PYTHON SOCKETS

PLEASE DO NOT SUBMIT PREVIOUS CHEGG SOLUTIONS I'VE CHECKED THEM ALL

Check server.py and client.py code and answer the questions below.

# Client

from socket import *

s = socket(AF_INET, SOCK_DGRAM)

host = '127.0.0.1'

port = 1234

buf =1024

addr = (host,port)

req = input("Enter the filename and the line number needed separated by comma: ")

#Example: req = 'book2.txt, 5'

s.sendto(req.encode('ascii'), addr)

print("Data requested.")

data, addr = s.recvfrom(buf)

print(data.decode())

s.close()

# Server

from socket import *

host = '127.0.0.1'

port = 1234

s = socket(AF_INET,SOCK_DGRAM)

s.bind((host,port))

addr = (host,port)

buf=1024

data,addr = s.recvfrom(buf)

data = data.decode()

data = data.split(',')

f = open(data[0],'r')

lines = f.readlines()

index = int(data[1]) - 1

s.sendto(lines[index].encode('ascii'), addr)

s.close()

1 - What modification(s) can you do to the code #1 and code #2 to make the server and client use the TCP Protocol?

2 - Modify the server code to send an error to the client if the file requested does not exist.

3 - Modify the server code to send an error to the client if the line requested does not exist.

4 - Modify the client code to request the last line if the client didn't write a line number in their request. Example req = 'book2.txt'