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wireshark/packet-mtp3.c

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/* packet-mtp3.c
* Routines for Message Transfer Part Level 3 dissection
* Copyright 2001, Michael Tuexen <Michael.Tuexen@icn.siemens.de>
*
* $Id: packet-mtp3.c,v 1.3 2001/05/31 08:51:29 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from README.developer
*
* 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>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#include "packet.h"
#include "prefs.h"
/* Initialize the protocol and registered fields */
static int proto_mtp3 = -1;
static module_t *mtp3_module;
static int hf_mtp3_service_indicator = -1;
static int hf_mtp3_network_indicator = -1;
static int hf_mtp3_spare = -1;
static int hf_mtp3_opc = -1;
static int hf_mtp3_dpc = -1;
static int hf_mtp3_sls = -1;
/* Initialize the subtree pointers */
static gint ett_mtp3 = -1;
static gint ett_mtp3_sio = -1;
static gint ett_mtp3_label = -1;
static dissector_table_t mtp3_sio_dissector_table;
#define ITU_STANDARD 1
#define ANSI_STANDARD 2
static gint mtp3_standard = ITU_STANDARD;
#define ITU_SIO_OFFSET 0
#define ITU_SIO_LENGTH 1
#define ITU_ROUTING_LABEL_OFFSET 1
#define ITU_ROUTING_LABEL_LENGTH 4
#define ITU_MTP_PAYLOAD_OFFSET 5
#define SERVICE_INDICATOR_MASK 0x0F
#define SPARE_MASK 0x30
#define NETWORK_INDICATOR_MASK 0xC0
#define DPC_MASK 0x00003FFF
#define OPC_MASK 0x0FFFC000
#define SLS_MASK 0xF0000000
static const value_string service_indicator_code_vals[] = {
{ 0x0, "Signalling network management message" },
{ 0x1, "Signalling network testing and maintenance message" },
{ 0x2, "Spare" },
{ 0x3, "SCCP" },
{ 0x4, "TUP" },
{ 0x5, "ISUP" },
{ 0x6, "DUP (call and circuit related messages)" },
{ 0x7, "DUP (facility registration and cancellation message)" },
{ 0x8, "MTP testing user part" },
{ 0x9, "Spare" },
{ 0xa, "Spare" },
{ 0xb, "Spare" },
{ 0xc, "Spare" },
{ 0xd, "Spare" },
{ 0xe, "Spare" },
{ 0xf, "Spare" },
{ 0, NULL }
};
static const value_string network_indicator_vals[] = {
{ 0x0, "International network" },
{ 0x1, "Spare (for international use only)" },
{ 0x2, "National network" },
{ 0x3, "Reserved for national use" },
{ 0, NULL }
};
static void
dissect_mtp3_sio(tvbuff_t *tvb, proto_tree *mtp3_tree)
{
guint8 sio;
proto_item *sio_item;
proto_tree *sio_tree;
sio_item = proto_tree_add_text(mtp3_tree, tvb, ITU_SIO_OFFSET, ITU_SIO_LENGTH, "Service information octet");
sio_tree = proto_item_add_subtree(sio_item, ett_mtp3_sio);
sio = tvb_get_guint8(tvb, ITU_SIO_OFFSET);
proto_tree_add_uint(sio_tree, hf_mtp3_network_indicator,
tvb, ITU_SIO_OFFSET, ITU_SIO_LENGTH,
sio);
proto_tree_add_uint(sio_tree, hf_mtp3_spare,
tvb, ITU_SIO_OFFSET, ITU_SIO_LENGTH,
sio);
proto_tree_add_uint(sio_tree, hf_mtp3_service_indicator,
tvb, ITU_SIO_OFFSET, ITU_SIO_LENGTH,
sio);
}
static void
dissect_mtp3_routing_label(tvbuff_t *tvb, proto_tree *mtp3_tree)
{
guint32 label;
proto_item *label_item;
proto_tree *label_tree;
label_item = proto_tree_add_text(mtp3_tree, tvb, ITU_ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH, "Routing label");
label_tree = proto_item_add_subtree(label_item, ett_mtp3_label);
label = tvb_get_letohl(tvb, ITU_ROUTING_LABEL_OFFSET);
proto_tree_add_uint(label_tree, hf_mtp3_dpc,
tvb, ITU_ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH,
label);
proto_tree_add_uint(label_tree, hf_mtp3_opc,
tvb, ITU_ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH,
label);
proto_tree_add_uint(label_tree, hf_mtp3_sls,
tvb, ITU_ROUTING_LABEL_OFFSET, ITU_ROUTING_LABEL_LENGTH,
label);
}
static void
dissect_mtp3_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 sio;
guint8 service_indicator;
tvbuff_t *payload_tvb;
sio = tvb_get_guint8(tvb, ITU_SIO_OFFSET);
service_indicator = sio & SERVICE_INDICATOR_MASK;
payload_tvb = tvb_new_subset(tvb, ITU_MTP_PAYLOAD_OFFSET, -1, -1);
if (!dissector_try_port(mtp3_sio_dissector_table, service_indicator, payload_tvb, pinfo, tree)) {
proto_tree_add_text(tree, payload_tvb, 0, tvb_length(payload_tvb),
"Payload (%u byte%s)",
tvb_length(payload_tvb), plurality(tvb_length(payload_tvb), "", "s"));
}
}
/* Code to actually dissect the packets */
static void
dissect_mtp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *mtp3_item;
proto_tree *mtp3_tree;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "MTP3");
if (check_col(pinfo->fd, COL_INFO))
col_clear(pinfo->fd, COL_INFO);
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create display subtree for the protocol */
mtp3_item = proto_tree_add_item(tree, proto_mtp3, tvb, 0, tvb_length(tvb), FALSE);
mtp3_tree = proto_item_add_subtree(mtp3_item, ett_mtp3);
/* dissect the packet */
dissect_mtp3_sio(tvb, mtp3_tree);
dissect_mtp3_routing_label(tvb, mtp3_tree);
dissect_mtp3_payload(tvb, pinfo, tree);
}
}
void
proto_register_mtp3(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_mtp3_service_indicator,
{ "Service indicator",
"mtp3.service_indicator",
FT_UINT8, BASE_HEX, VALS(service_indicator_code_vals), SERVICE_INDICATOR_MASK,
"" }},
{ &hf_mtp3_network_indicator,
{ "Network indicator",
"mtp3.network_indicator",
FT_UINT8, BASE_HEX, VALS(network_indicator_vals), NETWORK_INDICATOR_MASK,
"" }},
{ &hf_mtp3_spare,
{ "Spare",
"mtp3.spare",
FT_UINT8, BASE_HEX, NULL, SPARE_MASK,
"" }},
{ &hf_mtp3_opc,
{ "OPC",
"mtp3.opc",
FT_UINT32, BASE_DEC, NULL, OPC_MASK,
"" }},
{ &hf_mtp3_dpc,
{ "DPC",
"mtp3.dpc",
FT_UINT32, BASE_DEC, NULL, DPC_MASK,
"" }},
{ &hf_mtp3_sls,
{ "SLS",
"mtp3.sls",
FT_UINT32, BASE_DEC, NULL, SLS_MASK,
"" }},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_mtp3,
&ett_mtp3_sio,
&ett_mtp3_label
};
static enum_val_t mtp3_options[] = {
{"ITU", ITU_STANDARD},
/* {"ANSI", ANSI_STANDARD}, */
{NULL, 0}
};
/* Register the protocol name and description */
proto_mtp3 = proto_register_protocol("Message Transfer Part Level 3",
"MTP3", "mtp3");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_mtp3, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register the dissector */
register_dissector("mtp3", dissect_mtp3, proto_mtp3);
mtp3_sio_dissector_table = register_dissector_table("mtp3.service_indicator");
mtp3_module = prefs_register_protocol(proto_mtp3, NULL);
prefs_register_enum_preference(mtp3_module,
"mtp3_standard",
"MTP3 standard",
"MTP3 standard",
&mtp3_standard,
mtp3_options, FALSE);
}
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