forked from osmocom/wireshark
802f4452b4
svn path=/trunk/; revision=26176
173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/* packet-llt.c
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* Routines for Veritas Low Latency Transport (LLT) dissection
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* Copyright 2006, Stephen Fisher <stephentfisher@yahoo.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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* 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/etypes.h>
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static const value_string message_type_vs[] = {
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{ 0x0a, "heartbeat" },
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{ 0, NULL}
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};
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/* Forward declaration we need below */
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void proto_reg_handoff_llt(void);
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/* Variables for our preferences */
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static guint preference_alternate_ethertype = 0x0;
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/* Initialize the protocol and registered fields */
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static int proto_llt = -1;
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static int hf_llt_cluster_num = -1;
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static int hf_llt_node_id = -1;
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static int hf_llt_message_type = -1;
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static int hf_llt_sequence_num = -1;
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static int hf_llt_message_time = -1;
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/* Initialize the subtree pointers */
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static gint ett_llt = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_llt(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=NULL;
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proto_tree *llt_tree=NULL;
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guint8 message_type;
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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, "LLT");
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message_type = tvb_get_guint8(tvb, 3);
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if(check_col(pinfo->cinfo, COL_INFO)) {
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col_clear(pinfo->cinfo, COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, "Message type: %s", val_to_str(message_type, message_type_vs, "Unknown (0x%02x)"));
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_llt, tvb, 0, -1, FALSE);
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llt_tree = proto_item_add_subtree(ti, ett_llt);
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}
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proto_tree_add_item(llt_tree, hf_llt_cluster_num, tvb, 2, 1, FALSE);
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proto_tree_add_item(llt_tree, hf_llt_message_type, tvb, 3, 1, FALSE);
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proto_tree_add_item(llt_tree, hf_llt_node_id, tvb, 7, 1, FALSE);
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proto_tree_add_item(llt_tree, hf_llt_sequence_num, tvb, 24, 4, FALSE);
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proto_tree_add_item(llt_tree, hf_llt_message_time, tvb, 40, 4, FALSE);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_llt(void)
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{
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module_t *llt_module;
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static hf_register_info hf[] = {
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{ &hf_llt_cluster_num, { "Cluster number", "llt.cluster_num",
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FT_UINT8, BASE_DEC, NULL, 0,
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"Cluster number that this node belongs to", HFILL } },
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{ &hf_llt_message_type, { "Message type", "llt.message_type",
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FT_UINT8, BASE_HEX, VALS(message_type_vs), 0,
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"Type of LLT message contained in this frame", HFILL } },
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{ &hf_llt_node_id, { "Node ID", "llt.node_id",
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FT_UINT8, BASE_DEC, NULL, 0,
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"Number identifying this node within the cluster", HFILL } },
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{ &hf_llt_sequence_num, { "Sequence number", "llt.sequence_num",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Sequence number of this frame", HFILL } },
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{ &hf_llt_message_time, { "Message time", "llt.message_time",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Number of ticks since this node was last rebooted", 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_llt,
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};
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/* Register the protocol name and description */
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proto_llt = proto_register_protocol("Veritas Low Latency Transport (LLT)", "LLT", "llt");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_llt, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register preferences module */
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llt_module = prefs_register_protocol(proto_llt, proto_reg_handoff_llt);
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/* Register our preferences */
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prefs_register_uint_preference(llt_module, "alternate_ethertype", "Alternate ethertype value",
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"Dissect this ethertype as LLT traffic in addition to the default, 0xCAFE.",
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16, &preference_alternate_ethertype); /* A base-16 (hexadecimal) value */
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}
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void
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proto_reg_handoff_llt(void)
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{
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static gboolean initialized = FALSE;
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static dissector_handle_t llt_handle;
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static guint preference_alternate_ethertype_last;
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if (!initialized) {
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llt_handle = create_dissector_handle(dissect_llt, proto_llt);
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dissector_add("ethertype", ETHERTYPE_LLT, llt_handle);
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initialized = TRUE;
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} else {
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if (preference_alternate_ethertype_last != 0x0) {
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dissector_delete("ethertype", preference_alternate_ethertype_last, llt_handle);
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}
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}
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/* Save the setting to see if it has changed later */
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preference_alternate_ethertype_last = preference_alternate_ethertype;
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if (preference_alternate_ethertype != 0x0) {
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/* Register the new ethertype setting */
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dissector_add("ethertype", preference_alternate_ethertype, llt_handle);
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}
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}
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