如何知道Linux系统中端口是否打开 [英] How to know if a port is open or not in Linux system

问题描述

我需要查找端口Ex.在Linux系统上打开了端口8080.我正在寻找一个C或C ++ API调用，当给定端口号时，该调用将返回true或false或等效值.这仅需要在本地运行.我不想知道端口上是否有进程在监听，只有防火墙没有阻止它.

I need to find whether a port Ex. port 8080 is opened on a Linux system. I'm looking for a C or C++ API call that will return true or false or the equivalent when given a port number. This only needs to run locally. I don't want to know if there is a process listening on the port, only that is not blocked by the firewall.

我想做的等同于

 if( ! IsPortOpen(8080))
     cout << "please request IT to open port 8080 before running this tool";
     exit(1);
 }

推荐答案

我假设您正在本地计算机上寻找开放端口.有很多工具可以做到这一点.

I assume you are looking for open ports on the local machine. There are a lot of tools to do this.

更容易使用和理解的一个是

One of the easier to use and understand is

lsof -i

对于远程计算机，请尝试nmap或更简单，更基础的netcat.例如

For remote machines, try nmapor even easier and more basic netcat. For example

netcat targetHost 8080

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