get interface HW address

最新推荐文章于 2025-12-16 17:06:35 发布

原创最新推荐文章于 2025-12-16 17:06:35 发布 · 606 阅读

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文章标签：

#interface #struct #stream #socket #linux

本文介绍两种获取设备MAC地址的方法：一种是在用户空间通过ioctl系统调用；另一种是在内核空间直接利用net_device结构体。这两种方法均适用于Linux环境。

1. in userspace use ioctl

/*************some error in code***********************/

static int __init getmac_init()
{
        int sock_id;
        struct ifreq ifr;
        char *macstr = "";
        unsigned char *mac = "";

        memset(&ifr,0,sizeof(struct ifreq));
        sock_id = socket(PF_INET, SOCK_STREAM, 0);
        if(sock_id == -1){
                return -1;
        }
        sprintf(ifr.ifr_name,"eth0");

        if(ioctl(sock_id, SIOCGIFHWADDR, &ifr) == 0){
                memcpy(mac,ifr.ifr_hwaddr.sa_data,6);
                sprintf(macstr,"%02X:%02X:%02X:%02X:%02X:%02X",mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);
        }
        printk("the mac address is:/n %s /n",macstr);

        sock_release(sock_id);

        return 0;
}

/************************************/

2.in kernel space use struct net_device

/****************/

#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
#define DEV_GET_BY_NAME(name) dev_get_by_name(name);
#else
#define DEV_GET_BY_NAME(name) dev_get_by_name(&init_net, name);
#endif

struct net_device *dev = NULL;

unsigned char *name = "eth0"

dev = DEV_GET_BY_NAME(name);

pirntk("HW address %02X:%02X:%02X:%02X:%02X:%02X/n",

dev->dev_addr[0],dev->dev_addr[1],dev->dev_addr[2],

dev->dev_addr[3],dev->dev_addr[4],dev->dev_addr[5])

/***************/