学步园

#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char* argv[])
{
		if(argc < 2)
			printf("usage getmac  <interface>   interface为网络设备，如eth0, 可以通过/sbin/ifconfig查看\n"),exit(-1);
		/*
		struct ifreq {
  union {
    char    ifrn_name[IFNAMSIZ];    Unique Windows Adapter name (A GUID) 
  } ifr_ifrn;
		*/
    struct ifreq req;
    int sock;
    char mac[32];
    if((sock=socket(AF_INET,SOCK_STREAM,0))< 0)
    {
        printf("error socket\n");
        return 2;
    }

	  //#define SIOCGIFHWADDR   0x8927          /* Get hardware address         */
    strcpy(req.ifr_name,argv[1]);
    if(ioctl(sock,SIOCGIFHWADDR,&req) < 0)
    {
        printf("error ioctl SIOCGIFHWADDR\n");
        return 3;
    }

    unsigned char* macArr= (unsigned char*)req.ifr_hwaddr.sa_data;
    sprintf(mac, "%02x-%02x-%02x-%02x-%02x-%02x", macArr[0],macArr[1],macArr[2],macArr[3],macArr[4],macArr[5]);
    printf("MAC:%s\n",mac);
    
    
    struct ifreq req2;
    strcpy(req2.ifr_name,argv[1]);
    //#define SIOCGIFADDR     0x8915          /* get PA address               */
    //获取IO设备的更多信息见/usr/include/bits/ioctls.h
    if(ioctl(sock, SIOCGIFADDR,&req2) < 0)
    {
        printf("error ioctl SIGCGIFADDR\n");
        return 4;
    }
    char ipAddr[64] = {0}; 
    inet_ntop(AF_INET,&((struct sockaddr_in*)&(req2.ifr_addr))->sin_addr, ipAddr,sizeof(ipAddr));
   	printf("IPADDR %s\n", ipAddr);
    return 0;
}