Add an onion message-based DNSSEC HRN Resolver

Doing HRN resolution natively over the normal internet tends to be
horrendous for privacy. One of the main motivations for BIP 353 was
to limit the impacts of this by allowing for easier proxying of DNS
requests.

Here we add one such proxied request, specifically using lightning
onion messages to do the DNS requests.

Author: TheBlueMatt

Cargo.toml

@@ -15,18 +15,20 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [features]
 http = ["reqwest", "std", "serde", "serde_json"]
-std = ["dnssec-prover"]
+std = ["dnssec-prover", "getrandom"]
 default = ["std"]
 
 [dependencies]
 lightning-invoice = { version = "0.33", default-features = false }
 lightning = { version = "0.1", default-features = false, features = ["dnssec"] }
 bitcoin = { version = "0.32", default-features = false }
-getrandom = { version = "0.3", default-features = false }
+getrandom = { version = "0.3", default-features = false, optional = true }
 dnssec-prover = { version = "0.6", default-features = false, optional = true, features = ["validation", "std", "tokio"] }
 reqwest = { version = "0.11", default-features = false, optional = true, features = ["rustls-tls-webpki-roots", "json"] }
 serde = { version = "1.0", default-features = false, optional = true, features = ["derive"] }
 serde_json = { version = "1.0", default-features = false, optional = true, features = ["alloc"] }
 
 [dev-dependencies]
 tokio = { version = "1.0", default-features = false, features = ["rt", "macros"] }
+lightning = { version = "0.1", features = ["std"] }
+lightning-net-tokio = { version = "0.1", default-features = false }

ci/ci-tests.sh

@@ -13,7 +13,10 @@ cargo check --verbose --color always
 cargo check --release --verbose --color always
 cargo test --no-default-features
 [ "$RUSTC_MINOR_VERSION" -gt 81 ] && cargo test --features http
-cargo test --features std
+# One std test syncs much of the lightning network graph, so --release is a must
+# At least until https://github.com/lightningdevkit/rust-lightning/pull/3687 gets backported
+export RUSTFLAGS="-C debug-assertions=on"
+cargo test --features std --release
 [ "$RUSTC_MINOR_VERSION" -gt 81 ] && cargo doc --document-private-items --no-default-features
 [ "$RUSTC_MINOR_VERSION" -gt 81 ] && cargo doc --document-private-items --features http,std
 exit 0

src/lib.rs

@@ -57,6 +57,9 @@ pub mod dns_resolver;
 #[cfg(feature = "http")]
 pub mod http_resolver;
 
+#[cfg(feature = "std")] // TODO: Drop once we upgrade to LDK 0.2
+pub mod onion_message_resolver;
+
 pub mod amount;
 
 pub mod receive;