// You may not use this file except in accordance with one or both of these
// licenses.
-//! LDK sends, receives, and forwards onion messages via the [`OnionMessenger`]. See its docs for
-//! more information.
+//! LDK sends, receives, and forwards onion messages via this [`OnionMessenger`], which lives here,
+//! as well as various types, traits, and utilities that it uses.
use bitcoin::hashes::{Hash, HashEngine};
use bitcoin::hashes::hmac::{Hmac, HmacEngine};
use crate::blinded_path::message::{advance_path_by_one, ForwardTlvs, ReceiveTlvs};
use crate::blinded_path::utils;
use crate::events::{Event, EventHandler, EventsProvider};
-use crate::sign::{EntropySource, KeysManager, NodeSigner, Recipient};
+use crate::sign::{EntropySource, NodeSigner, Recipient};
#[cfg(not(c_bindings))]
use crate::ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
use crate::ln::features::{InitFeatures, NodeFeatures};
use crate::ln::msgs::{self, OnionMessage, OnionMessageHandler, SocketAddress};
use crate::ln::onion_utils;
-use crate::ln::peer_handler::IgnoringMessageHandler;
use crate::routing::gossip::{NetworkGraph, NodeId};
-pub use super::packet::OnionMessageContents;
+use super::packet::OnionMessageContents;
use super::packet::ParsedOnionMessageContents;
use super::offers::OffersMessageHandler;
use super::packet::{BIG_PACKET_HOP_DATA_LEN, ForwardControlTlvs, Packet, Payload, ReceiveControlTlvs, SMALL_PACKET_HOP_DATA_LEN};
use core::fmt;
use core::ops::Deref;
use crate::io;
-use crate::sync::{Arc, Mutex};
+use crate::sync::Mutex;
use crate::prelude::*;
+#[cfg(not(c_bindings))]
+use {
+ crate::sign::KeysManager,
+ crate::ln::peer_handler::IgnoringMessageHandler,
+ crate::sync::Arc,
+};
+
pub(super) const MAX_TIMER_TICKS: usize = 2;
/// A sender, receiver and forwarder of [`OnionMessage`]s.
/// # extern crate bitcoin;
/// # use bitcoin::hashes::_export::_core::time::Duration;
/// # use bitcoin::hashes::hex::FromHex;
-/// # use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
+/// # use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey, self};
/// # use lightning::blinded_path::BlindedPath;
-/// # use lightning::sign::KeysManager;
+/// # use lightning::sign::{EntropySource, KeysManager};
/// # use lightning::ln::peer_handler::IgnoringMessageHandler;
-/// # use lightning::onion_message::{OnionMessageContents, Destination, MessageRouter, OnionMessagePath, OnionMessenger};
+/// # use lightning::onion_message::messenger::{Destination, MessageRouter, OnionMessagePath, OnionMessenger};
+/// # use lightning::onion_message::packet::OnionMessageContents;
/// # use lightning::util::logger::{Logger, Record};
/// # use lightning::util::ser::{Writeable, Writer};
/// # use lightning::io;
/// # Ok(OnionMessagePath {
/// # intermediate_nodes: vec![hop_node_id1, hop_node_id2],
/// # destination,
-/// # addresses: None,
+/// # first_node_addresses: None,
/// # })
/// # }
+/// # fn create_blinded_paths<ES: EntropySource + ?Sized, T: secp256k1::Signing + secp256k1::Verification>(
+/// # &self, _recipient: PublicKey, _peers: Vec<PublicKey>, _entropy_source: &ES, _secp_ctx: &Secp256k1<T>
+/// # ) -> Result<Vec<BlindedPath>, ()> {
+/// # unreachable!()
+/// # }
/// # }
/// # let seed = [42u8; 32];
/// # let time = Duration::from_secs(123456);
*self = OnionMessageRecipient::ConnectedPeer(new_pending_messages);
}
}
+
+ fn is_connected(&self) -> bool {
+ match self {
+ OnionMessageRecipient::ConnectedPeer(..) => true,
+ OnionMessageRecipient::PendingConnection(..) => false,
+ }
+ }
}
/// An [`OnionMessage`] for [`OnionMessenger`] to send.
///
/// These are obtained when released from [`OnionMessenger`]'s handlers after which they are
/// enqueued for sending.
-pub type PendingOnionMessage<T: OnionMessageContents> = (T, Destination, Option<BlindedPath>);
+pub type PendingOnionMessage<T> = (T, Destination, Option<BlindedPath>);
pub(crate) fn new_pending_onion_message<T: OnionMessageContents>(
contents: T, destination: Destination, reply_path: Option<BlindedPath>
fn find_path(
&self, sender: PublicKey, peers: Vec<PublicKey>, destination: Destination
) -> Result<OnionMessagePath, ()>;
+
+ /// Creates [`BlindedPath`]s to the `recipient` node. The nodes in `peers` are assumed to be
+ /// direct peers with the `recipient`.
+ fn create_blinded_paths<
+ ES: EntropySource + ?Sized, T: secp256k1::Signing + secp256k1::Verification
+ >(
+ &self, recipient: PublicKey, peers: Vec<PublicKey>, entropy_source: &ES,
+ secp_ctx: &Secp256k1<T>
+ ) -> Result<Vec<BlindedPath>, ()>;
}
/// A [`MessageRouter`] that can only route to a directly connected [`Destination`].
) -> Result<OnionMessagePath, ()> {
let first_node = destination.first_node();
if peers.contains(&first_node) {
- Ok(OnionMessagePath { intermediate_nodes: vec![], destination, addresses: None })
+ Ok(OnionMessagePath {
+ intermediate_nodes: vec![], destination, first_node_addresses: None
+ })
} else {
let network_graph = self.network_graph.deref().read_only();
let node_announcement = network_graph
match node_announcement {
Some(node_announcement) if node_announcement.features.supports_onion_messages() => {
- let addresses = Some(node_announcement.addresses.clone());
- Ok(OnionMessagePath { intermediate_nodes: vec![], destination, addresses })
+ let first_node_addresses = Some(node_announcement.addresses.clone());
+ Ok(OnionMessagePath {
+ intermediate_nodes: vec![], destination, first_node_addresses
+ })
},
_ => Err(()),
}
}
}
+
+ fn create_blinded_paths<
+ ES: EntropySource + ?Sized, T: secp256k1::Signing + secp256k1::Verification
+ >(
+ &self, recipient: PublicKey, peers: Vec<PublicKey>, entropy_source: &ES,
+ secp_ctx: &Secp256k1<T>
+ ) -> Result<Vec<BlindedPath>, ()> {
+ // Limit the number of blinded paths that are computed.
+ const MAX_PATHS: usize = 3;
+
+ // Ensure peers have at least three channels so that it is more difficult to infer the
+ // recipient's node_id.
+ const MIN_PEER_CHANNELS: usize = 3;
+
+ let network_graph = self.network_graph.deref().read_only();
+ let paths = peers.iter()
+ // Limit to peers with announced channels
+ .filter(|pubkey|
+ network_graph
+ .node(&NodeId::from_pubkey(pubkey))
+ .map(|info| &info.channels[..])
+ .map(|channels| channels.len() >= MIN_PEER_CHANNELS)
+ .unwrap_or(false)
+ )
+ .map(|pubkey| vec![*pubkey, recipient])
+ .map(|node_pks| BlindedPath::new_for_message(&node_pks, entropy_source, secp_ctx))
+ .take(MAX_PATHS)
+ .collect::<Result<Vec<_>, _>>();
+
+ match paths {
+ Ok(paths) if !paths.is_empty() => Ok(paths),
+ _ => {
+ if network_graph.nodes().contains_key(&NodeId::from_pubkey(&recipient)) {
+ BlindedPath::one_hop_for_message(recipient, entropy_source, secp_ctx)
+ .map(|path| vec![path])
+ } else {
+ Err(())
+ }
+ },
+ }
+ }
}
/// A path for sending an [`OnionMessage`].
///
/// Only needs to be set if a connection to the node is required. [`OnionMessenger`] may use
/// this to initiate such a connection.
- pub addresses: Option<Vec<SocketAddress>>,
+ pub first_node_addresses: Option<Vec<SocketAddress>>,
}
impl OnionMessagePath {
/// Creates an [`OnionMessage`] with the given `contents` for sending to the destination of
/// `path`.
///
-/// Returns both the node id of the peer to send the message to and the message itself.
+/// Returns the node id of the peer to send the message to, the message itself, and any addresses
+/// need to connect to the first node.
pub fn create_onion_message<ES: Deref, NS: Deref, T: OnionMessageContents>(
entropy_source: &ES, node_signer: &NS, secp_ctx: &Secp256k1<secp256k1::All>,
path: OnionMessagePath, contents: T, reply_path: Option<BlindedPath>,
ES::Target: EntropySource,
NS::Target: NodeSigner,
{
- let OnionMessagePath { intermediate_nodes, mut destination, addresses } = path;
+ let OnionMessagePath { intermediate_nodes, mut destination, first_node_addresses } = path;
if let Destination::BlindedPath(BlindedPath { ref blinded_hops, .. }) = destination {
if blinded_hops.is_empty() {
return Err(SendError::TooFewBlindedHops);
packet_payloads, packet_keys, prng_seed).map_err(|()| SendError::TooBigPacket)?;
let message = OnionMessage { blinding_point, onion_routing_packet };
- Ok((first_node_id, message, addresses))
+ Ok((first_node_id, message, first_node_addresses))
}
/// Decode one layer of an incoming [`OnionMessage`].
},
hash_map::Entry::Occupied(mut e) => {
e.get_mut().enqueue_message(onion_message);
- Ok(SendSuccess::Buffered)
+ if e.get().is_connected() {
+ Ok(SendSuccess::Buffered)
+ } else {
+ Ok(SendSuccess::BufferedAwaitingConnection(first_node_id))
+ }
},
}
}
fn peer_disconnected(&self, their_node_id: &PublicKey) {
match self.message_recipients.lock().unwrap().remove(their_node_id) {
Some(OnionMessageRecipient::ConnectedPeer(..)) => {},
- _ => debug_assert!(false),
+ Some(_) => debug_assert!(false),
+ None => {},
}
}
projects / rust-lightning / blobdiff