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package kubernetes
import (
"strings"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/etcd/msg"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/coredns/coredns/request"
)
// Reverse implements the ServiceBackend interface.
func (k *Kubernetes) Reverse(state request.Request, exact bool, opt plugin.Options) ([]msg.Service, error) {
ip := dnsutil.ExtractAddressFromReverse(state.Name())
if ip == "" {
_, e := k.Records(state, exact)
return nil, e
}
record := k.serviceRecordForIP(ip, state.Name())
if record == nil {
return nil, errNoItems
}
return []msg.Service{*record}, nil
}
// serviceRecordForIP gets a service record with a cluster ip matching the ip argument
// If a service cluster ip does not match, it checks all endpoints
func (k *Kubernetes) serviceRecordForIP(ip, name string) *msg.Service {
// First check services with cluster ips
service := k.APIConn.SvcIndexReverse(ip)
if service != nil {
if len(k.Namespaces) > 0 && !k.namespaceExposed(service.Namespace) {
return nil
}
domain := strings.Join([]string{service.Name, service.Namespace, Svc, k.primaryZone()}, ".")
return &msg.Service{Host: domain, TTL: k.ttl}
}
// If no cluster ips match, search endpoints
ep := k.APIConn.EpIndexReverse(ip)
if ep == nil || len(k.Namespaces) > 0 && !k.namespaceExposed(ep.Namespace) {
return nil
}
for _, eps := range ep.Subsets {
for _, addr := range eps.Addresses {
if addr.IP == ip {
domain := strings.Join([]string{endpointHostname(addr, k.endpointNameMode), ep.Name, ep.Namespace, Svc, k.primaryZone()}, ".")
return &msg.Service{Host: domain, TTL: k.ttl}
}
}
}
return nil
}
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