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SshClient.cs
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SshClient.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Net;
using System.Text;
using Renci.SshNet.Common;
namespace Renci.SshNet
{
/// <summary>
/// Provides client connection to SSH server.
/// </summary>
public class SshClient : BaseClient
{
/// <summary>
/// Holds the list of forwarded ports.
/// </summary>
private readonly List<ForwardedPort> _forwardedPorts;
/// <summary>
/// Holds a value indicating whether the current instance is disposed.
/// </summary>
/// <value>
/// <see langword="true"/> if the current instance is disposed; otherwise, <see langword="false"/>.
/// </value>
private bool _isDisposed;
private MemoryStream _inputStream;
/// <summary>
/// Gets the list of forwarded ports.
/// </summary>
public IEnumerable<ForwardedPort> ForwardedPorts
{
get
{
return _forwardedPorts.AsReadOnly();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient" /> class.
/// </summary>
/// <param name="connectionInfo">The connection info.</param>
/// <exception cref="ArgumentNullException"><paramref name="connectionInfo"/> is <see langword="null"/>.</exception>
public SshClient(ConnectionInfo connectionInfo)
: this(connectionInfo, ownsConnectionInfo: false)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="host">Connection host.</param>
/// <param name="port">Connection port.</param>
/// <param name="username">Authentication username.</param>
/// <param name="password">Authentication password.</param>
/// <exception cref="ArgumentNullException"><paramref name="password"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="host"/> is invalid, or <paramref name="username"/> is <see langword="null"/> or contains only whitespace characters.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="port"/> is not within <see cref="IPEndPoint.MinPort"/> and <see cref="IPEndPoint.MaxPort"/>.</exception>
[SuppressMessage("Microsoft.Reliability", "C2A000:DisposeObjectsBeforeLosingScope", Justification = "Disposed in Dispose(bool) method.")]
public SshClient(string host, int port, string username, string password)
#pragma warning disable CA2000 // Dispose objects before losing scope
: this(new PasswordConnectionInfo(host, port, username, password), ownsConnectionInfo: true)
#pragma warning restore CA2000 // Dispose objects before losing scope
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="host">Connection host.</param>
/// <param name="username">Authentication username.</param>
/// <param name="password">Authentication password.</param>
/// <exception cref="ArgumentNullException"><paramref name="password"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="host"/> is invalid, or <paramref name="username"/> is <see langword="null"/> or contains only whitespace characters.</exception>
public SshClient(string host, string username, string password)
: this(host, ConnectionInfo.DefaultPort, username, password)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="host">Connection host.</param>
/// <param name="port">Connection port.</param>
/// <param name="username">Authentication username.</param>
/// <param name="keyFiles">Authentication private key file(s) .</param>
/// <exception cref="ArgumentNullException"><paramref name="keyFiles"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="host"/> is invalid, -or- <paramref name="username"/> is <see langword="null"/> or contains only whitespace characters.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="port"/> is not within <see cref="IPEndPoint.MinPort"/> and <see cref="IPEndPoint.MaxPort"/>.</exception>
[SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope", Justification = "Disposed in Dispose(bool) method.")]
public SshClient(string host, int port, string username, params IPrivateKeySource[] keyFiles)
: this(new PrivateKeyConnectionInfo(host, port, username, keyFiles), ownsConnectionInfo: true)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="host">Connection host.</param>
/// <param name="username">Authentication username.</param>
/// <param name="keyFiles">Authentication private key file(s) .</param>
/// <exception cref="ArgumentNullException"><paramref name="keyFiles"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentException"><paramref name="host"/> is invalid, -or- <paramref name="username"/> is <see langword="null"/> or contains only whitespace characters.</exception>
public SshClient(string host, string username, params IPrivateKeySource[] keyFiles)
: this(host, ConnectionInfo.DefaultPort, username, keyFiles)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="connectionInfo">The connection info.</param>
/// <param name="ownsConnectionInfo">Specified whether this instance owns the connection info.</param>
/// <exception cref="ArgumentNullException"><paramref name="connectionInfo"/> is <see langword="null"/>.</exception>
/// <remarks>
/// If <paramref name="ownsConnectionInfo"/> is <see langword="true"/>, then the
/// connection info will be disposed when this instance is disposed.
/// </remarks>
private SshClient(ConnectionInfo connectionInfo, bool ownsConnectionInfo)
: this(connectionInfo, ownsConnectionInfo, new ServiceFactory())
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SshClient"/> class.
/// </summary>
/// <param name="connectionInfo">The connection info.</param>
/// <param name="ownsConnectionInfo">Specified whether this instance owns the connection info.</param>
/// <param name="serviceFactory">The factory to use for creating new services.</param>
/// <exception cref="ArgumentNullException"><paramref name="connectionInfo"/> is <see langword="null"/>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="serviceFactory"/> is <see langword="null"/>.</exception>
/// <remarks>
/// If <paramref name="ownsConnectionInfo"/> is <see langword="true"/>, then the
/// connection info will be disposed when this instance is disposed.
/// </remarks>
internal SshClient(ConnectionInfo connectionInfo, bool ownsConnectionInfo, IServiceFactory serviceFactory)
: base(connectionInfo, ownsConnectionInfo, serviceFactory)
{
_forwardedPorts = new List<ForwardedPort>();
}
/// <summary>
/// Called when client is disconnecting from the server.
/// </summary>
protected override void OnDisconnecting()
{
base.OnDisconnecting();
foreach (var port in _forwardedPorts)
{
port.Stop();
}
}
/// <summary>
/// Adds the forwarded port.
/// </summary>
/// <param name="port">The port.</param>
/// <exception cref="InvalidOperationException">Forwarded port is already added to a different client.</exception>
/// <exception cref="ArgumentNullException"><paramref name="port"/> is <see langword="null"/>.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public void AddForwardedPort(ForwardedPort port)
{
if (port is null)
{
throw new ArgumentNullException(nameof(port));
}
EnsureSessionIsOpen();
AttachForwardedPort(port);
_forwardedPorts.Add(port);
}
/// <summary>
/// Stops and removes the forwarded port from the list.
/// </summary>
/// <param name="port">Forwarded port.</param>
/// <exception cref="ArgumentNullException"><paramref name="port"/> is <see langword="null"/>.</exception>
public void RemoveForwardedPort(ForwardedPort port)
{
if (port is null)
{
throw new ArgumentNullException(nameof(port));
}
// Stop port forwarding before removing it
port.Stop();
DetachForwardedPort(port);
_ = _forwardedPorts.Remove(port);
}
private void AttachForwardedPort(ForwardedPort port)
{
if (port.Session != null && port.Session != Session)
{
throw new InvalidOperationException("Forwarded port is already added to a different client.");
}
port.Session = Session;
}
private static void DetachForwardedPort(ForwardedPort port)
{
port.Session = null;
}
/// <summary>
/// Creates the command to be executed.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <returns><see cref="SshCommand"/> object.</returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public SshCommand CreateCommand(string commandText)
{
return CreateCommand(commandText, ConnectionInfo.Encoding);
}
/// <summary>
/// Creates the command to be executed with specified encoding.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <param name="encoding">The encoding to use for results.</param>
/// <returns><see cref="SshCommand"/> object which uses specified encoding.</returns>
/// <remarks>This method will change current default encoding.</remarks>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="ArgumentNullException"><paramref name="commandText"/> or <paramref name="encoding"/> is <see langword="null"/>.</exception>
public SshCommand CreateCommand(string commandText, Encoding encoding)
{
EnsureSessionIsOpen();
ConnectionInfo.Encoding = encoding;
return new SshCommand(Session, commandText, encoding);
}
/// <summary>
/// Creates and executes the command.
/// </summary>
/// <param name="commandText">The command text.</param>
/// <returns>Returns an instance of <see cref="SshCommand"/> with execution results.</returns>
/// <remarks>This method internally uses asynchronous calls.</remarks>
/// <exception cref="ArgumentException">CommandText property is empty.</exception>
/// <exception cref="SshException">Invalid Operation - An existing channel was used to execute this command.</exception>
/// <exception cref="InvalidOperationException">Asynchronous operation is already in progress.</exception>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <exception cref="ArgumentNullException"><paramref name="commandText"/> is <see langword="null"/>.</exception>
public SshCommand RunCommand(string commandText)
{
var cmd = CreateCommand(commandText);
_ = cmd.Execute();
return cmd;
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <param name="terminalName">Name of the terminal.</param>
/// <param name="columns">The columns.</param>
/// <param name="rows">The rows.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="terminalModes">The terminal mode.</param>
/// <param name="bufferSize">Size of the internal read buffer.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Stream input, Stream output, Stream extendedOutput, string terminalName, uint columns, uint rows, uint width, uint height, IDictionary<TerminalModes, uint> terminalModes, int bufferSize)
{
EnsureSessionIsOpen();
return new Shell(Session, input, output, extendedOutput, terminalName, columns, rows, width, height, terminalModes, bufferSize);
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <param name="terminalName">Name of the terminal.</param>
/// <param name="columns">The columns.</param>
/// <param name="rows">The rows.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="terminalModes">The terminal mode.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Stream input, Stream output, Stream extendedOutput, string terminalName, uint columns, uint rows, uint width, uint height, IDictionary<TerminalModes, uint> terminalModes)
{
return CreateShell(input, output, extendedOutput, terminalName, columns, rows, width, height, terminalModes, 1024);
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Stream input, Stream output, Stream extendedOutput)
{
return CreateShell(input, output, extendedOutput, string.Empty, 0, 0, 0, 0, terminalModes: null, 1024);
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="encoding">The encoding to use to send the input.</param>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <param name="terminalName">Name of the terminal.</param>
/// <param name="columns">The columns.</param>
/// <param name="rows">The rows.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="terminalModes">The terminal mode.</param>
/// <param name="bufferSize">Size of the internal read buffer.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Encoding encoding, string input, Stream output, Stream extendedOutput, string terminalName, uint columns, uint rows, uint width, uint height, IDictionary<TerminalModes, uint> terminalModes, int bufferSize)
{
/*
* TODO Issue #1224: let shell dispose of input stream when we own the stream!
*/
_inputStream = new MemoryStream();
using (var writer = new StreamWriter(_inputStream, encoding, bufferSize: 1024, leaveOpen: true))
{
writer.Write(input);
writer.Flush();
}
_ = _inputStream.Seek(0, SeekOrigin.Begin);
return CreateShell(_inputStream, output, extendedOutput, terminalName, columns, rows, width, height, terminalModes, bufferSize);
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="encoding">The encoding.</param>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <param name="terminalName">Name of the terminal.</param>
/// <param name="columns">The columns.</param>
/// <param name="rows">The rows.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="terminalModes">The terminal modes.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Encoding encoding, string input, Stream output, Stream extendedOutput, string terminalName, uint columns, uint rows, uint width, uint height, IDictionary<TerminalModes, uint> terminalModes)
{
return CreateShell(encoding, input, output, extendedOutput, terminalName, columns, rows, width, height, terminalModes, 1024);
}
/// <summary>
/// Creates the shell.
/// </summary>
/// <param name="encoding">The encoding.</param>
/// <param name="input">The input.</param>
/// <param name="output">The output.</param>
/// <param name="extendedOutput">The extended output.</param>
/// <returns>
/// Returns a representation of a <see cref="Shell" /> object.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
public Shell CreateShell(Encoding encoding, string input, Stream output, Stream extendedOutput)
{
return CreateShell(encoding, input, output, extendedOutput, string.Empty, 0, 0, 0, 0, terminalModes: null, 1024);
}
/// <summary>
/// Creates the shell stream.
/// </summary>
/// <param name="terminalName">The <c>TERM</c> environment variable.</param>
/// <param name="columns">The terminal width in columns.</param>
/// <param name="rows">The terminal width in rows.</param>
/// <param name="width">The terminal width in pixels.</param>
/// <param name="height">The terminal height in pixels.</param>
/// <param name="bufferSize">The size of the buffer.</param>
/// <returns>
/// The created <see cref="ShellStream"/> instance.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <remarks>
/// <para>
/// The <c>TERM</c> environment variable contains an identifier for the text window's capabilities.
/// You can get a detailed list of these capabilities by using the ‘infocmp’ command.
/// </para>
/// <para>
/// The column/row dimensions override the pixel dimensions(when nonzero). Pixel dimensions refer
/// to the drawable area of the window.
/// </para>
/// </remarks>
public ShellStream CreateShellStream(string terminalName, uint columns, uint rows, uint width, uint height, int bufferSize)
{
return CreateShellStream(terminalName, columns, rows, width, height, bufferSize, bufferSize * 2, terminalModeValues: null);
}
/// <summary>
/// Creates the shell stream.
/// </summary>
/// <param name="terminalName">The <c>TERM</c> environment variable.</param>
/// <param name="columns">The terminal width in columns.</param>
/// <param name="rows">The terminal width in rows.</param>
/// <param name="width">The terminal width in pixels.</param>
/// <param name="height">The terminal height in pixels.</param>
/// <param name="bufferSize">The size of the buffer.</param>
/// <param name="expectSize">The size of the expect buffer.</param>
/// <returns>
/// The created <see cref="ShellStream"/> instance.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <remarks>
/// <para>
/// The <c>TERM</c> environment variable contains an identifier for the text window's capabilities.
/// You can get a detailed list of these capabilities by using the ‘infocmp’ command.
/// </para>
/// <para>
/// The column/row dimensions override the pixel dimensions(when non-zero). Pixel dimensions refer
/// to the drawable area of the window.
/// </para>
/// </remarks>
public ShellStream CreateShellStream(string terminalName, uint columns, uint rows, uint width, uint height, int bufferSize, int expectSize)
{
EnsureSessionIsOpen();
return CreateShellStream(terminalName, columns, rows, width, height, bufferSize, expectSize, terminalModeValues: null);
}
/// <summary>
/// Creates the shell stream.
/// </summary>
/// <param name="terminalName">The <c>TERM</c> environment variable.</param>
/// <param name="columns">The terminal width in columns.</param>
/// <param name="rows">The terminal width in rows.</param>
/// <param name="width">The terminal width in pixels.</param>
/// <param name="height">The terminal height in pixels.</param>
/// <param name="bufferSize">The size of the buffer.</param>
/// <param name="terminalModeValues">The terminal mode values.</param>
/// <returns>
/// The created <see cref="ShellStream"/> instance.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <remarks>
/// <para>
/// The <c>TERM</c> environment variable contains an identifier for the text window's capabilities.
/// You can get a detailed list of these capabilities by using the ‘infocmp’ command.
/// </para>
/// <para>
/// The column/row dimensions override the pixel dimensions(when non-zero). Pixel dimensions refer
/// to the drawable area of the window.
/// </para>
/// </remarks>
public ShellStream CreateShellStream(string terminalName, uint columns, uint rows, uint width, uint height, int bufferSize, IDictionary<TerminalModes, uint> terminalModeValues)
{
EnsureSessionIsOpen();
return CreateShellStream(terminalName, columns, rows, width, height, bufferSize, bufferSize * 2, terminalModeValues);
}
/// <summary>
/// Creates the shell stream.
/// </summary>
/// <param name="terminalName">The <c>TERM</c> environment variable.</param>
/// <param name="columns">The terminal width in columns.</param>
/// <param name="rows">The terminal width in rows.</param>
/// <param name="width">The terminal width in pixels.</param>
/// <param name="height">The terminal height in pixels.</param>
/// <param name="bufferSize">The size of the buffer.</param>
/// <param name="expectSize">The size of the expect buffer.</param>
/// <param name="terminalModeValues">The terminal mode values.</param>
/// <returns>
/// The created <see cref="ShellStream"/> instance.
/// </returns>
/// <exception cref="SshConnectionException">Client is not connected.</exception>
/// <remarks>
/// <para>
/// The <c>TERM</c> environment variable contains an identifier for the text window's capabilities.
/// You can get a detailed list of these capabilities by using the ‘infocmp’ command.
/// </para>
/// <para>
/// The column/row dimensions override the pixel dimensions(when non-zero). Pixel dimensions refer
/// to the drawable area of the window.
/// </para>
/// </remarks>
public ShellStream CreateShellStream(string terminalName, uint columns, uint rows, uint width, uint height, int bufferSize, int expectSize, IDictionary<TerminalModes, uint> terminalModeValues)
{
EnsureSessionIsOpen();
return ServiceFactory.CreateShellStream(Session, terminalName, columns, rows, width, height, terminalModeValues, bufferSize, expectSize);
}
/// <summary>
/// Stops forwarded ports.
/// </summary>
protected override void OnDisconnected()
{
base.OnDisconnected();
for (var i = _forwardedPorts.Count - 1; i >= 0; i--)
{
var port = _forwardedPorts[i];
DetachForwardedPort(port);
_forwardedPorts.RemoveAt(i);
}
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="disposing"><see langword="true"/> to release both managed and unmanaged resources; <see langword="false"/> to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (_isDisposed)
{
return;
}
if (disposing)
{
if (_inputStream != null)
{
_inputStream.Dispose();
_inputStream = null;
}
_isDisposed = true;
}
}
private void EnsureSessionIsOpen()
{
if (Session is null)
{
throw new SshConnectionException("Client not connected.");
}
}
}
}