如何从C中的袜子结构获取IP地址?

问题描述

我正在编写简单的服务器/客户端，并尝试获取客户端IP地址并将其保存在服务器端，以确定哪个客户端应进入关键部分.我用Google搜索了好几次，但是找不到从袜子结构中获取IP地址的正确方法.

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.

我相信这是在服务器接受客户端请求后从袜子结构获取IP的一种方法.更具体地讲，服务器执行后

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)

谢谢

推荐答案

确定您正在使用IPV4，然后执行以下操作:

OK assuming you are using IPV4 then do the following:

struct sockaddr_in* pV4Addr = (struct sockaddr_in*)&client_addr;
struct in_addr ipAddr = pV4Addr->sin_addr;

如果您随后希望将IP地址作为字符串，请执行以下操作:

If you then want the ip address as a string then do the following:

char str[INET_ADDRSTRLEN];
inet_ntop( AF_INET, &ipAddr, str, INET_ADDRSTRLEN );

IPV6也很容易...

IPV6 is pretty easy as well ...

struct sockaddr_in6* pV6Addr = (struct sockaddr_in6*)&client_addr;
struct in6_addr ipAddr       = pV6Addr->sin6_addr;

获取字符串几乎与IPV4相同

and getting a string is almost identical to IPV4

char str[INET6_ADDRSTRLEN];
inet_ntop( AF_INET6, &ipAddr, str, INET6_ADDRSTRLEN );

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