FTPFactory.cs

 

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;

namespace FtpLib
{

    public class FTPFactory
    {

        private string remoteHost, remotePath, remoteUser, remotePass, mes;
        private int remotePort, bytes;
        private Socket clientSocket;

        private int retValue;
        private Boolean debug;
        private Boolean logined;
        private string reply;

        private static int BLOCK_SIZE = 512;

        Byte[] buffer = new Byte[BLOCK_SIZE];
        Encoding ASCII = Encoding.ASCII;

        public FTPFactory()
        {

            remoteHost = "localhost";
            remotePath = ".";
            remoteUser = "anonymous";
            remotePass = "[e-mail]";
            remotePort = 21;
            debug = false;
            logined = false;

        }
        public void setRemoteHost(string remoteHost)
        {
            this.remoteHost = remoteHost;
        }
        public string getRemoteHost()
        {
            return remoteHost;
        }
        public void setRemotePort(int remotePort)
        {
            this.remotePort = remotePort;
        }
        public int getRemotePort()
        {
            return remotePort;
        }
        public void setRemotePath(string remotePath)
        {
            this.remotePath = remotePath;
        }
        public string getRemotePath()
        {
            return remotePath;
        }
        public void setRemoteUser(string remoteUser)
        {
            this.remoteUser = remoteUser;
        }
        public void setRemotePass(string remotePass)
        {
            this.remotePass = remotePass;
        }
        public string[] getFileList(string mask)
        {

            if (!logined)
            {
                login();
            }

            Socket cSocket = createDataSocket();

            sendCommand("NLST " + mask);

            if (!(retValue == 150 || retValue == 125))
            {
                throw new IOException(reply.Substring(4));
            }

            mes = "";

            while (true)
            {
                int bytes = cSocket.Receive(buffer, buffer.Length, 0);
                mes += ASCII.GetString(buffer, 0, bytes);
                if (bytes < buffer.Length)
                {
                    break;
                }
            }

            char[] seperator = { '\n' };
            string[] mess = mes.Split(seperator);

            cSocket.Close();

            readReply();
            if (retValue != 226)
            {
                throw new IOException(reply.Substring(4));
            }
            return mess;

        }
        public long getFileSize(string fileName)
        {

            if (!logined)
            {
                login();
            }

            sendCommand("SIZE " + fileName);
            long size = 0;

            if (retValue == 213)
            {
                size = reply.Substring(4).ToInt64();
            }
            else
            {
                throw new IOException(reply.Substring(4));
            }
            return size;

        }
        public void login()
        {

            clientSocket = new Socket(AddressFamily.AfINet, SocketType.SockStream, ProtocolType.ProtTCP);
            IPEndPoint ep = new IPEndPoint(DNS.Resolve(remoteHost), remotePort);
            int i = clientSocket.Connect(ep);
            if (i != 0)
            {
                throw new IOException("Couldn't connect to remote server");
            }

            readReply();
            if (retValue != 220)
            {
                close();
                throw new IOException(reply.Substring(4));
            }
            if (debug)
                Console.WriteLine("USER " + remoteUser);
            sendCommand("USER " + remoteUser);
            if (!(retValue == 331 || retValue == 230))
            {
                cleanup();
                throw new IOException(reply.Substring(4));
            }
            if (retValue != 230)
            {
                if (debug)
                    Console.WriteLine("PASS xxx");

                sendCommand("PASS " + remotePass);
                if (!(retValue == 230 || retValue == 202))
                {
                    cleanup();
                    throw new IOException(reply.Substring(4));
                }
            }

            logined = true;
            Console.WriteLine("Connected to " + remoteHost);

            chdir(remotePath);

        }
        public void setBinaryMode(Boolean mode)
        {

            if (mode)
            {
                sendCommand("TYPE I");
            }
            else
            {
                sendCommand("TYPE A");
            }
            if (retValue != 200)
            {
                throw new IOException(reply.Substring(4));
            }
        }
        public void download(string fileName)
        {
            download(fileName, false);
        }
        public void download(string fileName, Boolean resume)
        {


            if (!logined)
            {
                login();
            }

            setBinaryMode(true);
            long totalSize = 0;
            try
            {
                totalSize = getFileSize(fileName);
            }
            catch (Exception)
            {
                throw new Exception("File Not Found " + fileName);
            }


            Console.WriteLine("Downloading file " + fileName + " from " + remoteHost + "/" + remotePath);

            if (!File.FileExists(fileName))
            {
                Stream st = File.Create(fileName);
                st.Close();
            }

            FileStream output = new FileStream(fileName, FileMode.Open);

            Socket cSocket = createDataSocket();

            long offset = 0;

            if (resume)
            {

                offset = output.Length;

                if (offset > 0)
                {
                    sendCommand("REST " + offset);
                    if (retValue != 350)
                    {
                        //throw new IOException(reply.Substring(4)); 
                        //Server may not support resuming. 
                        offset = 0;
                    }
                }

                if (offset > 0)
                {
                    if (debug)
                    {
                        Console.WriteLine("seeking to " + offset);
                    }
                    long npos = output.Seek(offset, SeekOrigin.Begin);
                    Console.WriteLine("new pos=" + npos);
                }
            }

            sendCommand("RETR " + fileName);

            if (!(retValue == 150 || retValue == 125))
            {
                throw new IOException(reply.Substring(4));
            }

            float iCnt = 0;
            float per = 0, oldPer = 1;

            while (true)
            {

                bytes = cSocket.Receive(buffer, buffer.Length, 0);
                output.Write(buffer, 0, bytes);

                // Showing the progress. 1..50 
                iCnt += bytes;
                per = (int)((iCnt / totalSize) * 100);
                if (per != oldPer && per % 2 == 0)
                {
                    Console.Write(".");
                    oldPer = per;
                }

                if (bytes < buffer.Length)
                {
                    break;
                }
            }

            output.Close();
            cSocket.Close();
            Console.WriteLine("");

            readReply();

            if (!(retValue == 226 || retValue == 250))
            {
                throw new IOException(reply.Substring(4));
            }

        }
        public void upload(string fileName)
        {
            upload(fileName, false);
        }
        public void upload(string fileName, Boolean resume)
        {

            if (!logined)
            {
                login();
            }

            Socket cSocket = createDataSocket();
            long offset = 0;

            if (resume)
            {

                try
                {

                    setBinaryMode(true);
                    offset = getFileSize(fileName);

                }
                catch (Exception)
                {
                    offset = 0;
                }
            }

            if (offset > 0)
            {
                sendCommand("REST " + offset);
                if (retValue != 350)
                {
                    //throw new IOException(reply.Substring(4)); 
                    //Remote server may not support resuming. 
                    offset = 0;
                }
            }

            sendCommand("STOR " + fileName);
            if (!(retValue == 125 || retValue == 150))
            {
                throw new IOException(reply.Substring(4));
            }

            // open input stream to read source file 
            FileStream input = new FileStream(fileName, FileMode.Open);

            if (offset != 0)
            {

                if (debug)
                {
                    Console.WriteLine("seeking to " + offset);
                }
                input.Seek(offset, SeekOrigin.Begin);
            }

            //for progress bar 
            long totalSize = input.Length - offset;
            float iCnt = 0;
            int per = 0, oldPer = 1;
            Console.WriteLine("Uploading file " + fileName + " to " + remotePath);

            while ((bytes = input.Read(buffer, 0, buffer.Length)) > 0)
            {

                cSocket.Send(buffer, bytes, 0);

                // Showing the progress. 1..50 
                iCnt += bytes;
                per = (int)((iCnt / totalSize) * 100);
                if (per != oldPer && per % 2 == 0)
                {
                    Console.Write(".");
                    oldPer = per;
                }
            }
            input.Close();

            Console.WriteLine("");

            cSocket.Close();

            readReply();
            if (!(retValue == 226 || retValue == 250))
            {
                throw new IOException(reply.Substring(4));
            }
        }
        public void deleteRemoteFile(string fileName)
        {

            if (!logined)
            {
                login();
            }

            sendCommand("DELE " + fileName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

        }
        public void renameRemoteFile(string oldFileName, string newFileName)
        {

            if (!logined)
            {
                login();
            }

            sendCommand("RNFR " + oldFileName);

            if (retValue != 350)
            {
                throw new IOException(reply.Substring(4));
            }

            // known problem 
            // rnto will not take care of existing file. 
            // i.e. It will overwrite if newFileName exist 
            sendCommand("RNTO " + newFileName);
            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

        }
        public void mkdir(string dirName)
        {

            if (!logined)
            {
                login();
            }

            sendCommand("MKD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

        }
        public void rmdir(string dirName)
        {

            if (!logined)
            {
                login();
            }

            sendCommand("RMD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

        }
        public void chdir(string dirName)
        {
            if (dirName.Equals("."))
            {
                return;
            }

            if (!logined)
            {
                login();
            }

            sendCommand("CWD " + dirName);

            if (retValue != 250)
            {
                throw new IOException(reply.Substring(4));
            }

            this.remotePath = dirName;

            Console.WriteLine("Current directory is " + remotePath);

        }
        public void close()
        {
            if (clientSocket != null)
            {
                sendCommand("QUIT");
            }
            cleanup();
            Console.WriteLine("Closing...");
        }
        public void setDebug(Boolean debug)
        {
            this.debug = debug;
        }
        private void readReply()
        {
            mes = "";
            reply = readLine();
            retValue = reply.Substring(0, 3).ToInt32();
        }
        private void cleanup()
        {
            if (clientSocket != null)
            {
                clientSocket.Close();
                clientSocket = null;
            }
            logined = false;
        }
        private string readLine()
        {

            while (true)
            {
                bytes = clientSocket.Receive(buffer, buffer.Length, 0);
                mes += ASCII.GetString(buffer, 0, bytes);
                if (bytes < buffer.Length)
                {
                    break;
                }
            }

            char[] seperator = { '\n' };
            string[] mess = mes.Split(seperator);
            if (mes.Length > 2)
            {
                mes = mess[mess.Length - 2];
            }
            else
            {
                mes = mess[0];
            }
            if (!mes.Substring(3, 1).Equals(" "))
            {
                return readLine();
            }
            if (debug)
            {
                for (int k = 0; k < mess.Length - 1; k++)
                {
                    Console.WriteLine(mess[k]);
                }
            }
            return mes;
        }
        private void sendCommand(String command)
        {
            Byte[] cmdBytes = Encoding.ASCII.GetBytes((command + "\r\n").ToCharArray());
            clientSocket.Send(cmdBytes, cmdBytes.Length, 0);
            readReply();
        }
        private Socket createDataSocket()
        {

            sendCommand("PASV");

            if (retValue != 227)
            {
                throw new IOException(reply.Substring(4));
            }

            int index1 = reply.IndexOf('(');
            int index2 = reply.IndexOf(')');
            string ipData = reply.Substring(index1 + 1, index2 - index1 - 1);
            int[] parts = new int[6];

            int len = ipData.Length;
            int partCount = 0;
            string buf = "";
            for (int i = 0; i < len && partCount <= 6; i++)
            {

                char ch = ipData.Substring(i, 1).ToChar();
                if (Char.IsDigit(ch))
                    buf += ch;
                else if (ch != ',')
                {
                    throw new IOException("Malformed PASV reply: " + reply);
                }

                if (ch == ',' || i + 1 == len)
                {
                    try
                    {
                        parts[partCount++] = buf.ToInt32();
                        buf = "";
                    }
                    catch (Exception)
                    {
                        throw new IOException("Malformed PASV reply: " + reply);
                    }
                }
            }

            string ipAddress = parts[0] + "." + parts[1] + "." +
            parts[2] + "." + parts[3];

            int port = (parts[4] << 8) + parts[5];

            Socket s = new Socket(AddressFamily.AfINet, SocketType.SockStream, ProtocolType.ProtTCP);
            IPEndPoint ep = new IPEndPoint(DNS.Resolve(ipAddress), port);

            int sucess = s.Connect(ep);

            if (sucess != 0)
            {
                throw new IOException("Can't connect to remote server");
            }

            return s;
        }

    }
}





public class Test
{

    public static void Main()
    {

        try
        {

            Console.WriteLine("Starting...");

            FTPFactory ff = new FTPFactory();
            ff.setDebug(true);
            ff.setRemoteHost("192.168.10.19");
            ff.setRemoteUser("jaimon");
            ff.setRemotePass("mathew");
            ff.login();

            string[] fileNames = ff.getFileList("*.*");
            for (int i = 0; i < fileNames.Length; i++)
            {
                Console.WriteLine(fileNames[i]);
            }
            ff.download("Readme.zip", true);
            ff.close();

        }
        catch (Exception e)
        {
            Console.WriteLine("Caught Error :" + e.Message);
        }
    }
}