C#•16mo ago

❔ SSH.Net trying to build a interactive shell

I am trying to build a ssh terminal in C#, but i am not able to output text from the streams (the code is a melting pot of pieces, and currently following a similar project): I notice that i need to write something back to able to "refresh" the output stream. CODE in comments

8 Replies

valentimarcoOP•16mo ago

main:
  var connection = new SSHConnection(host, username, password);
string text = await connection.ReadStream();

Console.WriteLine(text);
connection.WriteStream("ls");
text = await connection.ReadStream();
Console.WriteLine(text);

Console.ReadLine();


classes:

class SSHConnection : IDisposable{
    private string _host;
    private string _username;
    private string _password;
    private StreamWriter _writer;
    private StreamReader _reader;
    //private MemoryStream _memory = new ();
    private String _lastcommand;
    private SshClient _client;
    private ShellStream _shellStream;
    
    public SSHConnection(string host, string username, string password){
        _client = new SshClient(host, username, password);
        _client.Connect();
        if(!_client.IsConnected) throw new Exception("Client not connected.");
        
        var terminalModes = new Dictionary<TerminalModes, uint>();
        terminalModes[TerminalModes.TTY_OP_ISPEED] = 0x00009600;
        terminalModes[TerminalModes.TTY_OP_OSPEED] = 0x00009600;
        _shellStream = _client.CreateShellStream("xterm", 80, 24, 800, 600, 1024,terminalModes);
        
       
        _writer = new StreamWriter(_shellStream) {AutoFlush = true};
        _reader = new StreamReader(_shellStream);
        
        
    }

    public async Task<string> ReadStream(){
        var buffer = new char[4096];
        var read = await _reader.ReadAsync(buffer, 0, buffer.Length);
        var input = new string(buffer, 0, read);
        return input;
        
    }
    
    public void WriteStream(string command){
        while (_shellStream.Length == 0)
            Thread.Sleep(500);
        _writer.WriteLine(command);
        _writer.Flush();
        _lastcommand = command;
    }
    
    public void Dispose(){
        _writer.Dispose();
        _reader.Dispose();
        _client.Disconnect();
        _client.Dispose();
    }
    
    
}

main:
  var connection = new SSHConnection(host, username, password);
string text = await connection.ReadStream();

Console.WriteLine(text);
connection.WriteStream("ls");
text = await connection.ReadStream();
Console.WriteLine(text);

Console.ReadLine();


classes:

class SSHConnection : IDisposable{
    private string _host;
    private string _username;
    private string _password;
    private StreamWriter _writer;
    private StreamReader _reader;
    //private MemoryStream _memory = new ();
    private String _lastcommand;
    private SshClient _client;
    private ShellStream _shellStream;
    
    public SSHConnection(string host, string username, string password){
        _client = new SshClient(host, username, password);
        _client.Connect();
        if(!_client.IsConnected) throw new Exception("Client not connected.");
        
        var terminalModes = new Dictionary<TerminalModes, uint>();
        terminalModes[TerminalModes.TTY_OP_ISPEED] = 0x00009600;
        terminalModes[TerminalModes.TTY_OP_OSPEED] = 0x00009600;
        _shellStream = _client.CreateShellStream("xterm", 80, 24, 800, 600, 1024,terminalModes);
        
       
        _writer = new StreamWriter(_shellStream) {AutoFlush = true};
        _reader = new StreamReader(_shellStream);
        
        
    }

    public async Task<string> ReadStream(){
        var buffer = new char[4096];
        var read = await _reader.ReadAsync(buffer, 0, buffer.Length);
        var input = new string(buffer, 0, read);
        return input;
        
    }
    
    public void WriteStream(string command){
        while (_shellStream.Length == 0)
            Thread.Sleep(500);
        _writer.WriteLine(command);
        _writer.Flush();
        _lastcommand = command;
    }
    
    public void Dispose(){
        _writer.Dispose();
        _reader.Dispose();
        _client.Disconnect();
        _client.Dispose();
    }
    
    
}

(The environment runs in local network)

valentimarcoOP•16mo ago

when i don't write anything in the "input shell" stream

Omnissiah•16mo ago

there is some mess in this code if you are using _reader like that you wouldn't really need it, since _shellStream already has ReadAsync (also im pretty sure vs is giving you some hints on that to use a different overload) then when write you are not using async version and then you are using Thread.Sleep instead of Task.Delay also i would not call CreateShellStresm in a constructor because it's sending data, so it could throw exceptions (it's not great, i know) having said this, i tried to use ssh.net in the beginning and was not satisfied so then i tried to use plink instead then tried ssh.net and it started working for me, tho' i admit it's not the best code i have seen

Atronil•16mo ago

take a look for this github project https://github.com/AMuhaimin/sshTerminal

GitHub

GitHub - AMuhaimin/sshTerminal: Simple SSH Terminal dari c#

Simple SSH Terminal dari c#. Contribute to AMuhaimin/sshTerminal development by creating an account on GitHub.

Omnissiah•16mo ago

why on earth there is a nupkg committed in the folder

Atronil•16mo ago

i dont know )

valentimarcoOP•16mo ago

i copied some code from others xd

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ SSH.Net trying to build a interactive shell