forked from osmocom/wireshark
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tvb_reported_length_remaining() can return -1; Localize a variable. svn path=/trunk/; revision=39836
199 lines
6.3 KiB
C
199 lines
6.3 KiB
C
/* packet-hsr.c
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* Routines for HSR dissection (IEC62439 Part 3)
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* Copyright 2009, Florian Reichert <refl[AT]zhaw.ch>
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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[AT]wireshark.org>
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* Copyright 1998 Gerald Combs
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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/**********************************************************/
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/* Lengths of fields within a HSR packet. */
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/**********************************************************/
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#define HSR_LSDU_PATH_LENGTH 2
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#define HSR_SEQUENZNR_LENGTH 2
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#define HSR_TOTAL_LENGTH 4
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/**********************************************************/
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/* Offsets of fields within a HSR packet. */
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/**********************************************************/
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#define HSR_PATH_OFFSET 0
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#define HSR_SEQUENZNR_OFFSET 2
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static const value_string hsr_laneid_vals[] = {
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{0, "Lane A"},
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{1, "Lane B"},
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{0, NULL}
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};
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/**********************************************************/
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/* Initialize the protocol and registered fields */
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/**********************************************************/
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static int proto_hsr = -1;
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/* Initialize supervision frame fields */
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static int hf_hsr_path = -1;
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static int hf_hsr_netid = -1;
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static int hf_hsr_laneid = -1;
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static int hf_hsr_lsdu_size = -1;
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static int hf_hsr_sequence_nr = -1;
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static int hf_type= -1;
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static dissector_table_t ethertype_subdissector_table;
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/* Initialize the subtree pointers */
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static gint ett_hsr_frame = -1;
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static dissector_handle_t data_handle;
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/* Code to actually dissect the packets */
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static void
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dissect_hsr_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *hsr_tree;
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tvbuff_t *next_tvb;
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guint16 etype;
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guint16 lsdu_size, lsdu_size_correct;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "HSR");
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col_set_str(pinfo->cinfo, COL_INFO, "HSR-Data Frame");
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_hsr, tvb, 0, HSR_TOTAL_LENGTH, ENC_NA);
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hsr_tree = proto_item_add_subtree(ti, ett_hsr_frame);
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proto_tree_add_item(hsr_tree, hf_hsr_path,
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tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
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proto_tree_add_item(hsr_tree, hf_hsr_netid,
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tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
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proto_tree_add_item(hsr_tree, hf_hsr_laneid,
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tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH , ENC_BIG_ENDIAN);
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lsdu_size = tvb_get_ntohs(tvb, HSR_PATH_OFFSET) & 0x0fff;
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lsdu_size_correct = tvb_reported_length_remaining(tvb, 0);
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if (lsdu_size == lsdu_size_correct) {
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proto_tree_add_uint_format(hsr_tree, hf_hsr_lsdu_size,
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tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH, lsdu_size,
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"LSDU size: %d [correct]", lsdu_size);
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} else {
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proto_tree_add_uint_format(hsr_tree, hf_hsr_lsdu_size,
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tvb, HSR_PATH_OFFSET, HSR_LSDU_PATH_LENGTH, lsdu_size,
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"LSDU size: %d [WRONG, should be %d]", lsdu_size, lsdu_size_correct);
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}
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proto_tree_add_item(hsr_tree, hf_hsr_sequence_nr,
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tvb, HSR_SEQUENZNR_OFFSET,HSR_SEQUENZNR_LENGTH, ENC_BIG_ENDIAN);
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proto_tree_add_item(hsr_tree, hf_type,
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tvb, HSR_TOTAL_LENGTH,2, ENC_BIG_ENDIAN);
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next_tvb = tvb_new_subset (tvb, HSR_TOTAL_LENGTH + 2, -1, -1);
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etype = tvb_get_ntohs(tvb, HSR_TOTAL_LENGTH);
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if (!dissector_try_uint(ethertype_subdissector_table, etype, next_tvb, pinfo, tree))
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call_dissector(data_handle, next_tvb, pinfo, hsr_tree);
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}
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/* Register the protocol with Wireshark */
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void proto_register_hsr(void)
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{
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static hf_register_info hf[] = {
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{ &hf_hsr_path,
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{ "Path", "hsr.path",
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FT_UINT16, BASE_DEC, NULL, 0xf000,
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NULL, HFILL }
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},
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{ &hf_hsr_netid,
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{ "Network id", "hsr.netid",
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FT_UINT16, BASE_DEC, NULL, 0xe000,
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NULL, HFILL }
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},
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{ &hf_hsr_laneid,
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{ "Lane id", "hsr.laneid",
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FT_UINT16, BASE_DEC, VALS(hsr_laneid_vals), 0x1000,
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NULL, HFILL }
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},
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{ &hf_hsr_lsdu_size,
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{ "LSDU size", "hsr.lsdu_size",
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FT_UINT16, BASE_DEC, NULL, 0x0fff,
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NULL, HFILL }
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},
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{ &hf_hsr_sequence_nr,
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{ "Sequence number", "hsr.hsr_sequence_nr",
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FT_UINT16, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_type,
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{ "Type", "hsr.type",
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FT_UINT16, BASE_HEX, VALS(etype_vals), 0x00,
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NULL, HFILL }
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}
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};
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static gint *ett[] = {
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&ett_hsr_frame,
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};
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/* Register the protocol name and description */
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proto_hsr = proto_register_protocol("High-availability Seamless Redundancy (IEC62439 Part 3 Chapter 5)",
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"HSR", "hsr");
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/* Required function calls to register the header fields and subtree used */
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proto_register_field_array(proto_hsr, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void proto_reg_handoff_hsr(void)
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{
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dissector_handle_t hsr_frame_handle;
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hsr_frame_handle = create_dissector_handle(dissect_hsr_frame, proto_hsr);
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dissector_add_uint("ethertype", ETHERTYPE_HSR, hsr_frame_handle);
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ethertype_subdissector_table = find_dissector_table("ethertype");
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data_handle = find_dissector("data");
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}
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