Implementation of FTP client and server

This repository hosts a project that implements the FTP Client and Server as part of the coursework for Computer Networks (CNT5106C) under the department of Computer Science of the University of Florida.

Problem Statement

Implement a simple version of FTP client/server software. It consists of two programs: ftpclient and ftpserver. First, the ftpserver is started on a computer. It listens on a certain TCP port. Then, the ftpclient is executed on the same or a different computer.
The server’s address and port number are supplied in the command line, for example, ftpserver sand.cise.ufl.edu 5106.
The client will prompt for username and password.

After logging in, the user can issue three commands at the client side:

• dir is to retrieve the list of file names available at the server,
• get <filename> is to retrieve a file from the server,
• upload < filename> is to upload a file to the server.

The implementation does not have to conform to the FTP standard. Data and command may use the same TCP connection or different connections. The server should support multiple concurrent clients.

Execution

Folder location : cd < ProjectPath >/src

Compilation:

• Server -> javac com/UFL/FTPServer/FtpServer.java
  
• Client1 -> javac com/UFL/FTPClient/Client1/FtpClient.java
  
• Client2 -> javac com/UFL/FTPClient/Client2/FtpClient.java
  

Run:

• Server -> java com.UFL.FTPServer.FtpServer
  
• Client1 -> java com.UFL.FTPClient.Client1.FtpClient
  
• Client2 -> java com.UFL.FTPClient.Client2.FtpClient
  

The username and password can be found at users.txt file under /src folder. Each pair of username and password are mentioned in each line of the users.txt file.

Test Cases

Click to expand

• Start the server
• Start client 1
• Start client 2
• Try an invalid command on one of the clients (other than ftpclient <IP port>, dir, get <filename> and upload <filename>)
• Try one of the valid commands dir, get <filename> and upload <filename>.
• Try command ftpclient <IP port> with wrong IP or port number
• Command ftpclient <IP port> with correct IP and port number
• Try one of the commands ftpclient <IP port>, dir, get <filename> and upload <filename>
• Try logging in with the wrong username or password
• Login with correct username and password
• Try an invalid command on the client (other than ftpclient <IP port>, dir, get <filename> and upload <filename>)
• Try command ftpclient <IP port>.
• Try uploading a file that doesn’t exist
• Command upload for a valid file from client 1 to server
• Command dir from client 2
• Try get wrong file name
• Command “get” on client 2 for the file that client 1 uploaded to the server

Warning

Before connecting the client with the server, set the correct path to the variables sharedPath and userList in FTPServer.java file, else clients won't be able to connect to the server.

userList is the variable which contains the path of the file that maintains list of username and password.

sharedPath is the variable which contains the path of the folder that is shared by the server to the client and where client can upload the files.