plugins/docsis/packet-rngreq.c

   1 /* packet-rngreq.c
   2  * Routines for Ranging Request 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
  31 /* Initialize the protocol and registered fields */
  32 static int proto_docsis_rngreq = -1;
  33 static int hf_docsis_rngreq_down_chid = -1;
  34 static int hf_docsis_rngreq_sid = -1;
  35 static int hf_docsis_rngreq_pend_compl = -1;
  36
  37
  38 /* Initialize the subtree pointers */
  39 static gint ett_docsis_rngreq = -1;
  40
  41 /* Code to actually dissect the packets */
  42 static void
  43 dissect_rngreq (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  44 {
  45   proto_item *it;
  46   proto_tree *rngreq_tree;
  47   guint16 sid;
  48
  49   sid = tvb_get_ntohs (tvb, 0);
  50
  51   if (sid > 0)
  52         col_add_fstr (pinfo->cinfo, COL_INFO, "Ranging Request: SID = %u",
  53                       sid);
  54   else
  55         col_set_str(pinfo->cinfo, COL_INFO, "Initial Ranging Request SID = 0");
  56
  57   if (tree)
  58     {
  59       it =
  60         proto_tree_add_protocol_format (tree, proto_docsis_rngreq, tvb, 0, -1,
  61                                         "Ranging Request");
  62       rngreq_tree = proto_item_add_subtree (it, ett_docsis_rngreq);
  63       proto_tree_add_item (rngreq_tree, hf_docsis_rngreq_sid, tvb, 0, 2,
  64                            ENC_BIG_ENDIAN);
  65       proto_tree_add_item (rngreq_tree, hf_docsis_rngreq_down_chid, tvb, 2, 1,
  66                            ENC_BIG_ENDIAN);
  67       proto_tree_add_item (rngreq_tree, hf_docsis_rngreq_pend_compl, tvb, 3,
  68                            1, ENC_BIG_ENDIAN);
  69     }
  70
  71
  72 }
  73
  74
  75
  76
  77 /* Register the protocol with Wireshark */
  78
  79 /* this format is require because a script is used to build the C function
  80    that calls all the protocol registration.
  81 */
  82
  83
  84 void
  85 proto_register_docsis_rngreq (void)
  86 {
  87
  88 /* Setup list of header fields  See Section 1.6.1 for details*/
  89   static hf_register_info hf[] = {
  90     {&hf_docsis_rngreq_sid,
  91      {"Service Identifier", "docsis_rngreq.sid",
  92       FT_UINT16, BASE_DEC, NULL, 0x0,
  93       NULL, HFILL}
  94      },
  95     {&hf_docsis_rngreq_down_chid,
  96      {"Downstream Channel ID", "docsis_rngreq.downchid",
  97       FT_UINT8, BASE_DEC, NULL, 0x0,
  98       NULL, HFILL}
  99      },
 100     {&hf_docsis_rngreq_pend_compl,
 101      {"Pending Till Complete", "docsis_rngreq.pendcomp",
 102       FT_UINT8, BASE_DEC, NULL, 0x0,
 103       "Upstream Channel ID", HFILL}
 104      },
 105
 106   };
 107
 108 /* Setup protocol subtree array */
 109   static gint *ett[] = {
 110     &ett_docsis_rngreq,
 111   };
 112
 113 /* Register the protocol name and description */
 114   proto_docsis_rngreq = proto_register_protocol ("DOCSIS Range Request Message",
 115                                                  "DOCSIS RNG-REQ",
 116                                                  "docsis_rngreq");
 117
 118 /* Required function calls to register the header fields and subtrees used */
 119   proto_register_field_array (proto_docsis_rngreq, hf, array_length (hf));
 120   proto_register_subtree_array (ett, array_length (ett));
 121
 122   register_dissector ("docsis_rngreq", dissect_rngreq, proto_docsis_rngreq);
 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_rngreq (void)
 132 {
 133   dissector_handle_t docsis_rngreq_handle;
 134
 135   docsis_rngreq_handle = find_dissector ("docsis_rngreq");
 136   dissector_add_uint ("docsis_mgmt", 0x04, docsis_rngreq_handle);
 137
 138 }