Re: [Qemu-devel] [PATCH v2 6/6] io: Reply to ping frames

[Brandon Carpenter <brandon.carpenter@cypherpath.com>]

On Mon, Sep 11, 2017 at 10:37 AM, Daniel P. Berrange 
<berrange@redhat.com> wrote:
> At the time qio_channel_websock_decode_header is run, 'encinput' is 
> only guaranteed to contain enough data to decode the header.

Because the PING opcode is a control frame, this bit of code earlier in 
the function will ensure the entire frame has been read before the PING 
processing occurs:

>       if (ioc->encinput.offset < ioc->payload_remain) {
>             /* Wait for the entire payload before processing control 
> frames
>              * because the payload will most likely be echoed back. */
>             if (ioc->opcode & 
> QIO_CHANNEL_WEBSOCK_CONTROL_OPCODE_MASK) {
>                 return QIO_CHANNEL_ERR_BLOCK;
>             }
>             payload_len = ioc->encinput.offset - 
> (ioc->encinput.offset % 4);

--
Brandon Carpenter | Software Engineer
Cypherpath, Inc.
400 Columbia Point Drive Ste 101 | Richland, Washington USA
Office: (650) 713-3060


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