aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--middleware/backend.go29
-rw-r--r--middleware/backend_lookup.go (renamed from middleware/etcd/lookup.go)182
-rw-r--r--middleware/chaos/README.md4
-rw-r--r--middleware/etcd/README.md2
-rw-r--r--middleware/etcd/debug.go39
-rw-r--r--middleware/etcd/debug_test.go2
-rw-r--r--middleware/etcd/etcd.go58
-rw-r--r--middleware/etcd/handler.go53
-rw-r--r--middleware/etcd/proxy_lookup_test.go2
-rw-r--r--middleware/etcd/setup.go8
-rw-r--r--middleware/etcd/setup_test.go9
-rw-r--r--middleware/kubernetes/handler.go39
-rw-r--r--middleware/kubernetes/kubernetes.go60
-rw-r--r--middleware/kubernetes/lookup.go271
-rw-r--r--middleware/proxy/lookup.go4
15 files changed, 266 insertions, 496 deletions
diff --git a/middleware/backend.go b/middleware/backend.go
new file mode 100644
index 000000000..73f9b016d
--- /dev/null
+++ b/middleware/backend.go
@@ -0,0 +1,29 @@
+package middleware
+
+import (
+ "github.com/miekg/coredns/middleware/etcd/msg"
+ "github.com/miekg/coredns/request"
+
+ "github.com/miekg/dns"
+)
+
+// ServiceBackend defines a (dynamic) backend that returns a slice of service definitions.
+type ServiceBackend interface {
+ // Services communitates with the backend to retrieve the service defintion. Exact indicates
+ // on exact much are that we are allowed to recurs.
+ Services(state request.Request, exact bool, opt Options) ([]msg.Service, []msg.Service, error)
+
+ // Lookup is used to find records else where.
+ Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error)
+
+ // IsNameError return true if err indicated a record not found condition
+ IsNameError(err error) bool
+
+ // Debug returns a string used when returning debug services.
+ Debug() string
+}
+
+// Options are extra options that can be specified for a lookup.
+type Options struct {
+ Debug string // This is a debug query. A query prefixed with debug.o-o
+}
diff --git a/middleware/etcd/lookup.go b/middleware/backend_lookup.go
index 9f2309e94..a9a5e03fd 100644
--- a/middleware/etcd/lookup.go
+++ b/middleware/backend_lookup.go
@@ -1,4 +1,4 @@
-package etcd
+package middleware
import (
"fmt"
@@ -6,7 +6,6 @@ import (
"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"
@@ -14,26 +13,9 @@ import (
"github.com/miekg/dns"
)
-// Options are extra options that can be specified for a lookup.
-type Options struct {
- Debug string // This is a debug query. A query prefixed with debug.o-o
-}
-
-func (e Etcd) records(state request.Request, exact bool, opt Options) (services, debug []msg.Service, err error) {
- services, err = e.Records(state.Name(), exact)
- if err != nil {
- return
- }
- if opt.Debug != "" {
- debug = services
- }
- services = msg.Group(services)
- return
-}
-
-// A returns A records from etcd or an error.
-func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, false, opt)
+// A returns A records from Backend or an error.
+func A(b ServiceBackend, zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, debug, err
}
@@ -42,8 +24,7 @@ func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, op
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)) {
+ if Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
// x CNAME x is a direct loop, don't add those
continue
}
@@ -58,7 +39,7 @@ func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, op
}
state1 := state.NewWithQuestion(serv.Host, state.QType())
- nextRecords, nextDebug, err := e.A(zone, state1, append(previousRecords, newRecord), opt)
+ nextRecords, nextDebug, err := A(b, zone, state1, append(previousRecords, newRecord), opt)
if err == nil {
// Not only have we found something we should add the CNAME and the IP addresses.
@@ -75,9 +56,10 @@ func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, op
// We should already have found it
continue
}
- m1, e1 := e.Proxy.Lookup(state, target, state.QType())
+ // Lookup
+ m1, e1 := b.Lookup(state, target, state.QType())
if e1 != nil {
- debugMsg := msg.Service{Key: msg.Path(target, e.PathPrefix), Host: target, Text: " IN " + state.Type() + ": " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(target, b.Debug()), Host: target, Text: " IN " + state.Type() + ": " + e1.Error()}
debug = append(debug, debugMsg)
continue
}
@@ -94,9 +76,9 @@ func (e Etcd) A(zone string, state request.Request, previousRecords []dns.RR, op
return records, debug, nil
}
-// AAAA returns AAAA records from etcd or an error.
-func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, false, opt)
+// AAAA returns AAAA records from Backend or an error.
+func AAAA(b ServiceBackend, zone string, state request.Request, previousRecords []dns.RR, opt Options) (records []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, debug, err
}
@@ -106,7 +88,7 @@ func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR,
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)) {
+ if Name(state.Name()).Matches(dns.Fqdn(serv.Host)) {
// x CNAME x is a direct loop, don't add those
continue
}
@@ -121,7 +103,7 @@ func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR,
}
state1 := state.NewWithQuestion(serv.Host, state.QType())
- nextRecords, nextDebug, err := e.AAAA(zone, state1, append(previousRecords, newRecord), opt)
+ nextRecords, nextDebug, err := AAAA(b, zone, state1, append(previousRecords, newRecord), opt)
if err == nil {
// Not only have we found something we should add the CNAME and the IP addresses.
@@ -138,9 +120,9 @@ func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR,
// We should already have found it
continue
}
- m1, e1 := e.Proxy.Lookup(state, target, state.QType())
+ m1, e1 := b.Lookup(state, target, state.QType())
if e1 != nil {
- debugMsg := msg.Service{Key: msg.Path(target, e.PathPrefix), Host: target, Text: " IN " + state.Type() + ": " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(target, b.Debug()), Host: target, Text: " IN " + state.Type() + ": " + e1.Error()}
debug = append(debug, debugMsg)
continue
}
@@ -158,10 +140,10 @@ func (e Etcd) AAAA(zone string, state request.Request, previousRecords []dns.RR,
return records, debug, nil
}
-// SRV returns SRV records from etcd.
+// SRV returns SRV records from the Backend.
// If the Target is not a name but an IP address, a name is created on the fly.
-func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, false, opt)
+func SRV(b ServiceBackend, zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, nil, nil, err
}
@@ -201,15 +183,15 @@ func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, ext
lookup[srv.Target] = true
if !dns.IsSubDomain(zone, srv.Target) {
- m1, e1 := e.Proxy.Lookup(state, srv.Target, dns.TypeA)
+ m1, e1 := b.Lookup(state, srv.Target, dns.TypeA)
if e1 == nil {
extra = append(extra, m1.Answer...)
} else {
- debugMsg := msg.Service{Key: msg.Path(srv.Target, e.PathPrefix), Host: srv.Target, Text: " IN A: " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(srv.Target, b.Debug()), Host: srv.Target, Text: " IN A: " + e1.Error()}
debug = append(debug, debugMsg)
}
- m1, e1 = e.Proxy.Lookup(state, srv.Target, dns.TypeAAAA)
+ m1, e1 = b.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 {
@@ -218,7 +200,7 @@ func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, ext
}
}
} else {
- debugMsg := msg.Service{Key: msg.Path(srv.Target, e.PathPrefix), Host: srv.Target, Text: " IN AAAA: " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(srv.Target, b.Debug()), Host: srv.Target, Text: " IN AAAA: " + e1.Error()}
debug = append(debug, debugMsg)
}
break
@@ -226,12 +208,12 @@ func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, ext
// 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, debugAddr, e1 := e.A(zone, state1, nil, opt)
+ addr, debugAddr, e1 := A(b, zone, state1, nil, Options(opt))
if e1 == nil {
extra = append(extra, addr...)
debug = append(debug, debugAddr...)
}
- // e.AAA(zone, state1, nil) as well...?
+ // IPv6 lookups here as well? AAAA(zone, state1, nil).
case ip.To4() != nil:
serv.Host = msg.Domain(serv.Key)
srv := serv.NewSRV(state.QName(), weight)
@@ -249,10 +231,9 @@ func (e Etcd) SRV(zone string, state request.Request, opt Options) (records, ext
return records, extra, debug, nil
}
-// MX returns MX records from etcd.
-// If the Target is not a name but an IP address, a name is created on the fly.
-func (e Etcd) MX(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, false, opt)
+// MX returns MX records from the Backend. If the Target is not a name but an IP address, a name is created on the fly.
+func MX(b ServiceBackend, zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, nil, debug, err
}
@@ -274,14 +255,14 @@ func (e Etcd) MX(zone string, state request.Request, opt Options) (records, extr
lookup[mx.Mx] = true
if !dns.IsSubDomain(zone, mx.Mx) {
- m1, e1 := e.Proxy.Lookup(state, mx.Mx, dns.TypeA)
+ m1, e1 := b.Lookup(state, mx.Mx, dns.TypeA)
if e1 == nil {
extra = append(extra, m1.Answer...)
} else {
- debugMsg := msg.Service{Key: msg.Path(mx.Mx, e.PathPrefix), Host: mx.Mx, Text: " IN A: " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(mx.Mx, b.Debug()), Host: mx.Mx, Text: " IN A: " + e1.Error()}
debug = append(debug, debugMsg)
}
- m1, e1 = e.Proxy.Lookup(state, mx.Mx, dns.TypeAAAA)
+ m1, e1 = b.Lookup(state, mx.Mx, dns.TypeAAAA)
if e1 == nil {
// If we have seen CNAME's we *assume* that they are already added.
for _, a := range m1.Answer {
@@ -290,14 +271,14 @@ func (e Etcd) MX(zone string, state request.Request, opt Options) (records, extr
}
}
} else {
- debugMsg := msg.Service{Key: msg.Path(mx.Mx, e.PathPrefix), Host: mx.Mx, Text: " IN AAAA: " + e1.Error()}
+ debugMsg := msg.Service{Key: msg.Path(mx.Mx, b.Debug()), Host: mx.Mx, Text: " IN AAAA: " + e1.Error()}
debug = append(debug, debugMsg)
}
break
}
// Internal name
state1 := state.NewWithQuestion(mx.Mx, dns.TypeA)
- addr, debugAddr, e1 := e.A(zone, state1, nil, opt)
+ addr, debugAddr, e1 := A(b, zone, state1, nil, opt)
if e1 == nil {
extra = append(extra, addr...)
debug = append(debug, debugAddr...)
@@ -316,9 +297,9 @@ func (e Etcd) MX(zone string, state request.Request, opt Options) (records, extr
return records, extra, debug, nil
}
-// CNAME returns CNAME records from etcd or an error.
-func (e Etcd) CNAME(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, true, opt)
+// CNAME returns CNAME records from the backend or an error.
+func CNAME(b ServiceBackend, zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, true, opt)
if err != nil {
return nil, debug, err
}
@@ -332,46 +313,47 @@ func (e Etcd) CNAME(zone string, state request.Request, opt Options) (records []
return records, debug, nil
}
-// PTR returns the PTR records, only services that have a domain name as host are included.
-func (e Etcd) PTR(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, true, opt)
+// TXT returns TXT records from Backend or an error.
+func TXT(b ServiceBackend, zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, debug, err
}
for _, serv := range services {
- if ip := net.ParseIP(serv.Host); ip == nil {
- records = append(records, serv.NewPTR(state.QName(), serv.Host))
+ if serv.Text == "" {
+ continue
}
+ records = append(records, serv.NewTXT(state.QName()))
}
return records, debug, nil
}
-// TXT returns TXT records from etcd or an error.
-func (e Etcd) TXT(zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
- services, debug, err := e.records(state, false, opt)
+// PTR returns the PTR records from the backend, only services that have a domain name as host are included.
+// TODO(miek|infoblox): move k8s to this as well.
+func PTR(b ServiceBackend, zone string, state request.Request, opt Options) (records []dns.RR, debug []msg.Service, err error) {
+ services, debug, err := b.Services(state, true, opt)
if err != nil {
return nil, debug, err
}
for _, serv := range services {
- if serv.Text == "" {
- continue
+ if ip := net.ParseIP(serv.Host); ip == nil {
+ records = append(records, serv.NewPTR(state.QName(), serv.Host))
}
- records = append(records, serv.NewTXT(state.QName()))
}
return records, debug, nil
}
-// NS returns NS records from etcd or an error.
-func (e Etcd) NS(zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, err error) {
+// NS returns NS records from the backend
+func NS(b ServiceBackend, zone string, state request.Request, opt Options) (records, extra []dns.RR, debug []msg.Service, 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, debug, err := e.records(state, false, opt)
+ services, debug, err := b.Services(state, false, opt)
if err != nil {
return nil, nil, debug, err
}
@@ -396,8 +378,8 @@ func (e Etcd) NS(zone string, state request.Request, opt Options) (records, extr
return records, extra, debug, nil
}
-// SOA returns a SOA record from etcd.
-func (e Etcd) SOA(zone string, state request.Request, opt Options) ([]dns.RR, []msg.Service, error) {
+// SOA returns a SOA record from the backend.
+func SOA(b ServiceBackend, zone string, state request.Request, opt Options) ([]dns.RR, []msg.Service, error) {
header := dns.RR_Header{Name: zone, Rrtype: dns.TypeSOA, Ttl: 300, Class: dns.ClassINET}
soa := &dns.SOA{Hdr: header,
@@ -409,6 +391,62 @@ func (e Etcd) SOA(zone string, state request.Request, opt Options) ([]dns.RR, []
Expire: 86400,
Minttl: minTTL,
}
- // TODO(miek): fake some msg.Service here when returning.
+ // TODO(miek): fake some msg.Service here when returning?
return []dns.RR{soa}, nil, nil
}
+
+// BackendError writes an error response to the client.
+func BackendError(b ServiceBackend, zone string, rcode int, state request.Request, debug []msg.Service, err error, opt Options) (int, error) {
+ m := new(dns.Msg)
+ m.SetRcode(state.Req, rcode)
+ m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
+ m.Ns, _, _ = SOA(b, zone, state, opt)
+ if opt.Debug != "" {
+ m.Extra = ServicesToTxt(debug)
+ txt := ErrorToTxt(err)
+ if txt != nil {
+ m.Extra = append(m.Extra, ErrorToTxt(err))
+ }
+ }
+ state.SizeAndDo(m)
+ state.W.WriteMsg(m)
+ // Return success as the rcode to signal we have written to the client.
+ return dns.RcodeSuccess, nil
+}
+
+// ServicesToTxt puts debug in TXT RRs.
+func ServicesToTxt(debug []msg.Service) []dns.RR {
+ if debug == nil {
+ return nil
+ }
+
+ rr := make([]dns.RR, len(debug))
+ for i, d := range debug {
+ rr[i] = d.RR()
+ }
+ return rr
+}
+
+// ErrorToTxt puts in error's text into an TXT RR.
+func ErrorToTxt(err error) dns.RR {
+ if err == nil {
+ return nil
+ }
+ msg := err.Error()
+ if len(msg) > 255 {
+ msg = msg[:255]
+ }
+ t := new(dns.TXT)
+ t.Hdr.Class = dns.ClassCHAOS
+ t.Hdr.Ttl = 0
+ t.Hdr.Rrtype = dns.TypeTXT
+ t.Hdr.Name = "."
+
+ t.Txt = []string{msg}
+ return t
+}
+
+const (
+ minTTL = 60
+ hostmaster = "hostmaster"
+)
diff --git a/middleware/chaos/README.md b/middleware/chaos/README.md
index 57f18ede3..e03af7d00 100644
--- a/middleware/chaos/README.md
+++ b/middleware/chaos/README.md
@@ -9,8 +9,8 @@ This is useful for retrieving version or author information from the server.
chaos [VERSION] [AUTHORS...]
~~~
-* **VERSION** the version to return. Defaults to CoreDNS-<version>, if not set.
-* **AUTHORS** what authors to return. No default.
+* **VERSION** is the version to return. Defaults to `CoreDNS-<version>`, if not set.
+* **AUTHORS** is what authors to return. No default.
Note that you have to make sure that this middleware will get actual queries for the
following zones: `version.bind`, `version.server`, `authors.bind`, `hostname.bind` and
diff --git a/middleware/etcd/README.md b/middleware/etcd/README.md
index 7a835e3e1..edb47e54f 100644
--- a/middleware/etcd/README.md
+++ b/middleware/etcd/README.md
@@ -39,7 +39,7 @@ etcd [ZONES...] {
pointing to external names. If you want CoreDNS to act as a proxy for clients, you'll need to add
the proxy middleware.
* `tls` followed the cert, key and the CA's cert filenames.
-* `debug` allow debug queries. Prefix the name with `o-o.debug.` to retrieve extra information in the
+* `debug` allows for debug queries. Prefix the name with `o-o.debug.` to retrieve extra information in the
additional section of the reply in the form of TXT records.
## Examples
diff --git a/middleware/etcd/debug.go b/middleware/etcd/debug.go
index d5dfd6811..d2dd66830 100644
--- a/middleware/etcd/debug.go
+++ b/middleware/etcd/debug.go
@@ -1,12 +1,6 @@
package etcd
-import (
- "strings"
-
- "github.com/miekg/coredns/middleware/etcd/msg"
-
- "github.com/miekg/dns"
-)
+import "strings"
const debugName = "o-o.debug."
@@ -24,34 +18,3 @@ func isDebug(name string) string {
}
return name[len(debugName):]
}
-
-// servicesToTxt puts debug in TXT RRs.
-func servicesToTxt(debug []msg.Service) []dns.RR {
- if debug == nil {
- return nil
- }
-
- rr := make([]dns.RR, len(debug))
- for i, d := range debug {
- rr[i] = d.RR()
- }
- return rr
-}
-
-func errorToTxt(err error) dns.RR {
- if err == nil {
- return nil
- }
- msg := err.Error()
- if len(msg) > 255 {
- msg = msg[:255]
- }
- t := new(dns.TXT)
- t.Hdr.Class = dns.ClassCHAOS
- t.Hdr.Ttl = 0
- t.Hdr.Rrtype = dns.TypeTXT
- t.Hdr.Name = "."
-
- t.Txt = []string{msg}
- return t
-}
diff --git a/middleware/etcd/debug_test.go b/middleware/etcd/debug_test.go
index 930ceb8ce..b1dbb0264 100644
--- a/middleware/etcd/debug_test.go
+++ b/middleware/etcd/debug_test.go
@@ -31,7 +31,7 @@ func TestIsDebug(t *testing.T) {
func TestDebugLookup(t *testing.T) {
etc := newEtcdMiddleware()
- etc.Debug = true
+ etc.Debugging = true
for _, serv := range servicesDebug {
set(t, etc, serv.Key, 0, serv)
diff --git a/middleware/etcd/etcd.go b/middleware/etcd/etcd.go
index f405adec9..133f10c40 100644
--- a/middleware/etcd/etcd.go
+++ b/middleware/etcd/etcd.go
@@ -11,8 +11,10 @@ import (
"github.com/miekg/coredns/middleware/etcd/msg"
"github.com/miekg/coredns/middleware/pkg/singleflight"
"github.com/miekg/coredns/middleware/proxy"
+ "github.com/miekg/coredns/request"
etcdc "github.com/coreos/etcd/client"
+ "github.com/miekg/dns"
"golang.org/x/net/context"
)
@@ -26,17 +28,47 @@ type Etcd struct {
Ctx context.Context
Inflight *singleflight.Group
Stubmap *map[string]proxy.Proxy // list of proxies for stub resolving.
- Debug bool // Do we allow debug queries.
+ Debugging bool // Do we allow debug queries.
endpoints []string // Stored here as well, to aid in testing.
}
-// Records looks up records in etcd. If exact is true, it will lookup just
-// this name. This is used when find matches when completing SRV lookups
-// for instance.
+// Services implements the ServiceBackend interface.
+func (e *Etcd) Services(state request.Request, exact bool, opt middleware.Options) (services, debug []msg.Service, err error) {
+ services, err = e.Records(state.Name(), exact)
+ if err != nil {
+ return
+ }
+ if opt.Debug != "" {
+ debug = services
+ }
+ services = msg.Group(services)
+ return
+}
+
+// Lookup implements the ServiceBackend interface.
+func (e *Etcd) Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error) {
+ return e.Proxy.Lookup(state, name, typ)
+}
+
+// IsNameError implements the ServiceBackend interface.
+func (e *Etcd) IsNameError(err error) bool {
+ if ee, ok := err.(etcdc.Error); ok && ee.Code == etcdc.ErrorCodeKeyNotFound {
+ return true
+ }
+ return false
+}
+
+// Debug implements the ServiceBackend interface.
+func (e *Etcd) Debug() string {
+ return e.PathPrefix
+}
+
+// Records looks up records in etcd. If exact is true, it will lookup just this
+// name. This is used when find matches when completing SRV lookups for instance.
func (e *Etcd) Records(name string, exact bool) ([]msg.Service, error) {
path, star := msg.PathWithWildcard(name, e.PathPrefix)
- r, err := e.Get(path, true)
+ r, err := e.get(path, true)
if err != nil {
return nil, err
}
@@ -51,8 +83,8 @@ func (e *Etcd) Records(name string, exact bool) ([]msg.Service, error) {
}
}
-// Get is a wrapper for client.Get that uses SingleInflight to suppress multiple outstanding queries.
-func (e *Etcd) Get(path string, recursive bool) (*etcdc.Response, error) {
+// get is a wrapper for client.Get that uses SingleInflight to suppress multiple outstanding queries.
+func (e *Etcd) get(path string, recursive bool) (*etcdc.Response, error) {
resp, err := e.Inflight.Do(path, func() (interface{}, error) {
ctx, cancel := context.WithTimeout(e.Ctx, etcdTimeout)
defer cancel()
@@ -76,7 +108,7 @@ func (e *Etcd) Get(path string, recursive bool) (*etcdc.Response, error) {
// loopNodes recursively loops through the nodes and returns all the values. The nodes' keyname
// will be match against any wildcards when star is true.
-func (e Etcd) loopNodes(ns []*etcdc.Node, nameParts []string, star bool, bx map[msg.Service]bool) (sx []msg.Service, err error) {
+func (e *Etcd) loopNodes(ns []*etcdc.Node, nameParts []string, star bool, bx map[msg.Service]bool) (sx []msg.Service, err error) {
if bx == nil {
bx = make(map[msg.Service]bool)
}
@@ -145,18 +177,8 @@ func (e *Etcd) TTL(node *etcdc.Node, serv *msg.Service) uint32 {
return serv.TTL
}
-// etcNameError checks if the error is ErrorCodeKeyNotFound from etcd.
-func isEtcdNameError(err error) bool {
- if e, ok := err.(etcdc.Error); ok && e.Code == etcdc.ErrorCodeKeyNotFound {
- return true
- }
- return false
-}
-
const (
priority = 10 // default priority when nothing is set
ttl = 300 // default ttl when nothing is set
- minTTL = 60
- hostmaster = "hostmaster"
etcdTimeout = 5 * time.Second
)
diff --git a/middleware/etcd/handler.go b/middleware/etcd/handler.go
index ac9820046..c4fa3c46e 100644
--- a/middleware/etcd/handler.go
+++ b/middleware/etcd/handler.go
@@ -14,13 +14,13 @@ import (
// ServeDNS implements the middleware.Handler interface.
func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
- opt := Options{}
+ opt := middleware.Options{}
state := request.Request{W: w, Req: r}
if state.QClass() != dns.ClassINET {
return dns.RcodeServerFailure, fmt.Errorf("can only deal with ClassINET")
}
name := state.Name()
- if e.Debug {
+ if e.Debugging {
if debug := isDebug(name); debug != "" {
opt.Debug = r.Question[0].Name
state.Clear()
@@ -58,30 +58,30 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
)
switch state.Type() {
case "A":
- records, debug, err = e.A(zone, state, nil, opt)
+ records, debug, err = middleware.A(e, zone, state, nil, opt)
case "AAAA":
- records, debug, err = e.AAAA(zone, state, nil, opt)
+ records, debug, err = middleware.AAAA(e, zone, state, nil, opt)
case "TXT":
- records, debug, err = e.TXT(zone, state, opt)
+ records, debug, err = middleware.TXT(e, zone, state, opt)
case "CNAME":
- records, debug, err = e.CNAME(zone, state, opt)
+ records, debug, err = middleware.CNAME(e, zone, state, opt)
case "PTR":
- records, debug, err = e.PTR(zone, state, opt)
+ records, debug, err = middleware.PTR(e, zone, state, opt)
case "MX":
- records, extra, debug, err = e.MX(zone, state, opt)
+ records, extra, debug, err = middleware.MX(e, zone, state, opt)
case "SRV":
- records, extra, debug, err = e.SRV(zone, state, opt)
+ records, extra, debug, err = middleware.SRV(e, zone, state, opt)
case "SOA":
- records, debug, err = e.SOA(zone, state, opt)
+ records, debug, err = middleware.SOA(e, zone, state, opt)
case "NS":
if state.Name() == zone {
- records, extra, debug, err = e.NS(zone, state, opt)
+ records, extra, debug, err = middleware.NS(e, zone, state, opt)
break
}
fallthrough
default:
// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
- _, debug, err = e.A(zone, state, nil, opt)
+ _, debug, err = middleware.A(e, zone, state, nil, opt)
}
if opt.Debug != "" {
@@ -90,15 +90,15 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
state.Req.Question[0].Name = opt.Debug
}
- if isEtcdNameError(err) {
- return e.Err(zone, dns.RcodeNameError, state, debug, err, opt)
+ if e.IsNameError(err) {
+ return middleware.BackendError(e, zone, dns.RcodeNameError, state, debug, err, opt)
}
if err != nil {
- return e.Err(zone, dns.RcodeServerFailure, state, debug, err, opt)
+ return middleware.BackendError(e, zone, dns.RcodeServerFailure, state, debug, err, opt)
}
if len(records) == 0 {
- return e.Err(zone, dns.RcodeSuccess, state, debug, err, opt)
+ return middleware.BackendError(e, zone, dns.RcodeSuccess, state, debug, err, opt)
}
m := new(dns.Msg)
@@ -107,7 +107,7 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
m.Answer = append(m.Answer, records...)
m.Extra = append(m.Extra, extra...)
if opt.Debug != "" {
- m.Extra = append(m.Extra, servicesToTxt(debug)...)
+ m.Extra = append(m.Extra, middleware.ServicesToTxt(debug)...)
}
m = dnsutil.Dedup(m)
@@ -119,22 +119,3 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
// Name implements the Handler interface.
func (e *Etcd) Name() string { return "etcd" }
-
-// Err write an error response to the client.
-func (e *Etcd) Err(zone string, rcode int, state request.Request, debug []msg.Service, err error, opt Options) (int, error) {
- m := new(dns.Msg)
- m.SetRcode(state.Req, rcode)
- m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
- m.Ns, _, _ = e.SOA(zone, state, opt)
- if opt.Debug != "" {
- m.Extra = servicesToTxt(debug)
- txt := errorToTxt(err)
- if txt != nil {
- m.Extra = append(m.Extra, errorToTxt(err))
- }
- }
- state.SizeAndDo(m)
- state.W.WriteMsg(m)
- // Return success as the rcode to signal we have written to the client.
- return dns.RcodeSuccess, nil
-}
diff --git a/middleware/etcd/proxy_lookup_test.go b/middleware/etcd/proxy_lookup_test.go
index 8b4697e25..bafdfba06 100644
--- a/middleware/etcd/proxy_lookup_test.go
+++ b/middleware/etcd/proxy_lookup_test.go
@@ -17,7 +17,7 @@ import (
func TestProxyLookupFailDebug(t *testing.T) {
etc := newEtcdMiddleware()
etc.Proxy = proxy.New([]string{"127.0.0.1:154"})
- etc.Debug = true
+ etc.Debugging = true
for _, serv := range servicesProxy {
set(t, etc, serv.Key, 0, serv)
diff --git a/middleware/etcd/setup.go b/middleware/etcd/setup.go
index 147374acc..5bb9cf260 100644
--- a/middleware/etcd/setup.go
+++ b/middleware/etcd/setup.go
@@ -30,6 +30,7 @@ func setup(c *caddy.Controller) error {
if err != nil {
return middleware.Error("etcd", err)
}
+
if stubzones {
c.OnStartup(func() error {
e.UpdateStubZones()
@@ -55,7 +56,6 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
Stubmap: &stub,
}
var (
- client etcdc.KeysAPI
tlsCertFile = ""
tlsKeyFile = ""
tlsCAcertFile = ""
@@ -64,7 +64,6 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
)
for c.Next() {
if c.Val() == "etcd" {
- etc.Client = client
etc.Zones = c.RemainingArgs()
if len(etc.Zones) == 0 {
etc.Zones = make([]string, len(c.ServerBlockKeys))
@@ -77,7 +76,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
case "stubzones":
stubzones = true
case "debug":
- etc.Debug = true
+ etc.Debugging = true
case "path":
if !c.NextArg() {
return &Etcd{}, false, c.ArgErr()
@@ -117,7 +116,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
case "stubzones":
stubzones = true
case "debug":
- etc.Debug = true
+ etc.Debugging = true
case "path":
if !c.NextArg() {
return &Etcd{}, false, c.ArgErr()
@@ -161,6 +160,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
}
etc.Client = client
etc.endpoints = endpoints
+
return &etc, stubzones, nil
}
}
diff --git a/middleware/etcd/setup_test.go b/middleware/etcd/setup_test.go
index d7e6e344b..6e1eabdcd 100644
--- a/middleware/etcd/setup_test.go
+++ b/middleware/etcd/setup_test.go
@@ -28,17 +28,16 @@ func init() {
func newEtcdMiddleware() *Etcd {
ctxt, _ = context.WithTimeout(context.Background(), etcdTimeout)
- etcdCfg := etcdc.Config{
- Endpoints: []string{"http://localhost:2379"},
- }
- cli, _ := etcdc.New(etcdCfg)
+ endpoints := []string{"http://localhost:2379"}
+ client, _ := newEtcdClient(endpoints, "", "", "")
+
return &Etcd{
Proxy: proxy.New([]string{"8.8.8.8:53"}),
PathPrefix: "skydns",
Ctx: context.Background(),
Inflight: &singleflight.Group{},
Zones: []string{"skydns.test.", "skydns_extra.test.", "in-addr.arpa."},
- Client: etcdc.NewKeysAPI(cli),
+ Client: client,
}
}
diff --git a/middleware/kubernetes/handler.go b/middleware/kubernetes/handler.go
index 95009a04b..eb3071b18 100644
--- a/middleware/kubernetes/handler.go
+++ b/middleware/kubernetes/handler.go
@@ -23,6 +23,8 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
// TODO: find an alternative to this block
+ // TODO(miek): Why is this even here, why does the path Etcd takes not work?
+ // Should be a "case PTR" below. I would also like to use middleware.PTR for this.
ip := dnsutil.ExtractAddressFromReverse(state.Name())
if ip != "" {
records := k.getServiceRecordForIP(ip, state.Name())
@@ -54,41 +56,38 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
)
switch state.Type() {
case "A":
- records, err = k.A(zone, state, nil)
+ records, _, err = middleware.A(&k, zone, state, nil, middleware.Options{}) // Hmm wrt to '&k'
case "AAAA":
- records, err = k.AAAA(zone, state, nil)
+ records, _, err = middleware.AAAA(&k, zone, state, nil, middleware.Options{})
case "TXT":
- records, err = k.TXT(zone, state)
- // TODO: change lookup to return appropriate error. Then add code below
- // this switch to check for the error and return not implemented.
- //return dns.RcodeNotImplemented, nil
+ records, _, err = middleware.TXT(&k, zone, state, middleware.Options{})
case "CNAME":
- records, err = k.CNAME(zone, state)
+ records, _, err = middleware.CNAME(&k, zone, state, middleware.Options{})
case "MX":
- records, extra, err = k.MX(zone, state)
+ records, extra, _, err = middleware.MX(&k, zone, state, middleware.Options{})
case "SRV":
- records, extra, err = k.SRV(zone, state)
+ records, extra, _, err = middleware.SRV(&k, zone, state, middleware.Options{})
case "SOA":
- records = []dns.RR{k.SOA(zone, state)}
+ records, _, err = middleware.SOA(&k, zone, state, middleware.Options{})
case "NS":
if state.Name() == zone {
- records, extra, err = k.NS(zone, state)
+ records, extra, _, err = middleware.NS(&k, zone, state, middleware.Options{})
break
}
fallthrough
default:
// Do a fake A lookup, so we can distinguish between NODATA and NXDOMAIN
- _, err = k.A(zone, state, nil)
+ _, _, err = middleware.A(&k, zone, state, nil, middleware.Options{})
}
- if isKubernetesNameError(err) {
- return k.Err(zone, dns.RcodeNameError, state)
+ if k.IsNameError(err) {
+ return middleware.BackendError(&k, zone, dns.RcodeNameError, state, nil /*debug*/, err, middleware.Options{})
}
if err != nil {
return dns.RcodeServerFailure, err
}
if len(records) == 0 {
- return k.Err(zone, dns.RcodeSuccess, state)
+ return middleware.BackendError(&k, zone, dns.RcodeSuccess, state, nil /*debug*/, nil, middleware.Options{})
}
m.Answer = append(m.Answer, records...)
@@ -103,13 +102,3 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
// Name implements the Handler interface.
func (k Kubernetes) Name() string { return "kubernetes" }
-
-// Err writes an error response back to the client.
-func (k Kubernetes) Err(zone string, rcode int, state request.Request) (int, error) {
- m := new(dns.Msg)
- m.SetRcode(state.Req, rcode)
- m.Ns = []dns.RR{k.SOA(zone, state)}
- state.SizeAndDo(m)
- state.W.WriteMsg(m)
- return rcode, nil
-}
diff --git a/middleware/kubernetes/kubernetes.go b/middleware/kubernetes/kubernetes.go
index ee46f4632..43d98e079 100644
--- a/middleware/kubernetes/kubernetes.go
+++ b/middleware/kubernetes/kubernetes.go
@@ -3,6 +3,7 @@ package kubernetes
import (
"errors"
+ "fmt"
"log"
"strings"
"time"
@@ -11,8 +12,9 @@ import (
"github.com/miekg/coredns/middleware/etcd/msg"
"github.com/miekg/coredns/middleware/kubernetes/nametemplate"
"github.com/miekg/coredns/middleware/pkg/dnsutil"
- dns_strings "github.com/miekg/coredns/middleware/pkg/strings"
+ dnsstrings "github.com/miekg/coredns/middleware/pkg/strings"
"github.com/miekg/coredns/middleware/proxy"
+ "github.com/miekg/coredns/request"
"github.com/miekg/dns"
"k8s.io/kubernetes/pkg/api"
@@ -41,6 +43,28 @@ type Kubernetes struct {
Selector *labels.Selector
}
+// Services implements the ServiceBackend interface.
+func (k *Kubernetes) Services(state request.Request, exact bool, opt middleware.Options) ([]msg.Service, []msg.Service, error) {
+ s, e := k.Records(state.Name(), exact)
+ return s, nil, e // Haven't implemented debug queries yet.
+}
+
+// Lookup implements the ServiceBackend interface.
+func (k *Kubernetes) Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error) {
+ return k.Proxy.Lookup(state, name, typ)
+}
+
+// IsNameError implements the ServiceBackend interface.
+// TODO(infoblox): implement!
+func (k *Kubernetes) IsNameError(err error) bool {
+ return false
+}
+
+// Debug implements the ServiceBackend interface.
+func (k *Kubernetes) Debug() string {
+ return "debug"
+}
+
func (k *Kubernetes) getClientConfig() (*restclient.Config, error) {
// For a custom api server or running outside a k8s cluster
// set URL in env.KUBERNETES_MASTER or set endpoint in Corefile
@@ -73,7 +97,6 @@ func (k *Kubernetes) getClientConfig() (*restclient.Config, error) {
}
// InitKubeCache initializes a new Kubernetes cache.
-// TODO(miek): is this correct?
func (k *Kubernetes) InitKubeCache() error {
config, err := k.getClientConfig()
@@ -83,21 +106,24 @@ func (k *Kubernetes) InitKubeCache() error {
kubeClient, err := clientset_generated.NewForConfig(config)
if err != nil {
- log.Printf("[ERROR] Failed to create kubernetes notification controller: %v", err)
- return err
+ return fmt.Errorf("Failed to create kubernetes notification controller: %v", err)
}
- if k.LabelSelector == nil {
- log.Printf("[INFO] Kubernetes middleware configured without a label selector. No label-based filtering will be performed.")
- } else {
+
+ if k.LabelSelector != nil {
var selector labels.Selector
selector, err = unversionedapi.LabelSelectorAsSelector(k.LabelSelector)
k.Selector = &selector
if err != nil {
- log.Printf("[ERROR] Unable to create Selector for LabelSelector '%s'.Error was: %s", k.LabelSelector, err)
- return err
+ return fmt.Errorf("Unable to create Selector for LabelSelector '%s'.Error was: %s", k.LabelSelector, err)
}
+ }
+
+ if k.LabelSelector == nil {
+ log.Printf("[INFO] Kubernetes middleware configured without a label selector. No label-based filtering will be performed.")
+ } else {
log.Printf("[INFO] Kubernetes middleware configured with the label selector '%s'. Only kubernetes objects matching this label selector will be exposed.", unversionedapi.FormatLabelSelector(k.LabelSelector))
}
+
k.APIConn = newdnsController(kubeClient, k.ResyncPeriod, k.Selector)
return err
@@ -125,12 +151,11 @@ func (k *Kubernetes) getZoneForName(name string) (string, []string) {
return zone, serviceSegments
}
-// Records looks up services in kubernetes.
-// If exact is true, it will lookup just
-// this name. This is used when find matches when completing SRV lookups
+// Records looks up services in kubernetes. If exact is true, it will lookup
+// just this name. This is used when find matches when completing SRV lookups
// for instance.
func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
- // TODO: refector this.
+ // TODO: refactor this.
// Right now NamespaceFromSegmentArray do not supports PRE queries
ip := dnsutil.ExtractAddressFromReverse(name)
if ip != "" {
@@ -169,7 +194,7 @@ func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
// Abort if the namespace does not contain a wildcard, and namespace is not published per CoreFile
// Case where namespace contains a wildcard is handled in Get(...) method.
- if (!nsWildcard) && (len(k.Namespaces) > 0) && (!dns_strings.StringInSlice(namespace, k.Namespaces)) {
+ if (!nsWildcard) && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(namespace, k.Namespaces)) {
return nil, nil
}
@@ -219,7 +244,7 @@ func (k *Kubernetes) Get(namespace string, nsWildcard bool, servicename string,
if symbolMatches(namespace, item.Namespace, nsWildcard) && symbolMatches(servicename, item.Name, serviceWildcard) {
// If namespace has a wildcard, filter results against Corefile namespace list.
// (Namespaces without a wildcard were filtered before the call to this function.)
- if nsWildcard && (len(k.Namespaces) > 0) && (!dns_strings.StringInSlice(item.Namespace, k.Namespaces)) {
+ if nsWildcard && (len(k.Namespaces) > 0) && (!dnsstrings.StringInSlice(item.Namespace, k.Namespaces)) {
continue
}
resultItems = append(resultItems, item)
@@ -242,11 +267,6 @@ func symbolMatches(queryString string, candidateString string, wildcard bool) bo
return result
}
-// kubernetesNameError checks if the error is ErrorCodeKeyNotFound from kubernetes.
-func isKubernetesNameError(err error) bool {
- return false
-}
-
func (k *Kubernetes) getServiceRecordForIP(ip, name string) []msg.Service {
svcList, err := k.APIConn.svcLister.List(labels.Everything())
if err != nil {
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())
diff --git a/middleware/proxy/lookup.go b/middleware/proxy/lookup.go
index 549dfa0c7..340b4e31b 100644
--- a/middleware/proxy/lookup.go
+++ b/middleware/proxy/lookup.go
@@ -54,9 +54,9 @@ func New(hosts []string) Proxy {
// Lookup will use name and type to forge a new message and will send that upstream. It will
// set any EDNS0 options correctly so that downstream will be able to process the reply.
-func (p Proxy) Lookup(state request.Request, name string, tpe uint16) (*dns.Msg, error) {
+func (p Proxy) Lookup(state request.Request, name string, typ uint16) (*dns.Msg, error) {
req := new(dns.Msg)
- req.SetQuestion(name, tpe)
+ req.SetQuestion(name, typ)
state.SizeAndDo(req)
return p.lookup(state, req)
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-28 23:21:16 +0000