duplicate.go raw

   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) }
  38