// isFederationQuery checks if the given query `path` matches the federated service query pattern.
// 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.
// 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"
// 6. The remaining segments match kd.domainPath.
// 7. And federation must be one of the listed federations in the config.
// Note: Because of the above conditions, this method will treat wildcard queries such as
// *.mysvc.myns.myfederation.svc.domain.path as non-federation queries.
// We can add support for wildcard queries later, if needed.
func (kd *KubeDNS) isFederationQuery(path []string) bool {
if len(path) != 4+len(kd.domainPath) {
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)
return false
}
if errs := validation.IsDNS1123Label(path[1]); len(errs) != 0 {
glog.V(2).Infof("not a federation query: %q is not an RFC 1123 label: %q", path[1], errs)
return false
}
if errs := validation.IsDNS1123Label(path[2]); len(errs) != 0 {
glog.V(2).Infof("not a federation query: %q is not an RFC 1123 label: %q", path[2], errs)
return false
}
if path[3] != serviceSubdomain {
glog.V(2).Infof("not a federation query: %q != %q (serviceSubdomain)", path[3], serviceSubdomain)
return false
}
for i, domComp := range kd.domainPath {
// kd.domainPath is reversed, so we need to look in the `path` in the reverse order.
if domComp != path[len(path)-i-1] {
glog.V(2).Infof("not a federation query: kd.domainPath[%d] != path[%d] (%q != %q)", i, len(path)-i-1, domComp, path[len(path)-i-1])
return false
}
}
if _, ok := kd.federations[path[2]]; !ok {
glog.V(2).Infof("not a federation query: kd.federations[%q] not found", path[2])
return false
}
return true
}
func getHostname(address *kapi.EndpointAddress, podHostnames map[string]endpoints.HostRecord) (string, bool) {
if len(address.Hostname) > 0 {
return address.Hostname, true
}
if hostRecord, exists := podHostnames[address.IP]; exists && len(validation.IsDNS1123Label(hostRecord.HostName)) == 0 {
return hostRecord.HostName, true
}
return "", false
}
// validateContext looks for errors in the context. It is not transitive, so errors in the reference authInfo or cluster configs are not included in this return
func validateContext(contextName string, context clientcmdapi.Context, config clientcmdapi.Config) []error {
validationErrors := make([]error, 0)
if len(context.AuthInfo) == 0 {
validationErrors = append(validationErrors, fmt.Errorf("user was not specified for context %q", contextName))
} else if _, exists := config.AuthInfos[context.AuthInfo]; !exists {
validationErrors = append(validationErrors, fmt.Errorf("user %q was not found for context %q", context.AuthInfo, contextName))
}
if len(context.Cluster) == 0 {
validationErrors = append(validationErrors, fmt.Errorf("cluster was not specified for context %q", contextName))
} else if _, exists := config.Clusters[context.Cluster]; !exists {
validationErrors = append(validationErrors, fmt.Errorf("cluster %q was not found for context %q", context.Cluster, contextName))
}
if len(context.Namespace) != 0 {
if len(validation.IsDNS1123Label(context.Namespace)) != 0 {
validationErrors = append(validationErrors, fmt.Errorf("namespace %q for context %q does not conform to the kubernetes DNS_LABEL rules", context.Namespace, contextName))
}
}
return validationErrors
}