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

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);