214 lines
7.6 KiB
C
214 lines
7.6 KiB
C
/* packet-wsmp.c
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* Routines for WAVE Short Message dissection (WSMP)
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* Copyright 2008, Arada Systems (http://www.aradasystems.com) (email: siva@aradasystems.com)
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from README.developer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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static dissector_handle_t data_handle;
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/* Initialize the protocol and registered fields */
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static int proto_wsmp = -1;
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static int hf_wsmp_version = -1;
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static int hf_wsmp_security = -1;
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static int hf_wsmp_rate = -1;
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static int hf_wsmp_channel = -1;
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static int hf_wsmp_txpower = -1;
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static int hf_wsmp_appclass = -1;
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static int hf_wsmp_acmlength = -1;
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static int hf_wsmp_acm = -1;
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static int hf_wsmp_wsmlength = -1;
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/* Initialize the subtree pointers */
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static gint ett_wsmp = -1;
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static gint ett_wsmdata = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_wsmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti, *wsmdata_item;
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proto_tree *wsmp_tree, *wsmdata_tree;
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tvbuff_t *wsmdata_tvb;
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guint16 acmlength, wsmlength, offset;
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char* acm;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "WSMP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "WAVE Short Message Protocol IEEE P1609.3");
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if (tree) {
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_wsmp, tvb, 0, -1, FALSE);
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wsmp_tree = proto_item_add_subtree(ti, ett_wsmp);
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offset = 0;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_version, tvb, offset, 1, FALSE);
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offset ++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_security, tvb, offset, 1, FALSE);
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offset ++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_channel, tvb, offset, 1, FALSE);
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offset ++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_rate, tvb, offset, 1, FALSE);
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offset ++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_txpower, tvb, offset, 1, FALSE);
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offset ++;
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_appclass, tvb, offset, 1, FALSE);
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offset ++;
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acmlength = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_acmlength, tvb, offset, 1, FALSE);
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offset ++;
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acm = tvb_get_ephemeral_string(tvb, offset, acmlength);
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proto_tree_add_item(wsmp_tree, hf_wsmp_acm, tvb, offset, acmlength, FALSE);
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offset +=acmlength;
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wsmlength = tvb_get_letohs( tvb, offset);
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proto_tree_add_item(wsmp_tree,
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hf_wsmp_wsmlength, tvb, offset, 2, TRUE);
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offset += 2;
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wsmdata_item = proto_tree_add_text (wsmp_tree, tvb, offset, wsmlength,
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"Wave Short Message");
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wsmdata_tree = proto_item_add_subtree(wsmdata_item, ett_wsmdata);
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/* TODO: Branch on the application context and display accordingly
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* Default call the data dissector
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*/
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wsmdata_tvb = tvb_new_subset(tvb, offset,wsmlength, wsmlength);
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call_dissector(data_handle, wsmdata_tvb, pinfo, wsmdata_tree);
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}
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}
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/* Register the protocol with Wireshark */
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_wsmp(void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_wsmp_version,
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{ "Version", "wsmp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_security,
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{ "Security", "wsmp.security", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_channel,
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{ "Channel", "wsmp.channel", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_rate,
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{ "Rate", "wsmp.rate", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_txpower,
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{ "Transmit power", "wsmp.txpower", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_appclass,
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{ "App class", "wsmp.appclass", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_acmlength,
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{ "Acm Length", "wsmp.acmlength", FT_UINT8, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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{ &hf_wsmp_acm,
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{ "Application Context Data", "wsmp.acm", FT_STRING,
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BASE_NONE, NULL, 0x0, "Acm", HFILL }},
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{ &hf_wsmp_wsmlength,
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{ "WSM Length", "wsmp.wsmlength", FT_UINT16, BASE_DEC, NULL, 0x0,
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"", HFILL }},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_wsmp,
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&ett_wsmdata,
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};
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/* Register the protocol name and description */
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proto_wsmp = proto_register_protocol("Wave Short Message Protocol(IEEE P1609.3)",
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"WSMP", "wsmp");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_wsmp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/* If this dissector uses sub-dissector registration add a registration routine.
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This exact format is required because a script is used to find these routines
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and create the code that calls these routines.
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*/
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void
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proto_reg_handoff_wsmp(void)
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{
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dissector_handle_t wsmp_handle;
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wsmp_handle = create_dissector_handle(dissect_wsmp, proto_wsmp);
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dissector_add("ethertype", ETHERTYPE_WSMP, wsmp_handle);
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data_handle = find_dissector("data");
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return;
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}
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