Few random fixes

src/chain/chaininterface.rs

@@ -25,11 +25,9 @@ pub trait ChainWatchInterface: Sync + Send {
 	//TODO: unregister
 }
 
-/// An interface to send a transaction to connected Bitcoin peers.
-/// This is for final settlement. An error might indicate that no peers can be reached or
-/// that peers rejected the transaction.
+/// An interface to send a transaction to the Bitcoin network.
 pub trait BroadcasterInterface: Sync + Send {
-	/// Sends a transaction out to (hopefully) be mined
+	/// Sends a transaction out to (hopefully) be mined.
 	fn broadcast_transaction(&self, tx: &Transaction);
 }
 
@@ -105,8 +103,9 @@ impl ChainWatchInterfaceUtil {
 		}
 	}
 
-	/// notify listener that a block was connected
-	/// notification will repeat if notified listener register new listeners
+	/// Notify listeners that a block was connected.
+	/// Handles re-scanning the block and calling block_connected again if listeners register new
+	/// watch data during the callbacks for you (see ChainListener::block_connected for more info).
 	pub fn block_connected_with_filtering(&self, block: &Block, height: u32) {
 		let mut reentered = true;
 		while reentered {
@@ -125,7 +124,7 @@ impl ChainWatchInterfaceUtil {
 		}
 	}
 
-	/// notify listener that a block was disconnected
+	/// Notify listeners that a block was disconnected.
 	pub fn block_disconnected(&self, header: &BlockHeader) {
 		let listeners = self.listeners.lock().unwrap().clone();
 		for listener in listeners.iter() {
@@ -136,8 +135,10 @@ impl ChainWatchInterfaceUtil {
 		}
 	}
 
-	/// call listeners for connected blocks if they are still around.
-	/// returns true if notified listeners registered additional listener
+	/// Notify listeners that a block was connected.
+	/// Returns true if notified listeners registered additional watch data (implying that the
+	/// block must be re-scanned and this function called again prior to further block_connected
+	/// calls, see ChainListener::block_connected for more info).
 	pub fn block_connected_checked(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> bool {
 		let last_seen = self.reentered.load(Ordering::Relaxed);
 
@@ -151,7 +152,7 @@ impl ChainWatchInterfaceUtil {
 		return last_seen != self.reentered.load(Ordering::Relaxed);
 	}
 
-	/// Checks if a given transaction matches the current filter
+	/// Checks if a given transaction matches the current filter.
 	pub fn does_match_tx(&self, tx: &Transaction) -> bool {
 		let watched = self.watched.lock().unwrap();
 		self.does_match_tx_unguarded (tx, &watched)

src/ln/channel.rs

@@ -374,7 +374,7 @@ impl Channel {
 		if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 			return Err(HandleError{err: "Minimum htlc value is full channel value", msg: None});
 		}
-		Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw).unwrap();
+		Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
 		if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
 			return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: None});
 		}

src/ln/channelmanager.rs

@@ -1211,6 +1211,7 @@ impl ChannelMessageHandler for ChannelManager {
 
 #[cfg(test)]
 mod tests {
+	use chain::chaininterface;
 	use ln::channelmanager::{ChannelManager,OnionKeys};
 	use ln::router::{Route, RouteHop, Router};
 	use ln::msgs;
@@ -1389,17 +1390,17 @@ mod tests {
 	}
 
 	static mut CHAN_COUNT: u16 = 0;
-	fn confirm_transaction(chain: &test_utils::TestWatchInterface, tx: &Transaction) {
+	fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction) {
 		let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 		let chan_id = unsafe { CHAN_COUNT };
-		chain.watch_util.block_connected_checked(&header, 1, &[tx; 1], &[chan_id as u32; 1]);
+		chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id as u32; 1]);
 		for i in 2..100 {
 			header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
-			chain.watch_util.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
+			chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
 		}
 	}
 
-	fn create_chan_between_nodes(node_a: &ChannelManager, chain_a: &test_utils::TestWatchInterface, node_b: &ChannelManager, chain_b: &test_utils::TestWatchInterface) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate) {
+	fn create_chan_between_nodes(node_a: &ChannelManager, chain_a: &chaininterface::ChainWatchInterfaceUtil, node_b: &ChannelManager, chain_b: &chaininterface::ChainWatchInterfaceUtil) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate) {
 		let open_chan = node_a.create_channel(node_b.get_our_node_id(), (1 << 24) - 1, 42).unwrap();
 		let accept_chan = node_b.handle_open_channel(&node_a.get_our_node_id(), &open_chan).unwrap();
 		node_a.handle_accept_channel(&node_b.get_our_node_id(), &accept_chan).unwrap();
@@ -1615,7 +1616,7 @@ mod tests {
 		let secp_ctx = Secp256k1::new();
 
 		let feeest_1 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
-		let chain_monitor_1 = Arc::new(test_utils::TestWatchInterface::new());
+		let chain_monitor_1 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
 		let chan_monitor_1 = Arc::new(test_utils::TestChannelMonitor{});
 		let node_id_1 = {
 			let mut key_slice = [0; 32];
@@ -1626,7 +1627,7 @@ mod tests {
 		let router_1 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_1).unwrap());
 
 		let feeest_2 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
-		let chain_monitor_2 = Arc::new(test_utils::TestWatchInterface::new());
+		let chain_monitor_2 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
 		let chan_monitor_2 = Arc::new(test_utils::TestChannelMonitor{});
 		let node_id_2 = {
 			let mut key_slice = [0; 32];
@@ -1637,7 +1638,7 @@ mod tests {
 		let router_2 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_2).unwrap());
 
 		let feeest_3 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
-		let chain_monitor_3 = Arc::new(test_utils::TestWatchInterface::new());
+		let chain_monitor_3 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
 		let chan_monitor_3 = Arc::new(test_utils::TestChannelMonitor{});
 		let node_id_3 = {
 			let mut key_slice = [0; 32];
@@ -1648,7 +1649,7 @@ mod tests {
 		let router_3 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_3).unwrap());
 
 		let feeest_4 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
-		let chain_monitor_4 = Arc::new(test_utils::TestWatchInterface::new());
+		let chain_monitor_4 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
 		let chan_monitor_4 = Arc::new(test_utils::TestChannelMonitor{});
 		let node_id_4 = {
 			let mut key_slice = [0; 32];

src/ln/channelmonitor.rs

@@ -456,7 +456,7 @@ impl ChannelMonitor {
 			for txin in tx.input.iter() {
 				if self.funding_txo.is_none() || (txin.prev_hash == self.funding_txo.unwrap().0 && txin.prev_index == self.funding_txo.unwrap().1 as u32) {
 					for tx in self.check_spend_transaction(tx, height).iter() {
-						broadcaster.broadcast_transaction(tx); // TODO: use result
+						broadcaster.broadcast_transaction(tx);
 					}
 				}
 			}

src/ln/msgs.rs

@@ -20,6 +20,8 @@ pub enum DecodeError {
 	UnknownRealmByte,
 	/// Failed to decode a public key (ie it's invalid)
 	BadPublicKey,
+	/// Failed to decode a signature (ie it's invalid)
+	BadSignature,
 	/// Buffer not of right length (either too short or too long)
 	WrongLength,
 }
@@ -408,6 +410,7 @@ impl Error for DecodeError {
 		match *self {
 			DecodeError::UnknownRealmByte => "Unknown realm byte in Onion packet",
 			DecodeError::BadPublicKey => "Invalid public key in packet",
+			DecodeError::BadSignature => "Invalid signature in packet",
 			DecodeError::WrongLength => "Data was wrong length for packet",
 		}
 	}
@@ -433,11 +436,20 @@ macro_rules! secp_pubkey {
 	};
 }
 
+macro_rules! secp_signature {
+	( $ctx: expr, $slice: expr ) => {
+		match Signature::from_compact($ctx, $slice) {
+			Ok(sig) => sig,
+			Err(_) => return Err(DecodeError::BadSignature)
+		}
+	};
+}
+
 impl MsgDecodable for LocalFeatures {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 		if v.len() < 3 { return Err(DecodeError::WrongLength); }
 		let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
-		if v.len() != len + 2 { return Err(DecodeError::WrongLength); }
+		if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 		let mut flags = Vec::with_capacity(len);
 		flags.extend_from_slice(&v[2..]);
 		Ok(Self {
@@ -458,7 +470,7 @@ impl MsgDecodable for GlobalFeatures {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 		if v.len() < 3 { return Err(DecodeError::WrongLength); }
 		let len = byte_utils::slice_to_be16(&v[0..2]) as usize;
-		if v.len() != len + 2 { return Err(DecodeError::WrongLength); }
+		if v.len() < len + 2 { return Err(DecodeError::WrongLength); }
 		let mut flags = Vec::with_capacity(len);
 		flags.extend_from_slice(&v[2..]);
 		Ok(Self {
@@ -478,13 +490,10 @@ impl MsgEncodable for GlobalFeatures {
 impl MsgDecodable for Init {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
 		let global_features = GlobalFeatures::decode(v)?;
-		if global_features.flags.len() + 4 <= v.len() {
+		if v.len() < global_features.flags.len() + 4 {
 			return Err(DecodeError::WrongLength);
 		}
 		let local_features = LocalFeatures::decode(&v[global_features.flags.len() + 2..])?;
-		if global_features.flags.len() + local_features.flags.len() + 4 != v.len() {
-			return Err(DecodeError::WrongLength);
-		}
 		Ok(Self {
 			global_features: global_features,
 			local_features: local_features,
@@ -502,24 +511,20 @@ impl MsgEncodable for Init {
 
 impl MsgDecodable for OpenChannel {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
-		if v.len() != 2*32+6*8+4+2*2+6*33+1 {
+		if v.len() < 2*32+6*8+4+2*2+6*33+1 {
 			return Err(DecodeError::WrongLength);
 		}
 		let ctx = Secp256k1::without_caps();
-		let funding_pubkey = secp_pubkey!(&ctx, &v[120..153]);
-		let revocation_basepoint = secp_pubkey!(&ctx, &v[153..186]);
-		let payment_basepoint = secp_pubkey!(&ctx, &v[186..219]);
-		let delayed_payment_basepoint = secp_pubkey!(&ctx, &v[219..252]);
-		let htlc_basepoint = secp_pubkey!(&ctx, &v[252..285]);
-		let first_per_commitment_point = secp_pubkey!(&ctx, &v[285..318]);
 
 		let mut shutdown_scriptpubkey = None;
 		if v.len() >= 321 {
 			let len = byte_utils::slice_to_be16(&v[319..321]) as usize;
-			if v.len() != 321+len {
+			if v.len() < 321+len {
 				return Err(DecodeError::WrongLength);
 			}
 			shutdown_scriptpubkey = Some(Script::from(v[321..321+len].to_vec()));
+		} else if v.len() != 2*32+6*8+4+2*2+6*33+1 { // Message cant have 1 extra byte
+			return Err(DecodeError::WrongLength);
 		}
 
 		Ok(OpenChannel {
@@ -534,12 +539,12 @@ impl MsgDecodable for OpenChannel {
 			feerate_per_kw: byte_utils::slice_to_be32(&v[112..116]),
 			to_self_delay: byte_utils::slice_to_be16(&v[116..118]),
 			max_accepted_htlcs: byte_utils::slice_to_be16(&v[118..120]),
-			funding_pubkey: funding_pubkey,
-			revocation_basepoint: revocation_basepoint,
-			payment_basepoint: payment_basepoint,
-			delayed_payment_basepoint: delayed_payment_basepoint,
-			htlc_basepoint: htlc_basepoint,
-			first_per_commitment_point: first_per_commitment_point,
+			funding_pubkey: secp_pubkey!(&ctx, &v[120..153]),
+			revocation_basepoint: secp_pubkey!(&ctx, &v[153..186]),
+			payment_basepoint: secp_pubkey!(&ctx, &v[186..219]),
+			delayed_payment_basepoint: secp_pubkey!(&ctx, &v[219..252]),
+			htlc_basepoint: secp_pubkey!(&ctx, &v[252..285]),
+			first_per_commitment_point: secp_pubkey!(&ctx, &v[285..318]),
 			channel_flags: v[318],
 			shutdown_scriptpubkey: shutdown_scriptpubkey
 		})
@@ -551,10 +556,41 @@ impl MsgEncodable for OpenChannel {
 	}
 }
 
-
 impl MsgDecodable for AcceptChannel {
-	fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
-		unimplemented!();
+	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
+		if v.len() < 32+4*8+4+2*2+6*33 {
+			return Err(DecodeError::WrongLength);
+		}
+		let ctx = Secp256k1::without_caps();
+
+		let mut shutdown_scriptpubkey = None;
+		if v.len() >= 272 {
+			let len = byte_utils::slice_to_be16(&v[270..272]) as usize;
+			if v.len() < 272+len {
+				return Err(DecodeError::WrongLength);
+			}
+			shutdown_scriptpubkey = Some(Script::from(v[272..272+len].to_vec()));
+		} else if v.len() != 32+4*8+4+2*2+6*33 { // Message cant have 1 extra byte
+			return Err(DecodeError::WrongLength);
+		}
+
+		Ok(Self {
+			temporary_channel_id: deserialize(&v[0..32]).unwrap(),
+			dust_limit_satoshis: byte_utils::slice_to_be64(&v[32..40]),
+			max_htlc_value_in_flight_msat: byte_utils::slice_to_be64(&v[40..48]),
+			channel_reserve_satoshis: byte_utils::slice_to_be64(&v[48..56]),
+			htlc_minimum_msat: byte_utils::slice_to_be64(&v[56..64]),
+			minimum_depth: byte_utils::slice_to_be32(&v[64..68]),
+			to_self_delay: byte_utils::slice_to_be16(&v[68..70]),
+			max_accepted_htlcs: byte_utils::slice_to_be16(&v[70..72]),
+			funding_pubkey: secp_pubkey!(&ctx, &v[72..105]),
+			revocation_basepoint: secp_pubkey!(&ctx, &v[105..138]),
+			payment_basepoint: secp_pubkey!(&ctx, &v[138..171]),
+			delayed_payment_basepoint: secp_pubkey!(&ctx, &v[171..204]),
+			htlc_basepoint: secp_pubkey!(&ctx, &v[204..237]),
+			first_per_commitment_point: secp_pubkey!(&ctx, &v[237..270]),
+			shutdown_scriptpubkey: shutdown_scriptpubkey
+		})
 	}
 }
 impl MsgEncodable for AcceptChannel {
@@ -564,8 +600,17 @@ impl MsgEncodable for AcceptChannel {
 }
 
 impl MsgDecodable for FundingCreated {
-	fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
-		unimplemented!();
+	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
+		if v.len() < 32+32+2+64 {
+			return Err(DecodeError::WrongLength);
+		}
+		let ctx = Secp256k1::without_caps();
+		Ok(Self {
+			temporary_channel_id: deserialize(&v[0..32]).unwrap(),
+			funding_txid: deserialize(&v[32..64]).unwrap(),
+			funding_output_index: byte_utils::slice_to_be16(&v[64..66]),
+			signature: secp_signature!(&ctx, &v[66..130]),
+		})
 	}
 }
 impl MsgEncodable for FundingCreated {
@@ -575,8 +620,15 @@ impl MsgEncodable for FundingCreated {
 }
 
 impl MsgDecodable for FundingSigned {
-	fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
-		unimplemented!();
+	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
+		if v.len() < 32+64 {
+			return Err(DecodeError::WrongLength);
+		}
+		let ctx = Secp256k1::without_caps();
+		Ok(Self {
+			channel_id: deserialize(&v[0..32]).unwrap(),
+			signature: secp_signature!(&ctx, &v[32..96]),
+		})
 	}
 }
 impl MsgEncodable for FundingSigned {
@@ -586,8 +638,15 @@ impl MsgEncodable for FundingSigned {
 }
 
 impl MsgDecodable for FundingLocked {
-	fn decode(_v: &[u8]) -> Result<Self, DecodeError> {
-		unimplemented!();
+	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
+		if v.len() < 32+33 {
+			return Err(DecodeError::WrongLength);
+		}
+		let ctx = Secp256k1::without_caps();
+		Ok(Self {
+			channel_id: deserialize(&v[0..32]).unwrap(),
+			next_per_commitment_point: secp_pubkey!(&ctx, &v[32..65]),
+		})
 	}
 }
 impl MsgEncodable for FundingLocked {
@@ -839,7 +898,7 @@ impl MsgEncodable for ChannelUpdate {
 
 impl MsgDecodable for OnionRealm0HopData {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
-		if v.len() != 32 {
+		if v.len() < 32 {
 			return Err(DecodeError::WrongLength);
 		}
 		Ok(OnionRealm0HopData {
@@ -862,7 +921,7 @@ impl MsgEncodable for OnionRealm0HopData {
 
 impl MsgDecodable for OnionHopData {
 	fn decode(v: &[u8]) -> Result<Self, DecodeError> {
-		if v.len() != 65 {
+		if v.len() < 65 {
 			return Err(DecodeError::WrongLength);
 		}
 		let realm = v[0];