Linux系统如何判断端口是否打开
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How to know if a port is open or not in Linux system
提问by VamsiKrishna
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.
我需要找到是否有端口 Ex。端口 8080 在 Linux 系统上打开。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 或等效项。这只需要在本地运行。我不想知道是否有进程在侦听端口，只是没有被防火墙阻止。
I want to do the equivalent of
我想做相当于
if( ! IsPortOpen(8080))
cout << "please request IT to open port 8080 before running this tool";
exit(1);
}
采纳答案by 0x90
I assume you are looking for open ports on the local machine. There are a lot of tools to do this.
我假设您正在寻找本地机器上的开放端口。有很多工具可以做到这一点。
One of the easier to use and understand is
更容易使用和理解的方法之一是
lsof -i
lsof -i
For remote machines, try nmapor even easier and more basic netcat. For example
对于远程机器，尝试nmap甚至更简单、更基本的netcat. 例如
netcat targetHost 8080
netcat targetHost 8080
