From d36f662c383492ac820a971f15fd8df286e6b82e Mon Sep 17 00:00:00 2001
From: chenfyun <chenfwulei@gmail.com>
Date: Thu, 17 Jul 2025 15:46:37 +0800
Subject: [PATCH] Update main.go

feat: display usage/help information when no command-line arguments are passed
---
 main.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/main.go b/main.go
index aa67bc5..b459796 100644
--- a/main.go
+++ b/main.go
@@ -96,6 +96,11 @@ func loadAllowedSubnets() error {
 }
 
 func main() {
+	if len(os.Args) == 1 {
+		flag.Usage()
+		os.Exit(0)
+	}
+	
 	flag.Parse()
 	lvl := slog.LevelInfo
 	if Opts.Verbose > 0 {