feat(traffic): a program to log MDNS traffic

richardschneider · Jul 15, 2019 · d479d16 · d479d16
1 parent e487a7e
commit d479d16
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Showing 3 changed files with 61 additions and 0 deletions.
diff --git a/Mdns.sln b/Mdns.sln
@@ -24,6 +24,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Spike", "Spike\Spike.csproj
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Browser", "Browser\Browser.csproj", "{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "traffic", "traffic\traffic.csproj", "{5E51D502-05E1-4A45-A8D6-6FB3E295D798}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -48,6 +50,10 @@ Global
 		{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A77BEF8C-440E-46F7-ACFC-5EF06EFCA4BA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{5E51D502-05E1-4A45-A8D6-6FB3E295D798}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5E51D502-05E1-4A45-A8D6-6FB3E295D798}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5E51D502-05E1-4A45-A8D6-6FB3E295D798}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5E51D502-05E1-4A45-A8D6-6FB3E295D798}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

diff --git a/traffic/Program.cs b/traffic/Program.cs
@@ -0,0 +1,43 @@
+using Makaretu.Dns;
+using System;
+
+namespace traffic
+{
+    class Program
+    {
+        static readonly object ttyLock = new object();
+
+        static void Main(string[] args)
+        {
+            var mdns = new MulticastService();
+            mdns.NetworkInterfaceDiscovered += (s, e)
+                => mdns.SendQuery(ServiceDiscovery.ServiceName, type: DnsType.PTR);
+            mdns.AnswerReceived += OnGoodDnsMessage;
+            mdns.QueryReceived += OnGoodDnsMessage;
+            mdns.MalformedMessage += OnBadDnsMessage;
+            mdns.Start();
+            Console.ReadKey();
+        }
+
+        private static void OnBadDnsMessage(object sender, byte[] packet)
+        {
+            lock (ttyLock)
+            {
+                Console.WriteLine(">>> {0:O} <<<", DateTime.Now);
+                Console.WriteLine("Malformed message (base64)");
+                Console.WriteLine(Convert.ToBase64String(packet));
+            }
+
+            Environment.Exit(1);
+        }
+
+        private static void OnGoodDnsMessage(object sender, MessageEventArgs e)
+        {
+            lock (ttyLock)
+            {
+                Console.WriteLine("=== {0:O} ===", DateTime.Now);
+                Console.WriteLine(e.Message.ToString());
+            }
+        }
+    }
+}
diff --git a/traffic/traffic.csproj b/traffic/traffic.csproj
@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\src\Mdns.csproj" />
+  </ItemGroup>
+
+</Project>