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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using Renci.SshNet.Common;
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using Renci.SshNet.Messages.Transport;
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using Renci.SshNet.Security;
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using Renci.SshNet.Sftp;
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using Renci.SshNet.Abstractions;
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namespace Renci.SshNet
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{
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/// <summary>
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/// Basic factory for creating new services.
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/// </summary>
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internal partial class ServiceFactory : IServiceFactory
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{
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/// <summary>
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/// Creates a <see cref="IClientAuthentication"/>.
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/// </summary>
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/// <returns>
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/// A <see cref="IClientAuthentication"/>.
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/// </returns>
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public IClientAuthentication CreateClientAuthentication()
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{
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return new ClientAuthentication();
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}
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/// <summary>
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/// Creates a new <see cref="ISession"/> with the specified <see cref="ConnectionInfo"/>.
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/// </summary>
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/// <param name="connectionInfo">The <see cref="ConnectionInfo"/> to use for creating a new session.</param>
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/// <returns>
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/// An <see cref="ISession"/> for the specified <see cref="ConnectionInfo"/>.
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/// </returns>
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/// <exception cref="ArgumentNullException"><paramref name="connectionInfo"/> is <c>null</c>.</exception>
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public ISession CreateSession(ConnectionInfo connectionInfo)
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{
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return new Session(connectionInfo, this);
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}
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/// <summary>
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/// Creates a new <see cref="ISftpSession"/> in a given <see cref="ISession"/> and with
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/// the specified operation timeout and encoding.
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/// </summary>
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/// <param name="session">The <see cref="ISession"/> to create the <see cref="ISftpSession"/> in.</param>
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/// <param name="operationTimeout">The number of milliseconds to wait for an operation to complete, or -1 to wait indefinitely.</param>
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/// <param name="encoding">The encoding.</param>
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/// <returns>
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/// An <see cref="ISftpSession"/>.
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/// </returns>
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public ISftpSession CreateSftpSession(ISession session, int operationTimeout, Encoding encoding)
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{
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return new SftpSession(session, operationTimeout, encoding);
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}
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/// <summary>
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/// Create a new <see cref="PipeStream"/>.
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/// </summary>
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/// <returns>
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/// A <see cref="PipeStream"/>.
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/// </returns>
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public PipeStream CreatePipeStream()
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{
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return new PipeStream();
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}
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/// <summary>
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/// Negotiates a key exchange algorithm, and creates a <see cref="IKeyExchange" /> for the negotiated
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/// algorithm.
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/// </summary>
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/// <param name="clientAlgorithms">A <see cref="IDictionary{String, Type}"/> of the key exchange algorithms supported by the client where key is the name of the algorithm, and value is the type implementing this algorithm.</param>
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/// <param name="serverAlgorithms">The names of the key exchange algorithms supported by the SSH server.</param>
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/// <returns>
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/// A <see cref="IKeyExchange"/> that was negotiated between client and server.
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/// </returns>
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/// <exception cref="ArgumentNullException"><paramref name="clientAlgorithms"/> is <c>null</c>.</exception>
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/// <exception cref="ArgumentNullException"><paramref name="serverAlgorithms"/> is <c>null</c>.</exception>
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/// <exception cref="SshConnectionException">No key exchange algorithms are supported by both client and server.</exception>
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public IKeyExchange CreateKeyExchange(IDictionary<string, Type> clientAlgorithms, string[] serverAlgorithms)
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{
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if (clientAlgorithms == null)
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throw new ArgumentNullException("clientAlgorithms");
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if (serverAlgorithms == null)
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throw new ArgumentNullException("serverAlgorithms");
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// find an algorithm that is supported by both client and server
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var keyExchangeAlgorithmType = (from c in clientAlgorithms
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from s in serverAlgorithms
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where s == c.Key
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select c.Value).FirstOrDefault();
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if (keyExchangeAlgorithmType == null)
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{
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throw new SshConnectionException("Failed to negotiate key exchange algorithm.", DisconnectReason.KeyExchangeFailed);
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}
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return keyExchangeAlgorithmType.CreateInstance<IKeyExchange>();
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}
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public ISftpFileReader CreateSftpFileReader(string fileName, ISftpSession sftpSession, uint bufferSize)
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{
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const int DefaultMaxPendingReads = 3;
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var openAsyncResult = sftpSession.BeginOpen(fileName, Flags.Read, null, null);
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var statAsyncResult = sftpSession.BeginLStat(fileName, null, null);
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long? fileSize;
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int maxPendingReads;
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var chunkSize = sftpSession.CalculateOptimalReadLength(bufferSize);
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// fallback to a default maximum of pending reads when remote server does not allow us to obtain
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// the attributes of the file
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try
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{
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var fileAttributes = sftpSession.EndLStat(statAsyncResult);
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fileSize = fileAttributes.Size;
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maxPendingReads = Math.Min(10, (int) Math.Ceiling((double) fileAttributes.Size / chunkSize) + 1);
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}
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catch (SshException ex)
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{
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fileSize = null;
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maxPendingReads = DefaultMaxPendingReads;
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DiagnosticAbstraction.Log(string.Format("Failed to obtain size of file. Allowing maximum {0} pending reads: {1}", maxPendingReads, ex));
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}
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var handle = sftpSession.EndOpen(openAsyncResult);
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return sftpSession.CreateFileReader(handle, sftpSession, chunkSize, maxPendingReads, fileSize);
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}
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}
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}
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