gethostbyname

When the C API function in Linux exception, the errno variable (need include errno.h) is usually assigned an integer value, different values represent different meanings, you can see the reason for this value speculation, in the actual programming

The DNS Host entry contains DNS information about a domin name or IP address in DNS database.1 struct hostent{2 Char *h_name; 3 Char *h_aliases; 4 int H_addrtype; 5 int h_length; 6 Char * *h_addr_list; 7 };The Hostinfo program,

In this article, we are not prepared to discuss technical issues on a large scale. Just to tell you how we will get the IP address of a host. We can do this with the network API in the Win32 API, but in the. NET platform, what should we do? In fact,

Typically, there is only one server on the service side, which employs fork () to handle connections from multiple customers. The basic program is that the server waits for a connection, accepts (accept ()) the connection, and then fork () a

The code is as follows Copy Code $DM = ' www.111cn.net ';$ip = gethostbyname ($DM);echo gethostbyaddr ($IP);Echo $ip; Two output results are the same,/*About gethostbyname syntax String gethostbyname (String $hostname)

We do some more work for the client's writing. This time we use non-blocking IO to implement the Connect function. int Connect (intconststruct sockaddr *addr, socklen_t Addrlen);Non-blocking IO has the following uses: 1. The process of

The main purpose of this paper is to get the server sockets and client sockets, and make a simple package, using C language. Tcp_server Server-side FD acquisition is mainly divided into the following steps: 1. Create a socket, this step

This article refers to the first chapter of Python network programmingImport socketHelp (socket)Functions:Socket ()--Create a new socket objectSocketpair ()--Create a pair of new socket objects [*]FROMFD ()--Create a socket object from an open file

January 27, 2015 The gethostbyname function of the Linux GNU glibc standard library burst into a buffer overflow vulnerability, with the vulnerability number cve-2015-0235. The hacker can realize the remote code execution through the GetHostByName

First, WSAStartup function int WSAStartup ( 　WORD wVersionRequested, 　LPWSADATA lpWSAData ); A program using the socket must call the WSAStartup function before using the socket. The first parameter of the function indicates the version of the

In the TCP/IP network structure, in order to guarantee the network security, the network personnel often need to add the firewall on the router, prohibits the illegal user to use the FTP and so on the security harm large TCP/IP protocol to access

C + + implementation gets the IP address of the domain name GetHostIP.cpp: Defines the entry point for a console application. #include "stdafx.h" #include #include #include #include #pragma comment (lib, "Ws2_32.lib") int main (int argc,

Main control Program upfile.php?#####################################################################Project Name:test#Author: lanf#Home page:http://lanf.yeah.net#E-mail:imbusy@263.net#Time: 2001. 9####################################################

Measured for a long time, finally measured through, a total of two cases. The first case: send yourself to yourself. Configuration: Client and server IP are set to the same IP, I am using 127.0.0.1 during the testing process. The rest remains the

Python methods for obtaining local IP addresses in windows and linux, pythonlinux This example summarizes how python obtains the local IP address of a local machine in windows and linux. Share it with you for your reference. The specific analysis is

I. Preface:Microsoft's. Net Framework provides two namespaces for network programming: System. Net and System. Net. Sockets. By properly using the classes and methods, we can easily compile various network applications. Such network applications can

By: dahubaobaoI. PrefaceWith the development of the Internet, more and more Unix/Linux systems are used, and it is no longer difficult to intrude into a Unix/Linux system. Usually, after the intrusion is successful, one or several backdoors will be

This is a very special method. using it to communicate without a port may bring some other advantages due to its particularity. However, this method also has a major disadvantage.It may be named, for example, Jiurl255. It does not use tcp, udp, or

Cisco's Security Intelligence Research Team TalosGroup pointed out that the GHOST vulnerability exposed by Qualys recently allowed hackers to execute arbitrary programs from the remote end. Although it was a major vulnerability, it was not so

Python can be used to obtain the IP address of the local machine in a simple way. However, the methods in Windows and Linux are slightly different. The following describes in detail how to obtain the IP address in Windows... python can be used to