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http://blog.csdn.net/suiyuan19840208/article/details/8483026 2013 #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("usage: %s <IP address>\n",argv[0]); exit(0); } sin.sin_family = AF_INET; if(inet_aton(argv[1], &sin.sin_addr)==0) { printf("%s: IP address '%s' not valid\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: cannot open socket\n",argv[0]); exit(0); } if (ioctl(sockfd, SIOCGARP, &myarp) == -1) { printf("%s: no entry in arp_cache for '%s'\n",argv[0],argv[1]); exit(0); } ptr = &myarp.arp_ha.sa_data[0]; printf("%s: MAC address for '%s' is : ",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; } [root@mini /test]$./getMAC 192.168.1.100 [root@mini /test]$./getMAC 192.168.1.1
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