open-consul/vendor/github.com/miekg/dns/duplicate.go

39 lines
955 B
Go
Raw Normal View History

2019-03-26 21:50:42 +00:00
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. Return true
// is so, otherwise false.
2020-02-10 20:14:27 +00:00
// It's a protocol violation to have identical RRs in a message.
2019-03-26 21:50:42 +00:00
func IsDuplicate(r1, r2 RR) bool {
// Check whether the record header is identical.
if !r1.Header().isDuplicate(r2.Header()) {
2019-03-26 21:50:42 +00:00
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 {
2019-03-26 21:50:42 +00:00
return false
}
if !isDuplicateName(r1.Name, r2.Name) {
2019-03-26 21:50:42 +00:00
return false
}
// ignore TTL
return true
2019-03-26 21:50:42 +00:00
}
// isDuplicateName checks if the domain names s1 and s2 are equal.
func isDuplicateName(s1, s2 string) bool { return equal(s1, s2) }