linux检测网线插拔小程序

最新推荐文章于 2025-02-12 00:02:47 发布

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最新推荐文章于 2025-02-12 00:02:47 发布 · 4.5k 阅读

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CC 4.0 BY-SA版权

本文介绍了一种在Linux应用层检测网线插拔状态的方法，通过分析ifconfig源码，利用ioctl函数获取接口状态。代码示例在Ubuntu 10.04上运行，适用于UCLinux环境，涉及网络设备驱动与内核通信。

参考网络资料,经整理验证ok.

#include <sys/socket.h>

#include <sys/ioctl.h>
#include <linux/if.h>
#include <string.h>
#include <stdio.h>

int net_detect(char* net_name)
{
    int skfd = 0;
    struct ifreq ifr;
   struct sockaddr_in *pAddr = NULL;
    skfd = socket(AF_INET, SOCK_DGRAM, 0);
    if(skfd < 0)
    {
        printf("%s:%d Open socket error!\n", __FILE__, __LINE__);
        return -1;
    }
    strcpy(ifr.ifr_name, net_name);
    if(ioctl(skfd, SIOCGIFFLAGS, &ifr) <0 )
    {
        printf("%s:%d IOCTL error!\n", __FILE__, __LINE__);
        printf("Maybe ethernet inferface %s is not valid!", ifr.ifr_name);
        close(skfd);
        return -1;
    }
    if(ifr.ifr_flags & IFF_RUNNING)
    {
        printf("%s is running :)\n", ifr.ifr_name);
    }
    else
    {
        printf("%s is not running :(\n", ifr.ifr_name);
    }
    if(ioctl(skfd,SIOCGIFADDR,&ifr)<0)
    {
       printf("SIOCGIFADDR IOCTL error!\n");
       close(skfd);
       return -1;
    }
   pAddr = (struct sockaddr_in *)&(ifr.ifr_addr);
   printf("ip addr :[%s]\n", inet_ntoa(pAddr->sin_addr));
    if(ioctl(skfd,SIOCGIFHWADDR,&ifr)<0)
    {
       printf("SIOCGIFHWADDR IOCTL error!\n");
       close(skfd);
       return -1;
    }
    printf("mac addr: %02x:%02x:%02x:%02x:%02x:%02x\n",
       (unsigned char)ifr.ifr_hwaddr.sa_data[0],
       (unsigned char)ifr.ifr_hwaddr.sa_data[1],
       (unsigned char)ifr.ifr_hwaddr.sa_data[2],
       (unsigned char)ifr.ifr_hwaddr.sa_data[3],
       (unsigned char)ifr.ifr_hwaddr.sa_data[4],
       (unsigned char)ifr.ifr_hwaddr.sa_data[5]);
   close(skfd);

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