1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/* packet-dec-bpdu.c
* Routines for DEC BPDU (DEC Spanning Tree Protocol) disassembly
*
* $Id: packet-dec-bpdu.c,v 1.7 2001/03/15 09:11:00 guy Exp $
*
* Copyright 2001 Paul Ionescu <paul@acorp.ro>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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 <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "resolv.h"
#include "etypes.h"
#include "ppptypes.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
#define DEC_BPDU_SIZE 27
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;
if (check_col(pinfo->fd, COL_PROTOCOL)) {
col_set_str(pinfo->fd, COL_PROTOCOL, "DEC_STP");
}
if (check_col(pinfo->fd, COL_INFO)) {
col_clear(pinfo->fd, COL_INFO);
}
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");
}
tvb_set_reported_length(tvb, DEC_BPDU_SIZE);
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, DEC_BPDU_SIZE,
"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: 0x%02x (%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: %u (%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: %u (%s)",
protocol_version,protocol_version==1?"DEC STP Version 1":"Unknown Version");
proto_tree_add_text(bpdu_tree, tvb, BPDU_FLAGS,1, "Flags: 0x%02x",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: %u",
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: %u",
tvb_get_ntohs(tvb,BPDU_ROOT_PATH_COST));
proto_tree_add_text(bpdu_tree, tvb, BPDU_BRIDGE_PRI,2, "Root priority: %u",
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: %u",
tvb_get_guint8(tvb,BPDU_PORT_IDENTIFIER));
proto_tree_add_text(bpdu_tree, tvb, BPDU_MESSAGE_AGE,1, "Age: %u",
tvb_get_guint8(tvb,BPDU_MESSAGE_AGE));
proto_tree_add_text(bpdu_tree, tvb, BPDU_HELLO_TIME,1, "Hello time: %u",
tvb_get_guint8(tvb,BPDU_HELLO_TIME));
proto_tree_add_text(bpdu_tree, tvb, BPDU_MAX_AGE,1, "Max Age: %u",
tvb_get_guint8(tvb,BPDU_MAX_AGE));
proto_tree_add_text(bpdu_tree, tvb, BPDU_FORWARD_DELAY,1, "Forward Delay: %u",
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));
}
void
proto_reg_handoff_dec_bpdu(void)
{
dissector_add("ethertype", ETHERTYPE_DEC_LB, dissect_dec_bpdu,
proto_dec_bpdu);
dissector_add("chdlctype", ETHERTYPE_DEC_LB, dissect_dec_bpdu,
proto_dec_bpdu);
dissector_add("ppp.protocol", PPP_DEC_LB, dissect_dec_bpdu,
proto_dec_bpdu);
}
|
