python取代netcat過程分析

# -*- coding: utf-8 -*- 
import socket 
target_host = "www.baidu.com" 
target_port = 80 
#建立socket對象,建立包含AF_INET,和SOCK_STREAM參數(shù)的socket對象。AF_INET參數(shù)鎖門我們使用IPV4地址，SOCK_STREAM說明這是一個TCP客戶端 
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
#連接客戶端 
client.connect((target_host, target_port)) 
 
#send some data 
client.send("GET / HTTP/1.1\r\nHsot:baidu.com\r\n\r\n") 
 
#get some data 
response = client.recv(4096) 
print response 

# -*- coding: utf-8 -*- 
import socket 
import threading 
 
bind_ip = '0.0.0.0' 
bind_port=9999 
server = socket.socket(socket.AF_INET,socket.SOCK_STREAM) 
server.bind((bind_ip, bind_port)) 
server.listen(5) 
print "[+]listening on %s, %d"%(bind_ip,bind_port) 
 
#創(chuàng)建客戶處理線程 
def handle_client(client_socket): 
 #打印客戶端發(fā)送得到的內(nèi)容 
 request = client_socket.recv(1024) 
 print "[*]Recived:%s"%request 
  
 #返回數(shù)據(jù)包 
 client_socket.send("Fuck You All!") 
 client_socket.close() 
  
while True: 
 client, addr=server.accept() 
 print "[*]Accepted connection from:%s:%d"%(addr[0], addr[1]) 
  
 #掛起客戶端，處理傳入數(shù)據(jù) 
 client_handler = threading.Thread(target=handle_client,args=(client,)) 
 client_handler.start()