ip list supports external file

cmd/gost/main.go

@@ -199,7 +199,7 @@ func initChain() (*gost.Chain, error) {
 		timeout, _ := strconv.Atoi(node.Values.Get("timeout"))
 		node.DialOptions = append(node.DialOptions,
 			gost.TimeoutDialOption(time.Duration(timeout)*time.Second),
-			gost.IPDialOption(strings.Split(node.Values.Get("ip"), ",")...),
+			gost.IPDialOption(parseIP(node.Values.Get("ip"))...),
 		)
 
 		interval, _ := strconv.Atoi(node.Values.Get("ping"))
@@ -478,3 +478,25 @@ func parseUsers(authFile string) (users []*url.Userinfo, err error) {
 	err = scanner.Err()
 	return
 }
+
+func parseIP(s string) (ips []string) {
+	if s == "" {
+		return nil
+	}
+	file, err := os.Open(s)
+	if err != nil {
+		return strings.Split(s, ",")
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		if ip := net.ParseIP(line); ip != nil {
+			ips = append(ips, line)
+		}
+	}
+	return
+}