Wireshark-dev: Re: [Wireshark-dev] Add the next Tvb packet to current tvb before dissecting
From: Clifford Sibanda <[email protected]>
Date: Fri, 14 Aug 2009 05:40:50 -0700 (PDT)
Thanks Olivier

Actually I discovered the errors on storage class were because I placed the tcp_dissect function within my main dissect function so I have since moved it and at the moment I'm able to compile it right through with no error. Now I just need to figure out how to get my columns info and my protocol tree to reappear because now all I get is my packet in the TCP protocol tree and column information indicating that it is a TCP reassembled packet.


From: wsgd <[email protected]>
To: Developer support list for Wireshark <[email protected]>
Sent: Thursday, August 13, 2009 8:20:07 PM
Subject: Re: [Wireshark-dev] Add the next Tvb packet to current tvb before dissecting


The warning is saying that the parameter 'pinfo' is NOT used inside the
function.
It is not important.
Try this : "packet_info *pinfo _U_," instead of "packet_info *pinfo,"
(not sure that the warning will disappear).


The "storage" error ?
Absolutely not sure.
Try :
- remove the static keyword
- put the 2 functions in the same file where you call tcp_dissect_pdus
- put the 2 functions before the place where you call tcp_dissect_pdus
- do not declare function inside functions



Olivier


Clifford Sibanda a écrit :
>  Thank you Olivier for responding
>
> The reason why I attempted to do the reassemble the long way wa
> because using the tcp_dissect_pdus I get the following errors
>
> :647:error: invalid storage class for function 'dissect_l2i_message'
> for this line
> static void dissect_l2i_message(tvbuff_t *tvb, packet_info *pinfo,
> proto_tree *tree)
> {
>
> and same error for this line
> :652: error: invalid storage class for function 'get_l2i_message_len'
> for this line
> static guint get_l2i_message_len(packet_info *pinfo, tvbuff_t *tvb,
> int offset)
> {
>
> also
> a warning
>
> :651: warning: unused parameter 'pinfo'
>
> for the same line
> static guint get_l2i_message_len(packet_info *pinfo, tvbuff_t *tvb,
> int offset)
> {
>
> I'm not sure what it is that I'm doing wrong here
>
> I have taken note of void assignment by next_tvb=
> And i have removed it but I suppose if I can get the tcp_dissect_pdus
> to work for me the better because my protocol is running atop tcp.
>
> Regards
>
> Clifford
> ------------------------------------------------------------------------
> *From:* wsgd <[email protected]>
> *To:* Developer support list for Wireshark <[email protected]>
> *Sent:* Wednesday, August 12, 2009 8:27:38 PM
> *Subject:* Re: [Wireshark-dev] Add the next Tvb packet to current tvb
> before dissecting
>
> Hello,
>
> The displayed error says that tvb_set_child_real_data_tvbuff returns
> void (nothing).
> See epan/tvbuff.h
> So you are trying : next_tvb=void
>
>
> Other thing :
> I do not understand why you are trying to do reassembly by yourself
> since this is the goal of tcp_dissect_pdus.
>
>
>
> Olivier
>
>
>
> Clifford Sibanda a écrit :
> >
> > Good day
> >
> > I would like to get some assistance if anyone out there can.
> >
> > I am working a plugin dissector that handles data from an asynchronous
> > source. The asynchronous source first sends a packet with just the
> > message length of the next packet which contains the real data.
> >
> > What i would love to do is to keep this packet with just the length of
> > the next packet and append to it the next packet before I proceed with
> > dissecting.
> >
> > I have tried using the tcp_dissect_pdus and the longer reassembly
> > method but I get this error using both methods:
> >
> > error: void value not ignored as it ought to be
> >
> > for this line
> >
> > next_tvb=tvb_set_child_real_data_tvbuff(tvb,next_tvb);
> >
> > I'm not sure what it is that I'm doing wrong
> >
> > And if there is a simpler way of just adding the next tvb without
> > going the reassemble route I would like to use that one
> >
> > Thank you
> >
> > Clifford Sibanda
> > Good day
> >
> >
> > ------------------------------------------------------------------------
> >
> >
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