plugins/docsis/packet-dscrsp.c

   1 /* packet-dscrsp.c
   2  * Routines for Dynamic Service 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_dscrsp = -1;
  32 static int hf_docsis_dscrsp_tranid = -1;
  33 static int hf_docsis_dscrsp_response = -1;
  34 static dissector_handle_t docsis_tlv_handle;
  35
  36
  37 /* Initialize the subtree pointers */
  38 static gint ett_docsis_dscrsp = -1;
  39
  40 extern value_string docsis_conf_code[];
  41
  42 /* Code to actually dissect the packets */
  43 static void
  44 dissect_dscrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  45 {
  46
  47   proto_item *it;
  48   proto_tree *dscrsp_tree = NULL;
  49   guint16 transid;
  50   guint8 response;
  51   tvbuff_t *next_tvb;
  52
  53
  54   transid = tvb_get_ntohs (tvb, 0);
  55   response = tvb_get_guint8 (tvb, 2);
  56
  57   col_add_fstr (pinfo->cinfo, COL_INFO,
  58             "Dynamic Service Change Response ID = %u (%s)", transid,
  59             val_to_str (response, docsis_conf_code, "%d"));
  60
  61   if (tree)
  62     {
  63       it =
  64         proto_tree_add_protocol_format (tree, proto_docsis_dscrsp, tvb, 0, -1,
  65                                         "DSC Response");
  66       dscrsp_tree = proto_item_add_subtree (it, ett_docsis_dscrsp);
  67       proto_tree_add_item (dscrsp_tree, hf_docsis_dscrsp_tranid, tvb, 0, 2,
  68                            ENC_BIG_ENDIAN);
  69       proto_tree_add_item (dscrsp_tree, hf_docsis_dscrsp_response, tvb, 2, 1,
  70                            ENC_BIG_ENDIAN);
  71
  72     }
  73     /* Call Dissector for Appendix C TLV's */
  74     next_tvb = tvb_new_subset_remaining (tvb, 3);
  75     call_dissector (docsis_tlv_handle, next_tvb, pinfo, dscrsp_tree);
  76 }
  77
  78
  79
  80
  81 /* Register the protocol with Wireshark */
  82
  83 /* this format is require because a script is used to build the C function
  84    that calls all the protocol registration.
  85 */
  86
  87
  88 void
  89 proto_register_docsis_dscrsp (void)
  90 {
  91
  92 /* Setup list of header fields  See Section 1.6.1 for details*/
  93   static hf_register_info hf[] = {
  94     {&hf_docsis_dscrsp_tranid,
  95      {"Transaction Id", "docsis_dscrsp.tranid",
  96       FT_UINT16, BASE_DEC, NULL, 0x0,
  97       "Service Identifier", HFILL}
  98      },
  99     {&hf_docsis_dscrsp_response,
 100      {"Confirmation Code", "docsis_dscrsp.confcode",
 101       FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
 102       NULL, HFILL}
 103      },
 104   };
 105
 106 /* Setup protocol subtree array */
 107   static gint *ett[] = {
 108     &ett_docsis_dscrsp,
 109   };
 110
 111 /* Register the protocol name and description */
 112   proto_docsis_dscrsp =
 113     proto_register_protocol ("DOCSIS Dynamic Service Change Response",
 114                              "DOCSIS DSC-RSP", "docsis_dscrsp");
 115
 116 /* Required function calls to register the header fields and subtrees used */
 117   proto_register_field_array (proto_docsis_dscrsp, hf, array_length (hf));
 118   proto_register_subtree_array (ett, array_length (ett));
 119
 120   register_dissector ("docsis_dscrsp", dissect_dscrsp, proto_docsis_dscrsp);
 121 }
 122
 123
 124 /* If this dissector uses sub-dissector registration add a registration routine.
 125    This format is required because a script is used to find these routines and
 126    create the code that calls these routines.
 127 */
 128 void
 129 proto_reg_handoff_docsis_dscrsp (void)
 130 {
 131   dissector_handle_t docsis_dscrsp_handle;
 132
 133   docsis_dscrsp_handle = find_dissector ("docsis_dscrsp");
 134   docsis_tlv_handle = find_dissector ("docsis_tlv");
 135   dissector_add_uint ("docsis_mgmt", 0x13, docsis_dscrsp_handle);
 136
 137 }