Crack Zip Passwords

 

Socket Programming in Python 

Sockets and the socket API are used to send messages across a network. They provide a form of inter process communication. The network can be a logical, local network to the computer, or one that’s physically connected to an external network, with its own connections to other networks.

 

 

Echo Server

#!/usr/bin/env python3

import socket

HOST = '127.0.0.1'  # Standard loopback interface address (localhost)
PORT = 65432        # Port to listen on (non-privileged ports are > 1023)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.bind((HOST, PORT))  # associating with specific network interface and port number
    s.listen()           # listening for incoming connections
    conn, addr = s.accept()   # accepting the connections
    with conn:
        print('Connected by', addr)   
        while True:
            data = conn.recv(1024) # recieve data upto 1024 bytes, then it will block
            if not data:
                break
            conn.sendall(data) # data send by the client is echoed back

 

Echo client 

#!/usr/bin/env python3

import socket

HOST = '127.0.0.1'  # The server's hostname or IP address
PORT = 65432        # The port used by the server

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(b'Hello, world') # data send by the client
    data = s.recv(1024)

print('Received', repr(data))

Open a terminal window and navigate to the folder containing the scripts.

The terminal will appear to hang as we there is no connections active now only the server is running

 Now, run the echo-client script in another terminal,

Now in the echo-server window, 

SO THIS IS SINGLE SERVER AND CLIENT SCRIPT