get_mac.c

在Linux操作系统下实现的软件交换技术

/*
 * get_mac.c
 *
 * Return the MAC (ie, ethernet hardware) address by using system specific calls.
 */
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include "getmac_struct.h"

#define e0 "eth0"
#define e1 "eth1"
#define e2 "eth2"
#define e3 "eth3"

#define P printf

long get_mac( u_char *addr, int e)
{
    struct ifreq ifr;
    struct ifreq *IFR;
    struct ifconf ifc;
    char buf[1024];
    int s, i;
    int ok = 0;

    int eth;

    s = socket(AF_INET, SOCK_DGRAM, 0);
    if (s==-1) {
        return -1;
    }

    ifc.ifc_len = sizeof(buf);
    ifc.ifc_buf = buf;
    ioctl(s, SIOCGIFCONF, &ifc);

    IFR = ifc.ifc_req;
    for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; IFR++)
    {

        strcpy(ifr.ifr_name, IFR->ifr_name);

	switch (e)
	{
	case 0 :
		if(strcmp(ifr.ifr_name,e0)==0)
		{
		        if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0)
			{
	        	    if (! (ifr.ifr_flags & IFF_LOOPBACK))
		    		{
        	        		if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0)
					{
			    		ok = 1;
	                    		break;
	                		}
        	    		}
			}
		}

		break;
	case 1 :

		if(strcmp(ifr.ifr_name,e1)==0)
			{
		        	if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0)
				{
	        	    		if (! (ifr.ifr_flags & IFF_LOOPBACK))
		    			{
        	        			if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0)
						{
			    			ok = 1;
	                    			break;
	                			}
        	    			}
				}
			}
		break;
	case 2 :

		if(strcmp(ifr.ifr_name,e2)==0)
			{
		        	if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0)
				{
	        	    		if (! (ifr.ifr_flags & IFF_LOOPBACK))
		    			{
        	        			if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0)
						{
			    			ok = 1;
	                    			break;
	                			}
        	    			}
				}
			}
		break;
	case 3 :

		if(strcmp(ifr.ifr_name,e3)==0)
			{
		        	if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0)
				{
	        	    		if (! (ifr.ifr_flags & IFF_LOOPBACK))
		    			{
        	        			if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0)
						{
			    			ok = 1;
	                    			break;
	                			}
        	    			}
				}
			}
		break;

	}//end of switch
    }//end of for

    close(s);
    if (ok) {
        bcopy( ifr.ifr_hwaddr.sa_data, addr, 12);
    }
    else {
        return -1;
    }
    return 0;

}

//-----------------------------------------------------------
int  print_mac(u_char *addr, int e)
{
	int i;

   	printf( "MAC address of eth%d: = ",e);
       	for (i=0; i<6; ++i)
	{
            printf("%2.2x", addr[i]);
        }
        printf( "\n");
	return 0;
}
//----------------------------------------------------------
//Xay  dung module luu lai cac dia chi MAC vua lay duoc

void saveMac(u_char *addr,struct SwitchMac *a, int i)
{

bcopy(addr,a->s_mac[i].mac,6);
a->num_mac++;
}

//---------------------------------------------------------
print_saveMac(struct SwitchMac *a)
{
  int i,j,n;
n=a->num_mac;

printf("Save Mac:\n");

for(i=0;i<n;i++)
{
	 for (j=0; j<6; ++j)
	{
            printf("%2.2x", a->s_mac[i].mac[j]);
        }
        printf( "\n");
}
}
//=========================================================