Question

Answer as soon as possible!!!

Code must be done with Python

Develop a basic File Transfer Protocol (FTP) application that transmits files between a client and a server using Python. Your programs should implement four FTP commands: (1) change directory (cd), (2) list directory content (ls), (3) copy a file from client to a server (put) and (4) copy a file from a server to a client (get). Implement two versions of the program: one that uses stock TCP for reliable data transfer; and one that implements stop-and-wait reliability at the application layer and uses UDP for transport.

So therefore it has to have client-server TCP implementation and UPD implementation.

Answer 1

FTP programming python using ftplib library, are connect to FTp servers,or download and upload files.

FTP is network protocol it use for transfering files with client and server on a computer network,it has DELE,RETR or CWD communication with FTP commands.

1) Change Directory :- The use purpose for change directory cwd() method the current working directory.

for example:-

FTP with ftplib, as cover both uploading and downloading files with a remote server.

// Set has domain name or server ip address//
ftp = FTP ('server.ip')
ftp.login(user= 'username', pass = 'password')
// Will connect you to your remote server. You can then change into a specific directory.

ftp.cwd('/abc/')

2) List Directory Content:- It has retrieve a file or directory listing in transfer mode of LIST retrieves a list of files and information about those files.

It use for retrlines command.

for examples:-

ftps.retrlines('LIST') // Set  list directory content securely.

3,4) Copy a file from client to a server:- FTP is the process of copying or moving a file for computer to anathor network or Internet connection.

It's create a server that listens on a particular port, and server will be responce for file receiving, the client will try to connect to the server and send a file of any type.

Its socket module going to use build-in with python and with socket operations, it use for internet are behind of any connection or any network.

for examples:-

// Set import socket

import socket

BUFFER_SIZE = 5016 // Set 5016 byte

// It specify the IP address or port of the server to connect name file we want to send.

host = "192.168.1.110"

port = 5001

filename = "abcData.csv"

filesize = os.path.getsize

Filename it use to current directory,and use for absolute path to that file somewhere in your computer.

The os.path.getsize get the size of file in byte.