Python c/S mode BASIC programming for network security

1. Socket programming

Socket types include:

--TCP socket and UDP socket.

• The General Customer service Area mode.

--raw socket

• Can be used for sniffing and injecting

2. C/S mode

c/S (client/server, client/server) mode, also known as C/s structure, is a model that grew up in the the late 1980s and is a kind of software system architecture. The key of C/s structure lies in the distribution of functions, some functions are performed on the front end machine (i.e. client), and some functions are placed on the backend machine (i.e. server).
　　

3.python C/S programming

Server Section Code:
　　

#!/usr/bin/env python# _*_ Coding:utf-8 _*_ImportSocketTcpsock =Socket.Socket(Socket. Af_inet,Socket. SOCK_STREAM) Tcpsock.Bind(("0.0.0.0",8080)) Tcpsock.Listen(5)Print ' Waiting for client connections ... '(Client, (ip,sock)) = Tcpsock.Accept()Print ' Set up a connection, the other IP is: 'IpPrint ' Start receiving data ... 'data =' Start ' whileLen (data): data = client.recv(2048)Print ' received data: ', data client.Send(' return data: '+data)Print ' Close connection ... 'Client.Close()Print ' Close service ... 'Tcpsock.Close()

Run the server-side Python program and test it with a command:

nc192.168.1.958080

Server response:

Client test:

4. Options for the client

• Processed sequentially
• Multi-Threaded Server
• Multi-Process Server
• Non-blocking mode socket (using Select)

Python c/S mode BASIC programming for network security