Add EIP-7636 support (#6793)

* Add eip7636 support

* Add `version()` to the `lighthouse_version` crate and make the `enr.rs` file use it.

* Hardcode version, Add `client_name()`, remove unneeded flag.

* Make it use the new function.

* Make cargo fmt zip it

beacon_node/lighthouse_network/src/config.rs

@@ -116,7 +116,8 @@ pub struct Config {
     pub network_load: u8,
 
     /// Indicates if the user has set the network to be in private mode. Currently this
-    /// prevents sending client identifying information over identify.
+    /// prevents sending client identifying information over identify and prevents
+    /// EIP-7636 indentifiable information being provided in the ENR.
     pub private: bool,
 
     /// Shutdown beacon node after sync is completed.

beacon_node/lighthouse_network/src/discovery/enr.rs

@@ -8,6 +8,7 @@ use crate::types::{Enr, EnrAttestationBitfield, EnrSyncCommitteeBitfield};
 use crate::NetworkConfig;
 use alloy_rlp::bytes::Bytes;
 use libp2p::identity::Keypair;
+use lighthouse_version::{client_name, version};
 use slog::{debug, warn};
 use ssz::{Decode, Encode};
 use ssz_types::BitVector;
@@ -188,6 +189,11 @@ pub fn build_enr<E: EthSpec>(
         builder.udp6(udp6_port.get());
     }
 
+    // Add EIP 7636 client information
+    if !config.private {
+        builder.client_info(client_name().to_string(), version().to_string(), None);
+    }
+
     // Add QUIC fields to the ENR.
     // Since QUIC is used as an alternative transport for the libp2p protocols,
     // the related fields should only be added when both QUIC and libp2p are enabled

common/lighthouse_version/src/lib.rs

@@ -48,6 +48,22 @@ pub fn version_with_platform() -> String {
     format!("{}/{}-{}", VERSION, Target::arch(), Target::os())
 }
 
+/// Returns semantic versioning information only.
+///
+/// ## Example
+///
+/// `1.5.1`
+pub fn version() -> &'static str {
+    "6.0.1"
+}
+
+/// Returns the name of the current client running.
+///
+/// This will usually be "Lighthouse"
+pub fn client_name() -> &'static str {
+    "Lighthouse"
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -64,4 +80,14 @@ mod test {
             VERSION
         );
     }
+
+    #[test]
+    fn semantic_version_formatting() {
+        let re = Regex::new(r"^[0-9]+\.[0-9]+\.[0-9]+").unwrap();
+        assert!(
+            re.is_match(version()),
+            "semantic version doesn't match regex: {}",
+            version()
+        );
+    }
 }