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catalogue I. Introduction Second, write source code 2.1 create server and client 2.3 create function Three renderings IV. summary V. source code I. Introduction Readers can understand the code and self-made by mastering the basic knowledge of multithreading, io flow and network programming. It is very easy to understand and learn. T ...

XMLDecoder deserialization vulnerability underlying The reference articles have been analyzed in great detail. Here I mainly talk about the final implementation. That is, the use of the Expression class import java.beans.Expression; public class test { public static void main(String[] args)throws Exception { Parameter();//With ...

CentOS 7 firewall policy configuration necessary for operation and maintenance beginners 1. Preface: All distributions above CentOS 7 try to bring their own firewalld firewall, and firewalld brings iptables firewall. The reason is that the firewall policy of iptables is handled by the netfilter network filter at the kernel level, while firewa ...

socket IPC    socket API was originally designed for network communication, but later developed an IPC mechanism based on the socket framework, namely UNIX Domain Socket. Although the network socket can also be used for interprocess communication of the same host (through loopback address 127.0.0.1), but UNIX Domain Socket is mor ...

Encryption and decryption is nothing more than ensuring data security. Three problems need to be solved to ensure data security: Confidentiality, integrity, authentication (anti forgery and denial) Confidentiality: the transmission content is not in clear text. Even if the data is intercepted by the outside world, it cannot be interprete ...

Network communication data transmission TCP/IP model PORT IP Network programming: connect computers distributed in different geographical regions with special external equipment with communication lines to form a large-scale and powerful network system, so that many computers can easily transfer information to each other and share hardware, so ...

1, Create socket socket is a readable, writable, controllable and closable file descriptor (integer number) // Function prototype int socket(int domain, int type, int protocol) //Parameter interpretation domain: Specifies the protocol used by the system. Can be TCP/IP Protocol family, or UNIX Protocol family. The corresponding values are ...

Basic routing policy configuration Principle overview: Route policy is widely used. For example, it can specify that the router only publishes some routes that meet specific conditions when publishing routes, only receives some routes that 1 meet specific conditions when receiving routes, only introduces some routes that meet specific co ...

Routing control BGP route control includes controlling the release and reception of routes. BGP routing control is generally realized through routing policy, that is, specific routes are matched through the routing matching tool, and the release and reception of routes are controlled through the routing policy tool Route matching tools: ACL ...

The first "Hecheng Cup" Henan Hebi CTF network security challenge Official account: Th0r security 1 $ tshark -r timu.pcapng http|grep ' GET ' > timu-get $ for i in `seq 1 30`; do a=`grep "),$i,1)" timu-get|tail -1|cut -d= -f3|cut - d- -f1`;b=`printf "%x" $a`;echo -n $b; done 666c61677b77317265736841524b5f657a5f31736e74697 ...