+static char *index2addr(int index)
+{
+ struct ifreq ifr;
+ struct ether_addr *eth;
+ char *str;
+ int sk, err;
+
+ if (index < 0)
+ return NULL;
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0)
+ return NULL;
+
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_ifindex = index;
+
+ err = ioctl(sk, SIOCGIFNAME, &ifr);
+
+ if (err == 0)
+ err = ioctl(sk, SIOCGIFHWADDR, &ifr);
+
+ close(sk);
+
+ if (err < 0)
+ return NULL;
+
+ str = malloc(18);
+ if (!str)
+ return NULL;
+
+ eth = (void *) &ifr.ifr_hwaddr.sa_data;
+ snprintf(str, 18, "%02X:%02X:%02X:%02X:%02X:%02X",
+ eth->ether_addr_octet[0],
+ eth->ether_addr_octet[1],
+ eth->ether_addr_octet[2],
+ eth->ether_addr_octet[3],
+ eth->ether_addr_octet[4],
+ eth->ether_addr_octet[5]);
+
+ return str;
+}
+