Programmer Think

catalogue MQTT MQTT (Message Queuing Telemetry Transport) is a "lightweight" communication protocol based on Publish / Subscribe mode. The protocol is built on TCP/IP L4 Layer and released by IBM in 1999. It is a Publish / Subscribe message protocol designed for remote devices with low hardware performance and scenarios with poo ...

Multi process Create process When executing a program in multi process mode, you need to create a process before forking #include <unistd.h> //Create a process and return the number of the process in the program pid_t fork(void); //Return process number pid_t getpid(void); be careful: Child processes and parent processes shar ...

Server communication process Server: 1,adopt socket()Function to create a to receive a connection request socket 2,To construct the host connection address sockaddr_in structural morphology,include sin_family,sin_port,sin_addr Three members 3,binding sockaddr_in Structure and socket 4,adopt listen()Function will stocket Set to listenin ...

Experimental topic Design and implementation of network chat program Experimental purpose 1. Understand Socket The principle of communication, learn to use Socket for simple network programming, and write a chat program on this basis. 2. Understand Qt programming and be familiar with C + + language. overall design 1. Background knowledge So ...

Introduction before chapter This chapter focuses on the basic concept of switch, spanning tree protocol STP, content of switch table, switch configuration, switch mode, switch VLAN configuration, virtual LAN technology and switch STP configuration Test point 1: basic concept of switch 1. Basic concepts LAN switch is a network co ...

Analysis of CSRF and XSS preface Bloggers recently had an interview and encountered a question: * * What are the principles of CSRF and XSS? How to prevent CSRF and XSS** Because the blogger didn't understand this part deeply enough, the answer in the interview was not comprehensive enough. Today, let's discuss the mystery behind CSRF and X ...

introduction: After entering the intranet, it is a point-to-line and then face-to-face test. First, find out the current machine situation, such as the role in the domain and the services provided; Then use this as a springboard to collect information from other machines. When enough information is collected, the higher the possibility of winni ...

Gongzong No.: Black palm A blogger who focuses on sharing penetration testing, hot spots in the hacker circle and hacker tool technology area! preface During intranet penetration, a WebShell or CobaltStrike, Metasploit, etc. are just the beginning. It is more about moving horizontally within the intranet, expanding the results and reaching ...

Self use ~ do not spray 4.1.1 overview of network layer functions *Overview of network layer functions The packet is transmitted from the source end to the destination end to provide communication services for different hosts in the packet switching network *Network layer functions 1.Routing and forwarding 2.Heterogeneous network int ...

Simulate BGP group attribute policy configuration instance using eNSP Problem elicitation As shown in the figure There are two user network segments in AS 300 When users in AS 100 access these two network segments It is hoped to realize traffic sharing on R2 and R3 When AS 200 accesses these two network segments It is hoped that traf ...