Example #1
0
func parseQuery(m *dns.Msg) {
	var rr dns.RR
	for _, q := range m.Question {
		if read_rr, e := getRecord(q.Name, q.Qtype); e == nil {
			rr = read_rr.(dns.RR)
			if rr.Header().Name == q.Name {
				m.Answer = append(m.Answer, rr)
			}
		} else {
			m2 := new(dns.Msg)
			if q.Qtype == dns.TypeA {
				m2.SetQuestion(q.Name, dns.TypeA)
			} else {
				m2.Question = make([]dns.Question, 1)
				m2.Question[0] = q
			}
			ret := queryUpStream(m2)
			if ret != nil {
				if q.Qtype == dns.TypeA {
					for _, r := range ret.Answer {
						// fmt.Printf("%s\n", r)
						if *cache {
							storeRecord(r) //FIXME: only be able to save one record
						}
						tmp := strings.Split(r.String(), "	")
						if len(tmp) > 2 && tmp[len(tmp)-2] == "A" {
							fmt.Printf("%s\n", tmp[len(tmp)-1])
						}
					}
				}
				m.Answer = append(m.Answer, ret.Answer...)
			}
		}
	}
}
Example #2
0
func updateRecord(r dns.RR, q *dns.Question) {
	var (
		rr    dns.RR
		name  string
		rtype uint16
		ttl   uint32
		ip    net.IP
	)

	header := r.Header()
	name = header.Name
	rtype = header.Rrtype
	ttl = header.Ttl

	if _, ok := dns.IsDomainName(name); ok {
		if header.Class == dns.ClassANY && header.Rdlength == 0 { // Delete record
			deleteRecord(name, rtype)
		} else { // Add record
			rheader := dns.RR_Header{
				Name:   name,
				Rrtype: rtype,
				Class:  dns.ClassINET,
				Ttl:    ttl,
			}

			if a, ok := r.(*dns.A); ok {
				rrr, err := getRecord(name, rtype)
				if err == nil {
					rr = rrr.(*dns.A)
				} else {
					rr = new(dns.A)
				}

				ip = a.A
				rr.(*dns.A).Hdr = rheader
				rr.(*dns.A).A = ip
			} else if a, ok := r.(*dns.AAAA); ok {
				rrr, err := getRecord(name, rtype)
				if err == nil {
					rr = rrr.(*dns.AAAA)
				} else {
					rr = new(dns.AAAA)
				}

				ip = a.AAAA
				rr.(*dns.AAAA).Hdr = rheader
				rr.(*dns.AAAA).AAAA = ip
			}

			storeRecord(rr)
		}
	}
}
Example #3
0
func storeRecord(rr dns.RR) (err error) {
	key, _ := getKey(rr.Header().Name, rr.Header().Rrtype)
	err = bdb.Update(func(tx *bolt.Tx) error {
		b := tx.Bucket([]byte(rr_bucket))
		err := b.Put([]byte(key), []byte(rr.String()))

		if err != nil {
			e := errors.New("Store record failed: " + rr.String())
			log.Println(e.Error())

			return e
		}

		return nil
	})

	return err
}