epan/dissectors/packet-telkonet.c

   1 /* packet-telkonet.c
   2  * Routines for ethertype 0x88A1 tunneling dissection
   3  *
   4  * $Id$
   5  *
   6  * Copyright 2006 Joerg Mayer (see AUTHORS file)
   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 /* 2do:
  28  * - find out more about the real meaning of the 8 bytes
  29  *   and possible other packet types
  30  * - Telkonet (www.telkonet.com) has registered other ethertypes
  31  *   as well: find out what they do
  32  */
  33
  34 #include "config.h"
  35
  36 #include <glib.h>
  37 #include <epan/packet.h>
  38 #include <epan/etypes.h>
  39
  40 static int proto_telkonet = -1;
  41 static int hf_telkonet_type = -1;
  42
  43 static gint ett_telkonet = -1;
  44
  45 static dissector_handle_t eth_withoutfcs_handle;
  46
  47 typedef enum {
  48         TELKONET_TYPE_TUNNEL = 0x78
  49 } telkonet_type_t;
  50
  51 static const value_string telkonet_type_vals[] = {
  52         { TELKONET_TYPE_TUNNEL, "tunnel" },
  53
  54         { 0x00, NULL }
  55 };
  56
  57 static void
  58 dissect_telkonet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  59 {
  60         proto_tree *ti, *telkonet_tree;
  61         int offset = 0;
  62         telkonet_type_t type;
  63
  64         col_set_str(pinfo->cinfo, COL_PROTOCOL, "TELKONET");
  65         col_clear(pinfo->cinfo, COL_INFO);
  66
  67         type = (telkonet_type_t)tvb_get_guint8(tvb, offset);
  68         col_add_fstr(pinfo->cinfo, COL_INFO, "Telkonet type: %s",
  69                 val_to_str(type, telkonet_type_vals, "Unknown (0x%02x)"));
  70
  71         ti = proto_tree_add_item(tree, proto_telkonet, tvb, 0, 8, ENC_NA);
  72         telkonet_tree = proto_item_add_subtree(ti, ett_telkonet);
  73
  74         proto_tree_add_item(telkonet_tree, hf_telkonet_type, tvb, 0, 8, ENC_NA);
  75         offset += 8;
  76
  77         if (type == TELKONET_TYPE_TUNNEL)
  78                 call_dissector(eth_withoutfcs_handle, tvb_new_subset_remaining(tvb, offset),
  79                         pinfo, tree);
  80 }
  81
  82 void
  83 proto_register_telkonet(void)
  84 {
  85         static hf_register_info hf[] = {
  86                 { &hf_telkonet_type,
  87                 { "Type", "telkonet.type", FT_BYTES, BASE_NONE, NULL,
  88                         0x0, "TELKONET type", HFILL }},
  89         };
  90         static gint *ett[] = {
  91                 &ett_telkonet,
  92         };
  93
  94         proto_telkonet = proto_register_protocol("Telkonet powerline", "TELKONET", "telkonet");
  95         proto_register_field_array(proto_telkonet, hf, array_length(hf));
  96         proto_register_subtree_array(ett, array_length(ett));
  97 }
  98
  99 void
 100 proto_reg_handoff_telkonet(void)
 101 {
 102         dissector_handle_t telkonet_handle;
 103
 104         eth_withoutfcs_handle = find_dissector("eth_withoutfcs");
 105
 106         telkonet_handle = create_dissector_handle(dissect_telkonet, proto_telkonet);
 107         dissector_add_uint("ethertype", ETHERTYPE_TELKONET, telkonet_handle);
 108 }