Computer Networks lab 5 socket programming

 Socket Programming using C/C++/Java / python.

a. TCP Client, TCP Server

b. b. UDP Client, UDP Server.

Example: UDP Server using Python

import socket

 

localIP     = "127.0.0.1"

localPort   = 20001

bufferSize  = 1024

 

msgFromServer       = "Hello UDP Client"

bytesToSend         = str.encode(msgFromServer)

 

# Create a datagram socket

UDPServerSocket = socket.socket(family=socket.AF_INET,

type=socket.SOCK_DGRAM)

 

# Bind to address and ip

UDPServerSocket.bind((localIP, localPort))

 

print("UDP server up and listening")

 

# Listen for incoming datagrams

while(True):

    bytesAddressPair = UDPServerSocket.recvfrom(bufferSize)

    message = bytesAddressPair[0]

    address = bytesAddressPair[1]

    clientMsg = "Message from Client:{}".format(message)

    clientIP  = "Client IP Address:{}".format(address)

    

    print(clientMsg)

    print(clientIP)

   

    # Sending a reply to client

    UDPServerSocket.sendto(bytesToSend, address)

Output:

UDP server up and listening

Message from Client:b"Hello UDP Server"

Client IP Address:("127.0.0.1", 51696)

 Example: UDP Client using Python

import socket

 

msgFromClient       = "Hello UDP Server"

bytesToSend         = str.encode(msgFromClient)

serverAddressPort   = ("127.0.0.1", 20001)

bufferSize          = 1024

 

# Create a UDP socket at client side

UDPClientSocket = socket.socket(family=socket.AF_INET,

type=socket.SOCK_DGRAM)

 

# Send to server using created UDP socket

UDPClientSocket.sendto(bytesToSend, serverAddressPort)

 

msgFromServer = UDPClientSocket.recvfrom(bufferSize)

 

msg = "Message from Server {}".format(msgFromServer[0])

print(msg)