Re: Regarding display filter- how to redesign code to incorporate expressions other than protocols?

[Ateeth Kumar Thirukkovulur <athirukkovulur () uh edu>]

Not exactly.

Suppose I want to include a NOT operator in the display filter. Say "!
tcp". Which code must I change? I know it already exists. Where do I
include the symbols n expressions for newly added terms.

Do you get what I am saying?
On Apr 18, 2014 4:38 PM, "Guy Harris" <guy () alum mit edu> wrote:

> On Apr 18, 2014, at 2:13 PM, Ateeth Kumar Thirukkovulur <
> athirukkovulur () uh edu> wrote:
>
> > I want to know if there is any way to redesign the wireshark filter to
> incorporate algebraic expressions instead of filtering using protocols?
>
> Filtering *already* uses more than just protocols - it uses fields from
> protocols, for example, "ip.src == 127.0.0.1" or "ip.len == 1024".
>
> An algebraic expression, in order to be a *useful* filter, would have to
> incorporate variables of some sort; neither "(5 + 3)*2 == 16" nor "(5 +
> 3)*2 == 17" are particularly interesting filters (the first one would match
> all packets, the second one would match no packets).
>
> So you'd need some sort of variables; if the variables are fields from
> protocols, adding support for arithmetic operators, for example, "foo.len1
> - foo.len2 == 30", isn't really a "redesign", it's just an enhancement.
>
> Is that what you're talking about?
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