Ethereal-dev: Re: [Ethereal-dev] packet_info v/s frame_data

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

Date Index Thread Index Other Months All Mailing Lists
Date Prev Date Next Thread Prev Thread Next
From: Guy Harris <gharris@xxxxxxxxxxxx>
Date: Wed, 21 Mar 2001 20:26:34 -0800
On Thu, Mar 22, 2001 at 09:33:13AM +0600, Diwakar Shetty wrote:
> There is some information which i get during first pass of dissector and
> which I have to maintain per packet.  This field will be used for later
> processing and should not be modified after first pass.

Then you should use the "p_add_proto_data()" call to attach your own
private data structure to the packet, and use the "p_get_proto_data()"
call to fetch that data.

> The following code WORKS :
> 
> if (pinfo->fd->flags.visited == 0)
>             pinfo->fd->old_len = tvb_length_remaining(tvb, offset);

"pinfo->fd" points to a "frame_data" structure.

A "frame_data" structure does not contain an "old_len" field.

So how can that code possibly work?  How can it even *compile*?