aboutsummaryrefslogtreecommitdiff
path: root/middleware/kubernetes/lookup.go
diff options
context:
space:
mode:
Diffstat (limited to 'middleware/kubernetes/lookup.go')
-rw-r--r--middleware/kubernetes/lookup.go271
1 files changed, 0 insertions, 271 deletions
diff --git a/middleware/kubernetes/lookup.go b/middleware/kubernetes/lookup.go
index fa41686a6..61689baac 100644
--- a/middleware/kubernetes/lookup.go
+++ b/middleware/kubernetes/lookup.go
@@ -2,11 +2,8 @@ package kubernetes
import (
"fmt"
- "math"
"net"
- "time"
- "github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/etcd/msg"
"github.com/miekg/coredns/middleware/pkg/dnsutil"
"github.com/miekg/coredns/request"
@@ -19,278 +16,10 @@ func (k Kubernetes) records(state request.Request, exact bool) ([]msg.Service, e
if err != nil {
return nil, err
}
- // TODO: Do we want to support the SkyDNS (hacky) Group feature?
services = msg.Group(services)
return services, nil
}
-// A returns A records from kubernetes or an error.
-func (k Kubernetes) A(zone string, state request.Request, previousRecords []dns.RR) (records []dns.RR, err error) {
- services, err := k.records(state, false)
- if err != nil {
- return nil, err
- }
-
- for _, serv := range services {
- ip := net.ParseIP(serv.Host)
- switch {
- case ip == nil:
- // TODO(miek): lowercasing? Should lowercase in everything see #85
- if middleware.Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
- // x CNAME x is a direct loop, don't add those
- continue
- }
-
- newRecord := serv.NewCNAME(state.QName(), serv.Host)
- if len(previousRecords) > 7 {
- // don't add it, and just continue
- continue
- }
- if dnsutil.DuplicateCNAME(newRecord, previousRecords) {
- continue
- }
-
- state1 := state.NewWithQuestion(serv.Host, state.QType())
- nextRecords, err := k.A(zone, state1, append(previousRecords, newRecord))
-
- if err == nil {
- // Not only have we found something we should add the CNAME and the IP addresses.
- if len(nextRecords) > 0 {
- records = append(records, newRecord)
- records = append(records, nextRecords...)
- }
- continue
- }
- // This means we can not complete the CNAME, try to look else where.
- target := newRecord.Target
- if dns.IsSubDomain(zone, target) {
- // We should already have found it
- continue
- }
- mes, err := k.Proxy.Lookup(state, target, state.QType())
- if err != nil {
- continue
- }
- // Len(mes.Answer) > 0 here is well?
- records = append(records, newRecord)
- records = append(records, mes.Answer...)
- continue
- case ip.To4() != nil:
- records = append(records, serv.NewA(state.QName(), ip.To4()))
- case ip.To4() == nil:
- // nodata?
- }
- }
- return records, nil
-}
-
-// AAAA returns AAAA records from kubernetes or an error.
-func (k Kubernetes) AAAA(zone string, state request.Request, previousRecords []dns.RR) (records []dns.RR, err error) {
- services, err := k.records(state, false)
- if err != nil {
- return nil, err
- }
-
- for _, serv := range services {
- ip := net.ParseIP(serv.Host)
- switch {
- case ip == nil:
- // Try to resolve as CNAME if it's not an IP, but only if we don't create loops.
- if middleware.Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
- // x CNAME x is a direct loop, don't add those
- continue
- }
-
- newRecord := serv.NewCNAME(state.QName(), serv.Host)
- if len(previousRecords) > 7 {
- // don't add it, and just continue
- continue
- }
- if dnsutil.DuplicateCNAME(newRecord, previousRecords) {
- continue
- }
-
- state1 := state.NewWithQuestion(serv.Host, state.QType())
- nextRecords, err := k.AAAA(zone, state1, append(previousRecords, newRecord))
-
- if err == nil {
- // Not only have we found something we should add the CNAME and the IP addresses.
- if len(nextRecords) > 0 {
- records = append(records, newRecord)
- records = append(records, nextRecords...)
- }
- continue
- }
- // This means we can not complete the CNAME, try to look else where.
- target := newRecord.Target
- if dns.IsSubDomain(zone, target) {
- // We should already have found it
- continue
- }
- m1, e1 := k.Proxy.Lookup(state, target, state.QType())
- if e1 != nil {
- continue
- }
- // Len(m1.Answer) > 0 here is well?
- records = append(records, newRecord)
- records = append(records, m1.Answer...)
- continue
- // both here again
- case ip.To4() != nil:
- // nada?
- case ip.To4() == nil:
- records = append(records, serv.NewAAAA(state.QName(), ip.To16()))
- }
- }
- return records, nil
-}
-
-// SRV returns SRV records from kubernetes.
-// If the Target is not a name but an IP address, a name is created on the fly and the IP address is put in
-// the additional section.
-func (k Kubernetes) SRV(zone string, state request.Request) (records []dns.RR, extra []dns.RR, err error) {
- services, err := k.records(state, false)
- if err != nil {
- return nil, nil, err
- }
-
- // Looping twice to get the right weight vs priority
- w := make(map[int]int)
- for _, serv := range services {
- weight := 100
- if serv.Weight != 0 {
- weight = serv.Weight
- }
- if _, ok := w[serv.Priority]; !ok {
- w[serv.Priority] = weight
- continue
- }
- w[serv.Priority] += weight
- }
- lookup := make(map[string]bool)
- for _, serv := range services {
- w1 := 100.0 / float64(w[serv.Priority])
- if serv.Weight == 0 {
- w1 *= 100
- } else {
- w1 *= float64(serv.Weight)
- }
- weight := uint16(math.Floor(w1))
- ip := net.ParseIP(serv.Host)
- switch {
- case ip == nil:
- srv := serv.NewSRV(state.QName(), weight)
- records = append(records, srv)
-
- if _, ok := lookup[srv.Target]; ok {
- break
- }
-
- lookup[srv.Target] = true
-
- if !dns.IsSubDomain(zone, srv.Target) {
- m1, e1 := k.Proxy.Lookup(state, srv.Target, dns.TypeA)
- if e1 == nil {
- extra = append(extra, m1.Answer...)
- }
- m1, e1 = k.Proxy.Lookup(state, srv.Target, dns.TypeAAAA)
- if e1 == nil {
- // If we have seen CNAME's we *assume* that they are already added.
- for _, a := range m1.Answer {
- if _, ok := a.(*dns.CNAME); !ok {
- extra = append(extra, a)
- }
- }
- }
- break
- }
- // Internal name, we should have some info on them, either v4 or v6
- // Clients expect a complete answer, because we are a recursor in their view.
- state1 := state.NewWithQuestion(srv.Target, dns.TypeA)
- addr, e1 := k.A(zone, state1, nil)
- if e1 == nil {
- extra = append(extra, addr...)
- }
- // k.AAA(zone, state1, nil) as well...?
- case ip.To4() != nil:
- serv.Host = serv.Key
- srv := serv.NewSRV(state.QName(), weight)
-
- records = append(records, srv)
- extra = append(extra, serv.NewA(srv.Target, ip.To4()))
- case ip.To4() == nil:
- serv.Host = serv.Key
- srv := serv.NewSRV(state.QName(), weight)
-
- records = append(records, srv)
- extra = append(extra, serv.NewAAAA(srv.Target, ip.To16()))
- }
- }
- return records, extra, nil
-}
-
-// MX returns MX records from kubernetes. Not implemented!
-func (k Kubernetes) MX(zone string, state request.Request) (records []dns.RR, extra []dns.RR, err error) {
- return nil, nil, err
-}
-
-// CNAME returns CNAME records from kubernetes. Not implemented!
-func (k Kubernetes) CNAME(zone string, state request.Request) (records []dns.RR, err error) {
- return nil, err
-}
-
-// TXT returns TXT records from kubernetes. Not implemented!
-func (k Kubernetes) TXT(zone string, state request.Request) (records []dns.RR, err error) {
- return nil, err
-}
-
-// NS returns NS records from kubernetes.
-func (k Kubernetes) NS(zone string, state request.Request) (records, extra []dns.RR, err error) {
- // NS record for this zone live in a special place, ns.dns.<zone>. Fake our lookup.
- // only a tad bit fishy...
- old := state.QName()
-
- state.Clear()
- state.Req.Question[0].Name = "ns.dns." + zone
- services, err := k.records(state, false)
- if err != nil {
- return nil, nil, err
- }
- // ... and reset
- state.Req.Question[0].Name = old
-
- for _, serv := range services {
- ip := net.ParseIP(serv.Host)
- switch {
- case ip == nil:
- return nil, nil, fmt.Errorf("NS record must be an IP address: %s", serv.Host)
- case ip.To4() != nil:
- serv.Host = serv.Key
- records = append(records, serv.NewNS(state.QName()))
- extra = append(extra, serv.NewA(serv.Host, ip.To4()))
- case ip.To4() == nil:
- serv.Host = serv.Key
- records = append(records, serv.NewNS(state.QName()))
- extra = append(extra, serv.NewAAAA(serv.Host, ip.To16()))
- }
- }
- return records, extra, nil
-}
-
-// SOA Record returns a SOA record from kubernetes.
-func (k Kubernetes) SOA(zone string, state request.Request) *dns.SOA {
- header := dns.RR_Header{Name: zone, Rrtype: dns.TypeSOA, Ttl: 300, Class: dns.ClassINET}
- return &dns.SOA{Hdr: header,
- Mbox: "hostmaster." + zone,
- Ns: "ns.dns." + zone,
- Serial: uint32(time.Now().Unix()),
- Refresh: 7200,
- Retry: 1800,
- Expire: 86400,
- Minttl: 60,
- }
-}
-
// PTR Record returns PTR records from kubernetes.
func (k Kubernetes) PTR(zone string, state request.Request) ([]dns.RR, error) {
reverseIP := dnsutil.ExtractAddressFromReverse(state.Name())
generated by cgit v1.2.3 (git 2.39.1) at 2025-08-03 13:31:33 +0000