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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package fqdn | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
| ) | ||
|
|
||
| func UnFQDN(s string) string { | ||
| return strings.TrimSuffix(s, ".") | ||
| } | ||
|
|
||
| func FQDN(s string) string { | ||
| if IsFqdn(s) { | ||
| return s | ||
| } | ||
| return s + "." | ||
| } | ||
|
|
||
| func IsFqdn(s string) bool { | ||
| return len(s) > 1 && s[len(s)-1] == '.' | ||
| } | ||
|
|
||
| func ValidateHostname(fqdn string) (err error) { | ||
| l := len(fqdn) | ||
| if l == 0 { | ||
| return fmt.Errorf("invalid hostname length: %d", l) | ||
| } | ||
|
|
||
| parts := strings.Split(fqdn, ".") | ||
| lastPart := len(parts) - 1 | ||
| for i, p := range parts { | ||
| if len(p) == 0 { | ||
| if i == lastPart { | ||
| break | ||
| } | ||
|
|
||
| return fmt.Errorf("empty hostname part at index %d", i) | ||
| } | ||
|
|
||
| if r := p[0]; !isValidHostFirstRune(rune(r)) { | ||
| return fmt.Errorf("invalid hostname part at index %d: invalid char %q at index %d", i, r, 0) | ||
| } | ||
|
|
||
| for j, r := range p[1:] { | ||
| if !isValidHostRune(r) { | ||
| return fmt.Errorf("invalid hostname part at index %d: invalid char %q at index %d", i, r, j+1) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // isValidHostRune returns true if r is a valid rune for a hostname part. | ||
| func isValidHostRune(r rune) (ok bool) { | ||
| return r == '-' || isValidHostFirstRune(r) | ||
| } | ||
|
|
||
| // isValidHostFirstRune returns true if r is a valid first rune for a hostname | ||
| // part. | ||
| func isValidHostFirstRune(r rune) (ok bool) { | ||
| return (r >= 'a' && r <= 'z') || | ||
| (r >= 'A' && r <= 'Z') || | ||
| (r >= '0' && r <= '9') | ||
| } |
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