plugins/docsis/packet-dscreq.c

   1 /* packet-dscreq.c
   2  * Routines for Dynamic Service Change Request dissection
   3  * Copyright 2002, Anand V. Narwani <anand[AT]narwani.org>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <epan/packet.h>
  29
  30 /* Initialize the protocol and registered fields */
  31 static int proto_docsis_dscreq = -1;
  32 static int hf_docsis_dscreq_tranid = -1;
  33 static dissector_handle_t docsis_tlv_handle;
  34
  35
  36 /* Initialize the subtree pointers */
  37 static gint ett_docsis_dscreq = -1;
  38
  39 /* Code to actually dissect the packets */
  40 static void
  41 dissect_dscreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  42 {
  43
  44   proto_item *it;
  45   proto_tree *dscreq_tree = NULL;
  46   guint16 transid;
  47   tvbuff_t *next_tvb;
  48
  49
  50   transid = tvb_get_ntohs (tvb, 0);
  51
  52   col_add_fstr (pinfo->cinfo, COL_INFO,
  53             "Dynamic Service Change Request Tran-id = %u", transid);
  54
  55   if (tree)
  56     {
  57       it =
  58         proto_tree_add_protocol_format (tree, proto_docsis_dscreq, tvb, 0, -1,
  59                                         "DSC Request");
  60       dscreq_tree = proto_item_add_subtree (it, ett_docsis_dscreq);
  61       proto_tree_add_item (dscreq_tree, hf_docsis_dscreq_tranid, tvb, 0, 2,
  62                            ENC_BIG_ENDIAN);
  63
  64     }
  65     /* Call dissector for Appendix C TLV's */
  66     next_tvb = tvb_new_subset_remaining (tvb, 2);
  67     call_dissector (docsis_tlv_handle, next_tvb, pinfo, dscreq_tree);
  68
  69 }
  70
  71
  72
  73
  74 /* Register the protocol with Wireshark */
  75
  76 /* this format is require because a script is used to build the C function
  77    that calls all the protocol registration.
  78 */
  79
  80
  81 void
  82 proto_register_docsis_dscreq (void)
  83 {
  84
  85 /* Setup list of header fields  See Section 1.6.1 for details*/
  86   static hf_register_info hf[] = {
  87     {&hf_docsis_dscreq_tranid,
  88      {"Transaction Id", "docsis_dscreq.tranid",
  89       FT_UINT16, BASE_DEC, NULL, 0x0,
  90       NULL, HFILL}
  91      },
  92   };
  93
  94 /* Setup protocol subtree array */
  95   static gint *ett[] = {
  96     &ett_docsis_dscreq,
  97   };
  98
  99 /* Register the protocol name and description */
 100   proto_docsis_dscreq =
 101     proto_register_protocol ("DOCSIS Dynamic Service Change Request",
 102                              "DOCSIS DSC-REQ", "docsis_dscreq");
 103
 104 /* Required function calls to register the header fields and subtrees used */
 105   proto_register_field_array (proto_docsis_dscreq, hf, array_length (hf));
 106   proto_register_subtree_array (ett, array_length (ett));
 107
 108   register_dissector ("docsis_dscreq", dissect_dscreq, proto_docsis_dscreq);
 109 }
 110
 111
 112 /* If this dissector uses sub-dissector registration add a registration routine.
 113    This format is required because a script is used to find these routines and
 114    create the code that calls these routines.
 115 */
 116 void
 117 proto_reg_handoff_docsis_dscreq (void)
 118 {
 119   dissector_handle_t docsis_dscreq_handle;
 120
 121   docsis_dscreq_handle = find_dissector ("docsis_dscreq");
 122   docsis_tlv_handle = find_dissector ("docsis_tlv");
 123   dissector_add_uint ("docsis_mgmt", 0x12, docsis_dscreq_handle);
 124
 125 }