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package dns
//go:generate go run duplicate_generate.go
// IsDuplicate checks of r1 and r2 are duplicates of each other, excluding the TTL.
// So this means the header data is equal *and* the RDATA is the same. Returns true
// if so, otherwise false. It's a protocol violation to have identical RRs in a message.
func IsDuplicate(r1, r2 RR) bool {
// Check whether the record header is identical.
if !r1.Header().isDuplicate(r2.Header()) {
return false
}
// Check whether the RDATA is identical.
return r1.isDuplicate(r2)
}
func (r1 *RR_Header) isDuplicate(_r2 RR) bool {
r2, ok := _r2.(*RR_Header)
if !ok {
return false
}
if r1.Class != r2.Class {
return false
}
if r1.Rrtype != r2.Rrtype {
return false
}
if !isDuplicateName(r1.Name, r2.Name) {
return false
}
// ignore TTL
return true
}
// isDuplicateName checks if the domain names s1 and s2 are equal.
func isDuplicateName(s1, s2 string) bool { return equal(s1, s2) }