package kubernetes
import (
"testing"
"github.com/coredns/coredns/middleware/pkg/dnsrecorder"
"github.com/coredns/coredns/middleware/test"
"github.com/miekg/dns"
"golang.org/x/net/context"
"k8s.io/client-go/1.5/pkg/api"
)
var dnsTestCases = map[string](test.Case){
// *.any.svc-1-a.*.svc.cluster.local.,
"A Service": {
Qname: "svc1.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Service (wildcard)": {
Qname: "svc1.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"SRV Service (wildcards)": {
Qname: "*.any.svc1.*.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Service (wildcards)": {
Qname: "*.any.svc1.*.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"A Service (Headless)": {
Qname: "hdls1.testns.svc.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.2"),
test.A("hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.3"),
},
},
"SRV Service": {
Qname: "_http._tcp.svc1.testns.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.svc1.testns.svc.cluster.local. 0 IN SRV 0 100 80 svc1.testns.svc.cluster.local."),
},
Extra: []dns.RR{
test.A("svc1.testns.svc.cluster.local. 0 IN A 10.0.0.1"),
},
},
"SRV Service (Headless)": {
Qname: "_http._tcp.hdls1.testns.svc.cluster.local.", Qtype: dns.TypeSRV,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.SRV("_http._tcp.hdls1.testns.svc.cluster.local. 0 IN SRV 0 50 80 172-0-0-2.hdls1.testns.svc.cluster.local."),
test.SRV("_http._tcp.hdls1.testns.svc.cluster.local. 0 IN SRV 0 50 80 172-0-0-3.hdls1.testns.svc.cluster.local."),
},
Extra: []dns.RR{
test.A("172-0-0-2.hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.2"),
test.A("172-0-0-3.hdls1.testns.svc.cluster.local. 0 IN A 172.0.0.3"),
},
},
// TODO A External
"CNAME External": {
Qname: "external.testns.svc.cluster.local.", Qtype: dns.TypeCNAME,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.CNAME("external.testns.svc.cluster.local. 0 IN CNAME ext.interwebs.test."),
},
},
"AAAA Service (existing service)": {
Qname: "svc1.testns.svc.cluster.local.", Qtype: dns.TypeAAAA,
Rcode: dns.RcodeSuccess,
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"),
},
},
"AAAA Service (non-existing service)": {
Qname: "svc0.testns.svc.cluster.local.", Qtype: dns.TypeAAAA,
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"),
},
},
"TXT Schema": {
Qname: "dns-version.cluster.local.", Qtype: dns.TypeTXT,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.TXT("dns-version.cluster.local 28800 IN TXT 1.0.1"),
},
},
}
var podModeDisabledCases = map[string](test.Case){
"A Record Pod mode = Case 1": {
Qname: "10-240-0-1.podns.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Error: errPodsDisabled,
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 Record Pod mode = Case 2": {
Qname: "172-0-0-2.podns.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeNameError,
Error: errPodsDisabled,
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"),
},
},
}
var podModeInsecureCases = map[string](test.Case){
"A Record Pod mode = Case 1": {
Qname: "10-240-0-1.podns.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("10-240-0-1.podns.pod.cluster.local. 0 IN A 10.240.0.1"),
},
},
"A Record Pod mode = Case 2": {
Qname: "172-0-0-2.podns.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("172-0-0-2.podns.pod.cluster.local. 0 IN A 172.0.0.2"),
},
},
}
var podModeVerifiedCases = map[string](test.Case){
"A Record Pod mode = Case 1": {
Qname: "10-240-0-1.podns.pod.cluster.local.", Qtype: dns.TypeA,
Rcode: dns.RcodeSuccess,
Answer: []dns.RR{
test.A("10-240-0-1.podns.pod.cluster.local. 0 IN A 10.240.0.1"),
},
},
"A Record Pod mode = Case 2": {
Qname: "172-0-0-2.podns.pod.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"),
},
},
}
func TestServeDNS(t *testing.T) {
k := New([]string{"cluster.local."})
k.APIConn = &APIConnServeTest{}
k.Next = test.NextHandler(dns.RcodeSuccess, nil)
ctx := context.TODO()
runServeDNSTests(ctx, t, dnsTestCases, k)
//Set PodMode to Disabled
k.PodMode = PodModeDisabled
runServeDNSTests(ctx, t, podModeDisabledCases, k)
//Set PodMode to Insecure
k.PodMode = PodModeInsecure
runServeDNSTests(ctx, t, podModeInsecureCases, k)
//Set PodMode to Verified
k.PodMode = PodModeVerified
runServeDNSTests(ctx, t, podModeVerifiedCases, k)
}
func runServeDNSTests(ctx context.Context, t *testing.T, dnsTestCases map[string](test.Case), k *Kubernetes) {
for testname, tc := range dnsTestCases {
r := tc.Msg()
w := dnsrecorder.New(&test.ResponseWriter{})
_, err := k.ServeDNS(ctx, w, r)
if err != tc.Error {
t.Errorf("%v expected no error, got %v\n", testname, err)
return
}
if tc.Error != nil {
continue
}
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
for i, c := range resp.Answer {
if c.Header().Rrtype != dns.TypeCNAME {
continue
}
for _, a := range resp.Answer[:i] {
if a.Header().Name != c.(*dns.CNAME).Target {
continue
}
t.Errorf("%v: CNAME found after target record\n", testname)
t.Logf("%v Received:\n %v\n", testname, resp)
}
}
test.SortAndCheck(t, resp, tc)
}
}
type APIConnServeTest struct{}
func (APIConnServeTest) Run() { return }
func (APIConnServeTest) Stop() error { return nil }
func (APIConnServeTest) PodIndex(string) []interface{} {
a := make([]interface{}, 1)
a[0] = &api.Pod{
ObjectMeta: api.ObjectMeta{
Namespace: "podns",
},
Status: api.PodStatus{
PodIP: "10.240.0.1", // Remote IP set in test.ResponseWriter
},
}
return a
}
func (APIConnServeTest) ServiceList() []*api.Service {
svcs := []*api.Service{
{
ObjectMeta: api.ObjectMeta{
Name: "svc1",
Namespace: "testns",
},
Spec: api.ServiceSpec{
ClusterIP: "10.0.0.1",
Ports: []api.ServicePort{{
Name: "http",
Protocol: "tcp",
Port: 80,
}},
},
},
{
ObjectMeta: api.ObjectMeta{
Name: "hdls1",
Namespace: "testns",
},
Spec: api.ServiceSpec{
ClusterIP: api.ClusterIPNone,
},
},
{
ObjectMeta: api.ObjectMeta{
Name: "external",
Namespace: "testns",
},
Spec: api.ServiceSpec{
ExternalName: "ext.interwebs.test",
Ports: []api.ServicePort{{
Name: "http",
Protocol: "tcp",
Port: 80,
}},
},
},
}
return svcs
}
func (APIConnServeTest) EndpointsList() api.EndpointsList {
n := "test.node.foo.bar"
return api.EndpointsList{
Items: []api.Endpoints{
{
Subsets: []api.EndpointSubset{
{
Addresses: []api.EndpointAddress{
{
IP: "172.0.0.1",
Hostname: "ep1a",
},
},
Ports: []api.EndpointPort{
{
Port: 80,
Protocol: "tcp",
Name: "http",
},
},
},
},
ObjectMeta: api.ObjectMeta{
Name: "svc1",
Namespace: "testns",
},
},
{
Subsets: []api.EndpointSubset{
{
Addresses: []api.EndpointAddress{
{
IP: "172.0.0.2",
},
},
Ports: []api.EndpointPort{
{
Port: 80,
Protocol: "tcp",
Name: "http",
},
},
},
},
ObjectMeta: api.ObjectMeta{
Name: "hdls1",
Namespace: "testns",
},
},
{
Subsets: []api.EndpointSubset{
{
Addresses: []api.EndpointAddress{
{
IP: "172.0.0.3",
},
},
Ports: []api.EndpointPort{
{
Port: 80,
Protocol: "tcp",
Name: "http",
},
},
},
},
ObjectMeta: api.ObjectMeta{
Name: "hdls1",
Namespace: "testns",
},
},
{
Subsets: []api.EndpointSubset{
{
Addresses: []api.EndpointAddress{
{
IP: "10.9.8.7",
NodeName: &n,
},
},
},
},
},
},
}
}
func (APIConnServeTest) GetNodeByName(name string) (api.Node, error) {
return api.Node{
ObjectMeta: api.ObjectMeta{
Name: "test.node.foo.bar",
},
}, nil
}