From 499a830af64b831dabaa3269b63cbf07eee1a23a Mon Sep 17 00:00:00 2001 From: Guy Harris Date: Fri, 5 Jan 2001 19:00:37 +0000 Subject: DEC LANBridge Spanning Tree Protocol support, from Paul Ionescu. Put "packet-lapbether.c" into "Makefile.nmake". svn path=/trunk/; revision=2828 --- packet-dec-bpdu.c | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 166 insertions(+) create mode 100644 packet-dec-bpdu.c (limited to 'packet-dec-bpdu.c') diff --git a/packet-dec-bpdu.c b/packet-dec-bpdu.c new file mode 100644 index 0000000000..0ce0ece8aa --- /dev/null +++ b/packet-dec-bpdu.c @@ -0,0 +1,166 @@ +/* packet-dec-bpdu.c + * Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly + * + * $Id: packet-dec-bpdu.c,v 1.1 2001/01/05 19:00:37 guy Exp $ + * + * Copyright 2001 Paul Ionescu + * + * Ethereal - Network traffic analyzer + * By Gerald Combs + * Copyright 1998 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. + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#ifdef HAVE_SYS_TYPES_H +# include +#endif + +#ifdef HAVE_NETINET_IN_H +# include +#endif + +#include +#include +#include +#include "packet.h" +#include "resolv.h" +#include "etypes.h" + +/* Offsets of fields within a BPDU */ + +#define BPDU_DEC_CODE 0 +#define BPDU_TYPE 1 +#define BPDU_VERSION 2 +#define BPDU_FLAGS 3 +#define BPDU_ROOT_PRI 4 +#define BPDU_ROOT_MAC 6 +#define BPDU_ROOT_PATH_COST 12 +#define BPDU_BRIDGE_PRI 14 +#define BPDU_BRIDGE_MAC 16 +#define BPDU_PORT_IDENTIFIER 22 +#define BPDU_MESSAGE_AGE 23 +#define BPDU_HELLO_TIME 24 +#define BPDU_MAX_AGE 25 +#define BPDU_FORWARD_DELAY 26 + +static int proto_dec_bpdu = -1; + +static gint ett_dec_bpdu = -1; + +static void +dissect_dec_bpdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { + guint8 protocol_identifier; + guint8 protocol_version; + guint8 bpdu_type; + guint8 flags; + proto_tree *bpdu_tree; + proto_item *ti; + + CHECK_DISPLAY_AS_DATA(proto_dec_bpdu, tvb, pinfo, tree); + + pinfo->current_proto = "DEC_STP"; + + if (check_col(pinfo->fd, COL_PROTOCOL)) { + col_set_str(pinfo->fd, COL_PROTOCOL, "DEC_STP"); + } + + bpdu_type = tvb_get_guint8(tvb, BPDU_TYPE); + flags=tvb_get_guint8(tvb,BPDU_FLAGS); + + if (check_col(pinfo->fd, COL_INFO)) { + if (bpdu_type == 25) + col_add_fstr(pinfo->fd, COL_INFO, "Hello Packet"); + else if (bpdu_type == 0x02) + col_add_fstr(pinfo->fd, COL_INFO, "Topology Change Notification"); + } + + if (tree) { + protocol_identifier = tvb_get_guint8(tvb, BPDU_DEC_CODE); + + protocol_version = tvb_get_guint8(tvb, BPDU_VERSION); + + ti = proto_tree_add_protocol_format(tree, proto_dec_bpdu, tvb, 0, 27, + "DEC Spanning Tree Protocol"); + bpdu_tree = proto_item_add_subtree(ti, ett_dec_bpdu); + + proto_tree_add_text(bpdu_tree, tvb, BPDU_DEC_CODE, 1, "Protocol ID: %d (%s)", + protocol_identifier, + protocol_identifier==0xe1?"DEC Spanning Tree Protocol": + "Unknown protocol, the dissection may be wrong"); + + proto_tree_add_text(bpdu_tree, tvb, BPDU_TYPE,1, "BPDU Type: %d (%s)", bpdu_type, + (bpdu_type==25?"Hello Packet":(bpdu_type==2?"Topology change notice":"Unknown"))); + + proto_tree_add_text(bpdu_tree, tvb, BPDU_VERSION,1, "BPDU Version: %d (%s)", + protocol_version,protocol_version==1?"DEC STP Version 1":"Unknown Version"); + + proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS,1, "Flags: %d",flags); + + if (flags & 0x80) + proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " 1... .... Use short timers"); + if (flags & 0x02) + proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " .... ..1. Topology Change Acknowledgment"); + if (flags & 0x01) + proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS, 1, " .... ...1 Topology Change"); + + proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_PRI,2, "Root priority: %d", + tvb_get_ntohs(tvb,BPDU_ROOT_PRI)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_MAC,6, "Root MAC: %s", + ether_to_str(tvb_get_ptr(tvb,BPDU_ROOT_MAC,6))); + proto_tree_add_text(bpdu_tree, tvb, BPDU_ROOT_PATH_COST,2, "Root path cost: %d", + tvb_get_ntohs(tvb,BPDU_ROOT_PATH_COST)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_BRIDGE_PRI,2, "Root priority: %d", + tvb_get_ntohs(tvb,BPDU_BRIDGE_PRI)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_BRIDGE_MAC,6, "Root MAC: %s", + ether_to_str(tvb_get_ptr(tvb,BPDU_BRIDGE_MAC,6))); + proto_tree_add_text(bpdu_tree, tvb, BPDU_PORT_IDENTIFIER,1, "Port identifier: %d", + tvb_get_guint8(tvb,BPDU_PORT_IDENTIFIER)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_MESSAGE_AGE,1, "Age: %d", + tvb_get_guint8(tvb,BPDU_MESSAGE_AGE)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_HELLO_TIME,1, "Hello time: %d", + tvb_get_guint8(tvb,BPDU_HELLO_TIME)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_MAX_AGE,1, "Max Age: %d", + tvb_get_guint8(tvb,BPDU_MAX_AGE)); + proto_tree_add_text(bpdu_tree, tvb, BPDU_FORWARD_DELAY,1, "Forward Delay: %d", + tvb_get_guint8(tvb,BPDU_FORWARD_DELAY)); + + } +} + +void +proto_register_dec_bpdu(void) +{ + + static gint *ett[] = { + &ett_dec_bpdu, + }; + + proto_dec_bpdu = proto_register_protocol("DEC Spanning Tree Protocol", "DEC_STP", "dec_stp"); + proto_register_subtree_array(ett, array_length(ett)); + + register_dissector("dec_bpdu", dissect_dec_bpdu); +} + +void +proto_reg_handoff_dec_bpdu(void) +{ + dissector_add("ethertype", ETHERTYPE_DEC_LB, dissect_dec_bpdu); +} -- cgit v1.2.3