Client-Server-Networking

File sharing protocol is implemented between a client and a server using File Transfer Protocol (FTP) which uses TCP/IP protocol to communicate between ports.

Language and Libraries

Python 3 is used for implementing this client server architecture. Libraries used are:

• socket
• os, sys
• hashlib
• tqdm
• struct
• time
• subprocess
• shutil

Running

There are two files, client.py and server.py. Both the files can be put in same folder in your local machine or different folders. Open two different terminals and in the respective folder run:

python3 client.py

python3 server.py

In the client side, Enter your name prompt will come and upon entering a virtual terminal will be created. If the connection with the server is successful Server bind complete will be printed on the server side.

Commands

ls

Displays the files in the folder in which server.py is run.

lc

Displays the files in the folder in which client.py is run.

quit

Quits the connection with the server

history

Displays the commands used in the current session.

IndexGet longlist

Displays the entire list of files in folder of the server with filesize, timestamp, name and filetype.

IndexGet longlist *.txt word

Displays the entire list of *.txt files with a particular word in it in folder of the server with filesize, timestamp, name and filetype.

IndexGet shortlist <YYYY-MM-DD_HH:MM:SS> <YYYY-MM-DD_HH:MM:SS>

Displays the entire list of files in folder of the server with filesize, timestamp, name and filetype between a specific set of timestamps.

IndexGet shortlist <YYYY-MM-DD_HH:MM:SS> <YYYY-MM-DD_HH:MM:SS> *.filetype

Displays the list of files of type *.txt or *.pdf in folder of the server with filesize, timestamp, name and filetype between a specific set of timestamps.

FileHash checkall

Displays the filename, MD5 Checksum of the file on both the server and client side and last modified timestamp of all the files in the server side. It checks the hash of the files on both the client and server side and prints whether they match or not.

FileHash verify filename

Displays the filename, MD5 Checksum of the file on both the server and client side and last modified timestamp of the file in the server side. It checks the hash of the file on both the client and server side and prints whether they match or not.

FileUpload filename mode

Uploads file with either TCP or UDP protocols.

FileDownload filename mode

Downloads file from the server using TCP or UDP and displays filename, filesize, MD5checksum and timestamp.

Cache verify filename

The size of the cache is 3 and the cache is session specific. This commands checks the presence of file in the session cache and if it is there it prints the Filename and Filesize and if it is not it calls the FileDownload command with TCP and downloads it in the Cachefolder. If the cache is full then the file with least number of requests in the current session is removed form Cachefolder.

Cache show

The size of the cache is 3 and the cache is session specific. This commands displays the Filename and Filesize of all the files in the Cachefolder.