Question

Write a program that shows the operation of TCP/IP socket. You are allowed to use any programming language. You have to submit your code with a screenshot of the result after running the code. Useful links: https://www.javaworld.com/article/2077322/core-java-sockets-programming-in-java-atutorial.html https://www.c-sharpcorner.com/article/socket-programming-in-cpp-using-boost-asio-tcpserver-and-client/

Answer 1

TO TRANSFER MESSAGE

Client_d.py

import sys
from socket import socket, AF_INET, SOCK_DGRAM

# simply put the I.P address of computer you want to send message
# in this i had shown put the localhost
SERVER_IP = 'localhost'
# change the port number if you want
# but change at both client and server
PORT_NUM = 5000
SIZE = 2048
print("Client sending packets \n".format(SERVER_IP, PORT_NUM))

myMessage1 = ""
mySocket = socket(AF_INET, SOCK_DGRAM)
i = 0
# server closes if you type Exit
# else client can send message as long as he wants
while myMessage1 != str('Exit'):
    myMessage1 = input()
    # encoding the message
    mySocket.sendto(myMessage1.encode('utf-8'), (SERVER_IP, PORT_NUM))
sys.exit()

server_d.py

from socket import socket, gethostbyname, AF_INET, SOCK_DGRAM

# port number over which transfer takes place
PORT_NUM = 5000
# message size should be smaller than this
SIZE = 2048

hostName = gethostbyname('0.0.0.0')

mySocket = socket(AF_INET, SOCK_DGRAM)
mySocket.bind((hostName, PORT_NUM))

print("Listening on port {0}\n".format(PORT_NUM))

# Listens unless client send exit message
while True:
    (data, addr) = mySocket.recvfrom(SIZE)
    # decoding receiving message
    print(data.decode())
sys.exit()

TO TRANSFER FILES

Client.py

import socket

s = socket.socket()
# enter the server IP address and port number over which you are sending file
# cannot be localhost as we cannot send file to our own system
s.connect(("192.168.43.136", 1111))
# type the name of file
f = open("life_hack.mp4", "rb")
l = f.read(2048)
while l:
    s.send(l)
    l = f.read(2048)
s.close()

server.py

import socket
import sys

s = socket.socket()
s.bind(("0.0.0.0", 1111))
s.listen(10)

i = 1
while True:
    sc, address = s.accept()
    print(address)
    # extension should be known before hand i.e., which type of file client is going to send
    f = open('file_' + str(i) + ".mp4", 'wb')
    i = i + 1
    while True:

        l = sc.recv(2048)
        f.write(l)

        if not l:
            break

    f.close()
    sc.close()
    print('File copied.')

s.close()