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package dnssec
import (
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/request"
"github.com/miekg/dns"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/net/context"
)
// ServeDNS implements the middleware.Handler interface.
func (d Dnssec) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
state := request.Request{W: w, Req: r}
do := state.Do()
qname := state.Name()
qtype := state.QType()
zone := middleware.Zones(d.zones).Matches(qname)
if zone == "" {
return d.Next.ServeDNS(ctx, w, r)
}
// Intercept queries for DNSKEY, but only if one of the zones matches the qname, otherwise we let
// the query through.
if qtype == dns.TypeDNSKEY {
for _, z := range d.zones {
if qname == z {
resp := d.getDNSKEY(state, z, do)
resp.Authoritative = true
state.SizeAndDo(resp)
w.WriteMsg(resp)
return dns.RcodeSuccess, nil
}
}
}
drr := &ResponseWriter{w, d}
return d.Next.ServeDNS(ctx, drr, r)
}
var (
cacheSize = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "size_guage",
Help: "Gauge of number of elements in the cache.",
}, []string{"type"})
cacheCapacity = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: middleware.Namespace,
Subsystem: subsystem,
Name: "capacity_gauge",
Help: "Gauge of cache's capacity.",
}, []string{"type"})
)
// Name implements the Handler interface.
func (d Dnssec) Name() string { return "dnssec" }
const subsystem = "dnssec"
func init() {
prometheus.MustRegister(cacheSize)
prometheus.MustRegister(cacheCapacity)
}
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