default config options

config.go

@@ -17,7 +17,23 @@ type Proxy struct {
 	Type   string `json:"type,omitempty"` // "tcp", "udp", or "both"
 }
 
+// ReadConfig loads the configuration or generates a default one if missing.
 func ReadConfig(configPath string) ProxyConfig {
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		log.Printf("[INFO] Config file not found, generating default config at %s\n", configPath)
+		defaultConfig := ProxyConfig{
+			Proxy: []Proxy{
+				{
+					Local:  "127.0.0.1:8080",
+					Remote: "127.0.0.1:8081",
+					Type:   "both",
+				},
+			},
+		}
+		saveConfig(configPath, defaultConfig)
+		return defaultConfig
+	}
+
 	configData, err := os.ReadFile(configPath)
 	if err != nil {
 		log.Fatalf("[ERROR] Failed to read config file (%s): %v\n", configPath, err)
@@ -29,3 +45,15 @@ func ReadConfig(configPath string) ProxyConfig {
 	}
 	return config
 }
+
+// saveConfig writes the given configuration to a file.
+func saveConfig(configPath string, config ProxyConfig) {
+	configData, err := json5.MarshalIndent(config, "", "    ")
+	if err != nil {
+		log.Fatalf("[ERROR] Failed to generate default config: %v\n", err)
+	}
+
+	if err := os.WriteFile(configPath, configData, 0644); err != nil {
+		log.Fatalf("[ERROR] Failed to write default config file: %v\n", err)
+	}
+}