1package dnsutil 2 3import "github.com/miekg/dns" 4 5// DuplicateCNAME returns true if r already exists in records. 6func DuplicateCNAME(r *dns.CNAME, records []dns.RR) bool { 7 for _, rec := range records { 8 if v, ok := rec.(*dns.CNAME); ok { 9 if v.Target == r.Target { 10 return true 11 } 12 } 13 } 14 return false 15} 16