plugins/docsis/packet-regack.c

   1 /* packet-regack.c
   2  * Routines for Registration Acknowledge Message 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_regack = -1;
  32 static int hf_docsis_regack_sid = -1;
  33 static int hf_docsis_regack_response = -1;
  34 static dissector_handle_t docsis_tlv_handle;
  35
  36 /* Defined in packet-tlv.c */
  37 extern value_string docsis_conf_code[];
  38
  39 /* Initialize the subtree pointers */
  40 static gint ett_docsis_regack = -1;
  41
  42 /* Code to actually dissect the packets */
  43 static void
  44 dissect_regack (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  45 {
  46
  47   proto_item *it;
  48   proto_tree *regack_tree = NULL;
  49   guint16 sid;
  50   guint8 response;
  51   tvbuff_t *next_tvb;
  52
  53   sid = tvb_get_ntohs (tvb, 0);
  54   response = tvb_get_guint8 (tvb, 2);
  55
  56   col_add_fstr (pinfo->cinfo, COL_INFO,
  57             "Registration Acknowledge SID = %u (%s)", sid,
  58             val_to_str (response, docsis_conf_code, "%d"));
  59   if (tree)
  60     {
  61       it =
  62         proto_tree_add_protocol_format (tree, proto_docsis_regack, tvb, 0, -1,
  63                                         "Registration Acknowledge");
  64       regack_tree = proto_item_add_subtree (it, ett_docsis_regack);
  65       proto_tree_add_item (regack_tree, hf_docsis_regack_sid, tvb, 0, 2,
  66                            ENC_BIG_ENDIAN);
  67       proto_tree_add_item (regack_tree, hf_docsis_regack_response, tvb, 2, 1,
  68                            ENC_BIG_ENDIAN);
  69
  70     }
  71     /* Call Dissector for Appendix C TLV's */
  72     next_tvb = tvb_new_subset_remaining (tvb, 3);
  73     call_dissector (docsis_tlv_handle, next_tvb, pinfo, regack_tree);
  74
  75 }
  76
  77
  78
  79
  80 /* Register the protocol with Wireshark */
  81
  82 /* this format is require because a script is used to build the C function
  83    that calls all the protocol registration.
  84 */
  85
  86
  87 void
  88 proto_register_docsis_regack (void)
  89 {
  90
  91 /* Setup list of header fields  See Section 1.6.1 for details*/
  92   static hf_register_info hf[] = {
  93     {&hf_docsis_regack_sid,
  94      {"Service Identifier", "docsis_regack.sid",
  95       FT_UINT16, BASE_DEC, NULL, 0x0,
  96       NULL, HFILL}
  97      },
  98     {&hf_docsis_regack_response,
  99      {"Response Code", "docsis_regack.respnse",
 100       FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
 101       NULL, HFILL}
 102      },
 103   };
 104
 105 /* Setup protocol subtree array */
 106   static gint *ett[] = {
 107     &ett_docsis_regack,
 108   };
 109
 110 /* Register the protocol name and description */
 111   proto_docsis_regack =
 112     proto_register_protocol ("DOCSIS Registration Acknowledge",
 113                              "DOCSIS REG-ACK", "docsis_regack");
 114
 115 /* Required function calls to register the header fields and subtrees used */
 116   proto_register_field_array (proto_docsis_regack, hf, array_length (hf));
 117   proto_register_subtree_array (ett, array_length (ett));
 118
 119   register_dissector ("docsis_regack", dissect_regack, proto_docsis_regack);
 120 }
 121
 122
 123 /* If this dissector uses sub-dissector registration add a registration routine.
 124    This format is required because a script is used to find these routines and
 125    create the code that calls these routines.
 126 */
 127 void
 128 proto_reg_handoff_docsis_regack (void)
 129 {
 130   dissector_handle_t docsis_regack_handle;
 131
 132   docsis_regack_handle = find_dissector ("docsis_regack");
 133   docsis_tlv_handle = find_dissector ("docsis_tlv");
 134   dissector_add_uint ("docsis_mgmt", 0x0e, docsis_regack_handle);
 135
 136 }