python network programming pdf

Basic Programming of network security in python C/S Mode1. socket programming Socket types include: -- TCP socket and UDP socket.Regular customer service mode. -- Raw socketUsed for sniffing and injection 2. C/S Mode The C/S (Client/Server, Client/Server) mode, also known as the C/S structure, is a model that gradually

socket. Because the network version of these sockets (AF_INET) uses Internet Protocol IP to search for hosts in the network, the entire system is combined with both protocols (TCP and IP)2. No connection socketA non-connected socket is called a datagram type of socket, communication does not establish a connection, transmission can not guarantee the repeatability, the sequence, the reliability, may be sent

server socket is heard or received a connection request from the client socket, it responds to the client socket request, establishes a new thread, sends a description of the server socket to the client, once the client confirms, the connection is good. Service-side socket base is in listening state(3) Socket two modesThere are two ways to operate a socket: connection-oriented and non-connected. A connection-oriented socket operation is like a phone that must establish a connection and a call,

some reason the IP address is not properly assigned, the NAK message is sent as a response informing the user that the appropriate IP address cannot be assigned. DHCP Release When the user no longer needs to use the assigned IP address, it will proactively send the release message to the DHCP server, informing the server that the user no longer needs to assign an IP address, and the DHCP server will release the bound lease. DHCP decline After the DHCP clien

= self.request addr = Self . client_address # above two lines of code, equal to CONN,ADDR = Socket.accept (), but in the Socketserver module has been packaged for us, but also for our packaging including bind (), listen (), a Ccept () method while 1:accept_data = str (CONN.RECV (1024x768), encoding= "UTF8") print (ACCE Pt_data) If Accept_data = = "Byebye": Break send_data = bytes (Input ("> Gt;>>> "), encoding=" UTF8 ") Conn.sendall (Send_data) conn.close () if __name__ = = ' __main__ ': Sever

.zipHttp://itunes.apple.com/us/book/python-for-informatics/id554638579?mt=13Http://www-personal.umich.edu/~csev/books/py4inf/ibooks//python_for_informatics.ibooksHttp://www.py4inf.com/codehttp://www.greenteapress.com/thinkpython/thinkCSpy/http://allendowney.com/You can use BeautifulSoup to pull out the different parts of each label, with the following code: fromBs4ImportBeautifulSoupImportUrllib.requesturl= Input ('Enter-') HTML=urllib.request.urlopen

1. Get the return value[email protected] ~]# cat request.py#!/usr/bin/env python #encoding: Utf-8import REQUESTSR = requests.get ("/HTTP/ Www.baidu.com ") print R[[email protected] ~]# python request.py2.get URL with parameters[email protected] ~]# cat request1.py#!/usr/bin/env python #encoding: Utf-8import requestspayload = {"Key1": "Value1", "KEy2 ":" value2 "}

and port number for this machine2.2 Getpeername () Peer IP and port number#!/usr/bin/env python# Information arppingingimport socketprint "Creating socket..."s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)print "done."print "Connect socket..."s.connect(("www.arppinging.com",80))print "done."# 获取本机的IP和portprint "Connected from",s.getsockname()# 获取对端的IP和portprint "Connected to",s.getpeername()RunCreating socket...done.Connect socket...done.Connect

! = ["'] andInfo! = [' ']: -file_name = info[1] in iffile_name! ="' andfile_name! =' ': -File_list.append (File_name.strip (' ')) to exceptFilenotfounderror: + Print('= = = [FTP] Download file no found') - exit () the self.ftp.download (file_list) * Print('= = = [FTP] Exit') $ Panax NotoginsengClient =communidemoclient () -Client.action ()Related reading1. BOOTP theory2. BOOTP Python implementations

,data,cookies=djl) #入参带有cookie, when the parameter is passed in, specify the cookies= parameter print( Req.json ())Example 5:Get request with Header' Http://127.0.0.1/api/user/all_stu ' = { 'Referer':'http://127.0.0.1/' = Requests.get (url,headers=header) #指定 headers= parameter print (Req.json ()) Example 6:Request to upload a file' Http://127.0.0.1/api/file/file_upload ' = { 'file': Open (R'C:\Users\bjniuhanyang\Desktop\ Figure \6bd9026dt935575932465690.jpg','rb')} #参数, If you upload

We often say that the computer network communication, it is worth two, or more than one computer, for data transmission.Since the development of computer network, people use a lot of protocols, but the most commonly used is the TCP/IP protocol, which is actually a set of protocols.Of course, when using Python for network