package dns01 import "github.com/miekg/dns" // Update FQDN with CNAME if any. func updateDomainWithCName(r *dns.Msg, fqdn string) string { for _, rr := range r.Answer { if cn, ok := rr.(*dns.CNAME); ok { if cn.Hdr.Name == fqdn { return cn.Target } } } return fqdn }