diff options
Diffstat (limited to 'vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/xfr.go')
| -rw-r--r-- | vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/xfr.go | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/xfr.go b/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/xfr.go deleted file mode 100644 index 576c5590a..000000000 --- a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/xfr.go +++ /dev/null @@ -1,255 +0,0 @@ -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>]<base64 secret>, zonename must be fully qualified - 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) { - 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) - go func() { - if q.Question[0].Qtype == TypeAXFR { - go t.inAxfr(q.Id, env) - return - } - if q.Question[0].Qtype == TypeIXFR { - go t.inIxfr(q.Id, env) - return - } - }() - return env, nil -} - -func (t *Transfer) inAxfr(id uint16, 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 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(id uint16, c chan *Envelope) { - serial := uint32(0) // The first serial seen is the current server serial - first := true - 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 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 - } - // A single SOA RR signals "no changes" - if len(in.Answer) == 1 && isSOAFirst(in) { - c <- &Envelope{in.Answer, nil} - return - } - - // 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 - first = !first - } - - // Now we need to check each message for SOA records, to see what we need to do - if !first { - t.tsigTimersOnly = true - // If the last record in the IXFR contains the servers' SOA, we should quit - if v, ok := in.Answer[len(in.Answer)-1].(*SOA); ok { - if v.Serial == serial { - c <- &Envelope{in.Answer, nil} - return - } - } - 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) -// go tr.Out(w, r, ch) -// ch <- &dns.Envelope{RR: []dns.RR{soa, rr1, rr2, rr3, soa}} -// close(ch) -// w.Hijack() -// // w.Close() // Client closes 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 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 - } - if _, err = t.Write(out); err != nil { - return err - } - return nil -} - -func isSOAFirst(in *Msg) bool { - if len(in.Answer) > 0 { - return in.Answer[0].Header().Rrtype == TypeSOA - } - return false -} - -func isSOALast(in *Msg) bool { - if len(in.Answer) > 0 { - return in.Answer[len(in.Answer)-1].Header().Rrtype == TypeSOA - } - return false -} - -const errXFR = "bad xfr rcode: %d" |