获取指定名字的网卡的Mac地址和IP地址

文件名：get_mac_ip.c
运行环境：Linux、Arm
编译指令：gcc -o get_mac_ip get_mac_ip.c
运行程序：./get_mac_ip eth0 其中eth0是网卡的名字，不同网卡名字一般是不一样的。

// 文件名：get_ip_mac.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h> 
#include <arpa/inet.h>

int get_mac_addr(char* mac, char* ip, char *_net_card)
{
	struct ifreq tmp;
	int sock_mac;
	char mac_addr[30];
	struct sockaddr_in *sin;
	sock_mac = socket(AF_INET, SOCK_STREAM, 0);
	if(sock_mac == -1)
	{
		perror("create socket fail\n");
		return -1;
	}
	memset(&tmp,0,sizeof(tmp));
	strncpy(tmp.ifr_name, _net_card, sizeof(tmp.ifr_name)-1 );
	if(ioctl(sock_mac, SIOCGIFHWADDR, &tmp)<0)
	{
		printf("mac ioctl error\n");
		close(sock_mac);
		return -1;
	}
	sprintf(mac_addr, "%02x:%02x:%02x:%02x:%02x:%02x",
		(unsigned char)tmp.ifr_hwaddr.sa_data[0],
		(unsigned char)tmp.ifr_hwaddr.sa_data[1],
		(unsigned char)tmp.ifr_hwaddr.sa_data[2],
		(unsigned char)tmp.ifr_hwaddr.sa_data[3],
		(unsigned char)tmp.ifr_hwaddr.sa_data[4],
		(unsigned char)tmp.ifr_hwaddr.sa_data[5]);
	memcpy(mac, mac_addr, strlen(mac_addr));
	// printf("local mac:%s\n", mac_addr);
	if(ioctl(sock_mac, SIOCGIFADDR, &tmp) < 0)
	{
		close(sock_mac);
		return -1;
	}
	sin = (struct sockaddr_in *)&(tmp.ifr_addr);
	strcpy(ip, inet_ntoa(sin->sin_addr));
	close(sock_mac);
	return 0;
}

int main(int argc, char** argv)
{
    char mac[32] = "\0";
    char ip[32]="\0";
    if(argc < 2)
    {
        printf("Sorry. Please input net card name.\n");
		printf("Such as: ./get_ip_mac eth0\n");
        return 0;
    }
    get_mac_addr(mac, ip, argv[1]);
    printf("mac=%s\nip=%s\n", mac, ip);
    return 0;
}