Wireshark · Wireshark-dev: [Wireshark-dev] Single TCP segment having multiple PDUs not working

[Zongjun <qizongjun@xxxxxxxxx>]

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);
                                                                                                                                                             
      }
      printf("offset = %d\n", offset);
                                                                                                                                                             
      if(tvb_reported_length_remaining(tvb, offset) > 0)
        {
          printf("haha, we get a multiple PDU. \n");
        }
   } //while:
}