/* packet-ismp.c
 * Routines for ISMP dissection
 * Enterasys Networks Home: http://www.enterasys.com/
 * Copyright 2003, Joshua Craig Douglas <jdouglas@enterasys.com>
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <glib.h>

#include <epan/packet.h>
#include <epan/to_str.h>
#include <epan/strutil.h>
#include <epan/etypes.h>


/* Initialize the protocol and registered fields */
static int proto_ismp = -1;
static int hf_ismp_version = -1;
static int hf_ismp_message_type = -1;
static int hf_ismp_seq_num = -1;
static int hf_ismp_code_length = -1;
static int hf_ismp_auth_data = -1;

/* Enterasys/Cabletron Dicovery Protocol fields*/
static int hf_ismp_edp = -1;
static int hf_ismp_edp_version = -1;
static int hf_ismp_edp_module_ip = -1;
static int hf_ismp_edp_module_mac = -1;
static int hf_ismp_edp_module_port = -1;
static int hf_ismp_edp_chassis_mac =-1;
static int hf_ismp_edp_chassis_ip = -1;
static int hf_ismp_edp_device_type = -1;
static int hf_ismp_edp_module_rev = -1;
static int hf_ismp_edp_options = -1;
static int hf_ismp_edp_sfs_option_unused1 = -1;
static int hf_ismp_edp_sfs_option_sfssup = -1;
static int hf_ismp_edp_sfs_option_lsp = -1;
static int hf_ismp_edp_sfs_option_flood = -1;
static int hf_ismp_edp_sfs_option_resolve = -1;
static int hf_ismp_edp_sfs_option_unused2 = -1;
static int hf_ismp_edp_sfs_option_tagflood = -1;
static int hf_ismp_edp_sfs_option_calltap = -1;
static int hf_ismp_edp_sfs_option_conmsg = -1;
static int hf_ismp_edp_sfs_option_redun = -1;
static int hf_ismp_edp_sfs_option_isolated = -1;
static int hf_ismp_edp_sfs_option_uplink_switch = -1;
static int hf_ismp_edp_sfs_option_uplink_core = -1;
static int hf_ismp_edp_sfs_option_uplink_port = -1;
static int hf_ismp_edp_sfs_option_uplink_flood = -1;
static int hf_ismp_edp_rtr_option_ssr = -1;
static int hf_ismp_edp_rtr_option_igmp = -1;
static int hf_ismp_edp_rtr_option_rip = -1;
static int hf_ismp_edp_rtr_option_bgp = -1;
static int hf_ismp_edp_rtr_option_ospf = -1;
static int hf_ismp_edp_rtr_option_dvmrp = -1;
static int hf_ismp_edp_rtr_option_8021q = -1;
static int hf_ismp_edp_rtr_option_gvrp = -1;
static int hf_ismp_edp_rtr_option_gmrp = -1;
static int hf_ismp_edp_rtr_option_igmp_snoop = -1;
static int hf_ismp_edp_rtr_option_route = -1;
static int hf_ismp_edp_rtr_option_trans = -1;
static int hf_ismp_edp_rtr_option_level1 = -1;
static int hf_ismp_edp_switch_option_8021q = -1;
static int hf_ismp_edp_switch_option_gvrp = -1;
static int hf_ismp_edp_switch_option_gmrp = -1;
static int hf_ismp_edp_switch_option_igmp = -1;
static int hf_ismp_edp_switch_option_route = -1;
static int hf_ismp_edp_switch_option_trans = -1;
static int hf_ismp_edp_switch_option_level1 = -1;
static int hf_ismp_edp_end_station_option_dhcp = -1;
static int hf_ismp_edp_end_station_option_dns = -1;
static int hf_ismp_edp_end_station_option_ad = -1;
static int hf_ismp_edp_num_neighbors = -1;
static int hf_ismp_edp_neighbors = -1;
static int hf_ismp_edp_num_tuples = -1;
static int hf_ismp_edp_tuples = -1;


/* Initialize the subtree pointers */
static gint ett_ismp = -1;
static gint ett_ismp_edp = -1;
static gint ett_ismp_edp_options = -1;
static gint ett_ismp_edp_neighbors = -1;
static gint ett_ismp_edp_neighbors_leaf = -1;
static gint ett_ismp_edp_tuples = -1;
static gint ett_ismp_edp_tuples_leaf = -1;

/* ISMP TYPES */
#define ISMPTYPE_EDP	2


/* EDP DEVICE TYPES */
#define EDP_DEVICE_TYPE_SFS17		1
#define EDP_DEVICE_TYPE_SFS18		2
#define EDP_DEVICE_TYPE_ROUTER		3
#define EDP_DEVICE_TYPE_BRIDGE		4
#define EDP_DEVICE_TYPE_VLANMAN		5
#define EDP_DEVICE_TYPE_NTSERVER	6
#define	EDP_DEVICE_TYPE_NTCLIENT	7
#define EDP_DEVICE_TYPE_WIN95		8
#define EDP_DEVICE_TYPE_WIN98		9
#define EDP_DEVICE_TYPE_UNIXSERVER	10
#define EDP_DEVICE_TYPE_UNIXCLIENT	11
#define EDP_DEVICE_TYPE_ACCESSPOINT	12


static const value_string edp_device_types[] = {
        { EDP_DEVICE_TYPE_SFS17,       "Network Switch running SecureFast version 1.7 or lower" },
        { EDP_DEVICE_TYPE_SFS18,         "Network Switch running SecureFast version 1.8 or greater" },
        { EDP_DEVICE_TYPE_ROUTER,         "Router" },
        { EDP_DEVICE_TYPE_BRIDGE,         "Bridge" },
        { EDP_DEVICE_TYPE_VLANMAN,         "Cabletron VLAN Manager" },
        { EDP_DEVICE_TYPE_NTSERVER,         "Network Server (NT)" },
        { EDP_DEVICE_TYPE_NTCLIENT,    "Network Workstation (NT)" },
        { EDP_DEVICE_TYPE_WIN95,     "Windows95" },
        { EDP_DEVICE_TYPE_WIN98,        "Windows98" },
        { EDP_DEVICE_TYPE_UNIXSERVER,       "UNIX Server" },
        { EDP_DEVICE_TYPE_UNIXCLIENT, "UNIX Workstation" },
        { EDP_DEVICE_TYPE_ACCESSPOINT,     "Roamabout wireless access point" },
        { 0,                    NULL },
};


/* EDP SFS Options */
#define EDP_SFS_OPTION_UNUSED1		0x1
#define EDP_SFS_OPTION_SFSSUP		0x2
#define EDP_SFS_OPTION_LSP		0x4
#define EDP_SFS_OPTION_FLOOD		0x8
#define EDP_SFS_OPTION_RESOLVE		0x10
#define EDP_SFS_OPTION_UNUSED2		0x20
#define EDP_SFS_OPTION_TAGFLOOD		0x40
#define EDP_SFS_OPTION_CALLTAP		0x80
#define EDP_SFS_OPTION_CONMSG		0x100
#define EDP_SFS_OPTION_REDUN		0x200
#define EDP_SFS_OPTION_ISOLATED		0x400
#define EDP_SFS_OPTION_UPLINK_SWITCH	0x800
#define EDP_SFS_OPTION_UPLINK_CORE	0x1000
#define EDP_SFS_OPTION_UPLINK_PORT	0x2000
#define EDP_SFS_OPTION_UPLINK_FLOOD	0x4000

/* EDP Router Options */
#define EDP_RTR_OPTION_SSR		0x1
#define EDP_RTR_OPTION_IGMP		0x2
#define EDP_RTR_OPTION_RIP		0x4
#define EDP_RTR_OPTION_BGP		0x8
#define EDP_RTR_OPTION_OSPF		0x10
#define EDP_RTR_OPTION_DVMRP		0x20
#define EDP_RTR_OPTION_8021Q		0x40
#define EDP_RTR_OPTION_GVRP		0x80
#define EDP_RTR_OPTION_GMRP		0x100
#define EDP_RTR_OPTION_IGMP_SNOOP	0x200
#define EDP_RTR_OPTION_ROUTE		0x400
#define EDP_RTR_OPTION_TRANS		0x800
#define EDP_RTR_OPTION_LEVEL1		0x1000

/* EDP Switch Options */
#define EDP_SWITCH_OPTION_8021Q		0x1
#define EDP_SWITCH_OPTION_GVRP		0x2
#define EDP_SWITCH_OPTION_GMRP		0x4
#define EDP_SWITCH_OPTION_IGMP		0x8
#define EDP_SWITCH_OPTION_ROUTE		0x10
#define EDP_SWITCH_OPTION_TRANS		0x20
#define EDP_SWITCH_OPTION_LEVEL1	0x40

/* EDP End Station and Server Options */
#define EDP_END_STATION_OPTION_DHCP	0x1
#define EDP_END_STATION_OPTION_DNS	0x2
#define EDP_END_STATION_OPTION_AD	0x4

/* EDP Tuple Types */
#define EDP_TUPLE_UNKNOWN		0
#define EDP_TUPLE_HOLD			1
#define EDP_TUPLE_INT_NAME		2
#define EDP_TUPLE_SYS_DESCRIPT	3
#define EDP_TUPLE_IPX_ADDR		4

static const value_string edp_tuple_types[] =
{
	{ EDP_TUPLE_UNKNOWN,"Unknown" },
	{ EDP_TUPLE_HOLD,"Hold Time" },
	{ EDP_TUPLE_INT_NAME,"Interface Name" },
	{ EDP_TUPLE_SYS_DESCRIPT,"System Description" },
	{ EDP_TUPLE_IPX_ADDR,"IPX Address" },
	{ 0,NULL }
};

/* Is value set? */
static const true_false_string is_set = {
        "set",
        "not set"
};


/* Function to dissect EDP portion of ISMP message */
static void
dissect_ismp_edp(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree *ismp_tree)
{
	/* local variables used for EDP dissection */
	int neighbors_count = 0;
	int tuples_count = 0;
	guint16 device_type = 0;
	guint32	options = 0;
	guint16 num_neighbors = 0;
	guint16 num_tuples = 0;
	guint16 tuple_type = 0;
	guint16 tuple_length = 0;

	/* Set up structures needed to add the protocol subtree and manage it */
	proto_item *edp_ti;
	proto_tree *edp_tree;

	proto_item *edp_options_ti;
	proto_tree *edp_options_tree;

	proto_item *edp_neighbors_ti;
	proto_tree *edp_neighbors_tree;

	proto_item *edp_neighbors_leaf_ti;
	proto_tree *edp_neighbors_leaf_tree;

	proto_item *edp_tuples_ti;
	proto_tree *edp_tuples_tree;

	proto_item *edp_tuples_leaf_ti;
	proto_tree *edp_tuples_leaf_tree;

	/* add column iformation marking this as EDP (Enterasys Discover Protocol */
	col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISMP.EDP");
	col_clear(pinfo->cinfo, COL_INFO);

	/* create display subtree for EDP */
	if (ismp_tree) {
		edp_ti  = proto_tree_add_item(ismp_tree, hf_ismp_edp, tvb, offset,
			tvb_length_remaining(tvb, offset), ENC_NA);
		edp_tree = proto_item_add_subtree(edp_ti, ett_ismp_edp);

		col_add_fstr(pinfo->cinfo, COL_INFO, "MIP %s, MMAC %s, ifIdx %d",
			tvb_ip_to_str(tvb, offset+2),
			tvb_ether_to_str(tvb, offset+6),
			tvb_get_ntohl(tvb, offset+12));

		proto_tree_add_item(edp_tree, hf_ismp_edp_version, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		proto_tree_add_item(edp_tree, hf_ismp_edp_module_ip, tvb, offset, 4, ENC_BIG_ENDIAN);
		offset += 4;
		proto_tree_add_item(edp_tree, hf_ismp_edp_module_mac, tvb, offset, 6, ENC_NA);
		offset += 6;
		proto_tree_add_item(edp_tree, hf_ismp_edp_module_port, tvb, offset, 4, ENC_BIG_ENDIAN);
		offset += 4;
		proto_tree_add_item(edp_tree, hf_ismp_edp_chassis_mac, tvb, offset, 6, ENC_NA);
		offset += 6;
		proto_tree_add_item(edp_tree, hf_ismp_edp_chassis_ip, tvb, offset, 4, ENC_BIG_ENDIAN);
		offset += 4;
		device_type = tvb_get_ntohs(tvb, offset);
		proto_tree_add_item(edp_tree, hf_ismp_edp_device_type, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		proto_tree_add_uint_format_value(edp_tree, hf_ismp_edp_module_rev, tvb, offset, 4, tvb_get_ntohl(tvb, offset),
			"%02x.%02x.%02x.%02x", tvb_get_guint8(tvb, offset),
			tvb_get_guint8(tvb, offset+1), tvb_get_guint8(tvb, offset+2), tvb_get_guint8(tvb, offset+3));
		offset += 4;

		/* create display subtree for EDP options */
		options = tvb_get_ntohl(tvb, offset);
		edp_options_ti = proto_tree_add_uint_format(edp_tree, hf_ismp_edp_options, tvb, offset, 4,
			options,"Options: 0x%08x",options);
		edp_options_tree = proto_item_add_subtree(edp_options_ti, ett_ismp_edp_options);

		/* depending on device_type, show the appropriate options */
		switch (device_type) {
			case EDP_DEVICE_TYPE_SFS17:
			case EDP_DEVICE_TYPE_SFS18:
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_flood, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_port, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_core, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_uplink_switch, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_isolated, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_redun, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_conmsg, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_calltap, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_tagflood, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_unused2, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_resolve, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_flood, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_lsp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_sfssup, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_sfs_option_unused1, tvb, offset, 4, ENC_BIG_ENDIAN);
				break;
			case EDP_DEVICE_TYPE_ROUTER:
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_level1, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_trans, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_route, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_igmp_snoop, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_gmrp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_gvrp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_8021q, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_dvmrp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_ospf, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_bgp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_rip, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_igmp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_rtr_option_ssr, tvb, offset, 4, ENC_BIG_ENDIAN);
				break;
			case EDP_DEVICE_TYPE_BRIDGE:
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_level1, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_trans, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_route, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_igmp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_gmrp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_gvrp, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_switch_option_8021q, tvb, offset, 4, ENC_BIG_ENDIAN);
				break;
			case EDP_DEVICE_TYPE_VLANMAN:
				break;
			case EDP_DEVICE_TYPE_NTSERVER:
			case EDP_DEVICE_TYPE_NTCLIENT:
			case EDP_DEVICE_TYPE_WIN95:
			case EDP_DEVICE_TYPE_WIN98:
			case EDP_DEVICE_TYPE_UNIXSERVER:
			case EDP_DEVICE_TYPE_UNIXCLIENT:
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_ad, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_dns, tvb, offset, 4, ENC_BIG_ENDIAN);
				proto_tree_add_item(edp_options_tree, hf_ismp_edp_end_station_option_dhcp, tvb, offset, 4, ENC_BIG_ENDIAN);
				break;
			case EDP_DEVICE_TYPE_ACCESSPOINT:
			default:
				break;
		}
		offset += 4;

		/* determine the number of neighbors and create EDP neighbors subtree */
		num_neighbors = tvb_get_ntohs(tvb, offset);
		proto_tree_add_item(edp_tree, hf_ismp_edp_num_neighbors, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		if (num_neighbors > 0)
		{
			edp_neighbors_ti = proto_tree_add_item(edp_tree, hf_ismp_edp_neighbors, tvb,
										offset, num_neighbors*10, ENC_NA);
			edp_neighbors_tree = proto_item_add_subtree(edp_neighbors_ti, ett_ismp_edp_neighbors);
			while ( neighbors_count < num_neighbors && tvb_reported_length_remaining(tvb, offset) >= 10)
			{
				edp_neighbors_leaf_ti = proto_tree_add_text(edp_neighbors_tree, tvb, offset, 10,
										"Neighbor%d", (neighbors_count+1));
				edp_neighbors_leaf_tree = proto_item_add_subtree(edp_neighbors_leaf_ti, ett_ismp_edp_neighbors_leaf);

				proto_tree_add_text(edp_neighbors_leaf_tree, tvb, offset, 6,
					"MAC Address: %s", tvb_ether_to_str(tvb, offset));
				proto_tree_add_text(edp_neighbors_leaf_tree, tvb, offset, 4,
					"Assigned Neighbor State 0x%04x", tvb_get_ntohl(tvb, offset));
				offset += 10;
				neighbors_count++;
			}
			if (neighbors_count != num_neighbors)
			{
				proto_tree_add_text(edp_tree, tvb, offset, tvb_reported_length_remaining(tvb, offset),
				"MALFORMED PACKET");
				return;
			}
		}

		/* determine data remains, if so, count tuples
		   and create EDP tuples subtree */
		if (tvb_reported_length_remaining(tvb, offset) != 0 &&
			tvb_reported_length_remaining(tvb, offset) >= 2)
		{
			num_tuples = tvb_get_ntohs(tvb, offset);
			proto_tree_add_item(edp_tree, hf_ismp_edp_num_tuples, tvb, offset, 2, ENC_BIG_ENDIAN);
			offset += 2;
		}
		else if (tvb_reported_length_remaining(tvb, offset) > 0) {
			proto_tree_add_text(edp_tree, tvb, offset,
				tvb_reported_length_remaining(tvb, offset), "MALFORMED PACKET");
			return;
		}
		else
		{
			return;
		}

		/* start populating tuple information */
		if (num_tuples && tvb_reported_length_remaining(tvb, offset) >= 4)
		{
			edp_tuples_ti = proto_tree_add_bytes_format(edp_tree, hf_ismp_edp_tuples, tvb,
				offset, tvb_reported_length_remaining(tvb, offset), NULL, "Tuples");
			edp_tuples_tree = proto_item_add_subtree(edp_tuples_ti, ett_ismp_edp_tuples);

			while ( (tuples_count < num_tuples) && (tvb_reported_length_remaining(tvb, offset) >= 4) )
			{

				tuple_length = tvb_get_ntohs(tvb, offset+2);
				edp_tuples_leaf_ti = proto_tree_add_text(edp_tuples_tree, tvb, offset, tuple_length,
					"Tuple%d", tuples_count+1);

				edp_tuples_leaf_tree = proto_item_add_subtree(edp_tuples_leaf_ti, ett_ismp_edp_tuples_leaf);

				tuple_type = tvb_get_ntohs(tvb, offset);
				proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, 2,
					"Tuple Type: %s(%d)", val_to_str_const( tuple_type, edp_tuple_types, "Unknown"), tuple_type );
				offset += 2;
				proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, 2,
					"Tuple Length: %d", tuple_length);
				offset += 2;

				if (tvb_reported_length_remaining(tvb, offset) >= tuple_length)
				{
					tvb_ensure_bytes_exist(tvb, offset, tuple_length);
					switch (tuple_type)
					{
						case EDP_TUPLE_HOLD:
							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
								"Hold Time = %d", tvb_get_ntohs(tvb, offset));
							break;
						case EDP_TUPLE_INT_NAME:
							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
								"Interface Name = %s", tvb_format_text(tvb, offset, tuple_length));
							col_append_fstr(pinfo->cinfo, COL_INFO, ", ifName %s",
								tvb_format_text(tvb, offset, tuple_length));
							break;
						case EDP_TUPLE_SYS_DESCRIPT:
							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
								"System Description = %s", tvb_format_text(tvb, offset, tuple_length));
							break;
						case EDP_TUPLE_IPX_ADDR:
							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
								"Interface IPX_address = %s",
								ipx_addr_to_str(tvb_get_ntohl(tvb, offset),
								tvb_get_string(wmem_packet_scope(), tvb, offset+4, tuple_length-4)));
							break;
						case EDP_TUPLE_UNKNOWN:
						default:
							proto_tree_add_text(edp_tuples_leaf_tree, tvb, offset, tuple_length,
								"Unknown Tuple Data %s", tvb_format_text(tvb, offset, tuple_length));
							break;
					}
				}
				offset += tuple_length;

				tuples_count++;
			}
			if (tuples_count != num_tuples)
			{
				proto_tree_add_text(edp_tree, tvb, offset,
					tvb_reported_length_remaining(tvb, offset), "MALFORMED PACKET");
				return;
			}
			else
			{
				return;
			}
		}

	}


}


/* Code to actually dissect the packets */
static void
dissect_ismp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
	int offset = 0;
	guint16 message_type = 0;
	guint8 code_length = 0;
	guint8 weird_stuff[3] = { 0x42, 0x42, 0x03 };

/* Set up structures needed to add the protocol subtree and manage it */
	proto_item *ti;
	proto_tree *ismp_tree;

/* Make entries in Protocol column and Info column on summary display */
	col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISMP");
	col_clear(pinfo->cinfo, COL_INFO);

	/*
	 * XXX - I've seen captures with packets that have the ISMP
	 * Ethernet frame type, but with the payload being 0x42 0x42 0x03
	 * followed by what appears to be an ISMP frame.
	 *
	 * 0x4242 is not a valid ISMP version number.
	 */
	if (tvb_memeql(tvb, offset, weird_stuff, sizeof weird_stuff) == 0)
		offset += 3;	/* skip the weird stuff, for now */
	if (tree) {
		/* create display subtree for ismp */
		ti = proto_tree_add_item(tree, proto_ismp, tvb, offset, -1, ENC_NA);

		ismp_tree = proto_item_add_subtree(ti, ett_ismp);

		/* add an items to the subtree */
		proto_tree_add_item(ismp_tree, hf_ismp_version, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		message_type = tvb_get_ntohs(tvb, offset);
		proto_tree_add_item(ismp_tree, hf_ismp_message_type, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		proto_tree_add_item(ismp_tree, hf_ismp_seq_num, tvb, offset, 2, ENC_BIG_ENDIAN);
		offset += 2;
		code_length = tvb_get_guint8(tvb, offset);
		proto_tree_add_item(ismp_tree, hf_ismp_code_length, tvb, offset, 1, ENC_BIG_ENDIAN);
		offset += 1;
		proto_tree_add_item(ismp_tree, hf_ismp_auth_data, tvb, offset, code_length, ENC_NA);
		offset += code_length;

		/* if Enterasys Discover Protocol, dissect it */
		if(message_type == ISMPTYPE_EDP)
			dissect_ismp_edp(tvb, pinfo, offset, tree);
	}

}


/* Register this protocol with Wireshark */
void
proto_register_ismp(void)
{

/* Setup list of header fields  See Section 1.6.1 for details*/
	static hf_register_info hf[] = {
#if 0
		{ &hf_ismp,
			{ "ISMP", "ismp",
			FT_PROTOCOL, BASE_NONE, NULL, 0x0,
			"Inter Switch Message Protocol", HFILL }
		},
#endif
		{ &hf_ismp_version,
			{ "Version",           "ismp.version",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_message_type,
			{ "Message Type", "ismp.msgtype",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_seq_num,
			{ "Sequence Number", "ismp.seqnum",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_code_length,
			{ "Auth Code Length", "ismp.codelen",
			FT_UINT8, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_auth_data,
			{ "Auth Data", "ismp.authdata",
			FT_BYTES, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp,
			{ "EDP", "ismp.edp",
			FT_PROTOCOL, BASE_NONE, NULL, 0x0,
			"Enterasys Discovery Protocol", HFILL }
		},
		{ &hf_ismp_edp_version,
			{ "Version", "ismp.edp.version",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_module_ip,
			{ "Module IP Address", "ismp.edp.modip",
			FT_IPv4, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_module_mac,
			{ "Module MAC Address", "ismp.edp.modmac",
			FT_ETHER, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_module_port,
			{ "Module Port (ifIndex num)", "ismp.edp.modport",
			FT_UINT32, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_chassis_mac,
			{ "Chassis MAC Address", "ismp.edp.chassismac",
			FT_ETHER, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_chassis_ip,
			{ "Chassis IP Address", "ismp.edp.chassisip",
			FT_IPv4, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_device_type,
			{ "Device Type", "ismp.edp.devtype",
			FT_UINT16, BASE_DEC, edp_device_types, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_module_rev,
			{ "Module Firmware Revision", "ismp.edp.rev",
			FT_UINT32, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_options,
			{ "Device Options", "ismp.edp.options",
			FT_UINT32, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_unused1,
			{ "Unused", "ismp.edp.sfs_option_unused1",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UNUSED1,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_sfssup,
			{ "SFS Support", "ismp.edp.sfs_option_sfssup",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_SFSSUP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_lsp,
			{ "LSP Support", "ismp.edp.sfs_option_lsp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_LSP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_flood,
			{ "Flood Path Support", "ismp.edp.sfs_option_flood",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_FLOOD,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_resolve,
			{ "Resolve Support", "ismp.edp.sfs_option_resolve",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_RESOLVE,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_unused2,
			{ "Unused", "ismp.edp.sfs_option_unused2",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UNUSED2,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_tagflood,
			{ "Tagged Flood Support", "ismp.edp.sfs_option_tagflood",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_TAGFLOOD,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_calltap,
			{ "Call Tap Support", "ismp.edp.sfs_option_calltap",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_CALLTAP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_conmsg,
			{ "Connection Message Support", "ismp.edp.sfs_option_conmsg",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_CONMSG,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_redun,
			{ "Redundant Access Support", "ismp.edp.sfs_option_redun",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_REDUN,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_isolated,
			{ "Isolated Switch", "ismp.edp.sfs_option_isolated",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_ISOLATED,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_uplink_switch,
			{ "Uplink Switch", "ismp.edp.sfs_option_uplink_switch",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_SWITCH,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_uplink_core,
			{ "Uplink Core", "ismp.edp.sfs_option_uplink_core",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_CORE,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_uplink_port,
			{ "Uplink Port", "ismp.edp.sfs_option_uplink_port",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_PORT,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_sfs_option_uplink_flood,
			{ "Uplink Flood Support", "ismp.edp.sfs_option_uplink_flood",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SFS_OPTION_UPLINK_FLOOD,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_ssr,
			{ "SSR Type Device", "ismp.edp.rtr_option_ssr",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_SSR,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_igmp,
			{ "IGMP Active", "ismp.edp.rtr_option_igmp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_IGMP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_rip,
			{ "RIP Active", "ismp.edp.rtr_option_rip",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_RIP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_bgp,
			{ "BGP Active", "ismp.edp.rtr_option_bgp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_BGP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_ospf,
			{ "OSPF Active", "ismp.edp.rtr_option_ospf",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_OSPF,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_dvmrp,
			{ "DVMRP Active", "ismp.edp.rtr_option_dvmrp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_DVMRP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_8021q,
			{ "802.1Q Support", "ismp.edp.rtr_option_8021q",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_8021Q,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_gvrp,
			{ "GVRP Support", "ismp.edp.rtr_option_gvrp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_GVRP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_gmrp,
			{ "GMRP Support", "ismp.edp.rtr_option_gmrp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_GMRP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_igmp_snoop,
			{ "IGMP Snooping Support", "ismp.edp.rtr_option_igmp_snoop",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_IGMP_SNOOP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_route,
			{ "Route Bridging", "ismp.edp.rtr_option_route",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_ROUTE,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_trans,
			{ "Transparent Bridging", "ismp.edp.rtr_option_trans",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_TRANS,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_rtr_option_level1,
			{ "Level 1 Functionality", "ismp.edp.rtr_option_level1",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_RTR_OPTION_LEVEL1,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_8021q,
			{ "802.1Q Support", "ismp.edp.switch_option_8021q",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_8021Q,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_gvrp,
			{ "GVRP Support", "ismp.edp.switch_option_gvrp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_GVRP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_gmrp,
			{ "GMRP Support", "ismp.edp.switch_option_gmrp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_GMRP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_igmp,
			{ "IGMP Snooping Support", "ismp.edp.switch_option_igmp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_IGMP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_route,
			{ "Route Bridging", "ismp.edp.switch_option_route",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_ROUTE,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_trans,
			{ "Transparent Bridging", "ismp.edp.switch_option_trans",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_TRANS,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_switch_option_level1,
			{ "Level 1 Functionality", "ismp.edp.switch_option_level1",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_SWITCH_OPTION_LEVEL1,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_end_station_option_dhcp,
			{ "DHCP Enabled", "ismp.edp.end_station_option_dhcp",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_DHCP,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_end_station_option_dns,
			{ "DNS Enabled", "ismp.edp.end_station_option_dns",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_DNS,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_end_station_option_ad,
			{ "Active Directory Enabled", "ismp.edp.end_station_option_ad",
			FT_BOOLEAN, 32, TFS(&is_set), EDP_END_STATION_OPTION_AD,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_num_neighbors,
			{ "Number of Known Neighbors", "ismp.edp.maccount",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_neighbors,
			{ "Neighbors", "ismp.edp.nbrs",
			FT_BYTES, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_num_tuples,
			{ "Number of Tuples", "ismp.edp.numtups",
			FT_UINT16, BASE_DEC, NULL, 0x0,
			NULL, HFILL }
		},
		{ &hf_ismp_edp_tuples,
			{ "Number of Tuples", "ismp.edp.tups",
			FT_BYTES, BASE_NONE, NULL, 0x0,
			NULL, HFILL }
		},
	};

/* Setup protocol subtree array */
	static gint *ett[] = {
		&ett_ismp,
		&ett_ismp_edp,
		&ett_ismp_edp_options,
		&ett_ismp_edp_neighbors,
		&ett_ismp_edp_neighbors_leaf,
		&ett_ismp_edp_tuples,
		&ett_ismp_edp_tuples_leaf,
	};

/* Register the protocol name and description */
	proto_ismp = proto_register_protocol("InterSwitch Message Protocol",
	    "ISMP", "ismp");

/* Required function calls to register the header fields and subtrees used */
	proto_register_field_array(proto_ismp, hf, array_length(hf));
	proto_register_subtree_array(ett, array_length(ett));
}


/* If this dissector uses sub-dissector registration add a registration routine.
   This format is required because a script is used to find these routines and
   create the code that calls these routines.
*/
void
proto_reg_handoff_ismp(void)
{
	dissector_handle_t ismp_handle;

	ismp_handle = create_dissector_handle(dissect_ismp,
	    proto_ismp);
	dissector_add_uint("ethertype", ETHERTYPE_ISMP, ismp_handle);
}
