420 lines
14 KiB
C#
420 lines
14 KiB
C#
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#region COPYRIGHT (c) 2007 by Matthias Fischer
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// This material may not be duplicated in whole or in part, except for
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// personal use, without the express written consent of the author.
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//
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// Autor: Matthais Fischer
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// Email: mfischer@comzept.de
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//
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// Copyright (C) 2007 Matthias Fischer. All Rights Reserved.
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#endregion
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using System;
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using System.IO;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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namespace Comzept.Genesis.NetworkTools
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{
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/// <summary>
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/// Implementation of Basic TFTP Client Functions
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/// </summary>
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public class TFTPClient
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{
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#region -=[ Declarations ]=-
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/// <summary>
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/// TFTP opcodes
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/// </summary>
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public enum Opcodes
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{
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Unknown = 0,
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Read = 1,
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Write = 2,
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Data = 3,
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Ack = 4,
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Error = 5
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}
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/// <summary>
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/// TFTP modes
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/// </summary>
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public enum Modes
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{
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Unknown = 0,
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NetAscii = 1,
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Octet = 2,
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Mail = 3
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}
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/// <summary>
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/// <20><><EFBFBD>洫<EFBFBD><E6B4AB><EFBFBD><EFBFBD><EFBFBD>ɽ<EFBFBD><C9BD><EFBFBD><EFBFBD>¼<EFBFBD>ί<EFBFBD><CEAF>
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/// </summary>
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/// <param name="completedBlock"><3E><><EFBFBD><EFBFBD><EFBFBD>ɴ<EFBFBD><C9B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></param>
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/// <param name="totalBlock"><3E>ܿ<EFBFBD><DCBF><EFBFBD></param>
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public delegate void ReportCompletedProgressEventDelegate(string remoteIP, int completedBlock, int totalBlock);
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/// <summary>
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/// A TFTP Exception
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/// </summary>
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public class TFTPException : Exception
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{
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public string ErrorMessage = "";
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public int ErrorCode = -1;
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/// <summary>
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/// Initializes a new instance of the <see cref="TFTPException"/> class.
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/// </summary>
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/// <param name="errCode">The err code.</param>
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/// <param name="errMsg">The err MSG.</param>
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public TFTPException(int errCode, string errMsg)
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{
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ErrorCode = errCode;
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ErrorMessage = errMsg;
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}
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/// <summary>
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/// Creates and returns a string representation of the current exception.
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/// </summary>
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/// <returns>
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/// A string representation of the current exception.
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/// </returns>
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/// <filterPriority>1</filterPriority>
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/// <permissionSet class="System.Security.permissionSet" version="1">
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/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" PathDiscovery="*AllFiles*"/>
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/// </permissionSet>
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public override string ToString()
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{
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return String.Format("TFTPException: ErrorCode: {0} Message: {1}", ErrorCode, ErrorMessage);
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}
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}
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private int tftpPort;
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private string tftpServer = "";
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private int blockSize = 512;
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#endregion
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#region -=[ Ctor ]=-
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/// <summary>
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/// Initializes a new instance of the <see cref="TFTPClient"/> class.
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/// </summary>
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/// <param name="server">The server.</param>
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public TFTPClient(string server)
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: this(server, 69)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="TFTPClient"/> class.
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/// </summary>
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/// <param name="server">The server.</param>
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/// <param name="port">The port.</param>
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public TFTPClient(string server, int port)
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{
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Server = server;
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Port = port;
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}
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#endregion
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#region -=[ Public Properties ]=-
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/// <summary>
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/// Gets the port.
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/// </summary>
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/// <value>The port.</value>
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public int Port
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{
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get { return tftpPort; }
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private set { tftpPort = value; }
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}
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/// <summary>
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/// Gets the server.
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/// </summary>
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/// <value>The server.</value>
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public string Server
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{
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get { return tftpServer; }
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private set { tftpServer = value; }
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}
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/// <summary>
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/// <20><><EFBFBD><EFBFBD>С
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/// </summary>
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public int BlockSize
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{
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get { return this.blockSize; }
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private set { this.blockSize = value; }
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}
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#endregion
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#region -=[ Events ]=-
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public event ReportCompletedProgressEventDelegate ReportCompletedProgress;
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#endregion
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#region -=[ Public Member ]=-
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/// <summary>
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/// Gets the specified remote file.
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/// </summary>
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/// <param name="remoteFile">The remote file.</param>
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/// <param name="localFile">The local file.</param>
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public void Get(string remoteFile, string localFile)
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{
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Get(remoteFile, localFile, Modes.Octet);
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}
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/// <summary>
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/// Gets the specified remote file.
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/// </summary>
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/// <param name="remoteFile">The remote file.</param>
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/// <param name="localFile">The local file.</param>
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/// <param name="tftpMode">The TFTP mode.</param>
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public void Get(string remoteFile, string localFile, Modes tftpMode)
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{
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int len = 0;
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int packetNr = 1;
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byte[] sndBuffer = CreateRequestPacket(Opcodes.Read, remoteFile, tftpMode);
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byte[] rcvBuffer = new byte[516];
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BinaryWriter fileStream = new BinaryWriter(new FileStream(localFile, FileMode.Create, FileAccess.Write, FileShare.Read));
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//IPHostEntry hostEntry = Dns.GetHostEntry(tftpServer);
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//IPEndPoint serverEP = new IPEndPoint(hostEntry.AddressList[0], tftpPort);
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IPEndPoint serverEP = new IPEndPoint(IPAddress.Parse(tftpServer), tftpPort);
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EndPoint dataEP = (EndPoint)serverEP;
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Socket tftpSocket = new Socket(serverEP.Address.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
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// Request and Receive first Data Packet From TFTP Server
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tftpSocket.SendTo(sndBuffer, sndBuffer.Length, SocketFlags.None, serverEP);
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tftpSocket.ReceiveTimeout = 10000;
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len = tftpSocket.ReceiveFrom(rcvBuffer, ref dataEP);
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// keep track of the TID
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serverEP.Port = ((IPEndPoint)dataEP).Port;
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while (true)
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{
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// handle any kind of error
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if (((Opcodes)rcvBuffer[1]) == Opcodes.Error)
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{
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fileStream.Close();
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tftpSocket.Close();
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throw new TFTPException(((rcvBuffer[2] << 8) & 0xff00) | rcvBuffer[3], Encoding.ASCII.GetString(rcvBuffer, 4, rcvBuffer.Length - 5).Trim('\0'));
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}
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// expect the next packet
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if ((((rcvBuffer[2] << 8) & 0xff00) | rcvBuffer[3]) == packetNr)
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{
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// Store to local file
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fileStream.Write(rcvBuffer, 4, len - 4);
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// Send Ack Packet to TFTP Server
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sndBuffer = CreateAckPacket(packetNr++);
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tftpSocket.SendTo(sndBuffer, sndBuffer.Length, SocketFlags.None, serverEP);
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}
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// Was ist the last packet ?
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if (len < 516)
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{
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break;
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}
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else
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{
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// Receive Next Data Packet From TFTP Server
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len = tftpSocket.ReceiveFrom(rcvBuffer, ref dataEP);
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}
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}
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// Close Socket and release resources
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tftpSocket.Close();
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fileStream.Close();
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}
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/// <summary>
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/// Puts the specified remote file.
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/// </summary>
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/// <param name="remoteFile">The remote file.</param>
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/// <param name="localFile">The local file.</param>
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public void Put(string remoteFile, string localFile)
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{
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Put(remoteFile, localFile, Modes.Octet);
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}
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/// <summary>
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/// Puts the specified remote file.
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/// </summary>
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/// <param name="remoteFile">The remote file.</param>
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/// <param name="localFile">The local file.</param>
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/// <param name="tftpMode">The TFTP mode.</param>
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/// <remarks>What if the ack does not come !</remarks>
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public void Put(string remoteFile, string localFile, Modes tftpMode)
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{
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int len = 0;
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byte[] sndBuffer = CreateRequestPacket(Opcodes.Write, remoteFile, tftpMode);
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byte[] rcvBuffer = new byte[516];
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BinaryReader fileStreamReader = new BinaryReader(new FileStream(localFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
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//IPHostEntry hostEntry = Dns.GetHostEntry(tftpServer);
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//IPEndPoint serverEP = new IPEndPoint(hostEntry.AddressList[0], tftpPort);
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IPEndPoint serverEP = new IPEndPoint(IPAddress.Parse(tftpServer), tftpPort);
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EndPoint dataEP = (EndPoint)serverEP;
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Socket tftpSocket = new Socket(serverEP.Address.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
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// Request Writing to TFTP Server
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tftpSocket.SendTo(sndBuffer, sndBuffer.Length, SocketFlags.None, serverEP);
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len = tftpSocket.ReceiveFrom(rcvBuffer, ref dataEP);
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tftpSocket.ReceiveTimeout = 5000;
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// keep track of the TID
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serverEP.Port = ((IPEndPoint)dataEP).Port;
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int tryCount = 5;
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int packetTl = (int)Math.Ceiling((double)fileStreamReader.BaseStream.Length / this.blockSize);
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for (int packetNr = 1; packetNr <= packetTl; packetNr++)
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{
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// handle any kind of error
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if (((Opcodes)rcvBuffer[1]) == Opcodes.Error)
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{
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fileStreamReader.Close();
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tftpSocket.Close();
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throw new TFTPException(((rcvBuffer[2] << 8) & 0xff00) | rcvBuffer[3], Encoding.ASCII.GetString(rcvBuffer, 4, rcvBuffer.Length - 5).Trim('\0'));
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}
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// expect the next packet ack
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if ((((Opcodes)rcvBuffer[1]) == Opcodes.Ack) &&
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(((rcvBuffer[2] << 8) & 0xff00) | rcvBuffer[3]) == (packetNr - 1))
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{
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fileStreamReader.BaseStream.Seek((packetNr - 1) * blockSize, SeekOrigin.Begin);
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sndBuffer = CreateDataPacket(packetNr, fileStreamReader.ReadBytes(512));
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tftpSocket.SendTo(sndBuffer, sndBuffer.Length, SocketFlags.None, serverEP);
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}
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if (ReportCompletedProgress != null)
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{
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ReportCompletedProgress.Invoke(serverEP.Address.ToString(), packetNr, packetTl);
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}
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try
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{
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len = tftpSocket.ReceiveFrom(rcvBuffer, ref dataEP);
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tryCount = 5;
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}
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catch (SocketException ex)
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{
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if (ex.SocketErrorCode == SocketError.TimedOut && tryCount >= 0)
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{
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tryCount--;
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packetNr = (packetNr <= 0 ? 0 : --packetNr);
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}
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else
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{
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throw ex;
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}
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}
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}
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// Close Socket and release resources
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tftpSocket.Close();
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fileStreamReader.Close();
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}
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#endregion
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#region -=[ Private Member ]=-
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/// <summary>
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/// Creates the request packet.
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/// </summary>
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/// <param name="opCode">The op code.</param>
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/// <param name="remoteFile">The remote file.</param>
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/// <param name="tftpMode">The TFTP mode.</param>
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/// <returns>the ack packet</returns>
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private byte[] CreateRequestPacket(Opcodes opCode, string remoteFile, Modes tftpMode)
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{
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// Create new Byte array to hold Initial
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// Read Request Packet
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int pos = 0;
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string modeAscii = tftpMode.ToString().ToLowerInvariant();
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byte[] ret = new byte[modeAscii.Length + remoteFile.Length + 4];
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// Set first Opcode of packet to indicate
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// if this is a read request or write request
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ret[pos++] = 0;
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|
|
ret[pos++] = (byte)opCode;
|
|||
|
|
|
|||
|
|
// Convert Filename to a char array
|
|||
|
|
pos += Encoding.ASCII.GetBytes(remoteFile, 0, remoteFile.Length, ret, pos);
|
|||
|
|
ret[pos++] = 0;
|
|||
|
|
pos += Encoding.ASCII.GetBytes(modeAscii, 0, modeAscii.Length, ret, pos);
|
|||
|
|
ret[pos] = 0;
|
|||
|
|
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Creates the data packet.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="packetNr">The packet nr.</param>
|
|||
|
|
/// <param name="data">The data.</param>
|
|||
|
|
/// <returns>the data packet</returns>
|
|||
|
|
private byte[] CreateDataPacket(int blockNr, byte[] data)
|
|||
|
|
{
|
|||
|
|
// Create Byte array to hold ack packet
|
|||
|
|
byte[] ret = new byte[4 + data.Length];
|
|||
|
|
|
|||
|
|
// Set first Opcode of packet to TFTP_ACK
|
|||
|
|
ret[0] = 0;
|
|||
|
|
ret[1] = (byte)Opcodes.Data;
|
|||
|
|
ret[2] = (byte)((blockNr >> 8) & 0xff);
|
|||
|
|
ret[3] = (byte)(blockNr & 0xff);
|
|||
|
|
Array.Copy(data, 0, ret, 4, data.Length);
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// <summary>
|
|||
|
|
/// Creates the ack packet.
|
|||
|
|
/// </summary>
|
|||
|
|
/// <param name="blockNr">The block nr.</param>
|
|||
|
|
/// <returns>the ack packet</returns>
|
|||
|
|
private byte[] CreateAckPacket(int blockNr)
|
|||
|
|
{
|
|||
|
|
// Create Byte array to hold ack packet
|
|||
|
|
byte[] ret = new byte[4];
|
|||
|
|
|
|||
|
|
// Set first Opcode of packet to TFTP_ACK
|
|||
|
|
ret[0] = 0;
|
|||
|
|
ret[1] = (byte)Opcodes.Ack;
|
|||
|
|
|
|||
|
|
// Insert block number into packet array
|
|||
|
|
ret[2] = (byte)((blockNr >> 8) & 0xff);
|
|||
|
|
ret[3] = (byte)(blockNr & 0xff);
|
|||
|
|
return ret;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#endregion
|
|||
|
|
}
|
|||
|
|
}
|