1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
package file
import (
"fmt"
"github.com/miekg/coredns/middleware"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
type (
Xfr struct {
*Zone
}
)
// Serve an AXFR (or maybe later an IXFR) as well.
func (x Xfr) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := middleware.State{W: w, Req: r}
if !x.TransferAllowed(state) {
return dns.RcodeServerFailure, nil
}
if state.QType() != dns.TypeAXFR {
return 0, fmt.Errorf("file: xfr called with non xfr type: %d", state.QType())
}
if state.Proto() == "udp" {
return 0, fmt.Errorf("file: xfr called with udp")
}
records := x.All()
if len(records) == 0 {
return dns.RcodeServerFailure, nil
}
ch := make(chan *dns.Envelope)
defer close(ch)
tr := new(dns.Transfer)
go tr.Out(w, r, ch)
j, l := 0, 0
records = append(records, records[0])
for i, r := range records {
l += dns.Len(r)
if l > transferLength {
ch <- &dns.Envelope{RR: records[j:i]}
l = 0
j = i
}
}
if j < len(records) {
ch <- &dns.Envelope{RR: records[j:]}
}
w.Hijack()
// w.Close() // Client closes connection
return dns.RcodeSuccess, nil
}
//const transferLength = 10e3 // Start a new envelop after message reaches this size.
const transferLength = 100 // Start a new envelop after message reaches this size.
|
