1package dns
2
3//go:generate go run duplicate_generate.go
4
5// IsDuplicate checks of r1 and r2 are duplicates of each other, excluding the TTL.
6// So this means the header data is equal *and* the RDATA is the same. Returns true
7// if so, otherwise false. It's a protocol violation to have identical RRs in a message.
8func IsDuplicate(r1, r2 RR) bool {
9	// Check whether the record header is identical.
10	if !r1.Header().isDuplicate(r2.Header()) {
11		return false
12	}
13
14	// Check whether the RDATA is identical.
15	return r1.isDuplicate(r2)
16}
17
18func (r1 *RR_Header) isDuplicate(_r2 RR) bool {
19	r2, ok := _r2.(*RR_Header)
20	if !ok {
21		return false
22	}
23	if r1.Class != r2.Class {
24		return false
25	}
26	if r1.Rrtype != r2.Rrtype {
27		return false
28	}
29	if !isDuplicateName(r1.Name, r2.Name) {
30		return false
31	}
32	// ignore TTL
33	return true
34}
35
36// isDuplicateName checks if the domain names s1 and s2 are equal.
37func isDuplicateName(s1, s2 string) bool { return equal(s1, s2) }
38