected error: {:?}", e),
+ Ok(_) => panic!("Expected error"),
+ }
+ }
+
// Check that, during channel creation, we use the same feerate in the open channel message
// as we do in the Channel object creation itself.
#[test]
let node_a_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let config = UserConfig::default();
- let node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_a_node_id, 10000000, 100000, 42, &config).unwrap();
+ let node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_a_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config).unwrap();
// Now change the fee so we can check that the fee in the open_channel message is the
// same as the old fee.
// Create Node A's channel pointing to Node B's pubkey
let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let config = UserConfig::default();
- let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, 10000000, 100000, 42, &config).unwrap();
+ let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config).unwrap();
// Create Node B's channel by receiving Node A's open_channel message
// Make sure A's dust limit is as we expect.
let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
- let node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, InitFeatures::known(), &open_channel_msg, 7, &config).unwrap();
+ let node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), &open_channel_msg, 7, &config).unwrap();
// Node B --> Node A: accept channel, explicitly setting B's dust limit.
let mut accept_channel_msg = node_b_chan.get_accept_channel();
accept_channel_msg.dust_limit_satoshis = 546;
- node_a_chan.accept_channel(&accept_channel_msg, &config, InitFeatures::known()).unwrap();
+ node_a_chan.accept_channel(&accept_channel_msg, &config, &InitFeatures::known()).unwrap();
node_a_chan.holder_dust_limit_satoshis = 1560;
// Put some inbound and outbound HTLCs in A's channel.
let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let config = UserConfig::default();
- let mut chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_id, 10000000, 100000, 42, &config).unwrap();
+ let mut chan = Channel::<EnforcingSigner>::new_outbound(&&fee_est, &&keys_provider, node_id, &InitFeatures::known(), 10000000, 100000, 42, &config).unwrap();
let commitment_tx_fee_0_htlcs = chan.commit_tx_fee_msat(0);
let commitment_tx_fee_1_htlc = chan.commit_tx_fee_msat(1);
// Create Node A's channel pointing to Node B's pubkey
let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let config = UserConfig::default();
- let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, 10000000, 100000, 42, &config).unwrap();
+ let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config).unwrap();
// Create Node B's channel by receiving Node A's open_channel message
let open_channel_msg = node_a_chan.get_open_channel(chain_hash);
let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
- let mut node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, InitFeatures::known(), &open_channel_msg, 7, &config).unwrap();
+ let mut node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), &open_channel_msg, 7, &config).unwrap();
// Node B --> Node A: accept channel
let accept_channel_msg = node_b_chan.get_accept_channel();
- node_a_chan.accept_channel(&accept_channel_msg, &config, InitFeatures::known()).unwrap();
+ node_a_chan.accept_channel(&accept_channel_msg, &config, &InitFeatures::known()).unwrap();
// Node A --> Node B: funding created
let output_script = node_a_chan.get_funding_redeemscript();
// Create a channel.
let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let config = UserConfig::default();
- let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, 10000000, 100000, 42, &config).unwrap();
+ let mut node_a_chan = Channel::<EnforcingSigner>::new_outbound(&&feeest, &&keys_provider, node_b_node_id, &InitFeatures::known(), 10000000, 100000, 42, &config).unwrap();
assert!(node_a_chan.counterparty_forwarding_info.is_none());
assert_eq!(node_a_chan.holder_htlc_minimum_msat, 1); // the default
assert!(node_a_chan.counterparty_forwarding_info().is_none());
let counterparty_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
let mut config = UserConfig::default();
config.channel_options.announced_channel = false;
- let mut chan = Channel::<InMemorySigner>::new_outbound(&&feeest, &&keys_provider, counterparty_node_id, 10_000_000, 100000, 42, &config).unwrap(); // Nothing uses their network key in this test
+ let mut chan = Channel::<InMemorySigner>::new_outbound(&&feeest, &&keys_provider, counterparty_node_id, &InitFeatures::known(), 10_000_000, 100000, 42, &config).unwrap(); // Nothing uses their network key in this test
chan.holder_dust_limit_satoshis = 546;
+ chan.counterparty_selected_channel_reserve_satoshis = Some(0); // Filled in in accept_channel
let funding_info = OutPoint{ txid: Txid::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), index: 0 };
$( { $htlc_idx: expr, $counterparty_htlc_sig_hex: expr, $htlc_sig_hex: expr, $htlc_tx_hex: expr } ), *
} ) => { {
let (commitment_tx, htlcs): (_, Vec<HTLCOutputInCommitment>) = {
- let mut res = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, chan.feerate_per_kw, &logger);
+ let mut res = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, &logger);
- let htlcs = res.2.drain(..)
+ let htlcs = res.3.drain(..)
.filter_map(|(htlc, _)| if htlc.transaction_output_index.is_some() { Some(htlc) } else { None })
.collect();
(res.0, htlcs)
let remote_signature = Signature::from_der(&hex::decode($counterparty_htlc_sig_hex).unwrap()[..]).unwrap();
let ref htlc = htlcs[$htlc_idx];
- let htlc_tx = chan.build_htlc_transaction(&unsigned_tx.txid, &htlc, true, &keys, chan.feerate_per_kw);
+ let htlc_tx = chan_utils::build_htlc_transaction(&unsigned_tx.txid, chan.feerate_per_kw,
+ chan.get_counterparty_selected_contest_delay().unwrap(),
+ &htlc, &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
let htlc_sighash = Message::from_slice(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, SigHashType::All)[..]).unwrap();
secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.countersignatory_htlc_key).unwrap();
projects / rust-lightning / blobdiff