mirror of
https://github.com/coredns/coredns.git
synced 2025-10-30 01:34:21 -04:00
f58f1e4285
Allow specifying a primary server and retrieve the zone's content. Add tests and an Expired bool to zone struct, to stop server zones that are expired. The zone is retrieved on Startup, no updates of changed content are done. We also don't respond to notifies yet.
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
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 transfer 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]) // add closing SOA to the end
|
|
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.
|