Qualify IPv6 link-local DNS servers with an interface name

            SLOGE("Invalid optlen %d for RDNSS option\n", optlen);

            return false;

        }

        int numaddrs = (optlen - 1) / 2;

        const int numaddrs = (optlen - 1) / 2;

        // Find the lifetime.

        struct nd_opt_rdnss *rndss_opt = (struct nd_opt_rdnss *) opthdr;

        uint32_t lifetime = ntohl(rndss_opt->nd_opt_rdnss_lifetime);

        const uint32_t lifetime = ntohl(rndss_opt->nd_opt_rdnss_lifetime);

        // Construct "SERVERS=<comma-separated string of DNS addresses>".

        // Reserve (INET6_ADDRSTRLEN + 1) chars for each address: all but the

        // the last address are followed by ','; the last is followed by '\0'.

        static const char kServerTag[] = "SERVERS=";

        static const int kTagLength = sizeof(kServerTag) - 1;

        int bufsize = kTagLength + numaddrs * (INET6_ADDRSTRLEN + 1);

        static const int kTagLength = strlen(kServerTag);

        // Reserve sufficient space for an IPv6 link-local address: all but the

        // last address are followed by ','; the last is followed by '\0'.

        static const int kMaxSingleAddressLength =

                INET6_ADDRSTRLEN + strlen("%") + IFNAMSIZ + strlen(",");

        const int bufsize = kTagLength + numaddrs * (INET6_ADDRSTRLEN + 1);

        char *buf = (char *) malloc(bufsize);

        if (!buf) {

            SLOGE("RDNSS option: out of memory\n");

            }

            inet_ntop(AF_INET6, addrs + i, buf + pos, bufsize - pos);

            pos += strlen(buf + pos);

            if (IN6_IS_ADDR_LINKLOCAL(addrs + i)) {

                buf[pos++] = '%';

                pos += strlcpy(buf + pos, ifname, bufsize - pos);

            }

        }

        buf[pos] = '\0';