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 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 cltv_expiry_delta: u16,
}
+/// A return value enum for get_update_fulfill_htlc. See UpdateFulfillCommitFetch variants for
+/// description
+enum UpdateFulfillFetch {
+ NewClaim {
+ monitor_update: ChannelMonitorUpdate,
+ 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 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 {},
+}
+
// 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
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
#[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<(u32, u64, Signature)>, // (feerate, fee, holder_sig)
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>,
///
/// 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;
}
// 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::APIMisuseError { err: format!("Provided a scriptpubkey format not accepted by peer. script: ({})", shutdown_scriptpubkey.clone().into_inner().to_bytes().to_hex()) });
+ }
+ }
+
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,
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,
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(),
})
}
// 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 a non-accepted scriptpubkey format. script: ({})", script.to_bytes().to_hex()))),
+ }
}
},
// 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. script: ({})", shutdown_scriptpubkey.clone().into_inner().to_bytes().to_hex())));
+ }
+ }
+
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,
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,
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)
} 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);
#[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()
+ self.shutdown_scriptpubkey.clone().unwrap().into_inner()
}
#[inline]
}, ()));
}
+ 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,
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");
}
}
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, msg: None };
}
},
_ => {}
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, 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, msg: None };
}
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,
+ 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, 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, msgs: Some((update_fulfill_htlc, commitment)) })
},
- (None, Some(monitor_update)) => Ok((None, Some(monitor_update))),
- (None, None) => Ok((None, None))
+ UpdateFulfillFetch::NewClaim { monitor_update, msg: None } => Ok(UpdateFulfillCommitFetch::NewClaim { monitor_update, 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, .. } => {
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 a non-accepted scriptpubkey format. script: ({})", script.to_bytes().to_hex()))),
+ }
}
},
// 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_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,
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,
/// 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().1 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().1 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.
// 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()));
}
}
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 {} in channel {}.",
}
},
&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 {
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(),
if self.feerate_per_kw > proposed_feerate {
proposed_feerate = self.feerate_per_kw;
}
+ assert!(self.shutdown_scriptpubkey.is_some());
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;
})
}
- 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<F: Deref, K: Deref>(
+ &mut self, fee_estimator: &F, keys_provider: &K, their_features: &InitFeatures, msg: &msgs::Shutdown
+ ) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Option<ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), ChannelError>
+ where
+ F::Target: FeeEstimator,
+ 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 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 send_shutdown = (self.channel_state & ChannelState::LocalShutdownSent as u32) != ChannelState::LocalShutdownSent as u32;
+
+ let shutdown_scriptpubkey = match self.shutdown_scriptpubkey {
+ Some(_) => None,
+ 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. script: ({})", shutdown_scriptpubkey.clone().into_inner().to_bytes().to_hex())));
+ }
+ Some(shutdown_scriptpubkey)
+ },
+ };
+
// From here on out, we may not fail!
self.channel_state |= ChannelState::RemoteShutdownSent as u32;
_ => 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 {
+ let monitor_update = match shutdown_scriptpubkey {
+ Some(shutdown_scriptpubkey) => {
+ self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
+ self.latest_monitor_update_id += 1;
+ Some(ChannelMonitorUpdate {
+ update_id: self.latest_monitor_update_id,
+ updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ }],
+ })
+ },
+ None => None,
+ };
+ let shutdown = if send_shutdown {
Some(msgs::Shutdown {
channel_id: self.channel_id,
scriptpubkey: self.get_closing_scriptpubkey(),
})
- };
+ } else { None };
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, self.maybe_propose_first_closing_signed(fee_estimator), monitor_update, dropped_outbound_htlcs))
}
fn build_signed_closing_transaction(&self, tx: &mut Transaction, counterparty_sig: &Signature, sig: &Signature) {
macro_rules! propose_new_feerate {
($new_feerate: expr) => {
+ assert!(self.shutdown_scriptpubkey.is_some());
let tx_weight = self.get_closing_transaction_weight(Some(&self.get_closing_scriptpubkey()), Some(self.counterparty_shutdown_scriptpubkey.as_ref().unwrap()));
let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate as u64 * tx_weight / 1000, false);
let sig = self.holder_signer
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 {
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
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;
}
// 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),
});
}
}
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 !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 {
// 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)));
}
}
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) -> 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 shutdown_scriptpubkey = match self.shutdown_scriptpubkey {
+ Some(_) => None,
+ None => {
+ let shutdown_scriptpubkey = keys_provider.get_shutdown_scriptpubkey();
+ if !shutdown_scriptpubkey.is_compatible(their_features) {
+ return Err(APIError::APIMisuseError { err: format!("Provided a scriptpubkey format not accepted by peer. script: ({})", shutdown_scriptpubkey.clone().into_inner().to_bytes().to_hex()) });
+ }
+ Some(shutdown_scriptpubkey)
+ },
+ };
+
+ let monitor_update = match shutdown_scriptpubkey {
+ Some(shutdown_scriptpubkey) => {
+ self.shutdown_scriptpubkey = Some(shutdown_scriptpubkey);
+ self.latest_monitor_update_id += 1;
+ Some(ChannelMonitorUpdate {
+ update_id: self.latest_monitor_update_id,
+ updates: vec![ChannelMonitorUpdateStep::ShutdownScript {
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ }],
+ })
+ },
+ None => None,
+ };
// From here on out, we may not fail!
if self.channel_state < ChannelState::FundingSent as u32 {
Ok((msgs::Shutdown {
channel_id: self.channel_id,
- scriptpubkey: closing_script,
- }, dropped_outbound_htlcs))
+ scriptpubkey: self.get_closing_scriptpubkey(),
+ }, 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_tlv_based_enum!(InboundHTLCRemovalReason,;
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)?;
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, option)});
+ #[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),
+ });
Ok(())
}
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);
+ 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 it for shutdown_scriptpubkey
+ // over the TLV if valid.
+ 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)?;
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,
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 mut announcement_sigs = None;
- read_tlv_fields!(reader, {(0, announcement_sigs, option)});
+ 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),
+ });
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,
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 bitcoin::hashes::sha256::Hash as Sha256;
use bitcoin::hashes::Hash;
use bitcoin::hash_types::{Txid, WPubkeyHash};
- use std::sync::Arc;
+ 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 {
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 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);
// 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 };
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