X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Fmsgs.rs;h=87944ccae639027da172e120ea83ea8b4d06411a;hb=77948dbcd7b167ff4386f1b9de13bd2d2aa97032;hp=94136a9ee65cb16fb66d292ea0f5e4bcf714b9b8;hpb=8e7b5905fd84999318bdcf9cbcb9cfecbf58f532;p=rust-lightning

diff --git a/lightning/src/ln/msgs.rs b/lightning/src/ln/msgs.rs
index 94136a9e..87944cca 100644
--- a/lightning/src/ln/msgs.rs
+++ b/lightning/src/ln/msgs.rs
@@ -30,13 +30,16 @@ use bitcoin::secp256k1;
 use bitcoin::blockdata::script::Script;
 use bitcoin::hash_types::{Txid, BlockHash};
 
-use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
+use ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
 
+use prelude::*;
 use core::{cmp, fmt};
 use core::fmt::Debug;
-use std::io::Read;
+use io::{self, Read};
+use io_extras::read_to_end;
 
 use util::events::MessageSendEventsProvider;
+use util::logger;
 use util::ser::{Readable, Writeable, Writer, FixedLengthReader, HighZeroBytesDroppedVarInt};
 
 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
@@ -45,7 +48,7 @@ use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
 pub(crate) const MAX_VALUE_MSAT: u64 = 21_000_000_0000_0000_000;
 
 /// An error in decoding a message or struct.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, PartialEq)]
 pub enum DecodeError {
 	/// A version byte specified something we don't know how to handle.
 	/// Includes unknown realm byte in an OnionHopData packet
@@ -62,7 +65,7 @@ pub enum DecodeError {
 	BadLengthDescriptor,
 	/// Error from std::io
 	Io(/// (C-not exported) as ErrorKind doesn't have a reasonable mapping
-        ::std::io::ErrorKind),
+        io::ErrorKind),
 	/// The message included zlib-compressed values, which we don't support.
 	UnsupportedCompression,
 }
@@ -145,6 +148,10 @@ pub struct OpenChannel {
 	pub channel_flags: u8,
 	/// Optionally, a request to pre-set the to-sender output's scriptPubkey for when we collaboratively close
 	pub shutdown_scriptpubkey: OptionalField<Script>,
+	/// The channel type that this channel will represent. If none is set, we derive the channel
+	/// type from the intersection of our feature bits with our counterparty's feature bits from
+	/// the Init message.
+	pub channel_type: Option<ChannelTypeFeatures>,
 }
 
 /// An accept_channel message to be sent or received from a peer
@@ -191,7 +198,7 @@ pub struct FundingCreated {
 	pub funding_txid: Txid,
 	/// The specific output index funding this channel
 	pub funding_output_index: u16,
-	/// The signature of the channel initiator (funder) on the funding transaction
+	/// The signature of the channel initiator (funder) on the initial commitment transaction
 	pub signature: Signature,
 }
 
@@ -200,7 +207,7 @@ pub struct FundingCreated {
 pub struct FundingSigned {
 	/// The channel ID
 	pub channel_id: [u8; 32],
-	/// The signature of the channel acceptor (fundee) on the funding transaction
+	/// The signature of the channel acceptor (fundee) on the initial commitment transaction
 	pub signature: Signature,
 }
 
@@ -223,6 +230,19 @@ pub struct Shutdown {
 	pub scriptpubkey: Script,
 }
 
+/// The minimum and maximum fees which the sender is willing to place on the closing transaction.
+/// This is provided in [`ClosingSigned`] by both sides to indicate the fee range they are willing
+/// to use.
+#[derive(Clone, Debug, PartialEq)]
+pub struct ClosingSignedFeeRange {
+	/// The minimum absolute fee, in satoshis, which the sender is willing to place on the closing
+	/// transaction.
+	pub min_fee_satoshis: u64,
+	/// The maximum absolute fee, in satoshis, which the sender is willing to place on the closing
+	/// transaction.
+	pub max_fee_satoshis: u64,
+}
+
 /// A closing_signed message to be sent or received from a peer
 #[derive(Clone, Debug, PartialEq)]
 pub struct ClosingSigned {
@@ -232,6 +252,9 @@ pub struct ClosingSigned {
 	pub fee_satoshis: u64,
 	/// A signature on the closing transaction
 	pub signature: Signature,
+	/// The minimum and maximum fees which the sender is willing to accept, provided only by new
+	/// nodes.
+	pub fee_range: Option<ClosingSignedFeeRange>,
 }
 
 /// An update_add_htlc message to be sent or received from a peer
@@ -418,7 +441,7 @@ impl NetAddress {
 }
 
 impl Writeable for NetAddress {
-	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
 		match self {
 			&NetAddress::IPv4 { ref addr, ref port } => {
 				1u8.write(writer)?;
@@ -482,6 +505,17 @@ impl Readable for Result<NetAddress, u8> {
 	}
 }
 
+impl Readable for NetAddress {
+	fn read<R: Read>(reader: &mut R) -> Result<NetAddress, DecodeError> {
+		match Readable::read(reader) {
+			Ok(Ok(res)) => Ok(res),
+			Ok(Err(_)) => Err(DecodeError::UnknownVersion),
+			Err(e) => Err(e),
+		}
+	}
+}
+
+
 /// The unsigned part of a node_announcement
 #[derive(Clone, Debug, PartialEq)]
 pub struct UnsignedNodeAnnouncement {
@@ -676,7 +710,11 @@ pub enum ErrorAction {
 		msg: Option<ErrorMessage>
 	},
 	/// The peer did something harmless that we weren't able to process, just log and ignore
+	// New code should *not* use this. New code must use IgnoreAndLog, below!
 	IgnoreError,
+	/// The peer did something harmless that we weren't able to meaningfully process.
+	/// If the error is logged, log it at the given level.
+	IgnoreAndLog(logger::Level),
 	/// The peer did something incorrect. Tell them.
 	SendErrorMessage {
 		/// The message to send.
@@ -711,35 +749,6 @@ pub struct CommitmentUpdate {
 	pub commitment_signed: CommitmentSigned,
 }
 
-/// The information we received from a peer along the route of a payment we originated. This is
-/// returned by ChannelMessageHandler::handle_update_fail_htlc to be passed into
-/// RoutingMessageHandler::handle_htlc_fail_channel_update to update our network map.
-#[derive(Clone, Debug, PartialEq)]
-pub enum HTLCFailChannelUpdate {
-	/// We received an error which included a full ChannelUpdate message.
-	ChannelUpdateMessage {
-		/// The unwrapped message we received
-		msg: ChannelUpdate,
-	},
-	/// We received an error which indicated only that a channel has been closed
-	ChannelClosed {
-		/// The short_channel_id which has now closed.
-		short_channel_id: u64,
-		/// when this true, this channel should be permanently removed from the
-		/// consideration. Otherwise, this channel can be restored as new channel_update is received
-		is_permanent: bool,
-	},
-	/// We received an error which indicated only that a node has failed
-	NodeFailure {
-		/// The node_id that has failed.
-		node_id: PublicKey,
-		/// when this true, node should be permanently removed from the
-		/// consideration. Otherwise, the channels connected to this node can be
-		/// restored as new channel_update is received
-		is_permanent: bool,
-	}
-}
-
 /// Messages could have optional fields to use with extended features
 /// As we wish to serialize these differently from Option<T>s (Options get a tag byte, but
 /// OptionalFeild simply gets Present if there are enough bytes to read into it), we have a
@@ -834,8 +843,6 @@ pub trait RoutingMessageHandler : MessageSendEventsProvider {
 	/// Handle an incoming channel_update message, returning true if it should be forwarded on,
 	/// false or returning an Err otherwise.
 	fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<bool, LightningError>;
-	/// Handle some updates to the route graph that we learned due to an outbound failed payment.
-	fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
 	/// Gets a subset of the channel announcements and updates required to dump our routing table
 	/// to a remote node, starting at the short_channel_id indicated by starting_point and
 	/// including the batch_amount entries immediately higher in numerical value than starting_point.
@@ -867,7 +874,8 @@ pub trait RoutingMessageHandler : MessageSendEventsProvider {
 }
 
 mod fuzzy_internal_msgs {
-	use ln::PaymentSecret;
+	use prelude::*;
+	use ln::{PaymentPreimage, PaymentSecret};
 
 	// These types aren't intended to be pub, but are exposed for direct fuzzing (as we deserialize
 	// them from untrusted input):
@@ -888,6 +896,7 @@ mod fuzzy_internal_msgs {
 		},
 		FinalNode {
 			payment_data: Option<FinalOnionHopData>,
+			keysend_preimage: Option<PaymentPreimage>,
 		},
 	}
 
@@ -960,9 +969,9 @@ impl fmt::Display for DecodeError {
 	}
 }
 
-impl From<::std::io::Error> for DecodeError {
-	fn from(e: ::std::io::Error) -> Self {
-		if e.kind() == ::std::io::ErrorKind::UnexpectedEof {
+impl From<io::Error> for DecodeError {
+	fn from(e: io::Error) -> Self {
+		if e.kind() == io::ErrorKind::UnexpectedEof {
 			DecodeError::ShortRead
 		} else {
 			DecodeError::Io(e.kind())
@@ -971,7 +980,7 @@ impl From<::std::io::Error> for DecodeError {
 }
 
 impl Writeable for OptionalField<Script> {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		match *self {
 			OptionalField::Present(ref script) => {
 				// Note that Writeable for script includes the 16-bit length tag for us
@@ -998,7 +1007,7 @@ impl Readable for OptionalField<Script> {
 }
 
 impl Writeable for OptionalField<u64> {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		match *self {
 			OptionalField::Present(ref value) => {
 				value.write(w)?;
@@ -1017,10 +1026,7 @@ impl Readable for OptionalField<u64> {
 }
 
 
-impl_writeable_len_match!(AcceptChannel, {
-		{AcceptChannel{ shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 270 + 2 + script.len()},
-		{_, 270}
-	}, {
+impl_writeable_msg!(AcceptChannel, {
 	temporary_channel_id,
 	dust_limit_satoshis,
 	max_htlc_value_in_flight_msat,
@@ -1036,18 +1042,17 @@ impl_writeable_len_match!(AcceptChannel, {
 	htlc_basepoint,
 	first_per_commitment_point,
 	shutdown_scriptpubkey
-});
+}, {});
 
-impl_writeable!(AnnouncementSignatures, 32+8+64*2, {
+impl_writeable_msg!(AnnouncementSignatures, {
 	channel_id,
 	short_channel_id,
 	node_signature,
 	bitcoin_signature
-});
+}, {});
 
 impl Writeable for ChannelReestablish {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(if let OptionalField::Present(..) = self.data_loss_protect { 32+2*8+33+32 } else { 32+2*8 });
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.channel_id.write(w)?;
 		self.next_local_commitment_number.write(w)?;
 		self.next_remote_commitment_number.write(w)?;
@@ -1083,47 +1088,47 @@ impl Readable for ChannelReestablish{
 	}
 }
 
-impl_writeable!(ClosingSigned, 32+8+64, {
-	channel_id,
-	fee_satoshis,
-	signature
+impl_writeable_msg!(ClosingSigned,
+	{ channel_id, fee_satoshis, signature },
+	{ (1, fee_range, option) }
+);
+
+impl_writeable!(ClosingSignedFeeRange, {
+	min_fee_satoshis,
+	max_fee_satoshis
 });
 
-impl_writeable_len_match!(CommitmentSigned, {
-		{ CommitmentSigned { ref htlc_signatures, .. }, 32+64+2+htlc_signatures.len()*64 }
-	}, {
+impl_writeable_msg!(CommitmentSigned, {
 	channel_id,
 	signature,
 	htlc_signatures
-});
+}, {});
 
-impl_writeable_len_match!(DecodedOnionErrorPacket, {
-		{ DecodedOnionErrorPacket { ref failuremsg, ref pad, .. }, 32 + 4 + failuremsg.len() + pad.len() }
-	}, {
+impl_writeable!(DecodedOnionErrorPacket, {
 	hmac,
 	failuremsg,
 	pad
 });
 
-impl_writeable!(FundingCreated, 32+32+2+64, {
+impl_writeable_msg!(FundingCreated, {
 	temporary_channel_id,
 	funding_txid,
 	funding_output_index,
 	signature
-});
+}, {});
 
-impl_writeable!(FundingSigned, 32+64, {
+impl_writeable_msg!(FundingSigned, {
 	channel_id,
 	signature
-});
+}, {});
 
-impl_writeable!(FundingLocked, 32+33, {
+impl_writeable_msg!(FundingLocked, {
 	channel_id,
-	next_per_commitment_point
-});
+	next_per_commitment_point,
+}, {});
 
 impl Writeable for Init {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		// global_features gets the bottom 13 bits of our features, and local_features gets all of
 		// our relevant feature bits. This keeps us compatible with old nodes.
 		self.features.write_up_to_13(w)?;
@@ -1141,10 +1146,7 @@ impl Readable for Init {
 	}
 }
 
-impl_writeable_len_match!(OpenChannel, {
-		{ OpenChannel { shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 319 + 2 + script.len() },
-		{ _, 319 }
-	}, {
+impl_writeable_msg!(OpenChannel, {
 	chain_hash,
 	temporary_channel_id,
 	funding_satoshis,
@@ -1164,56 +1166,57 @@ impl_writeable_len_match!(OpenChannel, {
 	first_per_commitment_point,
 	channel_flags,
 	shutdown_scriptpubkey
+}, {
+	(1, channel_type, option),
 });
 
-impl_writeable!(RevokeAndACK, 32+32+33, {
+impl_writeable_msg!(RevokeAndACK, {
 	channel_id,
 	per_commitment_secret,
 	next_per_commitment_point
-});
+}, {});
 
-impl_writeable_len_match!(Shutdown, {
-		{ Shutdown { ref scriptpubkey, .. }, 32 + 2 + scriptpubkey.len() }
-	}, {
+impl_writeable_msg!(Shutdown, {
 	channel_id,
 	scriptpubkey
-});
+}, {});
 
-impl_writeable_len_match!(UpdateFailHTLC, {
-		{ UpdateFailHTLC { ref reason, .. }, 32 + 10 + reason.data.len() }
-	}, {
+impl_writeable_msg!(UpdateFailHTLC, {
 	channel_id,
 	htlc_id,
 	reason
-});
+}, {});
 
-impl_writeable!(UpdateFailMalformedHTLC, 32+8+32+2, {
+impl_writeable_msg!(UpdateFailMalformedHTLC, {
 	channel_id,
 	htlc_id,
 	sha256_of_onion,
 	failure_code
-});
+}, {});
 
-impl_writeable!(UpdateFee, 32+4, {
+impl_writeable_msg!(UpdateFee, {
 	channel_id,
 	feerate_per_kw
-});
+}, {});
 
-impl_writeable!(UpdateFulfillHTLC, 32+8+32, {
+impl_writeable_msg!(UpdateFulfillHTLC, {
 	channel_id,
 	htlc_id,
 	payment_preimage
-});
+}, {});
 
-impl_writeable_len_match!(OnionErrorPacket, {
-		{ OnionErrorPacket { ref data, .. }, 2 + data.len() }
-	}, {
+// Note that this is written as a part of ChannelManager objects, and thus cannot change its
+// serialization format in a way which assumes we know the total serialized length/message end
+// position.
+impl_writeable!(OnionErrorPacket, {
 	data
 });
 
+// Note that this is written as a part of ChannelManager objects, and thus cannot change its
+// serialization format in a way which assumes we know the total serialized length/message end
+// position.
 impl Writeable for OnionPacket {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(1 + 33 + 20*65 + 32);
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.version.write(w)?;
 		match self.public_key {
 			Ok(pubkey) => pubkey.write(w)?,
@@ -1240,18 +1243,17 @@ impl Readable for OnionPacket {
 	}
 }
 
-impl_writeable!(UpdateAddHTLC, 32+8+8+32+4+1366, {
+impl_writeable_msg!(UpdateAddHTLC, {
 	channel_id,
 	htlc_id,
 	amount_msat,
 	payment_hash,
 	cltv_expiry,
 	onion_routing_packet
-});
+}, {});
 
 impl Writeable for FinalOnionHopData {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(32 + 8 - (self.total_msat.leading_zeros()/8) as usize);
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.payment_secret.0.write(w)?;
 		HighZeroBytesDroppedVarInt(self.total_msat).write(w)
 	}
@@ -1266,8 +1268,7 @@ impl Readable for FinalOnionHopData {
 }
 
 impl Writeable for OnionHopData {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(33);
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		// Note that this should never be reachable if Rust-Lightning generated the message, as we
 		// check values are sane long before we get here, though its possible in the future
 		// user-generated messages may hit this.
@@ -1282,20 +1283,20 @@ impl Writeable for OnionHopData {
 			},
 			OnionHopDataFormat::NonFinalNode { short_channel_id } => {
 				encode_varint_length_prefixed_tlv!(w, {
-					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward)),
-					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value)),
-					(6, short_channel_id)
-				}, { });
+					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward), required),
+					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value), required),
+					(6, short_channel_id, required)
+				});
 			},
-			OnionHopDataFormat::FinalNode { ref payment_data } => {
+			OnionHopDataFormat::FinalNode { ref payment_data, ref keysend_preimage } => {
 				if let Some(final_data) = payment_data {
 					if final_data.total_msat > MAX_VALUE_MSAT { panic!("We should never be sending infinite/overflow onion payments"); }
 				}
 				encode_varint_length_prefixed_tlv!(w, {
-					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward)),
-					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value))
-				}, {
-					(8, payment_data)
+					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward), required),
+					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value), required),
+					(8, payment_data, option),
+					(5482373484, keysend_preimage, option)
 				});
 			},
 		}
@@ -1318,12 +1319,14 @@ impl Readable for OnionHopData {
 			let mut cltv_value = HighZeroBytesDroppedVarInt(0u32);
 			let mut short_id: Option<u64> = None;
 			let mut payment_data: Option<FinalOnionHopData> = None;
-			decode_tlv!(&mut rd, {
-				(2, amt),
-				(4, cltv_value)
-			}, {
-				(6, short_id),
-				(8, payment_data)
+			let mut keysend_preimage: Option<PaymentPreimage> = None;
+			// The TLV type is chosen to be compatible with lnd and c-lightning.
+			decode_tlv_stream!(&mut rd, {
+				(2, amt, required),
+				(4, cltv_value, required),
+				(6, short_id, option),
+				(8, payment_data, option),
+				(5482373484, keysend_preimage, option)
 			});
 			rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
 			let format = if let Some(short_channel_id) = short_id {
@@ -1338,7 +1341,8 @@ impl Readable for OnionHopData {
 					}
 				}
 				OnionHopDataFormat::FinalNode {
-					payment_data
+					payment_data,
+					keysend_preimage,
 				}
 			};
 			(format, amt.0, cltv_value.0)
@@ -1364,8 +1368,7 @@ impl Readable for OnionHopData {
 }
 
 impl Writeable for Ping {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(self.byteslen as usize + 4);
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.ponglen.write(w)?;
 		vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
 		Ok(())
@@ -1386,8 +1389,7 @@ impl Readable for Ping {
 }
 
 impl Writeable for Pong {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(self.byteslen as usize + 2);
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
 		Ok(())
 	}
@@ -1406,8 +1408,7 @@ impl Readable for Pong {
 }
 
 impl Writeable for UnsignedChannelAnnouncement {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(2 + 32 + 8 + 4*33 + self.features.byte_count() + self.excess_data.len());
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.features.write(w)?;
 		self.chain_hash.write(w)?;
 		self.short_channel_id.write(w)?;
@@ -1430,19 +1431,12 @@ impl Readable for UnsignedChannelAnnouncement {
 			node_id_2: Readable::read(r)?,
 			bitcoin_key_1: Readable::read(r)?,
 			bitcoin_key_2: Readable::read(r)?,
-			excess_data: {
-				let mut excess_data = vec![];
-				r.read_to_end(&mut excess_data)?;
-				excess_data
-			},
+			excess_data: read_to_end(r)?,
 		})
 	}
 }
 
-impl_writeable_len_match!(ChannelAnnouncement, {
-		{ ChannelAnnouncement { contents: UnsignedChannelAnnouncement {ref features, ref excess_data, ..}, .. },
-			2 + 32 + 8 + 4*33 + features.byte_count() + excess_data.len() + 4*64 }
-	}, {
+impl_writeable!(ChannelAnnouncement, {
 	node_signature_1,
 	node_signature_2,
 	bitcoin_signature_1,
@@ -1451,14 +1445,11 @@ impl_writeable_len_match!(ChannelAnnouncement, {
 });
 
 impl Writeable for UnsignedChannelUpdate {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		let mut size = 64 + self.excess_data.len();
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		let mut message_flags: u8 = 0;
 		if let OptionalField::Present(_) = self.htlc_maximum_msat {
-			size += 8;
 			message_flags = 1;
 		}
-		w.size_hint(size);
 		self.chain_hash.write(w)?;
 		self.short_channel_id.write(w)?;
 		self.timestamp.write(w)?;
@@ -1492,26 +1483,18 @@ impl Readable for UnsignedChannelUpdate {
 			fee_base_msat: Readable::read(r)?,
 			fee_proportional_millionths: Readable::read(r)?,
 			htlc_maximum_msat: if has_htlc_maximum_msat { Readable::read(r)? } else { OptionalField::Absent },
-			excess_data: {
-				let mut excess_data = vec![];
-				r.read_to_end(&mut excess_data)?;
-				excess_data
-			},
+			excess_data: read_to_end(r)?,
 		})
 	}
 }
 
-impl_writeable_len_match!(ChannelUpdate, {
-		{ ChannelUpdate { contents: UnsignedChannelUpdate {ref excess_data, ref htlc_maximum_msat, ..}, .. },
-			64 + 64 + excess_data.len() + if let OptionalField::Present(_) = htlc_maximum_msat { 8 } else { 0 } }
-	}, {
+impl_writeable!(ChannelUpdate, {
 	signature,
 	contents
 });
 
 impl Writeable for ErrorMessage {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(32 + 2 + self.data.len());
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.channel_id.write(w)?;
 		(self.data.len() as u16).write(w)?;
 		w.write_all(self.data.as_bytes())?;
@@ -1525,9 +1508,8 @@ impl Readable for ErrorMessage {
 			channel_id: Readable::read(r)?,
 			data: {
 				let mut sz: usize = <u16 as Readable>::read(r)? as usize;
-				let mut data = vec![];
-				let data_len = r.read_to_end(&mut data)?;
-				sz = cmp::min(data_len, sz);
+				let data = read_to_end(r)?;
+				sz = cmp::min(data.len(), sz);
 				match String::from_utf8(data[..sz as usize].to_vec()) {
 					Ok(s) => s,
 					Err(_) => return Err(DecodeError::InvalidValue),
@@ -1538,8 +1520,7 @@ impl Readable for ErrorMessage {
 }
 
 impl Writeable for UnsignedNodeAnnouncement {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(76 + self.features.byte_count() + self.addresses.len()*38 + self.excess_address_data.len() + self.excess_data.len());
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		self.features.write(w)?;
 		self.timestamp.write(w)?;
 		self.node_id.write(w)?;
@@ -1608,7 +1589,7 @@ impl Readable for UnsignedNodeAnnouncement {
 			}
 			Vec::new()
 		};
-		r.read_to_end(&mut excess_data)?;
+		excess_data.extend(read_to_end(r)?.iter());
 		Ok(UnsignedNodeAnnouncement {
 			features,
 			timestamp,
@@ -1622,10 +1603,7 @@ impl Readable for UnsignedNodeAnnouncement {
 	}
 }
 
-impl_writeable_len_match!(NodeAnnouncement, <=, {
-		{ NodeAnnouncement { contents: UnsignedNodeAnnouncement { ref features, ref addresses, ref excess_address_data, ref excess_data, ..}, .. },
-			64 + 76 + features.byte_count() + addresses.len()*(NetAddress::MAX_LEN as usize + 1) + excess_address_data.len() + excess_data.len() }
-	}, {
+impl_writeable!(NodeAnnouncement, {
 	signature,
 	contents
 });
@@ -1665,11 +1643,10 @@ impl Readable for QueryShortChannelIds {
 }
 
 impl Writeable for QueryShortChannelIds {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		// Calculated from 1-byte encoding_type plus 8-bytes per short_channel_id
 		let encoding_len: u16 = 1 + self.short_channel_ids.len() as u16 * 8;
 
-		w.size_hint(32 + 2 + encoding_len as usize);
 		self.chain_hash.write(w)?;
 		encoding_len.write(w)?;
 
@@ -1684,25 +1661,10 @@ impl Writeable for QueryShortChannelIds {
 	}
 }
 
-impl Readable for ReplyShortChannelIdsEnd {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let full_information: bool = Readable::read(r)?;
-		Ok(ReplyShortChannelIdsEnd {
-			chain_hash,
-			full_information,
-		})
-	}
-}
-
-impl Writeable for ReplyShortChannelIdsEnd {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(32 + 1);
-		self.chain_hash.write(w)?;
-		self.full_information.write(w)?;
-		Ok(())
-	}
-}
+impl_writeable_msg!(ReplyShortChannelIdsEnd, {
+	chain_hash,
+	full_information,
+}, {});
 
 impl QueryChannelRange {
 	/**
@@ -1717,28 +1679,11 @@ impl QueryChannelRange {
 	}
 }
 
-impl Readable for QueryChannelRange {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let first_blocknum: u32 = Readable::read(r)?;
-		let number_of_blocks: u32 = Readable::read(r)?;
-		Ok(QueryChannelRange {
-			chain_hash,
-			first_blocknum,
-			number_of_blocks
-		})
-	}
-}
-
-impl Writeable for QueryChannelRange {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(32 + 4 + 4);
-		self.chain_hash.write(w)?;
-		self.first_blocknum.write(w)?;
-		self.number_of_blocks.write(w)?;
-		Ok(())
-	}
-}
+impl_writeable_msg!(QueryChannelRange, {
+	chain_hash,
+	first_blocknum,
+	number_of_blocks
+}, {});
 
 impl Readable for ReplyChannelRange {
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
@@ -1781,9 +1726,8 @@ impl Readable for ReplyChannelRange {
 }
 
 impl Writeable for ReplyChannelRange {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		let encoding_len: u16 = 1 + self.short_channel_ids.len() as u16 * 8;
-		w.size_hint(32 + 4 + 4 + 1 + 2 + encoding_len as usize);
 		self.chain_hash.write(w)?;
 		self.first_blocknum.write(w)?;
 		self.number_of_blocks.write(w)?;
@@ -1799,36 +1743,19 @@ impl Writeable for ReplyChannelRange {
 	}
 }
 
-impl Readable for GossipTimestampFilter {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let first_timestamp: u32 = Readable::read(r)?;
-		let timestamp_range: u32 = Readable::read(r)?;
-		Ok(GossipTimestampFilter {
-			chain_hash,
-			first_timestamp,
-			timestamp_range,
-		})
-	}
-}
-
-impl Writeable for GossipTimestampFilter {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
-		w.size_hint(32 + 4 + 4);
-		self.chain_hash.write(w)?;
-		self.first_timestamp.write(w)?;
-		self.timestamp_range.write(w)?;
-		Ok(())
-	}
-}
-
+impl_writeable_msg!(GossipTimestampFilter, {
+	chain_hash,
+	first_timestamp,
+	timestamp_range,
+}, {});
 
 #[cfg(test)]
 mod tests {
 	use hex;
 	use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
+	use ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
 	use ln::msgs;
-	use ln::msgs::{ChannelFeatures, FinalOnionHopData, InitFeatures, NodeFeatures, OptionalField, OnionErrorPacket, OnionHopDataFormat};
+	use ln::msgs::{FinalOnionHopData, OptionalField, OnionErrorPacket, OnionHopDataFormat};
 	use util::ser::{Writeable, Readable};
 
 	use bitcoin::hashes::hex::FromHex;
@@ -1841,7 +1768,8 @@ mod tests {
 	use bitcoin::secp256k1::key::{PublicKey,SecretKey};
 	use bitcoin::secp256k1::{Secp256k1, Message};
 
-	use std::io::Cursor;
+	use io::Cursor;
+	use prelude::*;
 
 	#[test]
 	fn encoding_channel_reestablish_no_secret() {
@@ -2131,7 +2059,7 @@ mod tests {
 		do_encoding_channel_update(true, true, true, true);
 	}
 
-	fn do_encoding_open_channel(random_bit: bool, shutdown: bool) {
+	fn do_encoding_open_channel(random_bit: bool, shutdown: bool, incl_chan_type: bool) {
 		let secp_ctx = Secp256k1::new();
 		let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
 		let (_, pubkey_2) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
@@ -2158,7 +2086,8 @@ mod tests {
 			htlc_basepoint: pubkey_5,
 			first_per_commitment_point: pubkey_6,
 			channel_flags: if random_bit { 1 << 5 } else { 0 },
-			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent }
+			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent },
+			channel_type: if incl_chan_type { Some(ChannelTypeFeatures::empty()) } else { None },
 		};
 		let encoded_value = open_channel.encode();
 		let mut target_value = Vec::new();
@@ -2172,15 +2101,22 @@ mod tests {
 		if shutdown {
 			target_value.append(&mut hex::decode("001976a91479b000887626b294a914501a4cd226b58b23598388ac").unwrap());
 		}
+		if incl_chan_type {
+			target_value.append(&mut hex::decode("0100").unwrap());
+		}
 		assert_eq!(encoded_value, target_value);
 	}
 
 	#[test]
 	fn encoding_open_channel() {
-		do_encoding_open_channel(false, false);
-		do_encoding_open_channel(true, false);
-		do_encoding_open_channel(false, true);
-		do_encoding_open_channel(true, true);
+		do_encoding_open_channel(false, false, false);
+		do_encoding_open_channel(false, false, true);
+		do_encoding_open_channel(false, true, false);
+		do_encoding_open_channel(false, true, true);
+		do_encoding_open_channel(true, false, false);
+		do_encoding_open_channel(true, false, true);
+		do_encoding_open_channel(true, true, false);
+		do_encoding_open_channel(true, true, true);
 	}
 
 	fn do_encoding_accept_channel(shutdown: bool) {
@@ -2308,10 +2244,27 @@ mod tests {
 			channel_id: [2; 32],
 			fee_satoshis: 2316138423780173,
 			signature: sig_1,
+			fee_range: None,
 		};
 		let encoded_value = closing_signed.encode();
 		let target_value = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034dd977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
 		assert_eq!(encoded_value, target_value);
+		assert_eq!(msgs::ClosingSigned::read(&mut Cursor::new(&target_value)).unwrap(), closing_signed);
+
+		let closing_signed_with_range = msgs::ClosingSigned {
+			channel_id: [2; 32],
+			fee_satoshis: 2316138423780173,
+			signature: sig_1,
+			fee_range: Some(msgs::ClosingSignedFeeRange {
+				min_fee_satoshis: 0xdeadbeef,
+				max_fee_satoshis: 0x1badcafe01234567,
+			}),
+		};
+		let encoded_value_with_range = closing_signed_with_range.encode();
+		let target_value_with_range = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034dd977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a011000000000deadbeef1badcafe01234567").unwrap();
+		assert_eq!(encoded_value_with_range, target_value_with_range);
+		assert_eq!(msgs::ClosingSigned::read(&mut Cursor::new(&target_value_with_range)).unwrap(),
+			closing_signed_with_range);
 	}
 
 	#[test]
@@ -2517,6 +2470,7 @@ mod tests {
 		let mut msg = msgs::OnionHopData {
 			format: OnionHopDataFormat::FinalNode {
 				payment_data: None,
+				keysend_preimage: None,
 			},
 			amt_to_forward: 0x0badf00d01020304,
 			outgoing_cltv_value: 0xffffffff,
@@ -2525,7 +2479,7 @@ mod tests {
 		let target_value = hex::decode("1002080badf00d010203040404ffffffff").unwrap();
 		assert_eq!(encoded_value, target_value);
 		msg = Readable::read(&mut Cursor::new(&target_value[..])).unwrap();
-		if let OnionHopDataFormat::FinalNode { payment_data: None } = msg.format { } else { panic!(); }
+		if let OnionHopDataFormat::FinalNode { payment_data: None, .. } = msg.format { } else { panic!(); }
 		assert_eq!(msg.amt_to_forward, 0x0badf00d01020304);
 		assert_eq!(msg.outgoing_cltv_value, 0xffffffff);
 	}
@@ -2539,6 +2493,7 @@ mod tests {
 					payment_secret: expected_payment_secret,
 					total_msat: 0x1badca1f
 				}),
+				keysend_preimage: None,
 			},
 			amt_to_forward: 0x0badf00d01020304,
 			outgoing_cltv_value: 0xffffffff,
@@ -2551,7 +2506,8 @@ mod tests {
 			payment_data: Some(FinalOnionHopData {
 				payment_secret,
 				total_msat: 0x1badca1f
-			})
+			}),
+			keysend_preimage: None,
 		} = msg.format {
 			assert_eq!(payment_secret, expected_payment_secret);
 		} else { panic!(); }