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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
package file
import (
"io"
"log"
"github.com/miekg/coredns/middleware"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
type (
File struct {
Next middleware.Handler
Zones Zones
}
Zones struct {
Z map[string]*Zone
Names []string
}
)
func (f File) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := middleware.State{W: w, Req: r}
qname := state.Name()
zone := middleware.Zones(f.Zones.Names).Matches(qname)
if zone == "" {
return f.Next.ServeDNS(ctx, w, r)
}
z, ok := f.Zones.Z[zone]
if !ok {
return f.Next.ServeDNS(ctx, w, r)
}
if state.Proto() != "udp" && state.QType() == dns.TypeAXFR {
xfr := Xfr{z}
return xfr.ServeDNS(ctx, w, r)
}
rrs, extra, result := z.Lookup(qname, state.QType(), state.Do())
m := new(dns.Msg)
m.SetReply(r)
m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
switch result {
case Success:
// case?
m.Answer = rrs
m.Extra = extra
// Ns section
case NameError:
m.Rcode = dns.RcodeNameError
fallthrough
case NoData:
// case?
m.Ns = rrs
default:
// TODO
}
m, _ = state.Scrub(m)
w.WriteMsg(m)
return dns.RcodeSuccess, nil
}
// Parse parses the zone in filename and returns a new Zone or an error.
func Parse(f io.Reader, origin, fileName string) (*Zone, error) {
tokens := dns.ParseZone(f, dns.Fqdn(origin), fileName)
z := NewZone(origin)
for x := range tokens {
if x.Error != nil {
log.Printf("[ERROR] failed to parse %s: %v", origin, x.Error)
return nil, x.Error
}
if x.RR.Header().Rrtype == dns.TypeSOA {
z.SOA = x.RR.(*dns.SOA)
continue
}
z.Insert(x.RR)
}
return z, nil
}
|
