diff options
Diffstat (limited to 'vendor/github.com/miekg/dns/defaults.go')
| -rw-r--r-- | vendor/github.com/miekg/dns/defaults.go | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/vendor/github.com/miekg/dns/defaults.go b/vendor/github.com/miekg/dns/defaults.go index c1558b79c..6d7e17605 100644 --- a/vendor/github.com/miekg/dns/defaults.go +++ b/vendor/github.com/miekg/dns/defaults.go @@ -5,6 +5,7 @@ import ( "net" "strconv" "strings" + "unicode" ) const hexDigit = "0123456789abcdef" @@ -330,8 +331,18 @@ func Fqdn(s string) string { // CanonicalName returns the domain name in canonical form. A name in canonical // form is lowercase and fully qualified. See Section 6.2 in RFC 4034. +// According to the RFC all uppercase US-ASCII letters in the owner name of the +// RR areeplaced by the corresponding lowercase US-ASCII letters. func CanonicalName(s string) string { - return strings.ToLower(Fqdn(s)) + var result strings.Builder + for _, ch := range s { + if unicode.IsUpper(ch) && (ch >= 0x00 && ch <= 0x7F) { + result.WriteRune(unicode.ToLower(ch)) + } else { + result.WriteRune(ch) + } + } + return Fqdn(result.String()) } // Copied from the official Go code. |