OFFSET_AUTH
memcpy(data.data + OFFSET_AUTH, auth, AUTH_FIELD_SIZE);
input[0].data = make_data(pkt->pkt.data, OFFSET_AUTH);
if (buffer->length < OFFSET_AUTH)
return OFFSET_AUTH - buffer->length;
#define AUTH_FIELD_SIZE (OFFSET_ATTR - OFFSET_AUTH)
#define pkt_auth(p) ((uchar *)offset(&(p)->pkt, OFFSET_AUTH))