plugins/docsis/packet-sync.c

   1 /* packet-sync.c
   2  * $Id$
   3  * Routines for Sync Message dissection
   4  * Copyright 2007, Bruno Verstuyft  <bruno.verstuyft@excentis.com>
   5  *
   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
  31 /* Initialize the protocol and registered fields */
  32 static int proto_docsis_sync = -1;
  33 static int hf_docsis_sync_cmts_timestamp = -1;
  34
  35
  36 /* Initialize the subtree pointers */
  37 static gint ett_docsis_sync = -1;
  38
  39 static void
  40 dissect_sync (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  41 {
  42         proto_item *it;
  43         proto_tree *sync_tree;
  44
  45         col_set_str(pinfo->cinfo, COL_INFO, "Sync Message:");
  46
  47         if (tree)
  48         {
  49         it = proto_tree_add_protocol_format (tree, proto_docsis_sync, tvb, 0, -1,"SYNC Message");
  50         sync_tree = proto_item_add_subtree (it, ett_docsis_sync);
  51
  52         proto_tree_add_item (sync_tree, hf_docsis_sync_cmts_timestamp, tvb, 0, 4,
  53                         ENC_BIG_ENDIAN);
  54         }                               /* if(tree) */
  55 }
  56
  57
  58
  59
  60 /* Register the protocol with Wireshark */
  61
  62 /* this format is require because a script is used to build the C function
  63    that calls all the protocol registration.
  64 */
  65
  66
  67 void
  68 proto_register_docsis_sync (void)
  69 {
  70         /* Setup list of header fields  See Section 1.6.1 for details*/
  71         static hf_register_info hf[] = {
  72                 {&hf_docsis_sync_cmts_timestamp,
  73                 {"CMTS Timestamp", "docsis_sync.cmts_timestamp",
  74                 FT_UINT32, BASE_DEC, NULL, 0x0,
  75                 "Sync CMTS Timestamp", HFILL}
  76                 },
  77         };
  78
  79         /* Setup protocol subtree array */
  80         static gint *ett[] = {
  81                 &ett_docsis_sync,
  82         };
  83
  84         /* Register the protocol name and description */
  85         proto_docsis_sync =
  86                 proto_register_protocol ("DOCSIS Synchronisation Message",
  87                                         "DOCSIS Sync", "docsis_sync");
  88
  89         /* Required function calls to register the header fields and subtrees used */
  90         proto_register_field_array (proto_docsis_sync, hf, array_length (hf));
  91         proto_register_subtree_array (ett, array_length (ett));
  92
  93         register_dissector ("docsis_sync", dissect_sync, proto_docsis_sync);
  94 }
  95
  96
  97 /* If this dissector uses sub-dissector registration add a registration routine.
  98    This format is required because a script is used to find these routines and
  99    create the code that calls these routines.
 100 */
 101 void
 102 proto_reg_handoff_docsis_sync (void)
 103 {
 104         dissector_handle_t docsis_sync_handle;
 105
 106         docsis_sync_handle = find_dissector ("docsis_sync");
 107         dissector_add_uint ("docsis_mgmt", 1, docsis_sync_handle);
 108 }