make if error for unsupported query type

1 files changed, 6 insertions, 2 deletions

diff --git a/internal/resolver/resolver.go b/internal/resolver/resolver.go
index c7a0694..3cdf846 100644
--- a/internal/resolver/resolver.go
+++ b/internal/resolver/resolver.go
@@ -11,8 +11,9 @@ import (
 )
 
 var (
-	ErrMaxDelegations = errors.New("max delegations exceeded")
-	ErrNoServers      = errors.New("no nameservers available")
+	ErrMaxDelegations  = errors.New("max delegations exceeded")
+	ErrNoServers       = errors.New("no nameservers available")
+	ErrUnsupportedType = errors.New("unsupported query type")
 )
 
 type Resolver struct {
@@ -251,6 +252,9 @@ func (r *Resolver) exchangeWithRetries(ctx context.Context, servers []string,
 	qname string, qtype uint16, rd bool) (*dns.Msg, error) {
 
 	msg := dns.NewMsg(qname, qtype)
+	if msg == nil {
+		return nil, fmt.Errorf("%w %d for %s", ErrUnsupportedType, qtype, qname)
+	}
 	msg.UDPSize = 4096
 	msg.RecursionDesired = rd