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