获取在Linux上接口的IP地址 [英] Get IP address of an interface on Linux

问题描述

我怎样才能获得的IPv4 界面的Linux上从C code类地址？

How can I get the IPv4 address of an interface on Linux from C code?

例如，我想获得的IP地址（如果有的话）指定为eth0。

For example, I'd like to get the IP address (if any) assigned to eth0.

推荐答案

试试这个：

#include <stdio.h>
#include <unistd.h>
#include <string.h> /* for strncpy */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>

int
main()
{
 int fd;
 struct ifreq ifr;

 fd = socket(AF_INET, SOCK_DGRAM, 0);

 /* I want to get an IPv4 IP address */
 ifr.ifr_addr.sa_family = AF_INET;

 /* I want IP address attached to "eth0" */
 strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);

 ioctl(fd, SIOCGIFADDR, &ifr);

 close(fd);

 /* display result */
 printf("%s\n", inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));

 return 0;
}

在code样品从这里 服用。

The code sample is taken from here.

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