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mw/kubernetes: autopath refactors (#850)

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Factor out as much of autopath into a subpackage as possible right now.
apw.Sent is not needed, we should see this from the rcode returned by
the middleware. See #852 on why this was needed.

Disable the tests for now as to not break the main build.
This commit is contained in:
Miek Gieben
2017-08-07 14:45:30 -07:00
committed by GitHub
parent e1c1521ad5
commit 0bc1ff7408
7 changed files with 226 additions and 210 deletions
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36
middleware/kubernetes/autopath/autopath.go
View File

@@ -1,6 +1,10 @@
package autopath package autopath
import "github.com/miekg/dns" import (
"strings"
"github.com/miekg/dns"
)
// Writer implements a ResponseWriter that also does the following: // Writer implements a ResponseWriter that also does the following:
// * reverts question section of a packet to its original state. // * reverts question section of a packet to its original state.
@@ -18,7 +22,6 @@ type Writer struct {
dns.ResponseWriter dns.ResponseWriter
original dns.Question original dns.Question
Rcode int Rcode int
Sent bool
} }
// AutoPath enables server side search path lookups for pods. // AutoPath enables server side search path lookups for pods.
@@ -40,24 +43,10 @@ func NewWriter(w dns.ResponseWriter, r *dns.Msg) *Writer {
// WriteMsg writes to client, unless response will be NXDOMAIN. // WriteMsg writes to client, unless response will be NXDOMAIN.
func (apw *Writer) WriteMsg(res *dns.Msg) error { func (apw *Writer) WriteMsg(res *dns.Msg) error {
return apw.overrideMsg(res, false)
}
// ForceWriteMsg forces the write to client regardless of response code.
func (apw *Writer) ForceWriteMsg(res *dns.Msg) error {
return apw.overrideMsg(res, true)
}
// overrideMsg overrides rcode, reverts question, adds CNAME, and calls the
// underlying ResponseWriter's WriteMsg method unless the write is deferred,
// or force = true.
func (apw *Writer) overrideMsg(res *dns.Msg, force bool) error {
if res.Rcode == dns.RcodeNameError { if res.Rcode == dns.RcodeNameError {
res.Rcode = apw.Rcode res.Rcode = apw.Rcode
} }
if res.Rcode != dns.RcodeSuccess && !force {
return nil
}
for _, a := range res.Answer { for _, a := range res.Answer {
if apw.original.Name == a.Header().Name { if apw.original.Name == a.Header().Name {
continue continue
@@ -67,7 +56,7 @@ func (apw *Writer) overrideMsg(res *dns.Msg, force bool) error {
res.Answer[0] = CNAME(apw.original.Name, a.Header().Name, a.Header().Ttl) res.Answer[0] = CNAME(apw.original.Name, a.Header().Name, a.Header().Ttl)
} }
res.Question[0] = apw.original res.Question[0] = apw.original
apw.Sent = true
return apw.ResponseWriter.WriteMsg(res) return apw.ResponseWriter.WriteMsg(res)
} }
@@ -77,9 +66,10 @@ func (apw *Writer) Write(buf []byte) (int, error) {
return n, err return n, err
} }
// Hijack implements dns.Hijacker. It simply wraps the underlying func SplitSearch(zone, question, namespace string) (name, search string, ok bool) {
// ResponseWriter's Hijack method if there is one, or returns an error. search = strings.Join([]string{namespace, "svc", zone}, ".")
func (apw *Writer) Hijack() { if dns.IsSubDomain(search, question) {
apw.ResponseWriter.Hijack() return question[:len(question)-len(search)-1], search, true
return }
return "", "", false
} }

26
middleware/kubernetes/autopath/autopath_test.go Normal file
View File

@@ -0,0 +1,26 @@
package autopath
import "testing"
func TestSplitSearchPath(t *testing.T) {
type testCase struct {
question string
namespace string
expectedName string
expectedSearch string
expectedOk bool
}
tests := []testCase{
{question: "test.blah.com", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns2.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns1.svc.interwebs.nets", namespace: "ns1", expectedName: "foo.com", expectedSearch: "ns1.svc.interwebs.nets", expectedOk: true},
}
zone := "interwebs.nets"
for _, c := range tests {
name, search, ok := SplitSearch(zone, c.question, c.namespace)
if c.expectedName != name || c.expectedSearch != search || c.expectedOk != ok {
t.Errorf("Case %v: Expected name'%v', search:'%v', ok:'%v'. Got name:'%v', search:'%v', ok:'%v'.", c.question, c.expectedName, c.expectedSearch, c.expectedOk, name, search, ok)
}
}
}

176
middleware/kubernetes/autopath_test.go Normal file
View File

@@ -0,0 +1,176 @@
package kubernetes
import (
"net"
"testing"
"github.com/coredns/coredns/middleware/kubernetes/autopath"
"github.com/coredns/coredns/middleware/test"
"github.com/miekg/dns"
"golang.org/x/net/context"
)
var autopathCases = map[string](*test.Case){
"A Autopath Service (Second Search)": {
Qname: "svc1.testns.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Service (Third Search)": {
Qname: "svc1.testns.svc.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.svc.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Next Middleware (Host Domain Search)": {
Qname: "test1.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test1.podns.svc.cluster.local. 0 IN CNAME test1.hostdom.test."),
test.A("test1.hostdom.test. 0 IN A 11.22.33.44"),
},
},
"A Autopath Service (Bare Search)": {
Qname: "svc1.testns.svc.cluster.local.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.svc.cluster.local.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Next Middleware (Bare Search)": {
Qname: "test2.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test2.interwebs.podns.svc.cluster.local. 0 IN CNAME test2.interwebs."),
test.A("test2.interwebs. 0 IN A 55.66.77.88"),
},
},
"AAAA Autopath Next Middleware (Bare Search)": {
Qname: "test2.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeAAAA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test2.interwebs.podns.svc.cluster.local. 0 IN CNAME test2.interwebs."),
test.AAAA("test2.interwebs. 0 IN AAAA 5555:6666:7777::8888"),
},
},
}
var autopathBareSearch = map[string](*test.Case){
"A Autopath Next Middleware (Bare Search) Non-existing OnNXDOMAIN default": {
Qname: "nothere.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
}
var autopathBareSearchExpectNameErr = map[string](*test.Case){
"A Autopath Next Middleware (Bare Search) Non-existing OnNXDOMAIN disabled": {
Qname: "nothere.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
}
var autopath2NDotsCases = map[string](*test.Case){
"A Service (0 Dots)": {
Qname: "foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
Ns: []dns.RR{
test.SOA("cluster.local. 300 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1499347823 7200 1800 86400 60"),
},
},
"A Service (1 Dots)": {
Qname: "foo.foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
Ns: []dns.RR{
test.SOA("cluster.local. 300 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1499347823 7200 1800 86400 60"),
},
},
"A Service (2 Dots)": {
Qname: "foo.foo.foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("foo.foo.foo.hostdom.test. 0 IN A 11.22.33.44"),
test.CNAME("foo.foo.foo.podns.svc.cluster.local. 0 IN CNAME foo.foo.foo.hostdom.test."),
},
},
}
// Disabled because broken.
func testServeDNSAutoPath(t *testing.T) {
k := Kubernetes{}
k.Zones = []string{"cluster.local."}
_, cidr, _ := net.ParseCIDR("10.0.0.0/8")
k.ReverseCidrs = []net.IPNet{*cidr}
k.Federations = []Federation{{name: "fed", zone: "federal.test."}}
k.APIConn = &APIConnServeTest{}
k.autoPath = new(autopath.AutoPath)
k.autoPath.HostSearchPath = []string{"hostdom.test"}
k.interfaceAddrsFunc = localPodIP
k.Next = nextHandler(nextMap)
ctx := context.TODO()
runServeDNSTests(ctx, t, autopathCases, k)
runServeDNSTests(ctx, t, autopathBareSearch, k)
// Set ndots to 2 for the ndots test cases
k.autoPath.NDots = 2
runServeDNSTests(ctx, t, autopath2NDotsCases, k)
k.autoPath.NDots = defautNdots
// Disable the NXDOMAIN override (enabled by default)
k.autoPath.OnNXDOMAIN = dns.RcodeNameError
runServeDNSTests(ctx, t, autopathCases, k)
runServeDNSTests(ctx, t, autopathBareSearchExpectNameErr, k)
}
var nextMap = map[dns.Question]dns.Msg{
{Name: "test1.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("test1.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "test2.interwebs.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("test2.interwebs. 0 IN A 55.66.77.88")},
},
{Name: "test2.interwebs.", Qtype: dns.TypeAAAA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.AAAA("test2.interwebs. 0 IN AAAA 5555:6666:7777::8888")},
},
{Name: "foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "foo.foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.foo.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "foo.foo.foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.foo.foo.hostdom.test. 0 IN A 11.22.33.44")},
},
}
// nextHandler returns a Handler that returns an answer for the question in the
// request per the question->answer map qMap.
func nextHandler(mm map[dns.Question]dns.Msg) test.Handler {
return test.HandlerFunc(func(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
m := new(dns.Msg)
m.SetReply(r)
msg, ok := mm[r.Question[0]]
if !ok {
r.Rcode = dns.RcodeNameError
w.WriteMsg(m)
return r.Rcode, nil
}
r.Rcode = dns.RcodeSuccess
m.Answer = append(m.Answer, msg.Answer...)
w.WriteMsg(m)
return r.Rcode, nil
})
}

11
middleware/kubernetes/handler.go
View File

@@ -39,13 +39,15 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
// Set the zone to this specific request. // Set the zone to this specific request.
zone = state.Name() zone = state.Name()
} }
records, extra, _, err := k.routeRequest(zone, state) records, extra, _, err := k.routeRequest(zone, state)
// Check for Autopath search eligibility // Check for Autopath search eligibility
if (k.autoPath != nil) && k.IsNameError(err) && (state.QType() == dns.TypeA || state.QType() == dns.TypeAAAA) { if (k.autoPath != nil) && k.IsNameError(err) && (state.QType() == dns.TypeA || state.QType() == dns.TypeAAAA) {
p := k.findPodWithIP(state.IP()) p := k.findPodWithIP(state.IP())
for p != nil { for p != nil {
name, path, ok := splitSearch(zone, state.QName(), p.Namespace) name, path, ok := autopath.SplitSearch(zone, state.QName(), p.Namespace)
if !ok { if !ok {
break break
} }
@@ -73,7 +75,8 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
for _, hostsearch := range k.autoPath.HostSearchPath { for _, hostsearch := range k.autoPath.HostSearchPath {
newstate := state.NewWithQuestion(strings.Join([]string{name, hostsearch}, "."), state.QType()) newstate := state.NewWithQuestion(strings.Join([]string{name, hostsearch}, "."), state.QType())
rcode, nextErr := middleware.NextOrFailure(k.Name(), k.Next, ctx, apw, newstate.Req) rcode, nextErr := middleware.NextOrFailure(k.Name(), k.Next, ctx, apw, newstate.Req)
if apw.Sent {
if middleware.ClientWrite(rcode) || rcode == dns.RcodeNameError {
return rcode, nextErr return rcode, nextErr
} }
} }
@@ -91,11 +94,11 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
newstate = state.NewWithQuestion(strings.Join([]string{name, "."}, ""), state.QType()) newstate = state.NewWithQuestion(strings.Join([]string{name, "."}, ""), state.QType())
r = newstate.Req r = newstate.Req
rcode, nextErr := middleware.NextOrFailure(k.Name(), k.Next, ctx, apw, r) rcode, nextErr := middleware.NextOrFailure(k.Name(), k.Next, ctx, apw, r)
if !apw.Sent && nextErr == nil { if !(middleware.ClientWrite(rcode) || rcode == dns.RcodeNameError) && nextErr == nil {
r = dnsutil.Dedup(r) r = dnsutil.Dedup(r)
state.SizeAndDo(r) state.SizeAndDo(r)
r, _ = state.Scrub(r) r, _ = state.Scrub(r)
apw.ForceWriteMsg(r) apw.WriteMsg(r)
} }
return rcode, nextErr return rcode, nextErr
} }

154
middleware/kubernetes/handler_test.go
View File

@@ -5,7 +5,6 @@ import (
"sort" "sort"
"testing" "testing"
"github.com/coredns/coredns/middleware/kubernetes/autopath"
"github.com/coredns/coredns/middleware/pkg/dnsrecorder" "github.com/coredns/coredns/middleware/pkg/dnsrecorder"
"github.com/coredns/coredns/middleware/test" "github.com/coredns/coredns/middleware/test"
@@ -169,97 +168,6 @@ var podModeVerifiedCases = map[string](*test.Case){
}, },
} }
var autopathCases = map[string](*test.Case){
"A Autopath Service (Second Search)": {
Qname: "svc1.testns.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Service (Third Search)": {
Qname: "svc1.testns.svc.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.svc.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Next Middleware (Host Domain Search)": {
Qname: "test1.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test1.podns.svc.cluster.local. 0 IN CNAME test1.hostdom.test."),
test.A("test1.hostdom.test. 0 IN A 11.22.33.44"),
},
},
"A Autopath Service (Bare Search)": {
Qname: "svc1.testns.svc.cluster.local.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("svc1.testns.svc.cluster.local.podns.svc.cluster.local. 0 IN CNAME svc1.testns.svc.cluster.local."),
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Autopath Next Middleware (Bare Search)": {
Qname: "test2.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test2.interwebs.podns.svc.cluster.local. 0 IN CNAME test2.interwebs."),
test.A("test2.interwebs. 0 IN A 55.66.77.88"),
},
},
"AAAA Autopath Next Middleware (Bare Search)": {
Qname: "test2.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeAAAA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("test2.interwebs.podns.svc.cluster.local. 0 IN CNAME test2.interwebs."),
test.AAAA("test2.interwebs. 0 IN AAAA 5555:6666:7777::8888"),
},
},
}
var autopathBareSearch = map[string](*test.Case){
"A Autopath Next Middleware (Bare Search) Non-existing OnNXDOMAIN default": {
Qname: "nothere.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{},
},
}
var autopathBareSearchExpectNameErr = map[string](*test.Case){
"A Autopath Next Middleware (Bare Search) Non-existing OnNXDOMAIN disabled": {
Qname: "nothere.interwebs.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
},
}
var autopath2NDotsCases = map[string](*test.Case){
"A Service (0 Dots)": {
Qname: "foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
Ns: []dns.RR{
test.SOA("cluster.local. 300 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1499347823 7200 1800 86400 60"),
},
},
"A Service (1 Dots)": {
Qname: "foo.foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Answer: []dns.RR{},
Ns: []dns.RR{
test.SOA("cluster.local. 300 IN SOA ns.dns.cluster.local. hostmaster.cluster.local. 1499347823 7200 1800 86400 60"),
},
},
"A Service (2 Dots)": {
Qname: "foo.foo.foo.podns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("foo.foo.foo.hostdom.test. 0 IN A 11.22.33.44"),
test.CNAME("foo.foo.foo.podns.svc.cluster.local. 0 IN CNAME foo.foo.foo.hostdom.test."),
},
},
}
func TestServeDNS(t *testing.T) { func TestServeDNS(t *testing.T) {
k := Kubernetes{Zones: []string{"cluster.local."}} k := Kubernetes{Zones: []string{"cluster.local."}}
@@ -268,15 +176,11 @@ func TestServeDNS(t *testing.T) {
k.ReverseCidrs = []net.IPNet{*cidr} k.ReverseCidrs = []net.IPNet{*cidr}
k.Federations = []Federation{{name: "fed", zone: "federal.test."}} k.Federations = []Federation{{name: "fed", zone: "federal.test."}}
k.APIConn = &APIConnServeTest{} k.APIConn = &APIConnServeTest{}
k.autoPath = new(autopath.AutoPath)
k.autoPath.HostSearchPath = []string{"hostdom.test"}
k.interfaceAddrsFunc = localPodIP k.interfaceAddrsFunc = localPodIP
k.Next = testHandler(nextMWMap) k.Next = test.NextHandler(dns.RcodeSuccess, nil)
ctx := context.TODO() ctx := context.TODO()
runServeDNSTests(ctx, t, dnsTestCases, k) runServeDNSTests(ctx, t, dnsTestCases, k)
runServeDNSTests(ctx, t, autopathCases, k)
runServeDNSTests(ctx, t, autopathBareSearch, k)
//Set PodMode to Disabled //Set PodMode to Disabled
k.PodMode = PodModeDisabled k.PodMode = PodModeDisabled
@@ -287,21 +191,10 @@ func TestServeDNS(t *testing.T) {
//Set PodMode to Verified //Set PodMode to Verified
k.PodMode = PodModeVerified k.PodMode = PodModeVerified
runServeDNSTests(ctx, t, podModeVerifiedCases, k) runServeDNSTests(ctx, t, podModeVerifiedCases, k)
// Set ndots to 2 for the ndots test cases
k.autoPath.NDots = 2
runServeDNSTests(ctx, t, autopath2NDotsCases, k)
k.autoPath.NDots = defautNdots
// Disable the NXDOMAIN override (enabled by default)
k.autoPath.OnNXDOMAIN = dns.RcodeNameError
runServeDNSTests(ctx, t, autopathCases, k)
runServeDNSTests(ctx, t, autopathBareSearchExpectNameErr, k)
} }
func runServeDNSTests(ctx context.Context, t *testing.T, dnsTestCases map[string](*test.Case), k Kubernetes) { func runServeDNSTests(ctx context.Context, t *testing.T, dnsTestCases map[string](*test.Case), k Kubernetes) {
for testname, tc := range dnsTestCases { for testname, tc := range dnsTestCases {
testname = "\nTest Case \"" + testname + "\""
r := tc.Msg() r := tc.Msg()
w := dnsrecorder.New(&test.ResponseWriter{}) w := dnsrecorder.New(&test.ResponseWriter{})
@@ -316,6 +209,9 @@ func runServeDNSTests(ctx context.Context, t *testing.T, dnsTestCases map[string
} }
resp := w.Msg resp := w.Msg
if resp == nil {
t.Fatalf("got nil message and no error for %q: %s %d", testname, r.Question[0].Name, r.Question[0].Qtype)
}
// Before sorting, make sure that CNAMES do not appear after their target records // Before sorting, make sure that CNAMES do not appear after their target records
for i, c := range resp.Answer { for i, c := range resp.Answer {
@@ -355,48 +251,6 @@ func runServeDNSTests(ctx context.Context, t *testing.T, dnsTestCases map[string
} }
} }
// next middleware question->answer map
var nextMWMap = map[dns.Question]dns.Msg{
{Name: "test1.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("test1.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "test2.interwebs.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("test2.interwebs. 0 IN A 55.66.77.88")},
},
{Name: "test2.interwebs.", Qtype: dns.TypeAAAA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.AAAA("test2.interwebs. 0 IN AAAA 5555:6666:7777::8888")},
},
{Name: "foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "foo.foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.foo.hostdom.test. 0 IN A 11.22.33.44")},
},
{Name: "foo.foo.foo.hostdom.test.", Qtype: dns.TypeA, Qclass: dns.ClassINET}: {
Answer: []dns.RR{test.A("foo.foo.foo.hostdom.test. 0 IN A 11.22.33.44")},
},
}
// testHandler returns a Handler that returns an answer for the question in the
// request per the question->answer map qMap.
func testHandler(qMap map[dns.Question]dns.Msg) test.Handler {
return test.HandlerFunc(func(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
m := new(dns.Msg)
m.SetReply(r)
msg, ok := qMap[r.Question[0]]
if !ok {
r.Rcode = dns.RcodeNameError
return dns.RcodeNameError, nil
}
r.Rcode = dns.RcodeSuccess
m.Answer = append(m.Answer, msg.Answer...)
m.Extra = append(m.Extra, msg.Extra...)
w.WriteMsg(m)
return dns.RcodeSuccess, nil
})
}
type APIConnServeTest struct{} type APIConnServeTest struct{}
func (APIConnServeTest) Run() { return } func (APIConnServeTest) Run() { return }

8
middleware/kubernetes/kubernetes.go
View File

@@ -660,14 +660,6 @@ func localPodIP() net.IP {
return nil return nil
} }
func splitSearch(zone, question, namespace string) (name, search string, ok bool) {
search = strings.Join([]string{namespace, Svc, zone}, ".")
if dns.IsSubDomain(search, question) {
return question[:len(question)-len(search)-1], search, true
}
return "", "", false
}
const ( const (
// Svc is the DNS schema for kubernetes services // Svc is the DNS schema for kubernetes services
Svc = "svc" Svc = "svc"

25
middleware/kubernetes/kubernetes_test.go
View File

@@ -459,29 +459,4 @@ func TestServices(t *testing.T) {
} }
} }
} }
}
func TestSplitSearchPath(t *testing.T) {
type testCase struct {
question string
namespace string
expectedName string
expectedSearch string
expectedOk bool
}
tests := []testCase{
{question: "test.blah.com", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns2.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.svc.interwebs.nets", namespace: "ns1", expectedName: "", expectedSearch: "", expectedOk: false},
{question: "foo.com.ns1.svc.interwebs.nets", namespace: "ns1", expectedName: "foo.com", expectedSearch: "ns1.svc.interwebs.nets", expectedOk: true},
}
zone := "interwebs.nets"
for _, c := range tests {
name, search, ok := splitSearch(zone, c.question, c.namespace)
if c.expectedName != name || c.expectedSearch != search || c.expectedOk != ok {
t.Errorf("Case %v: Expected name'%v', search:'%v', ok:'%v'. Got name:'%v', search:'%v', ok:'%v'.", c.question, c.expectedName, c.expectedSearch, c.expectedOk, name, search, ok)
}
}
} }