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package kubernetes
import (
"net"
"strings"
"github.com/coredns/coredns/middleware/etcd/msg"
"github.com/miekg/dns"
"k8s.io/client-go/1.5/pkg/api"
)
const defaultNSName = "ns.dns."
var corednsRecord dns.A
type interfaceAddrser interface {
interfaceAddrs() ([]net.Addr, error)
}
type interfaceAddrs struct{}
func (i interfaceAddrs) interfaceAddrs() ([]net.Addr, error) {
return net.InterfaceAddrs()
}
// DefaultNSMsg returns an msg.Service representing an A record for
// ns.dns.[zone] -> dns service ip. This A record is needed to legitimize
// the SOA response in middleware.NS(), which is hardcoded at ns.dns.[zone].
func (k *Kubernetes) defaultNSMsg(r recordRequest) msg.Service {
ns := k.coreDNSRecord()
s := msg.Service{
Key: msg.Path(strings.Join([]string{defaultNSName, r.zone}, "."), "coredns"),
Host: ns.A.String(),
}
return s
}
func isDefaultNS(name string, r recordRequest) bool {
return strings.Index(name, defaultNSName) == 0 && strings.Index(name, r.zone) == len(defaultNSName)
}
func (k *Kubernetes) coreDNSRecord() dns.A {
var (
svcName string
svcNamespace string
dnsIP net.IP
)
if len(corednsRecord.Hdr.Name) == 0 || corednsRecord.A == nil {
// get local Pod IP
localIP := k.interfaceAddrsFunc()
// Find endpoint matching IP to get service and namespace
endpointsList := k.APIConn.EndpointsList()
FindEndpoint:
for _, ep := range endpointsList.Items {
for _, eps := range ep.Subsets {
for _, addr := range eps.Addresses {
if localIP.Equal(net.ParseIP(addr.IP)) {
svcNamespace = ep.ObjectMeta.Namespace
svcName = ep.ObjectMeta.Name
break FindEndpoint
}
}
}
}
if len(svcName) == 0 {
corednsRecord.Hdr.Name = defaultNSName
corednsRecord.A = localIP
return corednsRecord
}
// Find service to get ClusterIP
serviceList := k.APIConn.ServiceList()
FindService:
for _, svc := range serviceList {
if svcName == svc.Name && svcNamespace == svc.Namespace {
if svc.Spec.ClusterIP == api.ClusterIPNone {
dnsIP = localIP
} else {
dnsIP = net.ParseIP(svc.Spec.ClusterIP)
}
break FindService
}
}
if dnsIP == nil {
dnsIP = localIP
}
corednsRecord.Hdr.Name = strings.Join([]string{svcName, svcNamespace, "svc."}, ".")
corednsRecord.A = dnsIP
}
return corednsRecord
}
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