osmocom/wireshark
14
0
Fork 1
Code Issues Pull requests Projects Releases Wiki Activity
wireshark/packet-dec-bpdu.c
Guy Harris 7ecac8fbd0 Add a new Wiretap encapsulation type for Cisco HDLC. Map the NetBSD 
DLT_HDLC to it.

Make a separate dissector for Cisco HDLC, and add a dissector for Cisco
SLARP.  Have the PPP dissector call the Cisco HDLC dissector if the
address field is the Cisco HDLC unicast or multicast address.  Use the
Cisco HDLC dissector for the Cisco HDLC Wiretap encapsulation type.

Add a new dissector table "chdlctype", for Cisco HDLC packet types
(they're *almost* the same as Ethernet types, but 0x8035 is SLARP, not
Reverse ARP, and 0x2000 is the Cisco Discovery protocol, for example),
replacing "fr.chdlc".

Have a "chdlctype()" routine, similar to "ethertype()", used both by the
Cisco HDLC and Frame Relay dissectors.  Have a "chdlc_vals[]"
"value_string" table for Cisco HDLC types and protocol names.  Split the
packet type field in the Frame Relay dissector into separate SNAP and
Cisco HDLC fields, and give them the Ethernet type and Cisco HDLC type
"value_string" tables, respectively.

svn path=/trunk/; revision=3133
2001-03-15 09:11:03 +00:00

175 lines
5.8 KiB
C
Raw Blame History

/* 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);
}
Reference in a new issue View git blame Copy permalink