lnwire: add fuzz targets for gossip 1.75 messages

Add simple decode/encode targets for AnnouncementSignatures2,
ChannelAnnouncement2, and ChannelUpdate2.

lnwire/fuzz_test.go

@@ -114,6 +114,17 @@ func FuzzAnnounceSignatures(f *testing.F) {
 	})
 }
 
+func FuzzAnnounceSignatures2(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte) {
+		// Prefix with MsgAnnounceSignatures2.
+		data = prefixWithMsgType(data, MsgAnnounceSignatures2)
+
+		// Pass the message into our general fuzz harness for wire
+		// messages!
+		harness(t, data)
+	})
+}
+
 func FuzzChannelAnnouncement(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
 		// Prefix with MsgChannelAnnouncement.
@@ -125,6 +136,51 @@ func FuzzChannelAnnouncement(f *testing.F) {
 	})
 }
 
+func FuzzChannelAnnouncement2(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte) {
+		// Prefix with MsgChannelAnnouncement2.
+		data = prefixWithMsgType(data, MsgChannelAnnouncement2)
+
+		// Because require.Equal considers nil maps and empty maps
+		// to be non-equal, we must manually compare Features field
+		// rather than using the harness.
+
+		if len(data) > MaxSliceLength {
+			return
+		}
+
+		r := bytes.NewReader(data)
+		msg, err := ReadMessage(r, 0)
+		if err != nil {
+			return
+		}
+
+		// We will serialize the message into a new bytes buffer.
+		var b bytes.Buffer
+		_, err = WriteMessage(&b, msg, 0)
+		require.NoError(t, err)
+
+		// Deserialize the message from the serialized bytes buffer, and
+		// then assert that the original message is equal to the newly
+		// deserialized message.
+		newMsg, err := ReadMessage(&b, 0)
+		require.NoError(t, err)
+
+		require.IsType(t, &ChannelAnnouncement2{}, msg)
+		first, _ := msg.(*ChannelAnnouncement2)
+		require.IsType(t, &ChannelAnnouncement2{}, newMsg)
+		second, _ := newMsg.(*ChannelAnnouncement2)
+
+		// We can't use require.Equal for Features, since we consider
+		// the empty map and nil to be equivalent.
+		require.True(t, first.Features.Val.Equals(&second.Features.Val))
+		first.Features.Val = *NewRawFeatureVector()
+		second.Features.Val = *NewRawFeatureVector()
+
+		require.Equal(t, first, second)
+	})
+}
+
 func FuzzChannelReestablish(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
 		// Prefix with MsgChannelReestablish.
@@ -147,6 +203,17 @@ func FuzzChannelUpdate(f *testing.F) {
 	})
 }
 
+func FuzzChannelUpdate2(f *testing.F) {
+	f.Fuzz(func(t *testing.T, data []byte) {
+		// Prefix with MsgChannelUpdate2.
+		data = prefixWithMsgType(data, MsgChannelUpdate2)
+
+		// Pass the message into our general fuzz harness for wire
+		// messages!
+		harness(t, data)
+	})
+}
+
 func FuzzClosingSigned(f *testing.F) {
 	f.Fuzz(func(t *testing.T, data []byte) {
 		// Prefix with MsgClosingSigned.