161 lines
6.1 KiB
C
161 lines
6.1 KiB
C
/* packet-bpdu.c
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* Routines for BPDU (Spanning Tree Protocol) disassembly
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*
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* $Id: packet-bpdu.c,v 1.2 1999/10/08 21:20:23 guy Exp $
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*
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* Copyright 1999 Christophe Tronche <ch.tronche@computer.org>
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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 "util.h"
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/* #ifndef __PACKET_IP_H__ */
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/* #include "packet-ip.h" */
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/* #endif */
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/* Offsets of fields within a BPDU */
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#define BPDU_IDENTIFIER 0
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#define BPDU_VERSION_IDENTIFIER 2
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#define BPDU_TYPE 3
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#define BPDU_FLAGS 4
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#define BPDU_ROOT_IDENTIFIER 5
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#define BPDU_ROOT_PATH_COST 13
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#define BPDU_BRIDGE_IDENTIFIER 17
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#define BPDU_PORT_IDENTIFIER 25
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#define BPDU_MESSAGE_AGE 27
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#define BPDU_MAX_AGE 29
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#define BPDU_HELLO_TIME 31
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#define BPDU_FORWARD_DELAY 33
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static int proto_bpdu = -1;
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void dissect_bpdu(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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guint16 protocol_identifier;
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guint8 protocol_version_identifier;
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guint8 bpdu_type;
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guint8 flags;
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guint16 root_identifier_bridge_priority;
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gchar *root_identifier_mac;
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guint32 root_path_cost;
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guint16 bridge_identifier_bridge_priority;
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gchar *bridge_identifier_mac;
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guint16 port_identifier;
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double message_age;
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double max_age;
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double hello_time;
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double forward_delay;
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proto_tree *bpdu_tree;
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proto_item *ti;
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const u_char *bpdu;
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bpdu = pd + offset;
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bpdu_type = (guint8) bpdu[BPDU_TYPE];
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flags = (guint8) bpdu[BPDU_FLAGS];
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root_identifier_bridge_priority = pntohs(bpdu + BPDU_ROOT_IDENTIFIER);
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root_identifier_mac = ether_to_str(bpdu + BPDU_ROOT_IDENTIFIER + 2);
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root_path_cost = pntohl(bpdu + BPDU_ROOT_PATH_COST);
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port_identifier = pntohs(bpdu + BPDU_PORT_IDENTIFIER);
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if (check_col(fd, COL_PROTOCOL)) {
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col_add_str(fd, COL_PROTOCOL, "STP"); /* Spanning Tree Protocol */
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}
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if (check_col(fd, COL_INFO)) {
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if (bpdu_type == 0)
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col_add_fstr(fd, COL_INFO, "Conf. %sRoot = %d/%s Cost = %d Port = 0x%04x",
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flags & 0x1 ? "TC + " : "",
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root_identifier_bridge_priority, root_identifier_mac, root_path_cost,
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port_identifier);
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else if (bpdu_type == 0x80)
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col_add_fstr(fd, COL_INFO, "Topology Change Notification");
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}
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if (tree) {
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protocol_identifier = pntohs(bpdu + BPDU_IDENTIFIER);
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protocol_version_identifier = (guint8) bpdu[BPDU_VERSION_IDENTIFIER];
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ti = proto_tree_add_item_format(tree, proto_bpdu, offset, 35, NULL, "Spanning Tree Protocol");
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bpdu_tree = proto_item_add_subtree(ti, ETT_BPDU);
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proto_tree_add_text(bpdu_tree, offset + BPDU_IDENTIFIER, 2, "Protocol Identifier: 0x%04x (%s)",
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protocol_identifier,
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protocol_identifier == 0 ? "Spanning Tree" : "Unknown Protocol");
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proto_tree_add_text(bpdu_tree, offset + BPDU_VERSION_IDENTIFIER, 1, "Protocol Version Identifier: %d", protocol_version_identifier);
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if (protocol_version_identifier != 0)
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proto_tree_add_text(bpdu_tree, offset + BPDU_VERSION_IDENTIFIER, 1, " (Warning: this version of packet-bpdu only knows about version = 0)");
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proto_tree_add_text(bpdu_tree, offset + BPDU_TYPE, 1, "BPDU Type: 0x%02x (%s)",
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bpdu_type,
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bpdu_type == 0 ? "Configuration" :
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bpdu_type == 0x80 ? "Topology Change Notification" : "Unknown");
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if (bpdu_type != 0) return;
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bridge_identifier_bridge_priority = pntohs(bpdu + BPDU_BRIDGE_IDENTIFIER);
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bridge_identifier_mac = ether_to_str(bpdu + BPDU_BRIDGE_IDENTIFIER + 2);
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message_age = pntohs(bpdu + BPDU_MESSAGE_AGE) / 256.0;
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max_age = pntohs(bpdu + BPDU_MAX_AGE) / 256.0;
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hello_time = pntohs(bpdu + BPDU_HELLO_TIME) / 256.0;
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forward_delay = pntohs(bpdu + BPDU_FORWARD_DELAY) / 256.0;
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proto_tree_add_text(bpdu_tree, offset + BPDU_FLAGS, 1, "Flags: 0x%02x", flags);
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if (flags & 0x80)
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proto_tree_add_text(bpdu_tree, offset + BPDU_FLAGS, 1, " 1... .... Topology Change Acknowledgment");
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if (flags & 0x01)
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proto_tree_add_text(bpdu_tree, offset + BPDU_FLAGS, 1, " .... ...1 Topology Change");
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proto_tree_add_text(bpdu_tree, offset + BPDU_ROOT_IDENTIFIER, 8, "Root Identifier: %d / %s", root_identifier_bridge_priority, root_identifier_mac);
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proto_tree_add_text(bpdu_tree, offset + BPDU_ROOT_PATH_COST, 4, "Root Path Cost: %d", root_path_cost);
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proto_tree_add_text(bpdu_tree, offset + BPDU_BRIDGE_IDENTIFIER, 8, "Bridge Identifier: %d / %s",
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bridge_identifier_bridge_priority,
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bridge_identifier_mac);
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proto_tree_add_text(bpdu_tree, offset + BPDU_PORT_IDENTIFIER, 2, "Port identifier: 0x%04x", port_identifier);
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proto_tree_add_text(bpdu_tree, offset + BPDU_MESSAGE_AGE, 2, "Message Age: %f", message_age);
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proto_tree_add_text(bpdu_tree, offset + BPDU_MAX_AGE, 2, "Max Age: %f", max_age);
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proto_tree_add_text(bpdu_tree, offset + BPDU_HELLO_TIME, 2, "Hello Time: %f", hello_time);
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proto_tree_add_text(bpdu_tree, offset + BPDU_FORWARD_DELAY, 2, "Forward Delay: %f", forward_delay);
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}
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}
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void
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proto_register_bpdu(void)
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{
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proto_bpdu = proto_register_protocol("Spanning Tree Protocol", "stp");
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}
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