designed finalized
This commit is contained in:
parent
2c6eb05cf8
commit
c3b9e95d58
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@ -1,9 +1,9 @@
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package main
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package main
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import (
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import (
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"github.com/miekg/dns"
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"flag"
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"flag"
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"fmt"
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"fmt"
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"github.com/miekg/dns"
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"strings"
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"strings"
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"time"
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"time"
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)
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)
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@ -33,7 +33,11 @@ func main() {
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if t, e := client.XfrReceive(m, *nameserver); e == nil {
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if t, e := client.XfrReceive(m, *nameserver); e == nil {
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for r := range t {
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for r := range t {
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if r.Error == nil {
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if r.Error == nil {
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fmt.Printf("%v\n", r.Reply)
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for _, rr := range r.Reply {
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fmt.Printf("%v\n", rr)
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}
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} else {
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fmt.Printf("error: %s\n", r.Error.Error())
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}
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}
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}
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}
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} else {
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} else {
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74
xfr.go
74
xfr.go
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@ -1,16 +1,17 @@
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package dns
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package dns
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import (
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import (
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"net"
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"time"
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"time"
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)
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)
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// TODO: axfrreceive fixen, first can go
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// a tsigTimersonly to responsewriter
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// XfrMsg is used when doing [IA]xfr with a remote server.
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// XfrMsg is used when doing [IA]xfr with a remote server.
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type XfrMsg struct {
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type XfrMsg struct {
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Reply []RR // the set of RRs in the answer section form the message of the server
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RR []RR // the set of RRs in the answer section form the message of the server
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Rtt time.Duration // round trip time
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Rtt time.Duration // round trip time
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RemoteAddr net.Addr // address of the server
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Error error // if something went wrong, this contains the error
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Error error // if something went wrong, this contains the error
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}
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}
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// XfrReceive performs a [AI]xfr request (depends on the message's Qtype). It returns
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// XfrReceive performs a [AI]xfr request (depends on the message's Qtype). It returns
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@ -22,10 +23,10 @@ type XfrMsg struct {
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//
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//
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// Basic use pattern for receiving an AXFR:
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// Basic use pattern for receiving an AXFR:
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//
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//
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// // m contains the [AI]xfr request
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// // m contains the AXFR request
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// t, e := client.XfrReceive(m, "127.0.0.1:53")
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// t, e := client.XfrReceive(m, "127.0.0.1:53")
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// for r := range t {
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// for r := range t {
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// // ... deal with r.Reply or r.Error
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// // ... deal with r.RR or r.Error
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// }
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// }
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func (c *Client) XfrReceive(q *Msg, a string) (chan *XfrMsg, error) {
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func (c *Client) XfrReceive(q *Msg, a string) (chan *XfrMsg, error) {
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w := new(reply)
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w := new(reply)
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@ -59,16 +60,16 @@ func (w *reply) axfrReceive(c chan *XfrMsg) {
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for {
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for {
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in, err := w.receive()
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in, err := w.receive()
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if err != nil {
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if err != nil {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: err}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: err}
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return
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return
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}
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}
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if w.req.Id != in.Id {
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if w.req.Id != in.Id {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: ErrId}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: ErrId}
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return
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return
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}
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}
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if first {
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if first {
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if !checkXfrSOA(in, true) {
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if !checkXfrSOA(in, true) {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: ErrXfrSoa}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: ErrXfrSoa}
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return
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return
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}
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}
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first = !first
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first = !first
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if !first {
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if !first {
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w.tsigTimersOnly = true // Subsequent envelopes use this.
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w.tsigTimersOnly = true // Subsequent envelopes use this.
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if checkXfrSOA(in, false) {
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if checkXfrSOA(in, false) {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: nil}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: nil}
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return
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return
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}
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}
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: nil}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: nil}
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}
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}
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}
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}
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panic("not reached")
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panic("not reached")
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@ -94,23 +95,23 @@ func (w *reply) ixfrReceive(c chan *XfrMsg) {
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for {
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for {
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in, err := w.receive()
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in, err := w.receive()
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if err != nil {
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if err != nil {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: err}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: err}
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return
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return
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}
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}
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if w.req.Id != in.Id {
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if w.req.Id != in.Id {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: ErrId}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: ErrId}
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return
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return
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}
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}
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if first {
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if first {
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// A single SOA RR signals "no changes"
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// A single SOA RR signals "no changes"
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if len(in.Answer) == 1 && checkXfrSOA(in, true) {
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if len(in.Answer) == 1 && checkXfrSOA(in, true) {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: nil}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: nil}
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return
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return
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}
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}
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// Check if the returned answer is ok
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// Check if the returned answer is ok
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if !checkXfrSOA(in, true) {
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if !checkXfrSOA(in, true) {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: ErrXfrSoa}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: ErrXfrSoa}
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return
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return
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}
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}
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// This serial is important
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// This serial is important
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// If the last record in the IXFR contains the servers' SOA, we should quit
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// If the last record in the IXFR contains the servers' SOA, we should quit
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if v, ok := in.Answer[len(in.Answer)-1].(*RR_SOA); ok {
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if v, ok := in.Answer[len(in.Answer)-1].(*RR_SOA); ok {
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if v.Serial == serial {
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if v.Serial == serial {
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt, Error: nil}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt, Error: nil}
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return
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return
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}
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}
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}
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}
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c <- &XfrMsg{Reply: in.Answer, Rtt: w.rtt}
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c <- &XfrMsg{RR: in.Answer, Rtt: w.rtt}
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}
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}
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}
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}
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panic("not reached")
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panic("not reached")
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}
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}
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// XfrSend performs an outgoing Ixfr or Axfr. The function is [AI]xfr agnostic, it is
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// XfrSend performs an outgoing [IX]xfr depending on the request message. As
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// up to the caller to correctly send the sequence of messages.
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// long as the channel c is open ... TODO(mg): docs
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func XfrSend(w ResponseWriter, q *Msg, a string) error {
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// tsig is done, enveloping is done, voor de rest niks... TODO
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switch q.Question[0].Qtype {
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func XfrSend(w ResponseWriter, req *Msg, c chan *XfrMsg) error {
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switch req.Question[0].Qtype {
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case TypeAXFR, TypeIXFR:
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case TypeAXFR, TypeIXFR:
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// go d.xfrWrite(q, m, e)
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go axfrSend(w, req, c)
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default:
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default:
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return ErrXfrType
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return ErrXfrType
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}
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}
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return nil
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return nil
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}
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}
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func axfrSend(w ResponseWriter, req *Msg, c chan *XfrMsg) {
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rep := new(Msg)
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rep.SetReply(req)
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rep.MsgHdr.Authoritative = true
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w.tsigTimersOnly = false
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for x := range c {
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// assume is fits
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rep.Answer = append(rep.Answer, x.RR...)
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w.Write(rep)
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if !w.tsigTimersOnly {
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w.tsigTimersOnly = !w.tsigTimersOnly
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}
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rep.Answer = nil
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}
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}
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/*
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/*
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// Just send the zone
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func (d *Conn) axfrSend(q *Msg, m chan *Xfr, e chan os.Error) {
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out := new(Msg)
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out.Id = q.Id
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out.Question = q.Question
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out.Answer = make([]RR, 1001) // TODO(mg) look at this number
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out.MsgHdr.Response = true
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out.MsgHdr.Authoritative = true
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first := true
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var soa *RR_SOA
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var soa *RR_SOA
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i := 0
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i := 0
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for r := range m {
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for r := range m {
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