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Service names conform to RFC 1035

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This commit is contained in:
Michael Fraenkel 2016-07-24 13:01:38 -04:00
parent 31da82df52
commit b1e7e6cf46
9 changed files with 43 additions and 43 deletions
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6
hack/make-rules/test-cmd.sh
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@ -1765,15 +1765,15 @@ __EOF__
### Try to generate a service with invalid name (exceeding maximum valid size)
# Pre-condition: use --name flag
output_message=$(! kubectl expose -f hack/testdata/pod-with-large-name.yaml --name=invalid-large-service-name --port=8081 2>&1 "${kube_flags[@]}")
output_message=$(! kubectl expose -f hack/testdata/pod-with-large-name.yaml --name=invalid-large-service-name-that-has-more-than-sixty-three-characters --port=8081 2>&1 "${kube_flags[@]}")
# Post-condition: should fail due to invalid name
kube::test::if_has_string "${output_message}" 'metadata.name: Invalid value'
# Pre-condition: default run without --name flag; should succeed by truncating the inherited name
output_message=$(kubectl expose -f hack/testdata/pod-with-large-name.yaml --port=8081 2>&1 "${kube_flags[@]}")
# Post-condition: inherited name from pod has been truncated
kube::test::if_has_string "${output_message}" '\"kubernetes-serve-hostnam\" exposed'
kube::test::if_has_string "${output_message}" '\"kubernetes-serve-hostname-testing-sixty-three-characters-in-len\" exposed'
# Clean-up
kubectl delete svc kubernetes-serve-hostnam "${kube_flags[@]}"
kubectl delete svc kubernetes-serve-hostname-testing-sixty-three-characters-in-len "${kube_flags[@]}"
### Expose multiport object as a new service
# Pre-condition: don't use --port flag

2
hack/testdata/pod-with-large-name.yaml vendored
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@ -2,7 +2,7 @@
apiVersion: v1
kind: Pod
metadata:
name: kubernetes-serve-hostname
name: kubernetes-serve-hostname-testing-sixty-three-characters-in-length
labels:
name: kubernetes-serve-hostname
spec:

8
pkg/api/validation/validation.go
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@ -204,7 +204,7 @@ var ValidateReplicationControllerName = NameIsDNSSubdomain
// ValidateServiceName can be used to check whether the given service name is valid.
// Prefix indicates this name will be used as part of generation, in which case
// trailing dashes are allowed.
var ValidateServiceName = NameIsDNS952Label
var ValidateServiceName = NameIsDNS1035Label
// ValidateNodeName can be used to check whether the given node name is valid.
// Prefix indicates this name will be used as part of generation, in which case
@ -258,12 +258,12 @@ func NameIsDNSLabel(name string, prefix bool) []string {
return validation.IsDNS1123Label(name)
}
// NameIsDNS952Label is a ValidateNameFunc for names that must be a DNS 952 label.
func NameIsDNS952Label(name string, prefix bool) []string {
// NameIsDNS1035Label is a ValidateNameFunc for names that must be a DNS 952 label.
func NameIsDNS1035Label(name string, prefix bool) []string {
if prefix {
name = maskTrailingDash(name)
}
return validation.IsDNS952Label(name)
return validation.IsDNS1035Label(name)
}
// Validates that given value is not negative.

4
pkg/api/validation/validation_test.go
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@ -3449,7 +3449,7 @@ func TestValidateService(t *testing.T) {
{
name: "too long name",
tweakSvc: func(s *api.Service) {
s.Name = strings.Repeat("a", 25)
s.Name = strings.Repeat("a", 64)
},
numErrs: 1,
},
@ -3463,7 +3463,7 @@ func TestValidateService(t *testing.T) {
{
name: "too long generateName",
tweakSvc: func(s *api.Service) {
s.GenerateName = strings.Repeat("a", 25)
s.GenerateName = strings.Repeat("a", 64)
},
numErrs: 1,
},

6
pkg/dns/dns.go
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@ -665,7 +665,7 @@ func getSkyMsg(ip string, port int) (*skymsg.Service, string) {
// The conjunction of the following conditions forms the test for the federated service query
// pattern:
// 1. `path` has exactly 4+len(domainPath) segments: mysvc.myns.myfederation.svc.domain.path.
// 2. Service name component must be a valid RFC 952 name.
// 2. Service name component must be a valid RFC 1035 name.
// 3. Namespace component must be a valid RFC 1123 name.
// 4. Federation component must also be a valid RFC 1123 name.
// 5. Fourth segment is exactly "svc"
@ -679,8 +679,8 @@ func (kd *KubeDNS) isFederationQuery(path []string) bool {
glog.V(2).Infof("not a federation query: len(%q) != 4+len(%q)", path, kd.domainPath)
return false
}
if errs := validation.IsDNS952Label(path[0]); len(errs) != 0 {
glog.V(2).Infof("not a federation query: %q is not an RFC 952 label: %q", path[0], errs)
if errs := validation.IsDNS1035Label(path[0]); len(errs) != 0 {
glog.V(2).Infof("not a federation query: %q is not an RFC 1035 label: %q", path[0], errs)
return false
}
if errs := validation.IsDNS1123Label(path[1]); len(errs) != 0 {

4
pkg/kubectl/cmd/expose.go
View File

@ -170,8 +170,8 @@ func RunExpose(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []str
params := kubectl.MakeParams(cmd, names)
name := info.Name
if len(name) > validation.DNS952LabelMaxLength {
name = name[:validation.DNS952LabelMaxLength]
if len(name) > validation.DNS1035LabelMaxLength {
name = name[:validation.DNS1035LabelMaxLength]
}
params["default-name"] = name

8
pkg/kubectl/cmd/expose_test.go
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@ -230,10 +230,10 @@ func TestRunExposeService(t *testing.T) {
},
{
name: "truncate-name",
args: []string{"pod", "a-name-that-is-toooo-big-for-a-service"},
args: []string{"pod", "a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters"},
ns: "test",
calls: map[string]string{
"GET": "/namespaces/test/pods/a-name-that-is-toooo-big-for-a-service",
"GET": "/namespaces/test/pods/a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters",
"POST": "/namespaces/test/services",
},
input: &api.Pod{
@ -241,7 +241,7 @@ func TestRunExposeService(t *testing.T) {
},
flags: map[string]string{"selector": "svc=frompod", "port": "90", "labels": "svc=frompod", "generator": "service/v2"},
output: &api.Service{
ObjectMeta: api.ObjectMeta{Name: "a-name-that-is-toooo-big", Namespace: "", Labels: map[string]string{"svc": "frompod"}},
ObjectMeta: api.ObjectMeta{Name: "a-name-that-is-toooo-big-for-a-service-because-it-can-only-handle-63-characters", Namespace: "", Labels: map[string]string{"svc": "frompod"}},
Spec: api.ServiceSpec{
Ports: []api.ServicePort{
{
@ -253,7 +253,7 @@ func TestRunExposeService(t *testing.T) {
Selector: map[string]string{"svc": "frompod"},
},
},
expected: "service \"a-name-that-is-toooo-big\" exposed",
expected: "service \"a-name-that-is-toooo-big-for-a-service-because-it-can-only-hand\" exposed",
status: 200,
},
{

20
pkg/util/validation/validation.go
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@ -121,20 +121,20 @@ func IsDNS1123Subdomain(value string) []string {
return errs
}
const dns952LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
const DNS952LabelMaxLength int = 24
const dns1035LabelFmt string = "[a-z]([-a-z0-9]*[a-z0-9])?"
const DNS1035LabelMaxLength int = 63
var dns952LabelRegexp = regexp.MustCompile("^" + dns952LabelFmt + "$")
var dns1035LabelRegexp = regexp.MustCompile("^" + dns1035LabelFmt + "$")
// IsDNS952Label tests for a string that conforms to the definition of a label in
// DNS (RFC 952).
func IsDNS952Label(value string) []string {
// IsDNS1035Label tests for a string that conforms to the definition of a label in
// DNS (RFC 1035).
func IsDNS1035Label(value string) []string {
var errs []string
if len(value) > DNS952LabelMaxLength {
errs = append(errs, MaxLenError(DNS952LabelMaxLength))
if len(value) > DNS1035LabelMaxLength {
errs = append(errs, MaxLenError(DNS1035LabelMaxLength))
}
if !dns952LabelRegexp.MatchString(value) {
errs = append(errs, RegexError(dns952LabelFmt, "my-name", "abc-123"))
if !dns1035LabelRegexp.MatchString(value) {
errs = append(errs, RegexError(dns1035LabelFmt, "my-name", "abc-123"))
}
return errs
}

10
pkg/util/validation/validation_test.go
View File

@ -86,13 +86,13 @@ func TestIsDNS1123Subdomain(t *testing.T) {
}
}
func TestIsDNS952Label(t *testing.T) {
func TestIsDNS1035Label(t *testing.T) {
goodValues := []string{
"a", "ab", "abc", "a1", "a-1", "a--1--2--b",
strings.Repeat("a", 24),
strings.Repeat("a", 63),
}
for _, val := range goodValues {
if msgs := IsDNS952Label(val); len(msgs) != 0 {
if msgs := IsDNS1035Label(val); len(msgs) != 0 {
t.Errorf("expected true for '%s': %v", val, msgs)
}
}
@ -104,10 +104,10 @@ func TestIsDNS952Label(t *testing.T) {
"_", "a_", "_a", "a_b", "1_", "_1", "1_2",
".", "a.", ".a", "a.b", "1.", ".1", "1.2",
" ", "a ", " a", "a b", "1 ", " 1", "1 2",
strings.Repeat("a", 25),
strings.Repeat("a", 64),
}
for _, val := range badValues {
if msgs := IsDNS952Label(val); len(msgs) == 0 {
if msgs := IsDNS1035Label(val); len(msgs) == 0 {
t.Errorf("expected false for '%s'", val)
}
}