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package dns import ( "fmt" "time" ) // Envelope is used when doing a zone transfer with a remote server. type Envelope struct { RR []RR // The set of RRs in the answer section of the xfr reply message. Error error // If something went wrong, this contains the error. } // A Transfer defines parameters that are used during a zone transfer. type Transfer struct { *Conn DialTimeout time.Duration // net.DialTimeout, defaults to 2 seconds ReadTimeout time.Duration // net.Conn.SetReadTimeout value for connections, defaults to 2 seconds WriteTimeout time.Duration // net.Conn.SetWriteTimeout value for connections, defaults to 2 seconds TsigSecret map[string]string // Secret(s) for Tsig map[], zonename must be in canonical form (lowercase, fqdn, see RFC 4034 Section 6.2) tsigTimersOnly bool } // Think we need to away to stop the transfer // In performs an incoming transfer with the server in a. // If you would like to set the source IP, or some other attribute // of a Dialer for a Transfer, you can do so by specifying the attributes // in the Transfer.Conn: // // d := net.Dialer{LocalAddr: transfer_source} // con, err := d.Dial("tcp", master) // dnscon := &dns.Conn{Conn:con} // transfer = &dns.Transfer{Conn: dnscon} // channel, err := transfer.In(message, master) // func (t *Transfer) In(q *Msg, a string) (env chan *Envelope, err error) { switch q.Question[0].Qtype { case TypeAXFR, TypeIXFR: default: return nil, &Error{"unsupported question type"} } timeout := dnsTimeout if t.DialTimeout != 0 { timeout = t.DialTimeout } if t.Conn == nil { t.Conn, err = DialTimeout("tcp", a, timeout) if err != nil { return nil, err } } if err := t.WriteMsg(q); err != nil { return nil, err } env = make(chan *Envelope) switch q.Question[0].Qtype { case TypeAXFR: go t.inAxfr(q, env) case TypeIXFR: go t.inIxfr(q, env) } return env, nil } func (t *Transfer) inAxfr(q *Msg, c chan *Envelope) { first := true defer t.Close() defer close(c) timeout := dnsTimeout if t.ReadTimeout != 0 { timeout = t.ReadTimeout } for { t.Conn.SetReadDeadline(time.Now().Add(timeout)) in, err := t.ReadMsg() if err != nil { c <- &Envelope{nil, err} return } if q.Id != in.Id { c <- &Envelope{in.Answer, ErrId} return } if first { if in.Rcode != RcodeSuccess { c <- &Envelope{in.Answer, &Error{err: fmt.Sprintf(errXFR, in.Rcode)}} return } if !isSOAFirst(in) { c <- &Envelope{in.Answer, ErrSoa} return } first = !first // only one answer that is SOA, receive more if len(in.Answer) == 1 { t.tsigTimersOnly = true c <- &Envelope{in.Answer, nil} continue } } if !first { t.tsigTimersOnly = true // Subsequent envelopes use this. if isSOALast(in) { c <- &Envelope{in.Answer, nil} return } c <- &Envelope{in.Answer, nil} } } } func (t *Transfer) inIxfr(q *Msg, c chan *Envelope) { var serial uint32 // The first serial seen is the current server serial axfr := true n := 0 qser := q.Ns[0].(*SOA).Serial defer t.Close() defer close(c) timeout := dnsTimeout if t.ReadTimeout != 0 { timeout = t.ReadTimeout } for { t.SetReadDeadline(time.Now().Add(timeout)) in, err := t.ReadMsg() if err != nil { c <- &Envelope{nil, err} return } if q.Id != in.Id { c <- &Envelope{in.Answer, ErrId} return } if in.Rcode != RcodeSuccess { c <- &Envelope{in.Answer, &Error{err: fmt.Sprintf(errXFR, in.Rcode)}} return } if n == 0 { // Check if the returned answer is ok if !isSOAFirst(in) { c <- &Envelope{in.Answer, ErrSoa} return } // This serial is important serial = in.Answer[0].(*SOA).Serial // Check if there are no changes in zone if qser >= serial { c <- &Envelope{in.Answer, nil} return } } // Now we need to check each message for SOA records, to see what we need to do t.tsigTimersOnly = true for _, rr := range in.Answer { if v, ok := rr.(*SOA); ok { if v.Serial == serial { n++ // quit if it's a full axfr or the the servers' SOA is repeated the third time if axfr && n == 2 || n == 3 { c <- &Envelope{in.Answer, nil} return } } else if axfr { // it's an ixfr axfr = false } } } c <- &Envelope{in.Answer, nil} } } // Out performs an outgoing transfer with the client connecting in w. // Basic use pattern: // // ch := make(chan *dns.Envelope) // tr := new(dns.Transfer) // var wg sync.WaitGroup // go func() { // tr.Out(w, r, ch) // wg.Done() // }() // ch <- &dns.Envelope{RR: []dns.RR{soa, rr1, rr2, rr3, soa}} // close(ch) // wg.Wait() // wait until everything is written out // w.Close() // close connection // // The server is responsible for sending the correct sequence of RRs through the channel ch. func (t *Transfer) Out(w ResponseWriter, q *Msg, ch chan *Envelope) error { for x := range ch { r := new(Msg) // Compress? r.SetReply(q) r.Authoritative = true // assume it fits TODO(miek): fix r.Answer = append(r.Answer, x.RR...) if tsig := q.IsTsig(); tsig != nil && w.TsigStatus() == nil { r.SetTsig(tsig.Hdr.Name, tsig.Algorithm, tsig.Fudge, time.Now().Unix()) } if err := w.WriteMsg(r); err != nil { return err } w.TsigTimersOnly(true) } return nil } // ReadMsg reads a message from the transfer connection t. func (t *Transfer) ReadMsg() (*Msg, error) { m := new(Msg) p := make([]byte, MaxMsgSize) n, err := t.Read(p) if err != nil && n == 0 { return nil, err } p = p[:n] if err := m.Unpack(p); err != nil { return nil, err } if ts := m.IsTsig(); ts != nil && t.TsigSecret != nil { if _, ok := t.TsigSecret[ts.Hdr.Name]; !ok { return m, ErrSecret } // Need to work on the original message p, as that was used to calculate the tsig. err = TsigVerify(p, t.TsigSecret[ts.Hdr.Name], t.tsigRequestMAC, t.tsigTimersOnly) t.tsigRequestMAC = ts.MAC } return m, err } // WriteMsg writes a message through the transfer connection t. func (t *Transfer) WriteMsg(m *Msg) (err error) { var out []byte if ts := m.IsTsig(); ts != nil && t.TsigSecret != nil { if _, ok := t.TsigSecret[ts.Hdr.Name]; !ok { return ErrSecret } out, t.tsigRequestMAC, err = TsigGenerate(m, t.TsigSecret[ts.Hdr.Name], t.tsigRequestMAC, t.tsigTimersOnly) } else { out, err = m.Pack() } if err != nil { return err } _, err = t.Write(out) return err } func isSOAFirst(in *Msg) bool { return len(in.Answer) > 0 && in.Answer[0].Header().Rrtype == TypeSOA } func isSOALast(in *Msg) bool { return len(in.Answer) > 0 && in.Answer[len(in.Answer)-1].Header().Rrtype == TypeSOA } const errXFR = "bad xfr rcode: %d"