4401f1433f
argument to "tvb_new_subset()" - just use -1 if the subset tvbuff is to run to the end of the parent tvbuff. svn path=/trunk/; revision=5597
590 lines
19 KiB
C
590 lines
19 KiB
C
/* packet-cdp.c
|
|
* Routines for the disassembly of the "Cisco Discovery Protocol"
|
|
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
|
|
*
|
|
* $Id: packet-cdp.c,v 1.45 2002/05/30 01:56:54 guy Exp $
|
|
*
|
|
* Ethereal - Network traffic analyzer
|
|
* By Gerald Combs <gerald@ethereal.com>
|
|
* 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.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include <glib.h>
|
|
#include <epan/packet.h>
|
|
#include <epan/strutil.h>
|
|
#include "nlpid.h"
|
|
|
|
/*
|
|
* See
|
|
*
|
|
* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
|
|
*
|
|
* for some information on CDP.
|
|
*/
|
|
|
|
/* Offsets in TLV structure. */
|
|
#define TLV_TYPE 0
|
|
#define TLV_LENGTH 2
|
|
|
|
static int proto_cdp = -1;
|
|
static int hf_cdp_version = -1;
|
|
static int hf_cdp_checksum = -1;
|
|
static int hf_cdp_ttl = -1;
|
|
static int hf_cdp_tlvtype = -1;
|
|
static int hf_cdp_tlvlength = -1;
|
|
|
|
static gint ett_cdp = -1;
|
|
static gint ett_cdp_tlv = -1;
|
|
static gint ett_cdp_address = -1;
|
|
static gint ett_cdp_capabilities = -1;
|
|
|
|
static dissector_handle_t data_handle;
|
|
|
|
static int
|
|
dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
|
|
static void
|
|
dissect_capabilities(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
|
|
static void
|
|
add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
|
|
gint len, const gchar *prefix);
|
|
|
|
#define TYPE_DEVICE_ID 0x0001
|
|
#define TYPE_ADDRESS 0x0002
|
|
#define TYPE_PORT_ID 0x0003
|
|
#define TYPE_CAPABILITIES 0x0004
|
|
#define TYPE_IOS_VERSION 0x0005
|
|
#define TYPE_PLATFORM 0x0006
|
|
#define TYPE_IP_PREFIX 0x0007
|
|
|
|
#define TYPE_VTP_MGMT_DOMAIN 0x0009 /* Guessed, from tcpdump */
|
|
#define TYPE_NATIVE_VLAN 0x000a /* Guessed, from tcpdump */
|
|
#define TYPE_DUPLEX 0x000b /* Guessed, from tcpdump */
|
|
|
|
static const value_string type_vals[] = {
|
|
{ TYPE_DEVICE_ID, "Device ID" },
|
|
{ TYPE_ADDRESS, "Addresses" },
|
|
{ TYPE_PORT_ID, "Port ID" },
|
|
{ TYPE_CAPABILITIES, "Capabilities" },
|
|
{ TYPE_IOS_VERSION, "Software version" },
|
|
{ TYPE_PLATFORM, "Platform" },
|
|
{ TYPE_IP_PREFIX, "IP Prefix (used for ODR)" },
|
|
{ TYPE_VTP_MGMT_DOMAIN, "VTP Management Domain" },
|
|
{ TYPE_NATIVE_VLAN, "Native VLAN" },
|
|
{ TYPE_DUPLEX, "Duplex" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static void
|
|
dissect_cdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *cdp_tree = NULL;
|
|
int offset = 0;
|
|
guint16 type;
|
|
guint16 length;
|
|
proto_item *tlvi;
|
|
proto_tree *tlv_tree;
|
|
int real_length;
|
|
guint32 naddresses;
|
|
int addr_length;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "CDP");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Cisco Discovery Protocol");
|
|
|
|
if (tree){
|
|
ti = proto_tree_add_item(tree, proto_cdp, tvb, offset, -1, FALSE);
|
|
cdp_tree = proto_item_add_subtree(ti, ett_cdp);
|
|
|
|
/* CDP header */
|
|
proto_tree_add_item(cdp_tree, hf_cdp_version, tvb, offset, 1, FALSE);
|
|
offset += 1;
|
|
proto_tree_add_uint_format(cdp_tree, hf_cdp_ttl, tvb, offset, 1,
|
|
tvb_get_guint8(tvb, offset),
|
|
"TTL: %u seconds",
|
|
tvb_get_guint8(tvb, offset));
|
|
offset += 1;
|
|
proto_tree_add_item(cdp_tree, hf_cdp_checksum, tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
type = tvb_get_ntohs(tvb, offset + TLV_TYPE);
|
|
length = tvb_get_ntohs(tvb, offset + TLV_LENGTH);
|
|
if (length < 4) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset, 4,
|
|
"TLV with invalid length %u (< 4)",
|
|
length);
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
offset += 4;
|
|
break;
|
|
}
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_DEVICE_ID:
|
|
/* Device ID */
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "Device ID: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Device ID: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_ADDRESS:
|
|
/* Addresses */
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "Addresses");
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
offset += 4;
|
|
length -= 4;
|
|
naddresses = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_text(tlv_tree, tvb, offset, 4,
|
|
"Number of addresses: %u", naddresses);
|
|
offset += 4;
|
|
length -= 4;
|
|
while (naddresses != 0) {
|
|
addr_length = dissect_address_tlv(tvb, offset, length,
|
|
tlv_tree);
|
|
if (addr_length < 0)
|
|
break;
|
|
offset += addr_length;
|
|
length -= addr_length;
|
|
|
|
naddresses--;
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_PORT_ID:
|
|
real_length = length;
|
|
if (tvb_get_guint8(tvb, offset + real_length) != 0x00) {
|
|
/* The length in the TLV doesn't appear to be the
|
|
length of the TLV, as the byte just past it
|
|
isn't the first byte of a 2-byte big-endian
|
|
small integer; make the length of the TLV the length
|
|
in the TLV, plus 4 bytes for the TLV type and length,
|
|
minus 1 because that's what makes one capture work. */
|
|
real_length = length + 3;
|
|
}
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
real_length, "Port ID: %.*s",
|
|
real_length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, real_length - 4));
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
real_length - 4,
|
|
"Sent through Interface: %.*s",
|
|
real_length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, real_length - 4));
|
|
offset += real_length;
|
|
break;
|
|
|
|
case TYPE_CAPABILITIES:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "Capabilities");
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
offset += 4;
|
|
length -= 4;
|
|
dissect_capabilities(tvb, offset, length, tlv_tree);
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_IOS_VERSION:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "Software Version");
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
add_multi_line_string_to_tree(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Software Version: ");
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_PLATFORM:
|
|
/* ??? platform */
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Platform: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Platform: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_IP_PREFIX:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "IP Prefixes: %d",length/5);
|
|
|
|
/* the actual number of prefixes is (length-4)/5
|
|
but if the variable is not a "float" but "integer"
|
|
then length/5=(length-4)/5 :) */
|
|
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
offset += 4;
|
|
length -= 4;
|
|
while (length > 0) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset, 5,
|
|
"IP Prefix = %s/%u",
|
|
ip_to_str(tvb_get_ptr(tvb, offset, 4)),
|
|
tvb_get_guint8(tvb,offset+4));
|
|
offset += 5;
|
|
length -= 5;
|
|
}
|
|
break;
|
|
case TYPE_VTP_MGMT_DOMAIN:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "VTP Management Domain: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "VTP Management Domain: %.*s",
|
|
length - 4,
|
|
tvb_get_ptr(tvb, offset + 4, length - 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_NATIVE_VLAN:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Native VLAN: %u",
|
|
tvb_get_ntohs(tvb, offset + 4));
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Native VLAN: %u",
|
|
tvb_get_ntohs(tvb, offset + 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_DUPLEX:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Duplex: %s",
|
|
tvb_get_guint8(tvb, offset + 4) ?
|
|
"Full" : "Half" );
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Duplex: %s",
|
|
tvb_get_guint8(tvb, offset + 4) ?
|
|
"Full" : "Half" );
|
|
offset += length;
|
|
break;
|
|
default:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "Type: %s, length: %u",
|
|
val_to_str(type, type_vals, "Unknown (0x%04x)"),
|
|
length);
|
|
tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
|
|
offset + TLV_TYPE, 2, type);
|
|
proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
|
|
offset + TLV_LENGTH, 2, length);
|
|
if (length > 4) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
length - 4, "Data");
|
|
} else
|
|
return;
|
|
offset += length;
|
|
}
|
|
}
|
|
call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo,
|
|
cdp_tree);
|
|
}
|
|
}
|
|
|
|
#define PROTO_TYPE_NLPID 1
|
|
#define PROTO_TYPE_IEEE_802_2 2
|
|
|
|
static const value_string proto_type_vals[] = {
|
|
{ PROTO_TYPE_NLPID, "NLPID" },
|
|
{ PROTO_TYPE_IEEE_802_2, "802.2" },
|
|
{ 0, NULL },
|
|
};
|
|
|
|
static int
|
|
dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *address_tree;
|
|
guint8 protocol_type;
|
|
guint8 protocol_length;
|
|
int nlpid;
|
|
char *protocol_str;
|
|
guint16 address_length;
|
|
char *address_type_str;
|
|
char *address_str;
|
|
|
|
if (length < 1)
|
|
return -1;
|
|
ti = proto_tree_add_text(tree, tvb, offset, length, "Truncated address");
|
|
address_tree = proto_item_add_subtree(ti, ett_cdp_address);
|
|
protocol_type = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(address_tree, tvb, offset, 1, "Protocol type: %s",
|
|
val_to_str(protocol_type, proto_type_vals, "Unknown (0x%02x)"));
|
|
offset += 1;
|
|
length -= 1;
|
|
|
|
if (length < 1)
|
|
return -1;
|
|
protocol_length = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_text(address_tree, tvb, offset, 1, "Protocol length: %u",
|
|
protocol_length);
|
|
offset += 1;
|
|
length -= 1;
|
|
|
|
if (length < protocol_length) {
|
|
if (length != 0) {
|
|
proto_tree_add_text(address_tree, tvb, offset, length,
|
|
"Protocol: %s (truncated)",
|
|
tvb_bytes_to_str(tvb, offset, length));
|
|
}
|
|
return -1;
|
|
}
|
|
protocol_str = NULL;
|
|
if (protocol_type == PROTO_TYPE_NLPID && protocol_length == 1) {
|
|
nlpid = tvb_get_guint8(tvb, offset);
|
|
protocol_str = val_to_str(nlpid, nlpid_vals, "Unknown (0x%02x)");
|
|
} else
|
|
nlpid = -1;
|
|
if (protocol_str == NULL)
|
|
protocol_str = tvb_bytes_to_str(tvb, offset, protocol_length);
|
|
proto_tree_add_text(address_tree, tvb, offset, protocol_length,
|
|
"Protocol: %s", protocol_str);
|
|
offset += protocol_length;
|
|
length -= protocol_length;
|
|
|
|
if (length < 2)
|
|
return -1;
|
|
address_length = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_text(address_tree, tvb, offset, 2, "Address length: %u",
|
|
address_length);
|
|
offset += 2;
|
|
length -= 2;
|
|
|
|
if (length < address_length) {
|
|
if (length != 0) {
|
|
proto_tree_add_text(address_tree, tvb, offset, length,
|
|
"Address: %s (truncated)",
|
|
tvb_bytes_to_str(tvb, offset, length));
|
|
}
|
|
return -1;
|
|
}
|
|
/* XXX - the Cisco document seems to be saying that, for 802.2-format
|
|
protocol types, 0xAAAA03 0x000000 0x0800 is IPv6, but 0x0800 is
|
|
the Ethernet protocol type for IPv4. */
|
|
length = 2 + protocol_length + 2 + address_length;
|
|
address_type_str = NULL;
|
|
address_str = NULL;
|
|
if (protocol_type == PROTO_TYPE_NLPID && protocol_length == 1) {
|
|
switch (nlpid) {
|
|
|
|
/* XXX - dissect NLPID_ISO8473_CLNP as OSI CLNP address? */
|
|
|
|
case NLPID_IP:
|
|
if (address_length == 4) {
|
|
/* The address is an IP address. */
|
|
address_type_str = "IP address";
|
|
address_str = ip_to_str(tvb_get_ptr(tvb, offset, 4));
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (address_type_str == NULL)
|
|
address_type_str = "Address";
|
|
if (address_str == NULL) {
|
|
address_str = tvb_bytes_to_str(tvb, offset, address_length);
|
|
}
|
|
proto_item_set_text(ti, "%s: %s", address_type_str, address_str);
|
|
proto_tree_add_text(address_tree, tvb, offset, address_length, "%s: %s",
|
|
address_type_str, address_str);
|
|
return 2 + protocol_length + 2 + address_length;
|
|
}
|
|
|
|
static void
|
|
dissect_capabilities(tvbuff_t *tvb, int offset, int length, proto_tree *tree)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *capabilities_tree;
|
|
guint32 capabilities;
|
|
|
|
if (length < 4)
|
|
return;
|
|
capabilities = tvb_get_ntohl(tvb, offset);
|
|
ti = proto_tree_add_text(tree, tvb, offset, length, "Capabilities: 0x%08x",
|
|
capabilities);
|
|
capabilities_tree = proto_item_add_subtree(ti, ett_cdp_capabilities);
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x01, 4*8,
|
|
"Performs level 3 routing",
|
|
"Doesn't perform level 3 routing"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x02, 4*8,
|
|
"Performs level 2 transparent bridging",
|
|
"Doesn't perform level 2 transparent bridging"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x04, 4*8,
|
|
"Performs level 2 source-route bridging",
|
|
"Doesn't perform level 2 source-route bridging"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x08, 4*8,
|
|
"Performs level 2 switching",
|
|
"Doesn't perform level 2 switching"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x10, 4*8,
|
|
"Sends and receives packets for network-layer protocols",
|
|
"Doesn't send or receive packets for network-layer protocols"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x20, 4*8,
|
|
"Doesn't forward IGMP Report packets on nonrouter ports",
|
|
"Forwards IGMP Report packets on nonrouter ports"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x40, 4*8,
|
|
"Provides level 1 functionality",
|
|
"Doesn't provide level 1 functionality"));
|
|
}
|
|
|
|
static void
|
|
add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
|
|
gint len, const gchar *prefix)
|
|
{
|
|
int prefix_len;
|
|
int i;
|
|
char blanks[64+1];
|
|
gint next;
|
|
int line_len;
|
|
int data_len;
|
|
|
|
prefix_len = strlen(prefix);
|
|
if (prefix_len > 64)
|
|
prefix_len = 64;
|
|
for (i = 0; i < prefix_len; i++)
|
|
blanks[i] = ' ';
|
|
blanks[i] = '\0';
|
|
while (len > 0) {
|
|
line_len = tvb_find_line_end(tvb, start, len, &next);
|
|
data_len = next - start;
|
|
proto_tree_add_text(tree, tvb, start, data_len, "%s%.*s", prefix,
|
|
line_len, tvb_get_ptr(tvb, start, line_len));
|
|
start += data_len;
|
|
len -= data_len;
|
|
prefix = blanks;
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_cdp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_cdp_version,
|
|
{ "Version", "cdp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cdp_ttl,
|
|
{ "TTL", "cdp.ttl", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cdp_checksum,
|
|
{ "Checksum", "cdp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cdp_tlvtype,
|
|
{ "Type", "cdp.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
|
|
"", HFILL }},
|
|
|
|
{ &hf_cdp_tlvlength,
|
|
{ "Length", "cdp.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_cdp,
|
|
&ett_cdp_tlv,
|
|
&ett_cdp_address,
|
|
&ett_cdp_capabilities,
|
|
};
|
|
|
|
proto_cdp = proto_register_protocol("Cisco Discovery Protocol",
|
|
"CDP", "cdp");
|
|
proto_register_field_array(proto_cdp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_cdp(void)
|
|
{
|
|
dissector_handle_t cdp_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
cdp_handle = create_dissector_handle(dissect_cdp, proto_cdp);
|
|
dissector_add("llc.cisco_pid", 0x2000, cdp_handle);
|
|
dissector_add("chdlctype", 0x2000, cdp_handle);
|
|
}
|