C#实现TFTP客户端

本文主要是介绍C#实现TFTP客户端，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、文件结构

2、TftpConfig.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace TftpTest
{public class TftpConfig{}/// <summary>/// 模式/// </summary>public enum Modes{NETASCII = 0,   //ASCIIOCTET = 1       //二进制}/// <summary>/// 操作码/// </summary>public enum OpCodes{RRQ = 1,    // 读请求WRQ = 2,    // 写请求DATA = 3,   // 数据ACK = 4,    // AcknowledgeERROR = 5,  // 错误OACK = 6    // Option Acknowledge}public enum TransferType{Get,Put}public struct TransferOptions{private TransferType _action;public TransferType Action{get { return _action; }set { _action = value; }}private string _localFilename;public string LocalFilename{get { return _localFilename; }set { _localFilename = value; }}private string _remoteFilename;public string RemoteFilename{get { return _remoteFilename; }set { _remoteFilename = value; }}private string _host;public string Host{get { return _host; }set { _host = value; }}}
}

3、ErrorPacket.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace TftpTest
{public class ErrorPacket{short _code;public short Code{get { return _code; }set { _code = value; }}string _message;public string Message{get { return _message; }set { _message = value; }}public ErrorPacket(short Code, string Message){Code = _code;Message = _message;}}
}

4、PacketBuilder.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace TftpTest
{public class PacketBuilder{public byte[] Request(OpCodes OpCode, string RemoteFileName,Modes Mode, int BlockSize, long TransferSize, int Timeout){// Request packet structure// -----------------------------------------------------------------------------// |OpCode|FileName|0|Mode|0|BlkSize|0|BSVal|0|TSize|0|TSVal|0|Timeout|0|TVal|0|// -----------------------------------------------------------------------------int len;string packetStr = "";string mode = Mode.ToString().ToLower();string blockSize = BlockSize.ToString();string nullChar = "\0";byte[] packet;// Create packet as a stringswitch (OpCode){case OpCodes.RRQ:packetStr = nullChar + (char)1;break;case OpCodes.WRQ:packetStr = nullChar + (char)2;break;}packetStr += RemoteFileName + nullChar + mode + nullChar + "blksize" +nullChar + BlockSize.ToString() + nullChar + "tsize" + nullChar +TransferSize.ToString() + nullChar + "timeout" + nullChar +Timeout.ToString() + nullChar;len = packetStr.Length;packet = new byte[len];// Encode packet as ASCII bytespacket = System.Text.Encoding.ASCII.GetBytes(packetStr);return packet;}public byte[] Ack(int Block1, int Block2){// ACK packet structure// ----------// |04|Block|// ----------byte[] packet = new byte[4];packet[0] = 0;packet[1] = (byte)OpCodes.ACK;packet[2] = (byte)Block1;packet[3] = (byte)Block2;return packet;}public byte[] Data(byte[] SendData, int Block1, int Block2){// DATA packet structure// ----------// |03|Block|// ----------byte[] packet = new byte[SendData.Length + 4];//packet[0] = 0;packet[1] = (byte)OpCodes.DATA;packet[2] = (byte)Block1;packet[3] = (byte)Block2;for (int h = 4; h < SendData.Length + 4; h++){packet[h] = SendData[h - 4];}return packet;}public int[] IncrementBock(byte[] ReceivedData, int[] Block){if (ReceivedData[3] == 255){if (ReceivedData[2] < 255){Block[0] = (int)ReceivedData[2] + 1; Block[1] = 0;}else{Block[0] = 0; Block[1] = 0;}}else{Block[1] = (int)ReceivedData[3] + 1;}return Block;}}
}

5、PacketReader.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace TftpTest
{public class PacketReader{public OpCodes ReadOpCode(byte[] ReceivedData){return (OpCodes)ReceivedData[1];}public int ReadTransferSize(byte[] ReceivedData){int h, tSize = 0;string searchStr, decPacket = Encoding.ASCII.GetString(ReceivedData);char[] splitChar = { '\0' };string[] splitPacket = decPacket.Split(splitChar);for (h = 0; h < splitPacket.Length - 1; h++){searchStr = splitPacket[h].ToLower();if (searchStr == "tsize"){tSize = int.Parse(splitPacket[h + 1]);}}return tSize;}public ErrorPacket ReadError(byte[] ReceivedData){string codeStr = ReceivedData[2].ToString() + ReceivedData[3].ToString();short code = short.Parse(codeStr);string message = "";for (int h = 4; h < ReceivedData.Length; h++){if (ReceivedData[h] == 0)break;message += (char)ReceivedData[h];}return new ErrorPacket(code, message);}public bool CompareBlocks(byte[] SentData, byte[] ReceivedData){if (ReceivedData[2] == SentData[2] &&ReceivedData[3] == SentData[3])return true;return false;}}
}

6、TftpClient.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.Threading.Tasks;namespace TftpTest
{public class TftpClient{// 委托public delegate void ConnectedHandler();public delegate void TransferringHandler(long BytesTransferred, long BytesTotal);public delegate void TransferFailedHandler(short ErrorCode, string ErrorMessage);public delegate void TransferFinishedHandler();public delegate void DisconnectedHandler();// 事件public event ConnectedHandler Connected;public event TransferringHandler Transferring;public event TransferFailedHandler TransferFailed;public event TransferFinishedHandler TransferFinished;public event DisconnectedHandler Disconnected;private string _host;[Description("主机")]public string Host{get { return _host; }set { _host = value; }}private Modes _mode = Modes.OCTET;[Description("模式")]public Modes Mode{get { return _mode; }set { _mode = value; }}private int _blockSIze = 512;[Description("块大小")]public int BlockSize{get { return _blockSIze; }set { _blockSIze = value; }}private int _timeout = 10;[Description("溢出时间")]public int Timeout{get { return _timeout; }set { _timeout = value; }}PacketReader _packetReader = new PacketReader();PacketBuilder _packetBuilder = new PacketBuilder();public bool Get(string localFile, string RemoteFile, string Host){return Get(localFile, RemoteFile, Host, Mode, BlockSize, Timeout);}public bool Put(string localFile, string RemoteFile, string Host){return Put(localFile, RemoteFile, Host, Mode, BlockSize, Timeout);}public bool Get(string LocalFile, string RemoteFile, string Host,Modes Mode, int BlockSize, int Timeout){int recvLen, remoteFileSize = 0, buffer = BlockSize + 4;long bytesReceived = 0;BinaryWriter BWriter = new BinaryWriter(File.Open(LocalFile, FileMode.Create));OpCodes opCode = new OpCodes();IPHostEntry hInfo = Dns.GetHostEntry(Host);IPAddress address = hInfo.AddressList[0];IPEndPoint remoteEP = new IPEndPoint(address, 69);EndPoint localEP = (remoteEP);Socket UDPSock = new Socket(remoteEP.AddressFamily, SocketType.Dgram, ProtocolType.Udp);// Create initial request and buffer for responsebyte[] sendData = _packetBuilder.Request(OpCodes.RRQ,RemoteFile, Mode, BlockSize, 0, Timeout);byte[] recvData = new byte[BlockSize + 4];UDPSock.ReceiveTimeout = Timeout * 1000;// Send request and wait for responseUDPSock.SendTo(sendData, remoteEP);recvLen = UDPSock.ReceiveFrom(recvData, ref localEP);// Get TIDremoteEP.Port = ((IPEndPoint)localEP).Port;// Invoke connected eventConnected.Invoke();while (true){// Read opcodeopCode = _packetReader.ReadOpCode(recvData);// DATA packetif (opCode == OpCodes.DATA){bytesReceived += recvLen - 4;// Invoke Transferring EventTransferring.Invoke(bytesReceived, remoteFileSize);for (int h = 4; h < recvLen; h++){BWriter.Write(recvData[h]);}sendData = _packetBuilder.Ack(recvData[2], recvData[3]);// Check if this packet is the lastif (recvLen < buffer){// Send final ACKUDPSock.SendTo(sendData, remoteEP);// Invoked TransferFinished EventTransferFinished.Invoke();break;}}// OACK packetelse if (opCode == OpCodes.OACK){remoteFileSize = _packetReader.ReadTransferSize(recvData);sendData = _packetBuilder.Ack(0, 0);}// ERROR packetelse if (opCode == OpCodes.ERROR){ErrorPacket transferError = _packetReader.ReadError(recvData);TransferFailed.Invoke(transferError.Code, transferError.Message);break;}// Send next packetUDPSock.SendTo(sendData, remoteEP);recvLen = UDPSock.ReceiveFrom(recvData, ref localEP);remoteEP.Port = ((IPEndPoint)localEP).Port;}BWriter.Close();UDPSock.Close();// Invoke Disconnected EventDisconnected.Invoke();return true;}public bool Put(string LocalFile, string RemoteFile, string Host,Modes Mode, int BlockSize, int Timeout){int[] block = new int[2];int bufferSize = BlockSize;long fileSize, bytesSent = 0;BinaryReader BReader = new BinaryReader(File.Open(LocalFile, FileMode.Open));FileInfo sendFile = new FileInfo(LocalFile);OpCodes opCode = new OpCodes();IPHostEntry hostInfo = Dns.GetHostEntry(Host);IPAddress address = hostInfo.AddressList[0];IPEndPoint remoteEP = new IPEndPoint(address, 69);EndPoint localEP = (remoteEP);Socket UDPSock = new Socket(remoteEP.AddressFamily, SocketType.Dgram, ProtocolType.Udp);// Retrieve filesize for tsize optionfileSize = sendFile.Length;// Create initial request and buffer for responsebyte[] sendData = _packetBuilder.Request(OpCodes.WRQ,RemoteFile, Mode, BlockSize, fileSize, Timeout);byte[] recvData = new byte[bufferSize];UDPSock.ReceiveTimeout = Timeout * 1000;// Send request and wait for responseUDPSock.SendTo(sendData, remoteEP);UDPSock.ReceiveFrom(recvData, ref localEP);//Get TIDremoteEP.Port = ((IPEndPoint)localEP).Port;// Invoke Connected EventConnected.Invoke();while (true){// Read opcodeopCode = _packetReader.ReadOpCode(recvData);// ACK packetif (opCode == OpCodes.ACK){block = _packetBuilder.IncrementBock(recvData, block);sendData = BReader.ReadBytes(bufferSize);bytesSent += sendData.Length;// Invoke Transferring EventTransferring.Invoke(bytesSent, fileSize);sendData = _packetBuilder.Data(sendData, block[0], block[1]);// Check if this packet is the lastif (sendData.Length < bufferSize + 4){// Send final data packet and wait for ackwhile (true){UDPSock.SendTo(sendData, remoteEP);UDPSock.ReceiveFrom(recvData, ref localEP);remoteEP.Port = ((IPEndPoint)localEP).Port;// Check the blocks and break free if equalif (_packetReader.CompareBlocks(sendData, recvData))break;}// Invoke TransferFinished EventTransferFinished.Invoke();break;}}// OACK packetelse if (opCode == OpCodes.OACK){sendData = BReader.ReadBytes(bufferSize);sendData = _packetBuilder.Data(sendData, 0, 1);bytesSent += sendData.Length - 4;// Invoke Transferring EventTransferring.Invoke(bytesSent, fileSize);if (fileSize == 0){// Invoke TransferFinished EventTransferFinished.Invoke();break;}else{// Check if this packet is the lastif (sendData.Length < bufferSize + 4){// Send final data packet and wait for ackwhile (true){UDPSock.SendTo(sendData, remoteEP);UDPSock.ReceiveFrom(recvData, ref localEP);remoteEP.Port = ((IPEndPoint)localEP).Port;// Check the blocks and break free if equalif (_packetReader.CompareBlocks(sendData, recvData))break;}// Invoke TransferFinished EventTransferFinished.Invoke();break;}}}else if (opCode == OpCodes.ERROR){ErrorPacket transferError = _packetReader.ReadError(recvData);TransferFailed.Invoke(transferError.Code, transferError.Message);break;}// Send next packetUDPSock.SendTo(sendData, remoteEP);UDPSock.ReceiveFrom(recvData, ref localEP);remoteEP.Port = ((IPEndPoint)localEP).Port;}BReader.Close();UDPSock.Close();// Invoke Disconnected EventDisconnected.Invoke();return true;}}
}

7、MainForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;namespace TftpTest
{public partial class MainForm : Form{private TftpClient tftpClient = new TftpClient();private delegate void ProgressBarDelegate(int Maximum, int Value);private delegate void TransferButtonDelegate(bool Enabled);public MainForm(){InitializeComponent();tftpClient.Connected += new TftpClient.ConnectedHandler(TftpClient_Connected);tftpClient.Transferring += new TftpClient.TransferringHandler(TftpClient_Transferring);tftpClient.TransferFailed += new TftpClient.TransferFailedHandler(TftpClient_TransferFailed);tftpClient.TransferFinished += new TftpClient.TransferFinishedHandler(TftpClient_TransferFinished);tftpClient.Disconnected += new TftpClient.DisconnectedHandler(TftpClient_Disconnected);}private void TftpClient_Connected(){TransferButtonDelegate tBtnDel = new TransferButtonDelegate(TransferBtnDelegateFunction);btnTest.Invoke(tBtnDel, false);Console.WriteLine("Connected");}private void TransferBtnDelegateFunction(bool Enabled){lock (btnTest){btnTest.Enabled = Enabled;}}private void TftpClient_Transferring(long BytesTransferred, long BytesTotal){if (BytesTotal != 0){ProgressBarDelegate progressBarDel = new ProgressBarDelegate(ProgressBarDelegateFunction);progressBarTftp.Invoke(progressBarDel,new object[2] { (int)(BytesTotal / 10), (int)(BytesTransferred / 10) });Console.Write("{0}/{1} Bytes Transferred\r", BytesTransferred, BytesTotal);}elseConsole.Write(".");}private void ProgressBarDelegateFunction(int Maximum, int Value){lock (progressBarTftp){try{progressBarTftp.Maximum = Maximum;progressBarTftp.Value = Value;}catch (Exception e) { Console.WriteLine(e.ToString()); }}}private void TftpClient_TransferFailed(short ErrorCode, string ErrorMessage){Console.WriteLine("Error {0}: {1}", ErrorCode, ErrorMessage);}private void TftpClient_TransferFinished(){ProgressBarDelegate progressBarDel = new ProgressBarDelegate(ProgressBarDelegateFunction);progressBarTftp.Invoke(progressBarDel, new object[2] { 0, 0 });Console.WriteLine("\nTransfer Finished");MessageBox.Show("Transfer Complete", "TFTP Client",MessageBoxButtons.OK, MessageBoxIcon.Information);}private void TftpClient_Disconnected(){TransferButtonDelegate tBtnDel = new TransferButtonDelegate(TransferBtnDelegateFunction);btnTest.Invoke(tBtnDel, true);Console.WriteLine("Disconnected\n");}private void btnTest_Click(object sender, EventArgs e){progressBarTftp.Value = 0;TransferOptions tOptions = new TransferOptions();//tOptions.LocalFilename = "D:\\Project\\QDRP3\\Sw\\QDRP\\QDRP\\bin\\Debug\\Case\\PLBIN.bin";tOptions.LocalFilename = "F:\\Test\\PLBIN.bin";tOptions.RemoteFilename = "PLBIN.bin";tOptions.Host = "10.11.9.62";//tOptions.Action = getRadio.Checked == true ? TransferType.Get : TransferType.Put;tOptions.Action = TransferType.Get;Thread tThread = new Thread((ParameterizedThreadStart)delegate (object ScanOptions){TransferOptions options = (TransferOptions)ScanOptions;if (options.Action == TransferType.Get)tftpClient.Get(options.LocalFilename,options.RemoteFilename,options.Host);elsetftpClient.Put(options.LocalFilename, options.RemoteFilename, options.Host);});tThread.IsBackground = true;tThread.Start(tOptions);}}
}

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