Linux下获取CPUID、硬盘序列号与MAC地址(1)(2)

思路明确了，以下为实现代码：

static int

getdiskid (char *id, size_t max)

{

int fd;

struct hd_driveid hid;

FILE *fp;

char line[0x100], *disk, *root, *p;

fp = fopen ("/etc/mtab", "r");

if (fp == NULL)

{

fprintf (stderr, "No /etc/mtab file.\n");

return -1;

}

fd = -1;

while (fgets (line, sizeof line, fp) != NULL)

{

disk = strtok (line, " ");

if (disk == NULL)

{

continue;

}

root = strtok (NULL, " ");

if (root == NULL)

{

continue;

}

if (strcmp (root, "/") == 0)

{

for (p = disk + strlen (disk) - 1; isdigit (*p); p --)

{

*p = '\0';

}

fd = open (disk, O_RDONLY);

break;

}

}

fclose (fp);

if (fd < 0)

{

fprintf (stderr, "open hard disk device failed.\n");

return -1;

}

if (ioctl (fd, HDIO_GET_IDENTITY, &hid) < 0)

{

fprintf (stderr, "ioctl error.\n");

return -1;

}

close (fd);

snprintf (id, max, "%s", hid.serial_no);

fprintf (stdout, "get hard disk serial number: %s\n", id);

return 0;

}

获取MAC地址

通过创建一个socket，然后bind特定的IP地址，就可以通过ioctl得到这个套按地绑定的网络接口名称。然后再通过网络接口名称，得到MAC地址。

如果ioctl的第二个参数为SIOCGIFNAME, 则获得指定网络接口的名称；如果ioctl的第二个参数为SIOCGIFHWADDR，则获得指定网络接口的MAC地址

ioctl的第三个参数为struct ifreq ，在linux/if.h头文件里，struct ifreq声明如下：

struct ifreq

{

#define IFHWADDRLEN 6

union

{

char ifrn_name[IFNAMSIZ]; / if name, e.g. "en0" */

} ifr_ifrn;

union {

struct sockaddr ifru_addr;

struct sockaddr ifru_dstaddr;

struct sockaddr ifru_broadaddr;

struct sockaddr ifru_netmask;

struct sockaddr ifru_hwaddr;

short ifru_flags;

int ifru_ivalue;

int ifru_mtu;

struct ifmap ifru_map;

char ifru_slave[IFNAMSIZ]; /* Just fits the size */

char ifru_newname[IFNAMSIZ];

void * ifru_data;

struct if_settings ifru_settings;

} ifr_ifru;

}