Merge pull request #2636 from slanesuke/impl-ToSocketAddrs-for-Hostname

Impl ToSocketAddrs for SocketAddress

lightning/src/ln/msgs.rs

@@ -46,6 +46,8 @@ use core::fmt::Debug;
 use core::ops::Deref;
 #[cfg(feature = "std")]
 use core::str::FromStr;
+#[cfg(feature = "std")]
+use std::net::SocketAddr;
 use crate::io::{self, Cursor, Read};
 use crate::io_extras::read_to_end;
 
@@ -958,6 +960,37 @@ impl From<std::net::SocketAddr> for SocketAddress {
 		}
 }
 
+#[cfg(feature = "std")]
+impl std::net::ToSocketAddrs for SocketAddress {
+	type Iter = std::vec::IntoIter<std::net::SocketAddr>;
+
+	fn to_socket_addrs(&self) -> std::io::Result<Self::Iter> {
+		match self {
+			SocketAddress::TcpIpV4 { addr, port } => {
+				let ip_addr = std::net::Ipv4Addr::from(*addr);
+				let socket_addr = SocketAddr::new(ip_addr.into(), *port);
+				Ok(vec![socket_addr].into_iter())
+			}
+			SocketAddress::TcpIpV6 { addr, port } => {
+				let ip_addr = std::net::Ipv6Addr::from(*addr);
+				let socket_addr = SocketAddr::new(ip_addr.into(), *port);
+				Ok(vec![socket_addr].into_iter())
+			}
+			SocketAddress::Hostname { ref hostname, port } => {
+				(hostname.as_str(), *port).to_socket_addrs()
+			}
+			SocketAddress::OnionV2(..) => {
+				Err(std::io::Error::new(std::io::ErrorKind::Other, "Resolution of OnionV2 \
+				addresses is currently unsupported."))
+			}
+			SocketAddress::OnionV3 { .. } => {
+				Err(std::io::Error::new(std::io::ErrorKind::Other, "Resolution of OnionV3 \
+				addresses is currently unsupported."))
+			}
+		}
+	}
+}
+
 /// Parses an OnionV3 host and port into a [`SocketAddress::OnionV3`].
 ///
 /// The host part must end with ".onion".
@@ -2681,7 +2714,7 @@ mod tests {
 	use crate::chain::transaction::OutPoint;
 
 	#[cfg(feature = "std")]
-	use std::net::{Ipv4Addr, Ipv6Addr};
+	use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6, ToSocketAddrs};
 	use crate::ln::msgs::SocketAddressParseError;
 
 	#[test]
@@ -4110,4 +4143,22 @@ mod tests {
 		assert!("invalid-address".parse::<SocketAddress>().is_err());
 		assert!(SocketAddress::from_str("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion.onion:1234").is_err());
 	}
+
+	#[test]
+	#[cfg(feature = "std")]
+	fn test_socket_address_to_socket_addrs() {
+		assert_eq!(SocketAddress::TcpIpV4 {addr:[0u8; 4], port: 1337,}.to_socket_addrs().unwrap().next().unwrap(),
+				   SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(0,0,0,0), 1337)));
+		assert_eq!(SocketAddress::TcpIpV6 {addr:[0u8; 16], port: 1337,}.to_socket_addrs().unwrap().next().unwrap(),
+				   SocketAddr::V6(SocketAddrV6::new(Ipv6Addr::from([0u8; 16]), 1337, 0, 0)));
+		assert_eq!(SocketAddress::Hostname { hostname: Hostname::try_from("0.0.0.0".to_string()).unwrap(), port: 0 }
+					   .to_socket_addrs().unwrap().next().unwrap(), SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::from([0u8; 4]),0)));
+		assert!(SocketAddress::OnionV2([0u8; 12]).to_socket_addrs().is_err());
+		assert!(SocketAddress::OnionV3{ ed25519_pubkey: [37, 24, 75, 5, 25, 73, 117, 194, 139, 102,
+			182, 107, 4, 105, 247, 246, 85, 111, 177, 172, 49, 137, 167, 155, 64, 221, 163, 47, 31,
+			33, 71, 3],
+			checksum: 48326,
+			version: 121,
+			port: 1234 }.to_socket_addrs().is_err());
+	}
 }