如何从sock结构得到的IP地址在C？ [英] how to get ip address from sock structure in c ?

问题描述

我写简单的服务器/客户端，并试图让客户端IP地址，并将其保存在服务器端来决定哪些客户应该进入临界区。我用Google搜索了好几遍也没有找到合适的方式，从sock结构获得IP地址。

I'm writing simple server/client and trying to get client ip address and save it on server side to decide which client should get into critical section. I googled it several times but couldn't find proper way to get ip address from sock structure.

我相信这是一种方式来获得服务器之后，从袜子结构IP接受来自客户端的请求
更具体地说是在C服务器后执行

I believe this is a way to get ip from sock struct after server accept request from client more specifically in c after server execute

csock = accept(ssock, (struct sockaddr *)&client_addr, &clen) 

感谢

推荐答案

假设 client_addr 是结构SOCKADDR_IN （这通常是这样）。你可以从IP地址（如32位无符号整数） client_addr.sin_addr.s_addr 。

Assuming client_addr is a struct sockaddr_in (which it usually is). You can get the IP address (as a 32-bit unsigned integer) from client_addr.sin_addr.s_addr.

您可以将其转换为字符串是这样的：

You can convert it to a string this way:

printf("%d.%d.%d.%d\n",
  int(client.sin_addr.s_addr&0xFF),
  int((client.sin_addr.s_addr&0xFF00)>>8),
  int((client.sin_addr.s_addr&0xFF0000)>>16),
  int((client.sin_addr.s_addr&0xFF000000)>>24));

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