plugins/docsis/packet-dbcrsp.c

   1 /* packet-dbcrsp.c
   2  * Routines for DOCSIS 3.0 Dynamic Bonding Change Response Message dissection.
   3  * Copyright 2010, Guido Reismueller <g.reismueller[AT]avm.de>
   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 extern value_string docsis_conf_code[];
  31
  32 /* Initialize the protocol and registered fields */
  33 static int proto_docsis_dbcrsp = -1;
  34 static int hf_docsis_dbcrsp_tranid = -1;
  35 static int hf_docsis_dbcrsp_conf_code = -1;
  36 static dissector_handle_t docsis_tlv_handle;
  37
  38 /* Initialize the subtree pointers */
  39 static gint ett_docsis_dbcrsp = -1;
  40
  41 /* Code to actually dissect the packets */
  42 static void
  43 dissect_dbcrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  44 {
  45   proto_item *dbcrsp_item;
  46   proto_tree *dbcrsp_tree = NULL;
  47   guint16 transid;
  48   guint8 confcode;
  49   tvbuff_t *next_tvb;
  50
  51   transid = tvb_get_ntohs (tvb, 0);
  52   confcode = tvb_get_guint8 (tvb, 2);
  53
  54   col_add_fstr (pinfo->cinfo, COL_INFO,
  55             "Dynamic Bonding Change Response: Tran-Id = %u (%s)", transid,
  56                  val_to_str (confcode, docsis_conf_code, "%d"));
  57
  58   if (tree)
  59   {
  60     dbcrsp_item = proto_tree_add_protocol_format (tree, proto_docsis_dbcrsp,
  61                                                                                    tvb, 0, -1,
  62                                                                                    "Dynamic Bonding Change Response");
  63     dbcrsp_tree = proto_item_add_subtree (dbcrsp_item, ett_docsis_dbcrsp);
  64     proto_tree_add_item (dbcrsp_tree, hf_docsis_dbcrsp_tranid,
  65                                                    tvb, 0, 2, ENC_BIG_ENDIAN);
  66     proto_tree_add_item( dbcrsp_tree, hf_docsis_dbcrsp_conf_code,
  67                                                    tvb, 2, 1, ENC_BIG_ENDIAN );
  68   }
  69   /* Call Dissector for Appendix C TLV's */
  70   next_tvb = tvb_new_subset_remaining (tvb, 3);
  71   call_dissector (docsis_tlv_handle, next_tvb, pinfo, dbcrsp_tree);
  72 }
  73
  74 /* Register the protocol with Wireshark */
  75
  76 /*
  77  * this format is required because a script is used to build the C function
  78  * that calls all the protocol registration.
  79  */
  80 void
  81 proto_register_docsis_dbcrsp (void)
  82 {
  83   /* Setup list of header fields  See Section 1.6.1 for details*/
  84   static hf_register_info hf[] = {
  85     {&hf_docsis_dbcrsp_tranid,
  86      {"Transaction Id", "docsis_dbcrsp.tranid",
  87       FT_UINT16, BASE_DEC, NULL, 0x0,
  88       NULL, HFILL}
  89      },
  90     {&hf_docsis_dbcrsp_conf_code,
  91      {"Confirmation Code", "docsis_dbcrsp.conf_code",
  92       FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
  93       NULL, HFILL}
  94     },
  95   };
  96
  97 /* Setup protocol subtree array */
  98   static gint *ett[] = {
  99     &ett_docsis_dbcrsp,
 100   };
 101
 102 /* Register the protocol name and description */
 103   proto_docsis_dbcrsp = proto_register_protocol ("DOCSIS Dynamic Bonding Change Response",
 104                                                  "DOCSIS DBC-RSP",
 105                                                  "docsis_dbcrsp");
 106
 107 /* Required function calls to register the header fields and subtrees used */
 108   proto_register_field_array (proto_docsis_dbcrsp, hf, array_length (hf));
 109   proto_register_subtree_array (ett, array_length (ett));
 110
 111   register_dissector ("docsis_dbcrsp", dissect_dbcrsp, proto_docsis_dbcrsp);
 112 }
 113
 114
 115 /* If this dissector uses sub-dissector registration add a registration routine.
 116    This format is required because a script is used to find these routines and
 117    create the code that calls these routines.
 118 */
 119 void
 120 proto_reg_handoff_docsis_dbcrsp (void)
 121 {
 122   dissector_handle_t docsis_dbcrsp_handle;
 123
 124   docsis_dbcrsp_handle = find_dissector ("docsis_dbcrsp");
 125   docsis_tlv_handle = find_dissector ("docsis_tlv");
 126   dissector_add_uint ("docsis_mgmt", 0x25, docsis_dbcrsp_handle);
 127 }