Building a protocol tree

[Paul Offord <Paul.Offord () advance7 com>]

I need some advice building a protocol tree.  I'm trying to build a tree like this:


  *   trb  - protocol
     *   Label of "TRB Header"
     *   trb.version - uint16
     *   trb.format - uint16
     *   trb.scheme_index - uint16
     *   trb.httpd - Boolean type but also introducing a subtree
        *   trb.httpd.host - string
        *   trb.httpd.identd - string
        *   etc.

I'm happy with creating the hf_register_info array, the problem I am having is with the various proto_tree_xxx calls.  
I currently have this:

    ti = proto_tree_add_item(tree, proto_trb, tvb, 0, -1, ENC_NA);
    trb_tree = proto_item_add_subtree(ti, ett_trb);
    tr_header_tree = proto_tree_add_subtree(trb_tree, tvb, tvb_offset, 16, ett_trb_header, NULL, "TRB Header");

    /* Add the Version to the tree */
    proto_tree_add_item(tr_header_tree, hf_id[0], tvb, tvb_offset, 2, ENC_LITTLE_ENDIAN);
    tvb_offset += 2;

    /* Add the Format to the tree */
    proto_tree_add_item(tr_header_tree, hf_id[1], tvb, tvb_offset, 2, ENC_LITTLE_ENDIAN);
    tvb_offset += 2;

    /* Add the Scheme Index to the tree */
    scheme_index = tvb_get_letohs(tvb, tvb_offset);
    proto_tree_add_item(tr_header_tree, hf_id[2], tvb, tvb_offset, 4, ENC_LITTLE_ENDIAN);
    tvb_offset += 2;

    tvb_offset += 2; /* Skip the Reserved field */
    tvb_offset += 8; /* Skip the Timestamp */

    // ToDo: before processing dsv data we need to add an item for the log data constructed from the protocol name
    // and the name space e.g. trb.httpd the subtree label should be name_space Log Data e.g. httpd Log Data
    trb_log_data = proto_tree_add_boolean(trb_tree, hf_id[3], tvb, 0, 0, 1);


I'm not sure what I need to do at the end of this block of code to successfully define my trb.httpd subtree.  The hf 
info for the last field is effectively:

    { p_id,
    { "httpd Log Data", "trb.httpd",
    FT_BOOLEAN, BASE_NONE, NULL, 0x0,
    "TRUE if TRB in the defined name space", HFILL } }

What am I doing wrong?

Thanks and regards...Paul



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