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Wireshark-dev: Re: [Wireshark-dev] Bit for starting / stopping / new Capture

From: Paul Offord <Paul.Offord@xxxxxxxxxxxx>
Date: Wed, 17 Feb 2016 18:38:55 +0000

There’s an enhancement to plugin_if that doesn’t address your needs directly but may give you enough functionality.  It’s a function called plugin_if_get_ws_info.  You can call it from within a dissector and it populates the following structure:


typedef struct _ws_info_t


    gboolean ws_info_supported;                 /* false if no libpcap */

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

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

    guint32 cf_count;                           /* Total number of frames */

    guint32 cf_framenr;                         /**< Currently displayed frame number */

    gboolean frame_passed_dfilter;              /**< true = display, false = no display */

} ws_info_t;


You may be able to interpret the cf_filename and cf_state values to give you what you need.


The plugin_if_get_ws_info code has been accepted and merged but it’s not in 2.0.1.  It’s in the latest git pull and I guess will be in 2.0.2.


Best regards…Paul


From: wireshark-dev-bounces@xxxxxxxxxxxxx [mailto:wireshark-dev-bounces@xxxxxxxxxxxxx] On Behalf Of Guy Harris
Sent: 17 February 2016 16:59
To: Developer support list for Wireshark <wireshark-dev@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-dev] Bit for starting / stopping / new Capture


On Feb 17, 2016, at 7:16 AM, "FIXED-TERM Scholz Tobias (DC-IA/EAI)" <fixed-term.Tobias.Scholz@xxxxxxxxxxxxxxx> wrote:


I made some recherché, but couldn’t find any information to this topic. Is there a possibility to know (special bit for example), whether the user stopped, started the capture or opened Wireshark new?


There is nothing available to dissectors to indicate whether the packets are coming from a live capture or a capture done in the past, and thus there is nothing to indicate the status of a live capture.


That would be a great help for my dissector.


Why? What would you do differently, depending on whether you have a live capture and, if so, what the status of that capture is?


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