Wireshark mailing list archives

Re: Display filter implementation


From: Lloyd <lloydkl.tech () gmail com>
Date: Wed, 4 Jul 2012 13:47:33 +0530

On Wed, Jul 4, 2012 at 12:05 AM, Guy Harris <guy () alum mit edu> wrote:

On Jul 2, 2012, at 8:12 AM, Lloyd wrote:

I would like to know more about Wireshark display filters. Is its
internals are documented? Especially the display filter execution
virtual machine's instruction set.

I saw the instructions (Byte code) in the source tree, I would like to
know more about it, any documentation available?

None other than the source code and whatever comments are in it.

Note that we make no guarantee that any detail of the implementation is fixed and unchanging, so the way it works 
internally now might not be the way it works internally in the future.  (We should preserve the way it works for 
users, modulo fixing bugs and making extensions and perhaps dealing better with character encodings.)  I'm not 
*anticipating* major changes; I'm just saying you shouldn't depend on, for example, the byte code never changing in 
an incompatible fashion.)
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Thanks Guy Harris. Would like to know one more thing, is it possible
to build display filter module alone in the Windows environment? If
not in Windows at least in Linux? Does it has complex dependencies?

Thanks,
  Lloyd
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