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wireshark/packet-sual.c

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/* packet-sual.c
* Routines for SUA light, a Siemens propriatary protocol
*
* Copyright 2001, Martin Held <Martin.Held@icn.siemens.de>
* Michael Tüxen <Michael.Tuexen@icn.siemens.de>
*
* $Id: packet-sual.c,v 1.6 2001/06/18 02:17:53 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>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include "packet.h"
#define SUAL_PAYLOAD_PROTO_ID 4
#define VERSION_LENGTH 1
#define SPARE_1_LENGTH 1
#define MESSAGE_TYPE_LENGTH 2
#define SUBSYSTEM_NUMBER_LENGTH 2
#define SPARE_2_LENGTH 2
#define MESSAGE_LENGTH_LENGTH 4
#define COMMON_HEADER_LENGTH (VERSION_LENGTH + SPARE_1_LENGTH + MESSAGE_TYPE_LENGTH + \
SUBSYSTEM_NUMBER_LENGTH + SPARE_2_LENGTH + MESSAGE_LENGTH_LENGTH)
#define VERSION_OFFSET 0
#define SPARE_1_OFFSET (VERSION_OFFSET + VERSION_LENGTH)
#define MESSAGE_TYPE_OFFSET (SPARE_1_OFFSET + SPARE_1_LENGTH)
#define SUBSYSTEM_NUMBER_OFFSET (MESSAGE_TYPE_OFFSET + MESSAGE_TYPE_LENGTH)
#define SPARE_2_OFFSET (SUBSYSTEM_NUMBER_OFFSET + SUBSYSTEM_NUMBER_LENGTH)
#define MESSAGE_LENGTH_OFFSET (SPARE_2_OFFSET + SPARE_2_LENGTH)
/* SUAL message type coding */
#define SUAL_MSG_CLDT 0x0501
#define SUAL_MSG_CORE 0x0701
#define SUAL_MSG_COAK_CC 0x0702
#define SUAL_MSG_COAK_CREF 0x0712
#define SUAL_MSG_RELRE 0x0703
#define SUAL_MSG_RELCO 0x0704
#define SUAL_MSG_CODT 0x0707
#define SUAL_MSG_ERR 0x0000
static const value_string sual_message_type_values[] = {
{ SUAL_MSG_CLDT, "Connectionless Data Transfer (CLDT)"},
{ SUAL_MSG_CORE, "Connection Request (CORE)"},
{ SUAL_MSG_COAK_CC, "Connection Acknowledge (COAK_CC)"},
{ SUAL_MSG_COAK_CREF, "Connection Acknowledge (COAK_CREF)"},
{ SUAL_MSG_RELRE, "Release Request (RELRE)"},
{ SUAL_MSG_RELCO, "Release Complete (RELCO)"},
{ SUAL_MSG_CODT, "Connection Oriented Data Transfer (CODT)"},
{ SUAL_MSG_ERR, "Error (ERR)"},
{ 0, NULL}};
static const value_string sual_message_type_acro_values[] = {
{ SUAL_MSG_CLDT, "CLDT"},
{ SUAL_MSG_CORE, "CORE"},
{ SUAL_MSG_COAK_CC, "COAK_CC"},
{ SUAL_MSG_COAK_CREF, "COAK_CREF"},
{ SUAL_MSG_RELRE, "RELRE"},
{ SUAL_MSG_RELCO, "RELCO"},
{ SUAL_MSG_CODT, "CODT"},
{ SUAL_MSG_ERR, "ERR"},
{ 0, NULL}};
/* SUAL Error Codes */
#define SUAL_ERR_INVVERS 0x0001
#define SUAL_ERR_INVSTRID 0x0005
#define SUAL_ERR_INVMSGTYP 0x0006
static const value_string sual_error_code_values[] = {
{ SUAL_ERR_INVVERS, "Invalid Protocol Version"},
{ SUAL_ERR_INVSTRID, "Invalid Stream Identifier"},
{ SUAL_ERR_INVMSGTYP, "Invalid Message Type"},
{ 0, NULL}};
/* Initialize the protocol and registered fields */
static int proto_sual = -1;
static int hf_sual_version = -1;
static int hf_sual_spare_1 = -1;
static int hf_sual_message_type = -1;
static int hf_sual_subsystem_number = -1;
static int hf_sual_spare_2 = -1;
static int hf_sual_message_length = -1;
static int hf_sual_error_code = -1;
/* Initialize the subtree pointers */
static gint ett_sual = -1;
static dissector_table_t sual_dissector_table;
static void
dissect_sual_common_header(tvbuff_t *common_header_tvb, packet_info *pinfo,
proto_tree *sual_tree, guint16 *subsystem_number)
{
guint8 version, spare_1;
guint16 message_type, spare_2;
guint32 message_length;
/* Extract the common header */
version = tvb_get_guint8(common_header_tvb, VERSION_OFFSET);
spare_1 = tvb_get_guint8(common_header_tvb, SPARE_1_OFFSET);
message_type = tvb_get_ntohs(common_header_tvb, MESSAGE_TYPE_OFFSET);
*subsystem_number = tvb_get_ntohs(common_header_tvb, SUBSYSTEM_NUMBER_OFFSET);
spare_2 = tvb_get_ntohs(common_header_tvb, SPARE_2_OFFSET);
message_length = tvb_get_ntohl (common_header_tvb, MESSAGE_LENGTH_OFFSET);
if (check_col(pinfo->fd, COL_INFO)) {
col_append_str(pinfo->fd, COL_INFO, val_to_str(message_type, sual_message_type_acro_values, "Unknown"));
col_append_str(pinfo->fd, COL_INFO, " ");
};
if (sual_tree) {
/* add the components of the common header to the protocol tree */
proto_tree_add_uint(sual_tree, hf_sual_version,
common_header_tvb, VERSION_OFFSET, VERSION_LENGTH,
version);
proto_tree_add_uint(sual_tree, hf_sual_spare_1,
common_header_tvb, SPARE_1_OFFSET, SPARE_1_LENGTH,
spare_1);
proto_tree_add_uint_format(sual_tree, hf_sual_message_type,
common_header_tvb, MESSAGE_TYPE_OFFSET, MESSAGE_TYPE_LENGTH,
message_type, "Message type: %u (%s)",
message_type, val_to_str(message_type, sual_message_type_values, "Unknown"));
proto_tree_add_uint(sual_tree, hf_sual_subsystem_number,
common_header_tvb, SUBSYSTEM_NUMBER_OFFSET, SUBSYSTEM_NUMBER_LENGTH,
*subsystem_number);
proto_tree_add_uint(sual_tree, hf_sual_spare_2,
common_header_tvb, SPARE_2_OFFSET, SPARE_2_LENGTH,
spare_2);
proto_tree_add_uint(sual_tree, hf_sual_message_length,
common_header_tvb, MESSAGE_LENGTH_OFFSET, MESSAGE_LENGTH_LENGTH,
message_length);
};
}
static void
dissect_payload(tvbuff_t *payload_tvb, packet_info *pinfo,
guint16 subsystem_number, proto_tree *sual_tree, proto_tree *tree)
{
guint payload_length = tvb_length(payload_tvb);
/* do lookup with the subdissector table */
if ( ! dissector_try_port (sual_dissector_table, subsystem_number, payload_tvb,
pinfo, tree))
{
if (sual_tree) {
proto_tree_add_text(sual_tree, payload_tvb, 0, payload_length,
"Payload: %u byte%s",
payload_length,
plurality(payload_length, "", "s"));
}
}
}
static void
dissect_error_payload(tvbuff_t *payload_tvb, proto_tree *sual_tree)
{
if (sual_tree)
{
proto_tree_add_item(sual_tree, hf_sual_error_code, payload_tvb, 0, 2, FALSE);
}
}
static void
dissect_sual_message(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *sual_tree, proto_tree *tree)
{
gint offset, payload_length;
guint16 subsystem_number;
guint16 message_type;
tvbuff_t *common_header_tvb;
tvbuff_t *payload_tvb;
offset = 0;
/* extract and process the common header */
common_header_tvb = tvb_new_subset(message_tvb, offset, COMMON_HEADER_LENGTH, COMMON_HEADER_LENGTH);
message_type = tvb_get_ntohs(common_header_tvb, MESSAGE_TYPE_OFFSET);
dissect_sual_common_header(common_header_tvb, pinfo, sual_tree, &subsystem_number);
offset += COMMON_HEADER_LENGTH;
payload_length = tvb_length(message_tvb) - COMMON_HEADER_LENGTH;
if (payload_length != 0)
{
payload_tvb = tvb_new_subset(message_tvb, offset, payload_length, payload_length);
if (message_type != SUAL_MSG_ERR)
{
dissect_payload(payload_tvb, pinfo, subsystem_number, sual_tree, tree);
}
else
{
dissect_error_payload(payload_tvb, sual_tree);
}
}
}
static void
dissect_sual(tvbuff_t *message_tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *sual_item;
proto_tree *sual_tree;
/* make entry in the Protocol column on summary display */
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "SUAL");
/* In the interest of speed, if "tree" is NULL, don't do any work not
necessary to generate protocol tree items. */
if (tree) {
/* create the sual protocol tree */
sual_item = proto_tree_add_item(tree, proto_sual, message_tvb, 0, tvb_length(message_tvb), FALSE);
sual_tree = proto_item_add_subtree(sual_item, ett_sual);
} else {
sual_tree = NULL;
};
/* dissect the message */
dissect_sual_message(message_tvb, pinfo, sual_tree, tree);
}
/* Register the protocol with Ethereal */
void
proto_register_sual(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_sual_version,
{ "Version", "sual.version",
FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_spare_1,
{ "Spare", "sual.spare_1",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_message_type,
{ "Message Type", "sual.message_type",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_subsystem_number,
{ "Subsystem number", "sual.subsystem_number",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_spare_2,
{ "Spare", "sual.spare_2",
FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_message_length,
{ "Message length", "sual.message_length",
FT_UINT32, BASE_DEC, NULL, 0x0,
"", HFILL }
},
{ &hf_sual_error_code,
{ "Error Code", "sual.error_code",
FT_UINT16, BASE_HEX, VALS(&sual_error_code_values), 0x0,
"", HFILL }
}
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_sual,
};
/* Register the protocol name and description */
proto_sual = proto_register_protocol("SCCP user adaptation layer light",
"SUAL", "sual");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_sual, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* subdissector code */
sual_dissector_table = register_dissector_table("sual.subsystem_number");
};
void
proto_reg_handoff_sual(void)
{
dissector_add("sctp.ppi", SUAL_PAYLOAD_PROTO_ID, dissect_sual, proto_sual);
}
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