OPT_RDATA
if (!buffer_available(packet, (OPT_LEN + OPT_RDATA)))
: (OPT_LEN + OPT_RDATA + edns->opt_reserved_space);
unsigned char rdata_none[OPT_RDATA];
OPT_RDATA) {
buffer_write(q->packet, edns->rdata_none, OPT_RDATA);
buffer_write(q->packet, edns->rdata_none, OPT_RDATA);