reject non-QUIC listen addresses

transport.go

 package libp2pquic
 
 import (
+	"fmt"
 	"sync"
 
 	pstore "github.com/libp2p/go-libp2p-peerstore"
@@ -33,7 +34,10 @@ func (t *QuicTransport) Dialer(laddr ma.Multiaddr, opts ...tpt.DialOpt) (tpt.Dia
 
 // Listen starts listening on laddr
 func (t *QuicTransport) Listen(laddr ma.Multiaddr) (tpt.Listener, error) {
-	// TODO: check if laddr is actually a QUIC address
+	if !t.Matches(laddr) {
+		return nil, fmt.Errorf("quic transport cannot listen on %q", laddr)
+	}
+
 	t.mutex.Lock()
 	defer t.mutex.Unlock()
 

transport_test.go

@@ -34,6 +34,13 @@ var _ = Describe("Transport", func() {
 			Expect(ln2).To(Equal(ln))
 			Expect(t.listeners).To(HaveLen(1))
 		})
+
+		It("errors if the address is not a QUIC address", func() {
+			maddr, err := ma.NewMultiaddr("/ip4/127.0.0.1/udp/1235/utp")
+			Expect(err).ToNot(HaveOccurred())
+			_, err = t.Listen(maddr)
+			Expect(err).To(MatchError("quic transport cannot listen on \"/ip4/127.0.0.1/udp/1235/utp\""))
+		})
 	})
 
 	It("matches", func() {