//******************************************************************************************************//  TFtpClient.cs - Gbtc////  Copyright © 2020, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this//  file except in compliance with the License. You may obtain a copy of the License at:////      http://opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  05/12/2020 - J. Ritchie Carroll//       Generated original version of source code.////****************************************************************************************************** #region [ Contributor License Agreements ] //*******************************************************************************************************////   Code based on the following project://        https://github.com/Callisto82/tftp.net//  //   Copyright © 2011, Michael Baer////******************************************************************************************************* #endregion using System;using System.Linq;using System.Net;using System.Net.Sockets;using GSF.Net.TFtp.Channel;using GSF.Net.TFtp.Transfer; // ReSharper disable InconsistentNamingnamespace GSF.Net.TFtp{    /// <summary>    /// A TFTP client that can connect to a TFTP server.    /// </summary>    public class TFtpClient    {        private const int DefaultServerPort = 69;        private readonly IPEndPoint m_remoteAddress;         /// <summary>        /// Default constructor.        /// </summary>        /// <param name="remoteAddress">Address of the server that you would like to connect to.</param>        public TFtpClient(IPEndPoint remoteAddress)        {            m_remoteAddress = remoteAddress;        }         /// <summary>        /// Connects to a server        /// </summary>        /// <param name="ip">Address of the server that you want connect to.</param>        /// <param name="port">Port on the server that you want connect to (default: 69)</param>        public TFtpClient(IPAddress ip, int port)            : this(new IPEndPoint(ip, port))         {         }         /// <summary>        /// Connects to a server on port 69.        /// </summary>        /// <param name="ip">Address of the server that you want connect to.</param>        public TFtpClient(IPAddress ip)            : this(new IPEndPoint(ip, DefaultServerPort))        {        }         /// <summary>        /// Connect to a server by hostname.        /// </summary>        /// <param name="host">Hostname or IP to connect to</param>        public TFtpClient(string host)            : this(host, DefaultServerPort)        {        }         /// <summary>        /// Connect to a server by hostname and port .        /// </summary>        /// <param name="host">Hostname or IP to connect to</param>        /// <param name="port">Port to connect to</param>        public TFtpClient(string host, int port)        {            IPAddress ip = Dns.GetHostAddresses(host).FirstOrDefault(x => x.AddressFamily == AddressFamily.InterNetwork);             if (ip == null)                throw new ArgumentException($"Could not convert '{host}' to an IPv4 address.", nameof(host));             m_remoteAddress = new IPEndPoint(ip, port);        }         /// <summary>        /// GET a file from the server.        /// You have to call Start() on the returned ITFtpTransfer to start the transfer.        /// </summary>        public ITFtpTransfer Download(string filename)        {            ITransferChannel channel = TransferChannelFactory.CreateConnection(m_remoteAddress);            return new RemoteReadTransfer(channel, filename);        }         /// <summary>        /// PUT a file from the server.        /// You have to call Start() on the returned ITFtpTransfer to start the transfer.        /// </summary>        public ITFtpTransfer Upload(string filename)        {            ITransferChannel channel = TransferChannelFactory.CreateConnection(m_remoteAddress);            return new RemoteWriteTransfer(channel, filename);        }    }}