+
+#ifdef INET6
+/*
+ * ether_to_eui64 - Convert 48-bit Ethernet address into 64-bit EUI
+ *
+ * convert the 48-bit MAC address of eth0 into EUI 64. caller also assumes
+ * that the system has a properly configured Ethernet interface for this
+ * function to return non-zero.
+ */
+int
+ether_to_eui64(eui64_t *p_eui64)
+{
+ struct ifreq ifr;
+ int skfd;
+ const unsigned char *ptr;
+
+ skfd = socket(PF_INET6, SOCK_DGRAM, 0);
+ if(skfd == -1)
+ {
+ warn("could not open IPv6 socket");
+ return 0;
+ }
+
+ strcpy(ifr.ifr_name, "eth0");
+ if(ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
+ {
+ close(skfd);
+ warn("could not obtain hardware address for eth0");
+ return 0;
+ }
+ close(skfd);
+
+ /*
+ * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
+ */
+ ptr = ifr.ifr_hwaddr.sa_data;
+ p_eui64->e8[0] = ptr[0] | 0x02;
+ p_eui64->e8[1] = ptr[1];
+ p_eui64->e8[2] = ptr[2];
+ p_eui64->e8[3] = 0xFF;
+ p_eui64->e8[4] = 0xFE;
+ p_eui64->e8[5] = ptr[3];
+ p_eui64->e8[6] = ptr[4];
+ p_eui64->e8[7] = ptr[5];
+
+ return 1;
+}
+#endif