Set all listen addresses to 0.0.0.0 for testnets

beacon_node/src/config.rs

@@ -5,6 +5,7 @@ use lighthouse_bootstrap::Bootstrapper;
 use rand::{distributions::Alphanumeric, Rng};
 use slog::{crit, info, warn, Logger};
 use std::fs;
+use std::net::Ipv4Addr;
 use std::path::{Path, PathBuf};
 
 pub const DEFAULT_DATA_DIR: &str = ".lighthouse";
@@ -101,6 +102,10 @@ fn process_testnet_subcommand(
         "path" => format!("{:?}", builder.client_config.data_dir)
     );
 
+    // When using the testnet command we listen on all addresses.
+    builder.set_listen_addresses("0.0.0.0".into())?;
+    warn!(log, "All services listening on 0.0.0.0");
+
     // Start matching on the second subcommand (e.g., `testnet bootstrap ...`).
     match cli_args.subcommand() {
         ("bootstrap", Some(cli_args)) => {
@@ -437,6 +442,19 @@ impl<'a> ConfigBuilder<'a> {
         Ok(())
     }
 
+    /// Sets all listening addresses to the given `addr`.
+    pub fn set_listen_addresses(&mut self, addr: String) -> Result<()> {
+        let addr = addr
+            .parse::<Ipv4Addr>()
+            .map_err(|e| format!("Unable to parse default listen address: {:?}", e))?;
+
+        self.client_config.network.listen_address = addr.clone().into();
+        self.client_config.rpc.listen_address = addr.clone();
+        self.client_config.rest_api.listen_address = addr.clone();
+
+        Ok(())
+    }
+
     /// Consumes self, returning the configs.
     ///
     /// The supplied `cli_args` should be the base-level `clap` cli_args (i.e., not a subcommand