diff options
Diffstat (limited to 'vendor/github.com/miekg/dns/defaults.go')
-rw-r--r-- | vendor/github.com/miekg/dns/defaults.go | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/vendor/github.com/miekg/dns/defaults.go b/vendor/github.com/miekg/dns/defaults.go index 75b17f0c1..c1558b79c 100644 --- a/vendor/github.com/miekg/dns/defaults.go +++ b/vendor/github.com/miekg/dns/defaults.go @@ -272,18 +272,24 @@ func IsMsg(buf []byte) error { // IsFqdn checks if a domain name is fully qualified. func IsFqdn(s string) bool { - s2 := strings.TrimSuffix(s, ".") - if s == s2 { + // Check for (and remove) a trailing dot, returning if there isn't one. + if s == "" || s[len(s)-1] != '.' { return false } + s = s[:len(s)-1] - i := strings.LastIndexFunc(s2, func(r rune) bool { + // If we don't have an escape sequence before the final dot, we know it's + // fully qualified and can return here. + if s == "" || s[len(s)-1] != '\\' { + return true + } + + // Otherwise we have to check if the dot is escaped or not by checking if + // there are an odd or even number of escape sequences before the dot. + i := strings.LastIndexFunc(s, func(r rune) bool { return r != '\\' }) - - // Test whether we have an even number of escape sequences before - // the dot or none. - return (len(s2)-i)%2 != 0 + return (len(s)-i)%2 != 0 } // IsRRset checks if a set of RRs is a valid RRset as defined by RFC 2181. |