// 利用ioctl獲取本機指定設備的MAC地址#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> #include<netinet/ip.h> #include<net/if_arp.h> #include<sys/sysctl.h>int main(int argc, char **argv) {struct sockaddr_in *addr;struct ifreq ifr;unsigned char *mac;char *address;int sockfd;if (argc < 2){printf("Usage : %s interface\n", argv[0]);return 1;}sockfd = socket(AF_INET, SOCK_DGRAM, 0);strncpy(ifr.ifr_name, argv[1], IFNAMSIZ - 1);if (ioctl(sockfd, SIOCGIFADDR, &ifr) == -1){perror("ioctl");exit(1);}addr = (struct sockaddr_in *)&(ifr.ifr_addr);address = inet_ntoa(addr->sin_addr);printf("inet addr: %s\n", address);if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) == -1){perror("ioctl error");exit(1);}mac = (unsigned char*)(ifr.ifr_hwaddr.sa_data);printf("mac address: %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", mac[0],mac[1],mac[2],mac[3],mac[4],mac[5]);printf("%d: [%s]----\n", strlen(mac), mac);return 0; }

運行結果：

[zcm@t #113]$make gcc -c -o a.o a.c gcc -o a a.o [zcm@t #114]$./a eth1 inet addr: 172.25.25.97 mac address: 00:0c:29:63:38:81 0: []---- [zcm@t #115]$./a eth0 ioctl: No such device [zcm@t #116]$

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