use bitcoin::secp256k1::PublicKey;
use bitcoin::secp256k1::ecdh::SharedSecret;
+use crate::blinded_path::BlindedPath;
+use crate::blinded_path::message::{ForwardTlvs, NextHop, ReceiveTlvs};
+use crate::blinded_path::utils::Padding;
use crate::ln::msgs::DecodeError;
use crate::ln::onion_utils;
-use super::blinded_path::{BlindedPath, ForwardTlvs, ReceiveTlvs};
use super::messenger::CustomOnionMessageHandler;
-use crate::util::chacha20poly1305rfc::{ChaChaPolyReadAdapter, ChaChaPolyWriteAdapter};
+use super::offers::OffersMessage;
+use crate::crypto::streams::{ChaChaPolyReadAdapter, ChaChaPolyWriteAdapter};
+use crate::util::logger::Logger;
use crate::util::ser::{BigSize, FixedLengthReader, LengthRead, LengthReadable, LengthReadableArgs, Readable, ReadableArgs, Writeable, Writer};
use core::cmp;
pub(super) const SMALL_PACKET_HOP_DATA_LEN: usize = 1300;
pub(super) const BIG_PACKET_HOP_DATA_LEN: usize = 32768;
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub(crate) struct Packet {
- pub(super) version: u8,
- pub(super) public_key: PublicKey,
+/// Packet of hop data for next peer
+#[derive(Clone, Debug, Hash, PartialEq, Eq)]
+pub struct Packet {
+ /// Bolt 04 version number
+ pub version: u8,
+ /// A random sepc256k1 point, used to build the ECDH shared secret to decrypt hop_data
+ pub public_key: PublicKey,
+ /// Encrypted payload for the next hop
+ //
// Unlike the onion packets used for payments, onion message packets can have payloads greater
// than 1300 bytes.
// TODO: if 1300 ends up being the most common size, optimize this to be:
// enum { ThirteenHundred([u8; 1300]), VarLen(Vec<u8>) }
- pub(super) hop_data: Vec<u8>,
- pub(super) hmac: [u8; 32],
+ pub hop_data: Vec<u8>,
+ /// HMAC to verify the integrity of hop_data
+ pub hmac: [u8; 32],
}
impl onion_utils::Packet for Packet {
/// Onion message payloads contain "control" TLVs and "data" TLVs. Control TLVs are used to route
/// the onion message from hop to hop and for path verification, whereas data TLVs contain the onion
/// message content itself, such as an invoice request.
-pub(super) enum Payload<T: CustomOnionMessageContents> {
+pub(super) enum Payload<T: OnionMessageContents> {
/// This payload is for an intermediate hop.
Forward(ForwardControlTlvs),
/// This payload is for the final hop.
Receive {
control_tlvs: ReceiveControlTlvs,
reply_path: Option<BlindedPath>,
- message: OnionMessageContents<T>,
+ message: T,
}
}
+/// The contents of an [`OnionMessage`] as read from the wire.
+///
+/// [`OnionMessage`]: crate::ln::msgs::OnionMessage
#[derive(Debug)]
-/// The contents of an onion message. In the context of offers, this would be the invoice, invoice
-/// request, or invoice error.
-pub enum OnionMessageContents<T: CustomOnionMessageContents> {
- // Coming soon:
- // Invoice,
- // InvoiceRequest,
- // InvoiceError,
+pub enum ParsedOnionMessageContents<T: OnionMessageContents> {
+ /// A message related to BOLT 12 Offers.
+ Offers(OffersMessage),
/// A custom onion message specified by the user.
Custom(T),
}
-impl<T: CustomOnionMessageContents> OnionMessageContents<T> {
+impl<T: OnionMessageContents> OnionMessageContents for ParsedOnionMessageContents<T> {
/// Returns the type that was used to decode the message payload.
- pub fn tlv_type(&self) -> u64 {
+ ///
+ /// This is not exported to bindings users as methods on non-cloneable enums are not currently exportable
+ fn tlv_type(&self) -> u64 {
match self {
- &OnionMessageContents::Custom(ref msg) => msg.tlv_type(),
+ &ParsedOnionMessageContents::Offers(ref msg) => msg.tlv_type(),
+ &ParsedOnionMessageContents::Custom(ref msg) => msg.tlv_type(),
}
}
}
-impl<T: CustomOnionMessageContents> Writeable for OnionMessageContents<T> {
+impl<T: OnionMessageContents> Writeable for ParsedOnionMessageContents<T> {
fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
match self {
- OnionMessageContents::Custom(msg) => Ok(msg.write(w)?),
+ ParsedOnionMessageContents::Offers(msg) => Ok(msg.write(w)?),
+ ParsedOnionMessageContents::Custom(msg) => Ok(msg.write(w)?),
}
}
}
-/// The contents of a custom onion message.
-pub trait CustomOnionMessageContents: Writeable {
+/// The contents of an onion message.
+pub trait OnionMessageContents: Writeable + core::fmt::Debug {
/// Returns the TLV type identifying the message contents. MUST be >= 64.
fn tlv_type(&self) -> u64;
}
Blinded(Vec<u8>),
/// If we're constructing an onion message hop through an intermediate unblinded node, we'll need
/// to construct the intermediate hop's control TLVs in their unblinded state to avoid encoding
- /// them into an intermediate Vec. See [`super::blinded_path::ForwardTlvs`] for more info.
+ /// them into an intermediate Vec. See [`crate::blinded_path::message::ForwardTlvs`] for more
+ /// info.
Unblinded(ForwardTlvs),
}
pub(super) enum ReceiveControlTlvs {
/// See [`ForwardControlTlvs::Blinded`].
Blinded(Vec<u8>),
- /// See [`ForwardControlTlvs::Unblinded`] and [`super::blinded_path::ReceiveTlvs`].
+ /// See [`ForwardControlTlvs::Unblinded`] and [`crate::blinded_path::message::ReceiveTlvs`].
Unblinded(ReceiveTlvs),
}
// Uses the provided secret to simultaneously encode and encrypt the unblinded control TLVs.
-impl<T: CustomOnionMessageContents> Writeable for (Payload<T>, [u8; 32]) {
+impl<T: OnionMessageContents> Writeable for (Payload<T>, [u8; 32]) {
fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
match &self.0 {
Payload::Forward(ForwardControlTlvs::Blinded(encrypted_bytes)) => {
- encode_varint_length_prefixed_tlv!(w, {
- (4, *encrypted_bytes, vec_type)
+ _encode_varint_length_prefixed_tlv!(w, {
+ (4, *encrypted_bytes, required_vec)
})
},
Payload::Receive {
control_tlvs: ReceiveControlTlvs::Blinded(encrypted_bytes), reply_path, message,
} => {
- encode_varint_length_prefixed_tlv!(w, {
+ _encode_varint_length_prefixed_tlv!(w, {
(2, reply_path, option),
- (4, *encrypted_bytes, vec_type),
+ (4, *encrypted_bytes, required_vec),
(message.tlv_type(), message, required)
})
},
Payload::Forward(ForwardControlTlvs::Unblinded(control_tlvs)) => {
let write_adapter = ChaChaPolyWriteAdapter::new(self.1, &control_tlvs);
- encode_varint_length_prefixed_tlv!(w, {
+ _encode_varint_length_prefixed_tlv!(w, {
(4, write_adapter, required)
})
},
control_tlvs: ReceiveControlTlvs::Unblinded(control_tlvs), reply_path, message,
} => {
let write_adapter = ChaChaPolyWriteAdapter::new(self.1, &control_tlvs);
- encode_varint_length_prefixed_tlv!(w, {
+ _encode_varint_length_prefixed_tlv!(w, {
(2, reply_path, option),
(4, write_adapter, required),
(message.tlv_type(), message, required)
}
// Uses the provided secret to simultaneously decode and decrypt the control TLVs and data TLV.
-impl<H: CustomOnionMessageHandler> ReadableArgs<(SharedSecret, &H)> for Payload<<H as CustomOnionMessageHandler>::CustomMessage> {
- fn read<R: Read>(r: &mut R, args: (SharedSecret, &H)) -> Result<Self, DecodeError> {
- let (encrypted_tlvs_ss, handler) = args;
+impl<H: CustomOnionMessageHandler + ?Sized, L: Logger + ?Sized> ReadableArgs<(SharedSecret, &H, &L)>
+for Payload<ParsedOnionMessageContents<<H as CustomOnionMessageHandler>::CustomMessage>> {
+ fn read<R: Read>(r: &mut R, args: (SharedSecret, &H, &L)) -> Result<Self, DecodeError> {
+ let (encrypted_tlvs_ss, handler, logger) = args;
let v: BigSize = Readable::read(r)?;
let mut rd = FixedLengthReader::new(r, v.0);
let rho = onion_utils::gen_rho_from_shared_secret(&encrypted_tlvs_ss.secret_bytes());
let mut message_type: Option<u64> = None;
let mut message = None;
- decode_tlv_stream!(&mut rd, {
+ decode_tlv_stream_with_custom_tlv_decode!(&mut rd, {
(2, reply_path, option),
(4, read_adapter, (option: LengthReadableArgs, rho)),
}, |msg_type, msg_reader| {
if message_type.is_some() { return Err(DecodeError::InvalidValue) }
message_type = Some(msg_type);
- match handler.read_custom_message(msg_type, msg_reader) {
- Ok(Some(msg)) => {
- message = Some(msg);
+ match msg_type {
+ tlv_type if OffersMessage::is_known_type(tlv_type) => {
+ let msg = OffersMessage::read(msg_reader, (tlv_type, logger))?;
+ message = Some(ParsedOnionMessageContents::Offers(msg));
Ok(true)
},
- Ok(None) => Ok(false),
- Err(e) => Err(e),
+ _ => match handler.read_custom_message(msg_type, msg_reader)? {
+ Some(msg) => {
+ message = Some(ParsedOnionMessageContents::Custom(msg));
+ Ok(true)
+ },
+ None => Ok(false),
+ },
}
});
rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
Ok(Payload::Forward(ForwardControlTlvs::Unblinded(tlvs)))
},
Some(ChaChaPolyReadAdapter { readable: ControlTlvs::Receive(tlvs)}) => {
- if message.is_none() { return Err(DecodeError::InvalidValue) }
Ok(Payload::Receive {
control_tlvs: ReceiveControlTlvs::Unblinded(tlvs),
reply_path,
- message: OnionMessageContents::Custom(message.unwrap()),
+ message: message.ok_or(DecodeError::InvalidValue)?,
})
- }
+ },
}
}
}
/// When reading a packet off the wire, we don't know a priori whether the packet is to be forwarded
-/// or received. Thus we read a ControlTlvs rather than reading a ForwardControlTlvs or
-/// ReceiveControlTlvs directly.
-pub(super) enum ControlTlvs {
+/// or received. Thus we read a `ControlTlvs` rather than reading a [`ForwardTlvs`] or
+/// [`ReceiveTlvs`] directly. Also useful on the encoding side to keep forward and receive TLVs in
+/// the same iterator.
+pub(crate) enum ControlTlvs {
/// This onion message is intended to be forwarded.
Forward(ForwardTlvs),
/// This onion message is intended to be received.
}
impl Readable for ControlTlvs {
- fn read<R: Read>(mut r: &mut R) -> Result<Self, DecodeError> {
- let mut _padding: Option<Padding> = None;
- let mut _short_channel_id: Option<u64> = None;
- let mut next_node_id: Option<PublicKey> = None;
- let mut path_id: Option<[u8; 32]> = None;
- let mut next_blinding_override: Option<PublicKey> = None;
- decode_tlv_stream!(&mut r, {
+ fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+ _init_and_read_tlv_stream!(r, {
(1, _padding, option),
- (2, _short_channel_id, option),
+ (2, short_channel_id, option),
(4, next_node_id, option),
(6, path_id, option),
(8, next_blinding_override, option),
});
+ let _padding: Option<Padding> = _padding;
- let valid_fwd_fmt = next_node_id.is_some() && path_id.is_none();
- let valid_recv_fmt = next_node_id.is_none() && next_blinding_override.is_none();
+ let next_hop = match (short_channel_id, next_node_id) {
+ (Some(_), Some(_)) => return Err(DecodeError::InvalidValue),
+ (Some(scid), None) => Some(NextHop::ShortChannelId(scid)),
+ (None, Some(pubkey)) => Some(NextHop::NodeId(pubkey)),
+ (None, None) => None,
+ };
+
+ let valid_fwd_fmt = next_hop.is_some() && path_id.is_none();
+ let valid_recv_fmt = next_hop.is_none() && next_blinding_override.is_none();
let payload_fmt = if valid_fwd_fmt {
ControlTlvs::Forward(ForwardTlvs {
- next_node_id: next_node_id.unwrap(),
+ next_hop: next_hop.unwrap(),
next_blinding_override,
})
} else if valid_recv_fmt {
}
}
-/// Reads padding to the end, ignoring what's read.
-pub(crate) struct Padding {}
-impl Readable for Padding {
- #[inline]
- fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
- loop {
- let mut buf = [0; 8192];
- if reader.read(&mut buf[..])? == 0 { break; }
+impl Writeable for ControlTlvs {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+ match self {
+ Self::Forward(tlvs) => tlvs.write(w),
+ Self::Receive(tlvs) => tlvs.write(w),
}
- Ok(Self {})
}
}
projects / rust-lightning / blobdiff