Hi,
Simone, Thanks for your detailed suggestions.
So in your code, you mean
List<ByteBuffer> buffers = lease.getByteBuffers();
the list is the whole Continuation frames?
But how can I write the continuation frame to the server periodically. I
tried to use
session.newStream(headers,
new Promise.Adapter<>(), new Stream.Listener.Adapter() {}
this way to send the headers but the result is that I can get the whole
headersframe immediately.
HeadersFrame@70c986c9#1{end=false}css/infocard.css
DataFrame@73ea34d0#1{length:2800,end=true}css/infocard.css
My question is how to write the buffer(Continuation frame) into the server
periodically then the server can not get my whole headers frame in a short
time. Many thanks.
Best Regards
Muhui Jiang
2015-10-13 0:28 GMT+08:00 Simone Bordet <[email protected]>:
> Hi,
>
> On Sun, Oct 11, 2015 at 10:15 AM, Muhui Jiang <[email protected]>
> wrote:
> > Hi
> >
> > As Jetty doesn't support sending CONTINUATION frames explicitly from the
> > API. I am going to develop it by myself to support my research.
> >
> > I reviewed your implementations on how to sending priority frame and ping
> > frame. It seems that we can do this by adding an interface in Session,
> and
> > implement it in Http2Session by using control(stream, callback, frame);
> >
> > I also find that there is no continuation frame in the package
> > org.eclipse.jetty.http2.frames. Does that mean I also need to write a
> > construct method of continuation frame.
> >
> > Hope you can give me some hint or suggestions. Thank you so much.
>
> You can easily generate many Continuation frames by configuring the
> Generator to have a maxHeaderBlockFragment of only 1 byte:
>
> ```
> ByteBufferPool byteBufferPool = new MappedByteBufferPool();
> Generator generator = new Generator(byteBufferPool, 4096, 1);
> ByteBufferPool.Lease lease = new ByteBufferPool.Lease(byteBufferPool);
>
> HttpFields fields = new HttpFields();
> fields.put("foo", "<long_string_1>");
> fields.put("bar", "<long_string_2>");
> // add more fields if necessary
> MetaData.Request request = new MetaData.Request("GET", new
> HttpURI("http://localhost/path";), HttpVersion.HTTP_2, fields);
> HeadersFrame headers = new HeadersFrame(request, null, true);
> generator.control(lease, headers);
>
> List<ByteBuffer> buffers = lease.getByteBuffers();
> ```
>
> The more fields you add, the more Continuation frames you will have. I
> could easily generate 1900 frames with just 2 fields with very long
> strings.
>
> You don't have an API, but you can easily generate thousands of
> Continuation frames in this way, and then you can write them to the
> server with the timing you want to generate the DoS attack.
>
> Continuation frames being the aberration that they are, I don't think
> we will provide any API for them apart minimal support for parsing and
> generating them.
>
> --
> Simone Bordet
> ----
> http://cometd.org
> http://webtide.com
> Developer advice, training, services and support
> from the Jetty & CometD experts.
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