嵌入式 获取linux下的网卡的MAC地址

#include<stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <arpa/inet.h>

#define inaddrr( x) ( *( structin_addr * )&ifr->x[sizeof( sa.sin_port) ] )
#define IFRSIZE( ( int )( size* sizeof(struct ifreq ) ) )

int main ( void )
{
    unsigned char* u;
    int sockfd, size= 1;
    struct ifreq * ifr;
    struct ifconf ifc;
    struct sockaddr_in sa;

    if ( 0 > ( sockfd =socket( AF_INET, SOCK_DGRAM,IPPROTO_IP ) ) )
    {
        fprintf(stderr, "Cannot open socket.\n" );
        exit( EXIT_FAILURE );
    }
    ifc.ifc_req =NULL;
    do
    {
        ++size;
        /* realloc buffer size until no overflow occurs */
        if ( NULL == ( ifc.ifc_req =realloc( ifc.ifc_req, IFRSIZE) ) )
        {
            fprintf(stderr, "Out of memory.\n" );
            exit(EXIT_FAILURE );
        }
        ifc.ifc_len = IFRSIZE;
        if ( ioctl( sockfd,SIOCGIFCONF, &ifc ) )
        {
            perror("ioctl SIOCFIFCONF" );
            exit(EXIT_FAILURE );
        }
    } while ( IFRSIZE <= ifc.ifc_len);
    ifr = ifc.ifc_req;
    for ( ; ( char* )ifr < ( char* )ifc.ifc_req+ ifc.ifc_len;++ifr )
    {
        if ( ifr->ifr_addr.sa_data== ( ifr + 1 )->ifr_addr.sa_data)
        {
            continue;/* duplicate, skip it */
        }
        if ( ioctl( sockfd,SIOCGIFFLAGS, ifr) )
        {
            continue;/* failed to get flags, skip it */
        }
        printf("Interface: %s\n", ifr->ifr_name);
        if ( 0 == ioctl( sockfd,SIOCGIFHWADDR, ifr) )
        {
            switch ( ifr->ifr_hwaddr.sa_family)
            {
            case ARPHRD_NETROM:
            case ARPHRD_ETHER:
            case ARPHRD_PPP:
            case ARPHRD_EETHER:
            case ARPHRD_IEEE802:
                break;
            default:
                printf("\n" );
                continue;
            }
            u = (unsigned char * )&ifr->ifr_addr.sa_data;
            if ( u[0]+ u[1]+ u[2]+ u[3]+ u[4]+ u[5])
            {
                printf("HW Address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n",
                        u[0], u[1], u[2], u[3], u[4], u[5]);
            }
        }
        printf("\n" );
    } /* end of for */
    close( sockfd);

    free(ifc.ifc_req);
    return( EXIT_SUCCESS );
}



输入网路接口名获取MAC地址

#include<stdio.h> #include<sys/socket.h> #include<net/if.h> #include<sys/ioctl.h> int main(int agrc,char*agrv[]) {     struct ifreq ifr;     char *ptr;     int skfd;     if((skfd=socket(AF_INET,SOCK_DGRAM,0))<0){     perror("open socket error");     return -1;     }     strcpy(ifr.ifr_name,agrv[1]);     if(ioctl(skfd,SIOCGIFHWADDR,&ifr)<0){     perror("ioctl error");     return -1;     }     ptr=(char*)&ifr.ifr_addr.sa_data;     printf("%02X:%02X:%02X:%02X:%02X:%02X\n",(ptr[0]&0377),(ptr[1]&0377),(ptr[2]&0377),(ptr[3]&0377),(ptr[4]&0377),(ptr[5]&0377)); }   Interface: lo Interface: eth0 HW Address: 00:50:56:a9:70:64 The mac addr is 00:50:56:a9:70:64