Wireshark-dev: Re: [Wireshark-dev] Its possible to build and run wireshark from IDE
From: Guy Harris <[email protected]>
Date: Thu, 8 Nov 2018 01:46:46 -0800
On Nov 8, 2018, at 12:52 AM, Dario Lombardo <[email protected]> wrote:

> On Wed, Nov 7, 2018 at 5:39 PM Tomer Bar <[email protected]> wrote:
>> i want to expose the validation of the display filter and use it like service?
>> any idea?
> 
> Do you want to do it programmatically (I mean you have a C code and you want to link with wireshark in some way) or can you do it running binary tshark?
> If the latter, you can run "tshark -Y FILTER" and check the return code. 2 means error in the filter. You need something more that that, but it may be a starting point.

Or use "dftest FILTER" - redirect its standard output and error to the null device (/dev/null on UN*X or NUL: on Windows), and check the exit status - again, 2 is an error, 0 is no error:

	$ build/run/dftest 'not a valid filter' >/dev/null 2>&1
	$ echo $?
	2
	$ build/run/dftest 'ip.addr == 127.0.0.1' >/dev/null 2>&1
	$ echo $?
	0