shortenName overzealously removes suffixes

[al-yisun]

Issue type

• Bug report

master

all

Steps to reproduce

call shortenName("a.b.fineexample.com", "example.com")

Expected behaviour

Shortens to a.b.fineexample.com

Actual behaviour

Shortens to a.b.fine

Have you checked if the documentation has the information you require?

n/a

Could you contribute a fix or help testing with this issue?

func shortenName(name, origin string) string {
	if name == origin {
		return "@"
	}
	return strings.TrimSuffix(name, "."+origin)
}

[Barnaby Gray]

Thanks for reporting this.
Do you have an example zone file / command that demonstrates the issue which I could add to the tests?