// 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;
/// # 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);
///
/// 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`].
}
}
}
+
+ 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`].
projects / rust-lightning / blobdiff