File gh-pr-31_comments.patch of Package go-mmproxy

From 96395a5a8d028b18b824614affda819511656b86 Mon Sep 17 00:00:00 2001
From: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
Date: Sun, 26 May 2024 16:48:27 +0200
Subject: [PATCH] Skip comments and empty lines in subnets file

Make parsing more resilient and allow for annotations.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>
---
 main.go | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/main.go b/main.go
index aa67bc5..56a21a0 100644
--- a/main.go
+++ b/main.go
@@ -84,12 +84,15 @@ func loadAllowedSubnets() error {
 
 	scanner := bufio.NewScanner(file)
 	for scanner.Scan() {
-		_, ipNet, err := net.ParseCIDR(scanner.Text())
-		if err != nil {
-			return err
+		line := scanner.Text()
+		if len(line) > 0 && line[0] != '#' {
+			_, ipNet, err := net.ParseCIDR(line)
+			if err != nil {
+				return err
+			}
+			Opts.AllowedSubnets = append(Opts.AllowedSubnets, ipNet)
+			Opts.Logger.Info("allowed subnet", slog.String("subnet", ipNet.String()))
 		}
-		Opts.AllowedSubnets = append(Opts.AllowedSubnets, ipNet)
-		Opts.Logger.Info("allowed subnet", slog.String("subnet", ipNet.String()))
 	}
 
 	return nil