From 6623c6f9f1316923ec2b9bc692413dd089789503 Mon Sep 17 00:00:00 2001
From: thepra <thepra@pm.me>
Date: Thu, 15 Oct 2026 11:36:14 +0200
Subject: [PATCH] me-web? 0.5.1: the route from the server back to you arrives

- With the test from outside, the route from the publisher's server back to your address
  came back empty: the trace program holds its output until it ends, and it was stopped
  first while waiting on routers that never answer. It now reports each router as soon as it
  answers and stops after three silent ones, so the routers in front of your provider's exit
  reach the app.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB
---
 Directory.Build.props            |  2 +-
 src/MeWeb.Server/ProbeService.cs | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/Directory.Build.props b/Directory.Build.props
index 446456e..71e49a5 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>0.5.0</Version>
+    <Version>0.5.1</Version>
     <Product>me-web?</Product>
     <Company>Arasaka di Hvozdikov Yevheniy</Company>
     <Copyright>© 2026 Arasaka di Hvozdikov Yevheniy</Copyright>
diff --git a/src/MeWeb.Server/ProbeService.cs b/src/MeWeb.Server/ProbeService.cs
index 023cca9..8d0fa19 100644
--- a/src/MeWeb.Server/ProbeService.cs
+++ b/src/MeWeb.Server/ProbeService.cs
@@ -95,18 +95,21 @@ public partial class ProbeService(IOptionsMonitor<ProbeOptions> options, ILogger
     await tracing.WaitAsync(ct);
     try
     {
-      var info = new ProcessStartInfo("tracepath") { RedirectStandardOutput = true, RedirectStandardError = true, UseShellExecute = false };
-      foreach (var argument in new[] { "-n", "-m", "16", target.ToString() }) info.ArgumentList.Add(argument);
+      var info = new ProcessStartInfo("stdbuf") { RedirectStandardOutput = true, RedirectStandardError = true, UseShellExecute = false };
+      foreach (var argument in new[] { "-oL", "tracepath", "-n", "-m", "16", target.ToString() }) info.ArgumentList.Add(argument);
       using var process = Process.Start(info);
       if (process is null) return hops;
       using var timeout = CancellationTokenSource.CreateLinkedTokenSource(ct);
       timeout.CancelAfter(TimeSpan.FromSeconds(25));
       try
       {
+        var silent = 0;
         while (await process.StandardOutput.ReadLineAsync(timeout.Token) is { } line)
         {
+          if (SilentLine().IsMatch(line) && ++silent >= 3) break;
           var match = HopLine().Match(line);
           if (!match.Success || !IPAddress.TryParse(match.Groups[2].Value, out var address)) continue;
+          silent = 0;
           var distance = int.Parse(match.Groups[1].Value, CultureInfo.InvariantCulture);
           if (hops.Any(h => h.Distance == distance)) continue;
           if (!IsPublic(address) || Refuse(address) is not null) continue;
@@ -148,6 +151,9 @@ public partial class ProbeService(IOptionsMonitor<ProbeOptions> options, ILogger
   [GeneratedRegex(@"^\s*(\d+):\s+([0-9a-fA-F.:]+)\s+([\d.]+)ms")]
   internal static partial Regex HopLine();
 
+  [GeneratedRegex(@"^\s*\d+:\s+no reply")]
+  internal static partial Regex SilentLine();
+
   async Task<ProbeOutcome> Knock(Ticket ticket, int port, CancellationToken ct)
   {
     await outbound.WaitAsync(ct);