improve logging of undecryptable packets

internal/wire/header.go

@@ -247,3 +247,11 @@ func (h *Header) ParseExtended(b *bytes.Reader, ver protocol.VersionNumber) (*Ex
 func (h *Header) toExtendedHeader() *ExtendedHeader {
 	return &ExtendedHeader{Header: *h}
 }
+
+// PacketType is the type of the packet, for logging purposes
+func (h *Header) PacketType() string {
+	if h.IsLongHeader {
+		return h.Type.String()
+	}
+	return "1-RTT"
+}

internal/wire/header_test.go

@@ -558,4 +558,9 @@ var _ = Describe("Header Parsing", func() {
 			}
 		})
 	})
+
+	It("tells its packet type for logging", func() {
+		Expect((&Header{IsLongHeader: true, Type: protocol.PacketTypeHandshake}).PacketType()).To(Equal("Handshake"))
+		Expect((&Header{}).PacketType()).To(Equal("1-RTT"))
+	})
 })