Linux下获取CPUID、硬盘序列号与MAC地址(1)(3)

其中，ifrn_name为网络接口的名称，ifr_ifru.ifru_hwaddr为网络接口的MAC地址。

#ifndef MAX_IFINDEX

# define MAX_IFINDEX 8

#endif

static int

getmacaddr (const char *ip, char *id, size_t max)

{

int i, sockfd;

struct sockaddr_in *loc;

struct ifreq req[1];

sockfd = socket (AF_INET, SOCK_DGRAM, 0);

if (sockfd < 0)

{

fprintf (stderr, "Unable to create socket.\n");

return -1;

}

for (i = 0; i <= MAX_IFINDEX; ++ i)

{

req->ifr_ifindex = i;

if (ioctl (sockfd, SIOCGIFNAME, req) < 0)

{

fprintf (stderr, "ioctl error: %s\n", strerror (errno));

continue;

}

if (ioctl (sockfd, SIOCGIFADDR, req) < 0)

{

fprintf (stderr, "ioctl interface index [%d] error: %s\n", i, strerror (errno));

continue;

}

loc = (struct sockaddr_in *) (&(req->ifr_ifru.ifru_addr));

if (loc->sin_addr.s_addr == inet_addr (ip))

{

fprintf (stderr, "%s bind at %s.\n", ip, req->ifr_name);

break;

}

}

if (i > MAX_IFINDEX)

{

fprintf (stderr, "input IP error.\n");

close (sockfd);

return -1;

}

if (ioctl (sockfd, SIOCGIFHWADDR, req) < 0)

{

fprintf (stderr, "ioctl error: %s\n", strerror (errno));

close (sockfd);

return -1;

}

close (sockfd);

snprintf (id, max, "%02X%02X%02X%02X%02X%02X",

req->ifr_hwaddr.sa_data[0] & 0xff,

req->ifr_hwaddr.sa_data[1] & 0xff,

req->ifr_hwaddr.sa_data[2] & 0xff,

req->ifr_hwaddr.sa_data[3] & 0xff,

req->ifr_hwaddr.sa_data[4] & 0xff,

req->ifr_hwaddr.sa_data[5] & 0xff);

fprintf (stdout, "MAC address of %s: [%s].\n", req->ifr_name, id);

return 0;

}