plugins/docsis/packet-regreqmp.c

   1 /* packet-regreqmp.c
   2  * $Id$
   3  * Routines for REG-REQ-MP Message dissection
   4  * Copyright 2007, Bruno Verstuyft  <bruno.verstuyft@excentis.com>
   5  *
   6  * Based on packet-regreq.c (by Anand V. Narwani <anand[AT]narwani.org>)
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "config.h"
  28
  29 #include <epan/packet.h>
  30
  31
  32 /* Initialize the protocol and registered fields */
  33 static int proto_docsis_regreqmp = -1;
  34
  35 static int hf_docsis_regreqmp_sid = -1;
  36
  37 static int hf_docsis_regreqmp_number_of_fragments = -1;
  38 static int hf_docsis_regreqmp_fragment_sequence_number = -1;
  39
  40 static dissector_handle_t docsis_tlv_handle;
  41
  42
  43
  44 /* Initialize the subtree pointers */
  45 static gint ett_docsis_regreqmp = -1;
  46
  47 static void
  48 dissect_regreqmp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  49 {
  50
  51         proto_item *it;
  52         proto_tree *regreqmp_tree = NULL;
  53         tvbuff_t *next_tvb;
  54
  55         col_set_str(pinfo->cinfo, COL_INFO, "REG-REQ-MP Message:");
  56
  57                 if (tree)
  58                 {
  59                         it = proto_tree_add_protocol_format (tree, proto_docsis_regreqmp, tvb, 0, -1,"REG-REQ-MP Message");
  60                         regreqmp_tree = proto_item_add_subtree (it, ett_docsis_regreqmp);
  61
  62                         proto_tree_add_item (regreqmp_tree, hf_docsis_regreqmp_sid, tvb, 0, 2, ENC_BIG_ENDIAN);
  63                         proto_tree_add_item (regreqmp_tree, hf_docsis_regreqmp_number_of_fragments, tvb, 2, 1, ENC_BIG_ENDIAN);
  64                         proto_tree_add_item (regreqmp_tree, hf_docsis_regreqmp_fragment_sequence_number, tvb, 3, 1, ENC_BIG_ENDIAN);
  65
  66                 }
  67                 /* Call Dissector for Appendix C TLV's */
  68                 next_tvb = tvb_new_subset_remaining (tvb, 4);
  69                 call_dissector (docsis_tlv_handle, next_tvb, pinfo, regreqmp_tree);
  70         }
  71
  72
  73
  74
  75 /* Register the protocol with Wireshark */
  76
  77 /* this format is require because a script is used to build the C function
  78    that calls all the protocol registration.
  79 */
  80
  81
  82 void
  83 proto_register_docsis_regreqmp (void)
  84 {
  85         /* Setup list of header fields  See Section 1.6.1 for details*/
  86         static hf_register_info hf[] = {
  87                 {&hf_docsis_regreqmp_sid,
  88                 {"Sid", "docsis_regreqmp.sid",
  89                 FT_UINT16, BASE_DEC, NULL, 0x0,
  90                 "Reg-Req-Mp Sid", HFILL}
  91                 },
  92                 {&hf_docsis_regreqmp_number_of_fragments,
  93                 {"Number of Fragments", "docsis_regreqmp.number_of_fragments",
  94                 FT_UINT8, BASE_DEC, NULL, 0x0,
  95                 "Reg-Req-Mp Number of Fragments", HFILL}
  96                 },
  97                 {&hf_docsis_regreqmp_fragment_sequence_number,
  98                 {"Fragment Sequence Number", "docsis_regreqmp.fragment_sequence_number",
  99                 FT_UINT8, BASE_DEC, NULL, 0x0,
 100                 "Reg-Req-Mp Fragment Sequence Number", HFILL}
 101                 },
 102         };
 103
 104         /* Setup protocol subtree array */
 105         static gint *ett[] = {
 106                 &ett_docsis_regreqmp,
 107         };
 108
 109         /* Register the protocol name and description */
 110         proto_docsis_regreqmp =
 111                 proto_register_protocol ("DOCSIS Registration Request Multipart",
 112                                         "DOCSIS Reg-Req-Mp", "docsis_regreqmp");
 113
 114         /* Required function calls to register the header fields and subtrees used */
 115         proto_register_field_array (proto_docsis_regreqmp, hf, array_length (hf));
 116         proto_register_subtree_array (ett, array_length (ett));
 117
 118         register_dissector ("docsis_regreqmp", dissect_regreqmp, proto_docsis_regreqmp);
 119 }
 120
 121
 122 /* If this dissector uses sub-dissector registration add a registration routine.
 123    This format is required because a script is used to find these routines and
 124    create the code that calls these routines.
 125 */
 126 void
 127 proto_reg_handoff_docsis_regreqmp (void)
 128 {
 129         dissector_handle_t docsis_regreqmp_handle;
 130
 131         docsis_tlv_handle = find_dissector ("docsis_tlv");
 132         docsis_regreqmp_handle = find_dissector ("docsis_regreqmp");
 133         dissector_add_uint ("docsis_mgmt", 44, docsis_regreqmp_handle);
 134 }