duplicate.go (953B)
1 package 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. 8 func 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 18 func (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. 37 func isDuplicateName(s1, s2 string) bool { return equal(s1, s2) }