core: sanity check about the config file

Signed-off-by: Vincenzo Palazzo <[email protected]>

ldk-server/src/main.rs

@@ -15,6 +15,7 @@ use hyper_util::rt::TokioIo;
 
 use crate::util::config::load_config;
 use ldk_node::config::Config;
+use std::fs;
 use std::path::Path;
 use std::sync::Arc;
 
@@ -39,6 +40,11 @@ fn main() {
 		std::process::exit(0);
 	}
 
+	if fs::File::open(arg).is_err() {
+		eprintln!("Invalid configuration file path: {}", arg);
+		std::process::exit(-1);
+	}
+
 	let mut ldk_node_config = Config::default();
 	let config_file = load_config(Path::new(arg)).expect("Invalid configuration file.");