235 lines
6 KiB
C
235 lines
6 KiB
C
/* packet-dtp.c
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* Routines for the disassembly for Cisco Dynamic Trunking Protocol
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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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* DTP support added by Charlie Lenahan <clenahan@fortresstech.com>
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*
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* Additional information comes from Yersinia (http://www.yersinia.net/)
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* by Alfredo Andres and David Barroso
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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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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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/*
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* It's incomplete, and it appears to be inaccurate in a number of places,
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* but it's all I could find....
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*/
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static int proto_dtp = -1;
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static int hf_dtp_version = -1;
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static int hf_dtp_tlvtype = -1;
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static int hf_dtp_tlvlength = -1;
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static int hf_dtp_some_mac = -1;
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static gint ett_dtp = -1;
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static gint ett_dtp_tlv = -1;
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static void dissect_dtp_tlv(tvbuff_t *tvb, int offset, int length, proto_tree *tree, proto_item *ti, guint8 type);
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#define TYPE_DOMAIN 0x01
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#define TYPE_STATUS 0x02
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#define TYPE_DTPTYPE 0x03
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#define TYPE_NEIGHBOR 0x04
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static const value_string dtp_tlv_type_vals[] = {
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{ TYPE_DOMAIN, "Domain" },
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{ TYPE_STATUS, "Status" },
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{ TYPE_DTPTYPE, "Type" },
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{ TYPE_NEIGHBOR, "Neighbor" },
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{ 0, NULL }
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};
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static void
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dissect_dtp(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 *dtp_tree = NULL;
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proto_tree *tlv_tree=NULL;
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int offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DTP");
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col_set_str(pinfo->cinfo, COL_INFO, "Dynamic Trunking Protocol");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_dtp, tvb, offset, -1, ENC_NA);
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dtp_tree = proto_item_add_subtree(ti, ett_dtp);
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}
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/* We assume version */
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proto_tree_add_item(dtp_tree, hf_dtp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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int type, length, valuelength;
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type = tvb_get_ntohs(tvb, offset);
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length = tvb_get_ntohs(tvb, offset + 2);
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valuelength = (length-4);
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/* make sure still in valid tlv */
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if ((valuelength < 1) || ( length > tvb_length_remaining(tvb, offset) ))
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break;
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ti = proto_tree_add_text(dtp_tree, tvb, offset, length, "%s",
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val_to_str(type, dtp_tlv_type_vals, "Unknown TLV type: 0x%02x"));
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tlv_tree = proto_item_add_subtree(ti, ett_dtp_tlv);
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proto_tree_add_uint(tlv_tree, hf_dtp_tlvtype, tvb, offset, 2, type);
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offset+=2;
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proto_tree_add_uint(tlv_tree, hf_dtp_tlvlength, tvb, offset, 2, length);
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offset+=2;
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if (valuelength > 0) {
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dissect_dtp_tlv(tvb, offset, valuelength, tlv_tree, ti, (guint8) type);
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}
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offset += valuelength;
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}
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}
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static void
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dissect_dtp_tlv(tvbuff_t *tvb, int offset, int length,
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proto_tree *tree, proto_item *ti, guint8 type)
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{
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switch (type) {
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case TYPE_DOMAIN:
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if (length > 0) {
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proto_item_set_text(ti, "Domain: %s", tvb_format_text(tvb, offset, length - 1));
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proto_tree_add_text(tree, tvb, offset, length, "Domain: %s", tvb_format_text(tvb, offset, length - 1));
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} else {
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proto_item_set_text(ti, "Domain: Bad length %u", length);
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proto_tree_add_text(tree, tvb, offset, length, "Domain: Bad length %u", length);
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}
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break;
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case TYPE_STATUS:
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if (length > 0) {
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proto_item_set_text(ti,
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"Status: 0x%02x",
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tvb_get_guint8(tvb, offset));
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proto_tree_add_text(tree, tvb, offset, 1,
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"Status: 0x%02x",
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tvb_get_guint8(tvb, offset));
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} else {
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proto_item_set_text(ti,
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"Status: Bad length %u",
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length);
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proto_tree_add_text(tree, tvb, offset, length,
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"Status: Bad length %u",
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length);
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}
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break;
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case TYPE_DTPTYPE:
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if (length > 0) {
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proto_item_set_text(ti,
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"Dtptype: 0x%02x",
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tvb_get_guint8(tvb, offset));
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proto_tree_add_text(tree, tvb, offset, 1,
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"Dtptype: 0x%02x",
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tvb_get_guint8(tvb, offset));
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} else {
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proto_item_set_text(ti,
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"Dtptype: Bad length %u",
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length);
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proto_tree_add_text(tree, tvb, offset, length,
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"Dtptype: Bad length %u",
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length);
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}
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break;
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case TYPE_NEIGHBOR:
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if (length == 6) {
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proto_item_set_text(ti, "Neighbor: %s",
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tvb_ether_to_str(tvb, offset)); /* XXX - resolve? */
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proto_tree_add_item(tree, hf_dtp_some_mac, tvb, offset, length, ENC_NA);
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} else {
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proto_item_set_text(ti,
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"Neighbor: Bad length %u",
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length);
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proto_tree_add_text(tree, tvb, offset, length,
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"Neighbor: Bad length %u",
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length);
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}
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break;
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default:
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proto_tree_add_text(tree, tvb, offset, length, "Data");
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break;
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}
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}
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void
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proto_register_dtp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dtp_version,
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{ "Version", "dtp.version", FT_UINT8, BASE_HEX,
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NULL, 0x0, NULL, HFILL }},
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{ &hf_dtp_tlvtype,
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{ "Type", "dtp.tlv_type", FT_UINT16, BASE_HEX,
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VALS(dtp_tlv_type_vals), 0x0, NULL, HFILL }},
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{ &hf_dtp_tlvlength,
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{ "Length", "dtp.tlv_len", FT_UINT16, BASE_DEC,
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NULL, 0x0, NULL, HFILL }},
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{ &hf_dtp_some_mac,
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{ "Neighbor", "dtp.neighbor", FT_ETHER, BASE_NONE,
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NULL, 0x0, "MAC Address of neighbor", HFILL }},
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};
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static gint *ett[] = {
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&ett_dtp,
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&ett_dtp_tlv,
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};
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proto_dtp = proto_register_protocol("Dynamic Trunking Protocol", "DTP", "dtp");
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proto_register_field_array(proto_dtp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_dtp(void)
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{
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dissector_handle_t dtp_handle;
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dtp_handle = create_dissector_handle(dissect_dtp, proto_dtp);
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dissector_add_uint("llc.cisco_pid", 0x2004, dtp_handle);
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}
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