On Thu, 27 Sep 2007 13:13:17 -0700, Zongjun wrote
> On 9/27/07, Zongjun <[EMAIL PROTECTED]> wrote:Hey Didier,
>
> You mean like
>
> gint offset_thisRound = 0; // of course, outside if(tree)block.
>
> if (tree) {
> myproto_item = proto_tree_add_item(tree, proto_myproto, tvb, offset,
> -1, FALSE);
> myproto_tree = proto_item_add_subtree(myproto_item, ett_myproto);
> offset_thisRound = dissect_MyProtoMessage_PDU(tvb,pinfo,myproto_tree);
> }
> offset += offset_thisRound;
>
> I tried but still the same result.No you have to:
1) compute offset_thisRound outside 'if (tree)' otherwise you'll get and
endless loop if tree is null, if you unset coloring and reload the file for
example.
2) call dissect_MyProtoMessage_PDU with the new offset.
while(...) {
offset_thisRound = dissect_MyProtoMessage_PDU(tvb,pinfo,offset, tree);
offset += offset_thisRound;
}
3) IMO myproto_item = proto_tree_add_item(tree, proto_myproto, tvb, offset, -1,
FALSE); should be outside the loop, inside it breaks the protocol hierarchy
statistic.
Thanks,Zongjun
>
>
> On 9/27/07, Didier <[EMAIL PROTECTED]> wrote:
>
> Hi
> On Thu, 27 Sep 2007 12:02:32 -0700, Zongjun wrote
> > Hey guys,
> >
> > According to my capture, I don't have situations where ONE PDU spans over
> > multiple TCP segment. In stead, mine is the other round: Single segment
> > having multiple PDUs.
> >
> > But using the folling code, what I observed is wireshark did put multiple
> > PDU info inside the Detail Window after TCP, however these PDUs are always
> > the same. But in the bottom hexdump window, they are definitely from
> > different PDU.
> >
> > I noticed there has been a similar issue before Wireshark-dev: Re:
> > [Wireshark-dev] Dissect multiple PDUs in one TCP Segment.
> > But again, it is not for single segment having multiple PDU.
> >
> > Anyone see the same issue?
> >
> > Thanks,
> > Zongjun
> >
> > static void
> > dissect_myproto(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
> > {
> > gint offset = 0; // always points to the front
> > gint available = 0; // how many bytes still available to consume
> >
> > while((available = tvb_reported_length_remaining(tvb, offset)) > 0)
> > {
> > printf("available = %d\n", available);
> >
> >
> > /* make entry in the Protocol column on summary display */
> > if (check_col(pinfo->cinfo, COL_PROTOCOL))
> > col_set_str(pinfo->cinfo, COL_PROTOCOL, PSNAME);
> >
> > /* create the myproto protocol tree */
> > if (tree) {
>
> > myproto_item = proto_tree_add_item(tree, proto_myproto, tvb,
> > offset, -1, FALSE);
> >
> >
> > myproto_tree = proto_item_add_subtree(myproto_item, ett_myproto);
> >
> > offset += dissect_MyProtoMessage_PDU(tvb,pinfo,myproto_tree);
> offset computation should always be outside if (tree) block .
> >
> >
> > }
> > printf("offset = %d\n", offset);
> >
> >
> > if(tvb_reported_length_remaining(tvb, offset) > 0)
> > {
> > printf("haha, we get a multiple PDU. \n");
> > }
> > } //while:
> > }
>
>
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>
>
>
> --
> Thanks,
> Zongjun
>
> --
> Thanks,
> Zongjun
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