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/* packet-rmt-norm.c
* Reliable Multicast Transport (RMT)
* NORM Protocol Instantiation dissector
* Copyright 2005, Stefano Pettini <spettini@users.sourceforge.net>
*
* Negative-acknowledgment (NACK)-Oriented Reliable Multicast (NORM):
* ------------------------------------------------------------------
*
* This protocol is designed to provide end-to-end reliable transport of
* bulk data objects or streams over generic IP multicast routing and
* forwarding services. NORM uses a selective, negative acknowledgment
* mechanism for transport reliability and offers additional protocol
* mechanisms to allow for operation with minimal "a priori"
* coordination among senders and receivers.
*
* References:
* RFC 3490, Negative-acknowledgment (NACK)-Oriented Reliable Multicast (NORM) Protocol
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include "packet-rmt-norm.h"
/* String tables */
const value_string string_norm_type[] =
{
{ 1, "NORM_INFO" },
{ 2, "NORM_DATA" },
{ 3, "NORM_CMD" },
{ 4, "NORM_NACK" },
{ 5, "NORM_ACK" },
{ 6, "NORM_REPORT" },
{ 0, NULL }
};
/* Initialize the protocol and registered fields */
/* ============================================= */
static int proto = -1;
static struct _norm_hf hf;
static struct _norm_ett ett;
static gboolean preferences_initialized = FALSE;
static struct _norm_prefs preferences;
static struct _norm_prefs preferences_old;
/* Preferences */
/* =========== */
/* Set/Reset preferences to default values */
static void norm_prefs_set_default(struct _norm_prefs *prefs)
{
fec_prefs_set_default(&prefs->fec);
}
/* Register preferences */
static void norm_prefs_register(struct _norm_prefs *prefs, module_t *module)
{
fec_prefs_register(&prefs->fec, module);
}
/* Save preferences to alc_prefs_old */
static void norm_prefs_save(struct _norm_prefs *p, struct _norm_prefs *p_old)
{
*p_old = *p;
}
/* Code to actually dissect the packets */
/* ==================================== */
static void dissect_norm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Logical packet representation */
struct _norm norm;
/* Offset for subpacket dissection */
guint offset;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *norm_tree;
/* Structures and variables initialization */
offset = 0;
memset(&norm, 0, sizeof(struct _norm));
/* Update packet info */
pinfo->current_proto = "NORM";
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NORM");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
/* NORM header dissection, part 1 */
/* ------------------------------ */
norm.version = hi_nibble(tvb_get_guint8(tvb, offset));
if (tree)
{
/* Create subtree for the NORM protocol */
ti = proto_tree_add_item(tree, proto, tvb, offset, -1, FALSE);
norm_tree = proto_item_add_subtree(ti, ett.main);
/* Fill the NORM subtree */
proto_tree_add_uint(norm_tree, hf.version, tvb, offset, 1, norm.version);
} else
norm_tree = NULL;
/* This dissector supports only NORMv1 packets.
* If norm.version > 1 print only version field and quit.
*/
if (norm.version == 1) {
/* NORM header dissection, part 2 */
/* ------------------------------ */
norm.type = lo_nibble(tvb_get_guint8(tvb, offset));
norm.hlen = tvb_get_guint8(tvb, offset+1);
norm.sequence = tvb_get_ntohs(tvb, offset+2);
norm.source_id = tvb_get_ntohl(tvb, offset+4);
if (tree)
{
proto_tree_add_uint(norm_tree, hf.type, tvb, offset, 1, norm.type);
proto_tree_add_uint(norm_tree, hf.hlen, tvb, offset+1, 1, norm.hlen);
proto_tree_add_uint(norm_tree, hf.sequence, tvb, offset+2, 2, norm.sequence);
proto_tree_add_uint(norm_tree, hf.source_id, tvb, offset+4, 4, norm.source_id);
}
offset += 8;
/* Add the Payload item */
if (tvb_length(tvb) > offset)
proto_tree_add_none_format(norm_tree, hf.payload, tvb, offset, -1, "Payload (%u bytes)", tvb_length(tvb) - offset);
/* Complete entry in Info column on summary display */
/* ------------------------------------------------ */
if (check_col(pinfo->cinfo, COL_INFO))
switch (norm.type)
{
case 1:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "INFO");
break;
case 2:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "DATA");
break;
case 3:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "CMD");
break;
case 4:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "NACK");
break;
case 5:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "ACK");
break;
case 6:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "REPORT");
break;
default:
col_append_sep_str(pinfo->cinfo, COL_INFO, " ", "Unknown type");
break;
}
} else {
if (tree)
proto_tree_add_text(norm_tree, tvb, 0, -1, "Sorry, this dissector supports NORM version 1 only");
/* Complete entry in Info column on summary display */
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "Version: %u (not supported)", norm.version);
}
}
void proto_reg_handoff_norm(void)
{
static dissector_handle_t handle;
if (!preferences_initialized)
{
preferences_initialized = TRUE;
handle = create_dissector_handle(dissect_norm, proto);
dissector_add_handle("udp.port", handle);
}
norm_prefs_save(&preferences, &preferences_old);
}
void proto_register_norm(void)
{
/* Setup NORM header fields */
static hf_register_info hf_ptr[] = {
{ &hf.version,
{ "Version", "norm.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf.type,
{ "Message Type", "norm.type", FT_UINT8, BASE_DEC, VALS(string_norm_type), 0x0, "", HFILL }},
{ &hf.hlen,
{ "Header length", "norm.hlen", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf.sequence,
{ "Sequence", "norm.sequence", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf.source_id,
{ "Source ID", "norm.source_id", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }},
FEC_FIELD_ARRAY(hf.fec, "alc"),
{ &hf.payload,
{ "Payload", "norm.payload", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }}
};
/* Setup protocol subtree array */
static gint *ett_ptr[] = {
&ett.main,
FEC_SUBTREE_ARRAY(ett.fec)
};
module_t *module;
/* Clear hf and ett fields */
memset(&hf, 0xff, sizeof(struct _norm_hf));
memset(&ett, 0xff, sizeof(struct _norm_ett));
/* Register the protocol name and description */
proto = proto_register_protocol("Negative-acknowledgment Oriented Reliable Multicast", "NORM", "norm");
/* Register the header fields and subtrees used */
proto_register_field_array(proto, hf_ptr, array_length(hf_ptr));
proto_register_subtree_array(ett_ptr, array_length(ett_ptr));
/* Reset preferences */
norm_prefs_set_default(&preferences);
norm_prefs_save(&preferences, &preferences_old);
/* Register preferences */
module = prefs_register_protocol(proto, proto_reg_handoff_norm);
norm_prefs_register(&preferences, module);
}
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