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validation.go
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validation.go
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package validation
import (
"fmt"
"net"
"strings"
k8svalidation "k8s.io/apimachinery/pkg/util/validation"
)
// ValidateDomain tests that the argument is a valid domain.
func ValidateDomain(domain string) []string {
if strings.TrimSpace(domain) == "" {
return nil
}
var errs []string
if strings.Contains(domain, "*") {
errs = k8svalidation.IsWildcardDNS1123Subdomain(domain)
} else {
errs = k8svalidation.IsDNS1123Subdomain(domain)
}
return errs
}
// ValidateEndpointAddress tests that the argument is a valid endpoint address.
func ValidateEndpointAddress(address string) []string {
ip := net.ParseIP(address)
if ip == nil {
return ValidateDomain(address)
}
return ValidateEndpointIP(address)
}
// ValidateEndpointIP tests that the argument is a valid IP address.
func ValidateEndpointIP(ipAddress string) []string {
// We disallow some IPs as endpoints or external-ips. Specifically,
// unspecified and loopback addresses are nonsensical and link-local
// addresses tend to be used for node-centric purposes (e.g. metadata
// service).
err := []string{}
ip := net.ParseIP(ipAddress)
if ip == nil {
err = append(err, fmt.Sprintf("%s must be a valid IP address", ipAddress))
return err
}
if ip.IsUnspecified() {
err = append(err, fmt.Sprintf("%s may not be unspecified (0.0.0.0)", ipAddress))
}
if ip.IsLoopback() {
err = append(err, fmt.Sprintf("%s may not be in the loopback range (127.0.0.0/8)", ipAddress))
}
if ip.IsLinkLocalUnicast() {
err = append(err, fmt.Sprintf("%s may not be in the link-local range (169.254.0.0/16)", ipAddress))
}
if ip.IsLinkLocalMulticast() {
err = append(err, fmt.Sprintf("%s may not be in the link-local multicast range (224.0.0.0/24)", ipAddress))
}
return err
}