9546b606cb
* plugin/kubernetes: remove bunch a string ops This removes a bunch of appends to where not needed, makes dnsutil.Join take variadic args which removes the need to wrap in a new string slice. Signed-off-by: Miek Gieben <miek@miek.nl> * Fix calls to dnsutil.Join Signed-off-by: Miek Gieben <miek@miek.nl> * Revert these Signed-off-by: Miek Gieben <miek@miek.nl>
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
package etcd
|
|
|
|
import (
|
|
"net"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/coredns/coredns/plugin/etcd/msg"
|
|
"github.com/coredns/coredns/plugin/pkg/dnsutil"
|
|
"github.com/coredns/coredns/plugin/proxy"
|
|
"github.com/coredns/coredns/request"
|
|
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// UpdateStubZones checks etcd for an update on the stubzones.
|
|
func (e *Etcd) UpdateStubZones() {
|
|
go func() {
|
|
for {
|
|
e.updateStubZones()
|
|
time.Sleep(15 * time.Second)
|
|
}
|
|
}()
|
|
}
|
|
|
|
// Look in .../dns/stub/<zone>/xx for msg.Services. Loop through them
|
|
// extract <zone> and add them as forwarders (ip:port-combos) for
|
|
// the stub zones. Only numeric (i.e. IP address) hosts are used.
|
|
// Only the first zone configured on e is used for the lookup.
|
|
func (e *Etcd) updateStubZones() {
|
|
zone := e.Zones[0]
|
|
|
|
fakeState := request.Request{W: nil, Req: new(dns.Msg)}
|
|
fakeState.Req.SetQuestion(stubDomain+"."+zone, dns.TypeA)
|
|
|
|
services, err := e.Records(fakeState, false)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
stubmap := make(map[string]proxy.Proxy)
|
|
// track the nameservers on a per domain basis, but allow a list on the domain.
|
|
nameservers := map[string][]string{}
|
|
|
|
Services:
|
|
for _, serv := range services {
|
|
if serv.Port == 0 {
|
|
serv.Port = 53
|
|
}
|
|
ip := net.ParseIP(serv.Host)
|
|
if ip == nil {
|
|
log.Warningf("Non IP address stub nameserver: %s", serv.Host)
|
|
continue
|
|
}
|
|
|
|
domain := msg.Domain(serv.Key)
|
|
labels := dns.SplitDomainName(domain)
|
|
|
|
// If the remaining name equals any of the zones we have, we ignore it.
|
|
for _, z := range e.Zones {
|
|
// Chop of left most label, because that is used as the nameserver place holder
|
|
// and drop the right most labels that belong to zone.
|
|
// We must *also* chop of dns.stub. which means cutting two more labels.
|
|
domain = dnsutil.Join(labels[1 : len(labels)-dns.CountLabel(z)-2]...)
|
|
if domain == z {
|
|
log.Warningf("Skipping nameserver for domain we are authoritative for: %s", domain)
|
|
continue Services
|
|
}
|
|
}
|
|
nameservers[domain] = append(nameservers[domain], net.JoinHostPort(serv.Host, strconv.Itoa(serv.Port)))
|
|
}
|
|
|
|
for domain, nss := range nameservers {
|
|
stubmap[domain] = proxy.NewLookup(nss)
|
|
}
|
|
// atomic swap (at least that's what we hope it is)
|
|
if len(stubmap) > 0 {
|
|
e.Stubmap = &stubmap
|
|
}
|
|
return
|
|
}
|