SIOCGIFHWADDR not working.... :(

This is a discussion on SIOCGIFHWADDR not working.... :( within the Linux Programming forums, part of the Platform Specific Boards category; Code: int getmacaddress(char* dev, unsigned char *ipmac); int main() { int mac; unsigned char dot_not_mac[25]; mac=getmacaddress("eth0",dot_not_mac); printf(" the MAC address ...

  1. #1
    Registered User
    Join Date
    Oct 2006
    Posts
    22

    SIOCGIFHWADDR not working.... :(

    Code:
    int getmacaddress(char* dev, unsigned char *ipmac);
    
    int main()
    {
        int mac;
        unsigned char dot_not_mac[25];
        mac=getmacaddress("eth0",dot_not_mac);
        printf(" the MAC address is %s\n",dot_not_mac);
        return 0;
    }
    
    int getmacaddress(char* dev,unsigned char *ipmac)
    {
    	int skfd=0;
    	struct ifreq ifr;
    
    	strcpy(ifr.ifr_name,dev);
    	skfd = socket(AF_INET,SOCK_DGRAM,0);
    	if(skfd<0)
    	{
    		DEBUG1("Can't open socket!\n");
    		return -1;
    	}
    	if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
    	{
    		DEBUG1("Can't read local mac address!\n");
    		return -1;
    	}
    
    	memcpy(ipmac,ifr.ifr_hwaddr.sa_data,6);
          	close(skfd);
    	return 0;
    }
    the output of the code is as below....
    the MAC address is

    can anyone tell me what is wrong with this code... this code is not working...it is not printing MAC address.... please help me..
    thanks..

  2. #2
    and the hat of wrongness Salem's Avatar
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    > memcpy(ipmac,ifr.ifr_hwaddr.sa_data,6);
    Because this is 6 raw bytes, not a printable string.
    Code:
    unsigned char *p = ifr.ifr_hwaddr.sa_data;
    sprintf( ipmac, "&#37;02x:%02x:%02x:%02x:%02x:%02x",
             p[0], p[1], p[2], p[3], p[4], p[5] );
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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