forked from osmocom/wireshark
175 lines
5.8 KiB
C
175 lines
5.8 KiB
C
/* packet-dec-bpdu.c
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* Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly
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*
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* $Id: packet-dec-bpdu.c,v 1.7 2001/03/15 09:11:00 guy Exp $
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*
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* Copyright 2001 Paul Ionescu <paul@acorp.ro>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "resolv.h"
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#include "etypes.h"
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#include "ppptypes.h"
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/* Offsets of fields within a BPDU */
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#define BPDU_DEC_CODE 0
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#define BPDU_TYPE 1
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#define BPDU_VERSION 2
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#define BPDU_FLAGS 3
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#define BPDU_ROOT_PRI 4
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#define BPDU_ROOT_MAC 6
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#define BPDU_ROOT_PATH_COST 12
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#define BPDU_BRIDGE_PRI 14
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#define BPDU_BRIDGE_MAC 16
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#define BPDU_PORT_IDENTIFIER 22
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#define BPDU_MESSAGE_AGE 23
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#define BPDU_HELLO_TIME 24
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#define BPDU_MAX_AGE 25
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#define BPDU_FORWARD_DELAY 26
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#define DEC_BPDU_SIZE 27
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static int proto_dec_bpdu = -1;
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static gint ett_dec_bpdu = -1;
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static void
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dissect_dec_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
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guint8 protocol_identifier;
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guint8 protocol_version;
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guint8 bpdu_type;
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guint8 flags;
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proto_tree *bpdu_tree;
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proto_item *ti;
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if (check_col(pinfo->fd, COL_PROTOCOL)) {
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col_set_str(pinfo->fd, COL_PROTOCOL, "DEC_STP");
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}
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if (check_col(pinfo->fd, COL_INFO)) {
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col_clear(pinfo->fd, COL_INFO);
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}
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bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE);
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flags=tvb_get_guint8(tvb,BPDU_FLAGS);
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if (check_col(pinfo->fd, COL_INFO)) {
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if (bpdu_type == 25)
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col_add_fstr(pinfo->fd, COL_INFO, "Hello Packet");
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else if (bpdu_type == 0x02)
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col_add_fstr(pinfo->fd, COL_INFO, "Topology Change Notification");
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}
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tvb_set_reported_length(tvb, DEC_BPDU_SIZE);
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if (tree) {
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protocol_identifier = tvb_get_guint8(tvb, BPDU_DEC_CODE);
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protocol_version = tvb_get_guint8(tvb, BPDU_VERSION);
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ti = proto_tree_add_protocol_format(tree, proto_dec_bpdu, tvb, 0, DEC_BPDU_SIZE,
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"DEC Spanning Tree Protocol");
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bpdu_tree = proto_item_add_subtree(ti, ett_dec_bpdu);
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proto_tree_add_text(bpdu_tree, tvb, BPDU_DEC_CODE, 1, "Protocol ID: 0x%02x (%s)",
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protocol_identifier,
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protocol_identifier==0xe1?"DEC Spanning Tree Protocol":
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"Unknown protocol, the dissection may be wrong");
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proto_tree_add_text(bpdu_tree, tvb, BPDU_TYPE,1, "BPDU Type: %u (%s)", bpdu_type,
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(bpdu_type==25?"Hello Packet":(bpdu_type==2?"Topology change notice":"Unknown")));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION,1, "BPDU Version: %u (%s)",
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protocol_version,protocol_version==1?"DEC STP Version 1":"Unknown Version");
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proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS,1, "Flags: 0x%02x",flags);
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if (flags & 0x80)
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proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " 1... .... Use short timers");
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if (flags & 0x02)
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proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " .... ..1. Topology Change Acknowledgment");
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if (flags & 0x01)
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proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " .... ...1 Topology Change");
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proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_PRI,2, "Root priority: %u",
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tvb_get_ntohs(tvb,BPDU_ROOT_PRI));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_MAC,6, "Root MAC: %s",
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ether_to_str(tvb_get_ptr(tvb,BPDU_ROOT_MAC,6)));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_PATH_COST,2, "Root path cost: %u",
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tvb_get_ntohs(tvb,BPDU_ROOT_PATH_COST));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_BRIDGE_PRI,2, "Root priority: %u",
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tvb_get_ntohs(tvb,BPDU_BRIDGE_PRI));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_BRIDGE_MAC,6, "Root MAC: %s",
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ether_to_str(tvb_get_ptr(tvb,BPDU_BRIDGE_MAC,6)));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_PORT_IDENTIFIER,1, "Port identifier: %u",
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tvb_get_guint8(tvb,BPDU_PORT_IDENTIFIER));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_MESSAGE_AGE,1, "Age: %u",
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tvb_get_guint8(tvb,BPDU_MESSAGE_AGE));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_HELLO_TIME,1, "Hello time: %u",
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tvb_get_guint8(tvb,BPDU_HELLO_TIME));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_MAX_AGE,1, "Max Age: %u",
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tvb_get_guint8(tvb,BPDU_MAX_AGE));
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proto_tree_add_text(bpdu_tree, tvb, BPDU_FORWARD_DELAY,1, "Forward Delay: %u",
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tvb_get_guint8(tvb,BPDU_FORWARD_DELAY));
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}
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}
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void
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proto_register_dec_bpdu(void)
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{
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static gint *ett[] = {
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&ett_dec_bpdu,
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};
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proto_dec_bpdu = proto_register_protocol("DEC Spanning Tree Protocol",
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"DEC_STP", "dec_stp");
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_dec_bpdu(void)
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{
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dissector_add("ethertype", ETHERTYPE_DEC_LB, dissect_dec_bpdu,
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proto_dec_bpdu);
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dissector_add("chdlctype", ETHERTYPE_DEC_LB, dissect_dec_bpdu,
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proto_dec_bpdu);
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dissector_add("ppp.protocol", PPP_DEC_LB, dissect_dec_bpdu,
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proto_dec_bpdu);
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}
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