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20
vendor/github.com/miekg/dns/dnsutil/util.go
generated
vendored
20
vendor/github.com/miekg/dns/dnsutil/util.go
generated
vendored
@ -11,7 +11,7 @@ import (
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"github.com/miekg/dns"
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)
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// AddDomain adds origin to s if s is not already a FQDN.
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// AddOrigin adds origin to s if s is not already a FQDN.
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// Note that the result may not be a FQDN. If origin does not end
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// with a ".", the result won't either.
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// This implements the zonefile convention (specified in RFC 1035,
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@ -20,7 +20,9 @@ import (
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func AddOrigin(s, origin string) string {
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// ("foo.", "origin.") -> "foo." (already a FQDN)
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// ("foo", "origin.") -> "foo.origin."
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// ("foo"), "origin" -> "foo.origin"
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// ("foo", "origin") -> "foo.origin"
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// ("foo", ".") -> "foo." (Same as dns.Fqdn())
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// ("foo.", ".") -> "foo." (Same as dns.Fqdn())
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// ("@", "origin.") -> "origin." (@ represents the apex (bare) domain)
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// ("", "origin.") -> "origin." (not obvious)
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// ("foo", "") -> "foo" (not obvious)
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@ -34,32 +36,34 @@ func AddOrigin(s, origin string) string {
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if s == "@" || len(s) == 0 {
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return origin // Expand apex.
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}
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if origin == "." {
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return s + origin // AddOrigin(s, ".") is an expensive way to add a ".".
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return dns.Fqdn(s)
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}
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return s + "." + origin // The simple case.
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}
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// TrimDomainName trims origin from s if s is a subdomain.
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// This function will never return "", but returns "@" instead (@ represents the apex (bare) domain).
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// This function will never return "", but returns "@" instead (@ represents the apex domain).
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func TrimDomainName(s, origin string) string {
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// An apex (bare) domain is always returned as "@".
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// If the return value ends in a ".", the domain was not the suffix.
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// origin can end in "." or not. Either way the results should be the same.
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if len(s) == 0 {
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return "@" // Return the apex (@) rather than "".
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return "@"
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}
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// Someone is using TrimDomainName(s, ".") to remove a dot if it exists.
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if origin == "." {
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return strings.TrimSuffix(s, origin)
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}
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// Dude, you aren't even if the right subdomain!
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original := s
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s = dns.Fqdn(s)
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origin = dns.Fqdn(origin)
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if !dns.IsSubDomain(origin, s) {
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return s
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return original
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}
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slabels := dns.Split(s)
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