Code:
/**
*
* input : IP addresa od interfejsa (ista mreza)
* output : MAC addresa ovog interfejsa ako je nadjena
*
* Testirano na Debian-u...
*/
#include <stdlib.h>
#include <stdio.h>
#include <net/if_arp.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char *argv[])
{
struct sockaddr_in sin = { 0 };
struct arpreq myarp = { { 0 } };
int sockfd;
unsigned char *ptr;
if(argc!=2) {
printf("Kako koristiti program: %s <IP addresa>\n",argv[0]);
exit(0);
}
sin.sin_family = AF_INET;
if(inet_aton(argv[1], &sin.sin_addr)==0) {
printf("%s: IP addresa '%s' nije validna\n",argv[0],argv[1]);
exit(0);
}
memcpy(&myarp.arp_pa, &sin, sizeof myarp.arp_pa);
strcpy(myarp.arp_dev, "eth0");
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
printf("%s: ne mogu da otvorim socket\n",argv[0]);
exit(0);
}
if (ioctl(sockfd, SIOCGARP, &myarp) == -1) {
printf("%s: nema podatka u arp_cache-u za '%s'\n",argv[0],argv[1]);
exit(0);
}
ptr = &myarp.arp_ha.sa_data[0];
printf("%s: MAC addresa za '%s' je : ",argv[0],argv[1]);
printf("%x:%x:%x:%x:%x:%x\n",*ptr, *(ptr+1),*(ptr+2),
*(ptr+3),*(ptr+4),*(ptr+5));
return 1;
}
Dejan Lekic
software engineer, MySQL/PgSQL DBA, sysadmin
MAC adrese
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