## page was renamed from djbdns/dnscache/query.c/referral
## page was renamed from DNS/実装/djbdns/dnscache/query.c/referral
## page was renamed from DNS/dnscache/query.c/referral
DNS/dnscache/query.c/referralについて、ここに記述してください。

referral だと判断したら、authority section NSを抜きだし保存して、それらに対してqueryを送る。
　(毒の可能性を考慮するならば、NSを問い合せ直すのがよい。）　-- ToshinoriMaeno <<DateTime(2015-09-23T00:23:05+0900)>>

{{{
  if (!dns_domain_suffix(d,referral)) goto DIE;
  control = d + dns_domain_suffixpos(d,referral);
  z->control[z->level] = control;
  byte_zero(z->servers[z->level],64);
  for (j = 0;j < QUERY_MAXNS;++j)
    dns_domain_free(&z->ns[z->level][j]);
  k = 0;
      
  pos = posauthority;
  for (j = 0;j < numauthority;++j) {
    pos = dns_packet_getname(buf,len,pos,&t1); if (!pos) goto DIE;
    pos = dns_packet_copy(buf,len,pos,header,10); if (!pos) goto DIE;
    uint16_unpack_big(header + 8,&datalen);
    if (dns_domain_equal(referral,t1)) /* should always be true */
      if (typematch(header,DNS_T_NS)) /* should always be true */
        if (byte_equal(header + 2,2,DNS_C_IN)) /* should always be true */
          if (k < QUERY_MAXNS)
            if (!dns_packet_getname(buf,len,pos,&z->ns[z->level][k++])) goto DIE;
    pos += datalen;
  }

  goto HAVENS;
}}}