Wireshark · Ethereal-dev: Re: [Ethereal-dev] can one plugin call another?

[Tomas Kukosa <tomas.kukosa@xxxxxxxxxxx>]

> In looking at the code there were two problems.  The first dissector 
> uses the proto_registrar_get_name() function.  

The proto_registrar_get_name() can be added to plugin API
(maybe, with all proto_registrar_*() functions).

> My second problem is that the second dissector calls the first.  This is 
> because the first protocol is sometime encapsulated in the second.  How 
> can this work if both are plugins?  I did not see this covered in the 
> readmes.

You can use all standard dissector calling mechanisms.
E.g.:
static void dissect_nu_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
  ...
  if (next_tvb) {
    if (q931_handle)
      call_dissector(q931_handle, next_tvb, pinfo, tree);
    else
      call_dissector(data_handle, next_tvb, pinfo, tree);
  }
}

void proto_reg_handoff_nu(void) {
  ...
  /* Find subdissectors */
  q931_handle = find_dissector("q931");
  data_handle = find_dissector("data");

}