Answered Essay: Design a protocol for exchanging messages between the client and the server. For simplicity, let's make each mes

Design a protocol for exchanging messages between the client and the server. For simplicity, let’s make each message one line, ending with the end-of-line character. Please, don’t use binary data, and limit the elements of the message to words, spaces, and printable characters. Please, describe the protocol in detail and use python language.

Expert Answer

 

# The below program are developed using TCP/IP protocol using sockets
# the server program opena socket in TCP/IP and make sure that, this server program should not be respond with the same master socket
# we will bind a 6000 port number to the socket.
# the listen function is capable of handling 5 client requests
# the server programs open a port number on its local address
# server wukk try to read the sockets from the client requests. This task will be accomplished by the accept.
# After listen, the server program will recevices the data
# the for loop will borad cast the message
#============================================
#about client program
# the client program connects to the localaddress of the machine with the port number 6000
# recv method will receive the message from the server
# send method will send the data to the server program

import socket
import select

#Function to broadcast chat messages to all connected clients
def broadcast_data (sock, message):
for socket in CONNECTION_LIST:
if socket != server_socket and socket != sock :
try :
socket.send(message)
except :
# broken socket connection may be, chat client pressed ctrl+c for example
socket.close()
CONNECTION_LIST.remove(socket)

if __name__ == “__main__”:
# List to keep track of socket descriptors
CONNECTION_LIST = []
RECV_BUFFER = 1024 # Advisable to keep it as an exponent of 2
PORT = 6000

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind((“0.0.0.0”, PORT))
server_socket.listen(5)

# Add server socket to the list of readable connections
CONNECTION_LIST.append(server_socket)

print “Chat server started on port ” + str(PORT)

while 1:
# Get the list sockets which are ready to be read through select
read_sockets,write_sockets,error_sockets = select.select(CONNECTION_LIST,[],[])

for sock in read_sockets:
#New connection
if sock == server_socket:
# Handle the case in which there is a new connection recieved through server_socket
sockfd, addr = server_socket.accept()
CONNECTION_LIST.append(sockfd)
print “Client (%s, %s) connected” % addr
broadcast_data(sockfd, “[%s:%s] entered roomn” % addr)
#Some incoming message from a client
else:
# Data recieved from client, process it
try:
#In Windows, sometimes when a TCP program closes abruptly,
# a “Connection reset by peer” exception will be thrown
data = sock.recv(RECV_BUFFER)
if data:
broadcast_data(sock, “r” + ‘<‘ + str(sock.getpeername()) + ‘> ‘ + data)
except:
broadcast_data(sock, “Client (%s, %s) is offline” % addr)
print “Client (%s, %s) is offline” % addr
sock.close()
CONNECTION_LIST.remove(sock)
continue
server_socket.close()

# Name the above program as server.py
# run it as “python server.py”

#===============================================
# client program
#===============================================

import socket, select, string, sys

def prompt() :
sys.stdout.write(‘<You> ‘)
sys.stdout.flush()

#main function
if __name__ == “__main__”:

if(len(sys.argv) < 3) :
print ‘Usage : python telnet.py hostname port’
sys.exit()

hstname = sys.argv[1]
portnum = int(sys.argv[2])

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(2)

# connect to remote host
try :
s.connect((hostname, portnum))
except :
print ‘Unable to connect to server’
sys.exit()

print ‘Connected to server. Start sending messages’
prompt()

while 1:
socket_list = [sys.stdin, s]

# Get the list sockets which are readable
read_sockets, write_sockets, error_sockets = select.select(socket_list , [], [])

for sock in read_sockets:
#incoming message from server
if sock == s:
data = sock.recv(1024)
if not data :
print ‘nDisconnected from the server’
sys.exit()
else :
#print data
sys.stdout.write(data)
prompt()
#user entered a message
else :
msg = sys.stdin.readline()
s.send(msg)
prompt()

# Name the above program as client.py
# run it as “python client.py localhost 6000

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