Wireshark · Ethereal-dev: Re: [Ethereal-dev] problem in pseudo header

["Ravi Kondamuru" <ravikondamuru@xxxxxxxxx>]

When I stepped through to the seek_read() function, I realized that wth->pseudo_header and pseudo_header point to different memory addresses. I was actually expecting that they are going to be the same. Thats when I tried setting values in the pseudo_header and it worked. 

Some of early/ core members of ethereal-dev might be able to shed light on what wth->pseudo_header is pointing to. Possible stale info from that last packet read in the read() function during summary display.

Ravi.

On 5/29/06, Raman Singla <ramans@xxxxxxxxxxxxxxxxxxx> wrote:

Thanks Mr. Ravi the problem is sorted out by this but i still can't figure out why is it so.

whereas pseudo_header-> or wtap->pseudo_header. is one & same thing

 

when i did with pseudo_header-> it worked out.

 

thank you Mr. Ravi.

----- Original Message -----

From: Ravi Kondamuru

To: Ethereal development

Sent: 2006 May 30 8:14 AM

Subject: Re: [Ethereal-dev] problem in pseudo header

seek_read() function has
   wtap* wth and union wtap_pseudo_header* pseudo_header
as arguments.

Make sure that in seek_read you are setting

pseudo_header.dec_hdr->step
and not
wtap->pseudo_header.dec_hdr->step

From your mail, it looks like you are setting in the wtap->pseudo_header.

thanks,
Ravi.

On 5/29/06, Raman Singla <ramans@xxxxxxxxxxxxxxxxxxx> wrote:

i read ur answer, see i m just using these values directly, like big/little endian or message_type.(depending on message type it will decode for that message.

 

in simple language - i have to get that pseudo header value in one variable in dissector while pseudo header is read through seek_read.

 

----- Original Message -----

From: Ravi Kondamuru

To: Ethereal development

Sent: 2006 May 30 3:10 AM

Subject: Re: [Ethereal-dev] problem in pseudo header

Raman,

Good question!! I had posted a similar problem sometime back.
http://www.ethereal.com/lists/ethereal-dev/200605/msg00149.html

After reading your question I just realized that the pseudo_header has to be re-populated all over again in the seek_read function. I was not doing it. Thanks for your question, I might have found just the problem I have been struggling with for last 2 weeks.

thanks,
Ravi.

On 5/29/06, Raman Singla <ramans@xxxxxxxxxxxxxxxxxxx> wrote:

hi all,

 

I m writing decoder for new capture format. (dectrace).

 

I have made a pseudo_header which will carry info of frame_no, sender,receiver etc.

 

in wiretap : in read function the i m loading pseudo_header with appropiate data & i m able to use this in dissector. (for column information etc)

 

the problem :

when i m loading pseudo_header in seek_read (it is showing correct info) e.g.

in wtap->pseudo_header.dec_hdr->step

but the same information in dissector is replaced by 0

e.g. value of pinfo->pseudo_header.dec_hdr->step is 0.

 

i m unable to understand why the same info if loaded through read is raching correct at dissector when the same is loaded from seek_read is replaced by 0 somewhere between exit of seek & entry to dissector.

 

regards

 

Raman
Ext - 1667

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