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/* packet-rdm.c
* Routines for RDM packet disassembly
*
* $Id$
*
* Copyright (c) 2003 by Erwin Rol <erwin@erwinrol.com>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1999 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* Include files */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/addr_resolv.h>
#include <epan/etypes.h>
#include <epan/strutil.h>
/*
* See http://www.esta.org/tsp/E1-20inst.htm
*
*/
void proto_reg_handoff_rdm(void);
/* Define the rdm proto */
static int proto_rdm = -1;
/* Header */
static int hf_rdm_sub_start_code = -1;
static int hf_rdm_slot_count = -1;
static int hf_rdm_dest_uid = -1;
static int hf_rdm_src_uid = -1;
static int hf_rdm_seq_nr = -1;
static int hf_rdm_res_type = -1;
static int hf_rdm_msg_count = -1;
static int hf_rdm_sub_device = -1;
static int hf_rdm_mdb = -1;
static int hf_rdm_checksum = -1;
/* Define the tree for rdm */
static int ett_rdm = -1;
static void
dissect_rdm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
gint offset = 0, start_offset,i;
guint16 checksum,calc_checksum;
gint mdb_size;
proto_tree *ti=NULL,*rdm_tree=NULL;
proto_item* item;
/* Set the protocol column */
if(check_col(pinfo->cinfo,COL_PROTOCOL)){
col_set_str(pinfo->cinfo,COL_PROTOCOL,"RDM");
}
/* Clear out stuff in the info column */
if(check_col(pinfo->cinfo,COL_INFO)){
col_clear(pinfo->cinfo,COL_INFO);
}
if (tree) {
ti = proto_tree_add_item(tree, proto_rdm, tvb, offset, -1, FALSE);
rdm_tree = proto_item_add_subtree(ti, ett_rdm);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
"RDM");
}
if (tree)
{
start_offset = offset;
proto_tree_add_item(rdm_tree, hf_rdm_sub_start_code, tvb,
offset, 1, FALSE);
offset += 1;
mdb_size = tvb_get_guint8(tvb, offset) - 19;
if (mdb_size < 20) {
proto_tree_add_text(rdm_tree, tvb, offset, 1, "Invalid MDB size: %d",
mdb_size + 19);
return;
}
proto_tree_add_item(rdm_tree, hf_rdm_slot_count, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(rdm_tree, hf_rdm_dest_uid, tvb,
offset, 6, FALSE);
offset += 6;
proto_tree_add_item(rdm_tree, hf_rdm_src_uid, tvb,
offset, 6, FALSE);
offset += 6;
proto_tree_add_item(rdm_tree, hf_rdm_seq_nr, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(rdm_tree, hf_rdm_res_type, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(rdm_tree, hf_rdm_msg_count, tvb,
offset, 1, FALSE);
offset += 1;
proto_tree_add_item(rdm_tree, hf_rdm_sub_device, tvb,
offset, 1, FALSE);
offset += 1;
tvb_ensure_bytes_exist(tvb, offset, mdb_size);
proto_tree_add_item(rdm_tree, hf_rdm_mdb, tvb,
offset, mdb_size, FALSE);
offset += mdb_size;
calc_checksum = 0x00f0;
for( i = start_offset; i < offset; i++)
{
calc_checksum += tvb_get_guint8( tvb, i );
}
checksum = tvb_get_ntohs( tvb, offset );
item = proto_tree_add_item(rdm_tree, hf_rdm_checksum, tvb,
offset, 2, FALSE);
if( calc_checksum != checksum )
proto_item_append_text( item, " ( INCORRECT should be 0x%04x )", calc_checksum );
else
proto_item_append_text( item, " ( CORRECT )" );
offset += 2;
}
}
void
proto_register_rdm(void) {
static hf_register_info hf[] = {
{ &hf_rdm_sub_start_code,
{ "Sub Start Code",
"rdm.sub_start_code",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Sub Start Code", HFILL }},
{ &hf_rdm_slot_count,
{ "Slot Count",
"rdm.slot_count",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Slot Count", HFILL }},
{ &hf_rdm_dest_uid,
{ "Dest. UID",
"rdm.dest_uid",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Dest. UID", HFILL }},
{ &hf_rdm_src_uid,
{ "Source UID",
"rdm.src_uid",
FT_BYTES, BASE_HEX, NULL, 0x0,
"Source UID", HFILL }},
{ &hf_rdm_seq_nr,
{ "Sequence Number",
"rdm.seq_nr",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Sequence Number", HFILL }},
{ &hf_rdm_res_type,
{ "Response Type",
"rdm.res_type",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Response Type", HFILL }},
{ &hf_rdm_msg_count,
{ "Message Count",
"rdm.msg_count",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Message Count", HFILL }},
{ &hf_rdm_sub_device,
{ "Sub Device",
"rdm.sub_device",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Sub Device", HFILL }},
{ &hf_rdm_mdb,
{ "MDB",
"rdm.mdb",
FT_BYTES, BASE_HEX, NULL, 0x0,
"MDB", HFILL }},
{ &hf_rdm_checksum,
{ "Checksum",
"rdm.checksum",
FT_UINT16, BASE_HEX, NULL, 0x0,
"Checksum", HFILL }}
};
static gint *ett[] = {
&ett_rdm,
};
proto_rdm = proto_register_protocol("RDM","RDM","rdm");
proto_register_field_array(proto_rdm,hf,array_length(hf));
proto_register_subtree_array(ett,array_length(ett));
register_dissector("rdm", dissect_rdm, proto_rdm);
}
/* The registration hand-off routing */
void
proto_reg_handoff_rdm(void) {
static int rdm_initialized = FALSE;
static dissector_handle_t rdm_handle;
if(!rdm_initialized) {
rdm_handle = create_dissector_handle(dissect_rdm,proto_rdm);
rdm_initialized = TRUE;
} else {
dissector_delete("udp.port",0,rdm_handle);
}
dissector_add("udp.port",0,rdm_handle);
}
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