Merge pull request #201 from Bytom/v0.1

[bytom/vapor.git] / vendor / github.com / miekg / dns / duplicate.go

diff --git a/vendor/github.com/miekg/dns/duplicate.go b/vendor/github.com/miekg/dns/duplicate.go
new file mode 100644 (file)
index 0000000..00cda0a
--- /dev/null
+++ b/vendor/github.com/miekg/dns/duplicate.go
@@ -0,0 +1,38 @@
+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.
+// It's is 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) }