plugins/docsis/packet-uccrsp.c

   1 /* packet-uccrsp.c
   2  * Routines for Upstream Channel Change Response 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_uccrsp = -1;
  32 static int hf_docsis_uccrsp_upchid = -1;
  33
  34
  35 /* Initialize the subtree pointers */
  36 static gint ett_docsis_uccrsp = -1;
  37
  38 /* Code to actually dissect the packets */
  39 static void
  40 dissect_uccrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  41 {
  42
  43   proto_item *it;
  44   proto_tree *uccrsp_tree;
  45   guint8 chid;
  46
  47   chid = tvb_get_guint8 (tvb, 0);
  48
  49   col_add_fstr (pinfo->cinfo, COL_INFO,
  50             "Upstream Channel Change response  Channel ID = %u (U%u)",
  51             chid, (chid > 0 ? chid - 1 : chid));
  52
  53   if (tree)
  54     {
  55       it =
  56         proto_tree_add_protocol_format (tree, proto_docsis_uccrsp, tvb, 0, -1,
  57                                         "UCC Response");
  58       uccrsp_tree = proto_item_add_subtree (it, ett_docsis_uccrsp);
  59       proto_tree_add_item (uccrsp_tree, hf_docsis_uccrsp_upchid, tvb, 0, 1,
  60                            ENC_BIG_ENDIAN);
  61     }
  62
  63 }
  64
  65
  66
  67
  68 /* Register the protocol with Wireshark */
  69
  70 /* this format is require because a script is used to build the C function
  71    that calls all the protocol registration.
  72 */
  73
  74
  75 void
  76 proto_register_docsis_uccrsp (void)
  77 {
  78
  79 /* Setup list of header fields  See Section 1.6.1 for details*/
  80   static hf_register_info hf[] = {
  81     {&hf_docsis_uccrsp_upchid,
  82      {"Upstream Channel Id", "docsis_uccrsp.upchid",
  83       FT_UINT8, BASE_DEC, NULL, 0x0,
  84       NULL, HFILL}
  85      },
  86   };
  87
  88 /* Setup protocol subtree array */
  89   static gint *ett[] = {
  90     &ett_docsis_uccrsp,
  91   };
  92
  93 /* Register the protocol name and description */
  94   proto_docsis_uccrsp =
  95     proto_register_protocol ("DOCSIS Upstream Channel Change Response",
  96                              "DOCSIS UCC-RSP", "docsis_uccrsp");
  97
  98 /* Required function calls to register the header fields and subtrees used */
  99   proto_register_field_array (proto_docsis_uccrsp, hf, array_length (hf));
 100   proto_register_subtree_array (ett, array_length (ett));
 101
 102   register_dissector ("docsis_uccrsp", dissect_uccrsp, proto_docsis_uccrsp);
 103 }
 104
 105
 106 /* If this dissector uses sub-dissector registration add a registration routine.
 107    This format is required because a script is used to find these routines and
 108    create the code that calls these routines.
 109 */
 110 void
 111 proto_reg_handoff_docsis_uccrsp (void)
 112 {
 113   dissector_handle_t docsis_uccrsp_handle;
 114
 115   docsis_uccrsp_handle = find_dissector ("docsis_uccrsp");
 116   dissector_add_uint ("docsis_mgmt", 0x09, docsis_uccrsp_handle);
 117
 118 }