Pass HRNResolver or DomainResolver into OnionMessenger

Inject specialized resolution capabilities into OnionMessenger to
support outbound payments and third-party resolution services.

This change refines the previous resolution logic by allowing the node
to act as a robust BIP 353 participant. If configured as a service
provider, the node utilizes a Domain Resolver to handle requests for
other participants. Otherwise, it uses an HRN Resolver specifically for
initiating its own outbound payments. Providing these as optional
parameters in the Node constructor ensures the logic matches the
node's designated role in the ecosystem.

Author: chuksys

Cargo.toml

@@ -38,6 +38,7 @@ default = []
 #lightning-transaction-sync = { version = "0.2.0", features = ["esplora-async-https", "time", "electrum-rustls-ring"] }
 #lightning-liquidity = { version = "0.2.0", features = ["std"] }
 #lightning-macros = { version = "0.2.0" }
+#lightning-dns-resolver = { version = "0.3.0" }
 
 lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0", features = ["std"] }
 lightning-types = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0" }
@@ -50,6 +51,7 @@ lightning-block-sync = { git = "https://github.com/lightningdevkit/rust-lightnin
 lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0", features = ["esplora-async-https", "time", "electrum-rustls-ring"] }
 lightning-liquidity = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0", features = ["std"] }
 lightning-macros = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0" }
+lightning-dns-resolver = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "1c730c8a16e28cc8e0c4817717ee63c97abcf4b0" }
 
 bdk_chain = { version = "0.23.0", default-features = false, features = ["std"] }
 bdk_esplora = { version = "0.22.0", default-features = false, features = ["async-https-rustls", "tokio"]}
@@ -140,6 +142,7 @@ harness = false
 #lightning-transaction-sync = { path = "../rust-lightning/lightning-transaction-sync" }
 #lightning-liquidity = { path = "../rust-lightning/lightning-liquidity" }
 #lightning-macros = { path = "../rust-lightning/lightning-macros" }
+#lightning-dns-resolver = { path = "../rust-lightning/lightning-dns-resolver" }
 
 #lightning = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
 #lightning-types = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
@@ -152,6 +155,7 @@ harness = false
 #lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
 #lightning-liquidity = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
 #lightning-macros = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
+#lightning-dns-resolver = { git = "https://github.com/lightningdevkit/rust-lightning", branch = "main" }
 
 #lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
 #lightning-types = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
@@ -164,6 +168,7 @@ harness = false
 #lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
 #lightning-liquidity = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
 #lightning-macros = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
+#lightning-dns-resolver = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "21e9a9c0ef80021d0669f2a366f55d08ba8d9b03" }
 
 #vss-client-ng = { path = "../vss-client" }
 #vss-client-ng = { git = "https://github.com/lightningdevkit/vss-client", branch = "main" }

bindings/ldk_node.udl

@@ -349,6 +349,7 @@ enum NodeError {
 	"InvalidBlindedPaths",
 	"AsyncPaymentServicesDisabled",
 	"HrnParsingFailed",
+	"HrnResolverNotConfigured",
 };
 
 dictionary NodeStatus {
@@ -383,6 +384,7 @@ enum BuildError {
 	"LoggerSetupFailed",
 	"NetworkMismatch",
 	"AsyncPaymentsConfigMismatch",
+	"DNSResolverSetupFailed",
 };
 
 [Trait]

src/builder.rs

@@ -25,6 +25,7 @@ use lightning::ln::channelmanager::{self, ChainParameters, ChannelManagerReadArg
 use lightning::ln::msgs::{RoutingMessageHandler, SocketAddress};
 use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler};
 use lightning::log_trace;
+use lightning::onion_message::dns_resolution::DNSResolverMessageHandler;
 use lightning::routing::gossip::NodeAlias;
 use lightning::routing::router::DefaultRouter;
 use lightning::routing::scoring::{
@@ -38,6 +39,7 @@ use lightning::util::persist::{
 };
 use lightning::util::ser::ReadableArgs;
 use lightning::util::sweep::OutputSweeper;
+use lightning_dns_resolver::OMDomainResolver;
 use lightning_persister::fs_store::FilesystemStore;
 use vss_client::headers::VssHeaderProvider;
 
@@ -72,8 +74,9 @@ use crate::peer_store::PeerStore;
 use crate::runtime::Runtime;
 use crate::tx_broadcaster::TransactionBroadcaster;
 use crate::types::{
-	ChainMonitor, ChannelManager, DynStore, DynStoreWrapper, GossipSync, Graph, KeysManager,
-	MessageRouter, OnionMessenger, PaymentStore, PeerManager, Persister, SyncAndAsyncKVStore,
+	ChainMonitor, ChannelManager, DomainResolver, DynStore, DynStoreWrapper, GossipSync, Graph,
+	HRNResolver, KeysManager, MessageRouter, OnionMessenger, PaymentStore, PeerManager, Persister,
+	SyncAndAsyncKVStore,
 };
 use crate::wallet::persist::KVStoreWalletPersister;
 use crate::wallet::Wallet;
@@ -185,6 +188,8 @@ pub enum BuildError {
 	NetworkMismatch,
 	/// The role of the node in an asynchronous payments context is not compatible with the current configuration.
 	AsyncPaymentsConfigMismatch,
+	/// An attempt to setup a DNS Resolver failed.
+	DNSResolverSetupFailed,
 }
 
 impl fmt::Display for BuildError {
@@ -217,12 +222,21 @@ impl fmt::Display for BuildError {
 					"The async payments role is not compatible with the current configuration."
 				)
 			},
+			Self::DNSResolverSetupFailed => {
+				write!(f, "An attempt to setup a DNS resolver has failed.")
+			},
 		}
 	}
 }
 
 impl std::error::Error for BuildError {}
 
+enum Resolver {
+	HRN(Arc<HRNResolver>),
+	DNS(Arc<DomainResolver>),
+	Ignore(Arc<IgnoringMessageHandler>),
+}
+
 /// A builder for an [`Node`] instance, allowing to set some configuration and module choices from
 /// the getgo.
 ///
@@ -1444,7 +1458,34 @@ fn build_with_store_internal(
 		})?;
 	}
 
-	let hrn_resolver = Arc::new(LDKOnionMessageDNSSECHrnResolver::new(Arc::clone(&network_graph)));
+	let resolver = if let Some(hrn_config) = &config.hrn_config {
+		if hrn_config.is_hrn_resolver {
+			let dns_addr = hrn_config.dns_server_address.as_str();
+
+			Resolver::DNS(Arc::new(OMDomainResolver::ignoring_incoming_proofs(
+				dns_addr.parse().map_err(|_| BuildError::DNSResolverSetupFailed)?,
+			)))
+		} else {
+			Resolver::HRN(Arc::new(LDKOnionMessageDNSSECHrnResolver::new(Arc::clone(
+				&network_graph,
+			))))
+		}
+	} else {
+		// hrn_config is None, default to the IgnoringMessaageHandler.
+		Resolver::Ignore(Arc::new(IgnoringMessageHandler {}))
+	};
+
+	let om_resolver = match resolver {
+		Resolver::DNS(ref dns_resolver) => {
+			Arc::clone(dns_resolver) as Arc<dyn DNSResolverMessageHandler + Send + Sync>
+		},
+		Resolver::HRN(ref hrn_resolver) => {
+			Arc::clone(hrn_resolver) as Arc<dyn DNSResolverMessageHandler + Send + Sync>
+		},
+		Resolver::Ignore(ref ignoring_handler) => {
+			Arc::clone(ignoring_handler) as Arc<dyn DNSResolverMessageHandler + Send + Sync>
+		},
+	};
 
 	// Initialize the PeerManager
 	let onion_messenger: Arc<OnionMessenger> =
@@ -1457,7 +1498,7 @@ fn build_with_store_internal(
 				message_router,
 				Arc::clone(&channel_manager),
 				Arc::clone(&channel_manager),
-				Arc::clone(&hrn_resolver),
+				Arc::clone(&om_resolver),
 				IgnoringMessageHandler {},
 			))
 		} else {
@@ -1469,7 +1510,7 @@ fn build_with_store_internal(
 				message_router,
 				Arc::clone(&channel_manager),
 				Arc::clone(&channel_manager),
-				Arc::clone(&hrn_resolver),
+				Arc::clone(&om_resolver),
 				IgnoringMessageHandler {},
 			))
 		};
@@ -1599,9 +1640,16 @@ fn build_with_store_internal(
 
 	let peer_manager_clone = Arc::clone(&peer_manager);
 
-	hrn_resolver.register_post_queue_action(Box::new(move || {
-		peer_manager_clone.process_events();
-	}));
+	let hrn_resolver = match resolver {
+		Resolver::DNS(_) => None,
+		Resolver::HRN(ref hrn_resolver) => {
+			hrn_resolver.register_post_queue_action(Box::new(move || {
+				peer_manager_clone.process_events();
+			}));
+			Some(hrn_resolver)
+		},
+		Resolver::Ignore(_) => None,
+	};
 
 	liquidity_source.as_ref().map(|l| l.set_peer_manager(Arc::clone(&peer_manager)));
 
@@ -1716,7 +1764,7 @@ fn build_with_store_internal(
 		node_metrics,
 		om_mailbox,
 		async_payments_role,
-		hrn_resolver,
+		hrn_resolver: hrn_resolver.cloned(),
 	})
 }
 

src/error.rs

@@ -131,6 +131,8 @@ pub enum Error {
 	AsyncPaymentServicesDisabled,
 	/// Parsing a Human-Readable Name has failed.
 	HrnParsingFailed,
+	/// A HRN resolver was not configured
+	HrnResolverNotConfigured,
 }
 
 impl fmt::Display for Error {
@@ -213,6 +215,9 @@ impl fmt::Display for Error {
 			Self::HrnParsingFailed => {
 				write!(f, "Failed to parse a human-readable name.")
 			},
+			Self::HrnResolverNotConfigured => {
+				write!(f, "A HRN resolver was not configured.")
+			},
 		}
 	}
 }

src/lib.rs

@@ -207,7 +207,7 @@ pub struct Node {
 	node_metrics: Arc<RwLock<NodeMetrics>>,
 	om_mailbox: Option<Arc<OnionMessageMailbox>>,
 	async_payments_role: Option<AsyncPaymentsRole>,
-	hrn_resolver: Arc<HRNResolver>,
+	hrn_resolver: Option<Arc<HRNResolver>>,
 }
 
 impl Node {
@@ -958,7 +958,7 @@ impl Node {
 			self.bolt12_payment().into(),
 			Arc::clone(&self.config),
 			Arc::clone(&self.logger),
-			Arc::clone(&self.hrn_resolver),
+			Arc::new(self.hrn_resolver.clone()),
 		)
 	}
 
@@ -979,7 +979,7 @@ impl Node {
 			self.bolt12_payment(),
 			Arc::clone(&self.config),
 			Arc::clone(&self.logger),
-			Arc::clone(&self.hrn_resolver),
+			Arc::new(self.hrn_resolver.clone()),
 		))
 	}
 

src/payment/unified.rs

@@ -64,14 +64,14 @@ pub struct UnifiedPayment {
 	bolt12_payment: Arc<Bolt12Payment>,
 	config: Arc<Config>,
 	logger: Arc<Logger>,
-	hrn_resolver: Arc<HRNResolver>,
+	hrn_resolver: Arc<Option<Arc<HRNResolver>>>,
 }
 
 impl UnifiedPayment {
 	pub(crate) fn new(
 		onchain_payment: Arc<OnchainPayment>, bolt11_invoice: Arc<Bolt11Payment>,
 		bolt12_payment: Arc<Bolt12Payment>, config: Arc<Config>, logger: Arc<Logger>,
-		hrn_resolver: Arc<HRNResolver>,
+		hrn_resolver: Arc<Option<Arc<HRNResolver>>>,
 	) -> Self {
 		Self { onchain_payment, bolt11_invoice, bolt12_payment, config, logger, hrn_resolver }
 	}
@@ -161,6 +161,11 @@ impl UnifiedPayment {
 		&self, uri_str: &str, amount_msat: Option<u64>,
 		route_parameters: Option<RouteParametersConfig>,
 	) -> Result<UnifiedPaymentResult, Error> {
+		let resolver = self.hrn_resolver.as_ref().clone().ok_or_else(|| {
+			log_error!(self.logger, "No HRN resolver configured. Cannot resolve HRNs.");
+			Error::HrnResolverNotConfigured
+		})?;
+
 		let parse_fut = PaymentInstructions::parse(
 			uri_str,
 			self.config.network,

src/types.rs

@@ -19,6 +19,7 @@ use lightning::ln::channel_state::ChannelDetails as LdkChannelDetails;
 use lightning::ln::msgs::{RoutingMessageHandler, SocketAddress};
 use lightning::ln::peer_handler::IgnoringMessageHandler;
 use lightning::ln::types::ChannelId;
+use lightning::onion_message::dns_resolution::DNSResolverMessageHandler;
 use lightning::routing::gossip;
 use lightning::routing::router::DefaultRouter;
 use lightning::routing::scoring::{CombinedScorer, ProbabilisticScoringFeeParameters};
@@ -27,6 +28,7 @@ use lightning::util::persist::{KVStore, KVStoreSync, MonitorUpdatingPersister};
 use lightning::util::ser::{Readable, Writeable, Writer};
 use lightning::util::sweep::OutputSweeper;
 use lightning_block_sync::gossip::GossipVerifier;
+use lightning_dns_resolver::OMDomainResolver;
 use lightning_liquidity::utils::time::DefaultTimeProvider;
 use lightning_net_tokio::SocketDescriptor;
 
@@ -277,12 +279,14 @@ pub(crate) type OnionMessenger = lightning::onion_message::messenger::OnionMesse
 	Arc<MessageRouter>,
 	Arc<ChannelManager>,
 	Arc<ChannelManager>,
-	Arc<HRNResolver>,
+	Arc<dyn DNSResolverMessageHandler + Sync + Send>,
 	IgnoringMessageHandler,
 >;
 
 pub(crate) type HRNResolver = LDKOnionMessageDNSSECHrnResolver<Arc<Graph>, Arc<Logger>>;
 
+pub(crate) type DomainResolver = OMDomainResolver<IgnoringMessageHandler>;
+
 pub(crate) type MessageRouter = lightning::onion_message::messenger::DefaultMessageRouter<
 	Arc<Graph>,
 	Arc<Logger>,