Task 1: Server Socket Creation

Step 1

• In the PyCharm project created in L1, create a new Python file by right-clicking the projects folder, and selecting New > Python File. Name the file Server Echo.

Step 2

• Import the socket module to the file.

import socket

Step 3

• Create a socket variable.

s = socket.socket()

Step 4

• Bind the socket to accept connections from all IP addresses on port 4444.

s.bind(("0.0.0.0", 4321)) 

Step 5

• Allow only one connection to the socket.

s.listen(1)

Step 6

• Accept a connection from clients and save the connection object and address to variables.

conn, addr = s.accept()

Step 7

• Send a welcome message to the connected client, and request for a username.

conn.send("Welcome to the server!\nPlease insert your Username:".encode())

Step 8

• Accept the username sent by the client and save it to a variable.

username = conn.recv(2048).decode()

Step 9

• Request a password from the client.

conn.send("Please insert the Password:".encode())

Step 10

• Accept the password sent by the client and save it to a variable.

password = conn.recv(2048).decode()

Step 11

• Create a condition to check if the username is John and the password is 12345.

if username == "John" and password == "12345":

Step 12

• If the username and password are correct, send the client a welcome message.

conn.send(f"Welcome {username}".encode())

Step 13

• If the credentials are incorrect, send a message that tells the client that the password is wrong.

else:
    conn.send("Wrong username or password".encode())

Step 14

• Close the connection.

s.close()

Task 2: Client Socket Creation

Step 1

• In the PyCharm project created in L1, create a new Python file by right-clicking the projects folder, and selecting New > Python File. Name the file Client Echo.

Step 2

• Import the socket module to the file.

import socket

Step 3

• Create a socket variable.

s = socket.socket()

Step 4

• Connect the socket to the listener in the local host.

s.connect(("127.0.0.1", 4321)) 

Step 5

• Print the first welcome message from the server.

print(s.recv(2048).decode())

Step 6

• Get an input for the username and send it to the server.

s.send(input("").encode())

Step 7

• Print the second message from the server that requests the password.

print(s.recv(2048).decode())

Step 8

• Get an input for the password and send it to the server.

s.send(input("").encode())

Step 9

• Print the final answer from the server regarding authentication

print(s.recv(2048).decode())

Step 10

• Close the connection.

s.close()

Step 11

• Execute the server script.

Step 12

• Execute the client script.

Final Code

Client Message

"""Lab Objective: Create a login interface using sockets."""

import socket

s = socket.socket()
s.connect(("127.0.0.1", 4321))
print(s.recv(2048).decode())
s.send(input("").encode())
print(s.recv(2048).decode())
s.send(input("").encode())
print(s.recv(2048).decode())
s.close()

input("\nPress 'Enter' to exit the program")# prevents program from closing upon execution

Server Message

"""Lab Objective: Create a login interface using sockets."""
import socket

s = socket.socket()
s.bind(("0.0.0.0", 4321))
s.listen(1)
conn, addr = s.accept()
conn.send("Welcome to the server!\nPlease insert your Username:".encode())
username = conn.recv(2048).decode()
conn.send("Please insert the Password:".encode())
password = conn.recv(2048).decode()
if username == "John" and password == "12345":
    conn.send(f"Welcome {username}".encode())
else:
    conn.send("Wrong username or password".encode())

s.close()

input("\nPress 'Enter' to exit the program")# prevents program from closing upon execution