1 package networkvalidator
2
3 import (
4 "fmt"
5 "net"
6 "regexp"
7 "strings"
8 )
9
10 var (
11 domainRegex = regexp.MustCompile(`^(?i)[a-z0-9-]+(\.[a-z0-9-]+)+\.?$`)
12 hostnameRegex = regexp.MustCompile(`^[-a-z0-9]+(\.[-a-z0-9]+)*$`)
13 )
14
15 const hostnameSpec string = "must be between 2 and 63 characters long and contain only lowercase alphanumeric characters, hyphens and periods"
16
17 func ValidateIP(ip string) bool {
18 if ipVal := net.ParseIP(ip); ipVal == nil {
19 return false
20 }
21 return true
22 }
23
24 func ValidateMacAddress(macAddress string) (string, error) {
25 hardwareAddr, err := net.ParseMAC(macAddress)
26 return hardwareAddr.String(), err
27 }
28
29 func ValidateCIDR(address string, prefix int) bool {
30 cidr := fmt.Sprintf("%s/%d", address, prefix)
31 return IsValidCIDR(cidr)
32 }
33
34 func IsValidCIDR(subnet string) bool {
35 _, _, err := net.ParseCIDR(subnet)
36 return err == nil
37 }
38
39 func IsValidDomain(domain string) bool {
40 return domainRegex.MatchString(domain)
41 }
42
43 func IsValidHostname(hostname string) error {
44 if len(hostname) < 2 || len(hostname) > 64 {
45 return fmt.Errorf("invalid hostname length %v: must be between 2 and 63 characters long", len(hostname))
46 }
47
48 if strings.HasPrefix(hostname, ".") ||
49 strings.HasPrefix(hostname, "-") ||
50 strings.HasSuffix(hostname, ".") ||
51 strings.HasSuffix(hostname, "-") {
52 return fmt.Errorf("invalid hostname '%v': must not start or end with hyphens or periods", hostname)
53 }
54
55 if !hostnameRegex.MatchString(hostname) {
56 return fmt.Errorf("invalid hostname '%v': %v", hostname, hostnameSpec)
57 }
58
59 return nil
60 }
61
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