2005-01-14 11:17:35 +00:00
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/* packet-rmt-alc.c
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* Reliable Multicast Transport (RMT)
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* ALC Protocol Instantiation dissector
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* Copyright 2005, Stefano Pettini <spettini@users.sourceforge.net>
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*
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* Asynchronous Layered Coding (ALC):
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* ----------------------------------
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*
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* A massively scalable reliable content delivery protocol.
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* Asynchronous Layered Coding combines the Layered Coding Transport
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* (LCT) building block, a multiple rate congestion control building
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* block and the Forward Error Correction (FEC) building block to
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* provide congestion controlled reliable asynchronous delivery of
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* content to an unlimited number of concurrent receivers from a single
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* sender.
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*
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* References:
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* RFC 3450, Asynchronous Layered Coding protocol instantiation
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*
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* $Id$
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*
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2006-05-21 04:49:01 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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2005-01-14 11:17:35 +00:00
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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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2010-10-10 20:39:00 +00:00
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*
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2005-01-14 11:17:35 +00:00
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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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2010-10-10 20:39:00 +00:00
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*
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2005-01-14 11:17:35 +00:00
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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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2012-06-28 23:18:38 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2005-01-14 11:17:35 +00:00
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2005-01-14 11:17:35 +00:00
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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/prefs.h>
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#include "packet-rmt-alc.h"
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/* Initialize the protocol and registered fields */
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/* ============================================= */
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static int proto = -1;
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static struct _alc_hf hf;
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static struct _alc_ett ett;
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static struct _alc_prefs preferences;
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2010-10-10 20:39:00 +00:00
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static dissector_handle_t xml_handle;
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2008-01-30 22:34:17 +00:00
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2005-01-14 11:17:35 +00:00
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/* Preferences */
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/* =========== */
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/* Set/Reset preferences to default values */
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2010-01-19 23:51:27 +00:00
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static void alc_prefs_set_default(struct _alc_prefs *alc_prefs)
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2005-01-14 11:17:35 +00:00
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{
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2010-01-19 23:51:27 +00:00
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alc_prefs->use_default_udp_port = FALSE;
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alc_prefs->default_udp_port = 4001;
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2010-10-10 20:39:00 +00:00
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2010-01-19 23:51:27 +00:00
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lct_prefs_set_default(&alc_prefs->lct);
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fec_prefs_set_default(&alc_prefs->fec);
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2005-01-14 11:17:35 +00:00
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}
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/* Register preferences */
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2010-01-19 23:51:27 +00:00
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static void alc_prefs_register(struct _alc_prefs *alc_prefs, module_t *module)
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2005-01-14 11:17:35 +00:00
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{
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prefs_register_bool_preference(module,
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"default.udp_port.enabled",
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"Use default UDP port",
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"Whether that payload of UDP packets with a specific destination port should be automatically dissected as ALC packets",
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2010-01-19 23:51:27 +00:00
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&alc_prefs->use_default_udp_port);
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2005-01-14 11:17:35 +00:00
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prefs_register_uint_preference(module,
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"default.udp_port",
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"Default UDP destination port",
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"Specifies the UDP destination port for automatic dissection of ALC packets",
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2010-01-19 23:51:27 +00:00
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10, &alc_prefs->default_udp_port);
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2010-10-10 20:39:00 +00:00
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2010-01-19 23:51:27 +00:00
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lct_prefs_register(&alc_prefs->lct, module);
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fec_prefs_register(&alc_prefs->fec, module);
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2005-01-14 11:17:35 +00:00
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}
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/* Save preferences to alc_prefs_old */
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static void alc_prefs_save(struct _alc_prefs *p, struct _alc_prefs *p_old)
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{
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*p_old = *p;
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}
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/* Code to actually dissect the packets */
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/* ==================================== */
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static void dissect_alc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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/* Logical packet representation */
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struct _alc alc;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Offset for subpacket dissection */
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guint offset;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti;
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proto_tree *alc_tree;
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2008-01-30 22:34:17 +00:00
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/* Flute or not */
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tvbuff_t *new_tvb;
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gboolean is_flute = FALSE;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Structures and variables initialization */
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offset = 0;
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memset(&alc, 0, sizeof(struct _alc));
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Update packet info */
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pinfo->current_proto = "ALC";
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Make entries in Protocol column and Info column on summary display */
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2009-08-09 06:26:46 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ALC");
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2009-08-09 07:36:13 +00:00
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col_clear(pinfo->cinfo, COL_INFO);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* ALC header dissection */
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/* --------------------- */
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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alc.version = hi_nibble(tvb_get_guint8(tvb, offset));
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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if (tree)
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{
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/* Create subtree for the ALC protocol */
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2011-10-21 02:10:19 +00:00
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ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
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2005-01-14 11:17:35 +00:00
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alc_tree = proto_item_add_subtree(ti, ett.main);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Fill the ALC subtree */
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proto_tree_add_uint(alc_tree, hf.version, tvb, offset, 1, alc.version);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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} else
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alc_tree = NULL;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* This dissector supports only ALCv1 packets.
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* If alc.version > 1 print only version field and quit.
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*/
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if (alc.version == 1) {
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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struct _lct_ptr l;
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struct _fec_ptr f;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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l.lct = &alc.lct;
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l.hf = &hf.lct;
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l.ett = &ett.lct;
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l.prefs = &preferences.lct;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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f.fec = &alc.fec;
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f.hf = &hf.fec;
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f.ett = &ett.fec;
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f.prefs = &preferences.fec;
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* LCT header dissection */
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/* --------------------- */
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2010-10-10 20:39:00 +00:00
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2008-01-30 22:34:17 +00:00
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is_flute = lct_dissector(l, f, tvb, alc_tree, &offset);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* FEC header dissection */
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/* --------------------- */
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Only if it's present and if LCT dissector has determined FEC Encoding ID
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* FEC dissector should be called with fec->encoding_id* and fec->instance_id* filled
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*/
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if (alc.fec.encoding_id_present && tvb_length(tvb) > offset)
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fec_dissector(f, tvb, alc_tree, &offset);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Add the Payload item */
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2008-01-30 22:34:17 +00:00
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if (tvb_length(tvb) > offset){
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if(is_flute){
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2009-08-16 12:36:22 +00:00
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new_tvb = tvb_new_subset_remaining(tvb,offset);
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2008-01-30 22:34:17 +00:00
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call_dissector(xml_handle, new_tvb, pinfo, alc_tree);
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}else{
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proto_tree_add_none_format(alc_tree, hf.payload, tvb, offset, -1, "Payload (%u bytes)", tvb_length(tvb) - offset);
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}
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}
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Complete entry in Info column on summary display */
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/* ------------------------------------------------ */
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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lct_info_column(&alc.lct, pinfo);
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fec_info_column(&alc.fec, pinfo);
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}
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Free g_allocated memory */
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lct_dissector_free(&alc.lct);
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fec_dissector_free(&alc.fec);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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} else {
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if (tree)
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proto_tree_add_text(alc_tree, tvb, 0, -1, "Sorry, this dissector supports ALC version 1 only");
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Complete entry in Info column on summary display */
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO, "Version: %u (not supported)", alc.version);
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}
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}
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void proto_reg_handoff_alc(void)
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{
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static dissector_handle_t handle;
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2008-10-29 19:16:29 +00:00
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static gboolean preferences_initialized = FALSE;
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static struct _alc_prefs preferences_old;
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2005-01-14 11:17:35 +00:00
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if (!preferences_initialized)
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{
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2010-10-10 20:39:00 +00:00
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preferences_initialized = TRUE;
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2005-01-14 11:17:35 +00:00
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handle = create_dissector_handle(dissect_alc, proto);
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dissector_add_handle("udp.port", handle);
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2008-10-29 19:16:29 +00:00
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xml_handle = find_dissector("xml");
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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} else {
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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if (preferences_old.use_default_udp_port)
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2010-12-20 05:35:29 +00:00
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dissector_delete_uint("udp.port", preferences_old.default_udp_port, handle);
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2005-01-14 11:17:35 +00:00
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}
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if (preferences.use_default_udp_port)
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2010-12-20 05:35:29 +00:00
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dissector_add_uint("udp.port", preferences.default_udp_port, handle);
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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alc_prefs_save(&preferences, &preferences_old);
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2008-01-30 22:34:17 +00:00
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2005-01-14 11:17:35 +00:00
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}
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void proto_register_alc(void)
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2010-10-10 20:39:00 +00:00
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{
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2005-01-14 11:17:35 +00:00
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/* Setup ALC header fields */
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static hf_register_info hf_ptr[] = {
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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{ &hf.version,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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{ "Version", "alc.version", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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LCT_FIELD_ARRAY(hf.lct, "alc"),
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FEC_FIELD_ARRAY(hf.fec, "alc"),
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{ &hf.payload,
|
From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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{ "Payload", "alc.payload", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }}
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2005-01-14 11:17:35 +00:00
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};
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/* Setup protocol subtree array */
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static gint *ett_ptr[] = {
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&ett.main,
|
2010-10-10 20:39:00 +00:00
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|
2005-01-14 11:17:35 +00:00
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LCT_SUBTREE_ARRAY(ett.lct),
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FEC_SUBTREE_ARRAY(ett.fec)
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};
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module_t *module;
|
2010-10-10 20:39:00 +00:00
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2005-01-14 11:17:35 +00:00
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/* Clear hf and ett fields */
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memset(&hf, 0xff, sizeof(struct _alc_hf));
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memset(&ett, 0xff, sizeof(struct _alc_ett));
|
2010-10-10 20:39:00 +00:00
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|
2005-01-14 11:17:35 +00:00
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/* Register the protocol name and description */
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|
proto = proto_register_protocol("Asynchronous Layered Coding", "ALC", "alc");
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/* Register the header fields and subtrees used */
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|
proto_register_field_array(proto, hf_ptr, array_length(hf_ptr));
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|
|
proto_register_subtree_array(ett_ptr, array_length(ett_ptr));
|
2010-10-10 20:39:00 +00:00
|
|
|
|
2005-01-14 11:17:35 +00:00
|
|
|
/* Reset preferences */
|
|
|
|
alc_prefs_set_default(&preferences);
|
2010-10-10 20:39:00 +00:00
|
|
|
|
2005-01-14 11:17:35 +00:00
|
|
|
/* Register preferences */
|
|
|
|
module = prefs_register_protocol(proto, proto_reg_handoff_alc);
|
2008-01-30 22:34:17 +00:00
|
|
|
alc_prefs_register(&preferences, module);
|
|
|
|
|
2012-02-05 09:09:51 +00:00
|
|
|
register_dissector("alc", dissect_alc, proto);
|
2005-01-14 11:17:35 +00:00
|
|
|
}
|