Wireshark-dev: [Wireshark-dev] complex problem
From: Marcel Haas <inf462@xxxxxxxxxxx>
Date: Thu, 13 Oct 2011 11:40:01 +0200
Hey,
maybe the problem isnt so complex to solve but its complex for me to explain. :)

I have written my own reassemble code and it seems to work. But i have one big problem. If i set the filter and click apply, it works,because it goes trough every packet. And I get my reassemble msg after the packet but if now click at the reassemble packet there is now reassemble tvb. I know the reason for that cause he interpret every packet one on one

Example:
Filter is set click at Apply
Packet: 1 -frag
Packet: 2 -frag
Packet: 3 -Reassemble (last frag)
If i click at Packet 3 he interprets only packet 3. He doesnt see packet 1 2
and so he bulits now Reass Tvb.

Maybe im calling my function at the worng position.
Code:

static void
dissect_xxx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree){
        ...
        if(tree){
            ...
        }
// Fragment Routine------------------------------------------------------------------------------------
        if(totalp >1){
frag_tvb =tvb_new_subset(tvb,offset2,-1,-1); // Get the TVB

big_tvb=ListenElementEinfuegen(NeuesListenElement(snode,pnum,totalp,frag_tvb)); // Reass Function

                if (big_tvb) { // Reassembled  Big_tvb != NULL
                 col_append_str(pinfo->cinfo, COL_INFO,
                         " (Message Reassembled)");
add_new_data_source(pinfo,big_tvb,"Defrag TVB"); // ADD new Data Source

} else { // Not last packet of reassembled Short Message Big_tvb == NULL
                 col_append_fstr(pinfo->cinfo, COL_INFO,
                         " (Message fragment %u)", pnum);
                 col_append_fstr(pinfo->cinfo, COL_INFO,
                          " (Frag:  %u)", pinfo->fd -> num);
                 col_append_fstr(pinfo->cinfo, COL_INFO,
                           " (Visit:  %u)", pinfo->fd->flags.visited);
                }

        }
}

I hope someone understand my problem and have a good idea/solution :)

thx and regards
Marcel