Updated

EonaCat.DnsTester/EonaCat.DnsTester.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>
-    <TargetFramework>net6.0-windows</TargetFramework>
+    <TargetFramework>net7.0-windows</TargetFramework>
     <UseWindowsForms>true</UseWindowsForms>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
 
@@ -28,5 +28,8 @@
       <Generator>SettingsSingleFileGenerator</Generator>
       <LastGenOutput>Settings.Designer.cs</LastGenOutput>
     </None>
+    <None Update="Servers.xml">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 </Project>

EonaCat.DnsTester/Helpers/DnsHelper.cs

@@ -21,6 +21,7 @@ namespace EonaCat.DnsTester.Helpers
             {
                 client.DontFragment = true;
                 client.EnableBroadcast = false;
+                client.Client.SendTimeout = DnsSendTimeout;
                 client.Client.ReceiveTimeout = DnsReceiveTimeout;
                 byte[] responseBytes = null;
                 if (FakeResponse)
@@ -42,6 +43,7 @@ namespace EonaCat.DnsTester.Helpers
         // For testing purposes
         public static bool FakeResponse { get; set; }
 
+        public static int DnsSendTimeout { get; set; } = 5;
         public static int DnsReceiveTimeout { get; set; } = 5;
 
 

EonaCat.DnsTester/Helpers/UrlHelper.cs

@@ -39,52 +39,55 @@ namespace EonaCat.DnsTester.Helpers
 
                 string url = searchEngine.Value + letters;
 
-                try
+                using (var client = new WebClient())
                 {
-                    using (var client = new WebClient())
+                    string responseString = null;
+                    try
                     {
-                        string responseString = client.DownloadString(url);
+                        responseString = client.DownloadString(url);
+                    }
+                    catch (Exception ex)
+                    {
+                        searchEngineUrls.Remove(searchEngine.Key);
+                        SetStatus($"{searchEngine.Key}: {ex.Message}");
+                    }
 
-                        // find all .xxx.com addresses
-                        MatchCollection hostNames = Regex.Matches(responseString, @"[.](\w+[.]com)");
+                    if (responseString == null)
+                    {
+                        continue;
+                    }
 
-                        // Loop through the match collection to retrieve all matches and delete the leading "."
-                        HashSet<string> uniqueNames = new HashSet<string>();
-                        foreach (Match match in hostNames)
+                    // find all .xxx.com addresses
+                    MatchCollection hostNames = Regex.Matches(responseString, @"[.](\w+[.]com)");
+
+                    // Loop through the match collection to retrieve all matches and delete the leading "."
+                    HashSet<string> uniqueNames = new HashSet<string>();
+                    foreach (Match match in hostNames)
+                    {
+                        string name = match.Groups[1].Value;
+                        if (name != $"{searchEngine.Key.ToLower()}.com")
                         {
-                            string name = match.Groups[1].Value;
-                            if (name != $"{searchEngine.Key.ToLower()}.com")
-                            {
-                                uniqueNames.Add(name);
-                            }
-                        }
-
-                        // Add the names to the list
-                        foreach (string name in uniqueNames)
-                        {
-                            if (urls.Count >= totalUrls)
-                            {
-                                break;
-                            }
-
-                            if (!urls.Contains(name))
-                            {
-                                urls.Add(name);
-                            }
+                            uniqueNames.Add(name);
                         }
                     }
 
-                    await Task.Delay(100);
-                }
-                catch (Exception ex)
-                {
-                    searchEngineUrls.Remove(searchEngine.Key);
-                    SetStatus($"{searchEngine.Key}: {ex.Message}");
-                }
-                finally
-                {
-                    letters = GetRandomLetters();
+                    // Add the names to the list
+                    foreach (string name in uniqueNames)
+                    {
+                        if (urls.Count >= totalUrls)
+                        {
+                            break;
+                        }
+
+                        if (!urls.Contains(name))
+                        {
+                            urls.Add(name);
+                        }
+                    }
                 }
+
+                letters = GetRandomLetters();
+                await Task.Delay(100);
             }
 
             var urlText = "url" + (urls.Count > 1 ? "'s" : string.Empty);

EonaCat.DnsTester/MainForm.cs

@@ -55,12 +55,6 @@ namespace EonaCat.DnsTester
             urls = await UrlHelper.RetrieveUrls(numThreads, numUrlsPerThread);
             AddUrlToView(urls);
 
-
-            if (IsRunning)
-            {
-                return;
-            }
-
             IsRunning = true;
             await Process(_recordType, urls.ToArray(), _dnsServer1, _dnsServer2);
             IsRunning = false;
@@ -199,14 +193,10 @@ namespace EonaCat.DnsTester
 
             for (int i = 0; i < urlsTotal; i++)
             {
-                await Task.Run(async () =>
-                {
-                    var currentUrl = urls[i];
-
-                    await ExecuteDns1(recordType, dnsAddress1, currentUrl, dnsId1, i);
-                    if (!chkDns2.Checked) return;
-                    await ExecuteDns2(recordType, dnsAddress2, currentUrl, dnsId2, i);
-                });
+                var currentUrl = urls[i];
+                await ExecuteDns1(recordType, dnsAddress1, currentUrl, dnsId1, i);
+                if (!chkDns2.Checked) return;
+                await ExecuteDns2(recordType, dnsAddress2, currentUrl, dnsId2, i);
                 await Task.Delay(100);
             }
         }