python获得linux网卡真实mac地址

linux下除了常见的工具获取mac地址以外，还可以通过查询

cat /sys/class/net/eth0/address 

来获得mac地址

但是通过ifconfig xxx hw ether xx:xx:xx:xx以后

所有获得的mac地址都是更改过的，如何获得原有网卡的真实ip呢

网上找了下方法

1：redhat下 在 /etc/sysconfig/hwconf里看到有原来的mac地址

2：写代码

c语言获取mac方法

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>

int main()
{
 int fd;
 struct ifreq ifr;
 fd = socket(AF_INET, SOCK_DGRAM, 0);
 ifr.ifr_addr.sa_family = AF_INET;
 strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
 ioctl(fd, SIOCGIFHWADDR, &ifr);
 close(fd);
 printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\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]);
 return 0;
}

python获取ip,mac方法参考（其实和c的写法基本一样）

http://hi.baidu.com/tigerjgh/blog/item/b3d92a12b57b5050f919b874.html

import socket,struct,fcntl


def get_hw_address(ifname):
     s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     info = fcntl.ioctl(s.fileno(),0x8927,struct.pack('256s', ifname[:15]))
     hwaddr = []
     print len(info)
     for char in info[18:24]:
         hdigit = '%02x' % struct.unpack('B',char)[0]
         hwaddr.append(hdigit)
     return ':'.join(hwaddr)

def getHwAddr(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    info = fcntl.ioctl(s.fileno(), 0x8927,  struct.pack('256s', ifname[:15]))
    return ''.join(['%02x:' % ord(char) for char in info[18:24]])[:-1]


print get_hw_address('eth1')
#print getHwAddr('eth1')

经过测试！！c和python的获取的mac都是改变的-v- ，所以上面两个代码找到的mac也不是真实mac

orz，失败鸟

SIOCGIFHWADDR 和 0x8927是一个意思

/usr/include/linux/sockios.h 里有定义