Add support for registering hidden services

Usage:

```
add
  Adds a service to register on the Tor network

Usage:
  tor [options] add <name> <service>

Arguments:
  <name>     Name of the service to register
  <service>  Address and port of the local service being registered, such as 127.0.0.1:8080

Options:
  -p, --port <port>  Optional port on the Tor network to listen on, if different than the service port
  -?, -h, --help     Show help and usage information
```

Service directory is set to `~/tor/[name]` since the service keys and address should be reused across tool reinstalls/updates (especially updates of the tor binaries themselves).

The configuration is saved to `~/tor/.netconfig` so it's also preserved across reinstalls.

Example configuration:

```
[tor]
 proxy = 1337
 socks = 1338
 control = 1339

[tor "echo"]
 port = 8080
 service = 127.0.0.1:8080
```

The `torrc` file is updated accordingly after configuration and before starting, so that it picks up our changes.

> NOTE: this is possible because we depend on our fork of TorSharp which implements the fix proposed in joelverhagen/TorSharp#70.

Fixes #1

.gitignore

@@ -4,6 +4,7 @@ artifacts
 pack
 .vs
 .vscode
+/tor
 
 *.suo
 *.sdf

dotnet-tor.sln

@@ -7,7 +7,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dotnet-tor", "src\dotnet-to
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{95AB91E3-8D17-486B-A99D-1E074A054655}"
 	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
 		readme.md = readme.md
+		tor.cmd = tor.cmd
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TorSharp", "external\TorSharp\src\TorSharp\TorSharp.csproj", "{350FC483-DA36-4273-90C6-9808D87F5115}"

src/dotnet-tor/AddCommand.cs

@@ -0,0 +1,26 @@
+using System;
+using System.CommandLine;
+using System.CommandLine.Invocation;
+using System.Threading;
+
+class AddCommand : Command
+{
+    public AddCommand() : base("add", "Adds a service to register on the Tor network")
+    {
+        Add(new Argument<string>("name", "Name of the service to register"));
+        Add(new Argument<string>("service", "Address and port of the local service being registered, such as 127.0.0.1:8080"));
+        Add(new Option<int?>(new[] { "--port", "-p" }, "Optional port on the Tor network to listen on, if different than the service port"));
+
+        Handler = CommandHandler.Create<string, int?, string, CancellationToken>(Run);
+    }
+
+    static void Run(string name, int? port, string service, CancellationToken cancellation)
+    {
+        if (!Uri.TryCreate("http://" + service, UriKind.Absolute, out var uri))
+            throw new ArgumentException("Service specified is not valid. It should be an IP:PORT combination: " + service);
+
+        Tor.Config.GetSection("tor", name)
+           .SetNumber("port", port ?? uri.Port)
+           .SetString("service", service);
+    }
+}

src/dotnet-tor/ConfigureCommand.cs → src/dotnet-tor/ConfigCommand.cs

@@ -10,23 +10,19 @@
 using Knapcode.TorSharp;
 using Spectre.Console;
 
-class ConfigureCommand : Command
+class ConfigCommand : Command
 {
-    readonly string torPath;
-
-    public ConfigureCommand(string torPath) : base("config", "Edits the full torrc configuration file.")
+    public ConfigCommand() : base("config", "Edits the full torrc configuration file.")
     {
-        this.torPath = torPath;
         Handler = CommandHandler.Create(RunAsync);
     }
 
     async Task RunAsync()
     {
         var settings = new TorSharpSettings
         {
-
-            ZippedToolsDirectory = Path.Combine(torPath, "zip"),
-            ExtractedToolsDirectory = Path.Combine(torPath, "bin"),
+            ZippedToolsDirectory = Path.Combine(Tor.AppPath, "zip"),
+            ExtractedToolsDirectory = Path.Combine(Tor.AppPath, "bin"),
         };
 
         var zipPath = await AnsiConsole.Status().StartAsync("Fetching Tor tools", async _ =>
@@ -49,7 +45,6 @@ async Task RunAsync()
         var torProxy = new TorSharpProxy(settings);
         await torProxy.ConfigureAsync();
 
-        // TODO: won't exist yet because the tools aren't unzipped yet.
         if (File.Exists(configPath))
             Process.Start(editor, configPath);
     }

src/dotnet-tor/Program.cs

@@ -32,35 +32,11 @@
         AnsiConsole.MarkupLine($"[yellow]New version v{update.Identity.Version} from {(DateTimeOffset.Now - (update.Published ?? DateTimeOffset.Now)).Humanize()} ago is available.[/] Update with: [lime]dotnet tool update -g dotnet-echo[/]");
 }
 
-var appPath = GetApplicationPath();
 #if !CI
-AnsiConsole.MarkupLine($"[yellow]AppPath: {appPath}[/]");
+AnsiConsole.MarkupLine($"[yellow]AppPath: {Tor.AppPath}[/]");
 #endif
 
-await new TorCommand(appPath).WithConfigurableDefaults("tor").InvokeAsync(args);
-
-// See GCM's Program.cs
-static string GetApplicationPath()
-{
-    // Assembly::Location always returns an empty string if the application was published as a single file
-#pragma warning disable IL3000
-    bool isSingleFile = string.IsNullOrEmpty(Assembly.GetEntryAssembly()?.Location);
-#pragma warning restore IL3000
-
-    // Use "argv[0]" to get the full path to the entry executable - this is consistent across
-    // .NET Framework and .NET >= 5 when published as a single file.
-    string[] args = Environment.GetCommandLineArgs();
-    string candidatePath = args[0];
-
-    // If we have not been published as a single file on .NET 5 then we must strip the ".dll" file extension
-    // to get the default AppHost/SuperHost name.
-    if (!isSingleFile && Path.HasExtension(candidatePath))
-    {
-        return Path.ChangeExtension(candidatePath, null);
-    }
-
-    return candidatePath;
-}
+await new TorCommand().InvokeAsync(args);
 
 static Task<IPackageSearchMetadata> GetUpdateAsync() => AnsiConsole.Status().StartAsync("Checking for updates", async context =>
 {

src/dotnet-tor/Properties/launchSettings.json

@@ -2,7 +2,7 @@
   "profiles": {
     "dotnet-tor": {
       "commandName": "Project",
-      "commandLineArgs": "-?"
+      "commandLineArgs": "add -?"
     }
   }
 }

src/dotnet-tor/Tor.cs

@@ -0,0 +1,42 @@
+using System;
+using System.IO;
+using System.Reflection;
+using DotNetConfig;
+
+static class Tor
+{
+    public static string AppPath { get; } = GetApplicationPath();
+
+    public static string DataDir { get; } = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+        "tor");
+
+    // We rebuild on every request since other code can mutate the 
+    // immutable structure and cause this property to become out of 
+    // sync with the persisted state.
+    public static Config Config => Config.Build(Path.Combine(DataDir, Config.FileName));
+
+    // See GCM's Program.cs
+    static string GetApplicationPath()
+    {
+        // Assembly::Location always returns an empty string if the application was published as a single file
+#pragma warning disable IL3000
+        bool isSingleFile = string.IsNullOrEmpty(Assembly.GetEntryAssembly()?.Location);
+#pragma warning restore IL3000
+
+        // Use "argv[0]" to get the full path to the entry executable - this is consistent across
+        // .NET Framework and .NET >= 5 when published as a single file.
+        string[] args = Environment.GetCommandLineArgs();
+        string candidatePath = args[0];
+
+        // If we have not been published as a single file on .NET 5 then we must strip the ".dll" file extension
+        // to get the default AppHost/SuperHost name.
+        if (!isSingleFile && Path.HasExtension(candidatePath))
+        {
+            return Path.ChangeExtension(candidatePath, null);
+        }
+
+        return candidatePath;
+    }
+}
+

src/dotnet-tor/TorCommand.cs

@@ -2,8 +2,8 @@
 using System.CommandLine;
 using System.CommandLine.Invocation;
 using System.IO;
+using System.Linq;
 using System.Net.Http;
-using System.Security.Cryptography;
 using System.Threading;
 using System.Threading.Tasks;
 using DotNetConfig;
@@ -13,19 +13,19 @@
 class TorCommand : RootCommand
 {
     const string ControlPassword = "7B002936-978D-46D3-9C96-7579F97F333E";
-    static readonly ConfigSection config = Config.Build().GetSection("tor");
+    const string ConfigDelimiter = "#! dotnet-tor";
 
-    string torPath;
 
-    public TorCommand(string torPath) : base("Tor proxy service")
+    public TorCommand() : base("Tor proxy service")
     {
-        this.torPath = torPath;
+        var config = Tor.Config.GetSection("tor");
 
         Add(new Option<int>(new[] { "--proxy", "-p" }, () => (int?)config.GetNumber("proxy") ?? 1337, "Proxy port"));
         Add(new Option<int>(new[] { "--socks", "-s" }, () => (int?)config.GetNumber("socks") ?? 1338, "Socks port"));
         Add(new Option<int>(new[] { "--control", "-c" }, () => (int?)config.GetNumber("control") ?? 1339, "Control port"));
 
-        Add(new ConfigureCommand(torPath));
+        Add(new AddCommand());
+        Add(new ConfigCommand());
 
         Handler = CommandHandler.Create<int, int, int, CancellationToken>(RunAsync);
     }
@@ -34,8 +34,8 @@ async Task RunAsync(int proxy, int socks, int control, CancellationToken cancell
     {
         var settings = new TorSharpSettings
         {
-            ZippedToolsDirectory = Path.Combine(torPath, "zip"),
-            ExtractedToolsDirectory = Path.Combine(torPath, "bin"),
+            ZippedToolsDirectory = Path.Combine(Tor.AppPath, "zip"),
+            ExtractedToolsDirectory = Path.Combine(Tor.AppPath, "bin"),
             PrivoxySettings =
             {
                 Port = proxy,
@@ -45,18 +45,86 @@ async Task RunAsync(int proxy, int socks, int control, CancellationToken cancell
                 ControlPassword = ControlPassword,
                 SocksPort = socks,
                 ControlPort = control,
+                //DataDirectory = Tor.DataDir,
             },
         };
 
-        await AnsiConsole.Status().StartAsync("Fetching Tor tools",
-            async _ => await new TorSharpToolFetcher(settings, new HttpClient()).FetchAsync());
+        var zipPath = await AnsiConsole.Status().StartAsync("Fetching Tor tools", async _ =>
+        {
+            var fetcher = new TorSharpToolFetcher(settings, new HttpClient());
+            var updates = await fetcher.CheckForUpdatesAsync();
+            await fetcher.FetchAsync(updates);
+            return updates.Tor.DestinationPath;
+        });
 
         cancellation.ThrowIfCancellationRequested();
         var tor = new TorSharpProxy(settings);
 
-        await tor.ConfigureAndStartAsync();
+        await tor.ConfigureAsync();
         cancellation.ThrowIfCancellationRequested();
 
+        var configPath = Path.Combine(
+            settings.ExtractedToolsDirectory,
+            Path.GetFileNameWithoutExtension(zipPath),
+            "Data", "Tor", "torrc");
+
+        if (!File.Exists(configPath))
+            throw new ArgumentException($"Tor configuration file not found at expected location {configPath}");
+
+        var torConfig = Tor.Config;
+
+        // Clear dotnet-tor configuration from previous runs.
+        var allLines = (await File.ReadAllLinesAsync(configPath, cancellation)).ToList();
+        var begin = allLines.IndexOf(ConfigDelimiter);
+
+        if (begin != -1)
+        {
+            var end = allLines.LastIndexOf(ConfigDelimiter);
+            allLines.RemoveRange(begin, end != -1 && end != begin ? end - begin + 1 : allLines.Count - begin);
+            await File.WriteAllLinesAsync(configPath, allLines.Where(line => !string.IsNullOrEmpty(line)), cancellation);
+        }
+
+        var services = torConfig
+            .Where(x => x.Section == "tor" && x.Subsection != null)
+            .Select(x => x.Subsection!)
+            .Distinct().ToList();
+
+        if (services.Count > 0)
+        {
+            await File.AppendAllLinesAsync(configPath, new[] { ConfigDelimiter }, cancellation);
+            foreach (var service in services)
+            {
+                var config = torConfig.GetSection("tor", service);
+                var serviceDir = Path.Combine(Tor.DataDir, service);
+                await File.AppendAllLinesAsync(configPath, new[]
+                {
+                    "HiddenServiceDir " + serviceDir,
+                    $"HiddenServicePort {config.GetNumber("port")} {config.GetString("service")}"
+                }, cancellation);
+            }
+            await File.AppendAllLinesAsync(configPath, new[] { ConfigDelimiter }, cancellation);
+        }
+
+        await tor.StartAsync();
+        cancellation.ThrowIfCancellationRequested();
+
+        // Save successfully run args as settings
+        Tor.Config.GetSection("tor")
+           .SetNumber("proxy", proxy)
+           .SetNumber("socks", socks)
+           .SetNumber("control", control);
+
+        foreach (var service in services)
+        {
+            var hostName = Path.Combine(Tor.DataDir, service, "hostname");
+            if (File.Exists(hostName))
+            {
+                var config = torConfig.GetSection("tor", service);
+                var onion = await File.ReadAllTextAsync(hostName, cancellation);
+                AnsiConsole.MarkupLine($"[yellow]Service {service} ({config.GetString("service")}):[/] [lime]{onion.Trim()}[/]");
+            }
+        }
+
         while (!cancellation.IsCancellationRequested)
             Thread.Sleep(100);
     }

src/dotnet-tor/dotnet-tor.csproj

@@ -15,7 +15,7 @@
 
 Usage:
 
-> dotnet tor -?
+> dotnet tor -?
 tor
   Tor proxy service
 
@@ -36,9 +36,9 @@ Commands:
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="DotNetConfig.CommandLine" Version="1.0.3" />
-    <!--<PackageReference Include="Knapcode.TorSharp" Version="2.6.0" />-->
+    <PackageReference Include="DotNetConfig" Version="1.0.3" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="all" />
+    <PackageReference Include="System.CommandLine" Version="2.0.0-beta1.21216.1" />
     <PackageReference Include="ThisAssembly" Version="1.0.8" />
     <PackageReference Include="NuGet.Protocol" Version="5.9.1" />
     <PackageReference Include="Spectre.Console" Version="0.39.0" />

tor.cmd

@@ -0,0 +1,4 @@
+@echo off
+pushd src\dotnet-tor\bin\Debug
+tor %*
+popd