Update: The new API required to make this work (SshConsole.GetInputStream(), SshConsole.GetOutputStream(), SshConsole.GetErrorStream() and FileServer.Settings.SshParameters.CompressionLevel) has been added to Rebex File Server 2017 R4: https://www.rebex.net/file-server/history.aspx#2017R4
You are right, Rebex File Server doesn't support executing external commands. Its simplified virtual shell is mostly supposed to complement SFTP and SCP protocols and all the built-in commands only work with the virtual file system.
However, what you are trying to do is a very interesting scenario and it actually turned out that adding support for it is quite simple - we just had to enhance the internals a bit and make the inner streams accessible through SshConsole, which is passed with ShellCommand event arguments.
You can give this a try as well - just sent you a link to the current beta build.
We have not sufficiently tested this yet, but I was able to clone a 300 MB repository without any issues by running hg clone ssh://demo@localhost:8022/repository_name against this proof-of-concept server app:
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Rebex.Net;
using Rebex.Net.Servers;
namespace Rebex.Samples
{
public class MercurialServer
{
// path to mercurial
private const string MercurialPath = @"c:\Program Files\TortoiseHg\hg.exe";
// path to a directory that contains the repositories
private const string RepositoryRoot = @"c:\data\repository";
// buffer size for data proxy
private const int BufferSize = 32 * 1024;
// log writer
private static readonly ILogWriter LogWriter = new ConsoleLogWriter(LogLevel.Debug);
// user name
private const string UserName = "demo";
// password
private const string Password = "password";
// server port
private const int ServerPort = 8022;
// server key
private const string ServerKey = @"-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
";
public static void Main()
{
var server = new FileServer();
// enable logging
server.LogWriter = LogWriter;
// bind SSH shell subsystem to the specified port
server.Bind(ServerPort, FileServerProtocol.Shell);
// use the embedded private key for the sake of simplicity
server.Keys.Add(new SshPrivateKey(new MemoryStream(Encoding.ASCII.GetBytes(ServerKey)), "password"));
// only one user is supported for now
server.Users.Add(UserName, Password);
// custom command handler
server.ShellCommand += (sender, e) =>
{
switch (e.Command)
{
case "hg":
// intercept "hg" command
e.Action = RunMercurial;
break;
default:
// reject all other commands (optional)
e.WriteLine("Command not supported.");
e.ExitCode = 127;
break;
}
};
server.Start();
Console.WriteLine("Server is running, press any key to stop it.");
Console.ReadKey(true);
}
public static int RunMercurial(string[] args, SshConsole console)
{
// start Mercurial
var info = new ProcessStartInfo(MercurialPath, PrepareArguments(args));
info.WorkingDirectory = RepositoryRoot;
info.CreateNoWindow = true;
info.UseShellExecute = false;
info.RedirectStandardInput = true;
info.RedirectStandardOutput = true;
info.RedirectStandardError = true;
var process = Process.Start(info);
// proxy stdin/stdout/stderr
Stream consoleInput = console.GetInputStream();
Stream consoleOutput = console.GetOutputStream();
Stream consoleError = console.GetErrorStream() ?? Stream.Null; // error stream is only available in terminal-less mode
Stream processInput = process.StandardInput.BaseStream;
Stream processOutput = process.StandardOutput.BaseStream;
Stream processError = process.StandardError.BaseStream;
CopyAllAsync("stdin", consoleInput, processInput);
CopyAllAsync("stderr", processError, consoleError);
CopyAllAsync("stdout", processOutput, consoleOutput);
// wait for the process to end
process.WaitForExit();
// return the exit code
return process.ExitCode;
}
private static string PrepareArguments(string[] args)
{
// TODO: This method is supposed to convert the argument array into a string,
// but it is not yet implemented properly - if any of the arguments contains whitespaces or quotes,
// this produces wrong results.
// TODO: But if the users are only supposed to have SSH access to Mercurial repositories,
// we should only allow "-R REPO_NAME serve --stdio" or its variants anyway.
return string.Join(" ", args);
}
private static Task CopyAllAsync(string name, Stream input, Stream output)
{
// TODO: Error handling is missing.
return Task.Run(() =>
{
byte[] buffer = new byte[BufferSize];
while (true)
{
int n = input.Read(buffer, 0, buffer.Length);
//Console.WriteLine("{0}: {1} bytes", name, n);
if (n == 0)
{
output.Close();
break;
}
output.Write(buffer, 0, n);
output.Flush();
}
});
}
}
}
commented
by
Lukas Pokorny
(148k points)
commented
by
Lukas Matyska
(73.5k points)