用ioctl设置mac地址 得到当前的ip地址，子网掩码等信息

#include <sys/types.h>  /* for socket(2) and related bits and pieces */

#include <sys/socket.h> /* for socket(2) */

#include <net/if.h>     /* for struct ifreq */

#include <net/if_arp.h> /* for ARPHRD_ETHER */

#include <sys/ioctl.h>  /* for IOCTL's */

#include <stdio.h>      /* for fprintf etc */

#include <unistd.h>     /* for close */





int main(int argc,char **argv)

{

    struct ifreq ifr;

    int skfd;



    if (argc<3) {

        fprintf(stderr,"usage:/n%s interface hwaddr/n",argv[1]);

        return 1;

    }



    /* Fill in the structure */

    snprintf(ifr.ifr_name, IFNAMSIZ, "%s", argv[1]);

    ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;



    /* TODO: write some code to parse argv[2] into ifr.ifr_hwaddr.sa_data */

    /* memcpy(&ifr.ifr_hwaddr.sa_data, argv[2], sizeof(ether.address)); */

    /* Create a socket fd */

    skfd = socket(PF_INET,SOCK_STREAM,0);



    /* call the IOCTL */

    if (ioctl(skfd, SIOCSIFHWADDR, &ifr) < 0) {

        perror("ioctl(SIOCSIFHWADDR)");

        return 1;

    }



    /* cleanup */

    close(skfd);



    /* we're out of here! */

    return 0;

}



#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <sys/ioctl.h>

#include <net/if.h>



static void usage(){

    printf("usage : ipconfig interface /n");

    exit(0);

}



int main(int argc,char **argv)

{

    struct sockaddr_in *addr;

    struct sockaddr     sa;   

    struct ifreq ifr;

    char *name,*address;

    int sockfd;

    unsigned   char   mac[6];



    if(argc != 2) 

         usage();

    else

         name = argv[1];



    sockfd = socket(AF_INET,SOCK_DGRAM,0);

    strncpy(ifr.ifr_name,name,IFNAMSIZ-1);



    if(ioctl(sockfd,SIOCGIFADDR,&ifr) == -1)

         perror("ioctl error"),exit(1);



    addr = (struct sockaddr_in *)&(ifr.ifr_addr);

    address = inet_ntoa(addr->sin_addr);

    printf("inet addr: %s ",address);



    if(ioctl(sockfd,SIOCGIFBRDADDR,&ifr) == -1)

         perror("ioctl error"),exit(1);



    addr = (struct sockaddr_in *)&ifr.ifr_broadaddr;

    address = inet_ntoa(addr->sin_addr);

    printf("broad addr: %s ",address);



    if(ioctl(sockfd,SIOCGIFNETMASK,&ifr) == -1)

         perror("ioctl error"),exit(1);



    addr = (struct sockaddr_in *)&ifr.ifr_addr;

    address = inet_ntoa(addr->sin_addr);

    printf("inet mask: %s ",address);



    printf("/n");

    if(ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1)

         perror("ioctl error"), exit(1);



    memcpy(&sa,   &ifr.ifr_addr,   sizeof(struct   sockaddr_in));

    memcpy(mac,   sa.sa_data,   sizeof(mac));

    fprintf(stdout,   "%s   mac:   %.2X:%.2X:%.2X:%.2X:%.2X:%.2X/n",

            name,   mac[0],   mac[1],   mac[2],   mac[3],   mac[4],   mac[5]);



    exit(0);

}