linuxc .txt

本程序使用linux 下的C语言得到本机的硬件地址的一个小程序

/*用C语言得到本机的硬件地址 */
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>

#define MAXINTERFACES 16

int main(argc, argv)
register int argc;
register char *argv[];
{
    register int fd, intrface, retn = 0;
    struct ifreq buf[MAXINTERFACES];
    struct arpreq arp;
    struct ifconf ifc;

    if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) {
	ifc.ifc_len = sizeof buf;
	ifc.ifc_buf = (caddr_t) buf;
	if (!ioctl(fd, SIOCGIFCONF, (char *) &ifc)) {
	    intrface = ifc.ifc_len / sizeof(struct ifreq);
	    printf("interface num is intrface=%d\n\n\n", intrface);
	    while (intrface-- > 0) {
		printf("net device %s\n", buf[intrface].ifr_name);

/*Jugde whether the net card status is promisc*/
		if (!(ioctl(fd, SIOCGIFFLAGS, (char *) &buf[intrface]))) {
		    if (buf[intrface].ifr_flags & IFF_PROMISC) {
			puts("the interface is PROMISC");
			retn++;
		    }
		} else {
		    char str[256];

		    sprintf(str, "cpm: ioctl device %s",
			    buf[intrface].ifr_name);
		    perror(str);
		}

/*Jugde whether the net card status is up*/
		if (buf[intrface].ifr_flags & IFF_UP) {
		    puts("the interface status is UP");
		} else {
		    puts("the interface status is DOWN");
		}

/*Get IP of the net card */
		if (!(ioctl(fd, SIOCGIFADDR, (char *) &buf[intrface]))) {
		    puts("IP address is:");
		    puts(inet_ntoa
			 (((struct sockaddr_in *) (&buf[intrface].
						   ifr_addr))->sin_addr));
		    puts("");
//puts (buf[intrface].ifr_addr.sa_data);
		} else {
		    char str[256];

		    sprintf(str, "cpm: ioctl device %s",
			    buf[intrface].ifr_name);
		    perror(str);
		}

/*Get HW ADDRESS of the net card */
		if (!(ioctl(fd, SIOCGIFHWADDR, (char *) &buf[intrface]))) {
		    puts("HW address is:");

		    printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[0],
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[1],
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[2],
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[3],
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[4],
			   (unsigned char) buf[intrface].ifr_hwaddr.
			   sa_data[5]);

		    puts("");
		    puts("");
		}

		else {
		    char str[256];

		    sprintf(str, "cpm: ioctl device %s",
			    buf[intrface].ifr_name);
		    perror(str);
		}
	    }
	} else
	    perror("cpm: ioctl");

    } else
	perror("cpm: socket");

    close(fd);
    return retn;
}

我原来在中国linux论坛发过一个帖子，写法略有不同

/* Low level network programming in Linux using PF_PACKET

 * Need root privileges */

#include <stdio.h>

#include <sys/socket.h>

#include <sys/errno.h>

#include <linux/if.h>

#include <linux/if_ether.h>

#include <linux/if_arp.h>

#include <linux/sockios.h>

 
int main(int argc, char **argv)

{

    int i, sockfd;

    static struct ifreq req;

    struct sockaddr_ll inside_address;

 
    /* Low level socket */

    sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

    if (sockfd < 0) {

        perror("Unable to create low level socket: ");

        exit(1);

    }

    memset(&inside_address, 0, sizeof(inside_address));

    inside_address.sll_family = AF_PACKET;

    inside_address.sll_protocol = htons(ETH_P_ALL);

    inside_address.sll_hatype = ARPOP_REQUEST;

    inside_address.sll_pkttype = PACKET_BROADCAST;

    inside_address.sll_halen = 6;

    strcpy(req.ifr_name, "eth1");

    ioctl(sockfd, SIOCGIFINDEX, &req);

    inside_address.sll_ifindex = req.ifr_ifindex;

    ioctl(sockfd, SIOCGIFHWADDR, &req);

    if (bind(sockfd, (struct sockaddr *) &inside_address,

             sizeof(inside_address)) != 0) {

        perror("Error:");

        exit(1);

    }

    for (i = 0; i < 6; i++)

        inside_address.sll_addr[i] =

            (unsigned char) req.ifr_hwaddr.sa_data[i];

    printf("%X\n", inside_address.sll_ifindex);

    for (i = 0; i < 5; i++) {

        printf("%02X", inside_address.sll_addr[i]);

        printf(":");

    }

    printf("%02X\n", inside_address.sll_addr[i]);

    close(sockfd);

    return 0;

}