Linux C 获取本机所有网卡的 IP，Mask

0 运行环境

本机系统：Windows 10
虚拟机软件：Oracle VM VirtualBox 6
虚拟机系统：Ubuntu 18

1 代码

#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdio.h>

int get_localIPAndMask(char *ip,char *mask)
{

        int fd, intrface, retn = 0;

        struct ifreq buf[INET_ADDRSTRLEN];

        struct ifconf ifc;

        if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) >= 0)

        {

                ifc.ifc_len = sizeof(buf);

                // caddr_t,Linux内核源码里定义的：typedef void *caddr_t；

                ifc.ifc_buf = (caddr_t)buf;

                if (!ioctl(fd, SIOCGIFCONF, (char *)&ifc))

                {
                        intrface = ifc.ifc_len/sizeof(struct ifreq);

                        while (intrface-- > 0)

                        {
                                if (!(ioctl(fd, SIOCGIFADDR, (char *)&buf[intrface])))
                                {

                                        ip = (inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));

                                        printf("IP:%s
", ip);
                                }

                                 if (!(ioctl(fd, SIOCGIFNETMASK, (char *)&buf[intrface])))
                                {
                                        mask = (inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));

                                        printf("mask:%s
", mask);
                                }

                        }

                }

        close(fd);

        return 0;

        }

}

int main()

{
        char ip[64];

        memset(ip, 0, sizeof(ip));

        char mask[64];

        memset(mask, 0, sizeof(mask));

        get_localIPAndMask(ip,mask);

        return 0;
}

2 运行结果

与 ifconfig 验证一致，成功：