forked from osmocom/wireshark
669db206cb
Also move ncp222.py, x11-fields, process-x11-fields.pl, make-reg-dotc, and make-reg-dotc.py. Adjust #include lines in files that include packet-*.h files. svn path=/trunk/; revision=11410
833 lines
28 KiB
C
833 lines
28 KiB
C
/* packet-cdp.c
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* Routines for the disassembly of the "Cisco Discovery Protocol"
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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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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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include "oui.h"
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#include "nlpid.h"
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/*
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* See
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*
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* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
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*
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* for some information on CDP.
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*
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* See
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*
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* http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a0080094713.shtml
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*
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* for some more information on CDP version 2.
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*/
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/* Offsets in TLV structure. */
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#define TLV_TYPE 0
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#define TLV_LENGTH 2
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static int proto_cdp = -1;
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static int hf_cdp_version = -1;
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static int hf_cdp_checksum = -1;
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static int hf_cdp_ttl = -1;
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static int hf_cdp_tlvtype = -1;
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static int hf_cdp_tlvlength = -1;
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static gint ett_cdp = -1;
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static gint ett_cdp_tlv = -1;
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static gint ett_cdp_address = -1;
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static gint ett_cdp_capabilities = -1;
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static dissector_handle_t data_handle;
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static int
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dissect_address_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
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static void
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dissect_capabilities(tvbuff_t *tvb, int offset, int length, proto_tree *tree);
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static void
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add_multi_line_string_to_tree(proto_tree *tree, tvbuff_t *tvb, gint start,
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gint len, const gchar *prefix);
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#define TYPE_DEVICE_ID 0x0001
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#define TYPE_ADDRESS 0x0002
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#define TYPE_PORT_ID 0x0003
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#define TYPE_CAPABILITIES 0x0004
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#define TYPE_IOS_VERSION 0x0005
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#define TYPE_PLATFORM 0x0006
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#define TYPE_IP_PREFIX 0x0007
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#define TYPE_PROTOCOL_HELLO 0x0008 /* Protocol Hello */
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#define TYPE_VTP_MGMT_DOMAIN 0x0009 /* VTP Domain, CTPv2 - see second URL */
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#define TYPE_NATIVE_VLAN 0x000a /* Native VLAN, CTPv2 - see second URL */
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#define TYPE_DUPLEX 0x000b /* Full/Half Duplex - see second URL */
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/* Somewhere in here there's a Power Draw TLV */
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/* 0x000c */
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/* 0x000d */
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#define TYPE_VOIP_VLAN_REPLY 0x000e /* VoIP VLAN reply */
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#define TYPE_VOIP_VLAN_QUERY 0x000f /* VoIP VLAN query */
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#define TYPE_MTU 0x0011 /* MTU */
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#define TYPE_TRUST_BITMAP 0x0012 /* Trust bitmap */
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#define TYPE_UNTRUSTED_COS 0x0013 /* Untrusted port CoS */
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#define TYPE_SYSTEM_NAME 0x0014 /* System Name */
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#define TYPE_SYSTEM_OID 0x0015 /* System OID */
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#define TYPE_MANAGEMENT_ADDR 0x0016 /* Management Address(es) */
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#define TYPE_LOCATION 0x0017 /* Location */
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static const value_string type_vals[] = {
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{ TYPE_DEVICE_ID, "Device ID" },
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{ TYPE_ADDRESS, "Addresses" },
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{ TYPE_PORT_ID, "Port ID" },
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{ TYPE_CAPABILITIES, "Capabilities" },
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{ TYPE_IOS_VERSION, "Software version" },
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{ TYPE_PLATFORM, "Platform" },
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{ TYPE_IP_PREFIX, "IP Prefix/Gateway (used for ODR)" },
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{ TYPE_PROTOCOL_HELLO, "Protocol Hello" },
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{ TYPE_VTP_MGMT_DOMAIN, "VTP Management Domain" },
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{ TYPE_NATIVE_VLAN, "Native VLAN" },
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{ TYPE_DUPLEX, "Duplex" },
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{ TYPE_VOIP_VLAN_REPLY, "VoIP VLAN Reply" },
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{ TYPE_VOIP_VLAN_QUERY, "VoIP VLAN Query" },
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{ TYPE_MTU, "MTU"},
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{ TYPE_TRUST_BITMAP, "Trust Bitmap" },
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{ TYPE_UNTRUSTED_COS, "Untrusted Port CoS" },
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{ TYPE_SYSTEM_NAME, "System Name" },
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{ TYPE_SYSTEM_OID, "System Object ID" },
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{ TYPE_MANAGEMENT_ADDR, "Management Address" },
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{ TYPE_LOCATION, "Location" },
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{ 0, NULL },
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};
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#define TYPE_HELLO_CLUSTER_MGMT 0x0112
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static const value_string type_hello_vals[] = {
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{ TYPE_HELLO_CLUSTER_MGMT, "Cluster Management" },
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{ 0, NULL },
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};
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static void
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dissect_cdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *cdp_tree = NULL;
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int offset = 0;
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guint16 type;
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guint16 length;
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proto_item *tlvi;
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proto_tree *tlv_tree;
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int real_length;
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guint32 naddresses;
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int addr_length;
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guint32 ip_addr;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CDP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "Cisco Discovery Protocol");
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if (tree){
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ti = proto_tree_add_item(tree, proto_cdp, tvb, offset, -1, FALSE);
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cdp_tree = proto_item_add_subtree(ti, ett_cdp);
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/* CDP header */
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proto_tree_add_item(cdp_tree, hf_cdp_version, tvb, offset, 1, FALSE);
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offset += 1;
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proto_tree_add_uint_format(cdp_tree, hf_cdp_ttl, tvb, offset, 1,
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tvb_get_guint8(tvb, offset),
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"TTL: %u seconds",
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tvb_get_guint8(tvb, offset));
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offset += 1;
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proto_tree_add_item(cdp_tree, hf_cdp_checksum, tvb, offset, 2, FALSE);
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offset += 2;
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while (tvb_reported_length_remaining(tvb, offset) != 0) {
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type = tvb_get_ntohs(tvb, offset + TLV_TYPE);
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length = tvb_get_ntohs(tvb, offset + TLV_LENGTH);
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if (length < 4) {
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset, 4,
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"TLV with invalid length %u (< 4)",
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length);
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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offset += 4;
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break;
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}
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switch (type) {
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case TYPE_DEVICE_ID:
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/* Device ID */
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "Device ID: %s",
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tvb_format_stringzpad(tvb, offset + 4, length - 4));
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, tvb, offset + 4,
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length - 4, "Device ID: %s",
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tvb_format_stringzpad(tvb, offset + 4, length - 4));
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offset += length;
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break;
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case TYPE_ADDRESS:
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/* Addresses */
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "Addresses");
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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offset += 4;
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length -= 4;
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naddresses = tvb_get_ntohl(tvb, offset);
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proto_tree_add_text(tlv_tree, tvb, offset, 4,
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"Number of addresses: %u", naddresses);
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offset += 4;
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length -= 4;
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while (naddresses != 0) {
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addr_length = dissect_address_tlv(tvb, offset, length,
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tlv_tree);
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if (addr_length < 0)
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break;
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offset += addr_length;
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length -= addr_length;
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naddresses--;
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}
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offset += length;
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break;
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case TYPE_PORT_ID:
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real_length = length;
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if (tvb_get_guint8(tvb, offset + real_length) != 0x00) {
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/* The length in the TLV doesn't appear to be the
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length of the TLV, as the byte just past it
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isn't the first byte of a 2-byte big-endian
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small integer; make the length of the TLV the length
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in the TLV, plus 4 bytes for the TLV type and length,
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minus 1 because that's what makes one capture work. */
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real_length = length + 3;
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}
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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real_length, "Port ID: %s",
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tvb_format_text(tvb, offset + 4, real_length - 4));
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, tvb, offset + 4,
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real_length - 4,
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"Sent through Interface: %s",
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tvb_format_text(tvb, offset + 4, real_length - 4));
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offset += real_length;
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break;
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case TYPE_CAPABILITIES:
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "Capabilities");
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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offset += 4;
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length -= 4;
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dissect_capabilities(tvb, offset, length, tlv_tree);
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offset += length;
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break;
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case TYPE_IOS_VERSION:
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "Software Version");
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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add_multi_line_string_to_tree(tlv_tree, tvb, offset + 4,
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length - 4, "Software Version: ");
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offset += length;
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break;
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case TYPE_PLATFORM:
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/* ??? platform */
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tlvi = proto_tree_add_text(cdp_tree, tvb,
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offset, length, "Platform: %s",
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tvb_format_text(tvb, offset + 4, length - 4));
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, tvb, offset + 4,
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length - 4, "Platform: %s",
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tvb_format_text(tvb, offset + 4, length - 4));
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offset += length;
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break;
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case TYPE_IP_PREFIX:
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if (length == 8) {
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/* if length is 8 then this is default gw not prefix */
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "ODR Default gateway: %s",
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ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, tvb, offset+4, 4,
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"ODR Default gateway = %s",
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ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
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offset += 8;
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} else {
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tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
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length, "IP Prefixes: %d",length/5);
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/* the actual number of prefixes is (length-4)/5
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but if the variable is not a "float" but "integer"
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then length/5=(length-4)/5 :) */
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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offset += 4;
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length -= 4;
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while (length > 0) {
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proto_tree_add_text(tlv_tree, tvb, offset, 5,
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"IP Prefix = %s/%u",
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ip_to_str(tvb_get_ptr(tvb, offset, 4)),
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tvb_get_guint8(tvb,offset+4));
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offset += 5;
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length -= 5;
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}
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}
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break;
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case TYPE_PROTOCOL_HELLO:
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tlvi = proto_tree_add_text(cdp_tree, tvb,
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offset,length, "Protocol Hello: %s",
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val_to_str(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown (0x%04x)"));
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tlv_tree = proto_item_add_subtree(tlvi, ett_cdp_tlv);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvtype, tvb,
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offset + TLV_TYPE, 2, type);
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proto_tree_add_uint(tlv_tree, hf_cdp_tlvlength, tvb,
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offset + TLV_LENGTH, 2, length);
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proto_tree_add_text(tlv_tree, tvb, offset+4, 3,
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"OUI: 0x%06X (%s)",
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tvb_get_ntoh24(tvb,offset+4),
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val_to_str(tvb_get_ntoh24(tvb,offset+4), oui_vals, "Unknown"));
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proto_tree_add_text(tlv_tree, tvb, offset+7, 2,
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"Protocol ID: 0x%04X (%s)",
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tvb_get_ntohs(tvb, offset+7),
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val_to_str(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown"));
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switch(tvb_get_ntohs(tvb, offset+7)) {
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case TYPE_HELLO_CLUSTER_MGMT:
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/* proto_tree_add_text(tlv_tree, tvb, offset+9,
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length - 9, "Cluster Management");
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*/
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tvb_memcpy(tvb, (guint8 *)&ip_addr, offset+9, 4);
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proto_tree_add_text(tlv_tree, tvb, offset+9, 4,
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"Cluster Master IP: %s",ip_to_str((guint8 *)&ip_addr));
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tvb_memcpy(tvb, (guint8 *)&ip_addr, offset+13, 4);
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proto_tree_add_text(tlv_tree, tvb, offset+13, 4,
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"UNKNOWN (IP?): 0x%08X (%s)",
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ip_addr, ip_to_str((guint8 *)&ip_addr));
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proto_tree_add_text(tlv_tree, tvb, offset+17, 1,
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"Version?: 0x%02X",
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tvb_get_guint8(tvb, offset+17));
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proto_tree_add_text(tlv_tree, tvb, offset+18, 1,
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"Sub Version?: 0x%02X",
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tvb_get_guint8(tvb, offset+18));
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proto_tree_add_text(tlv_tree, tvb, offset+19, 1,
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"Status?: 0x%02X",
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tvb_get_guint8(tvb, offset+19));
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proto_tree_add_text(tlv_tree, tvb, offset+20, 1,
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"UNKNOWN: 0x%02X",
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tvb_get_guint8(tvb, offset+20));
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proto_tree_add_text(tlv_tree, tvb, offset+21, 6,
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"Cluster Commander MAC: %s",
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ether_to_str(tvb_get_ptr(tvb, offset+21, 6)));
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proto_tree_add_text(tlv_tree, tvb, offset+27, 6,
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"Switch's MAC: %s",
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ether_to_str(tvb_get_ptr(tvb, offset+27, 6)));
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proto_tree_add_text(tlv_tree, tvb, offset+33, 1,
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"UNKNOWN: 0x%02X",
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tvb_get_guint8(tvb, offset+33));
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proto_tree_add_text(tlv_tree, tvb, offset+34, 2,
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"Management VLAN: %d",
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tvb_get_ntohs(tvb, offset+34));
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break;
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default:
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proto_tree_add_text(tlv_tree, tvb, offset + 9,
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length - 9, "Unknown");
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break;
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}
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offset += length;
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break;
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case TYPE_VTP_MGMT_DOMAIN:
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tlvi = proto_tree_add_text(cdp_tree, tvb,
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offset, length, "VTP Management Domain: %s",
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tvb_format_text(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",
|
|
tvb_format_text(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;
|
|
case TYPE_VOIP_VLAN_REPLY:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "VoIP VLAN Reply");
|
|
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, "Data");
|
|
offset += length;
|
|
break;
|
|
case TYPE_VOIP_VLAN_QUERY:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "VoIP VLAN Query");
|
|
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, "Data");
|
|
offset += length;
|
|
break;
|
|
case TYPE_MTU:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "MTU: %u",
|
|
tvb_get_ntohl(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, "MTU: %u",
|
|
tvb_get_ntohl(tvb,offset + 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_TRUST_BITMAP:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Trust Bitmap: 0x%02X",
|
|
tvb_get_guint8(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, "Trust Bitmap: %02x",
|
|
tvb_get_guint8(tvb, offset + 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_UNTRUSTED_COS:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Untrusted port CoS: 0x%02X",
|
|
tvb_get_guint8(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, "Untrusted port CoS: %02x",
|
|
tvb_get_guint8(tvb, offset + 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_SYSTEM_NAME:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "System Name: %s",
|
|
tvb_format_text(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, "System Name: %s",
|
|
tvb_format_text(tvb, offset + 4, length - 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_SYSTEM_OID:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "System Object Identifier");
|
|
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, "System Object Identifier: %s",
|
|
tvb_bytes_to_str(tvb, offset + 4, length - 4));
|
|
offset += length;
|
|
break;
|
|
case TYPE_MANAGEMENT_ADDR:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Management 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_LOCATION:
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Location: %s",
|
|
tvb_format_text(tvb, offset + 5, length - 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);
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 4,
|
|
1 , "UNKNOWN: 0x%02X",
|
|
tvb_get_guint8(tvb, offset + 4));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 5,
|
|
length - 5, "Location: %s",
|
|
tvb_format_text(tvb, offset + 5, length - 5));
|
|
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,
|
|
"Is a Router",
|
|
"Not a Router"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x02, 4*8,
|
|
"Is a Transparent Bridge",
|
|
"Not a Transparent Bridge"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x04, 4*8,
|
|
"Is a Source Route Bridge",
|
|
"Not a Source Route Bridge"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x08, 4*8,
|
|
"Is a Switch",
|
|
"Not a Switch"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x10, 4*8,
|
|
"Is a Host",
|
|
"Not a Host"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x20, 4*8,
|
|
"Is IGMP capable",
|
|
"Not IGMP capable"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4,
|
|
decode_boolean_bitfield(capabilities, 0x40, 4*8,
|
|
"Is a Repeater",
|
|
"Not a Repeater"));
|
|
}
|
|
|
|
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, FALSE);
|
|
data_len = next - start;
|
|
proto_tree_add_text(tree, tvb, start, data_len, "%s%s", prefix,
|
|
tvb_format_stringzpad(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);
|
|
dissector_add("ppp.protocol", 0x0207, cdp_handle);
|
|
}
|