原文：http://blog.chinaunix.net/uid-25885064-id-3125167.html
#include <sys/ioctl.h>
#include <netinet/in.h>
#include
<net/if.h>
#include <string.h>
#include
<stdio.h>
int get_mac(char* mac)
{
int
sockfd;
struct ifreq tmp;
char mac_addr[30];
sockfd
= socket(AF_INET, SOCK_STREAM, 0);
if( sockfd <
0)
{
perror("create socket fail\n");
return -1;
}
memset(&tmp,0,sizeof(struct ifreq));
strncpy(tmp.ifr_name,"eth0",sizeof(tmp.ifr_name)-1);
if(
(ioctl(sockfd,SIOCGIFHWADDR,&tmp)) < 0 )
{
printf("mac ioctl
error\n");
return
-1;
}
sprintf(mac_addr,
"%02x%02x%02x%02x%02x%02x",
(unsigned
char)tmp.ifr_hwaddr.sa_data[0],
(unsigned
char)tmp.ifr_hwaddr.sa_data[1],
(unsigned
char)tmp.ifr_hwaddr.sa_data[2],
(unsigned
char)tmp.ifr_hwaddr.sa_data[3],
(unsigned
char)tmp.ifr_hwaddr.sa_data[4],
(unsigned
char)tmp.ifr_hwaddr.sa_data[5]
);
printf("local mac:%s\n",
mac_addr);
close(sockfd);
memcpy(mac,mac_addr,strlen(mac_addr));
return
0;
}
int main(int argc,char **argv)
{
char
mac[30];
get_mac(mac);
}
#ifndef _NET_IF_H
#define _NET_IF_H 1
#include
<features.h>
#ifdef __USE_MISC
# include
<sys/types.h>
# include <sys/socket.h>
#endif
/*
Length of interface name. */
#define IF_NAMESIZE
16
struct if_nameindex
{
unsigned int
if_index; /* 1, 2, ... */
char
*if_name; /* null terminated name: "eth0",
... */
};
#ifdef __USE_MISC
/* Standard interface flags.
*/
enum
{
IFF_UP = 0x1,
/* Interface is up. */
# define
IFF_UP IFF_UP
IFF_BROADCAST =
0x2, /* Broadcast address valid. */
# define
IFF_BROADCAST IFF_BROADCAST
IFF_DEBUG =
0x4, /* Turn on debugging. */
#
define IFF_DEBUG IFF_DEBUG
IFF_LOOPBACK
= 0x8, /* Is a loopback net. */
#
define IFF_LOOPBACK IFF_LOOPBACK
IFF_POINTOPOINT = 0x10, /* Interface is point-to-point
link. */
# define IFF_POINTOPOINT IFF_POINTOPOINT
IFF_NOTRAILERS = 0x20, /* Avoid use of trailers. */
#
define IFF_NOTRAILERS IFF_NOTRAILERS
IFF_RUNNING = 0x40, /* Resources
allocated. */
# define IFF_RUNNING
IFF_RUNNING
IFF_NOARP = 0x80,
/* No address resolution protocol. */
# define
IFF_NOARP IFF_NOARP
IFF_PROMISC =
0x100, /* Receive all packets. */
# define
IFF_PROMISC IFF_PROMISC
/* Not
supported */
IFF_ALLMULTI = 0x200, /*
Receive all multicast packets. */
# define
IFF_ALLMULTI IFF_ALLMULTI
IFF_MASTER
= 0x400, /* Master of a load
balancer. */
# define IFF_MASTER
IFF_MASTER
IFF_SLAVE = 0x800,
/* Slave of a load balancer. */
# define
IFF_SLAVE IFF_SLAVE
IFF_MULTICAST =
0x1000, /* Supports multicast. */
# define
IFF_MULTICAST IFF_MULTICAST
IFF_PORTSEL = 0x2000, /* Can set media type. */
#
define IFF_PORTSEL IFF_PORTSEL
IFF_AUTOMEDIA = 0x4000, /* Auto media select active.
*/
# define IFF_AUTOMEDIA
IFF_AUTOMEDIA
IFF_DYNAMIC = 0x8000 /*
Dialup device with changing addresses. */
# define
IFF_DYNAMIC IFF_DYNAMIC
};
/* The ifaddr
structure contains information about one address of an
interface. They are maintained by the different address
families,
are allocated and attached when an address is set, and
are linked
together so all addresses for an interface can be
located. */
struct ifaddr
{
struct
sockaddr ifa_addr; /* Address of interface.
*/
union
{
struct sockaddr
ifu_broadaddr;
struct sockaddr
ifu_dstaddr;
} ifa_ifu;
struct iface *ifa_ifp; /* Back-pointer to interface.
*/
struct ifaddr *ifa_next; /* Next
address for interface. */
};
# define
ifa_broadaddr ifa_ifu.ifu_broadaddr /*
broadcast address */
# define ifa_dstaddr
ifa_ifu.ifu_dstaddr /* other end of link
*/
/* Device mapping structure. I‘d just gone off and designed
a
beautiful scheme using only loadable modules with arguments
for
driver options and along come the PCMCIA people
8)
Ah well. The get() side of this is good for WDSETUP, and
it‘ll be
handy for debugging things. The set side is fine for
now and being
very small might be worth keeping for clean
configuration. */
struct ifmap
{
unsigned long int mem_start;
unsigned long int
mem_end;
unsigned short int
base_addr;
unsigned char irq;
unsigned char dma;
unsigned char
port;
/* 3 bytes spare */
};
/* Interface
request structure used for socket ioctl‘s. All interface
ioctl‘s must have parameter definitions which begin with
ifr_name.
The remainder may be interface specific.
*/
struct ifreq
{
# define IFHWADDRLEN
6
# define IFNAMSIZ IF_NAMESIZE
union
{
char
ifrn_name[IFNAMSIZ]; /* Interface 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 int ifru_flags;
int ifru_ivalue;
int ifru_mtu;
struct ifmap ifru_map;
char
ifru_slave[IFNAMSIZ]; /* Just fits the size
*/
char ifru_newname[IFNAMSIZ];
__caddr_t ifru_data;
} ifr_ifru;
};
# define ifr_name ifr_ifrn.ifrn_name
/* interface name */
# define ifr_hwaddr
ifr_ifru.ifru_hwaddr /* MAC address
*/
# define ifr_addr
ifr_ifru.ifru_addr /* address
*/
# define ifr_dstaddr
ifr_ifru.ifru_dstaddr /* other end of p-p
lnk */
# define ifr_broadaddr
ifr_ifru.ifru_broadaddr /* broadcast address
*/
# define ifr_netmask
ifr_ifru.ifru_netmask /* interface net mask
*/
# define ifr_flags ifr_ifru.ifru_flags
/* flags */
# define
ifr_metric ifr_ifru.ifru_ivalue /*
metric */
# define
ifr_mtu ifr_ifru.ifru_mtu /*
mtu */
# define
ifr_map ifr_ifru.ifru_map /* device
map */
# define
ifr_slave ifr_ifru.ifru_slave /* slave
device */
# define
ifr_data ifr_ifru.ifru_data /* for use by
interface */
# define ifr_ifindex
ifr_ifru.ifru_ivalue /* interface
index */
# define
ifr_bandwidth ifr_ifru.ifru_ivalue /* link
bandwidth */
# define ifr_qlen
ifr_ifru.ifru_ivalue /* queue length
*/
# define ifr_newname
ifr_ifru.ifru_newname /* New name
*/
# define _IOT_ifreq
_IOT(_IOTS(char),IFNAMSIZ,_IOTS(char),16,0,0)
# define _IOT_ifreq_short
_IOT(_IOTS(char),IFNAMSIZ,_IOTS(short),1,0,0)
# define
_IOT_ifreq_int
_IOT(_IOTS(char),IFNAMSIZ,_IOTS(int),1,0,0)
/* Structure used in
SIOCGIFCONF request. Used to retrieve interface
configuration for machine (useful for programs which must know
all
networks accessible). */
struct
ifconf
{
int
ifc_len; /* Size of
buffer. */
union
{
__caddr_t ifcu_buf;
struct ifreq
*ifcu_req;
} ifc_ifcu;
};
#
define ifc_buf ifc_ifcu.ifcu_buf /* Buffer
address. */
# define ifc_req
ifc_ifcu.ifcu_req /* Array of structures. */
# define
_IOT_ifconf _IOT(_IOTS(struct ifconf),1,0,0,0,0) /* not right
*/
#endif /* Misc. */
__BEGIN_DECLS
/*
Convert an interface name to an index, and vice versa. */
extern
unsigned int if_nametoindex (__const char *__ifname) __THROW;
extern char
*if_indextoname (unsigned int __ifindex, char *__ifname) __THROW;
/*
Return a list of all interfaces and their indices. */
extern struct
if_nameindex *if_nameindex (void) __THROW;
/* Free the data returned from
if_nameindex. */
extern void if_freenameindex (struct if_nameindex
*__ptr) __THROW;
__END_DECLS
#endif /* net/if.h */
通过C语言获取MAC地址(转),布布扣,bubuko.com
原文地址：http://www.cnblogs.com/shizhai/p/3746527.html
