Wireshark-dev: Re: [Wireshark-dev] Add plugin_if_get_framenr()
From: Paul Offord <[email protected]>
Date: Wed, 6 Jan 2016 08:31:43 +0000

OK – I can now see that this won’t work because of the dataset hash table at the core of the mechanism.  I’ll think again.

 

From: Paul Offord
Sent: 04 January 2016 17:56
To: Developer support list for Wireshark <[email protected]>
Subject: RE: [Wireshark-dev] Add plugin_if_get_framenr()

 

Sorry for the typo - I meant:

 

WS_DLL_PUBLIC void plugin_if_get_cf_status(_cf_status *status_info);

 

From: [email protected] [mailto:[email protected]] On Behalf Of Paul Offord
Sent: 04 January 2016 17:52
To: Developer support list for Wireshark <[email protected]>
Subject: Re: [Wireshark-dev] Add plugin_if_get_framenr()

 

Hi Roland,

 

To avoid a plugin corrupting any of the main Wireshark structures, I’d like to use a mechanism just like Plugin IF.  The more I look at it I realise that I would basically need to create all the same functionality as Plugin IF, and so duplicate things like the callback registration function etc.  I’d like to re-use what you have done if I could and so my revised proposal is:

  1. Add a structure type to plugin_if.h to contain capture file status information
    • Below is the information I would like to expose
  2. Create the function that does the work in main_window.cpp
    • static void plugin_if_mainwindow_get_cf_status(_cf_status *status_info)
  3. Create plugin_if hook in main_window.cpp
    • plugin_if_register_gui_cb(PLUGIN_IF_GET_CF_STATUS, plugin_if_mainwindow_get_cf_status);
  4. Add an entry to the typedef enum for plugin_if_callback_t in plugin_if.h
    • PLUGIN_IF_GET_CF_STATUS
  5. Add a function to plugin_if.c such as:
    • extern void get_current_cf_status(_cf_status *status_info)
  6. Make this function available to plugins by adding the following to plugin_if.h
    • WS_DLL_PUBLIC void plugin_if_get_framenr(_cf_status *status_info);

struct _cf_status

{

      file_state   state;           /* Current state of capture file */

      gchar       *filename;        /* Name of capture file */

      guint32      count;           /* Total number of frames */

      guint32      num;             /**< Frame number */

      unsigned int passed_dfilter;  /**< 1 = display, 0 = no display */

};

 

If you don’t think this is acceptable, is it OK if I just copy the plugin_if code (renaming as necessary)?

 

Thanks and regards…Paul

 

From: [email protected] [mailto:[email protected]] On Behalf Of Paul Offord
Sent: 04 January 2016 15:51
To: Developer support list for Wireshark <[email protected]>
Subject: Re: [Wireshark-dev] Add plugin_if_get_framenr()

 

Thanks for the prompt response Roland.

 

Your proposed way sounds better, so I’ll rethink it in the way you describe.

 

Thanks and regards…Paul

 

From: [email protected] [mailto:[email protected]] On Behalf Of Roland Knall
Sent: 04 January 2016 15:43
To: Developer support list for Wireshark <[email protected]>
Subject: Re: [Wireshark-dev] Add plugin_if_get_framenr()

 

Hi

 

The plugin_if functionality exists, because methods called by plugins run in a different thread context than the gui. Therefore, if you want to gui to act in a certain way, you have to somehow cross the context to achieve whatever you want to do. 

 

Your proposed idea goes in the other direction. You just want the gui to provide you with information about the currently selected frame nr. The approach here would be to add such a functionality in a ui/*.h file, which exposes this information for both gtk and qt interfaces (for now you would need to implement both) and allow anyone to get this information without a thread change. 

 

The plugin if functions also by default do not return anything, as they can (at least theoratically) be bound to multiple outputs. the plugin_if_goto_frame could not only trigger the callback for the qt interface, but for a simultanously running gtk interface as well. In reality, this will not happen, but it could. So if you would ask the interface to give you the current frame number and 2-3 different systems are connected, which of the returned values (and it must be returned by a ref-parameter not return value) will you accept?

 

So, to summarize, no, the plugin-if is not the right thing to use, this is a funcionality best exposed in some ui/*.h file, maybe a new one, and an interface the gui implementations provide.

 

regards,

Roland

 

On Mon, Jan 4, 2016 at 4:32 PM, Paul Offord <[email protected]> wrote:

Hi,

 

I’d like to add a new Plugin IF function to get the currently displayed frame number.  I believe I can do it like this:

  1. Create the function that does the work in main_window.cpp
    • static guint32 plugin_if_mainwindow_get_framenr()
  1. Create plugin_if hook in main_window.cpp
    • plugin_if_register_gui_cb(PLUGIN_IF_GET_FRAMENR, plugin_if_mainwindow_get_framenr);
  1. Add an entry to the typedef enum for plugin_if_callback_t in plugin_if.h
    • PLUGIN_IF_GET_FRAMENR
  1. Add a function to plugin_if.c such as:
    • extern guint32 get_current_framenr()
  1. Make this function available to plugins by adding the following to plugin_if.h
    • WS_DLL_PUBLIC guint32 plugin_if_get_framenr();

Before I get carried away writing code

 

·        Would this be acceptable as an addition to Wireshark?

·        Is the above correct?

 

Thanks and regards…Paul


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