macaddress, C (gcc)

macaddress

int
get_mac_address(char *ifaddr_name)
{
	char buf[1024];

int sock	= socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
	int success	= 0;

struct ifreq	ifr;
	struct ifconf	ifc;

if (sock == -1) { /* TODO Handle Error! */ }

ifc.ifc_len = sizeof(buf);
	ifc.ifc_buf = buf;
	
	if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) { /* TODO Handle Error! */ }

struct ifreq* it = ifc.ifc_req;
	const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));

for (; it != end; ++it)
	{
		strcpy(ifr.ifr_name, it->ifr_name);

/*
		 * Was done this way to reduce nesting.
		 */
		if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) { /* TODO Handle Error! */ continue; }
		if ((ifr.ifr_flags & IFF_LOOPBACK)) { /* TODO Handle Error! */ continue; }
		if (ioctl(sock, SIOCGIFHWADDR, &ifr) != 0) { /* TODO Handle Error! */ continue; }
		
		success = 1;
		break;
	}

unsigned char mac_address[6];

if (success) { memcpy(mac_address, ifr.ifr_hwaddr.sa_data, 6); }

printf("%s\n", mac_address);

int i;
	for (i = 0; i < 6; i++)
	{
		if (i > 0) { printf(":"); }
		printf("%02X", buf[i]);
	}

return 0;
}


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