1305 lines
42 KiB
C
1305 lines
42 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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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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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#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 <epan/in_cksum.h>
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#include <epan/oui.h>
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#include <epan/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#xtocid12
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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#cdp
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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_checksum_good = -1;
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static int hf_cdp_checksum_bad = -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_nrgyz_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 gint ett_cdp_checksum = -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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dissect_nrgyz_tlv(tvbuff_t *tvb, int offset, guint16 length, guint16 num,
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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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/* 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_POWER 0x0010 /* Power consumption */
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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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#define TYPE_EXT_PORT_ID 0x0018 /* External Port-ID */
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#define TYPE_POWER_REQUESTED 0x0019 /* Power Requested */
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#define TYPE_POWER_AVAILABLE 0x001a /* Power Available */
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#define TYPE_PORT_UNIDIR 0x001b /* Port Unidirectional */
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#define TYPE_NRGYZ 0x001d /* EnergyWise over CDP */
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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_POWER, "Power consumption" },
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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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{ TYPE_EXT_PORT_ID, "External Port-ID" },
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{ TYPE_POWER_REQUESTED, "Power Requested" },
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{ TYPE_POWER_AVAILABLE, "Power Available" },
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{ TYPE_PORT_UNIDIR, "Port Unidirectional" },
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{ TYPE_NRGYZ, "EnergyWise" },
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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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#define TYPE_NRGYZ_ROLE 0x00000007
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#define TYPE_NRGYZ_DOMAIN 0x00000008
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#define TYPE_NRGYZ_NAME 0x00000009
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#define TYPE_NRGYZ_REPLYTO 0x00000017
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static const value_string type_nrgyz_vals[] = {
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{ TYPE_NRGYZ_ROLE, "Role" },
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{ TYPE_NRGYZ_DOMAIN, "Domain" },
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{ TYPE_NRGYZ_NAME, "Name" },
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{ TYPE_NRGYZ_REPLYTO, "Reply To" },
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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, *checksum_item;
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proto_tree *cdp_tree = NULL, *checksum_tree;
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int offset = 0;
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guint16 type;
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guint16 length, packet_checksum, computed_checksum, data_length;
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gboolean checksum_good, checksum_bad;
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proto_item *tlvi = NULL;
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proto_tree *tlv_tree = NULL;
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int real_length;
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guint32 naddresses;
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guint32 power_avail_len, power_avail;
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guint32 power_req_len, power_req;
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int addr_length;
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guint32 ip_addr;
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vec_t cksum_vec[1];
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "CDP");
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col_clear(pinfo->cinfo, COL_INFO);
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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_value(cdp_tree, hf_cdp_ttl, tvb, offset, 1,
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tvb_get_guint8(tvb, offset),
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"%u seconds",
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tvb_get_guint8(tvb, offset));
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offset += 1;
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} else {
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offset += 2; /* The version/ttl fields from above */
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}
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/* Checksum display & verification code */
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packet_checksum = tvb_get_ntohs(tvb, offset);
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data_length = tvb_reported_length(tvb);
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/* CDP doesn't adhere to RFC 1071 section 2. (B). It incorrectly assumes
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* checksums are calculated on a big endian platform, therefore i.s.o.
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* padding odd sized data with a zero byte _at the end_ it sets the last
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* big endian _word_ to contain the last network _octet_. This byteswap
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* has to be done on the last octet of network data before feeding it to
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* the Internet checksum routine.
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* CDP checksumming code has a bug in the addition of this last _word_
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* as a signed number into the long word intermediate checksum. When
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* reducing this long to word size checksum an off-by-one error can be
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* made. This off-by-one error is compensated for in the last _word_ of
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* the network data.
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*/
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if (data_length & 1) {
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guint8 *padded_buffer;
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/* Allocate new buffer */
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padded_buffer = ep_alloc(data_length+1);
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tvb_memcpy(tvb, padded_buffer, 0, data_length);
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/* Swap bytes in last word */
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padded_buffer[data_length] = padded_buffer[data_length-1];
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padded_buffer[data_length-1] = 0;
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/* Compensate off-by-one error */
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if (padded_buffer[data_length] & 0x80) {
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padded_buffer[data_length]--;
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padded_buffer[data_length-1]--;
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}
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/* Setup checksum routine data buffer */
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cksum_vec[0].ptr = padded_buffer;
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cksum_vec[0].len = data_length+1;
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} else {
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/* Setup checksum routine data buffer */
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cksum_vec[0].ptr = tvb_get_ptr(tvb, 0, data_length);
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cksum_vec[0].len = data_length;
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}
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computed_checksum = in_cksum(cksum_vec, 1);
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checksum_good = (computed_checksum == 0);
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checksum_bad = !checksum_good;
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if (checksum_good) {
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checksum_item = proto_tree_add_uint_format(cdp_tree,
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hf_cdp_checksum, tvb, offset, 2, packet_checksum,
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"Checksum: 0x%04x [correct]", packet_checksum);
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} else {
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checksum_item = proto_tree_add_uint_format(cdp_tree,
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hf_cdp_checksum, tvb, offset, 2, packet_checksum,
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"Checksum: 0x%04x [incorrect, should be 0x%04x]",
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packet_checksum,
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in_cksum_shouldbe(packet_checksum, computed_checksum));
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}
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checksum_tree = proto_item_add_subtree(checksum_item, ett_cdp_checksum);
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checksum_item = proto_tree_add_boolean(checksum_tree, hf_cdp_checksum_good,
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tvb, offset, 2, checksum_good);
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PROTO_ITEM_SET_GENERATED(checksum_item);
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checksum_item = proto_tree_add_boolean(checksum_tree, hf_cdp_checksum_bad,
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tvb, offset, 2, checksum_bad);
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PROTO_ITEM_SET_GENERATED(checksum_item);
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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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if (tree) {
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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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}
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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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if(check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Device ID: %s ",
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tvb_format_stringzpad(tvb, offset + 4,
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length - 4));
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if (tree) {
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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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}
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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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if(check_col(pinfo->cinfo, COL_INFO))
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"Port ID: %s ",
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tvb_format_stringzpad(tvb, offset + 4,
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length - 4));
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if (tree) {
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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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}
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offset += real_length;
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break;
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case TYPE_ADDRESS:
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/* Addresses */
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if (tree) {
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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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}
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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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if (tree) {
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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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}
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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_CAPABILITIES:
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if (tree) {
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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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}
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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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if (tree) {
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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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}
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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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if (tree) {
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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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}
|
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offset += length;
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break;
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|
|
case TYPE_IP_PREFIX:
|
|
if (length == 8) {
|
|
/* if length is 8 then this is default gw not prefix */
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset,
|
|
length, "ODR Default gateway: %s",
|
|
ip_to_str(tvb_get_ptr(tvb, offset+4, 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, 4,
|
|
"ODR Default gateway = %s",
|
|
ip_to_str(tvb_get_ptr(tvb, offset+4, 4)));
|
|
}
|
|
offset += 8;
|
|
} else {
|
|
if (tree) {
|
|
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) {
|
|
if (tree) {
|
|
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_PROTOCOL_HELLO:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset,length, "Protocol Hello: %s",
|
|
val_to_str(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown (0x%04x)"));
|
|
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, 3,
|
|
"OUI: 0x%06X (%s)",
|
|
tvb_get_ntoh24(tvb,offset+4),
|
|
val_to_str(tvb_get_ntoh24(tvb,offset+4), oui_vals, "Unknown"));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+7, 2,
|
|
"Protocol ID: 0x%04X (%s)",
|
|
tvb_get_ntohs(tvb, offset+7),
|
|
val_to_str(tvb_get_ntohs(tvb, offset+7), type_hello_vals, "Unknown"));
|
|
|
|
switch(tvb_get_ntohs(tvb, offset+7)) {
|
|
|
|
case TYPE_HELLO_CLUSTER_MGMT:
|
|
/* proto_tree_add_text(tlv_tree, tvb, offset+9,
|
|
length - 9, "Cluster Management");
|
|
*/
|
|
ip_addr = tvb_get_ipv4(tvb, offset+9);
|
|
proto_tree_add_text(tlv_tree, tvb, offset+9, 4,
|
|
"Cluster Master IP: %s",ip_to_str((guint8 *)&ip_addr));
|
|
ip_addr = tvb_get_ipv4(tvb, offset+13);
|
|
proto_tree_add_text(tlv_tree, tvb, offset+13, 4,
|
|
"UNKNOWN (IP?): 0x%08X (%s)",
|
|
ip_addr, ip_to_str((guint8 *)&ip_addr));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+17, 1,
|
|
"Version?: 0x%02X",
|
|
tvb_get_guint8(tvb, offset+17));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+18, 1,
|
|
"Sub Version?: 0x%02X",
|
|
tvb_get_guint8(tvb, offset+18));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+19, 1,
|
|
"Status?: 0x%02X",
|
|
tvb_get_guint8(tvb, offset+19));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+20, 1,
|
|
"UNKNOWN: 0x%02X",
|
|
tvb_get_guint8(tvb, offset+20));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+21, 6,
|
|
"Cluster Commander MAC: %s",
|
|
ether_to_str(tvb_get_ptr(tvb, offset+21, 6)));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+27, 6,
|
|
"Switch's MAC: %s",
|
|
ether_to_str(tvb_get_ptr(tvb, offset+27, 6)));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+33, 1,
|
|
"UNKNOWN: 0x%02X",
|
|
tvb_get_guint8(tvb, offset+33));
|
|
proto_tree_add_text(tlv_tree, tvb, offset+34, 2,
|
|
"Management VLAN: %d",
|
|
tvb_get_ntohs(tvb, offset+34));
|
|
break;
|
|
default:
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 9,
|
|
length - 9, "Unknown");
|
|
break;
|
|
}
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_VTP_MGMT_DOMAIN:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "VTP Management Domain: %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, "VTP Management Domain: %s",
|
|
tvb_format_text(tvb, offset + 4, length - 4));
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_NATIVE_VLAN:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
if (length >= 7) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb, offset, length,
|
|
"VoIP VLAN Reply: %u", tvb_get_ntohs(tvb, offset + 5));
|
|
} else {
|
|
/*
|
|
* XXX - what are these? I've seen them in some captures;
|
|
* they have a length of 6, and run up to the end of
|
|
* the packet, so if we try to dissect it the same way
|
|
* we dissect the 7-byte ones, we report a malformed
|
|
* frame.
|
|
*/
|
|
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,
|
|
1, "Data");
|
|
if (length >= 7) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 5,
|
|
2, "Voice VLAN: %u",
|
|
tvb_get_ntohs(tvb, offset + 5));
|
|
}
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_VOIP_VLAN_QUERY:
|
|
if (tree) {
|
|
if (length >= 7) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "VoIP VLAN Query: %u", tvb_get_ntohs(tvb, offset + 5));
|
|
} else {
|
|
/*
|
|
* XXX - what are these? I've seen them in some captures;
|
|
* they have a length of 6, and run up to the end of
|
|
* the packet, so if we try to dissect it the same way
|
|
* we dissect the 7-byte ones, we report a malformed
|
|
* frame.
|
|
*/
|
|
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,
|
|
1, "Data");
|
|
if (length >= 7) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 5,
|
|
2, "Voice VLAN: %u",
|
|
tvb_get_ntohs(tvb, offset + 5));
|
|
}
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_POWER:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Power Consumption: %u mW",
|
|
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, "Power Consumption: %u mW",
|
|
tvb_get_ntohs(tvb, offset + 4));
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
case TYPE_MTU:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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);
|
|
if (tree) {
|
|
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:
|
|
if (tree) {
|
|
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;
|
|
|
|
case TYPE_POWER_REQUESTED:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Power Request: ");
|
|
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,
|
|
2, "Request-ID: %u",
|
|
tvb_get_ntohs(tvb, offset + 4));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 6,
|
|
2, "Management-ID: %u",
|
|
tvb_get_ntohs(tvb, offset + 6));
|
|
}
|
|
power_req_len = (tvb_get_ntohs(tvb, offset + TLV_LENGTH)) - 8;
|
|
/* Move offset to where the list of Power Request Values Exist */
|
|
offset += 8;
|
|
while(power_req_len) {
|
|
if (power_req_len > 4) {
|
|
power_req = tvb_get_ntohl(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset,
|
|
4, "Power Requested: %u mW", power_req);
|
|
proto_item_append_text(tlvi, "%u mW, ", power_req);
|
|
}
|
|
power_req_len -= 4;
|
|
offset += 4;
|
|
} else {
|
|
if (power_req_len == 4) {
|
|
power_req = tvb_get_ntohl(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset,
|
|
4, "Power Requested: %u mW", power_req);
|
|
proto_item_append_text(tlvi, "%u mW", power_req);
|
|
}
|
|
}
|
|
offset += power_req_len;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case TYPE_POWER_AVAILABLE:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "Power Available: ");
|
|
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,
|
|
2, "Request-ID: %u",
|
|
tvb_get_ntohs(tvb, offset + 4));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 6,
|
|
2, "Management-ID: %u",
|
|
tvb_get_ntohs(tvb, offset + 6));
|
|
}
|
|
power_avail_len = (tvb_get_ntohs(tvb, offset + TLV_LENGTH)) - 8;
|
|
/* Move offset to where the list of Power Available Values Exist */
|
|
offset += 8;
|
|
while(power_avail_len) {
|
|
if (power_avail_len >= 4) {
|
|
power_avail = tvb_get_ntohl(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_text(tlv_tree, tvb, offset,
|
|
4, "Power Available: %u mW", power_avail);
|
|
proto_item_append_text(tlvi, "%u mW, ", power_avail);
|
|
}
|
|
power_avail_len -= 4;
|
|
offset += 4;
|
|
} else {
|
|
offset += power_avail_len;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case TYPE_NRGYZ:
|
|
if (tree) {
|
|
tlvi = proto_tree_add_text(cdp_tree, tvb,
|
|
offset, length, "EnergyWise");
|
|
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,
|
|
20, "Encrypted Data");
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 24,
|
|
4, "Unknown (Seen Sequence?): %u",
|
|
tvb_get_ntohl(tvb, offset + 24));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 28,
|
|
4, "Sequence Number: %u",
|
|
tvb_get_ntohl(tvb, offset + 28));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 32,
|
|
16, "Model Number: %s",
|
|
tvb_format_stringzpad(tvb, offset + 32, 16));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 48,
|
|
2, "Unknown Pad: %x",
|
|
tvb_get_ntohs(tvb, offset + 48));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 50,
|
|
3, "Hardware Version ID: %s",
|
|
tvb_format_stringzpad(tvb, offset + 50, 3));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 53,
|
|
11, "System Serial Number: %s",
|
|
tvb_format_stringzpad(tvb, offset + 53, 11));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 64,
|
|
8, "Unknown Values");
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 72,
|
|
2, "Length of TLV table: %u",
|
|
tvb_get_ntohs(tvb, offset + 72));
|
|
proto_tree_add_text(tlv_tree, tvb, offset + 74,
|
|
2, "Number of TLVs in table: %u",
|
|
tvb_get_ntohs(tvb, offset + 74));
|
|
/*
|
|
proto_tree_add_text(tlv_tree, tvb,
|
|
offset + 76, length - 76,
|
|
"EnergyWise TLV Table");
|
|
*/
|
|
dissect_nrgyz_tlv(tvb, offset + 76,
|
|
tvb_get_ntohs(tvb, offset + 72),
|
|
tvb_get_ntohs(tvb, offset + 74),
|
|
tlv_tree);
|
|
|
|
|
|
}
|
|
offset += length;
|
|
break;
|
|
|
|
default:
|
|
if (tree) {
|
|
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;
|
|
const char *protocol_str;
|
|
guint16 address_length;
|
|
const char *address_type_str;
|
|
const 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, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x01, 4*8,
|
|
"Is a Router",
|
|
"Not a Router"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x02, 4*8,
|
|
"Is a Transparent Bridge",
|
|
"Not a Transparent Bridge"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4, "%s",
|
|
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, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x08, 4*8,
|
|
"Is a Switch",
|
|
"Not a Switch"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x10, 4*8,
|
|
"Is a Host",
|
|
"Not a Host"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x20, 4*8,
|
|
"Is IGMP capable",
|
|
"Not IGMP capable"));
|
|
proto_tree_add_text(capabilities_tree, tvb, offset, 4, "%s",
|
|
decode_boolean_bitfield(capabilities, 0x40, 4*8,
|
|
"Is a Repeater",
|
|
"Not a Repeater"));
|
|
}
|
|
|
|
static void
|
|
dissect_nrgyz_tlv(tvbuff_t *tvb, int offset, guint16 length, guint16 num,
|
|
proto_tree *tree)
|
|
{
|
|
guint32 tlvt, tlvl, ip_addr;
|
|
proto_item *it = NULL;
|
|
proto_tree *etree = NULL;
|
|
char const *ttext = NULL;
|
|
|
|
while (num-- && length >= 8) {
|
|
tlvt = tvb_get_ntohl(tvb, offset);
|
|
tlvl = tvb_get_ntohl(tvb, offset + 4);
|
|
|
|
if (length < tlvl) break;
|
|
length -= tlvl;
|
|
|
|
if (tlvl < 8) {
|
|
proto_tree_add_text(tree, tvb, offset, 8,
|
|
"TLV with invalid length %u (< 8)",
|
|
tlvl);
|
|
offset += 8;
|
|
break;
|
|
}
|
|
else {
|
|
ttext = val_to_str(tlvt, type_nrgyz_vals, "Unknown (0x%04x)");
|
|
switch (tlvt) {
|
|
case TYPE_NRGYZ_ROLE:
|
|
case TYPE_NRGYZ_DOMAIN:
|
|
case TYPE_NRGYZ_NAME:
|
|
it = proto_tree_add_text(tree, tvb, offset,
|
|
tlvl, "EnergyWise %s: %s", ttext,
|
|
tvb_format_stringzpad(tvb,
|
|
offset + 8, tlvl - 8)
|
|
);
|
|
break;
|
|
case TYPE_NRGYZ_REPLYTO:
|
|
ip_addr = tvb_get_ipv4(tvb, offset + 12);
|
|
it = proto_tree_add_text(tree, tvb, offset,
|
|
tlvl, "EnergyWise %s: %s port %u",
|
|
ttext,
|
|
ip_to_str((guint8 *)&ip_addr),
|
|
tvb_get_ntohs(tvb, offset + 10)
|
|
);
|
|
break;
|
|
default:
|
|
it = proto_tree_add_text(tree, tvb, offset,
|
|
tlvl, "EnergyWise %s TLV", ttext);
|
|
}
|
|
etree = proto_item_add_subtree(it, ett_cdp_nrgyz_tlv);
|
|
proto_tree_add_text(etree, tvb, offset, 4,
|
|
"TLV Type: %x (%s)", tlvt, ttext);
|
|
proto_tree_add_text(etree, tvb, offset + 4, 4,
|
|
"TLV Length: %u", tlvl);
|
|
switch (tlvt) {
|
|
case TYPE_NRGYZ_ROLE:
|
|
case TYPE_NRGYZ_DOMAIN:
|
|
case TYPE_NRGYZ_NAME:
|
|
proto_tree_add_text(etree, tvb, offset + 8,
|
|
tlvl - 8, "%s %s", ttext,
|
|
tvb_format_stringzpad(tvb,
|
|
offset + 8, tlvl - 8)
|
|
);
|
|
break;
|
|
case TYPE_NRGYZ_REPLYTO:
|
|
ip_addr = tvb_get_ipv4(tvb, offset + 12);
|
|
proto_tree_add_text(etree, tvb, offset + 8, 2,
|
|
"Unknown Field");
|
|
proto_tree_add_text(etree, tvb, offset + 10, 2,
|
|
"Port %d",
|
|
tvb_get_ntohs(tvb, offset + 10)
|
|
);
|
|
proto_tree_add_text(etree, tvb, offset + 12, 4,
|
|
"IP Address %s",
|
|
ip_to_str((guint8 *)&ip_addr)
|
|
);
|
|
proto_tree_add_text(etree, tvb, offset + 16, 2,
|
|
"Unknown Field (Backup server Port?)");
|
|
proto_tree_add_text(etree, tvb, offset + 18, 4,
|
|
"Unknown Field (Backup Server IP?)");
|
|
break;
|
|
default:
|
|
if (tlvl > 8) {
|
|
proto_tree_add_text(etree, tvb, offset + 8,
|
|
tlvl - 8, "Data");
|
|
}
|
|
}
|
|
offset += tlvl;
|
|
}
|
|
}
|
|
if (length) {
|
|
proto_tree_add_text(tree, tvb, offset, length,
|
|
"Invalid garbage at end");
|
|
}
|
|
}
|
|
|
|
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 = (int)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,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_cdp_ttl,
|
|
{ "TTL", "cdp.ttl", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_cdp_checksum,
|
|
{ "Checksum", "cdp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_cdp_checksum_good,
|
|
{ "Good", "cdp.checksum_good", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"True: checksum matches packet content; False: doesn't match content or not checked", HFILL }},
|
|
|
|
{ &hf_cdp_checksum_bad,
|
|
{ "Bad", "cdp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
"True: checksum doesn't match packet content; False: matches content or not checked", HFILL }},
|
|
|
|
{ &hf_cdp_tlvtype,
|
|
{ "Type", "cdp.tlv.type", FT_UINT16, BASE_HEX, VALS(type_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_cdp_tlvlength,
|
|
{ "Length", "cdp.tlv.len", FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_cdp,
|
|
&ett_cdp_tlv,
|
|
&ett_cdp_nrgyz_tlv,
|
|
&ett_cdp_address,
|
|
&ett_cdp_capabilities,
|
|
&ett_cdp_checksum
|
|
};
|
|
|
|
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);
|
|
}
|