plugins/docsis/packet-dsarsp.c

   1 /* packet-dsarsp.c
   2  * Routines for Dynamic Service Addition 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_dsarsp = -1;
  32 static int hf_docsis_dsarsp_tranid = -1;
  33 static int hf_docsis_dsarsp_response = -1;
  34 static dissector_handle_t docsis_tlv_handle;
  35
  36
  37 /* Initialize the subtree pointers */
  38 static gint ett_docsis_dsarsp = -1;
  39
  40 extern value_string docsis_conf_code[];
  41
  42 /* Code to actually dissect the packets */
  43 static void
  44 dissect_dsarsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  45 {
  46
  47   proto_item *it;
  48   proto_tree *dsarsp_tree = NULL;
  49   guint16 transid;
  50   guint8 response;
  51   tvbuff_t *next_tvb;
  52
  53   transid = tvb_get_ntohs (tvb, 0);
  54   response = tvb_get_guint8 (tvb, 2);
  55
  56   col_add_fstr (pinfo->cinfo, COL_INFO,
  57             "Dynamic Service Add Response ID = %u (%s)", transid,
  58             val_to_str (response, docsis_conf_code, "%d"));
  59
  60   if (tree)
  61     {
  62       it =
  63         proto_tree_add_protocol_format (tree, proto_docsis_dsarsp, tvb, 0, -1,
  64                                         "DSA Response");
  65       dsarsp_tree = proto_item_add_subtree (it, ett_docsis_dsarsp);
  66       proto_tree_add_item (dsarsp_tree, hf_docsis_dsarsp_tranid, tvb, 0, 2,
  67                            ENC_BIG_ENDIAN);
  68       proto_tree_add_item (dsarsp_tree, hf_docsis_dsarsp_response, tvb, 2, 1,
  69                            ENC_BIG_ENDIAN);
  70
  71     }
  72     /* Call dissector for Appendix C TLV's */
  73     next_tvb = tvb_new_subset_remaining (tvb, 3);
  74     call_dissector (docsis_tlv_handle, next_tvb, pinfo, dsarsp_tree);
  75
  76
  77
  78 }
  79
  80
  81
  82
  83 /* Register the protocol with Wireshark */
  84
  85 /* this format is require because a script is used to build the C function
  86    that calls all the protocol registration.
  87 */
  88
  89
  90 void
  91 proto_register_docsis_dsarsp (void)
  92 {
  93
  94 /* Setup list of header fields  See Section 1.6.1 for details*/
  95   static hf_register_info hf[] = {
  96     {&hf_docsis_dsarsp_tranid,
  97      {"Transaction Id", "docsis_dsarsp.tranid",
  98       FT_UINT16, BASE_DEC, NULL, 0x0,
  99       "Service Identifier", HFILL}
 100      },
 101     {&hf_docsis_dsarsp_response,
 102      {"Confirmation Code", "docsis_dsarsp.confcode",
 103       FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
 104       NULL, HFILL}
 105      },
 106   };
 107
 108 /* Setup protocol subtree array */
 109   static gint *ett[] = {
 110     &ett_docsis_dsarsp,
 111   };
 112
 113 /* Register the protocol name and description */
 114   proto_docsis_dsarsp =
 115     proto_register_protocol ("DOCSIS Dynamic Service Addition Response",
 116                              "DOCSIS DSA-RSP", "docsis_dsarsp");
 117
 118 /* Required function calls to register the header fields and subtrees used */
 119   proto_register_field_array (proto_docsis_dsarsp, hf, array_length (hf));
 120   proto_register_subtree_array (ett, array_length (ett));
 121
 122   register_dissector ("docsis_dsarsp", dissect_dsarsp, proto_docsis_dsarsp);
 123 }
 124
 125
 126 /* If this dissector uses sub-dissector registration add a registration routine.
 127    This format is required because a script is used to find these routines and
 128    create the code that calls these routines.
 129 */
 130 void
 131 proto_reg_handoff_docsis_dsarsp (void)
 132 {
 133   dissector_handle_t docsis_dsarsp_handle;
 134
 135   docsis_dsarsp_handle = find_dissector ("docsis_dsarsp");
 136   docsis_tlv_handle = find_dissector ("docsis_tlv");
 137   dissector_add_uint ("docsis_mgmt", 0x10, docsis_dsarsp_handle);
 138
 139 }